Scientific Drilling International, Inc.

Timothy Whitacre

Matthew A White

Brian Daniel Gleason

Mohamed Youssef

Pong Pipatwit

Brian Gleason

Peter Smidth

Brett H Van Steenwyk

Benjamin C Hawkinson

A method includes providing a Bottom Hole Assembly (BHA) in a wellbore. The BHA includes a rotary steerable system and a downhole attitude correction and control system. The downhole correction and control system includes a first sensor set, the sensors of the first sensor set positioned near ferromagnetic components of a drill string and a second sensor set, the sensors of the second sensor set positioned further from the ferromagnetic components of the drill string than the sensors of the first sensor set. Corrupted data from the first sensor set and reference data from the second sensor set is obtained, the corrupted data including cross-axis magnetometer and accelerometer measurements. The method additionally includes correcting the corrupted sensor data to form corrected sensor measurements and calculating an estimated azimuth from the corrected sensor measurements. The method further includes steering the rotary steerable system based on the estimated azimuth.

In-situ downhole measurement correction and control

A signal method may include obtaining a first set of signal measurements, processing the first set of signal measurements into a phase reference obtaining a second set of signal measurements, the second set of signal measurements varying as a function of the phase reference, detecting an item of interest using the second set of signal measurements and the phase reference, and using the item of interest.

Coherent measurement method for downhole applications

A method may include providing one or more telemetry transmission systems, the one or more transmission systems comprising one or more receivers and one or more transmitters. The method may also include transmitting a first synchronization sequence from the one or more telemetry transmission systems, the first synchronization sequence transmitted in a first channel, and the first synchronization sequence being at least a portion of a first telemetry signal. In addition, the method may include transmitting a second synchronization sequence the one or more telemetry transmission systems, the second synchronization sequence transmitted in a second channel, and the second synchronization sequence being at least a portion of a second telemetry signal. The first and second synchronization sequences may be transmitted simultaneously or at a predetermined time difference. The method may include receiving the first synchronization sequence at the one or more receivers, and receiving the second synchronization sequence at the one or more receivers.

Collaborative telemetry

A steering tool may include a tool body, gimbal body rotatably coupled to the tool body, and an angular positioning device to rotate the gimbal body relative to the tool body. One or more sensors may be coupled to the gimbal body. The sensors may be one or more gyros, accelerometers, and magnetometers. A gyro may be aligned with the axis of rotation of the gimbal body and may be used to detect rotation of the gimbal body. The detected rotation may be used to stabilize the gimbal body by using the angular positioning device. A gimbal toolface angle relative to a reference frame may be determined based on readings of one or more of the sensors. The gimbal body may be rotated to align with a reference position by the angular positioning device and rotated to one or more other gimbal toolface angles, at which sensor readings may be taken.

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Paso Robles, CA, United States of America

Timothy Whitacre