E21B   1/00  \	0	0	2D129	E21B   1/00	720	׷⼰﹦Σ	Percussion drilling[2006.01]
E21B   1/02  \	1	1	2D129	E21B   1/02	120	ɥåץϥޡ㡥֥դΡѤϾǶưΡΣ	Surface drives for drop hammers, e.g. with a cable [1,7]
E21B   1/04  \	2	2	2D129	E21B   1/04	83	Ͼǥåɤޤϥ֥αưž뤿	Devices for reversing the movement of the rod or cable at the surface
E21B   1/12  \	1	1	2D129	E21B   1/12	71	ư򤹤׷ͭΡʣţ£ţ£ͥˡΣ	with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) [7]
E21B   1/14  \	2	2	2D129	E21B   1/14	46	žǶưΡΣ	driven by a rotating mechanism [7]
E21B   1/16  \	3	3	2D129	E21B   1/16	7	ץ󥰤դưΤͭΡ㡥åͭΡΣ	with spring-mounted reciprocating masses, e.g. with air cushion [7]
E21B   1/18  \	4	4	2D129	E21B   1/18	1	ư֤Υץå塦åɤؤΡŤδ˾ץץ󥰤ˤΤϢ֤ͭΡΣ	with elastic joining of the drive to the push-rod by double buffer springs [7]
E21B   1/20  \	3	3	2D129	E21B   1/20	11	ϥϥޡȤƹ줿ΡΣ	formed as centrifugal hammers [7]
E21B   1/22  \	2	2	2D129	E21B   1/22	16	żϤǶưΡΣ	driven by electromagnets [7]
E21B   1/24  \	2	2	2D129	E21B   1/24	14	׷बήΰϤľܶưԥȥǤΡΣ	the impulse member being a piston driven directly by fluid pressure [7]
E21B   1/26  \	3	3	2D129	E21B   1/26	305	ΰϤˤΡΣ	by liquid pressure [7]
E21B   1/28  \	4	4	2D129	E21B   1/28	14	ѥ륹ǺưΡΣ	working with pulses [7]
E21B   1/30  \	3	3	2D129	E21B   1/30	78	ޤϵΤΰϤˤΡΣ	by air, steam or gas pressure [7]
E21B   1/32  \	4	4	2D129	E21B   1/32	1	ѥ륹ǺưΡΣ	working with pulses [7]
E21B   1/34  \	5	5	2D129	E21B   1/34	48	׷बǳؤΥԥȥǤΡΣ	the impulse member being a piston of an internal-combustion engine [7]
E21B   1/36  \	1	1	2D129	E21B   1/36	15	ġ롦ꥢԥȥ󼰤ΤΡʤġ뤬׷³ƤΡΣ	Tool-carrier piston type, i.e. in which the tool is connected to an impulse member [7]
E21B   1/38  \	1	1	2D129	E21B   1/38	61	ϥޡԥȥ󼰤ΤΡʤġӥåȤޤϤʤȤ׷ˤäǷ⤵ΡΣ	Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member [7]
E21B   3/00  \	0	0	2D129	E21B   3/00	391	žΣ	Rotary drilling[2006.01]
E21B   3/02  \	1	1	2D129	E21B   3/02	111	ž﹦򤹤뤿ϾǶư	Surface drives for rotary drilling
E21B   3/02  A	1	0	2D129	E21B   3/02	187	ݥݥζư	Earth auger drives
E21B   3/02  B	1	0	2D129	E21B   3/02	108	ԥɥư	Spindle drives
E21B   3/02  Z	1	0	2D129	E21B   3/02	177	¾Τ	Others
E21B   3/025  \	2	2	2D129	E21B   3/025	72	ġ뤬˲žΡΣ	with a to-and-fro rotation of the tool [7]
E21B   3/03  \	2	2	2D129	E21B   3/03	8	ġ뤬³Ū˰βžԤΡΣ	with an intermittent unidirectional rotation of the tool [7]
E21B   3/035  \	2	2	2D129	E21B   3/035	78	ޤΤư֤ͭΡΣ	with slipping or elastic transmission [7]
E21B   3/04  \	2	2	2D129	E21B   3/04	134	ơ֥	Rotary tables
E21B   3/06  \	3	3	2D129	E21B   3/06	21	ơ֥ư뤳ȤŪȤɥŬѡΣ	Adaptation of rotary draw works to drive rotary tables[2006.01]
E21B   4/00  \	0	0	2D129	E21B   4/00	97	﹦ѤΤ˹ǶưΡΣ	Drives for drilling, used in the borehole [3]
E21B   4/02  \	1	1	2D129	E21B   4/02	58	ήΤˤžư֡Σ	Fluid rotary type drives[2006.01]
E21B   4/02  A	1	0	2D129	E21B   4/02	60	ݥܥɥ	Turbo-drills
E21B   4/02  B	1	1	2D129	E21B   4/02	61	ݥܥɥμ	Turbo-drill bearing devices
E21B   4/02  Z	1	0	2D129	E21B   4/02	26	¾Τ	Others
E21B   4/04  \	1	1	2D129	E21B   4/04	71	ŵˤư֡ʣţ£ͥˡΣ	Electric drives (E21B 4/12 takes precedence) [3]
E21B   4/06  \	1	1	2D129	E21B   4/06	123	ۡ뼰׷ʡ㡥ϥޡʥܡ󥰡ţ£ˡΣ	Down-hole impacting means, e.g. hammers (boring rams E21B 11/02)[2006.01]
E21B   4/08  \	2	2	2D129	E21B   4/08	13	ϤΤߤ׷ˤΡ㡥ȥ⡼ϢΣ	impact being obtained by gravity only, e.g. with lost-motion connection [3]
E21B   4/10  \	2	2	2D129	E21B   4/10	41	Ϣ³׷뼴ޤϥɥѥפϢ³ŪʰžưˤΡΣ	continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts [3]
E21B   4/12  \	2	2	2D129	E21B   4/12	7	ŵˤưϥޡΣ	Electrically operated hammers [3]
E21B   4/14  \	2	2	2D129	E21B   4/14	54	ήΤˤưϥޡΣ	Fluid operated hammers [3]
E21B   4/14  A	2	0	2D129	E21B   4/14	87	հˤ	by liquid pressures
E21B   4/14  B	2	0	2D129	E21B   4/14	220	ˤ	by pneumatic pressures
E21B   4/14  Z	2	0	2D129	E21B   4/14	13	¾Τ	Others
E21B   4/16  \	1	1	2D129	E21B   4/16	97	ʣΥۡ뼰ư֡㡥ž׷⼰﹦ѡʣţ£ͥˡ¿ΥӥåȤĺ﹦֤Τζư֡Σ	Plural down-hole drives, e.g. for combined percussion and rotary drilling (E21B 4/10 takes precedence); Drives for multi-bit drilling units [3]
E21B   4/18  \	1	1	2D129	E21B   4/18	80	˷αޤΡΣ	Anchoring or feeding in the borehole [3,7]
E21B   4/20  \	1	1	2D129	E21B   4/20	8	ϾζưʤȤ߹蘆줿Ρʣţ£ͥˡΣ	combined with surface drive (E21B 4/10 takes precedence) [3]
E21B   6/00  \	0	0	2D129	E21B   6/00	123	ž׷⼰﹦Ѷư֡Σ	Drives for drilling with combined rotary and percussive action [2006.01]
E21B   6/02  \	1	1	2D129	E21B   6/02	249	žϢ³ŪǤΡΣ	the rotation being continuous [7]
E21B   6/04  \	2	2	2D129	E21B   6/04	48	ư֤׷ѤȲžѤ̤ˤʤäƤΡΣ	Separate drives for percussion and rotation [7]
E21B   6/06  \	1	1	2D129	E21B   6/06	14	ž³ŪʤΡ㡥ߤ֤ˤΡΣ	the rotation being intermittent, e.g. obtained by a ratchet device [7]
E21B   6/08  \	2	2	2D129	E21B   6/08	4	ư֤׷ѤȲžѤ̤ˤʤäƤΡΣ	Separate drives for percussion and rotation [7]
E21B   7/00  \	0	0	2D129	E21B   7/00	51	﹦ѤΤüˡޤ֡Σ	Special methods or apparatus for drilling [2006.01]
E21B   7/00  E	0	0	2D129	E21B   7/00	294	ñΤΡ¿ΤΣţƣ	Earth augers (of single axis; of multi-spindle augers E02F 5/02)
E21B   7/00  A	0	1	2D129	E21B   7/00	867	﹦ѥݥݥ	Earth augers for drilling shaft holes
E21B   7/00  B	0	1	2D129	E21B   7/00	332	﹦ѥݥݥ	Earth augers for digging pole holes
E21B   7/00  C	0	1	2D129	E21B   7/00	168	դ﹦ѥݥݥ	Earth augers for drilling planting holes
E21B   7/00  Z	0	0	2D129	E21B   7/00	606	¾Τ	Others
E21B   7/02  \	1	1	2D129	E21B   7/02	1465	ΦμʤħΤ﹦㡥åɤޤϼؤͤ줿ΡΣ	Drilling rigs characterised by means for land transport, e.g. skid mounting or wheel mounting [2006.01]
E21B   7/04  \	1	1	2D129	E21B   7/04	40	з	Directional drilling
