1
James V Leggett III, Vladimir Dubinsky, John W Harrell, William Thomas Balogh, Paul J G Seaton, Andrew G Brooks, Roger P Herbert: Drilling system with an acoustic measurement-while-driving system for determining parameters of interest and controlling the drilling direction. Baker Hughes Incorporated, Madan Mossman & Sriram P C, July 11, 2000: US06088294 (262 worldwide citation)

The present invention provides a system for drilling boreholes having a downhole subassembly which contains an acoustic measurement-while-drilling system. The acoustic system contains an acoustic transmitter and receiver for determining the acoustic velocity through the formations surrounding the bo ...


2
Andrew G Brooks, Macmillian M Wisler, Larry W Thompson, Jian Qun Wu, Wallace H Meyer Jr, John W Harrell: Method and apparatus for avoiding mutual coupling between receivers in measurement while drilling. Baker Hughes Incorporated, Madan & Morris PLLC, February 9, 1999: US05869968 (63 worldwide citation)

An arrangement of two closely spaced transmitters and two spaced apart receivers symmetrically disposed about the transmitters in a measurement while drilling tool avoids the effects of mutual coupling between the receivers. In one method of operation of the transmitters, each transmitter is sequent ...


3
Pushkar Jogi, Michael Neubert, John D MacPherson, James Hood, Thomas Dahl, Volker Krueger, Andrew G Brooks, Gerald Heisig: Method and apparatus for enhancing directional accuracy and control using bottomhole assembly bending measurements. Baker Hughes Incorporated, Madan Mossman & Sriram PC, March 17, 2009: US07503403 (36 worldwide citation)

A system for drilling a well comprises a tubular member having a bottomhole assembly at a bottom end thereof disposed in a wellbore. A first sensor is disposed in the bottomhole assembly at a predetermined axial location for detecting bending in a first axis and generating a first bending signal in ...


4
Robert Alan Estes, Hatem Salem Morsy, Andrew G Brooks: Apparatus to measure the earth's local gravity and magnetic field in conjunction with global positioning attitude determination. Baker Hughes Incorporated, Madan Mossman & Sriram P C, January 21, 2003: US06508316 (28 worldwide citation)

The present invention provides a method for determining magnetometer errors during wellbore survey operations. It is capable of determining errors on up to three axes, with or without the use of an external reference measurement of the local magnetic field, and is capable of providing an accurate re ...


5
John Harrell, Andrew G Brooks, Hatem Salem Morsy: Method and apparatus for mud pulse telemetry in underbalanced drilling systems. Baker Hughes Incorporated, Madan Mossman & Sriram P C, August 1, 2000: US06097310 (22 worldwide citation)

A mud pulse telemetry system uses a downhole pulser to produce sequences of positive and/or negative pulses according to a selected pattern. Positive pulses, negative pulses, and combinations thereof may be produced. A flow rate sensor at the surface measures changes in the flow rate at the top of t ...


6
Andrew G Brooks: Method of correcting for axial and transverse error components in magnetometer readings during wellbore survey operations. Baker Hughes Incorporated, Melvin A Felsman Bradley Gunter & Dillon Hunn, October 15, 1996: US05564193 (17 worldwide citation)

A method is disclosed for determining wellbore azimuth accurately, notwithstanding the corrupting influence of axial and transverse magnetic field biasing error components.


7
Andrew G Brooks: Method for magnetic survey calibration and estimation of uncertainty. Baker Hughes Incorporated, Madan Mossman & Sriram P C, January 30, 2001: US06179067 (16 worldwide citation)

The present invention provides a method for determining magnetometer errors during wellbore survey operations. It is capable of determining errors on up to three axes, with or without the use of an external reference measurement of the local magnetic field, and is capable of providing an accurate re ...


8
Roland E Chemali, Paul Cairns, Tsili Wang, Wallace H Meyer, Andrew G Brooks, Otto N Fanini, Gulamabbas Merchant: Method for signal enhancement in azimuthal propagation resistivity while drilling. Baker Hughes Incorporated, Madan Mossman & Sriram P C, May 20, 2008: US07375530 (10 worldwide citation)

Cross-component measurements made at a plurality of toolface angles are processed to remove bias. The amplitude of the resulting sinusoid is used to estimate a distance to an interface in an earth formation.


9
Andrew G Brooks: Method of correcting axial and transverse error components in magnetometer readings during wellbore survey operations. Baker Hughes Incorporated, Melvin A Hunn, April 22, 1997: US05623407 (10 worldwide citation)

The present invention is directed to a method for compensating V2 for bias error on one or more magnetometers used for one or more borehole directional surveys, comprising determining the constant or first-order varying bias values which minimize the variance of computed local magnetic field vectors ...


10
Andrew G Brooks: Method for estimating the probability of collision between wells. Baker Hughes Incorporated, Cantor Colburn, May 21, 2013: US08447522 (6 worldwide citation)

A method for drilling a well, the method including: identifying another well proximate to the well being drilled; collecting spatial information for at least a portion of the another well and the well being drilled; estimating a trajectory for at least a portion of the well being drilled and the ano ...