EP0765427A1 - Gelenkiges bohrwerkzeug - Google Patents

Gelenkiges bohrwerkzeug

Info

Publication number
EP0765427A1
EP0765427A1 EP95923382A EP95923382A EP0765427A1 EP 0765427 A1 EP0765427 A1 EP 0765427A1 EP 95923382 A EP95923382 A EP 95923382A EP 95923382 A EP95923382 A EP 95923382A EP 0765427 A1 EP0765427 A1 EP 0765427A1
Authority
EP
European Patent Office
Prior art keywords
tool
tool body
hollow shaft
ball joint
drilling
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
EP95923382A
Other languages
English (en)
French (fr)
Other versions
EP0765427B1 (de
Inventor
André Leroy
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0765427A1 publication Critical patent/EP0765427A1/de
Application granted granted Critical
Publication of EP0765427B1 publication Critical patent/EP0765427B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/05—Swivel joints
    • 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
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
    • E21B17/1064—Pipes or rods with a relatively rotating sleeve

Definitions

  • the invention relates to a tool for drilling oil, gas or geothermal wells, driven in rotation, either from the surface by a rotary system of rods and drill-rods, or by a downhole motor.
  • the tool has two main organs.
  • the first is a hollow shaft which is assembled by one of its ends either to the last rod of the train, or to the shaft of the engine by which the drilling mud must then be brought.
  • drive member we will call “drive member” in both cases, the rod or the motor shaft to which the hollow shaft belonging to the tool is assembled. It is also through this drive member that the advance force is transmitted to the tool.
  • the second main member of the tool is a blind tubular body, hereinafter called “tool body”, the closed end of which carries the cutting edges externally, and the open end of which allows the hollow shaft to pass.
  • the main organs are in spherical connection and this connection is materialized by a ball joint; we call “center of the patella” the center common to the two spherical surfaces which it puts in contact.
  • This spherical connection requires the use of a second connection allowing the transmission of the drilling torque from the hollow shaft to the body of the tool while respecting the relative freedoms of these two members, arising from their spherical connection.
  • This tool has a relatively slender body, the ball joint is located at the very bottom of the blind end of the tool body which carries at its other end a stabilizer, and the transmission system, separate from the ball joint, is located on the same side of this ball joint as the stabilizer.
  • the distance between the center of the ball joint and the stabilizer, in a precise way between this center and the plane perpendicular to the axis of the tool located halfway up this stabilizer, must be at least of the order of 2.5 times the diameter of the tool body, and the greater the greater the lateral aggressiveness of the cutting edges of the tool.
  • the transmission systems used in the tool that is the subject of the invention are distinguished from those used in articulated tools known by the fact that they are external to the ball joint, the bearing surfaces of which are thus avoided, and by the fact that they comprise, between the hollow shaft and the body of the tool, an intermediate element surrounding the hollow shaft.
  • This element is connected to each of the main members by special teeth when this element is rigid, or by assembly when it is deformable (flexible shell). In all cases, we will say that it is a "variable configuration" transmission.
  • the axis of the hollow shaft assembled with the drive member is assumed to be maintained by the latter in the axis of the well already drilled and the tool is assumed, owing to the conditions of cut that it meets, tend to initiate a movement of precession.
  • the position of the center of the patella which identifies the top of the precession cone, allows the tool body to react spontaneously to the inclination that results for the cutting force: this effort itself tends to reduce the tool body in coaxiality with the hollow shaft, with a sensitivity all the greater as the center of the ball joint is located further from the contact surfaces of this ball joint, in the direction of the advance movement of the tool.
  • the action of the stabilizer prevents the relative inclination of the tool from becoming sufficient to cause contact between the hollow shaft and the tool body at the open end of the latter, before action has taken place. the spontaneous reaction of the tool.
  • a deformation of the drive member is supposed to cause the axis of the hollow shaft to tilt relative to the axis of the well.
  • the axis of the hollow shaft then describes with respect to the axis of the well a cone whose apex coincides with the center of the ball joint.
  • the tool body tends to follow the hollow shaft in this movement but the stabilizer prevents it, in a particularly effective way if the stabilizer is in rotoidal connection with the tool body: the latter therefore continues to progress in the axis of the well, independently of the disturbed movement that the deformed drive member imposes on the hollow shaft.
  • the dynamic behavior of the tool is further improved and the distance between the center of the ball joint is increased for a given slenderness of the tool body. the stabilizer.
  • the single figure shows by way of non-limiting example a drilling tool according to the invention.
  • the hollow shaft 1 is assembled at one of its ends to the drive member, not shown, by means of the conical thread 3.
  • the hollow shaft 1 is connected spherical with the tool body 2 by a ball joint, located in the closed end of the tool body and consisting of the element 4 carrying the male surface and integral with the tool body as well as the element 5 carrying the female surface integral with the hollow shaft.
  • the male and female contact surfaces, in conformity in the patella, are centered at point A which we have called the center of the patella.
  • the hollow shaft 1 and the tool body 2 are connected a second time by the sleeve 6 which carries a right internal toothing 7 and a convex external toothing 8.
  • the right internal toothing 7 of the sleeve meshes with the convex external toothing 9, of the same number of teeth, machined on the part 10 integral with the hollow shaft and the toothing curved outer 8 of the sleeve meshes with the right inner toothing 11, of the same number of teeth, secured to the tool body.
  • This second connection between the hollow shaft and the tool body is therefore in the form of a deformable coupling, the sleeve 6 having an additional point contact through the surface 12 with the part 5 of the ball joint, so as to limit forward the absolute translation of the sleeve.
  • the spherical connection produced by the ball 4.5 being here unilateral, that is to say capable of transmitting, from the hollow shaft to the tool body a force directed in the direction of the advance movement only, a contact substitution is provided between the surface 13 linked to the hollow shaft and the surface 14 linked to the tool body, during the descent or ascent of the tool, to allow, during these operations, the transmission of a force acting from the hollow shaft to the tool body in the opposite direction to that which the ball joint can transmit.
  • Two sealing systems using the membranes 15 and 16 respectively isolate from the drilling mud, between the hollow shaft and the tool body, an oil chamber 17 containing the lubricant essential for the ball joint and for the coupling.
  • the membrane 15 front membrane
  • This membrane which separates the downward flow of mud (at high pressure) from the lubricant contained in the oil chamber, is in conformity with metallic surfaces over most of its extent, and it is free over a range of its surface just sufficient for it to have the deformability necessary for the relative deflections of the hollow shaft relative to the tool body during the operation of the tool, and during its descent or ascent, to allow contact between surfaces 13 and 14.
  • the membrane 16 (rear membrane), the shape of which in the free state is that of a truncated cone, is attached by the perimeter of its small base to the outer surface of the hollow shaft, and by the perimeter of its large base to the inner surface of the tool body, so that the small base is located on the side of the open part of the tool body.
  • Lateral openings such as 18 are drilled in the body of the tool, at the level of the membrane 16, so as to bring to this location the flow of rising mud inside the body of the tool, and thus to create, along the rear face of the membrane, a sweeping effect preventing any sedimentation of hard bodies near this membrane.
  • the tool comprises a stabilizer 19 in the vicinity of the open end of the tool body. In the embodiment illustrated here, this stabilizer 19 is in rotoidal connection with the tool body by means of the bearings 20 and 21, lubricated separately, with grease, during assembly and maintenance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Dowels (AREA)
EP95923382A 1994-06-15 1995-06-14 Gelenkiges bohrwerkzeug Expired - Lifetime EP0765427B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9407551 1994-06-15
FR9407551A FR2721346B1 (fr) 1994-06-15 1994-06-15 Outil articulé pour le forage de puits pétroliers, gaziers ou géothermiques.
PCT/FR1995/000779 WO1995034741A1 (fr) 1994-06-15 1995-06-14 Outil articule de forage

