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System and method for investigating sub-surface features of a rock formation

A rock formation, technique of modulating signals, applied in the third wave realm

Inactive Publication Date: 2013-09-25
CHEVROU USA INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Various attempts have been made to characterize the nonlinear properties of formations in oil and gas regions explored from boreholes, but each has its own limitations

Method used

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  • System and method for investigating sub-surface features of a rock formation
  • System and method for investigating sub-surface features of a rock formation
  • System and method for investigating sub-surface features of a rock formation

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Embodiment Construction

[0041] figure 1 One of several possible configurations for creating a three-dimensional image of the compression velocity to shear velocity ratio and nonlinear properties in regions remote from the wellbore is shown, according to various aspects of the present disclosure. A first sound source 105 is disposed in the borehole 110 to generate 1 Steerable beam of primary acoustic energy. A second sound source 115 is also disposed in the borehole 110 to generate 2 Steerable beam of primary acoustic energy. By way of non-limiting example, both the first acoustic source 105 and the second acoustic source 115 may be a phased array of sources and may be configured to generate a steerable compressed or sheared beam. In this disclosure, the term "acoustic" may refer to P, SV or SH acoustic modes.

[0042] Such as figure 1 As shown, the first sound source 105 is disposed on the first tool body 120 and the second sound source 115 is disposed on the second tool body 125 . However, the...

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Abstract

A method and system for investigating rock formations outside a borehole are provided. The method includes generating a first acoustic wave at a first frequency by a first acoustic source; and generating a second acoustic wave at a second frequency by a second acoustic source. The first and the second acoustic sources are arranged within a localized area of the borehole. The first and the second acoustic waves intersect in an intersection volume outside the borehole. The method further includes receiving a third acoustic wave at a third frequency, the third shear acoustic wave returning to the borehole due to a non-linear mixing process in a non-linear mixing zone within the intersection volume at a receiver arranged in the borehole. The third frequency is equal to a difference between the first frequency and the second frequency.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Patent Application No. 61 / 413,172, filed November 12, 2010, which is hereby incorporated by reference in its entirety. [0003] government rights [0004] This invention was made with Government support under Cooperative Research and Development Agreement (CRADA) Contract No. DE-AC52-06NA25396 awarded by the US Department of Energy, which may have certain rights in the invention. technical field [0005] The present invention relates generally to seismic interrogation of rock formations, and more particularly to the use of a combination of sources in a wellbore to create a three-dimensional image, and the resulting third wave is received and analyzed through a mixing process. Background technique [0006] Acoustic interrogation of subsurface features tends to be limited by the size and power of practical sources, and in practice, the output of downhole acoustic transducers is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00G01V1/46
CPCA61P35/00G01V1/006G01V1/46G01V2210/125G01V2210/127G01V2210/588G10K15/02G01V1/44G01V1/50G01V1/52
Inventor C·K·武C·H·斯克勒K·T·尼赫尔P·A·约翰松R·A·谷野J·A·藤凯特P-Y·莱巴斯C·S·拉尔马特
Owner CHEVROU USA INC
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