E21B   7/04  A	1	0	2D129	E21B   7/04	481	ʿ﹦	Horizontal drilling rigs
E21B   7/04  Z	1	0	2D129	E21B   7/04	142	¾Τ	Others
E21B   7/06  \	2	2	2D129	E21B   7/06	73	򷹼Ф	Deflecting the direction of boreholes
E21B   7/08  \	3	3	2D129	E21B   7/08	78	ܡ󥰤򷹼Ф뤿ü֡㡥üʥɥӥåȡʥå른祤ȡۥåץȥåΣ	Special apparatus for deflecting the boring, e.g. special drill bits, knuckle joints or whipstocks [2006.01]
E21B   7/10  \	2	2	2D129	E21B   7/10	84	Фν	Correction of deflected boreholes
E21B   7/12  \	1	1	2D129	E21B   7/12	126	﹦ʾ岼ư֤ѤΣţ£ˡΣ	Underwater drilling  (using heave compensators E21B 19/09) [2006.01]
E21B   7/124  \	2	2	2D129	E21B   7/124	100	ưˤư湩ˤΡ㡥ǻѤ¼﹦֡Σ	with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors [3]
E21B   7/128  \	2	2	2D129	E21B   7/128	25	˸ꤵ줿äΩͷٻ椫ԤΡΣ	from floating support with independent underwater anchored guide base [3]
E21B   7/132  \	2	2	2D129	E21B   7/132	84	ͷٻ椫ԤΡΣ	from underwater buoyant support [3]
E21B   7/136  \	2	2	2D129	E21B   7/136	56	ͷƤʤٻ椫ԤΡʣţ£ͥˡΣ	from non-buoyant support (E21B 7/124 takes precedence) [3]
E21B   7/14  \	1	1	2D129	E21B   7/14	77	ǮѤ﹦㡥б﹦	Drilling by use of heat, e.g. flame drilling
E21B   7/15  \	2	2	2D129	E21B   7/15	36	ŵŪǮˤΡΣ	of electrically generated heat [3]
E21B   7/16  \	1	1	2D129	E21B   7/16	37	ɥΰϤˤäơФФʵޤϾ򲡤ĤΡʤåȥɥ	Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling
E21B   7/18  \	1	1	2D129	E21B   7/18	532	Ѥ뤫ϻѤʤΤޤϥåȤˤ﹦ʣţ£ͥˡΣ	Drilling by liquid or gas jets, with or without entrained pellets (E21B 7/14 takes precedence) [2006.01]
E21B   7/20  \	1	1	2D129	E21B   7/20	1188	ؤΥ󥰤ޤϴɤǤߤޤϲߡ㡥ߡ﹦ȥ󥰤֤Ʊ˹ԤΡΣ	Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes [2006.01]
E21B   7/24  \	1	1	2D129	E21B   7/24	80	ưʡ㡥ʿ׽ſѤ﹦ʾ׷⼰﹦ţ£ˡΣ	Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B 1/00) [3]
E21B   7/26  \	1	1	2D129	E21B   7/26	274	ڤʤǹԤ﹦㡥ʿʼ﹦֤ˤ롤ʣţ£ͥˡΣ	Drilling without earth removal, e.g. with self-propelled burrowing devices (E21B 7/30 takes precedence) [2006.01]
E21B   7/28  \	1	1	2D129	E21B   7/28	206	﹦γȷ㡥߲ˤΣ	Enlarging drilled holes, e.g. by counterboring [2006.01]
E21B   7/30  \	2	2	2D129	E21B   7/30	12	ڤʤΡΣ	without earth removal [6]
E21B  10/00  \	0	0	2D129	E21B  10/00	159	ɥӥåȡʺ﹦򷹼Ф뤿̤ѤΣţ£ʪ򽸤뤿μʤͭΣţ£ˡΣ	Drill bits (specially adapted for deflecting the direction of boring E21B 7/08; with means for collecting substances E21B 27/00) [3,8]
E21B  10/00  A	0	0	2D129	E21B  10/00	70	󥰥ɥӥĥ	Wing drill bits
E21B  10/00  B	0	0	2D129	E21B  10/00	77	ϥޡݥɥӥĥ	Hammer drill bits
E21B  10/00  C	0	0	2D129	E21B  10/00	54	󥫹ѥɥӥĥ	Drill bits for anchor holes
E21B  10/00  Z	0	0	2D129	E21B  10/00	114	¾Τ	Others
E21B  10/02  \	1	1	2D129	E21B  10/02	310	ӥåȡʬˤäħŤ줿Σţ£ˡΣ	Core bits  (characterised by wear resisting parts E21B 10/48) [2006.01]
E21B  10/04  \	2	2	2D129	E21B  10/04	6	˲ʤĤΡΣ	with core destroying means [3]
E21B  10/06  \	2	2	2D129	E21B  10/06	9	ӥåȡΣ	Roller core bits [3]
E21B  10/08  \	1	1	2D129	E21B  10/08	65	ɥӥåȡʣţ£ͥ表ӥåȣţ£ʬˤäħŤ줿Σţ£ˡΣ	Roller bits  (E21B 10/26 takes precedence; roller core bits E21B 10/06;  characterised by wear resisting parts E21B 10/50) [2006.01]
E21B  10/10  \	2	2	2D129	E21B  10/10	58	ξü˻ٻ줿鼴ĤΡΣ	with roller axle supported at both ends [2006.01]
E21B  10/12  \	2	2	2D129	E21B  10/12	57	ǥåĤΡΣ	with disc cutters [3]
E21B  10/14  \	2	2	2D129	E21B  10/14	0	ƳʬͭʳΤΤǲžʤåȤ߹碌ΡΣ	combined with non-rolling cutters other than of leading-portion type [3]
E21B  10/16  \	2	2	2D129	E21B  10/16	74	ηޤˤäħŤ줿ΡΣ	characterised by tooth form or arrangement [3]
E21B  10/18  \	2	2	2D129	E21B  10/18	70	﹦ήΤΤƳϩޤϥΥˤäħŤ줿ΡΣ	characterised by conduits or nozzles for drilling fluids [2006.01]
E21B  10/20  \	2	2	2D129	E21B  10/20	12	ʬΥǽޤĴǽʬ㡥ޤϼˤäħŤ줿ΡΣ	characterised by detachable or adjustable parts, e.g. legs or axles [2006.01]
E21B  10/22  \	2	2	2D129	E21B  10/22	107	ޤϥκˤäħŤ줿ΡΣ	characterised by bearing, lubrication or sealing details [3,8]
E21B  10/23  \	3	3	2D129	E21B  10/23	0	ؤκ﹦ήΤζȼΡΣ	with drilling fluid supply to the bearings [8]
E21B  10/24  \	3	3	2D129	E21B  10/24	18	κˤäħŤ줿Ρʣţ£ͥˡΣ	characterised by lubricating details (E21B 10/23 takes precedence) [3,8]
E21B  10/25  \	3	3	2D129	E21B  10/25	3	κˤäħŤ줿ΡΣ	characterised by sealing details [8]
E21B  10/26  \	1	1	2D129	E21B  10/26	146	Ƴʬĥɥӥåȡʤѥåȥåĥɥӥåȡȷ뤿Υɥӥåȡ㡥꡼ޡƳʬľ׷⼰ɥӥåȣţ£ˡΣ	Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B 10/40) [2006.01]
E21B  10/28  \	2	2	2D129	E21B  10/28	6	ʤ饫åĤΡΣ	with non-expansible roller cutters [3]
E21B  10/30  \	3	3	2D129	E21B  10/30	7	ļ꡼ޡ㡥꡼ޥӥ饤Σ	Longitudinal axis roller reamers, e.g. reamer stabilisers [3]
E21B  10/32  \	2	2	2D129	E21B  10/32	862	϶ĤΡΣ	with expansible cutting tools [3]
E21B  10/34  \	3	3	2D129	E21B  10/34	28	饫åΤΡΣ	of roller-cutter type [3]
E21B  10/36  \	1	1	2D129	E21B  10/36	412	׷⼰ɥӥåȡʬˤäħŤ줿Σţ£ˡΣ	Percussion drill bits (characterised by wear resisting parts E21B 10/46) [3]
E21B  10/38  \	2	2	2D129	E21B  10/38	97	﹦ήΤΤƳϩޤϥΥˤäħŤ줿ΡΣ	characterised by conduits or nozzles for drilling fluids [3]
E21B  10/40  \	2	2	2D129	E21B  10/40	66	ƳʬĤΡΣ	with leading portion [3]
E21B  10/42  \	1	1	2D129	E21B  10/42	55	֥졼ɡޤڤǤΤ褦ʤΡ㡥եӥåȡӥåȡĲžɥӥåȡʬˤäħŤ줿Σţ£﹦ήΤΤƳϩޤϥΥˤäħŤ줿Σţ£ʬΥǽڤǤˤäħŤ줿Σţ£ˡΣ	Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits (characterised by wear resisting parts E21B 10/46, by conduits or nozzles for drilling fluid E21B 10/60, by detachable parts E21B 10/62) [3,8]
E21B  10/43  \	2	2	2D129	E21B  10/43	11	ڿϤޤϤ¾ڤǤ֤ˤäħŤ줿ΡΣ	characterised by the arrangement of teeth or other cutting elements [8]
E21B  10/44  \	1	1	2D129	E21B  10/44	595	餻αʬĥӥåɡ㡥塼ӥåȡƳʬĤޤʬΥǽʬĥʣţ£ͥˡΣ	Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts (E21B 10/42 takes precedence) [2006.01]