Publications (2)

Publication Number Publication Date
EP0765427A1 true EP0765427A1 (de) 1997-04-02
EP0765427B1 EP0765427B1 (de) 1998-08-12

Family

ID=9464425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95923382A Expired - Lifetime EP0765427B1 (de) 1994-06-15 1995-06-14 Gelenkiges bohrwerkzeug

Country Status (8)

Country Link
US (1) US5836407A (de)
EP (1) EP0765427B1 (de)
CA (1) CA2190658C (de)
DE (1) DE69504070T2 (de)
FR (1) FR2721346B1 (de)
NO (1) NO965359L (de)
RU (1) RU2133814C1 (de)
WO (1) WO1995034741A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9402216D0 (en) * 1994-02-04 1994-03-30 Bp Exploration Operating Drilling bit assembly and apparatus
FR2813340B1 (fr) * 2000-08-29 2002-12-06 Geoservices Dispositif pour deplacer radialement deux organes l'un par rapport a l'autre et dispositif de forage en comportant application
US7658244B2 (en) * 2002-07-26 2010-02-09 Wirth Maschinen-Und Bohrgerate-Fabrik Gmbh Device for advancing drillings in the ground
WO2012048458A1 (zh) * 2010-10-12 2012-04-19 石家庄中煤装备制造股份有限公司 组合钻具

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR77179E (fr) * 1960-02-17 1962-01-27 Soletanche Procédé de forage utilisant la méthode dite <à circulation inverse> et dispositifs pour la mise en oeuvre de ce procédé
GB2190411B (en) * 1986-05-16 1990-02-21 Shell Int Research Apparatus for directional drilling.
US5503236A (en) * 1993-09-03 1996-04-02 Baker Hughes Incorporated Swivel/tilting bit crown for earth-boring drills
US5472057A (en) * 1994-04-11 1995-12-05 Atlantic Richfield Company Drilling with casing and retrievable bit-motor assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9534741A1 *

Also Published As

Publication number Publication date
CA2190658A1 (fr) 1995-12-21
FR2721346A1 (fr) 1995-12-22
NO965359L (no) 1997-02-13
NO965359D0 (no) 1996-12-13
DE69504070D1 (de) 1998-09-17
RU2133814C1 (ru) 1999-07-27
EP0765427B1 (de) 1998-08-12
FR2721346B1 (fr) 1996-08-30
CA2190658C (fr) 1999-09-28
DE69504070T2 (de) 1999-05-27
WO1995034741A1 (fr) 1995-12-21
US5836407A (en) 1998-11-17

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