EP0544835B1 - Bohrstrangelement mit einer Nut von variabler Tiefe - Google Patents

Bohrstrangelement mit einer Nut von variabler Tiefe Download PDF

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Publication number
EP0544835B1
EP0544835B1 EP91919444A EP91919444A EP0544835B1 EP 0544835 B1 EP0544835 B1 EP 0544835B1 EP 91919444 A EP91919444 A EP 91919444A EP 91919444 A EP91919444 A EP 91919444A EP 0544835 B1 EP0544835 B1 EP 0544835B1
Authority
EP
European Patent Office
Prior art keywords
section
inertia
grooved
cross
slip
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
EP91919444A
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English (en)
French (fr)
Other versions
EP0544835A1 (de
EP0544835A4 (en
Inventor
Thomas E. Winship
Edmond I. Balley
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.)
Shawcor Ltd
Original Assignee
Shawcor Ltd
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Filing date
Publication date
Application filed by Shawcor Ltd filed Critical Shawcor Ltd
Publication of EP0544835A1 publication Critical patent/EP0544835A1/de
Publication of EP0544835A4 publication Critical patent/EP0544835A4/en
Application granted granted Critical
Publication of EP0544835B1 publication Critical patent/EP0544835B1/de
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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/16—Drill collars
    • 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
    • E21B17/22—Rods or pipes with helical structure

Definitions

  • This invention relates in general to drill string members used in the rotary drilling art of the oil and gas industry.
  • the invention relates to an intermediate weight member adapted for placement between relatively lighter weight drill pipe and heavier weight drill collars.
  • Intermediate weight members have been used in the art of rotary drilling as a transition member between stiff drilling collars and standard drill pipe. Such intermediate weight members reduce fatigue in the stress-susceptible transition zone between drill pipe and drilling collars.
  • a prior art intermediate weight member sold by OMSCO Industries includes a relatively heavy weight tubular member having upper and lower sections separated by a short center wear pad.
  • the member has a constant inner diameter along its entire length.
  • the upper and lower sections are of constant outer diameter.
  • the wear pad has an outer diameter which is slightly less than about 13 millimetres larger than the outer diameter of the upper and lower sections.
  • the outer diameter of the upper section is small enough to enable handling by standard slips and elevators of a drilling rig.
  • the cross-section moment of inertia of the OMSCO intermediate weight member is significantly greater at the center wear pad from that at the upper and lower constant outer diameter sections. Accordingly, the OMSCO intermediate weight member, because of its construction, can be characterised by upper and lower relatively limber sections separated by a relatively stiff center section.
  • the Chance drill string member includes an upper relatively short slip and elevator section and a lower grooved section which extends substantially the remaining length of the member.
  • the grooved section is of an outer diameter which is larger than the outer diameter of the slip and elevator section, but has spiral grooves formed therein of a number and depth such that the bending moment of inertia along the entire length of the member is susbstantially constant.
  • the cross-section moment of inertia anywhere along the spiral section is substantially equal to the cross-section moment of inertia in the slip and elevator area.
  • the Chance member can be characterized as having a single bending pattern which is substantially constant from one end of the member to the other.
  • the spiralled grooved section provides advantages, like other spiralled members, of reduced potential for differential sticking in the hole, aiding in the removal of drilling chips up the annulus between the drill string and the borehole, and possible forward thrusting effect during drilling.
  • the member includes a partially grooved section placed downwardly of the slip and elevator 5 section.
  • the outer diameter of the grooved section is greater than the outer diameter of the slip and elevator section.
  • the grooved section includes first and second grooved sections separated by an ungrooved section.
  • the ungrooved section is a relatively short section which may include hardbanding rings. Such rings are typically welded on strips that include granulated tungsten carbide particles which inhibit wear.
  • the first and second grooved sections include grooves which vary in depth as a function of the length of the respective section.
  • the first grooved section between the slip and elevator section and the ungrooved section is characterised by spiral grooves which are cut deeply into the outer diameter of the section at its slip and elevator end. Such grooves are cut progressively less deeply as the length of the first section approaches the ungrooved section.
  • the bending or cross-section moment of inertia of the member makes a relatively smooth transition from the slip and elevator section to the first grooved section as the length of the member increases from top to bottom.
  • the term "bending moment” as used in the specification and claims shall be interpreted as the moment of inertia of a cross-section where the deflection is calculated.
