Acoustic measurements in rock formations for determining fractur

Details Acoustic measurements in rock formations for determining fractur Acoustic measurements in rock formations for determining fractur

1986-08-12

1988-05-17

Levy, Stewart J.

Measuring and testing

Borehole or drilling

Downhole test

73801, 166250, E21B 4700

Patent

active

047442450

ABSTRACT:
A method and system for determining the probable direction of extension of a hydraulically induced fracture in a hydrocarbon bearing formation wherein prior to inducing the fracture, the formation region to be fractured is heated and thermally induced acoustic emissions from the formation are sensed to determine the orientation of the maximum and minimum horizontally directed in situ compressive stresses based on the acoustic emission rate and/or intensity. A device including a microwave energy generator and an array of acoustic transducers is lowered into a wellbore to generate and measure the thermally induced acoustic emissions.

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patent: 4107981 (1978-08-01), Kanagawa et al.
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patent: 4508168 (1985-04-01), Heeren
patent: 4524434 (1985-06-01), Silverman
D. M. Romrell et al., Monitoring . . . By Acoustic Emission, Materials Evaluation, vol. 28, Dec. 1978.
B. R. Dennis et al., Development . . . Fractures in Dry Hot Rock, Proc. 22nd International Instrumentation Symposium, May 25-27, 1976.

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