Patent ID: 7313481
Filing Date: 2007-12-25
Classification: E21B,G01N,G01V

Abstract:
1. A method of determining a property of an earth formation, the method comprising: (a) generating a fluid hammer in a borehole in the earth formation, the fluid hammer producing a pressure pulse in the fluid, the pressure pulse propagating in the borehole at velocity determined at least in part by a shear velocity of the formation; (b) making a measurement indicative of a pressure of the fluid at at least one location in the borehole; (c) estimating a value of the property of the formation using the measured fluid pressure and a model of the borehole and the earth formation, the model including a plurality of layers, at least one of the plurality of layers including concentric radial layering; and (d) using the estimated value of the property in development of the borehole.