Baker Hughes Corporation

James C Jackson

Min Lou

Xiaomin Zhao

Francis D Doherty

Otto N Fanini

Robert H McCoy

Jesse J Constantine, Jr

Jose Rene Casarsa

Jorn Andre Carlsen

Neil E Peake

Les A Morrison

Robert H Mccoy

A walkaway VSP survey is carried out with receivers located in a borehole under a salt overhang. Redatuming of the multicomponent data to virtual sources in the borehole followed by vector Kirchhoff migration using a simple velocity model provides an accurate image of the salt face.

Vector migration of virtual source VSP data

A walkaway VSP survey is carried out with receivers located in a borehole near the base salt. Reflection tomographic inversion of data from the walkaway VSP is used to derive a velocity model for the subsurface and may be used for imaging of sub-salt reflections.

Sub-salt reflection tomography and imaging by walkaway VSP survey

1order free-surface multiples recorded in VSP data or reverse VSP data are processed using a 3-C 3-D vector migration method to produce an image of the subsurface. This image produces a larger coverage than that obtained in 3-C 3-D processing of reflection data acquired in the VSP.

Vector migration of 1st order free-surface related downgoing multiples from VSP data

A system for acquiring logging data comprises a controller for causing the generation of a signal in a formation surrounding a wellbore. The controller has a first clock for time-stamping a record of the generated signal. A receiver is deployed in the wellbore and is adapted for detecting the signal. A second clock comprises a double-oven surrounding a crystal oscillator. A controller is operatively coupled to the double-oven to maintain the crystal oscillator temperature substantially at the crystal oscillator turnover temperature. The second clock is synchronized with the first clock before deployment in the wellbore, and the receiver references the second clock in order to record a time-stamp associated with the detected signal.

Apparatus and methods for acquiring seismic data while tripping

Seismic data is collected by using an electrical submersible pump assembly in a well that is producing well fluid. By sweeping the rotational speed of the pump assembly through a selected range at selected intervals, seismic waves of varying frequency are emitted. These seismic waves are then picked up with a seismic sensor located at the surface or located in another well. If the seismic sensors are located in another well, the signal from the sensor may be transmitted to the surface by superimposing the data onto the power cable leading to the pump located in that other well. The seismic survey may be repeated at regular intervals, and the results will reveal the changes that have taken place over time in the reservoir.

Seismic analysis using electrical submersible pump

Methods and apparatus are adapted for acquiring seismic data from an array of sensors deployed along a section of a deviated, including horizontal, wellbore for monitoring seismic and microseismic activity. The sensors may be permanently deployed in the wellbore.

System and method for acquiring seismic and micro-seismic data in deviated wellbores

A method is described for acquiring seismic data while removing, or tripping, a drill string from a wellbore. The method comprises, conveying an autonomous seismic receiver down a fluid passage in the drill string to a predetermined location proximate a lower end of the drill string; generating signals by a seismic source near a surface location; detecting the seismic signals with at least one sensor in the seismic receiver at least one predetermined location of interest in the wellbore as the drill string is removed from the wellbore; and storing the detected seismic signals in the seismic receiver.

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Houston, TX, United States of America

James C Jackson