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Dynamic Pressure Behavior in Vertically Fractured Wells of Tight Reservoir |
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Abstract: For non-Darcy flows of tight reservoir and special flow patterns in vertically fractured well, a trilinear flow model is developed to study the early-time and immediate-time flow stages, taking the effect of wellbore storage and the skin effect of vertical fracture into consideration. The effective wellbore radius is used to describe the effect of the threshold pressure gradient in the latter time flow regime. Combining the trilinear flow model with the effective wellbore radius, a transient flow well-testing model in tight reservoir is built, which is solved by the least squares method. At the same time, an analysis is made based on these solutions that include the effects of various parameters, such as the fracture conductivity, the skin on the fracture, and the threshold pressure gradient. It is shown that the larger the dimensionless fracture conductivity and the smaller the pressure drop, the smaller the energy loss will be; the pressure response in early-time and intermediate-time stages is mainly influenced by the skin factor; the larger the threshold pressure gradient and the more significant the dimensionless pressure increase, the larger the energy loss will be in the later stage.
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Received: 03 June 2010
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