公开(公告)号：EP0292541A4

公开(公告)日：1989-08-16

申请号：EP88900191

申请日：1987-12-04

Applicant: WESTERN ATLAS INT INC

Inventor： WIDROW BERNARD

IPC: G01V1/00 ,  G01V1/36 ,  G01V1/42

CPC classification number: G01V1/42 ,  G01V1/368 ,  G01V2210/27

Abstract: An apparatus (10) for determining while drilling in the earth with a drill bit (12) the positions of seismic wave reflecting geologic formations (15, 17) has seismic wave sensors (A, B) positioned in the earth near its surface (42). The sensors (A, B) are disposed at known positions with respect to the borehole. The drill bit (12) generates the seismic waves. The sensors (A, B) receive the seismic waves both directly and by reflection from the geologic formations (15, 17). Adaptive filters (20, 26) are connected to each of the sensors (A, B). A summing circuit (34) receives outputs from the adaptive filters (20, 26). The converged impulse responses of the adaptive filters provide information about the amplitude of the reflected waves and their arrival times at the surface, thus allowing detection of the reflecting horizons and their location and physical characteristics.

公开(公告)号：EP0666992A4

公开(公告)日：1998-04-29

申请号：EP94923411

申请日：1994-07-13

Applicant: WESTERN ATLAS INT INC

Inventor： DRAGOSET WILLIAM H JR

IPC: G01V1/28 ,  G01P3/42 ,  G01S7/527 ,  G01S7/536 ,  G01V1/36 ,  G01V1/38 ,  G06F17/00 ,  G10K11/178

CPC classification number: G01V1/3808 ,  G01P3/42 ,  G01V1/364 ,  G01V2210/56

Abstract: A method for reducing the effects of reverberation on noisy seismic wavefields recorded from within a moisture-laden environment. The wavefield manifests itself as a pressure signature and a velocity signature that contains an embedded noise signature. The pressure signature is adaptively filtered and subtractively combined with the velocity signature to isolate a nearly pure noise signature. The nearly pure noise signature is added back to the original velocity signature with opposite sign to clear away the embedded noise, leaving a refined velocity signature. The refined velocity signature iteratively is scaled and summed with the pressure signature, incrementing the scale factor at each iteration and autocorrelating the sum. A coefficient of convergence is calculated after each summation. The coefficient of convergence that most closely approaches unity identifies the preferred scale factor.

公开(公告)号：EP0620893A4

公开(公告)日：1998-01-07

申请号：EP94903265

申请日：1993-11-15

Applicant: WESTERN ATLAS INT INC

Inventor： MICHAELS JOHN M ,  LEDER JOHN T

IPC: E21B49/10 ,  E21B49/00

CPC classification number: E21B49/10

Abstract: A method and apparatus for use in formation testing instrument (13) for acquisition of a phase intact sample of connate fluid. One or more fluid sample tanks (26, 28) contained within the instrument (13) are pressure balanced with respect to the wellbore at formation level and are filled with a connate fluid sample in such manner that during filling of the sample tanks (26, 28) the pressure of the connate fluid is maintained within the predetermined range above the bubble point of the fluid sample. The sample tank (26, 28) incorporates an internal free-floating piston (46) which separates the sample tank into sample containing and pressure balancing chambers with the pressure balancing chamber being in communication with borehole pressure. The sample tank is provided with a cut-off valve (27, 29) enabling the pressure of the fluid sample to be maintained after the formation testing instrument (13) has been retrieved from the wellbore for transportation to a laboratory facility.

公开(公告)号：EP0646215A4

公开(公告)日：1997-12-10

申请号：EP93916625

申请日：1993-06-18

Applicant: WESTERN ATLAS INT INC

Inventor： LEDER JOHN T ,  MICHAELS JOHN M ,  SHWE THAN ,  ANDERSON CRAWFORD A

IPC: E21B49/00 ,  E21B49/10 ,  G01N7/14 ,  G01N33/28 ,  E21B47/06 ,  E21B47/12 ,  F04B53/00 ,  G01N33/24

CPC classification number: E21B23/06 ,  E21B49/008 ,  E21B49/10 ,  G01N7/14 ,  G01N33/2823

Abstract: A method and apparatus for conducting in situ tests on a subsurface earth formation (11) of interest which is traversed by a wellbore (10). A wireline formation testing instrument (13) is positioned at formation depth by winding or unwinding cable (12) from hoist (20), and a sampling probe (18) thereof is extended into fluid communication with the formation (11) and isolated from wellbore pressure. The sampling and measuring instrument (13) is comprised of a hydraulic power system (14), a fluid sample storage section (15) and a sampling mechanism section (16). Utilizing a hydraulically energized double-acting bidirectional piston pump and by valve controlled selection of pumping direction, testing fluid such as completion fluid may be pumped into the formation through the sampling probe either from fluid reservoirs of the instrument or from the wellbore. After reversing the operating and control valving of the pump and instrument, the piston pump is utilized to extract formation fluid from the formation (11) and pump it to sample tanks of the instrument (13), pump it to the wellbore (10) or subject it to controlled pressure for real time formation testing and for formation characterization.

