EP0331978A2 - Tige de forage pour marteau hydraulique de forage de fond de puits - Google Patents

Tige de forage pour marteau hydraulique de forage de fond de puits Download PDF

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Publication number
EP0331978A2
EP0331978A2 EP89103122A EP89103122A EP0331978A2 EP 0331978 A2 EP0331978 A2 EP 0331978A2 EP 89103122 A EP89103122 A EP 89103122A EP 89103122 A EP89103122 A EP 89103122A EP 0331978 A2 EP0331978 A2 EP 0331978A2
Authority
EP
European Patent Office
Prior art keywords
channel
tube
follow
inner tube
end position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89103122A
Other languages
German (de)
English (en)
Other versions
EP0331978A3 (en
EP0331978B1 (fr
Inventor
Herbert Burgdorf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Salzgitter Maschinenbau GmbH
Original Assignee
Salzgitter Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Salzgitter Maschinenbau GmbH filed Critical Salzgitter Maschinenbau GmbH
Publication of EP0331978A2 publication Critical patent/EP0331978A2/fr
Publication of EP0331978A3 publication Critical patent/EP0331978A3/de
Application granted granted Critical
Publication of EP0331978B1 publication Critical patent/EP0331978B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/18—Pipes provided with plural fluid passages
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • the invention relates to a follow-up drill pipe according to the preamble of claim 1.
  • each follow-up drill rod 60a, 60b has an automatic valve 65 for the pressure fluid in the inner channel 30 and a further automatic valve 65 for the return fluid in the intermediate channel 40 at each end .
  • all four valves 65 open immediately, so that a certain amount of liquid can escape.
  • liquid leaks are inevitable when separating two extension boring bars 60a, 60b.
  • the free flow cross section of the inner channel 30 and the intermediate channel 40 becomes unfavorable through the valves 65 decreased.
  • valves 65 are complicated and of relatively low mass, so that liquid vibrations in the inner (30) and intermediate channels 40 are transmitted to the valves 65 by the pulsating down-hole hammer and can damage the valves.
  • the follow-up drill rod 60 In the event of a leak on a follow-up drill rod 60a, 60b, the follow-up drill rod 60 must be pulled out of the borehole and the damage site has to be laboriously searched for with continuous loss of fluid.
  • the invention has for its object to simplify the NachsetzbohrgestCode and its handling and to limit leakages to a minimum.
  • the hydraulic fluid drives the down-the-hole hammer and can be made available and returned in a sufficient amount of time because, according to the invention, relatively large free cross sections are created both in the inner channel and in the intermediate channel. As a result, the diameter of the additional drill pipe can be kept relatively small for a given power.
  • the valve assembly at the ends of each post boring bar has been significantly improved. Part of the valve device are the entire inner tubes, which are only axially displaced with one another after the complete coupling of the supplementary boring bars and only then release the flow paths for pressure fluid and return fluid. Because of the relatively large mass of the inner tubes as moving valve parts, these are practically not influenced by operating vibrations in the liquid columns.
  • the hydraulic fluid reaches the downhole hammer in a simple manner.
  • each valve device is automatically closed when the add-on drill rod is uncoupled.
  • the coupling sleeve can e.g. be screwed into the intermediate pipe and allows a quick and easy replacement of all essential seals in the area of the valve device. Maintenance and repair of the extension boring bars are greatly facilitated.
  • the extension of the inner tube according to claim 10 results in a resulting hydraulic holding force by the hydraulic fluid in the coupled state. It is coupled and uncoupled without hydraulic fluid flowing through. This protects the seals and prevents leaks.
  • Hydraulic fluid is particularly suitable as the actuating fluid.
  • the actuation of the valve devices is thus independent of the delivery pressure of the hydraulic fluid.
  • the flushing medium in particular Compressed air to be provided in sufficiently large flow cross sections.
  • the inner tubes as parts of the valve devices are also held in their second or opening position when there is a brief shutdown or drop in the delivery pressure of the pressure fluid.
  • the locking device helps to prevent the inner tubes from being influenced by operating vibrations in the liquid columns.
  • the handling is further secured and simplified.
  • FIG. 1 shows a follow-up drill rod 1, the movable parts of which are to the left of the longitudinal axis 2 in an uncoupled first end position and to the right of the longitudinal axis 2 in a coupled second end position.
  • a post drill rod 3 and an adjacent post are boring bar 3 'shown.
  • the individual parts of the add-on boring bars 3, 3 'and other, in Fig. 1, not shown add-on boring bars are identical, so that they are provided with the same reference numerals.
