E21B   1/00		׷⼰﹦Σ	Percussion drilling	2368
E21B   1/02		ɥåץϥޡ㡥֥դΡѤϾǶưΡΣ	Surface drives for drop hammers, e.g. with a cable	1089
E21B   1/04		Ͼǥåɤޤϥ֥αưž뤿	Devices for reversing the movement of the rod or cable at the surface	135
E21B   1/12		ư򤹤׷ͭΡʣţ£ţ£ͥˡΣ	with a reciprocating impulse member(<b>E21B1/02</b>, <b>E21B1/38</b> take precedence)	352
E21B   1/14		žǶưΡΣ	driven by a rotating mechanism	199
E21B   1/16		ץ󥰤դưΤͭΡ㡥åͭΡΣ	with spring-mounted reciprocating masses, e.g. with air cushion	154
E21B   1/18		ư֤Υץå塦åɤؤΡŤδ˾ץץ󥰤ˤΤϢ֤ͭΡΣ	with elastic joining of the drive to the push-rod by double buffer springs	131
E21B   1/20		ϥϥޡȤƹ줿ΡΣ	formed as centrifugal hammers	70
E21B   1/22		żϤǶưΡΣ	driven by electromagnets	191
E21B   1/24		׷बήΰϤľܶưԥȥǤΡΣ	the impulse member being a piston driven directly by fluid pressure	230
E21B   1/26		ΰϤˤΡΣ	by liquid pressure	1339
E21B   1/28		ѥ륹ǺưΡΣ	working with pulses	86
E21B   1/30		ޤϵΤΰϤˤΡΣ	by air, steam or gas pressure	1220
E21B   1/32		ѥ륹ǺưΡΣ	working with pulses	73
E21B   1/34		׷बǳؤΥԥȥǤΡΣ	the impulse member being a piston of an internal-combustion engine	201
E21B   1/36		ġ롦ꥢԥȥ󼰤ΤΡʤġ뤬׷³ƤΡΣ	Tool-carrier piston type, i.e. in which the tool is connected to an impulse member	157
E21B   1/38		ϥޡԥȥ󼰤ΤΡʤġӥåȤޤϤʤȤ׷ˤäǷ⤵ΡΣ	Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member	422
E21B   3/00		žΣ	Rotary drilling	4585
E21B   3/02		ž﹦򤹤뤿ϾǶư	Surface drives for rotary drilling	13178
E21B   3/025		ġ뤬˲žΡΣ	with a to-and-fro rotation of the tool	286
E21B   3/03		ġ뤬³Ū˰βžԤΡΣ	with an intermittent unidirectional rotation of the tool	68
E21B   3/035		ޤΤư֤ͭΡΣ	with slipping or elastic transmission	115
E21B   3/04		ơ֥	Rotary tables	1201
E21B   3/06		ơ֥ư뤳ȤŪȤɥŬѡΣ	Adaptation of rotary draw works to drive rotary tables	239
E21B   4/00		﹦ѤΤ˹ǶưΡΣ	Drives for drilling, used in the borehole	2786
E21B   4/02		ήΤˤžư֡Σ	Fluid rotary type drives	3954
E21B   4/04		ŵˤư֡ʣţ£ͥˡΣ	Electric drives(<b>E21B4/12</b> takes precedence)	1462
E21B   4/06		ۡ뼰׷ʡ㡥ϥޡʥܡ󥰡ţ£ˡΣ	Down-hole impacting means, e.g. hammers(boring rams <b>E21B11/02</b>)	1285
E21B   4/08		ϤΤߤ׷ˤΡ㡥ȥ⡼ϢΣ	impact being obtained by gravity only, e.g. with lost-motion connection	118
E21B   4/10		Ϣ³׷뼴ޤϥɥѥפϢ³ŪʰžưˤΡΣ	continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts	258
E21B   4/12		ŵˤưϥޡΣ	Electrically operated hammers	153
E21B   4/14		ήΤˤưϥޡΣ	Fluid operated hammers	3343
E21B   4/16		ʣΥۡ뼰ư֡㡥ž׷⼰﹦ѡʣţ£ͥˡ¿ΥӥåȤĺ﹦֤Τζư֡Σ	Plural down-hole drives, e.g. for combined percussion and rotary drilling(<b>E21B4/10</b> takes precedence);Drives for multi-bit drilling units	2913
E21B   4/18		˷αޤΡΣ	Anchoring or feeding in the borehole	739
E21B   4/20		ϾζưʤȤ߹蘆줿Ρʣţ£ͥˡΣ	combined with surface drive(<b>E21B4/10</b> takes precedence)	303
E21B   6/00		ž׷⼰﹦Ѷư֡Σ	Drives for drilling with combined rotary and percussive action	1488
E21B   6/02		žϢ³ŪǤΡΣ	the rotation being continuous	489
E21B   6/04		ư֤׷ѤȲžѤ̤ˤʤäƤΡΣ	Separate drives for percussion and rotation	407
E21B   6/06		ž³ŪʤΡ㡥ߤ֤ˤΡΣ	the rotation being intermittent, e.g. obtained by a ratchet device	449
E21B   6/08		ư֤׷ѤȲžѤ̤ˤʤäƤΡΣ	Separate drives for percussion and rotation	160
E21B   7/00		﹦ѤΤüˡޤ֡Σ	Special methods or apparatus for drilling	13058
E21B   7/02		ΦμʤħΤ﹦㡥åɤޤϼؤͤ줿ΡΣ	Drilling rigs characterised by means for land transport, e.g. skid mounting or wheel mounting	20627
E21B   7/04		з	Directional drilling	14672
E21B   7/06		򷹼Ф	Deflecting the direction of boreholes	4768
E21B   7/08		ܡ󥰤򷹼Ф뤿ü֡㡥üʥɥӥåȡʥå른祤ȡۥåץȥåΣ	Special apparatus for deflecting the boring, e.g. special drill bits, knuckle joints or whipstocks	2985
E21B   7/10		Фν	Correction of deflected boreholes	1214
E21B   7/12		﹦ʾ岼ư֤ѤΣţ£ˡΣ	Underwater drilling (using heave compensators <b>E21B19/09</b>)	2445
E21B   7/124		ưˤư湩ˤΡ㡥ǻѤ¼﹦֡Σ	with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors	567
E21B   7/128		˸ꤵ줿äΩͷٻ椫ԤΡΣ	from floating support with independent underwater anchored guide base	623