  • the shape of the cross-section moment of inertia as a function of length along the member provides an intermediate heavy wall tool which is relatively more stiff at a short center section, yet is relatively more flexible at its ends. Such characteristics are advantageous in horizontal and directional drilling where the member is likely to be put under compression and a central, relatively more stiff and rugged region provides enhanced life and drilling performance.
  • the spiralled sections of the first and second grooved sections not only provide the advantages of a smoothly varying cross-section moment of inertia of the member as a function of length, but also provide advantages of reducing possible differential sticking problems in the borehole.
  • the novel structure also results in an intermediate weight drill string member of greater weight of the entire member as compared with prior art members. Such greater weight is advantageous in providing more weight on the drilling bit below.
  • the novel structure also provides a greater wear surface toward the center of the member as compared with prior art members.
  • Figures 1 through 5 illustrate the elongated integral drill string member 10 having tool joints 11 and 12 provided (as by welding) to its upper and lower ends.
  • the tool joint 11 is provided with box threads to releasably join member 10 with other members 10 or with a string of drill pipe above.
  • the tool joint 12 is provided with pin threads to releasably join member 10 or with a bottom hole assembly including drill collars below.
  • the graph of Figure 1 below the illustration of drill string member 10 shows that the cross-section moment of inertia at P 1 , where grooves 30A, 30B, 30C begin in first grooved section 18, makes a relatively smooth transition from the slip and elevator section 14 to the first grooved section 18.
  • This graph depicts typical values for a 127mm size intermediate weight member.
  • the grooves 30A, 30B, and 30C are progressively shallower with increasing length along grooved section 18 until such grooves vanish at the lower or ungrooved section end of first grooved section 18.
  • the bending moment of inertia of the ungrooved section 22 is approximately fifty percent greater than that of the slip and elevator section 14.
  • the grooves 30A, 30B, 30C of second grooved section 20 are shallow cut at the upper or ungrooved section end and are cut progressively more deeply with increasing length as illustrated in Figures 1 and 2 and especially in Figures 5, 4 and 3.
  • Preferably such grooves have a depth at the lower end of second grooved section 20 such that the bending moment of inertia at point P 2 approximately matches that of reduced diameter section 24.
  • the drill string member 10 of the invention may also include one or more hardbanding rings 26 and 28 about ungrooved section 22. Such rings enhance the wear characteristics of the member where the ungrooved section 22 scrapes against the borehole.
  • the drill string member 10 including upper and lower tool joints 11 and 12 produces advantages of relatively flexible ends with a relatively stiff center section.
  • the center section 22 also functions as a wear region which may be hardbanded.
  • drill string member 10 as an intermediate weight member between drill pipe and drill collars.
  • a modification of the structure of Figures 1 and 2 may be advantageous where hardbanding between grooved section 18 and grooved section 20 is not necessary.
  • the length of ungrooved section 22 may be reduced to zero such that the grooves of grooved section 18 become very shallow at its lower end and actually become continuous with the shallow grooves of grooved section 20.
  • the shallow grooves of grooved section 18 at its lower end can be continuous with shallow grooves of grooved section 20 at its upper end.
  • Still another modification of the structure of Figures 1 and 2 may be advantageous, like that above, where the length of ungrooved section 22 may be reduced to zero. Rather than the shallow grooves of grooved section 18 being continuous with the shallow grooves of grooved section 20, such grooves may simply vanish in an alternating or interleaving manner at the point along the length of member 10 where the two grooved sections 18 and 20 come together.
  • the two sets of groove patterns are not continuous at the intersection point, but rather are spaced from each other at sixty degree intervals, for example, about the periphery of the member 10 at the intersection of grooved section 18 and grooved section 20.
  • the drill string member 10 is manufactured from a steel bar or tube of outside diameter D.
  • a bore of diameter d o is formed in the bar or tube.
  • Slip and elevator section 14, reduced diameter section 24, and first and second grooved sections 18 and 20 are formed by conventional machining techniques.
  • Grooves 30A, 30B and 30C are formed with a grooving machine having a flat bottomed cutter.
  • Other groove shapes may be used by those of skill in the machining art without varying from the scope of the invention as defined by the appended claims. Any grooves formed as a function of length in first and second grooved sections 18 and 20 which produce a cross-section moment of inertia versus length profile similar to that of Figure 1 is within the scope of the invention as defined by the appended claims.