  • a connector 4 for a hydraulically driven down hole hammer 5 is attached, the main part of which has been omitted in Fig. 1, since it is of a known type.
  • Each post boring bar 3, 3 has an inner tube 7 enclosing an inner channel 6 for hydraulic fluid, an intermediate tube 9 defining an intermediate channel 8 for return fluid with the inner tube 7 and an outer channel 10 for a flushing medium, e.g. Compressed air, defining outer tube 11.
  • a flushing medium e.g. Compressed air
  • the flow directions of the aforementioned media are indicated with arrows in FIG. 1.
  • the hydraulic fluid is used to drive the down-the-hole hammer 5 and is returned as return fluid in the intermediate channel 8 after work there.
  • connection piece 12 With the lower end of the outer tube 11 of the extension boring bar 3 'a connection piece 12 is welded, which is screwed into a connecting sleeve 13 of the extension boring bar 3 with a conical, preferably multi-start thread.
  • the connecting piece 12 of the extension boring bar 3 is screwed into a connecting sleeve 14 of the connecting piece 4.
  • an outer tube 15 of the down-the-hole hammer 5 is screwed in a sealed manner in a manner known per se.
  • a housing 16 of the downhole hammer drill 5 is driven by the hydraulic fluid, a percussion piston 17 of the down hole hammer 5 out.
  • the percussion piston 17 is provided with a central bore 18 for the flushing medium.
  • the connecting sleeve 13 is formed in one piece with an upper part 19 of the intermediate tube 9 to simplify production.
  • the ordinary intermediate tube 9 is welded along a weld 20.
  • the outer tube 11 is welded to the connecting sleeve 13 along a weld seam 21.
  • four openings 22 are provided for the flushing medium, distributed over the circumference.
  • the intermediate tube 9 is held at least approximately the same radial distance from the outer tube 11 by means not shown.
  • Such means are e.g. disclosed in DE Offenlegungsschrift 30 15 695.
  • the intermediate pipe 9 of the extension boring bar 3 protrudes from the bottom of the connecting piece 12 and into a receiving opening 23 of the connecting piece 4, against which it is sealed by a seal 24.
  • the coupling sleeve 26 is screwed along a thread 27 into the upper part 19 until its lower end comes to rest in a shoulder 28 of the upper part 19.
  • the coupling sleeve is sealed from the upper part 19 by a seal 29.
  • the coupling sleeve 26 forms part of the intermediate tube 9 and has on its inside a first connecting channel 30 which extends in the circumferential direction as an annular groove.
  • annular groove-like second connecting channel 31 is also formed, which is constantly connected on the one hand to the intermediate channel 8 and on the other hand to four holes 32 in the coupling sleeve 26 which are evenly distributed over the circumference.
  • Each inner tube 7 can be displaced in the direction of the longitudinal axis 2 relative to the intermediate tube 9 between the first end position shown on the left of the longitudinal axis 2 in FIG. 1 and the second end position shown on the right of the longitudinal axis 2 in FIG. 1.
  • Each inner tube 7 has an impermeable end wall 33 and 34 and a valve head 35 and 36 at each end.
  • Each valve head is provided with four openings 37 and 38 which are evenly distributed over the circumference.
  • valve head 35 In the first end position, the valve head 35 is sealed off from the coupling sleeve 26 of the intermediate tube 9 by seals 39 and 40. In the first end position, the valve head 36 is also sealed by seals 41 and 42 with respect to the lower end of the intermediate tube 9 of its own extension drill rod 3, 3 '.
  • valve head 35 is sealed by the seal 40 with respect to the coupling sleeve 26 of the intermediate tube 9 of its own adjustment drill rod 3, 3 '.
  • the other valve head 36 is sealed by the seal 42 either with respect to the coupling sleeve 26 of the intermediate pipe 9 of the next post-boring bar 3 or with a receiving opening 43 of the connecting piece 4.
  • the end walls 33, 34 of adjacent post-boring bars 3, 3 ' abut one another, the lateral openings 37, 38 of the adjacent valve heads 35, 36 are connected to one another via the first connecting channel 30 in the coupling sleeve 26.
  • the inner channels 6 of adjacent drill rods 3, 3 ' are connected to one another in this second end position.
  • the openings 38 of the valve head 36 of the lowermost add-on drill rod 3 are connected via an annular recess 44 in the receiving opening 43 to a feed channel 45 of the connecting piece 4.
  • the hydraulic fluid is fed to the down-the-hole hammer 5 in a manner known per se .
  • Each inner tube 7 is in the first end position with an outer projection 46 on a stop surface 47 of the coupling sleeve 26 of the inner tube 9 of its own extension drill rod 3, 3 '.
  • the outer projection 46 is designed as an annular collar which is interrupted several times on its circumference in order to allow the return liquid to pass in the second end position.
  • Each inner tube 7 is biased into the first end position by a return spring 48.
  • the return spring 48 is supported on the one hand on an outer support surface 49 of the inner tube 7 and on the other hand on an inner support 50 of the intermediate tube 9.