E21B   7/132		ͷٻ椫ԤΡΣ	from underwater buoyant support	187
E21B   7/136		ͷƤʤٻ椫ԤΡʣţ£ͥˡΣ	from non-buoyant support(<b>E21B7/124</b> takes precedence)	196
E21B   7/14		ǮѤ﹦㡥б﹦	Drilling by use of heat, e.g. flame drilling	1102
E21B   7/15		ŵŪǮˤΡΣ	of electrically generated heat	629
E21B   7/16		ɥΰϤˤäơФФʵޤϾ򲡤ĤΡʤåȥɥ	Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling	216
E21B   7/18		Ѥ뤫ϻѤʤΤޤϥåȤˤ﹦ʣţ£ͥˡΣ	Drilling by liquid or gas jets, with or without entrained pellets(<b>E21B7/14</b> takes precedence)	4123
E21B   7/20		ؤΥ󥰤ޤϴɤǤߤޤϲߡ㡥ߡ﹦ȥ󥰤֤Ʊ˹ԤΡΣ	Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes	5426
E21B   7/24		ưʡ㡥ʿ׽ſѤ﹦ʾ׷⼰﹦ţ£ˡΣ	Drilling using vibrating or oscillating means, e.g. out-of-balance masses(percussion drilling <b>E21B1/00</b>)	2486
E21B   7/26		ڤʤǹԤ﹦㡥ʿʼ﹦֤ˤ롤ʣţ£ͥˡΣ	Drilling without earth removal, e.g. with self-propelled burrowing devices(<b>E21B7/30</b> takes precedence)	1186
E21B   7/28		﹦γȷ㡥߲ˤΣ	Enlarging drilled holes, e.g. by counterboring	4877
E21B   7/30		ڤʤΡΣ	without earth removal	626
E21B  10/00		ɥӥåȡʺ﹦򷹼Ф뤿̤ѤΣţ£ʪ򽸤뤿μʤͭΣţ£ˡΣ	Drill bits(specially adapted for deflecting the direction of boring <b>E21B7/08</b>; with means for collecting substances <b>E21B27/00</b>)	4905
E21B  10/02		ӥåȡʬˤäħŤ줿Σţ£ˡΣ	Core bits (characterised by wear resisting parts <b>E21B10/48</b>)	1647
E21B  10/04		˲ʤĤΡΣ	with core destroying means	363
E21B  10/06		ӥåȡΣ	Roller core bits	261
E21B  10/08		ɥӥåȡʣţ£ͥ表ӥåȣţ£ʬˤäħŤ줿Σţ£ˡΣ	Roller bits (<b>E21B10/26</b> takes precedence;  roller core bits <b>E21B10/06</b>;  characterised by wear resisting parts <b>E21B10/50</b>)	1671
E21B  10/10		ξü˻ٻ줿鼴ĤΡΣ	with roller axle supported at both ends	425
E21B  10/12		ǥåĤΡΣ	with disc cutters	625
E21B  10/14		ƳʬͭʳΤΤǲžʤåȤ߹碌ΡΣ	combined with non-rolling cutters other than of leading-portion type	230
E21B  10/16		ηޤˤäħŤ줿ΡΣ	characterised by tooth form or arrangement	1448
E21B  10/18		﹦ήΤΤƳϩޤϥΥˤäħŤ줿ΡΣ	characterised by conduits or nozzles for drilling fluids	1275
E21B  10/20		ʬΥǽޤĴǽʬ㡥ޤϼˤäħŤ줿ΡΣ	characterised by detachable or adjustable parts, e.g. legs or axles	712
E21B  10/22		ޤϥκˤäħŤ줿ΡΣ	characterised by bearing, lubrication or sealing details	1685
E21B  10/23		ؤκ﹦ήΤζȼΡΣ	with drilling fluid supply to the bearings	119
E21B  10/24		κˤäħŤ줿Ρʣţ£ͥˡΣ	characterised by lubricating details(<b>E21B10/23</b> takes precedence)	899
E21B  10/25		κˤäħŤ줿ΡΣ	characterised by sealing details	701
E21B  10/26		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 <b>E21B10/40</b>)	3203
E21B  10/28		ʤ饫åĤΡΣ	with non-expansible roller cutters	579
E21B  10/30		ļ꡼ޡ㡥꡼ޥӥ饤Σ	Longitudinal axis roller reamers, e.g. reamer stabilisers	432
E21B  10/32		϶ĤΡΣ	with expansible cutting tools	4171
E21B  10/34		饫åΤΡΣ	of roller-cutter type	514
E21B  10/36		׷⼰ɥӥåȡʬˤäħŤ줿Σţ£ˡΣ	Percussion drill bits(characterised by wear resisting parts <b>E21B10/46</b>)	2653
E21B  10/38		﹦ήΤΤƳϩޤϥΥˤäħŤ줿ΡΣ	characterised by conduits or nozzles for drilling fluids	1024
E21B  10/40		ƳʬĤΡΣ	with leading portion	539
E21B  10/42		֥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 <b>E21B10/46</b>, by conduits or nozzles for drilling fluid <b>E21B10/60</b>, by detachable parts <b>E21B10/62</b>)	3319
E21B  10/43		ڿϤޤϤ¾ڤǤ֤ˤäħŤ줿ΡΣ	characterised by the arrangement of teeth or other cutting elements	5169
E21B  10/44		餻αʬĥӥåɡ㡥塼ӥåȡƳʬĤޤʬΥǽʬĥʣţ£ͥˡΣ	Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts(<b>E21B10/42</b> takes precedence)	3535
E21B  10/46		ʬ㡥ɤΥ󥵡ȡˤäħŤ줿ΡΣ	characterised by wear resisting parts, e.g. diamond inserts	4966
E21B  10/48		ΤΡΣ	the bit being of core type	959
E21B  10/50		ΤΡΣ	the bit being of roller type	777
E21B  10/52		ޤϥܥΥ󥵡ȤĤΡΣ	with chisel- or button-type inserts	784
E21B  10/54		žɥӥåȡ㡥եӥåȡΣ	the bit being of the rotary drag type, e.g. fork-type bits	2107
E21B  10/55		ͽŪڤǤͭΡΣ	with preformed cutting elements	1075