E21B  10/46  \	1	1	2D129	E21B  10/46	400	ʬ㡥ɤΥ󥵡ȡˤäħŤ줿ΡΣ	characterised by wear resisting parts, e.g. diamond inserts [3]
E21B  10/48  \	2	2	2D129	E21B  10/48	106	ΤΡΣ	the bit being of core type [3]
E21B  10/50  \	2	2	2D129	E21B  10/50	34	ΤΡΣ	the bit being of roller type [3]
E21B  10/52  \	3	3	2D129	E21B  10/52	111	ޤϥܥΥ󥵡ȤĤΡΣ	with chisel- or button-type inserts [3]
E21B  10/54  \	2	2	2D129	E21B  10/54	10	žɥӥåȡ㡥եӥåȡΣ	the bit being of the rotary drag type, e.g. fork-type bits [3,8]
E21B  10/55  \	3	3	2D129	E21B  10/55	0	ͽŪڤǤͭΡΣ	with preformed cutting elements [2006.01]
E21B  10/56  \	2	2	2D129	E21B  10/56	131	ܥΥ󥵡ȡʣţ£ͥˡΣ	Button-type inserts (E21B 10/52 takes precedence) [3]
E21B  10/567  \	3	3	2D129	E21B  10/567	3	ۤʤٻΤ˿Ĥ줿ͽŪڤǤͭΡ㡥¿뾽Υ󥵡ȡΣ	with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts [8]
E21B  10/573  \	4	4	2D129	E21B  10/573	5	ٻΤκˤäħդΡ㡥¤ޤϴڤǤȤܹΣ	characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element [8]
E21B  10/58  \	2	2	2D129	E21B  10/58	61	Υ󥵡ȡʣţ£ͥˡΣ	Chisel-type inserts (E21B 10/52 takes precedence) [2006.01]
E21B  10/60  \	1	1	2D129	E21B  10/60	181	﹦ήΤΤƳϩޤϥΥˤäħŤ줿Ρʥɥӥåѣţ£׷⼰ɥӥåѣţ£ˡΣ	characterised by conduits or nozzles for drilling fluids (for roller bits E21B 10/18; for percussion drill bits E21B 10/38) [3]
E21B  10/61  \	2	2	2D129	E21B  10/61	2	Υι¤ˤäħդΡΣ	characterised by nozzle structure [8]
E21B  10/62  \	1	1	2D129	E21B  10/62	163	ʬΥǽޤĴǽʡ㡥ڤǤˤäħŤ줿Ρʣţ£ͥ表ɥӥåѣţ£ѣţ£ˡΣ	characterised by parts, e.g. cutting elements, which are detachable or adjustable (E21B 10/64 takes precedence; for roller bits E21B 10/20; for augers E21B 10/44) [3,8]
E21B  10/627  \	2	2	2D129	E21B  10/627	4	ʣʬΥǽڤǤͭΡΣ	with plural detachable cutting elements [8]
E21B  10/633  \	3	3	2D129	E21B  10/633	4	ñȤʬΥǽʤΡΣ	independently detachable [8]
E21B  10/64  \	1	1	2D129	E21B  10/64	43	ؤǽޤϹ椫ǽΤޤϰʬˤäħŤ줿ΡΣ	characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe [2006.01]
E21B  10/66  \	2	2	2D129	E21B  10/66	9	ɥѥưǽǲذưǽڤǤĤΡΣ	the cutting element being movable through the drilling pipe and laterally shiftable [3]
E21B  11/00  \	0	0	2D129	E21B  11/00	80	¾κ﹦ѹ	Other drilling tools
E21B  11/00  A	0	0	2D129	E21B  11/00	338	ܡݥ󥰥Хĥ	Boring buckets
E21B  11/00  B	0	0	2D129	E21B  11/00	171	ȷ¿Ϥͭܡݥ󥰥Хĥ	Boring buckets with expansible blades
E21B  11/00  C	0	0	2D129	E21B  11/00	69	ܡݥ󥰥ХĥȤ	Soil removing devices for boring buckets
E21B  11/00  Z	0	0	2D129	E21B  11/00	115	¾Τ	Others
E21B  11/02  \	1	1	2D129	E21B  11/02	48	ܡ󥰡Σ	Boring rams [2006.01]
E21B  11/04  \	1	1	2D129	E21B  11/04	289	ܡ󥰡	Boring grabs
E21B  11/06  \	1	1	2D129	E21B  11/06	15	åƥ󥰥ޤζưѤ	with driven cutting chains or similarly-driven tools
E21B  12/00  \	0	0	2D129	E21B  12/00	91	﹦ѹΤ°Σ	Accessories for drilling tools [3]
E21B  12/02  \	1	1	2D129	E21B  12/02	39	ɽ֡Σ	Wear indicators [3]
E21B  12/04  \	1	1	2D129	E21B  12/04	3	ɥӥåݸ֡Σ	Drill bit protectors [3]
E21B  12/06  \	1	1	2D129	E21B  12/06	243	Ū֡Σ	Mechanical cleaning devices [3]
E21B  15/00  \	0	0	2D129	E21B  15/00	643	﹦λٻΡ㡥Ϧʤ䤰ˡޥȡΣ	Supports for the drilling machine, e.g. derricks or masts [1,7]
E21B  15/02  \	1	1	2D129	E21B  15/02	156	﹦äŬ礷Ρʣţ£ͥˡΣ	specially adapted for underwater drilling (E21B 15/04 takes precedence) [2006.01]
E21B  15/04  \	1	1	2D129	E21B  15/04	70	зäŬ礷Ρ㡥йѺ﹦֡Σ	specially adapted for directional drilling, e.g. slant hole rigs [3]
E21B  17/00  \	0	0	2D129	E21B  17/00	281	ɥåɤޤϥѥסߥɥ륹ȥ󥰡꡼ɥ륫顼ååɡ󥰡塼ӥ󥰡Σ	Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings [2006.01]
E21B  17/01  \	1	1	2D129	E21B  17/01	177	饤Σ	Risers [2006.01]
E21B  17/02  \	1	1	2D129	E21B  17/02	148	åץ󥰡祤	Couplings; Joints
E21B  17/03  \	2	2	2D129	E21B  17/03	89	ɥåɤޤϥѥפȥɥ롦⡼Ȥδ֤ΤΡ㡥ɥåɤȥϥޡδ֤ΤΡΣ	between drilling rod or pipe and drill motor, e.g. between drilling rod and hammer [7]
E21B  17/04  \	2	2	2D129	E21B  17/04	183	åɤȥӥåȤδ֤ΤΡޤϥåɤȥåɤδ֤Τ	between rod and bit, or between rod and rod
E21B  17/042  \	3	3	2D129	E21B  17/042	430	ͤڤΤ	threaded
E21B  17/043  \	4	4	2D129	E21B  17/043	28	ݤʤä	with locking means
E21B  17/046  \	3	3	2D129	E21B  17/046	109	֡ԥޤϥ硼­Ūʹ¤ޤΤΡ㡥Хͥåȥå㡤Ĥ	with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
E21B  17/05  \	3	3	2D129	E21B  17/05	113	٥른祤	Swivel joints
E21B  17/06  \	3	3	2D129	E21B  17/06	9	꡼󥰥祤ȡ㡥եƥ祤	Releasing-joints, e.g. safety joints
E21B  17/07  \	3	3	2D129	E21B  17/07	164	ɥ륹ȥ󥰤ĹѤ뤿ο̷Ѽꡨ˾֡Σ	Telescoping joints for varying drill string lengths; Shock absorbers [2006.01]
E21B  17/08  \	2	2	2D129	E21B  17/08	114	󥰥祤	Casing joints
E21B  17/10  \	1	1	2D129	E21B  17/10	225	ץƥȥ饤Σ	Wear protectors; Centralising devices [2006.01]
E21B  17/12  \	2	2	2D129	E21B  17/12	1	ץƥμդޤϼϤ	Devices for placing or drawing out wear protectors
E21B  17/14  \	1	1	2D129	E21B  17/14	79	󥰥塼	Casing shoes
E21B  17/16  \	1	1	2D129	E21B  17/16	39	ɥ륫顼Σ	Drill collars [3]
E21B  17/18  \	1	1	2D129	E21B  17/18	91	ʣήϩĥѥסΣ	Pipes provided with plural fluid passages [2006.01]
E21B  17/20  \	1	1	2D129	E21B  17/20	39	߼ޤʬἰΥɥѥסΣ	Flexible or articulated drilling pipes [3]
E21B  17/22  \	1	1	2D129	E21B  17/22	247	餻¤ĥåɤޤϥѥסΣ	Rods or pipes with helical structure [2006.01]
E21B  19/00  \	0	0	2D129	E21B  19/00	141	γ㡥ϦΤ褦ʥåɡ󥰡塼֤ޤΤΤåɤޤϥ֥뤿֡Σ	Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables [2006.01]
E21B  19/02  \	1	1	2D129	E21B  19/02	134	åɤޤϥ֥η֡Σ	Rod or cable suspensions [2006.01]
E21B  19/04  \	2	2	2D129	E21B  19/04	14	եå	Hooks
E21B  19/06  \	2	2	2D129	E21B  19/06	134	١ʤåɤޤϥ塼֤Ĥ	Elevators, i.e. rod- or tube-gripping devices
