CA2098677A1 - Logging While Drilling Tools Utilizing Magnetic Positioner Assisted Phase Shifts - Google Patents

Logging While Drilling Tools Utilizing Magnetic Positioner Assisted Phase Shifts

Info

Publication number
CA2098677A1
CA2098677A1 CA2098677A CA2098677A CA2098677A1 CA 2098677 A1 CA2098677 A1 CA 2098677A1 CA 2098677 A CA2098677 A CA 2098677A CA 2098677 A CA2098677 A CA 2098677A CA 2098677 A1 CA2098677 A1 CA 2098677A1
Authority
CA
Canada
Prior art keywords
motor
coupled
magnetic positioner
arc
encoder
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
CA2098677A
Other languages
French (fr)
Other versions
CA2098677C (en
Inventor
David Malone
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.)
Schlumberger Canada Ltd
Original Assignee
David Malone
Schlumberger Technology Corporation
Schlumberger Canada Limited
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 David Malone, Schlumberger Technology Corporation, Schlumberger Canada Limited filed Critical David Malone
Publication of CA2098677A1 publication Critical patent/CA2098677A1/en
Application granted granted Critical
Publication of CA2098677C publication Critical patent/CA2098677C/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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means 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
    • E21B47/14—Means 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
    • E21B47/18—Means 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
    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means 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
    • E21B47/14—Means 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
    • E21B47/18—Means 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
    • E21B47/20—Means 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 modulation of mud waves, e.g. by continuous modulation

Abstract

A LWD tool is disclosed comprising, an encoder for generating a signal in the borehole fluid flowing therethrough, a brushless DC motor coupled to the encoder, a position sensor coupled to the motor for sensing the rotational position thereof, motor drive electronics coupled to motor for driving the motor, a microprocessor coupled to the position sensor and to the drive electronics for controlling the drive signals to the motor based on the actual and desired positions of the motor, and a magnetic positioner which is coupled to one of the drive shafts of the system. By controlling the drive signal to the motor, the speed of the motor is controlled, thus effecting changes in frequency and/or phase of the signal. The magnetic positioner, includes inner S magnets extending in a first arc, inner N magnets extending in a second arc, outer S magnets extending in a third arc, and outer N magnets extending in a fourth arc, where the inner magnets rotate with the drive shaft. The magnetic positioner is provided to force the rotor of the encoder into an open position relative to the stator in the case of loss of power. The magnetic positioner is also used to aid in the deceleration and acceleration of the encoder during phase shifting.
CA002098677A 1992-08-21 1993-06-17 Logging while drilling tools utilizing magnetic positioner assisted phase shifts Expired - Lifetime CA2098677C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/934,083 1992-08-21
US07/934,083 US5237540A (en) 1992-08-21 1992-08-21 Logging while drilling tools utilizing magnetic positioner assisted phase shifts

Publications (2)

Publication Number Publication Date
CA2098677A1 true CA2098677A1 (en) 1994-02-22
CA2098677C CA2098677C (en) 1999-01-26

Family

ID=25464936

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002098677A Expired - Lifetime CA2098677C (en) 1992-08-21 1993-06-17 Logging while drilling tools utilizing magnetic positioner assisted phase shifts

Country Status (6)

Country Link
US (1) US5237540A (en)
EP (1) EP0588389B1 (en)
CA (1) CA2098677C (en)
DE (1) DE69313055T2 (en)
ID (1) ID822B (en)
NO (1) NO305328B1 (en)

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US20110174543A1 (en) * 2010-01-20 2011-07-21 Adam Walkingshaw Detecting and measuring a coring sample
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US10753201B2 (en) 2012-12-17 2020-08-25 Evolution Engineering Inc. Mud pulse telemetry apparatus with a pressure transducer and method of operating same
CA3036490C (en) 2012-12-17 2021-08-03 Evolution Engineering Inc. Mud pulse telemetry apparatus with a pressure transducer and method of operating same
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Also Published As

Publication number Publication date
NO305328B1 (en) 1999-05-10
DE69313055T2 (en) 1998-03-12
NO932265L (en) 1994-02-22
CA2098677C (en) 1999-01-26
NO932265D0 (en) 1993-06-18
EP0588389A1 (en) 1994-03-23
US5237540A (en) 1993-08-17
EP0588389B1 (en) 1997-08-13
ID822B (en) 1996-07-23
DE69313055D1 (en) 1997-09-18

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Legal Events

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EEER Examination request
MKLA Lapsed

Effective date: 20130618

MKEC Expiry (correction)

Effective date: 20131009