E21B  10/56		ܥΥ󥵡ȡʣţ£ͥˡΣ	Button-type inserts(<b>E21B10/52</b> takes precedence)	1887
E21B  10/567		ۤʤٻΤ˿Ĥ줿ͽŪڤǤͭΡ㡥¿뾽Υ󥵡ȡΣ	with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts	1525
E21B  10/573		ٻΤκˤäħդΡ㡥¤ޤϴڤǤȤܹΣ	characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element	753
E21B  10/58		Υ󥵡ȡʣţ£ͥˡΣ	Chisel-type inserts(<b>E21B10/52</b> takes precedence)	826
E21B  10/60		﹦ήΤΤƳϩޤϥΥˤäħŤ줿Ρʥɥӥåѣţ£׷⼰ɥӥåѣţ£ˡΣ	characterised by conduits or nozzles for drilling fluids(for roller bits <b>E21B10/18</b>; for percussion drill bits <b>E21B10/38</b>)	5272
E21B  10/61		Υι¤ˤäħդΡΣ	characterised by nozzle structure	1051
E21B  10/62		ʬΥǽޤĴǽʡ㡥ڤǤˤäħŤ줿Ρʣţ£ͥ表ɥӥåѣţ£ѣţ£ˡΣ	characterised by parts, e.g. cutting elements, which are detachable or adjustable(<b>E21B10/64</b> takes precedence; for roller bits <b>E21B10/20</b>; for augers <b>E21B10/44</b>)	2949
E21B  10/627		ʣʬΥǽڤǤͭΡΣ	with plural detachable cutting elements	211
E21B  10/633		ñȤʬΥǽʤΡΣ	independently detachable	665
E21B  10/64		ؤǽޤϹ椫ǽΤޤϰʬˤäħŤ줿ΡΣ	characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe	388
E21B  10/66		ɥѥưǽǲذưǽڤǤĤΡΣ	the cutting element being movable through the drilling pipe and laterally shiftable	318
E21B  11/00		¾κ﹦ѹ	Other drilling tools	1811
E21B  11/02		ܡ󥰡Σ	Boring rams	243
E21B  11/04		ܡ󥰡	Boring grabs	517
E21B  11/06		åƥ󥰥ޤζưѤ	with driven cutting chains or similarly-driven tools	154
E21B  12/00		﹦ѹΤ°Σ	Accessories for drilling tools	6565
E21B  12/02		ɽ֡Σ	Wear indicators	451
E21B  12/04		ɥӥåݸ֡Σ	Drill bit protectors	680
E21B  12/06		Ū֡Σ	Mechanical cleaning devices	2463
E21B  15/00		﹦λٻΡ㡥Ϧʤ䤰ˡޥȡΣ	Supports for the drilling machine, e.g. derricks or masts	23426
E21B  15/02		﹦äŬ礷Ρʣţ£ͥˡΣ	specially adapted for underwater drilling(<b>E21B15/04</b> takes precedence)	1826
E21B  15/04		зäŬ礷Ρ㡥йѺ﹦֡Σ	specially adapted for directional drilling, e.g. slant hole rigs	5386
E21B  17/00		ɥåɤޤϥѥסߥɥ륹ȥ󥰡꡼ɥ륫顼ååɡ󥰡塼ӥ󥰡Σ	Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings	16594
E21B  17/01		饤Σ	Risers	3094
E21B  17/02		åץ󥰡祤	Couplings; Joints	9143
E21B  17/03		ɥåɤޤϥѥפȥɥ롦⡼Ȥδ֤ΤΡ㡥ɥåɤȥϥޡδ֤ΤΡΣ	between drilling rod or pipe and drill motor, e.g. between drilling rod and hammer	1340
E21B  17/04		åɤȥӥåȤδ֤ΤΡޤϥåɤȥåɤδ֤Τ	between rod and bit, or between rod and rod	3690
E21B  17/042		ͤڤΤ	threaded	6955
E21B  17/043		ݤʤä	with locking means	1032
E21B  17/046		֡ԥޤϥ硼­Ūʹ¤ޤΤΡ㡥Хͥåȥå㡤Ĥ	with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches	3610
E21B  17/05		٥른祤	Swivel joints	928
E21B  17/06		꡼󥰥祤ȡ㡥եƥ祤	Releasing-joints, e.g. safety joints	1444
E21B  17/07		ɥ륹ȥ󥰤ĹѤ뤿ο̷Ѽꡨ˾֡Σ	Telescoping joints for varying drill string lengths; Shock absorbers	2940
E21B  17/08		󥰥祤	Casing joints	3817
E21B  17/10		ץƥȥ饤Σ	Wear protectors; Centralising devices	14760
E21B  17/12		ץƥμդޤϼϤ	Devices for placing or drawing out wear protectors	231
E21B  17/14		󥰥塼	Casing shoes	727
E21B  17/16		ɥ륫顼Σ	Drill collars	834
E21B  17/18		ʣήϩĥѥסΣ	Pipes provided with plural fluid passages	1743
E21B  17/20		߼ޤʬἰΥɥѥסΣ	Flexible or articulated drilling pipes	2009
E21B  17/22		餻¤ĥåɤޤϥѥסΣ	Rods or pipes with helical structure	3967
E21B  19/00		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	7951
E21B  19/02		åɤޤϥ֥η֡Σ	Rod or cable suspensions	2730
E21B  19/04		եå	Hooks	374
E21B  19/06		١ʤåɤޤϥ塼֤Ĥ	Elevators, i.e. rod- or tube-gripping devices	2633
E21B  19/07		å׷١Σ	Slip-type elevators	625
E21B  19/08		åɤޤϥ֥֡ʣţ£ͥ表ưţ£ˡ﹦ѹؤΰϤ뤿֡åɤν̤Ĥꤢ碌뤿֡Σ	Apparatus for feeding the rods or cables(<b>E21B19/22</b> takes precedence; automatic feed <b>E21B44/02</b>);Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods	4203
E21B  19/081		ͤȥʥåȤ굡Σ	Screw-and-nut feed mechanisms	1503
E21B  19/083		ࡤåޤΤΤ굡Σ	Cam, rack or like feed mechanisms	446
E21B  19/084		Τĥʡ㡥֥ͭΡΣ	with flexible drawing means, e.g. cables	1621
E21B  19/086		ΤǶư륷ĤΡʣţ£ţ£ţ£ͥˡΣ	with a fluid-actuated cylinder(<b>E21B19/084</b>, <b>E21B19/087</b>, <b>E21B19/09</b> take precedence)	2353