  • the inner support 50 is located at the transition from the upper part 19 to the ordinary intermediate pipe 9 and has axial openings 51 for the return liquid.
  • a stop sleeve 52 is also inserted for a lower travel limitation of the outer projection 46.
  • the holes 32 are in the coupling sleeve 26 through the seal 39 of the valve head 35 its own post boring bar 3, 3 'sealed so that return liquid can not leak.
  • the holes 32 are connected through the valve head 36 of the adjacent post boring bar 3 'via a third connecting channel 53 with the intermediate channel 8 of the adjacent post boring bar 3'.
  • the return liquid can flow out through sufficiently large cross sections.
  • the coupling sleeve 26 has at its outer axial end an insertion funnel 54 for the intermediate tube 9 of the adjacent post boring bar 3 '. This facilitates the coupling of the drill rods 3, 3 'together.
  • Fig. 2 details of the extension drill string 1 are shown enlarged.
  • FIG. 3 shows the lower end of the down-the-hole hammer 5 following the lower end of FIG. 1.
  • a guide sleeve 55 for an insertion end 56 of an impact drilling tool 57 is screwed onto the housing 16.
  • the percussion drilling tool 57 has a flushing channel system 58 which is supplied with flushing medium through the bore 18.
  • Fig. 4 shows practically the upper end of the extension drill rod 1.
  • a connector 59 for an output shaft 60 of a rotary drive 61, only indicated, is shown.
  • the lower end of the connecting piece 59 which is not shown in FIG. 4, is designed in the same way as the lower end of the adjacent extension drill rod 3 'shown in FIG. 1'.
  • the length of the drill rods 3, 3 ' can be, for example, 6 to 7m.
  • a connecting piece 63 of the output shaft 60 is screwed into an upper connecting sleeve 62 of the connecting piece 59.
  • the output shaft 60 runs in a non-rotatable hub 64 of a rotary feedthrough 65.
  • the output shaft 60 is provided with only indicated, known longitudinal teeth which are in engagement with a hollow shaft gear of the rotary drive 61, which is also known per se.
  • the rotary drive 61 can be advanced and retracted in a manner known per se along a mount (not shown). When the rotary drive 61 is advanced, in addition to the rotation about the longitudinal axis 2 the downward drilling rod 1 is given a downward thrust. On the other hand, when the rotary drive 61 is pulled back, the additional drill rod 1 is pulled out of the borehole.
  • a central, concentric chamber 66 is formed in the output shaft 60.
  • the chamber 66 extends from the end 67 of the output shaft 60 facing the connection piece 59 into the hub 64.
  • a first end 68 of an intermediate tube 69 is kept sealed in the chamber 66 by a seal 70.
  • the intermediate tube 69 extends through the creation of an outer channel 71 for the flushing medium through an outer tube 72 of the connector 59.
  • a second, not shown, lower end of the intermediate tube 69 is, as mentioned, corresponding to the lower end of the intermediate tube 9 of the extension boring bars 3, 3 '.
  • An inner tube 74 extends into the chamber 66 and through the intermediate tube 69, creating an intermediate channel 73 for the return liquid.
  • the inner tube 74 defines an inner channel 75 for the pressure fluid and is in the direction of the longitudinal axis 2 relative to the intermediate tube 69 between the aforementioned first End position and the aforementioned second end position can be moved.
  • first lower end of the inner tube 74 is, as mentioned, formed in the same way as the lower end of the inner tube 7 of the drill rods 3, 3 'and acts in the same way in the two end positions with the second end of the intermediate tube 69 together.
  • a second end 76 of the inner tube 74 is sealed on the outside from a wall 77 of the chamber 66 by seals 78 and 79 and can be pushed into the second end position by an actuating fluid.
  • the hydraulic fluid is used as the actuating fluid.
  • the hydraulic fluid is supplied to the hub 64 at a hydraulic fluid connection 80, sealed by seals 81 and 82.
  • the second end 76 of the inner tube 74 is sealed off from the wall 77 by a bushing 83 which is inserted into the chamber 66 and carries the seals 78, 79 and is guided in the radial direction.
  • the socket 83 is supported at the bottom on the first end 68 of the intermediate tube 69 and at the top on a spacer sleeve 84.
  • a pressure fluid space 85 is defined by the socket 83 within the chamber 66 and is connected to the pressure fluid connection 80 via bores 86 in the output shaft 60.
  • a return space 87 of the chamber 66 which cannot be acted upon by the pressure fluid is constantly connected on the one hand to the intermediate channel 73 and on the other hand to a return connection 88 of the hub 64.
  • the return port 88 is sealed off from the output shaft 60 by seals 89 and 90 and is connected to the return chamber 87 by bores 91 in the output shaft 60.
  • the inner channel 75 widens towards the second end 76 of the inner tube 74.
  • An annular end edge 92 of the second end 76 interacts as a valve body with a valve seat 94 which is movably mounted in the direction of the longitudinal axis 2 and is biased by a spring 93 in an opening direction.
