Method for determining earth stresses in formations surrounding

Details Method for determining earth stresses in formations surrounding Method for determining earth stresses in formations surrounding

1990-01-18

1990-08-28

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

73151, G01V 140

Patent

active

049531379

ABSTRACT:
An acoustic logging tool traverses a fluid-filled cased well with a monopole acoustic energy source. Pressure waves in the well fluid by the source generate symmetric tube waves in the well casing immediately adjacent the source. At least one spaced-apart receiver detects these tube waves after they have traveled directly to the receiver through the well casing. Asymmetry imparted to said tube waves as they travel along the well casing by the maximum and minimum earth stresses behind the well casing are identified and used to predict the azimuthal direction of subsequent hydraulic fractures.

REFERENCES:
patent: 4542655 (1985-09-01), Park et al.
patent: 4641520 (1987-02-01), Mao
patent: 4781062 (1988-11-01), Taylor
patent: 4899320 (1990-02-01), Hearn et al.
Huang, C. F., et al., "The Correlation of Tube Wave Events with Open Fractures in Fluid Filled Boreholes," Geological Survey of Canada, 1981, pp. 336-376.

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