E21B  19/087		ɤ륢ʤˤΡΣ	by means of a swinging arm	475
E21B  19/089		ץ󥰤ޤɲòٽŤͭΡΣ	with a spring or an additional weight	115
E21B  19/09		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	699
E21B  19/10		åסѥ	Slips; Spiders	5133
E21B  19/12		פĤ߶Σ	Rope clamps	336
E21B  19/14		åɤܤΤޤ³ĹݤĤΥåסȥդ뤤ϥӥݴɾȹȤδ֤ʣţ£ţ£ͥˡΣ	Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole(<b>E21B19/20</b>, <b>E21B19/22</b> take precedence)	5855
E21B  19/15		ʿ֤ǤΥåɤΥå󥰡ʿȿľΰ֤δ֤ǤΣ	Racking of rods in horizontal position; Handling between horizontal and vertical position	2234
E21B  19/16		ѥץåץ󥰤ޤϥ祤ȤΤϤϤʣţ£ͥˡΣ	Connecting or disconnecting pipe couplings or joints(<b>E21B19/20</b> takes precedence)	7642
E21B  19/18		ɥӥåȤޤϥɥѥפΤϤϤΣ	Connecting or disconnecting drill bit and drilling pipe	2280
E21B  19/20		å³ȤȤ߹碌줿Ρ㡥ưŪ˹ԤʤΡΣ	Combined feeding from rack and connecting, e.g. automatically	847
E21B  19/22		줿ѥפޤϥåɤ㡥ߥɥѥסΣ	Handling reeled pipe or rod units, e.g. flexible drilling pipes	2471
E21B  19/24		ɥåɤޤϥѥѤΥ֤ޤϥȥ饤֡Σ	Guiding or centralising devices for drilling rods or pipes	3421
E21B  21/00		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 <b>E21B31/03</b>)	13227
E21B  21/01		γǺ﹦ήΤ⤷Ϻ﹦򰷤֡㡥ťȢΣ	Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes	4813
E21B  21/015		﹦˴ؤʡ㡥ѥաɡΣ	Means engaging the bore entrance, e.g. hoods for collecting dust	2983
E21B  21/02		ۡΥ٥른祤	Swivel joints in hose lines	603
E21B  21/06		γǺ﹦ήΤ뤿֡Σ	Arrangements for treating drilling fluids outside the borehole	8016
E21B  21/07		кΥήΤ뤿ΤΡΣ	for treating dust-laden gaseous fluids	648
E21B  21/08		﹦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 <b>E21B21/10</b>)	4600
E21B  21/10		﹦ήΤν۴ĥƥˤ֡Σ	Valves arrangements in drilling-fluid circulation systems	5010
E21B  21/12		ʣήϩĥɥѥפλѤˤΡ㡥Ľ۴ĥƥΣ	using drilling pipes with plural fluid passages, e.g. closed circulation systems	1336
E21B  21/14		ΤȵΤѤΡ㡥ˢΣ	using liquids and gases, e.g. foams	1461
E21B  21/16		ήΤѤΡʣţ£ͥˡΣ	using gaseous fluids(<b>E21B21/14</b> takes precedence)	1822
E21B  21/18		ɥ롦⡼Фӵ̤˿᤭դΤɤΡΣ	Preventing exhaust air from the drill motor from blowing-off towards the working face	24
E21B  23/00		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 <b>E21B43/10</b>)	8441
E21B  23/01		ޤϤΤΤθѡʣţ£ţ£ͥ表ζư֤θţ£ˡΣ	for anchoring the tools or the like(<b>E21B23/02 to E21B23/06</b>  take precedence; anchoring of drives in the borehole <b>E21B4/18</b>)	4422
E21B  23/02		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(<b>E21B23/03 to E21B23/06</b>  take precedence)	1407
E21B  23/03		¦껦褦˿Ĥ줿˥åץޤϤܤߤع֤뤿ΤΡޤϤ餫鹩ư뤿ΤΡΣ	for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets	651
E21B  23/04		ήμʤˤäƺưΡ㡥ȯˤưΡʣţ£ͥˡΣ	operated by fluid means, e.g. actuated by explosion  (<b>E21B23/08</b> takes precedence)	2702
E21B  23/06		ѥå֤뤳Ȥ˴ؤ	for setting packers	3024
E21B  23/08		ήΰˤäƹƳޤԤΡ㡥롼ե饤󹩶񥷥ƥΣ	Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems	1283
E21B  23/10		äŬ礷Σ	Tools specially adapted therefor	488
E21B  23/12		žΡΣ	Tool diverters	335
E21B  23/14		֥ޤϥ֥빩ִѡ㡥Фͤˤ븡ؤޤϺ﹦ѡΣ	for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells	1439
E21B  25/00		𤵤ʤμ褢뤤ϼФ֡㡥С롤ȴʥӥåȣţ£ˡΣ	Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits <b>E21B10/02</b>)	5437
E21B  25/02		ɥѥפ夲뤳Ȥʤ˹ǽʤޤϹ椫ǽʥ쥷СΣ	the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe	848
E21B  25/04		ѤΥåƥ󥰥åޤǤĥ쥷С㡥ѥСΣ	the core receiver having a core forming cutting edge or element, e.g. punch type core barrels	345
E21B  25/06		ߤ䤹饤ʡޤĥǽݻʤĥ쥷СΣ	the core receiver having a flexible liner or inflatable retaining means	223
E21B  25/08		ʤ롤ǲʣţ£ͥˡʤޤϰǤΥβΣ	Coating, freezing, consolidating cores(<b>E21B25/06</b> takes precedence);Recovering uncontaminated cores or cores at formation pressure	528
E21B  25/10		ݻޤǤʤ줿Ρʣţ£ţ£ͥˡΣ	Formed core retaining or severing means(<b>E21B25/06</b>, <b>E21B25/08</b> take precedence)	1175
E21B  25/12		ưӷΤΡΣ	of the sliding wedge type	81