公开(公告)号：EP0648342A4

公开(公告)日：1996-12-18

申请号：EP93916960

申请日：1993-07-02

Applicant: WESTERN ATLAS INT INC

Inventor： ZHOU QIANG

IPC: G01V3/28 ,  G01V13/00

CPC classification number: G01V3/28 ,  G01V13/00

Abstract: A calibration fixture for an MWD logging tool consists of a plurality of concentric co-planar conductive calibration loops are mounted around the logging tool mandrel coaxially with the usual transmitter(s) and receivers that are mounted on the tool. The calibration loops are terminated with a multiple-tap impedance quantizing means for discretely varying the impedance of the calibration loops. When a transmitter is activated to emit an electromagnetic signal, the calibration loops are excited to reradiate a portion of that signal into the receivers with an intensity that is a function of the loop impedance thereby to simulate the effects of formations having known resistivities.

公开(公告)号：EP0658252A4

公开(公告)日：1997-10-08

申请号：EP94917455

申请日：1994-05-20

Applicant: WESTERN ATLAS INT INC

Inventor： BEASLEY CRAIG J ,  WORKMAN RICKY L

IPC: G01V1/36 ,  G01V1/38

CPC classification number: G01V1/362 ,  G01V1/3861 ,  G01V2210/522

Abstract: This invention provides a method for examining the geometry of the disposition of a plurality of sources (18-24) and receivers (10-16) over an area to be surveyed with a view to optimizing the array to avoid data shadow zones and to optimize the resulting seismic image. The method depends upon studying the statistical distribution of dip polarity in dip bins along selected CMP azimuths.

公开(公告)号：EP0621958A4

公开(公告)日：1996-11-13

申请号：EP94900347

申请日：1993-09-24

Applicant: WESTERN ATLAS INT INC

Inventor： JOHNSTON OTIS A

IPC: G01V1/04 ,  G01V1/00 ,  G01V1/38 ,  H04B13/00

CPC classification number: G01V1/04

Abstract: This invention is a seismic source system (10) for marine surveying using a small diameter hose bundle (22) containing an electrical cable (40) disposed within an air hose (46) which is reinforced with torque-balanced layers of armor components (50) and protective jacket (60) and connected to a termination assembly (20) at one end for connection to an electrical power supply (18), pressurized air supply (16) and control system (14) and connected to another termination assembly (26) at the other end for connection to an air gun subarray comprising multiple air guns.

公开(公告)号：EP0630485A4

公开(公告)日：1996-07-24

申请号：EP94906447

申请日：1993-12-17

Applicant: WESTERN ATLAS INT INC

Inventor： TAYLOR ROBERT M

IPC: E21B49/08 ,  G01R27/22 ,  G01V3/30 ,  G01R27/00

CPC classification number: G01R27/22 ,  E21B49/08 ,  E21B2049/085 ,  G01V3/30 ,  Y02A90/344

Abstract: There is disclosed in the present specification a method and apparatus for use of a downhole formation multi-tester instrument in the characterization of formation fluids, including measurement of the conductivity of water, often in the presence of hydrocarbons under dynamic flow conditions and determining the hydrocarbon volume of the formation fluid. Utilizing a coaxial transmission line as a flow tube within the formation multi-tester instrument an electromagnetic wave is generated which propagates through the formation fluid in a transverse electromagnetic mode. Measurement of the phase shift and attenuation of the electromagnetic wave at points within the flow tube allow characterization of the fluid inside the cavity of the flow tube for dielectric constant and conductivity. Dielectric constant and conductivity can then be related to fluid conductivity and hydrocarbon volume.

公开(公告)号：EP0725704A4

公开(公告)日：1995-12-15

申请号：EP93922380

申请日：1993-09-29

Applicant: WESTERN ATLAS INT INC

Inventor： KAISER RUSSELL E JR ,  MOWEN RICKY L ,  HYKES TIMOTHY W ,  FORTNEY DENNIS A ,  RICE DENNIS F

IPC: B24B19/12 ,  B24B21/00 ,  B24B21/06 ,  B24B21/08 ,  B24B21/16

CPC classification number: B24B21/16 ,  B24B19/12 ,  B24B21/00 ,  B24B21/08

Abstract: A grinding machine (10) utilizing multiple, parallel, endless, abrasive belts for simultaneously grinding several lobes on a cam shaft (46). The device includes a contouring head assembly (108), comprising plural contour feed units (194), each including a curved back-up shoe (254), back-up shoe holder (252), adaptor (246), and ball-spline mechanism (242) for pressing the back-up shoe (254) against an abrasive belt (76). A locating lip (250) is defined on each adaptor (246). The adaptors (246) are in two rows, with upper and lower rows ground to locate the adaptors relative to a reference. The back-up shoe holders (252) are secured in position upon the locating lips (250). A method of assembly, enclosure (110) that encompasses the contouring head assembly (108), laterally moveable support bracket (142) for the drive drum assembly (100), and several other complementary features, coact to provide a device having high efficiency and achieving high tolerances.

公开(公告)号：EP0636252A4

公开(公告)日：1995-05-24

申请号：EP94905394

申请日：1993-12-14

Applicant: WESTERN ATLAS INT INC

Inventor： CROWELL JOHN M ,  TESKE JAMES E

IPC: F15B15/14 ,  G01V1/155 ,  G01V1/04

CPC classification number: F15B15/1428 ,  G01V1/155

Abstract: A removable bore liner (30) is provided that substantially increases the dependability, flexibility and field serviceability of seismic vibrators (14) and other hydraulically actuated devices. A method for installing the removable bore liner (30) in a seismic vibrator (14) is also provided.