Effect of Stress-sensitivity on Well Test Curve Characteristics in Sandstone Gas Reservoirs
Received date: 2008-08-19
Revised date: 2008-09-19
Online published: 2009-04-10
In order to study the effect of stress-sensitive permeability on transient pressure in sandfacies, this paper uses the concept of permeability modulus, and presents a pressure transient well-test model for stress-sensitive fissured composite gas reservoirs, which includes strong nonlinear equations. Uses of transformation to linearize the equations have been presented to solve the nonlinear equations and to get zero\|order solution. The result is as follows: at the beginning, the characteristic curves of pseudo-pressure function and its derivative curves are linear lines and then they rise up with increase of dimensionless permeability modulus, which are similar to the model characteristic of no stress-sensitive fissured composite gas reservoirs with close out boundary or low permeability gas reservoirs.
Key words： Sandstone; Stress-sensitive; Gas reservoir; Well test curve; Effect.
TIAN Leng, HE Shun-Li, GU Dai-Hong . Effect of Stress-sensitivity on Well Test Curve Characteristics in Sandstone Gas Reservoirs[J]. Natural Gas Geoscience, 2009 , 20(2) : 297 -299 . DOI: 10.11764/j.issn.1672-1926.2009.02.297
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