E21B  25/14		μФƲμͤ줿ΡΣ	mounted on pivot transverse to core axis	146
E21B  25/16		Τ狼륳뤿ΤΡΣ	for obtaining oriented cores	728
E21B  25/18		ǤäŬ礷쥷СΣ	the core receiver being specially adapted for operation under water	553
E21B  27/00		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	2773
E21B  27/02		ץ٥顼ʤȤޤϻʤɤʪݻѤƴΣ	Dump bailers, i.e. containers for depositing substances, e.g. cement or acids	618
E21B  27/04		ޤݻʤ餻α¼ʤޤΡΣ	where the collecting or depositing means include helical conveying means	264
E21B  28/00		ޤϰѤοưȯ֡㡥ɷѡʷ¬ãѣţ£ϵʪŪ¬ѣǣ֣ˡΣ	Vibration generating arrangements for boreholes or wells, e.g. for stimulating production(for transmitting measuring-signals <b>E21B47/14</b>; for geophysical measurements <b>G01V1/02</b>)	2281
E21B  29/00		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	4131
E21B  29/02		ȯޤǮŪޤϲŪʤˤΡΣ	by explosives or by thermal or chemical means	1070
E21B  29/04		磻饤ޤϤΤΤǡʣţ£ͥˡΣ	Cutting of wire lines or the like(<b>E21B29/02</b> takes precedence)	259
E21B  29/06		ǡ㡥ۥåץȥåΤη륫åʣţ£ͥˡΣ	Cutting windows, e.g. directional window cutters for whipstock operations(<b>E21B29/08</b> takes precedence)	1186
E21B  29/08		ήΤή椹뤿ΥѥפǤޤѷΣ	Cutting or deforming pipes to control fluid flow	531
E21B  29/10		ͥ󥰤ν㡥ޤäˤ뤳ȡΣ	Reconditioning of well casings, e.g. straightening	2042
E21B  29/12		äŬ礷Ρʣţ£ͥˡΣ	specially adapted for underwater installations(<b>E21B29/08</b> takes precedence)	556
E21B  31/00		ޤϰͤǤʪΤκȤޤϼΣ	Fishing for or freeing objects in boreholes or wells	2528
E21B  31/03		ˤΣ	Freeing by flushing	587
E21B  31/06		ФμʤѤΡΣ	using magnetic means	777
E21B  31/08		󥯥ХåȤޤϤΤΤѤΡΣ	using junk baskets or the like	402
E21B  31/107		夷ʤ뤿ξ׷ʤѤΡ㡥㡼Σ	using impact means for releasing stuck parts, e.g. jars	1124
E21B  31/113		尵ǺưΡΣ	hydraulically operated	745
E21B  31/12		ªѹ㡥ȥ󥰤ޤϥ	Grappling tools, e.g. tongs or grabs	1467
E21B  31/14		Ф餻ʤĤΡ㡥ʥå른祤ȤλѤˤΡΣ	with means deflecting the direction of the tool, e.g. by use of knuckle joints	108
E21B  31/16		Ǥޤ˲ʤȤ߹蘆줿ΡΣ	combined with cutting or destroying means	684
E21B  31/18		¦ĻΡ㡥СåȡΣ	gripping externally, e.g. overshot	2903
E21B  31/20		¦ĻΡ㡥եå󥰥ڥΣ	gripping internally, e.g. fishing spears	1816
E21B  33/00		ޤϰ̩ͤޤϥѥå	Sealing or packing boreholes or wells	1844
E21B  33/02		ɽǤ̩ޤϥѥå	Surface sealing or packing	745
E21B  33/03		֡ΤȤΩơΣ	Well heads; Setting-up thereof	11224
E21B  33/035		äŬ礷Ρʣţ£ţ£ţ£ͥˡΣ	specially adapted for underwater installations(<b>E21B33/043</b>, <b>E21B33/064</b>, <b>E21B33/076</b> take precedence)	2875
E21B  33/037		Τݸϥ󥰡Σ	Protective housings therefor	498
E21B  33/038		֤˻Ѥ륳ͥ㡥ʮɻ֤ȥ饤Ϣ뤹뤿ΤΡΣ	Connectors used on well heads, e.g. for connecting blow-out preventer and riser	2056
E21B  33/04		󥰥إåɡǤΥ󥰤ޤϥ塼ӥ󥰤η͡Σ	Casing heads; Suspending casings or tubings in well heads	4061
E21B  33/043		湣֤äŬ礷Ρʣţ£ͥˡΣ	specially adapted for underwater well heads(<b>E21B33/047</b> takes precedence)	1013
E21B  33/047		ʣΥ塼ӥ󥰥ȥ󥰤ΤΤΡΣ	for plural tubing strings	690
E21B  33/05		󥰥إåɡ㡥󥰥ץ饰뤿Ĥ	Cementing-heads, e.g. having provision for introducing cementing plugs	490
E21B  33/06		ʮɻ֡Σ	Blow-out preventers	7199
E21B  33/064		湣֤äŬ礷ΡΣ	specially adapted for underwater well heads	991
E21B  33/068		ʪΤޤʪΤͤƳ뤿Ρޤϰͤ뤿ĤΡʥ󥰥إåɣţ£ˡΣ	having provision for introducing objects or fluids into, or removing objects from, wells(cementing-heads <b>E21B33/05</b>)	1445
E21B  33/072		֥빩ΤΤΡʣţ£ͥˡΣ	for cable-operated tools(<b>E21B33/076</b> takes precedence)	477
E21B  33/076		äŬ礷ΡΣ	specially adapted for underwater installations	587
E21B  33/08		磻ѡ륻С	Wipers; Oil savers	1687
E21B  33/10		Τ	in the borehole	1763
E21B  33/12		ѥåץ饰ʥ󥰤ΤѤΣţ£ţ£	Packers; Plugs(used for cementing <b>E21B33/134</b>, <b>E21B33/16</b>)	12275
E21B  33/122		¿ʥȥ󥰥ѥå	Multiple-string packers	1371
E21B  33/124		֤ξʬΥ뤿˽ΰʬ˥ץ饰ߤ˥å	Units with longitudinally-spaced plugs for isolating the intermediate space	1449
E21B  33/126		ήΰǺưΥåפޤϥȤĤΡʣţ£ţ£ͥ	with fluid-pressure-operated elastic cup or skirt(<b>E21B33/122</b>, <b>E21B33/124</b> take precedence)	2168