E21B  19/07  \	3	3	2D129	E21B  19/07	6	å׷١Σ	Slip-type elevators [2006.01]
E21B  19/08  \	1	1	2D129	E21B  19/08	525	åɤޤϥ֥֡ʣţ£ͥ表ưţ£ˡ﹦ѹؤΰϤ뤿֡åɤν̤Ĥꤢ碌뤿֡Σ	Apparatus for feeding the rods or cables (E21B 19/22 takes precedence; automatic feed E21B 44/02); Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods [2006.01]
E21B  19/081  \	2	2	2D129	E21B  19/081	19	ͤȥʥåȤ굡Σ	Screw-and-nut feed mechanisms [7]
E21B  19/083  \	2	2	2D129	E21B  19/083	13	ࡤåޤΤΤ굡Σ	Cam, rack or like feed mechanisms [7]
E21B  19/084  \	2	2	2D129	E21B  19/084	74	Τĥʡ㡥֥ͭΡΣ	with flexible drawing means, e.g. cables [7]
E21B  19/086  \	2	2	2D129	E21B  19/086	262	ΤǶư륷ĤΡʣţ£ţ£ţ£ͥˡΣ	with a fluid-actuated cylinder (E21B 19/084, E21B 19/087, E21B 19/09 take precedence) [7]
E21B  19/087  \	2	2	2D129	E21B  19/087	105	ɤ륢ʤˤΡΣ	by means of a swinging arm [7]
E21B  19/089  \	2	2	2D129	E21B  19/089	5	ץ󥰤ޤɲòٽŤͭΡΣ	with a spring or an additional weight [7]
E21B  19/09  \	2	2	2D129	E21B  19/09	43	ɥ륹ȥ󥰤ٻ岼ư֤ٻ椫ο﹦äŬ礷ΡΣ	specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string [2006.01]
E21B  19/10  \	1	1	2D129	E21B  19/10	17	åסѥ	Slips; Spiders
E21B  19/12  \	1	1	2D129	E21B  19/12	3	פĤ߶Σ	Rope clamps [2006.01]
E21B  19/14  \	1	1	2D129	E21B  19/14	157	åɤܤΤޤ³ĹݤĤΥåסȥդ뤤ϥӥݴɾȹȤδ֤ʣţ£ţ£ͥˡΣ	Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole (E21B 19/20, E21B 19/22 take precedence) [3]
E21B  19/15  \	2	2	2D129	E21B  19/15	72	ʿ֤ǤΥåɤΥå󥰡ʿȿľΰ֤δ֤ǤΣ	Racking of rods in horizontal position; Handling between horizontal and vertical position [3]
E21B  19/16  \	1	1	2D129	E21B  19/16	216	ѥץåץ󥰤ޤϥ祤ȤΤϤϤʣţ£ͥˡΣ	Connecting or disconnecting pipe couplings or joints (E21B 19/20 takes precedence) [2006.01]
E21B  19/18  \	1	1	2D129	E21B  19/18	113	ɥӥåȤޤϥɥѥפΤϤϤΣ	Connecting or disconnecting drill bit and drilling pipe [3]
E21B  19/20  \	1	1	2D129	E21B  19/20	112	å³ȤȤ߹碌줿Ρ㡥ưŪ˹ԤʤΡΣ	Combined feeding from rack and connecting, e.g. automatically [3]
E21B  19/22  \	1	1	2D129	E21B  19/22	23	줿ѥפޤϥåɤ㡥ߥɥѥסΣ	Handling reeled pipe or rod units, e.g. flexible drilling pipes [3]
E21B  19/24  \	1	1	2D129	E21B  19/24	288	ɥåɤޤϥѥѤΥ֤ޤϥȥ饤֡Σ	Guiding or centralising devices for drilling rods or pipes [7]
E21B  21/00  \	0	0	2D129	E21B  21/00	526	ϿФӽФ뤿ˡޤ֡㡥⡼ӵѤΡʹ˸夷ʪΤζţ£ˡΣ	Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B 31/03) [2006.01]
E21B  21/00  A	0	0	2D129	E21B  21/00	261	﹦ť	Muddy water for drilling holes
E21B  21/00  Z	0	0	2D129	E21B  21/00	71	¾Τ	Others
E21B  21/01  \	1	1	2D129	E21B  21/01	20	γǺ﹦ήΤ⤷Ϻ﹦򰷤֡㡥ťȢΣ	Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes [2006.01]
E21B  21/015  \	2	2	2D129	E21B  21/015	3	﹦˴ؤʡ㡥ѥաɡΣ	Means engaging the bore entrance, e.g. hoods for collecting dust [7]
E21B  21/02  \	1	1	2D129	E21B  21/02	24	ۡΥ٥른祤	Swivel joints in hose lines
E21B  21/06  \	1	1	2D129	E21B  21/06	203	γǺ﹦ήΤ뤿֡Σ	Arrangements for treating drilling fluids outside the borehole [2006.01]
E21B  21/07  \	2	2	2D129	E21B  21/07	5	кΥήΤ뤿ΤΡΣ	for treating dust-laden gaseous fluids [7]
E21B  21/08  \	1	1	2D129	E21B  21/08	63	﹦ήΤΰϤޤήޤϴƻ롤㡥μư찵ϤμưʤΤ֣ţ£ˡΣ	Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E21B 21/10) [3]
E21B  21/10  \	1	1	2D129	E21B  21/10	21	﹦ήΤν۴ĥƥˤ֡Σ	Valves arrangements in drilling-fluid circulation systems [2006.01]
E21B  21/12  \	1	1	2D129	E21B  21/12	24	ʣήϩĥɥѥפλѤˤΡ㡥Ľ۴ĥƥΣ	using drilling pipes with plural fluid passages, e.g. closed circulation systems [2006.01]
E21B  21/14  \	1	1	2D129	E21B  21/14	64	ΤȵΤѤΡ㡥ˢΣ	using liquids and gases, e.g. foams [3]
E21B  21/16  \	1	1	2D129	E21B  21/16	5	ήΤѤΡʣţ£ͥˡΣ	using gaseous fluids (E21B 21/14 takes precedence) [2006.01]
E21B  21/18  \	1	1	2D129	E21B  21/18	0	ɥ롦⡼Фӵ̤˿᤭դΤɤΡΣ	Preventing exhaust air from the drill motor from blowing-off towards the working face [7]
E21B  23/00  \	0	0	2D129	E21B  23/00	62	ޤϰͤǹ񡤥ѥåޤϤΤΤִ֡ꡤޤϰư뤿֡ʥ󥰡꡼󡤤ޤϥ饤ʡ֤Σţ£ˡΣ	Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells  (setting of casings, screens or liners E21B 43/10) [2006.01]
E21B  23/01  \	1	1	2D129	E21B  23/01	13	ޤϤΤΤθѡʣţ£ţ£ͥ表ζư֤θţ£ˡΣ	for anchoring the tools or the like (E21B 23/02-E21B 23/06 take precedence; anchoring of drives in the borehole E21B 4/18) [6]
E21B  23/02  \	1	1	2D129	E21B  23/02	3	դ˥åץˤޤϥ塼ӥ󥰤ʬ֤α˹ޤϤΤΤꤹ뤿ΤΡʣţ£ţ£ͥˡΣ	for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing (E21B 23/03-E21B 23/06 take precedence) [3]
E21B  23/03  \	1	1	2D129	E21B  23/03	18	¦껦褦˿Ĥ줿˥åץޤϤܤߤع֤뤿ΤΡޤϤ餫鹩ư뤿ΤΡΣ	for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets [3]
E21B  23/04  \	1	1	2D129	E21B  23/04	7	ήμʤˤäƺưΡ㡥ȯˤưΡʣţ£ͥˡΣ	operated by fluid means, e.g. actuated by explosion  (E21B 23/08 takes precedence) [2006.01]
E21B  23/06  \	1	1	2D129	E21B  23/06	27	ѥå֤뤳Ȥ˴ؤ	for setting packers
E21B  23/08  \	1	1	2D129	E21B  23/08	6	ήΰˤäƹƳޤԤΡ㡥롼ե饤󹩶񥷥ƥΣ	Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems [2006.01]
E21B  23/10  \	2	2	2D129	E21B  23/10	2	äŬ礷Σ	Tools specially adapted therefor [3]
E21B  23/12  \	2	2	2D129	E21B  23/12	4	žΡΣ	Tool diverters [3]
E21B  23/14  \	1	1	2D129	E21B  23/14	2	֥ޤϥ֥빩ִѡ㡥Фͤˤ븡ؤޤϺ﹦ѡΣ	for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells [2006.01]
E21B  25/00  \	0	0	2D129	E21B  25/00	497	𤵤ʤμ褢뤤ϼФ֡㡥С롤ȴʥӥåȣţ£ˡΣ	Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors  (core bits E21B 10/02) [2006.01]
E21B  25/02  \	1	1	2D129	E21B  25/02	54	ɥѥפ夲뤳Ȥʤ˹ǽʤޤϹ椫ǽʥ쥷СΣ	the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe [2006.01]
E21B  25/04  \	2	2	2D129	E21B  25/04	101	ѤΥåƥ󥰥åޤǤĥ쥷С㡥ѥСΣ	the core receiver having a core forming cutting edge or element, e.g. punch type core barrels [3]
