Invention Application
US20090070042A1 JOINT INVERSION OF BOREHOLE ACOUSTIC RADIAL PROFILES FOR IN SITU STRESSES AS WELL AS THIRD-ORDER NONLINEAR DYNAMIC MODULI, LINEAR DYNAMIC ELASTIC MODULI, AND STATIC ELASTIC MODULI IN AN ISOTROPICALLY STRESSED REFERENCE STATE
审中-公开
作为第三阶非线性动态模态,线性动态弹性模态和静态弹性模态在等压应力参考状态下的应力场中的井眼声学径向剖面的联合反演
- Patent Title: JOINT INVERSION OF BOREHOLE ACOUSTIC RADIAL PROFILES FOR IN SITU STRESSES AS WELL AS THIRD-ORDER NONLINEAR DYNAMIC MODULI, LINEAR DYNAMIC ELASTIC MODULI, AND STATIC ELASTIC MODULI IN AN ISOTROPICALLY STRESSED REFERENCE STATE
- Patent Title (中): 作为第三阶非线性动态模态,线性动态弹性模态和静态弹性模态在等压应力参考状态下的应力场中的井眼声学径向剖面的联合反演
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Application No.: US12199243Application Date: 2008-08-27
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Publication No.: US20090070042A1Publication Date: 2009-03-12
- Inventor: Richard Birchwood , Saad Kisra
- Applicant: Richard Birchwood , Saad Kisra
- Main IPC: G01V1/40
- IPC: G01V1/40

Abstract:
A computer-implemented method of estimating mechanical properties and stresses of rocks around a borehole. In situ stresses and dynamic and static moduli of a rock are jointly inferred from acoustic radial profiles measured with a borehole sonic tool. Inversion is performed on equations that govern the near-borehole distributions of the compressional wave slowness, the fast shear wave slowness, the slow shear wave slowness, and the shear wave modulus in the plane perpendicular to the borehole axis for in situ stresses, the dynamic shear modulus, the dynamic Lamé parameter, λ, the static drained Young's modulus, and the static drained Poisson's ratio. Third-order nonlinear dynamic moduli are also inferred by the procedure. Material properties are retrieved in an isotropically stressed reference state. The input data used by the inversion is appropriately prescribed. Methods for constraining the solution in the event of noisy or limited data are demonstrated.
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