  • the valve seat 94 has radial webs 95 on its upper side, which always keep the valve seat 94 at a distance from an end wall 96 of the chamber 66. Thus, the upper surface of the valve seat 94 is always connected to the pressure fluid connection 80.
  • the valve seat 94 moves against a stop 98, which is axially stationary relative to the output shaft 60, on the upper side of the bush 83.
  • the annular end edge 92 is lifted off the valve seat 94 and the valve seat 94 by the spring 93 moved back to its starting position in the opening direction.
  • the hydraulic fluid can in this way Inflow inner channel 75. Because of the expansion of the inner tube 74 at its upper end, the pressure fluid exerts a downward resulting holding force on the strand of the inner tube 74, 7. This holding force holds the strand of the inner tubes 74, 7 in its second end position against the force of the return springs 48, 97.
  • flushing channels 99 are provided in the wall of the output shaft 60, which connect a flushing connection 100 of the hub 64, sealed by seals 101 and 102, to the outer channel 71 of the connecting piece 59.
  • the second end position of the string of inner tubes 74, 7 held by the pressure fluid in the aforementioned manner is secured by a mechanical locking device 103. Without the locking device 103, if the pressure fluid was briefly switched off or the pressure of the pressure fluid dropped, the strand of the inner tubes 74, 7 would immediately move upward in the direction of the first end position under the action of the return springs 48, 97. When the hydraulic fluid pressure was rebuilt, the strand of inner tubes 74, 7 would then move again in the direction of the second end position. Such axial movements of the inner tubes 74, 7 due to pressure fluctuations or failures are undesirable because they lead to unnecessary wear and the supply of hydraulic fluid to the down-the-hole hammer 5. The locking device 103 prevents these disadvantages.
  • the locking device 103 has an axially fixed at the second end 76 of the inner tube 74 the output shaft 60 extends through rod 104.
  • the rod 104 is sealed off from the output shaft 60 by a seal 105.
  • the valve seat 94 is slidably mounted on the rod 104.
  • a bushing 106 is screwed with an outer, radial groove 107 formed as an annular groove.
  • a plurality of locking elements 108 designed as balls and locked with respect to the output shaft 60, engage in the recess 107.
  • the locking elements 108 are actuated by a locking sleeve 109 held displaceably on the output shaft 60.
  • the locking sleeve 109 is biased by a spring 110 into a locking position activating the locking elements 108.
  • the locking sleeve 109 has on the inside an extension 111 designed as an annular groove, which receives the locking elements 108 in an axial release position of the locking sleeve 109.
  • the locking sleeve 109 is drawn in its lower, locking position on the right side of the longitudinal axis 2.
  • the locking is only released when the rotary drive 61 is retracted upwards in FIG. 4.
  • the rotary drive 61 abuts a lower stop surface 112 of the locking sleeve 109 and pushes the locking sleeve 109 upwards until the lock is released.
  • the pressure fluid at the pressure fluid connection 80 is normally already switched off, so that the inner tubes 74, 7 can immediately move into their first end position under the action of the return springs 48, 97.
  • the elements of the locking device 103 then take the one on the left in FIG. 1 drawn relative positions.
  • the lower end of the rod 104 has a head 113 which extends outward into contact with the inner tube 74 and is fixed there in the axial direction by a locking ring 114.
  • the head 113 has axial openings 115 for the pressure fluid.
  • Fig. 5 shows important items of the drill rod 3 and the neighboring drill rod 3 'in a separate representation.
  • Each inner tube 7 is provided below the openings 37 with a shoulder 116, from which the inner tube 7 has a larger diameter downwards.
  • the mechanical locking device 103 (FIG. 4) can be relieved during operation of the supplementary drill rod 1.
  • FIG. 6 shows a different type of axial displacement of the inner tube 74 compared to FIG. 4.
  • the same parts as in FIG. 4 are provided with the same reference numbers in FIG. 6.
  • the second end 76 of the inner tube 74 is designed as a piston and is guided in a sealed manner in a cylinder space 117 of the chamber 66 by a seal 118.
  • a stepped, annular end face 119 of the second end 76 is continuously connected to an actuating fluid connection 120 of the hub 64.
  • the end of the rod 104 of the locking device 103 is screwed into the second end 76 from above.
  • the strand can be moved axially out of the inner tubes 74, 7 by controlling the actuating fluid at the actuating fluid connection 120 independently of the pressure fluid at the pressure fluid connection 80.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP89103122A 1988-03-05 1989-02-23 Tige de forage pour marteau hydraulique de forage de fond de puits Expired - Lifetime EP0331978B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3807321 1988-03-05
DE3807321A DE3807321C1 (fr) 1988-03-05 1988-03-05

