Patent ID: 9045969
Filing Date: 2015-06-02
Classification: E21B

Abstract:
1. A method, comprising: positioning a formation tester in a wellbore adjacent a subsurface layer of a formation, wherein the subsurface layer has a permeability of less than 0.1 millidarcy; extending packers from the formation tester to isolate an interval of the wellbore adjacent the subsurface layer of the formation; pumping fluid from a sample bottle of the formation tester into the subsurface layer of the formation through the isolated interval of the wellbore; inducing a fracture in the formation using the pumped fluid from the sample bottle; monitoring pressure of the isolated interval of the wellbore until a first drop in pressure is observed corresponding to inducing the fracture; stopping the pumping of fluid from the sample bottle into the subsurface layer of the formation when the fracture is extended to a predetermined length; monitoring pressure of the isolated interval of the wellbore until a second drop in pressure is observed corresponding to closure of the fracture; monitoring pressure of the isolated interval of the wellbore until a formation pseudo-radial or pseudo-linear flow is achieved; estimating pore pressure and transmissibility of the formation based on the monitored pressure and a volume of the fluid pumped into the subsurface layer of the formation.