EP0835360B1 - Hydraulische schubvorrichtung zur verwendung in einer bohrstange - Google Patents

Hydraulische schubvorrichtung zur verwendung in einer bohrstange Download PDF

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Publication number
EP0835360B1
EP0835360B1 EP96923945A EP96923945A EP0835360B1 EP 0835360 B1 EP0835360 B1 EP 0835360B1 EP 96923945 A EP96923945 A EP 96923945A EP 96923945 A EP96923945 A EP 96923945A EP 0835360 B1 EP0835360 B1 EP 0835360B1
Authority
EP
European Patent Office
Prior art keywords
thruster
drill string
spline
members
groove
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.)
Expired - Lifetime
Application number
EP96923945A
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English (en)
French (fr)
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EP0835360A1 (de
Inventor
Leon Van Den Steen
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.)
Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Priority to EP96923945A priority Critical patent/EP0835360B1/de
Publication of EP0835360A1 publication Critical patent/EP0835360A1/de
Application granted granted Critical
Publication of EP0835360B1 publication Critical patent/EP0835360B1/de
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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
    • 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
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E21B17/073—Telescoping joints for varying drill string lengths; Shock absorbers with axial rotation
    • 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
    • E21B44/00—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
    • E21B44/005—Below-ground automatic control systems

Definitions

  • the present invention relates to a hydraulic thruster for generating a thrust force to a drill bit located at the lower end of a drill string.
  • Hydraulic thrusters are generally applied in order to generate the desired weight on bit (WOB) which is the force exerted by the drill bit to the bottom of the borehole, or to isolate axial vibrations of the drill string from the bottom hole assembly.
  • WOB weight on bit
  • a considerable amount of axial force of the drill string is dissipated by friction between the drill string an the borehole wall, necessitating the application of a thruster to generate the desired WOB.
  • a common thruster consists of two telescoping members of which the fixed member is connected to an upper part of the drill string, and the travelling member is connected to the downhole assembly, whereby an axial spline/groove arrangement enables torque to be transmitted between the two members.
  • the thruster allows the downhole assembly to move axially relative to the upper part of the drill string.
  • the delivered thrust force is thus independent of the axial position of the drill string, and furthermore the thrust force is independent of the inclination of the drill string which may vary between a vertical orientation and a horizontal orientation.
  • the WOB can be accurately controlled as it depends on the effective cross-sectional area of the thruster and on the difference between the internal fluid pressure of the thruster and the external pressure thereof.
  • the thruster improves the dynamic behaviour of the assembly by the axial decoupling of the drill bit from the drill string.
  • US patent No. 4,901,806 discloses a device for use in a drill string to control the force applied to the drill bit (i.e. the WOB), and to decouple the axial vibrations acting on the drill string, which device therefore in effect forms a thruster.
  • the known thruster comprises a first member connectable to an upper part of the drill string and a second member connectable to a lower part of the drill string, said members being telescopingly arranged relative to each other and being capable of transmitting torsional forces between the upper member and the lower member during drilling, and a fluid passage passing through said members for drilling fluid flowing through the drill string towards the drill bit.
  • a problem associated with the known thruster is the occurrence of WOB variations due to variations of the drilling fluid pressure. Such pressure variations may occur, for example, due to pressure pulses generated during measurement while drilling. The fluid pressure variations tend to induce an outward telescoping movement of the device thereby causing variations in WOB. The problem is even more pronounced in case a downhole drilling motor is applied to drive the drill bit, which motor is located between the thruster and the drill bit. When the torque of the downhole motor increases, for example because of increasing frictional forces at the drill bit, the fluid pressure at the fluid inlet of the motor increases and thereby also the fluid pressure in the thruster. This leads to a further outwardly telescoping tendency of the thruster and consequently to an increasing WOB and corresponding torque at the motor.
  • the increased motor torque requires again an increased fluid pressure at the motor inlet and hence also at the thruster, leading to a further outwardly telescoping tendency of the thruster, etc.
  • This process leads to uncontrolled behaviour of the thruster/motor/bit combination and as a result the system may stall out.
  • the drilling process is thus severely hampered and damage to one or more of the components may result.
  • US-A-1,688,994 discloses a hydraulic thruster for generating a thrust force to a drill bit located at the lower end of a drill string, comprising a first member connectable to an upper part of the drill string and a second member connectable to a lower part of the drill string, said members being telescopingly arranged relative to each other and being capable of transmitting drill string torque during drilling, a fluid passage passing through said members for drilling fluid flowing through the drill string towards the drill bit, and means for generating an inward telescoping reaction of said members upon transmission of drill string torque during drilling, said means comprising at at least one helical spline provided at least one of said members and arranged in a corresponding helical groove provided at the other of said members, the spline and groove co-operating so as to transmit torque between the upper and lower part of the drill string during drilling.
  • the WOB of this known thruster depends on the bit/rock friction coefficient which shows large variations.
  • a hydraulic thruster for generating a thrust force to a drill bit located at the lower end of a drill string, comprising a first member connectable to an upper part of the drill string and a second member connectable to a lower part of the drill string, said members being telescopingly arranged relative to each other and being capable of transmitting drill string torque during drilling, a fluid passage passing through said members for drilling fluid flowing through the drill string towards the drill bit, and means for generating an inward telescoping reaction of said members upon transmission of drill string torque during drilling, characterized in that each spline (11) is arranged at a helix angle ⁇ relative to the longitudinal axis of the thruster, of between 0.8 arctan (r.A i /k m ) ⁇ ⁇ ⁇ 1.2 arctan (r.A i /k m ); wherein
  • a plurality of said splines and grooves are distributed regularly along the interface between the inner and outer member.
  • the thruster can be advantageously applied in a drill string including a downhole motor driving the drill bit, the downhole motor being arranged between the thruster and the drill bit.
  • a thruster 1 including a cylindrical outer member 3 and a cylindrical inner member 5 telescoping within the outer member 3, the inner member 5 having an annular piston 7 sealed by a suitable seal from the inner surface of the outer member 3.
  • the members 3, 5 have a common fluid passage 9 for drilling fluid to flow through the thruster 1.
  • the outer member 3 is connected at its upper end to the upper part of a drill string (not shown), and the inner member 5 is connected at its lower end to a lower part of the drill string including a hydraulic downhole motor (not shown).
  • the inner member 5 is provided at its outer surface with helical splines 11 extending from the piston 7 along a substantial portion of the length of the inner member 5.
  • the outer member 3 has a lower part 13 provided with helical grooves 15 which correspond to, and co-operate with, the splines 11 of the inner member 5.
  • the splines 11 and grooves 15 are oriented at a helix angle ⁇ relative to the longitudinal axis 14 of the thruster 1.
  • the helix orientation is such that during right hand rotation of the thruster 1 during drilling, when torque is transmitted from the outer member 3 to the inner member 5, the splines 11 and grooves 15 induce an inwardly telescoping reaction to the members 3, 5.
  • a i indicates the effective thruster area and r indicates the average radius of the splines/grooves.
  • T the motor torque.
  • equations (1) - (10) are exact. However in practice slight variations in some of the parameters may occur, and it has been found that adequate reduction of the dependency of WOB on the bit/rock friction is achieved if the helix angle ⁇ is selected between 0.8 arctan (r.A i /k m ) ⁇ ⁇ ⁇ 1.2 arctan (r.A i /k m ) More preferably the helix angle is between 0.95 arctan (r.A i /k m ) ⁇ ⁇ ⁇ 1.05 arctan (r.A i /k m )
  • the alternative thruster 20 has an inner member 22 provided with a set of helical splines of varying helix angle, and an outer member 26 provided with a set of corresponding grooves 28.
  • a plurality of guides 30 are positioned in corresponding recesses 32 of the thruster outer member 34, each guide 30 being provided with a groove 36 in which a spline 38 of the thruster inner member 40 is positioned.
  • Each guide 30 is rotatable around a radial shaft 42 fixedly connected to the outer member 34. In this manner it is achieved that the helix angle of the grooves 36 of the outer member 34 conforms to the varying helix angles of the splines 38.
  • the guides 30 instead of the guides 30 being connected to the outer member 34, the guides can alternatively be connected to the inner member, in which case the splines are provided at the outer member.
  • the hydraulic thruster can alternatively be arranged between the downhole motor and the drill bit.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Claims (8)

