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Birchwood
Richard Birchwood, Houston, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20090070042 | 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 - 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. | 03-12-2009 |
Richard A. Birchwood, Houston, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20110042080 | DETERMINING FRACTURE ORIENTATION USING WELLBORE ACOUSTIC RADIAL PROFILES - A method for performing field operations including obtaining a first set of acoustic radial profiles of a subterranean formation prior to induction of a fracture disposed about the wellbore, obtaining a second set of acoustic radial profiles of the subterranean formation subsequent to the induction of the fracture, comparing the first set of acoustic radial profiles and the second set of acoustic radial profiles based on a pre-determined criterion to generate a comparison result, determining, based on the comparison result, an orientation of one or more portions of the fracture, and adjusting the operations of the oilfield based on the orientation. | 02-24-2011 |
Richard Anthony Birchwood, Houston, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20100017136 | ESTIMATING IN SITU MECHANICAL PROPERTIES OF SEDIMENTS CONTAINING GAS HYDRATES - A method for constructing elastoplastic property correlations in multicomponent particulate systems. The method includes obtaining parameters from geophysical data of a sediment-hydrate system, where the parameters include s | 01-21-2010 |