Method of predicting mechanical failure in formation utilizing s

Details Method of predicting mechanical failure in formation utilizing s Method of predicting mechanical failure in formation utilizing s

1995-11-09

1997-04-08

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

181105, 367 35, 367 86, G01V 140

Patent

active

056194757

ABSTRACT:
A method for determining whether a formation is subject to incipient failure are disclosed. The method comprises determining in situ a nonlinear parameter of a formation, and determining whether the nonlinear parameter and/or a derivative of that nonlinear parameter as a function of stress has a relatively large negative value in order to determine whether the formation is subject to incipient failure. In a preferred embodiment, the nonlinear parameter of the formation is a derivative of the square of the shear or compressional velocity with respect to formation stress. The nonlinear parameter of the derivative of the square of the shear velocity with respect to stress is considered to have a large negative value when it is .ltoreq.-0.1 (km/sec).sup.2/ MPa, while the nonlinear parameter of the derivative of the square of the compressional velocity with respect to stress is considered to have a large negative value when it is .ltoreq.-0.2 (km/sec).sup.2 /MPa. The derivative of the derivative of the square of the shear or compressional velocity with respect to stress is considered to have a large negative value when the derivative is .ltoreq.-0.06 (km/sec).sup.2 /(MPa).sup.2. Typically, rocks will fail if uniaxially stressed between 11-5 MPa beyond any of those points.

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