E21B  33/127		դॹ꡼֤ĤΡʣţ£ţ£ͥ	with inflatable sleeve(<b>E21B33/122</b>, <b>E21B33/124</b> take precedence)	4158
E21B  33/128		ΰϤˤäȾĥĤΡʣţ£ţ£ͥ	with a member expanded radially by axial pressure(<b>E21B33/122</b>, <b>E21B33/124</b> take precedence)	3063
E21B  33/129		ǡǰóݤ뤿εŪåפäΡʣţ£ţ£ͥ	with mechanical slips for hooking into the casing(<b>E21B33/122</b>, <b>E21B33/124</b> take precedence)	2849
E21B  33/1295		ήΰǺưΡΣ	actuated by fluid pressure	1108
E21B  33/13		ꡤܤޤϤΤΤդΥ󥰤ˡޤ֡Σ	Methods or devices for cementing, for plugging holes, crevices or the like	14340
E21B  33/134		֥åץ饰	Bridging plugs	3364
E21B  33/136		Хåȡ㡥Τ	Baskets, e.g. of umbrella type	175
E21B  33/138		ɤؤ	Plastering the borehole wall; Injecting into the formation	5047
E21B  33/14		˥󥰤򥻥󥰤뤿Τ	for cementing casings into boreholes	4127
E21B  33/16		ʬʬ뤿Υץ饰ѤΡΤΥץ饰	using plugs for isolating cement charge; Plugs therefor	1101
E21B  34/00		ޤϰͤΤ֡Σ	Valve arrangements for boreholes or wells	3631
E21B  34/02		֤ˤΡΣ	in well heads	6182
E21B  34/04		湣֤ˤΡΣ	in underwater well heads	1209
E21B  34/06		ͤˤΡΣ	in wells	9162
E21B  34/08		μ褵줿ήΤήޤϰϤ˱Ρʣţ£ͥˡΣ	responsive to flow or pressure of the fluid obtained(<b>E21B34/10</b> takes precedence)	3692
E21B  34/10		γ鶡뤵ήΤˤΡΣ	operated by control fluid supplied from outside the borehole	4263
E21B  34/12		󥰤ޤϥ塼ӥ󥰤ưˤΡΣ	operated by movement of casings or tubings	1538
E21B  34/14		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	5355
E21B  34/16		ΤʤγˤΡΣ	Control means therefor being outside the borehole	1686
E21B  35/00		ɲФޤϾòФΤˡޤ֡Σ	Methods or apparatus for preventing or extinguishing fires	821
E21B  36/00		ޤϰͤΤβǮѡΥ֡㡥ʵӤǻѤ뤿ΤΡΣ	Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones	4004
E21B  36/02		СʡѤΡΣ	using burners	721
E21B  36/04		ŵŪҡѤΡΣ	using electrical heaters	2530
E21B  37/00		ޤϰͤݤΤˡޤ֡ʣţ£ͥˡΣ	Methods or apparatus for cleaning boreholes or wells(<b>E21B21/00</b> takes precedence)	6510
E21B  37/02		äˤŬ礷쥤	Scrapers specially adapted therefor	3551
E21B  37/04		ήΰˤΡ㡥ե꡼ԥȥ󥹥쥤ѡΣ	operated by fluid pressure, e.g. free-piston scrapers	515
E21B  37/06		ѥեޤƱͤʪΤѤɻߤޤ¤ŪȤ벽ŪʤѤΡΣ	using chemical means for preventing or limiting the deposition of paraffins or like substances	3835
E21B  37/08		Υե륿꡼󡤤ޤϺŶΤ򸽾ݤΡʣţ£ͥˡΣ	cleaning <u>in situ</u> of down-hole filters, screens, or gravel packs(<b>E21B37/06</b> takes precedence)	1124
E21B  37/10		ѥå֡Σ	Well swabs	397
E21B  40/00		塼ӥ󥰥å㡨ưŪͤΥ塼ӥߤ	Tubing catchers, automatically arresting the fall of oil-well tubing	220
E21B  41/00		롼ףţ£ţ£ˤäƥСʤޤϺ	Equipment or details not covered by groups <b>E21B15/00 to E21B40/00</b> 	18470
E21B  41/02		ޤϰˤƸ忩ΡΣ	<u>in situ</u> inhibition of corrosion in boreholes or wells	1684
E21B  41/04		ΤΥޥ˥ץ졼㡥֤˰ŪϢ뤵ΡΣ	Manipulators for underwater operations, e.g. temporarily connected to well heads	644
E21B  41/06		Τκȼ㡥֤ˡŪϢ뤵ΡΣ	Work chambers for underwater operations, e.g. temporarily connected to well heads	145
E21B  41/08		Υɡ١㡥﹦ƥץ졼ȡΤο¬̡Σ	Underwater guide bases, e.g. drilling templates; Levelling thereof	250
E21B  41/10		ɡݥȡ㡥곰ΤǤΡΥɡ١ؤΥμդΣ	Guide posts, e.g. releasable; Attaching guide lines to underwater guide bases	341
E21B  43/00		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 <b>E03B</b>)	26576
E21B  43/01		κμäŬ礷ΡΣ	specially adapted for obtaining from underwater installations	4409
E21B  43/013		湣֤ػХե饤Ϣ뤹ΡΣ	Connecting a production flow line to an underwater well head	979
E21B  43/017		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	656
E21B  43/02		ڤΤΣ	Subsoil filtering	1447
E21B  43/04		ͤƤ󤷤	Gravelling of wells	2589
E21B  43/08		꡼ޤϥ饤	Screens or liners	6955
E21B  43/10		ͤ˥󥰡꡼ޤϥ饤ʡ֤ΡΣ	Setting of casings, screens or liners in wells	4412
E21B  43/11		ꤢѡߥ	Perforators; Permeators	2118
E21B  43/112		Ȥꤦꤢäꤢ㡥ήμʤˤäƺư	Perforators with extendable perforating members, e.g. actuated by fluid means	489
