CA2090758A1 - Variable Depth Grooved Drill String Member - Google Patents

Variable Depth Grooved Drill String Member

Info

Publication number
CA2090758A1
CA2090758A1 CA2090758A CA2090758A CA2090758A1 CA 2090758 A1 CA2090758 A1 CA 2090758A1 CA 2090758 A CA2090758 A CA 2090758A CA 2090758 A CA2090758 A CA 2090758A CA 2090758 A1 CA2090758 A1 CA 2090758A1
Authority
CA
Canada
Prior art keywords
section
slip
inertia
bending moment
elevator
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
CA2090758A
Other languages
French (fr)
Other versions
CA2090758C (en
Inventor
Thomas E. Winship
Edmond I. Bailey
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.)
Omsco Inc
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 CA2090758A1 publication Critical patent/CA2090758A1/en
Application granted granted Critical
Publication of CA2090758C publication Critical patent/CA2090758C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Abstract

An intermediate weight member (10) having a variable cross-section or bending moment of inertia as a function of member length is disclosed. At one end of the member (10) a slip and elevator section (14) is provided. A partially grooved section (16) of a diameter greater than that of the slip and elevator section extends between the slip and elevator section (24) and the other end of the member (10). The partially grooved section (16) includes two variable depth grooved sections (18, 20) separated by an ungrooved section (22). The ungrooved section (22) includes hardbanding rings (26, 28). The spiral grooves (30A, 30B, 30C) of variable depth grooved section (18, 20) vary in depth as a function of member length such that the bending moment of inertia varies as a function of length from the slip and elevator section (14) to the lower end of the member (10).
Such variation changes from a constant bending moment of inertia at the slip and elevator section (14) to a substantially greater bending moment of inertia at the ungrooved section (22) and thence to a lower bending moment of inertia of a reduced diameter section (24) at its other end.
CA002090758A 1991-06-25 1991-06-25 Variable depth grooved drill string member Expired - Lifetime CA2090758C (en)

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 (2)

Publication Number Publication Date
CA2090758A1 true CA2090758A1 (en) 1992-12-26
CA2090758C CA2090758C (en) 1998-07-28

Family

ID=22225514

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002090758A Expired - Lifetime CA2090758C (en) 1991-06-25 1991-06-25 Variable depth grooved drill string member

Country Status (4)

Country Link
EP (1) EP0544835B1 (en)
CA (1) CA2090758C (en)
DE (1) DE69121575T2 (en)
WO (1) WO1993000500A2 (en)

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 (en) * 1981-11-27 1983-06-03 Smf Int Boring rod for ground working - is divided into three zones with centre having hard covering and shearing neck at top
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
CA2090758C (en) 1998-07-28
DE69121575T2 (en) 1997-03-13
DE69121575D1 (en) 1996-09-26
EP0544835A4 (en) 1993-09-22
EP0544835A1 (en) 1993-06-09
EP0544835B1 (en) 1996-08-21
WO1993000500A3 (en) 1993-02-18
WO1993000500A2 (en) 1993-01-07

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Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry