CA2170184A1 - Steerable rotary drilling systems - Google Patents

Steerable rotary drilling systems

Info

Publication number
CA2170184A1
CA2170184A1 CA002170184A CA2170184A CA2170184A1 CA 2170184 A1 CA2170184 A1 CA 2170184A1 CA 002170184 A CA002170184 A CA 002170184A CA 2170184 A CA2170184 A CA 2170184A CA 2170184 A1 CA2170184 A1 CA 2170184A1
Authority
CA
Canada
Prior art keywords
bias unit
unit
bias
control
drilling fluid
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
CA002170184A
Other languages
French (fr)
Other versions
CA2170184C (en
Inventor
John D. Barr
John M. Clegg
William C. Motion
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.)
Camco Drilling Group Ltd
Original Assignee
Camco Drilling Group Ltd
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 Camco Drilling Group Ltd filed Critical Camco Drilling Group Ltd
Publication of CA2170184A1 publication Critical patent/CA2170184A1/en
Application granted granted Critical
Publication of CA2170184C publication Critical patent/CA2170184C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • E21B7/06Deflecting the direction of boreholes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10Valve arrangements in drilling-fluid circulation systems
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/12Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • E21B47/18Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/12Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • E21B47/18Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
    • E21B47/22Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry by negative mud pulses using a pressure relieve valve between drill pipe and annulus

Abstract

A steerable rotary drilling system has a bottom hole assembly which includes, in addition to the drill bit, a modulated bias unit and a control unit, the bias unit comprising a number of hydraulic actuators around the periphery of the unit, each having a movable thrust member which is hydraulically displaceable outwardly for engagement with the formation of the borehole being drilled. Each actuator may be connected, through a control valve, to a source of drilling fluid under pressure and the operation of the valve is controlled by the control unit so as to modulate the fluid pressure supplied to the actuators as the bias unit rotates. If the control valve is operated in synchronism with rotation of the bias unit the thrust members impart a lateral bias to the bias unit, and hence to the drill bit, to control the direction of drilling. Pulses transmitted through the drilling fluid as a result of operation of the bias unit are detected and interpreted at the surface, or at a different location downhole, to obtain information regarding the operation of the bias unit or other parts of the bottom hole assembly. Data signals from downhole sensors may be arranged to modify the control and operation of the bias unit in such manner that the data is encoded as pulses generated in the drilling fluid by the bias unit.
CA002170184A 1995-02-25 1996-02-23 Steerable rotary drilling systems Expired - Lifetime CA2170184C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9503827.9 1995-02-25
GBGB9503827.9A GB9503827D0 (en) 1995-02-25 1995-02-25 "Improvements in or relating to steerable rotary drilling systems

Publications (2)

Publication Number Publication Date
CA2170184A1 true CA2170184A1 (en) 1996-08-26
CA2170184C CA2170184C (en) 2006-05-09

Family

ID=10770256

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002170184A Expired - Lifetime CA2170184C (en) 1995-02-25 1996-02-23 Steerable rotary drilling systems

Country Status (7)

Country Link
US (2) US5803185A (en)
EP (1) EP0728909B1 (en)
AU (1) AU712842B2 (en)
CA (1) CA2170184C (en)
DE (1) DE69609745T2 (en)
GB (2) GB9503827D0 (en)
NO (1) NO315134B1 (en)

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GB2298216B (en) 1998-09-16
GB2298216A (en) 1996-08-28
NO960590L (en) 1996-08-26
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EP0728909B1 (en) 2000-08-16
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DE69609745D1 (en) 2000-09-21
US6089332A (en) 2000-07-18
AU712842B2 (en) 1999-11-18
GB9603107D0 (en) 1996-04-10
US5803185A (en) 1998-09-08
NO960590D0 (en) 1996-02-15
NO315134B1 (en) 2003-07-14
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EP0728909A3 (en) 1997-08-06
EP0728909A2 (en) 1996-08-28

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