  1. Hydraulischer Schuberzeuger (1) zum Erzeugen einer Schubkraft auf eine Bohrkrone, die am unteren Ende eines Bohrstranges angeordnet ist, mit einem ersten Teil (3), das an einen oberen Abschnitt des Bohrstranges anschließbar ist, und einem zweiten Teil (5), das an einen unteren Abschnitt des Bohrstranges anschließbar ist, wobei die Teile teleskopierend zueinander angeordnet und in der Lage sind, ein Bohrstrangdrehmoment während des Bohrens zu übertragen, einem Fluiddurchlaß (9), welcher durch die Teile hindurchgeht, damit Bohrfluid durch den Bohrstrang zur Bohrkrone strömt, Mitteln zum Erzeugen einer einwärts-teleskopierenden Reaktion der beiden Teile bei der Übertragung eines Bohrstrangdrehmomentes während des Bohrens, welche Mittel zumindest eine wendelförmige Rippe (11) umfassen, die auf zumindest einem der genannten Teile vorgesehen und in einer korrespondierenden wendelförmigen Nut (15) liegt, welche auf dem anderen der genannten Teile vorgesehen ist, wobei die Rippe und die Nut zusammenwirken, um Drehmoment zwischen dem oberen Abschnitt und dem unteren Abschnitt des Bohrstranges während des Bohrens zu übertragen, und einem unten im Bohrloch arbeitenden Motor zum Antreiben der Bohrkrone, dadurch gekennzeichnet, daß jede Rippe (11) unter einem Helixwinkel β bezüglich der Längsachse des Schuberzeugers angeordnet ist, der im Bereich von 0,8 arctan(r.Ai/km) < β < 1,2 arctan(r.Ai/km) liegt, mit
    r = mittlerer Außenradius des Schuberzeugers;
    Ai = effektive Querschnitts-Schubfläche des Schuberzeugers;
    km = Motorkonstante, definiert als Motordrehmoment pro Einheit Druckabfall über den Motor.
  2. Schuberzeuger nach Anspruch 1, bei welchem das erste Teil ein Außenteil (3) und das zweite Teil ein Innenteil (5) bildet.
  3. Schuberzeuger nach Anspruch 2, mit mehreren Rippen (11) und Nuten (15), die regelmäßig über die Schnittstelle zwischen Innen- und Außenteil (3, 5) verteilt sind.
  4. Schuberzeuger nach Anspruch 3, bei welchem jede Rippe (11) unter einem Helixwinkel β bezüglich der Längsachse des Schuberzeugers angeordnet ist, der im Bereich von 0,95 arctan(r.Ai/km) < β < 1,05 arctan(r.Ai/km) liegt.
  5. Schuberzeuger nach einem der Ansprüche 1 bis 4, bei welchem der Helixwinkel jeder Rippe (11) und Nut (15) über die Länge des Schuberzeugers variiert.
  6. Schuberzeuger nach Anspruch 5, bei welchem zumindest ein Element jeder Paarung "Rippe (30) und Nut (36)" um eine radiale Achse (42) drehbar ist, um seinen Helixwinkel an den Helixwinkel des anderen Elementes der genannten Paarung "Rippe (30) und Nut (36)" anzupassen.
  7. Schuberzeuger nach einem der Ansprüche 1 bis 6, bei welchem jede Rippe (11) am Innenteil (5) und jede Nut (15) am Außenteil (3) angeordnet ist.
  8. Schuberzeuger nach einem der Ansprüche 1 bis 7, bei welchem der Bohrstrang einen unten im Bohrloch arbeitenden Motor aufweist, welcher die Bohrkrone antreibt, wobei der Motor zwischen dem Schuberzeuger und der Bohrkrone angeordnet ist.
EP96923945A 1995-06-27 1996-06-26 Hydraulische schubvorrichtung zur verwendung in einer bohrstange Expired - Lifetime EP0835360B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96923945A EP0835360B1 (de) 1995-06-27 1996-06-26 Hydraulische schubvorrichtung zur verwendung in einer bohrstange