E21B  25/06  \	1	1	2D129	E21B  25/06	19	ߤ䤹饤ʡޤĥǽݻʤĥ쥷СΣ	the core receiver having a flexible liner or inflatable retaining means [3]
E21B  25/08  \	1	1	2D129	E21B  25/08	36	ʤ롤ǲʣţ£ͥˡʤޤϰǤΥβΣ	Coating, freezing, consolidating cores (E21B 25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure [3]
E21B  25/10  \	1	1	2D129	E21B  25/10	47	ݻޤǤʤ줿Ρʣţ£ţ£ͥˡΣ	Formed core retaining or severing means (E21B 25/06, E21B 25/08 take precedence) [3]
E21B  25/12  \	2	2	2D129	E21B  25/12	3	ưӷΤΡΣ	of the sliding wedge type [3]
E21B  25/14  \	2	2	2D129	E21B  25/14	0	μФƲμͤ줿ΡΣ	mounted on pivot transverse to core axis [3]
E21B  25/16  \	1	1	2D129	E21B  25/16	28	Τ狼륳뤿ΤΡΣ	for obtaining oriented cores [3]
E21B  25/18  \	1	1	2D129	E21B  25/18	33	ǤäŬ礷쥷СΣ	the core receiver being specially adapted for operation under water [3]
E21B  27/00  \	0	0	2D129	E21B  27/00	38	ޤϰͤˤʪޤݻ뤿ƴ㡥ťޤϺ뤿Υ٥顼ʪ뤿μʤͭɥӥåȡ㡥դɥӥåȡΣ	Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits [6,8]
E21B  27/02  \	1	1	2D129	E21B  27/02	7	ץ٥顼ʤȤޤϻʤɤʪݻѤƴΣ	Dump bailers, i.e. containers for depositing substances, e.g. cement or acids [6,8]
E21B  27/04  \	1	1	2D129	E21B  27/04	1	ޤݻʤ餻α¼ʤޤΡΣ	where the collecting or depositing means include helical conveying means [8]
E21B  28/00  \	0	0	2D129	E21B  28/00	3	ޤϰѤοưȯ֡㡥ɷѡʷ¬ãѣţ£ϵʪŪ¬ѣǣ֣ˡΣ	Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (for transmitting measuring-signals E21B 47/14; for geophysical measurements G01V 1/02) [2006.01]
E21B  29/00  \	0	0	2D129	E21B  29/00	34	ޤϰ֤ͤ줿ѥסѥåץ饰ޤϥ磻饤Ǥޤ˲㡥»ѥסǡޤϰͤǤΥѥפѷǤΰͥ󥰤νΣ	Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground [2006.01]
E21B  29/02  \	1	1	2D129	E21B  29/02	11	ȯޤǮŪޤϲŪʤˤΡΣ	by explosives or by thermal or chemical means [2006.01]
E21B  29/04  \	1	1	2D129	E21B  29/04	5	磻饤ޤϤΤΤǡʣţ£ͥˡΣ	Cutting of wire lines or the like (E21B 29/02 takes precedence) [3]
E21B  29/06  \	1	1	2D129	E21B  29/06	2	ǡ㡥ۥåץȥåΤη륫åʣţ£ͥˡΣ	Cutting windows, e.g. directional window cutters for whipstock operations (E21B 29/08 takes precedence)[2006.01]
E21B  29/08  \	1	1	2D129	E21B  29/08	13	ήΤή椹뤿ΥѥפǤޤѷΣ	Cutting or deforming pipes to control fluid flow [2006.01]
E21B  29/10  \	1	1	2D129	E21B  29/10	17	ͥ󥰤ν㡥ޤäˤ뤳ȡΣ	Reconditioning of well casings, e.g. straightening [3]
E21B  29/12  \	1	1	2D129	E21B  29/12	0	äŬ礷Ρʣţ£ͥˡΣ	specially adapted for underwater installations (E21B 29/08 takes precedence) [3]
E21B  31/00  \	0	0	2D129	E21B  31/00	30	ޤϰͤǤʪΤκȤޤϼΣ	Fishing for or freeing objects in boreholes or wells [2006.01]
E21B  31/03  \	1	1	2D129	E21B  31/03	20	ˤΣ	Freeing by flushing [3]
E21B  31/06  \	1	1	2D129	E21B  31/06	2	ФμʤѤΡΣ	using magnetic means [3]
E21B  31/08  \	1	1	2D129	E21B  31/08	3	󥯥ХåȤޤϤΤΤѤΡΣ	using junk baskets or the like [3]
E21B  31/107  \	1	1	2D129	E21B  31/107	15	夷ʤ뤿ξ׷ʤѤΡ㡥㡼Σ	using impact means for releasing stuck parts, e.g. jars [2006.01]
E21B  31/113  \	2	2	2D129	E21B  31/113	4	尵ǺưΡΣ	hydraulically operated [3]
E21B  31/12  \	1	1	2D129	E21B  31/12	6	ªѹ㡥ȥ󥰤ޤϥ	Grappling tools, e.g. tongs or grabs
E21B  31/14  \	2	2	2D129	E21B  31/14	2	Ф餻ʤĤΡ㡥ʥå른祤ȤλѤˤΡΣ	with means deflecting the direction of the tool, e.g. by use of knuckle joints [2006.01]
E21B  31/16  \	2	2	2D129	E21B  31/16	38	Ǥޤ˲ʤȤ߹蘆줿ΡΣ	combined with cutting or destroying means [2006.01]
E21B  31/18  \	2	2	2D129	E21B  31/18	10	¦ĻΡ㡥СåȡΣ	gripping externally, e.g. overshot [3]
E21B  31/20  \	2	2	2D129	E21B  31/20	13	¦ĻΡ㡥եå󥰥ڥΣ	gripping internally, e.g. fishing spears [3]
E21B  33/00  \	0	0	2D129	E21B  33/00	17	ޤϰ̩ͤޤϥѥå	Sealing or packing boreholes or wells
E21B  33/02  \	1	1	2D129	E21B  33/02	28	ɽǤ̩ޤϥѥå	Surface sealing or packing
E21B  33/03  \	2	2	2D129	E21B  33/03	43	֡ΤȤΩơΣ	Well heads; Setting-up thereof [2006.01]
E21B  33/035  \	3	3	2D129	E21B  33/035	62	äŬ礷Ρʣţ£ţ£ţ£ͥˡΣ	specially adapted for underwater installations (E21B 33/043, E21B 33/064, E21B 33/076 take precedence) [3]
E21B  33/037  \	4	4	2D129	E21B  33/037	12	Τݸϥ󥰡Σ	Protective housings therefor [3]
E21B  33/038  \	4	4	2D129	E21B  33/038	57	֤˻Ѥ륳ͥ㡥ʮɻ֤ȥ饤Ϣ뤹뤿ΤΡΣ	Connectors used on well heads, e.g. for connecting blow-out preventer and riser [2006.01]
E21B  33/04  \	3	3	2D129	E21B  33/04	69	󥰥إåɡǤΥ󥰤ޤϥ塼ӥ󥰤η͡Σ	Casing heads; Suspending casings or tubings in well heads [2006.01]
E21B  33/043  \	4	4	2D129	E21B  33/043	23	湣֤äŬ礷Ρʣţ£ͥˡΣ	specially adapted for underwater well heads (E21B 33/047 takes precedence) [3]
E21B  33/047  \	4	4	2D129	E21B  33/047	9	ʣΥ塼ӥ󥰥ȥ󥰤ΤΤΡΣ	for plural tubing strings [3]
E21B  33/05  \	4	4	2D129	E21B  33/05	4	󥰥إåɡ㡥󥰥ץ饰뤿Ĥ	Cementing-heads, e.g. having provision for introducing cementing plugs
E21B  33/06  \	3	3	2D129	E21B  33/06	102	ʮɻ֡Σ	Blow-out preventers [3]
E21B  33/064  \	4	4	2D129	E21B  33/064	24	湣֤äŬ礷ΡΣ	specially adapted for underwater well heads [2006.01]
E21B  33/068  \	3	3	2D129	E21B  33/068	13	ʪΤޤʪΤͤƳ뤿Ρޤϰͤ뤿ĤΡʥ󥰥إåɣţ£ˡΣ	having provision for introducing objects or fluids into, or removing objects from, wells (cementing-heads E21B 33/05) [3]
E21B  33/072  \	4	4	2D129	E21B  33/072	0	֥빩ΤΤΡʣţ£ͥˡΣ	for cable-operated tools (E21B 33/076 takes precedence) [3]
E21B  33/076  \	4	4	2D129	E21B  33/076	2	äŬ礷ΡΣ	specially adapted for underwater installations [3]
E21B  33/08  \	2	2	2D129	E21B  33/08	2	磻ѡ륻С	Wipers; Oil savers
E21B  33/10  \	1	1	2D129	E21B  33/10	21	Τ	in the borehole
E21B  33/12  \	2	2	2D129	E21B  33/12	154	ѥåץ饰ʥ󥰤ΤѤΣţ£ţ£	Packers; Plugs (used for cementing E21B 33/134, E21B 33/16)
E21B  33/122  \	3	3	2D129	E21B  33/122	11	¿ʥȥ󥰥ѥå	Multiple-string packers
E21B  33/124  \	3	3	2D129	E21B  33/124	8	֤ξʬΥ뤿˽ΰʬ˥ץ饰ߤ˥å	Units with longitudinally-spaced plugs for isolating the intermediate space
