Estimating formation stress using borehole monopole and cross-di

Details Estimating formation stress using borehole monopole and cross-di Estimating formation stress using borehole monopole and cross-di

1999-01-15

2000-08-01

Oda, Christine

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

702 16, G01V 128

Patent

active

060980214

ABSTRACT:
A system and method to determine an in-situ stress field based on borehole acoustic monopole and cross-dipole measurements. A radially polarized monopole shear-wave is generated in a borehole. It is then determined whether the shear-wave has split into two shear-waves. If it has, the difference in velocities between the two split shear-waves is used to determine the stress induced anisotropy around and near the borehole. The difference in velocities of cross-dipole shear-waves and the direction of the fast shear-wave are measured and used to determine the magnitude of the maximum shear stress and the maximum stress orientation of the geologic formation. Furthermore, a method of determining the stress-velocity coupling coefficients from laboratory measurements as well as through field measurement calibration is disclosed. The effect of borehole pressure on the field measurement calibration method of determining the stress-velocity coupling coefficients is taken into account. Additionally disclosed is a method for defining a stress indicator that is related to stress-caused rock deformation. This stress indicator can be used to determine if rock failure is impending and is useful in sand control and borehole stability applications.

REFERENCES:
patent: 4832148 (1989-05-01), Becker et al.
patent: 4951267 (1990-08-01), Chang et al.
patent: 5675147 (1997-10-01), Ekstrom et al.
patent: 5808963 (1998-09-01), Esmersoy
patent: 5831934 (1998-11-01), Gill et al.
patent: 5852262 (1998-12-01), Gill et al.

Affiliated with

Also associated with

Rating

Estimating formation stress using borehole monopole and cross-di does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Estimating formation stress using borehole monopole and cross-di, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimating formation stress using borehole monopole and cross-di will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-673171