E21B  43/114		ľܡήΤκѡ㡥亽ΥåȡѤꤢ	Perforators using direct fluid action, e.g. abrasive jets	1355
E21B  43/116		ƴݤޤꤢ	Gun or shaped-charge perforators	2621
E21B  43/117		ꤢʣţ£ͥ	Shaped-charge perforators(<b>E21B43/118</b> takes precedence)	1602
E21B  43/118		ľΰ֤ǹߤƤҤĤŤѰ֤˷뤳ȤħȤ	characterised by lowering in vertical position and subsequent tilting to operating position	122
E21B  43/1185		ХƥΣ	Ignition systems	1393
E21B  43/119		㡥ꤢޤ뤿Τ	Details, e.g. for locating perforating place or direction	2450
E21B  43/12		μ褵줿ήΤήΰͤؤΤޤϰǤԤˡޤ֡ʣţ£ͥ表֣ţ£	Methods or apparatus for controlling the flow of the obtained fluid to or in wells(<b>E21B43/25</b> takes precedence; valve arrangements <b>E21B34/00</b>)	14020
E21B  43/14		¿ؤκμ	Obtaining from a multiple-zone well	4126
E21B  43/16		úǤμ褹뤿ζˡΣ	Enhanced recovery methods for obtaining hydrocarbons	10126
E21B  43/17		ĤޤϤʾΰͤե饯󥰤ޤؤ򹶤¾ˡˤϢ뤹뤳ȤˤΡʣţ£ͥˡΣ	Interconnecting two or more wells by fracturing or otherwise attacking the formation(<b>E21B43/247</b> takes precedence)	588
E21B  43/18		ƲðޤϿˡ	Repressuring or vacuum methods	1214
E21B  43/20		并ˡ	Displacing by water	9228
E21B  43/22		ʤޤϥХƥꥢκѤѤΡʣţ£ͥˡΣ	Use of chemicals or bacterial activity(<b>E21B43/27</b> takes precedence)	9630
E21B  43/24		ǮȤΡ㡥Σ	using heat, e.g. steam injection	10372
E21B  43/241		úǤǤʤʪϲιۤȹ碌Ρ㡥ǴϲǮʬΣ	combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale	373
E21B  43/243		ǳƤΡΣ	Combustion <u>in situ</u>	1886
E21B  43/247		ե饯󥰤μ˴ϢΡΣ	in association with fracturing processes	643
E21B  43/248		ȯʪѤΡΣ	using explosives	162
E21B  43/25		ɷ㤹뤳Ȥˤ껺ФˡΣ	Methods for stimulating production	3952
E21B  43/26		ܤޤϳܤ뤳Ȥˤ	by forming crevices or fractures	19716
E21B  43/263		ȯʪѤΡΣ	using explosives	1380
E21B  43/267		٤뤳Ȥˤܤ䶯ΡΣ	reinforcing fractures by propping	5936
E21B  43/27		忩Τβʡ㡥λѤˤ	by use of eroding chemicals, e.g. acids	3098
E21B  43/28		úǰʳιʪϲ㡥륫ޤϻοкޤˤΡʣţ£ͥˡΣ	Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent(<b>E21B43/241</b> takes precedence)	2239
E21B  43/285		ʪͻ㡥βʣţ£ͥˡΣ	Melting minerals, e.g. sulfur(<b>E21B43/24</b> takes precedence)	138
E21B  43/29		ʪηդκμ衤㡥ΥλѤˤΡΣ	Obtaining a slurry of minerals, e.g. by using nozzles	314
E21B  43/295		ʪΥ㡥ǳκʪΤΤΡΣ	Gasification of minerals, e.g. for producing mixtures of combustible gases(<b>E21B43/243</b> takes precedence)	1356
E21B  43/30		̤ͤΥѥ㡥ͤΥڡ󥰤ŬˤΡΣ	Specific pattern of wells, e.g. optimising the spacing of wells	3889
E21B  43/32		ޤϿα߿ݡʤͤμϤǤΥޤϿα߿ηɻߡΣ	Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells	968
E21B  43/34		ͤˤ껺Ф줿ʪʬΥΤ֡Σ	Arrangements for separating materials produced by the well	6983
E21B  43/36		ʬΥ֡ʣţ£ͥˡΣ	Underwater separating arrangements(<b>E21B43/38</b> takes precedence)	828
E21B  43/38		ͤˤΡΣ	in the well	2925
E21B  43/40		ʬΥʪκ˴ϢʬΥѤΡΣ	Separation associated with re-injection of separated materials	1640
E21B  44/00		﹦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	10627
E21B  44/02		ġμưʣţ£ͥˡΣ	Automatic control of the tool feed(<b>E21B44/10</b> takes precedence)	1716
E21B  44/04		ư֤Υȥ륯˱ΡΣ	in response to the torque of the drive	610
E21B  44/06		ư֤βưήΤήޤϰϤ˱ΡΣ	in response to the flow or pressure of the motive fluid of the drive	575
E21B  44/08		׷ġư㡥פޤȿư礭˱ΡΣ	in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil	170
E21B  44/10		̤ġ뤬夲줿μư֡Σ	Arrangements for automatic stopping when the tool is lifted from the working face	38
E21B  45/00		﹦֤ȷ®٤¬	Measuring the drilling time or rate of penetration	1499
E21B  47/00		ޤϰͤĴʺ﹦ήΤΰϤޤήδƻ룲ˡΣ	Survey of boreholes or wells(monitoring pressure or flow of drilling fluid <b>E21B21/08</b>)	30417
E21B  47/001		ѡΣ	for underwater installations	501
E21B  47/002		ܻ븡ˤΡΣ	by visual inspection	2993
E21B  47/003		ͤޤϹѤꤹΡΣ	Determining well or borehole volumes	229
E21B  47/005		ȸǲʼޤϥ٥δƻޤϸΣ	Monitoring or checking of cementation quality or level	1310
E21B  47/007		ѥץȥ󥰤ޤϥ󥰤αϤ¬ʸ夷ʬΥѥפõΤ٤ΤΣţ£ˡΣ	Measuring stresses in a pipe string or casing(for locating blocked portions of pipes <b>E21B47/09</b>)	621