E21B  33/126  \	3	3	2D129	E21B  33/126	20	ήΰǺưΥåפޤϥȤĤΡʣţ£ţ£ͥ	with fluid-pressure-operated elastic cup or skirt (E21B 33/122, E21B 33/124 take precedence)
E21B  33/127  \	3	3	2D129	E21B  33/127	39	դॹ꡼֤ĤΡʣţ£ţ£ͥ	with inflatable sleeve (E21B 33/122, E21B 33/124 take precedence)
E21B  33/128  \	3	3	2D129	E21B  33/128	47	ΰϤˤäȾĥĤΡʣţ£ţ£ͥ	with a member expanded radially by axial pressure (E21B 33/122, E21B 33/124 take precedence)
E21B  33/129  \	3	3	2D129	E21B  33/129	15	ǡǰóݤ뤿εŪåפäΡʣţ£ţ£ͥ	with mechanical slips for hooking into the casing (E21B 33/122, E21B 33/124 take precedence)
E21B  33/1295  \	4	4	2D129	E21B  33/1295	2	ήΰǺưΡΣ	actuated by fluid pressure [6]
E21B  33/13  \	2	2	2D129	E21B  33/13	152	ꡤܤޤϤΤΤդΥ󥰤ˡޤ֡Σ	Methods or devices for cementing, for plugging holes, crevices or the like [2006.01]
E21B  33/134  \	3	3	2D129	E21B  33/134	2	֥åץ饰	Bridging plugs
E21B  33/136  \	3	3	2D129	E21B  33/136	1	Хåȡ㡥Τ	Baskets, e.g. of umbrella type
E21B  33/138  \	3	3	2D129	E21B  33/138	23	ɤؤ	Plastering the borehole wall; Injecting into the formation
E21B  33/14  \	3	3	2D129	E21B  33/14	49	˥󥰤򥻥󥰤뤿Τ	for cementing casings into boreholes
E21B  33/16  \	4	4	2D129	E21B  33/16	8	ʬʬ뤿Υץ饰ѤΡΤΥץ饰	using plugs for isolating cement charge; Plugs therefor
E21B  34/00  \	0	0	2D129	E21B  34/00	13	ޤϰͤΤ֡Σ	Valve arrangements for boreholes or wells [2006.01]
E21B  34/02  \	1	1	2D129	E21B  34/02	11	֤ˤΡΣ	in well heads [3]
E21B  34/04  \	2	2	2D129	E21B  34/04	12	湣֤ˤΡΣ	in underwater well heads [3]
E21B  34/06  \	1	1	2D129	E21B  34/06	8	ͤˤΡΣ	in wells [3]
E21B  34/08  \	2	2	2D129	E21B  34/08	19	μ褵줿ήΤήޤϰϤ˱Ρʣţ£ͥˡΣ	responsive to flow or pressure of the fluid obtained (E21B 34/10 takes precedence) [3]
E21B  34/10  \	2	2	2D129	E21B  34/10	14	γ鶡뤵ήΤˤΡΣ	operated by control fluid supplied from outside the borehole [2006.01]
E21B  34/12  \	2	2	2D129	E21B  34/12	14	󥰤ޤϥ塼ӥ󥰤ưˤΡΣ	operated by movement of casings or tubings [3]
E21B  34/14  \	2	2	2D129	E21B  34/14	3	ưˤΡ㡥ԥȥޤϥ磻饤󹩶ˤä륹꡼֥Х֡Σ	operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools [3]
E21B  34/16  \	1	1	2D129	E21B  34/16	3	ΤʤγˤΡΣ	Control means therefor being outside the borehole [3]
E21B  35/00  \	0	0	2D129	E21B  35/00	20	ɲФޤϾòФΤˡޤ֡Σ	Methods or apparatus for preventing or extinguishing fires [2006.01]
E21B  36/00  \	0	0	2D129	E21B  36/00	17	ޤϰͤΤβǮѡΥ֡㡥ʵӤǻѤ뤿ΤΡΣ	Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones [2006.01]
E21B  36/02  \	1	1	2D129	E21B  36/02	3	СʡѤΡΣ	using burners [3]
E21B  36/04  \	1	1	2D129	E21B  36/04	23	ŵŪҡѤΡΣ	using electrical heaters [3]
E21B  37/00  \	0	0	2D129	E21B  37/00	53	ޤϰͤݤΤˡޤ֡ʣţ£ͥˡΣ	Methods or apparatus for cleaning boreholes or wells (E21B 21/00 takes precedence) [2006.01]
E21B  37/02  \	1	1	2D129	E21B  37/02	10	äˤŬ礷쥤	Scrapers specially adapted therefor
E21B  37/04  \	2	2	2D129	E21B  37/04	5	ήΰˤΡ㡥ե꡼ԥȥ󥹥쥤ѡΣ	operated by fluid pressure, e.g. free-piston scrapers [2006.01]
E21B  37/06  \	1	1	2D129	E21B  37/06	27	ѥեޤƱͤʪΤѤɻߤޤ¤ŪȤ벽ŪʤѤΡΣ	using chemical means for preventing or limiting the deposition of paraffins or like substances [2006.01]
E21B  37/08  \	1	1	2D129	E21B  37/08	17	Υե륿꡼󡤤ޤϺŶΤ򸽾ݤΡʣţ£ͥˡΣ	cleaning <u>in situ</u> of down-hole filters, screens, or gravel packs (E21B 37/06 takes precedence) [3]
E21B  37/10  \	1	1	2D129	E21B  37/10	1	ѥå֡Σ	Well swabs [3]
E21B  40/00  \	0	0	2D129	E21B  40/00	5	塼ӥ󥰥å㡨ưŪͤΥ塼ӥߤ	Tubing catchers, automatically arresting the fall of oil-well tubing
E21B  41/00  \	0	0	2D129	E21B  41/00	20	롼ףţ£ţ£ˤäƥСʤޤϺ	Equipment or details not covered by groups E21B 15/00-E21B 40/00
E21B  41/02  \	1	1	2D129	E21B  41/02	9	ޤϰˤƸ忩ΡΣ	in situ inhibition of corrosion in boreholes or wells [2006.01]
E21B  41/04  \	1	1	2D129	E21B  41/04	8	ΤΥޥ˥ץ졼㡥֤˰ŪϢ뤵ΡΣ	Manipulators for underwater operations, e.g. temporarily connected to well heads [2006.01]
E21B  41/06  \	1	1	2D129	E21B  41/06	5	Τκȼ㡥֤ˡŪϢ뤵ΡΣ	Work chambers for underwater operations, e.g. temporarily connected to well heads [2006.01]
E21B  41/08  \	1	1	2D129	E21B  41/08	1	Υɡ١㡥﹦ƥץ졼ȡΤο¬̡Σ	Underwater guide bases, e.g. drilling templates; Levelling thereof [7]
E21B  41/10  \	1	1	2D129	E21B  41/10	4	ɡݥȡ㡥곰ΤǤΡΥɡ١ؤΥμդΣ	Guide posts, e.g. releasable; Attaching guide lines to underwater guide bases [7]
E21B  43/00  \	0	0	2D129	E21B  43/00	119	椫塤ϲޤͻʪޤϹʪηդμ褹뤿ˡޤ֡ʿФƤΤŬѤǤΣţ¡ˡΣ	Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B) [2006.01]
E21B  43/00  A	0	0	2D129	E21B  43/00	291	˴ؤ	Related to gases
E21B  43/00  B	0	0	2D129	E21B  43/00	256	塤˴ؤ	Related to water or spring water
E21B  43/00  C	0	0	2D129	E21B  43/00	223	Ǯ˴ؤ	Related to geothermal energy
E21B  43/00  Z	0	0	2D129	E21B  43/00	227	¾Τ	Others
E21B  43/01  \	1	1	2D129	E21B  43/01	217	κμäŬ礷ΡΣ	specially adapted for obtaining from underwater installations [2006.01]
E21B  43/013  \	2	2	2D129	E21B  43/013	101	湣֤ػХե饤Ϣ뤹ΡΣ	Connecting a production flow line to an underwater well head [3]
E21B  43/017  \	2	2	2D129	E21B  43/017	21	ѥƥ饤ȥơ󡤤ʤơϢ뤵줿¿Υƥ饤ȹ֤ʤΣ	Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station [2006.01]
E21B  43/02  \	1	1	2D129	E21B  43/02	9	ڤΤΣ	Subsoil filtering [2006.01]
E21B  43/04  \	2	2	2D129	E21B  43/04	4	ͤƤ󤷤	Gravelling of wells
E21B  43/08  \	2	2	2D129	E21B  43/08	72	꡼ޤϥ饤	Screens or liners
E21B  43/10  \	2	2	2D129	E21B  43/10	86	ͤ˥󥰡꡼ޤϥ饤ʡ֤ΡΣ	Setting of casings, screens or liners in wells [2006.01]
E21B  43/11  \	1	1	2D129	E21B  43/11	14	ꤢѡߥ	Perforators; Permeators
E21B  43/112  \	2	2	2D129	E21B  43/112	3	Ȥꤦꤢäꤢ㡥ήμʤˤäƺư	Perforators with extendable perforating members, e.g. actuated by fluid means