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP95201736 1995-06-27
EP95201736 1995-06-27
EP96923945A EP0835360B1 (de) 1995-06-27 1996-06-26 Hydraulische schubvorrichtung zur verwendung in einer bohrstange
PCT/EP1996/002798 WO1997001693A1 (en) 1995-06-27 1996-06-26 Hydraulic thruster for use in a drill string

Publications (2)

Publication Number Publication Date
EP0835360A1 EP0835360A1 (de) 1998-04-15
EP0835360B1 true EP0835360B1 (de) 1999-03-17

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Family Applications (1)

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EP96923945A Expired - Lifetime EP0835360B1 (de) 1995-06-27 1996-06-26 Hydraulische schubvorrichtung zur verwendung in einer bohrstange

Country Status (5)

Country Link
EP (1) EP0835360B1 (de)
JP (1) JPH11508650A (de)
CA (1) CA2224720A1 (de)
DE (1) DE69601800T2 (de)
WO (1) WO1997001693A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO322144B1 (no) 2005-01-14 2006-08-21 Tomax As Momentomformer til bruk ved boring med roterende borekrone
CN104295231B (zh) * 2014-09-16 2016-08-24 西南石油大学 一种低摩阻可变径液力推力器
US11131167B1 (en) 2017-11-10 2021-09-28 National Technology & Engineering Solutions Of Sandia, Llc Modular anti-rotation drilling systems and methods

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1688994A (en) * 1923-12-17 1928-10-23 Eggleston Drilling Corp Method and apparatus for drilling holes
US1650301A (en) * 1926-05-19 1927-11-22 Merrill C Risher Rotary-drill connection
US1785086A (en) * 1928-03-01 1930-12-16 Leroy G Gates Automatic feed device for rotary drill bits
US3230740A (en) * 1963-10-16 1966-01-25 Fred K Fox Drill string shock absorber and vibration dampener
US3339380A (en) * 1965-09-16 1967-09-05 Fred K Fox Shock absorber
US4443206A (en) * 1982-02-05 1984-04-17 Dailey, Inc. Well tool
US5119891A (en) * 1988-10-31 1992-06-09 S & T No 13 Pty Ltd. Adaptor for drilling strings with controllable air passage
SE503324C2 (sv) * 1990-02-19 1996-05-28 Sandvik Ab Borrverktyg för sänkborrning, med central pilotkrona
US5205365A (en) * 1991-02-28 1993-04-27 Union Oil Company Of California Pressure assisted running of tubulars

Also Published As

Publication number Publication date
DE69601800T2 (de) 1999-09-09
WO1997001693A1 (en) 1997-01-16
JPH11508650A (ja) 1999-07-27
EP0835360A1 (de) 1998-04-15
DE69601800D1 (de) 1999-04-22
CA2224720A1 (en) 1997-01-16

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