E21B  47/008		ۡݥץƥδƻ롤㡥֥ݥץա׾֤θФΤΤΡΣ	Monitoring of down-hole pump systems, e.g. for the detection of "pumped-off" conditions	1060
E21B  47/009		󥰥ӡݥץƥδƻΣ	Monitoring of walking-beam pump systems	509
E21B  47/01		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	4783
E21B  47/013		ɥӥåȤ¬֤ٻ뤿äŬ礷֡Σ	Devices specially adapted for supporting measuring instruments on drill bits	379
E21B  47/017		¬֤ݸΣ	Protecting measuring instruments	3097
E21B  47/02		Ф̤η	Determining slope or direction	2516
E21B  47/022		Ρ㡥ϼѤΡΣ	of the borehole, e.g. using geomagnetism	4585
E21B  47/0224		Ͽ̤ޤϲʤѤΡΣ	using seismic or acoustic means	179
E21B  47/0228		żͥ륮ޤϤΤθдѤΡΣ	using electromagnetic energy or detectors therefor	416
E21B  47/0232		ʤȤ⥨ͥ륮ΣĤޤϤθдΣĤɽ̤ޤϤ֤ΡΣ	at least one of the energy sources or one of the detectors being located on or above the ground surface	73
E21B  47/0236		ҤѤΡΣ	using a pendulum	106
E21B  47/024		֤ΤΡʹηФ̤ηţ£ˡΣ	of devices in the borehole (determining slope or direction of the borehole <b>E21B47/022</b>)	1920
E21B  47/026		ؤΤΤ	of penetrated ground layers	470
E21B  47/04		ޤϱհ̤¬Σ	Measuring depth or liquid level	4240
E21B  47/047		հ̡ޡѤޤϱհ̤¬ţ£ˡΣ	Liquid level  (measuring depth or liquid level using radioactive markers <b>E21B47/053</b>)	1956
E21B  47/053		ޡѤΡΣ	using radioactive markers	48
E21B  47/06		٤ޤϰϤ¬Σ	Measuring temperature or pressure	12747
E21B  47/07		١Σ	Temperature	3898
E21B  47/08		ľ¤ޤϴϢˡ¬Σ	Measuring diameters or related dimensions at the borehole	1945
E21B  47/085		ռͼʤѤΡ㡥żΣ	using radiant means, e.g. acoustic, radioactive or electromagnetic	357
E21B  47/09		ޤϰʪΤΰ֤ޤϷꡨѥפμͳʤޤĺɤ줿ʬμ̡Σ	Locating or determining the position of objects in boreholes or wells; Identifying the free or blocked portions of pipes	2864
E21B  47/092		۾ʬۤθФˤΡΣ	by detecting magnetic anomalies	463
E21B  47/095		۾θΤˤΡ㡥ں̮ưѡΣ	by detecting acoustic anomalies, e.g. using mud-pressure pulses	230
E21B  47/098		ѥåѤΡ㡥ؤߤޤϷθΡΣ	using impression packers, e.g. to detect recesses or perforations	80
E21B  47/10		ήΤϳСޤϰưõΡΣ	Locating fluid leaks, intrusions or movements	6065
E21B  47/103		Ǯ¬ѤΡΣ	using thermal measurements	238
E21B  47/107		ʤѤΡΣ	using acoustic means	479
E21B  47/11		ȥ졼ѤΡǽѤΡΣ	using tracers; using radioactivity	1256
E21B  47/113		ŵɽѤΡѤΡΣ	using electrical indications; using light radiation	322
E21B  47/117		ϳθС㡥ɺϳ졤ϻˤΡΣ	Detecting leaks, e.g. from tubing, by pressure testing	876
E21B  47/12		ͤ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	10528
E21B  47/125		ŵƳΤȤ̤ѤΡżͥ륮ˤΣţ£ˡΣ	using earth as an electrical conductor (by electromagnetic energy <b>E21B47/13</b>)	174
E21B  47/13		żͥ륮ˤΡ㡥̵ӡΣ	by electromagnetic energy, e.g. of radio frequency range	2311
E21B  47/135		ȡ㡥ֳޤϻ糰ѤΡΣ	using light waves, e.g. infrared or ultraviolet waves	706
E21B  47/14		ȤѤΡΣ	using acoustic waves	2108
E21B  47/16		ɥ륹ȥ󥰤ޤϥ󥰤̤ΡΣ	through the drill string or casing	815
E21B  47/18		ͤήΤ̤ΡΣ	through the well fluid	2238
E21B  47/20		ťȤĴˤΡ㡥Ϣ³ĴˤΡΣ	by modulation of mud waves, e.g. by continuous modulation	239
E21B  47/22		ɥѥפȴĤδ֤ΰƨۤѤťڥѥ륹ˤΡΣ	by negative mud pulses using a pressure relief valve between drill pipe and annulus	45
E21B  47/24		ɥѥǤήۤѤץ饹ťڥѥ륹ˤΡΣ	by positive mud pulses using a flow restricting valve within the drill pipe	115
E21B  47/26		ۡ˥ǡǼΡ㡥꡼ޤϵϿôΤˤΡΣ	Storing data down-hole, e.g. in a memory or on a record carrier	1151
E21B  49/00		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	21335
E21B  49/02		ھεŪμˤΡΣ	by mechanically taking samples of the soil	3922
E21B  49/04		ȯʪѤΡɤ˿ȯΤѤΡΣ	using explosives in boreholes; using projectiles penetrating the wall	181
E21B  49/06		¦ɤ﹦빩ޤϥ쥤ѤѤ	using side-wall drilling tools or scrapers	717
E21B  49/08		ޤϰǡήλμ褹ޤήΤ뤿ΤΡΣ	Obtaining fluid samples or testing fluids, in boreholes or wells	8477
E21B  49/10		¦ѤήΥץ顼ޤϥƥѤΡΣ	using side-wall fluid samplers or testers	1125