E21B  43/114  \	2	2	2D129	E21B  43/114	8	ľܡήΤκѡ㡥亽ΥåȡѤꤢ	Perforators using direct fluid action, e.g. abrasive jets
E21B  43/116  \	2	2	2D129	E21B  43/116	17	ƴݤޤꤢ	Gun or shaped-charge perforators
E21B  43/117  \	3	3	2D129	E21B  43/117	18	ꤢʣţ£ͥ	Shaped-charge perforators (E21B 43/118 takes precedence)
E21B  43/118  \	3	3	2D129	E21B  43/118	3	ľΰ֤ǹߤƤҤĤŤѰ֤˷뤳ȤħȤ	characterised by lowering in vertical position and subsequent tilting to operating position
E21B  43/1185  \	3	3	2D129	E21B  43/1185	7	ХƥΣ	Ignition systems [3]
E21B  43/119  \	2	2	2D129	E21B  43/119	1	㡥ꤢޤ뤿Τ	Details, e.g. for locating perforating place or direction
E21B  43/12  \	1	1	2D129	E21B  43/12	71	μ褵줿ήΤήΰͤؤΤޤϰǤԤˡޤ֡ʣţ£ͥ表֣ţ£	Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B 43/25 takes precedence; valve arrangements E21B 34/00)
E21B  43/14  \	1	1	2D129	E21B  43/14	22	¿ؤκμ	Obtaining from a multiple-zone well
E21B  43/16  \	1	1	2D129	E21B  43/16	137	úǤμ褹뤿ζˡΣ	Enhanced recovery methods for obtaining hydrocarbons [2006.01]
E21B  43/17  \	2	2	2D129	E21B  43/17	3	ĤޤϤʾΰͤե饯󥰤ޤؤ򹶤¾ˡˤϢ뤹뤳ȤˤΡʣţ£ͥˡΣ	Interconnecting two or more wells by fracturing or otherwise attacking the formation (E21B 43/247 takes precedence) [3]
E21B  43/18  \	2	2	2D129	E21B  43/18	9	ƲðޤϿˡ	Repressuring or vacuum methods
E21B  43/20  \	2	2	2D129	E21B  43/20	19	并ˡ	Displacing by water
E21B  43/22  \	2	2	2D129	E21B  43/22	41	ʤޤϥХƥꥢκѤѤΡʣţ£ͥˡΣ	Use of chemicals or bacterial activity (E21B 43/27 takes precedence) [2006.01]
E21B  43/22  A	2	0	2D129	E21B  43/22	181	ʤ˴ؤ	Related to chemicals
E21B  43/22  B	2	0	2D129	E21B  43/22	30	Хƥꥢ˴ؤ	Related to bacteria
E21B  43/22  Z	2	0	2D129	E21B  43/22	2	¾Τ	Others
E21B  43/24  \	2	2	2D129	E21B  43/24	142	ǮȤΡ㡥Σ	using heat, e.g. steam injection [2006.01]
E21B  43/241  \	3	3	2D129	E21B  43/241	2	úǤǤʤʪϲιۤȹ碌Ρ㡥ǴϲǮʬΣ	combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale [5]
E21B  43/243  \	3	3	2D129	E21B  43/243	63	ǳƤΡΣ	Combustion <u>in situ</u> [3]
E21B  43/247  \	4	4	2D129	E21B  43/247	1	ե饯󥰤μ˴ϢΡΣ	in association with fracturing processes [3]
E21B  43/248  \	5	5	2D129	E21B  43/248	2	ȯʪѤΡΣ	using explosives [5]
E21B  43/25  \	1	1	2D129	E21B  43/25	10	ɷ㤹뤳Ȥˤ껺ФˡΣ	Methods for stimulating production [2006.01]
E21B  43/26  \	2	2	2D129	E21B  43/26	111	ܤޤϳܤ뤳Ȥˤ	by forming crevices or fractures
E21B  43/263  \	3	3	2D129	E21B  43/263	5	ȯʪѤΡΣ	using explosives [3]
E21B  43/267  \	3	3	2D129	E21B  43/267	41	٤뤳Ȥˤܤ䶯ΡΣ	reinforcing fractures by propping [3]
E21B  43/27  \	3	3	2D129	E21B  43/27	14	忩Τβʡ㡥λѤˤ	by use of eroding chemicals, e.g. acids
E21B  43/28  \	1	1	2D129	E21B  43/28	19	úǰʳιʪϲ㡥륫ޤϻοкޤˤΡʣţ£ͥˡΣ	Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E21B 43/241 takes precedence) [5]
E21B  43/285  \	1	1	2D129	E21B  43/285	1	ʪͻ㡥βʣţ£ͥˡΣ	Melting minerals, e.g. sulfur (E21B 43/24 takes precedence) [2006.01]
E21B  43/29  \	1	1	2D129	E21B  43/29	6	ʪηդκμ衤㡥ΥλѤˤΡΣ	Obtaining a slurry of minerals, e.g. by using nozzles [5]
E21B  43/295  \	1	1	2D129	E21B  43/295	18	ʪΥ㡥ǳκʪΤΤΡΣ	Gasification of minerals, e.g. for producing mixtures of combustible gases (E21B 43/243 takes precedence) [5]
E21B  43/30  \	1	1	2D129	E21B  43/30	7	̤ͤΥѥ㡥ͤΥڡ󥰤ŬˤΡΣ	Specific pattern of wells, e.g. optimising the spacing of wells [2006.01]
E21B  43/32  \	1	1	2D129	E21B  43/32	0	ޤϿα߿ݡʤͤμϤǤΥޤϿα߿ηɻߡΣ	Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells [3]
E21B  43/34  \	1	1	2D129	E21B  43/34	63	ͤˤ껺Ф줿ʪʬΥΤ֡Σ	Arrangements for separating materials produced by the well [2006.01]
E21B  43/36  \	2	2	2D129	E21B  43/36	13	ʬΥ֡ʣţ£ͥˡΣ	Underwater separating arrangements (E21B 43/38 takes precedence) [3]
E21B  43/38  \	2	2	2D129	E21B  43/38	6	ͤˤΡΣ	in the well [3]
E21B  43/40  \	2	2	2D129	E21B  43/40	22	ʬΥʪκ˴ϢʬΥѤΡΣ	Separation associated with re-injection of separated materials [3]
E21B  44/00  \	0	0	2D129	E21B  44/00	108	﹦äŬư楷ƥࡤʤžԤβߤʤ˺﹦Ԥޤ뤿˵ǽ뼫ƥࡤ㡥ԥ塼ˤ椵﹦ƥࡨ¿κ﹦ѿޤϾδƻäŬƥΣ	Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems ; Systems specially adapted for monitoring a plurality of drilling variables or conditions [2006.01]
E21B  44/00  A	0	0	2D129	E21B  44/00	221	﹦ưʣͥ	Automatic hole drilling control (E21B 44/02 to E21B 44/10 take precedence)
E21B  44/00  Z	0	0	2D129	E21B  44/00	127	¾Τ	Others
E21B  44/02  \	1	1	2D129	E21B  44/02	115	ġμưʣţ£ͥˡΣ	Automatic control of the tool feed (E21B 44/10 takes precedence) [7]
E21B  44/04  \	2	2	2D129	E21B  44/04	34	ư֤Υȥ륯˱ΡΣ	in response to the torque of the drive [7]
E21B  44/06  \	2	2	2D129	E21B  44/06	50	ư֤βưήΤήޤϰϤ˱ΡΣ	in response to the flow or pressure of the motive fluid of the drive [7]
E21B  44/08  \	2	2	2D129	E21B  44/08	19	׷ġư㡥פޤȿư礭˱ΡΣ	in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil [7]
E21B  44/10  \	1	1	2D129	E21B  44/10	0	̤ġ뤬夲줿μư֡Σ	Arrangements for automatic stopping when the tool is lifted from the working face [7]
E21B  45/00  \	0	0	2D129	E21B  45/00	39	﹦֤ȷ®٤¬	Measuring the drilling time or rate of penetration
E21B  47/00  \	0	0	2D129	E21B  47/00	198	ޤϰͤĴʺ﹦ήΤΰϤޤήδƻ룲ˡΣ	Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E21B 21/08) [1,2012.01]
E21B  47/001  \	1	1	2D129	E21B  47/001	10	ѡΣ	for underwater installations [2012.01]
E21B  47/002  \	1	1	2D129	E21B  47/002	28	ܻ븡ˤΡΣ	by visual inspection [2012.01]
E21B  47/003  \	1	1	2D129	E21B  47/003	0	ͤޤϹѤꤹΡΣ	Determining well or borehole volumes [2012.01]
E21B  47/005  \	1	1	2D129	E21B  47/005	2	ȸǲʼޤϥ٥δƻޤϸΣ	Monitoring or checking of cementation quality or level [2012.01]
E21B  47/007  \	1	1	2D129	E21B  47/007	3	ѥץȥ󥰤ޤϥ󥰤αϤ¬ʸ夷ʬΥѥפõΤ٤ΤΣţ£ˡΣ	Measuring stresses in a pipe string or casing (for locating blocked portions of pipes E21B 47/09) [2012.01]
