Estimating permeability in unconventional subterranean reservoirs using diagnostic fracture injection tests

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United States of America Patent

PATENT NO 9556729
APP PUB NO 20160230547A1
SERIAL NO

14429322

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Abstract

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In an example diagnostic fracture injection test (DFIT), or a “minifrac,” a fracturing fluid is pumped at a relatively constant rate and high pressure to achieve a fracture pressure of a subterranean formation. Sometime after achieving formation fracture pressure, the pump is shut off and the well is shut in, such that the pressure within the sealed portion of the well equilibrates with the pressure of the subterranean formation. As the pressure declines, the pressure of the injection fluid is monitored. This collected pressure data is then used to determine information regarding the permeability of the subterranean formation. In some implementations, a model for before closure analysis (BCA) can be used to estimate the permeability of a formation based on before closure pressure data (i.e., data collected before the fracture closure pressure is reached) based on a solution to the rigorous flow equation of fracturing fluid, which is leaking off into the formation during fracture closure.

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Patent Owner(s)

  • HALLIBURTON ENERGY SERVICES, INC.;PETRO RESEARCH & ANALYSIS CORP.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lamei, Christopher Hoss Wolfforth, US 1 2
Soliman, Mohamed Yousef Lubbock, US 7 76

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