CA2321072A1 - Electro-hydraulically controlled tractor - Google Patents

Electro-hydraulically controlled tractor Download PDF

Info

Publication number
CA2321072A1
CA2321072A1 CA002321072A CA2321072A CA2321072A1 CA 2321072 A1 CA2321072 A1 CA 2321072A1 CA 002321072 A CA002321072 A CA 002321072A CA 2321072 A CA2321072 A CA 2321072A CA 2321072 A1 CA2321072 A1 CA 2321072A1
Authority
CA
Canada
Prior art keywords
gripper
propulsion
tractor
borehole
pistons
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
CA002321072A
Other languages
French (fr)
Other versions
CA2321072C (en
Inventor
Ronald E. Beaufort
Duane Bloom
Norman Bruce Moore
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.)
WWT North America Holdings 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 CA2321072A1 publication Critical patent/CA2321072A1/en
Application granted granted Critical
Publication of CA2321072C publication Critical patent/CA2321072C/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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/18—Anchoring or feeding in the borehole
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E21B23/001—Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E21B23/04—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion

Abstract

A tractor (20) for moving within a borehole comprises body and two propulsion assemblies (24, 26) that are longitudinally movably engaged with the body. The tractor body has annular pistons (34, 36, 38, 40) configured to receive hydraulic thrust to propel the body longitudinally. Each propulsion assembly includes a gripper (42, 52) and propulsion cylinders (44, 46, 48, 50). The gripper has an actuated position in which the gripper limits relative movement between the gripper and the inner surface of the borehole, and a retracted position in which the gripper permits free relative movement between the gripper and the inner surface of a borehole. Each propulsion cylinder contains one of the pistons. The tractor includes a control assembly (30) having valves and hydraulic circuitry which control the sequencing of fluid distribution to the propulsion cylinders, and of the actuation and retraction of the grippers. A throttle valve (54) controls the fluid flowrate to the pistons.
CA002321072A 1998-12-18 1999-12-17 Electro-hydraulically controlled tractor Expired - Lifetime CA2321072C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11283398P 1998-12-18 1998-12-18
US60/112,833 1998-12-18
PCT/US1999/030290 WO2000036266A1 (en) 1998-12-18 1999-12-17 Electro-hydraulically controlled tractor

Publications (2)

Publication Number Publication Date
CA2321072A1 true CA2321072A1 (en) 2000-06-22
CA2321072C CA2321072C (en) 2005-04-12

Family

ID=22346072

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002321072A Expired - Lifetime CA2321072C (en) 1998-12-18 1999-12-17 Electro-hydraulically controlled tractor

Country Status (8)

Country Link
US (2) US6241031B1 (en)
AU (1) AU743946B2 (en)
BR (1) BR9908000A (en)
CA (1) CA2321072C (en)
DK (1) DK200001201A (en)
GB (2) GB2380755B (en)
NO (1) NO317197B1 (en)
WO (1) WO2000036266A1 (en)

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Also Published As

Publication number Publication date
AU743946B2 (en) 2002-02-07
NO20003926D0 (en) 2000-08-02
GB0019447D0 (en) 2000-09-27
GB0300216D0 (en) 2003-02-05
CA2321072C (en) 2005-04-12
AU2482000A (en) 2000-07-03
NO317197B1 (en) 2004-09-13
DK200001201A (en) 2000-10-13
US6427786B2 (en) 2002-08-06
GB2351308A (en) 2000-12-27
WO2000036266A1 (en) 2000-06-22
US20020007971A1 (en) 2002-01-24
BR9908000A (en) 2002-01-15
GB2380755A (en) 2003-04-16
NO20003926L (en) 2000-10-11
GB2380755B (en) 2003-05-28
GB2351308B (en) 2003-05-28
US6241031B1 (en) 2001-06-05

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EEER Examination request
MKEX Expiry

Effective date: 20191217