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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)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Claims (8)

  1. Bohrstrangelement (10), das zwischen eine Schwerstange und ein Gestängerohr eingesetzt werden kann, umfassend:
    ein einstückiges, langgestrecktes rohrförmiges Element mit einem an jedem Ende angebrachten ersten und zweiten Bohrstangenschloß (11, 12),
    wobei das einstückige Element einen Abfangkeilheberabschnitt (14) mit einem ersten im allgemeinen einheitlichen Außendurchmesser (d1) an einem seiner Enden im Bereich des ersten Bohrstangenschlosses (11) aufweist,
    wobei das einstückige Element einen teilweise gerieften Abschnitt (16) mit einem zweiten im allgemeinen einheitlichen Außendurchmesser (D) besitzt, der größer ist als der erste Außendurchmesser (d1) des Abfangkeilheberabschnitts (14),
    wobei der teilweise geriefte Abschnitt (16) einen ungerieften mittleren Abschnitt (22) mit einander entgegengesetzten Enden aufweist, wobei ein erster geriefter Endabschnitt (18) zwischen dem Abfangkeilheberabschnitt (14) und einem Ende des ungerieften mittleren Abschnitts (22) angeordnet ist, und ein zweiter geriefter Endabschnitt (20) zwischen dem zweiten Bohrstangenschloß (12) und dem anderen Ende des ungerieften mittleren Abschnitts (22) angeordnet ist, dadurch gekennzeichnet, daß sich das Querschnittsträgheitsmoment des ersten und des zweiten gerieften Endabschnitts (18, 20) je nach dessen Länge ändert, so daß
    ein Querschnittsträgheitsmoment eines ersten Endes des ersten gerieften Endabschnitts (18) im Bereich des Abfangkeilheberabschnitts (14) ungefähr einem Querschnittsträgheitsmoment des Abfangkeilheberabschnitts entspricht, und ein Querschnittsträgheitsmoment eines zweiten Endes des ersten gerieften Endabschnitts (18) ungefähr einem Querschnittsträgheitsmoment des ungerieften mittleren Abschnitts (22) entspricht, und
    ein Querschnittsträgheitsmoment eines ersten Endes des zweiten gerieften Endabschnitts (20) ungefähr dem Querschnittsträgheitsmoment des ungerieften mittleren Abschnitts (22) entspricht, und ein Querschnittsträgheitsmoment eines zweiten Endes des zweiten gerieften Endabschnitts (20) ungefähr dem Querschnittsträgheitsmoment des Abfangkeilheberabschnitts (14) entspricht.
  2. Element nach Anspruch 1, bei dem der erste und der zweite geriefte Endabschnitt (18, 20) jeweils mindestens eine spiralförmige Nut aufweisen.
  3. Element nach Anspruch 1 oder Anspruch 2, bei dem der erste und der zweite geriefte Endabschnitt (18, 20) jeweils drei rechtsgängige Spiralnuten (30A, 30B, 30C) aufweisen.
  4. Element nach einem der Ansprüche 1 bis 3, bei dem an dem ungerieften mittleren Abschnitt (22) mindestens ein harter Versteifungsring (26, 28) befestigt ist.
  5. Element nach einem der Ansprüche 1 bis 4, bei dem der erste und der zweite geriefte Endabschnitt (18, 20) jeweils drei rechtsgängige Spiralnuten aufweist, deren Tiefe in dem zweiten Außendurchmesser von der jeweiligen Länge abhängt, so daß das Querschnittsträgheitsmoment des ersten gerieften Endabschnitts (18) ungefähr linear mit der Länge von dem ersten Ende zu dem zweite Ende variiert, und das Querschnittsträgheitsmoment des zweiten gerieften Endabschnitts (20) ungefähr linear mit der Länge von dem ersten Ende zu dem zweiten Ende variiert.
  6. Element nach einem der Ansprüche 1 bis 5, bei dem das Querschnittsträgheitsmoment des ungerieften Abschnitts (22) ungefähr fünfzig Prozent größer ist als das Querschnittsträgheitsmoment des Abfangkeilheberabschnitts (14).
  7. Element nach einem der Ansprüche 1 bis 6, bei dem die Bohrstangenschlösser (11, 12) an jedem Ende des rohrförmigen Elements mit diesem verschweißt sind.
  8. Element nach einem der Ansprüche 1 bis 7, des weiteren umfassend einen Abschnitt (24) mit vermindertem Durchmesser, der zwischen dem zweiten Ende des zweiten gerieften Endabschnitts (20) und dem anderen der Bohrstangenschlösser (12) angeordnet ist, wobei der Abschnitt (24) mit vermindertem Durchmesser kurz ist im Verhältnis zur Länge des zweiten gerieften Endabschnitts (20).
EP91919444A 1991-06-25 1991-06-25 Bohrstrangelement mit einer Nut von variabler Tiefe Expired - Lifetime EP0544835B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1991/003159 WO1993000500A2 (en) 1991-06-25 1991-06-25 Variable depth grooved drill string member

Publications (3)

Publication Number Publication Date
EP0544835A1 EP0544835A1 (de) 1993-06-09
EP0544835A4 EP0544835A4 (en) 1993-09-22
EP0544835B1 true EP0544835B1 (de) 1996-08-21

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ID=22225514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91919444A Expired - Lifetime EP0544835B1 (de) 1991-06-25 1991-06-25 Bohrstrangelement mit einer Nut von variabler Tiefe

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EP (1) EP0544835B1 (de)
CA (1) CA2090758C (de)
DE (1) DE69121575T2 (de)
WO (1) WO1993000500A2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030132035A1 (en) * 2001-04-26 2003-07-17 Tsutomu Kaneko Step tube rod, and drilling machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125173A (en) * 1964-03-17 Tubular drill string members
US4285407A (en) * 1979-12-17 1981-08-25 Samford Travis L Straight hole driller
US4460202A (en) * 1980-11-26 1984-07-17 Chance Glenn G Intermediate weight drill string member
FR2517357A1 (fr) * 1981-11-27 1983-06-03 Smf Int Tige de forage
US4811800A (en) * 1987-10-22 1989-03-14 Homco International Inc. Flexible drill string member especially for use in directional drilling

Also Published As

Publication number Publication date
EP0544835A1 (de) 1993-06-09
EP0544835A4 (en) 1993-09-22
CA2090758C (en) 1998-07-28
DE69121575T2 (de) 1997-03-13
DE69121575D1 (de) 1996-09-26
CA2090758A1 (en) 1992-12-26
WO1993000500A3 (en) 1993-02-18
WO1993000500A2 (en) 1993-01-07

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