Publications (3)

Publication Number Publication Date
EP0331978A2 true EP0331978A2 (fr) 1989-09-13
EP0331978A3 EP0331978A3 (en) 1990-04-11
EP0331978B1 EP0331978B1 (fr) 1991-11-13

Family

ID=6349000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103122A Expired - Lifetime EP0331978B1 (fr) 1988-03-05 1989-02-23 Tige de forage pour marteau hydraulique de forage de fond de puits

Country Status (4)

Country Link
EP (1) EP0331978B1 (fr)
JP (1) JPH0216288A (fr)
DE (2) DE3807321C1 (fr)
FI (1) FI891027A7 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0808987A3 (fr) * 1996-05-20 1999-09-29 Böhler Baugeräte GmbH Marteau de fond de puits hydraulique
CN113006680A (zh) * 2021-03-19 2021-06-22 成都欧维恩博石油科技有限公司 一种低压耗扭力冲击钻井工具及破岩方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4027414C1 (en) * 1990-08-30 1992-02-13 Komotzki, Michael, 4708 Kamen, De Tubular rock bore drill stem - has concentric channels for fluids and has spring-loaded control valves
FI103688B1 (fi) * 1994-09-16 1999-08-13 Winrock Tech Ltd Oy Poratanko
US5586609A (en) * 1994-12-15 1996-12-24 Telejet Technologies, Inc. Method and apparatus for drilling with high-pressure, reduced solid content liquid
SE534395C2 (sv) * 2009-12-18 2011-08-09 Wassara Ab Anordning vid skarvning av dubbelväggiga borrör samt dubbelväggigt borrör
GB2481848A (en) * 2010-07-09 2012-01-11 Mine Innovation Ltd Self sealing drill rods
WO2014019154A1 (fr) * 2012-08-01 2014-02-06 思达斯易能源技术(集团)有限公司 Soupape de vidange de puits

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022865B1 (fr) * 1978-12-15 1984-08-01 Furukawakogyo Co.Ltd Foreuse de profondeur a commande hydraulique
DE3015695A1 (de) * 1980-04-24 1981-10-29 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter Bohrgestaenge fuer ein senkbohrwerkzeug
DE3309031C2 (de) * 1983-03-14 1986-07-31 Turkmenskij naučno-issledovatel'skij geologorasvedočnyj institut, Ašchabad Bohrgerät zum Erdbohren und Testen von Grundwasserhorizonten

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0808987A3 (fr) * 1996-05-20 1999-09-29 Böhler Baugeräte GmbH Marteau de fond de puits hydraulique
CN113006680A (zh) * 2021-03-19 2021-06-22 成都欧维恩博石油科技有限公司 一种低压耗扭力冲击钻井工具及破岩方法

Also Published As

Publication number Publication date
DE58900441D1 (de) 1991-12-19
EP0331978A3 (en) 1990-04-11
DE3807321C1 (fr) 1989-05-11
EP0331978B1 (fr) 1991-11-13
FI891027A7 (fi) 1989-09-06
JPH0216288A (ja) 1990-01-19
FI891027A0 (fi) 1989-03-03

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