E21B  47/008  \	1	1	2D129	E21B  47/008	6	ۡݥץƥδƻ롤㡥֥ݥץա׾֤θФΤΤΡΣ	Monitoring of down-hole pump systems, e.g. for the detection of &quot;pumped-off&quot; conditions [2012.01]
E21B  47/009  \	2	2	2D129	E21B  47/009	0	󥰥ӡݥץƥδƻΣ	Monitoring of walking-beam pump systems [2012.01]
E21B  47/01  \	1	1	2D129	E21B  47/01	40	ɥӥåȡѥסåɤޤϥ磻䡼饤¬֤ٻ뤿֡¬֤Ǯ׷⡤ϤޤϤΤΤݸΡΣ	Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like [6,2012.01]
E21B  47/013  \	2	2	2D129	E21B  47/013	5	ɥӥåȤ¬֤ٻ뤿äŬ礷֡Σ	Devices specially adapted for supporting measuring instruments on drill bits [2012.01]
E21B  47/017  \	2	2	2D129	E21B  47/017	7	¬֤ݸΣ	Protecting measuring instruments [2012.01]
E21B  47/02  \	1	1	2D129	E21B  47/02	84	Ф̤η	Determining slope or direction
E21B  47/022  \	2	2	2D129	E21B  47/022	86	Ρ㡥ϼѤΡΣ	of the borehole, e.g. using geomagnetism [1,2012.01]
E21B  47/0224  \	3	3	2D129	E21B  47/0224	8	Ͽ̤ޤϲʤѤΡΣ	using seismic or acoustic means [2012.01]
E21B  47/0228  \	3	3	2D129	E21B  47/0228	9	żͥ륮ޤϤΤθдѤΡΣ	using electromagnetic energy or detectors therefor [2012.01]
E21B  47/0232  \	4	4	2D129	E21B  47/0232	1	ʤȤ⥨ͥ륮ΣĤޤϤθдΣĤɽ̤ޤϤ֤ΡΣ	at least one of the energy sources or one of the detectors being located on or above the ground surface [2012.01]
E21B  47/0236  \	3	3	2D129	E21B  47/0236	8	ҤѤΡΣ	using a pendulum [2012.01]
E21B  47/024  \	2	2	2D129	E21B  47/024	75	֤ΤΡʹηФ̤ηţ£ˡΣ	of devices in the borehole  (determining slope or direction of the borehole E21B 47/022) [2006.01]
E21B  47/026  \	2	2	2D129	E21B  47/026	11	ؤΤΤ	of penetrated ground layers
E21B  47/04  \	1	1	2D129	E21B  47/04	96	ޤϱհ̤¬Σ	Measuring depth or liquid level [1,2012.01]
E21B  47/047  \	2	2	2D129	E21B  47/047	27	հ̡ޡѤޤϱհ̤¬ţ£ˡΣ	Liquid level  (measuring depth or liquid level using radioactive markers E21B 47/053) [2012.01]
E21B  47/053  \	2	2	2D129	E21B  47/053	0	ޡѤΡΣ	using radioactive markers [2012.01]
E21B  47/06  \	1	1	2D129	E21B  47/06	88	٤ޤϰϤ¬Σ	Measuring temperature or pressure [1,2012.01]
E21B  47/07  \	2	2	2D129	E21B  47/07	8	١Σ	Temperature [2012.01]
E21B  47/08  \	1	1	2D129	E21B  47/08	47	ľ¤ޤϴϢˡ¬Σ	Measuring diameters or related dimensions at the borehole [1,2012.01]
E21B  47/085  \	2	2	2D129	E21B  47/085	20	ռͼʤѤΡ㡥żΣ	using radiant means, e.g. acoustic, radioactive or electromagnetic [2012.01]
E21B  47/09  \	1	1	2D129	E21B  47/09	31	ޤϰʪΤΰ֤ޤϷꡨѥפμͳʤޤĺɤ줿ʬμ̡Σ	Locating or determining the position of objects in boreholes or wells; Identifying the free or blocked portions of pipes [3,2012.01]
E21B  47/092  \	2	2	2D129	E21B  47/092	0	۾ʬۤθФˤΡΣ	by detecting magnetic anomalies [2012.01]
E21B  47/095  \	2	2	2D129	E21B  47/095	0	۾θΤˤΡ㡥ں̮ưѡΣ	by detecting acoustic anomalies, e.g. using mud-pressure pulses [2012.01]
E21B  47/098  \	2	2	2D129	E21B  47/098	1	ѥåѤΡ㡥ؤߤޤϷθΡΣ	using impression packers, e.g. to detect recesses or perforations [2012.01]
E21B  47/10  \	1	1	2D129	E21B  47/10	48	ήΤϳСޤϰưõΡΣ	Locating fluid leaks, intrusions or movements [1,2012.01]
E21B  47/103  \	2	2	2D129	E21B  47/103	1	Ǯ¬ѤΡΣ	using thermal measurements [2012.01]
E21B  47/107  \	2	2	2D129	E21B  47/107	2	ʤѤΡΣ	using acoustic means [2012.01]
E21B  47/11  \	2	2	2D129	E21B  47/11	5	ȥ졼ѤΡǽѤΡΣ	using tracers; using radioactivity [2012.01]
E21B  47/113  \	2	2	2D129	E21B  47/113	1	ŵɽѤΡѤΡΣ	using electrical indications; using light radiation [2012.01]
E21B  47/117  \	2	2	2D129	E21B  47/117	7	ϳθС㡥ɺϳ졤ϻˤΡΣ	Detecting leaks, e.g. from tubing, by pressure testing [2012.01]
E21B  47/12  \	1	1	2D129	E21B  47/12	162	ͤɽؤޤɽͤء¬꿮ޤ濮ã뤿μʡ㡥﹦θءΣ	Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling [1,2012.01]
E21B  47/125  \	2	2	2D129	E21B  47/125	2	ŵƳΤȤ̤ѤΡżͥ륮ˤΣţ£ˡΣ	using earth as an electrical conductor  (by electromagnetic energy E21B 47/13) [2012.01]
E21B  47/13  \	2	2	2D129	E21B  47/13	51	żͥ륮ˤΡ㡥̵ӡΣ	by electromagnetic energy, e.g. of radio frequency range [2012.01]
E21B  47/135  \	3	3	2D129	E21B  47/135	10	ȡ㡥ֳޤϻ糰ѤΡΣ	using light waves, e.g. infrared or ultraviolet waves [2012.01]
E21B  47/14  \	2	2	2D129	E21B  47/14	27	ȤѤΡΣ	using acoustic waves [6]
E21B  47/16  \	3	3	2D129	E21B  47/16	13	ɥ륹ȥ󥰤ޤϥ󥰤̤ΡΣ	through the drill string or casing [6]
E21B  47/18  \	3	3	2D129	E21B  47/18	9	ͤήΤ̤ΡΣ	through the well fluid [6,2012.01]
E21B  47/20  \	4	4	2D129	E21B  47/20	14	ťȤĴˤΡ㡥Ϣ³ĴˤΡΣ	by modulation of mud waves, e.g. by continuous modulation [2012.01]
E21B  47/22  \	4	4	2D129	E21B  47/22	1	ɥѥפȴĤδ֤ΰƨۤѤťڥѥ륹ˤΡΣ	by negative mud pulses using a pressure relief valve between drill pipe and annulus [2012.01]
E21B  47/24  \	4	4	2D129	E21B  47/24	4	ɥѥǤήۤѤץ饹ťڥѥ륹ˤΡΣ	by positive mud pulses using a flow restricting valve within the drill pipe [2012.01]
E21B  47/26  \	1	1	2D129	E21B  47/26	5	ۡ˥ǡǼΡ㡥꡼ޤϵϿôΤˤΡΣ	Storing data down-hole, e.g. in a memory or on a record carrier [2012.01]
E21B  49/00  \	0	0	2D129	E21B  49/00	193	ɤλեᥤƥȡ﹦ޤϰͤäŬѤ롤ھޤϰήΤλ뤿ˡޤ֡Σ	Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells [2006.01]
E21B  49/02  \	1	1	2D129	E21B  49/02	106	ھεŪμˤΡΣ	by mechanically taking samples of the soil [2006.01]
E21B  49/04  \	2	2	2D129	E21B  49/04	0	ȯʪѤΡɤ˿ȯΤѤΡΣ	using explosives in boreholes; using projectiles penetrating the wall [3]
E21B  49/06  \	2	2	2D129	E21B  49/06	4	¦ɤ﹦빩ޤϥ쥤ѤѤ	using side-wall drilling tools or scrapers
E21B  49/08  \	1	1	2D129	E21B  49/08	141	ޤϰǡήλμ褹ޤήΤ뤿ΤΡΣ	Obtaining fluid samples or testing fluids, in boreholes or wells [3]
E21B  49/10  \	2	2	2D129	E21B  49/10	9	¦ѤήΥץ顼ޤϥƥѤΡΣ	using side-wall fluid samplers or testers [3]
