Abstract
This paper presents a semianalytical model to simulate the productivity of a volume fractured vertical well in tight oil reservoirs. In the proposed model, the reservoir is a composite system which contains two regions. The inner region is described as formation with finite conductivity hydraulic fracture network and the flow in fracture is assumed to be linear, while the outer region is simulated by the classical Warren-Root model where radial flow is applied. The transient rate is calculated, and flow patterns and characteristic flowing periods caused by volume fractured vertical well are analyzed. Combining the calculated results with actual production data at the decline stage shows a good fitting performance. Finally, the effects of some sensitive parameters on the type curves are also analyzed extensively. The results demonstrate that the effect of fracture length is more obvious than that of fracture conductivity on improving production in tight oil reservoirs. When the length and conductivity of main fracture are constant, the contribution of stimulated reservoir volume (SRV) to the cumulative oil production is not obvious. When the SRV is constant, the length of fracture should also be increased so as to improve the fracture penetration and well production.
Highlights
Reservoir stimulation technologies have been widely applied to develop tight oil reservoirs
This paper presents a semianalytical model to simulate the productivity of a volume fractured vertical well in tight oil reservoirs
We propose a semianalytical model to simulate the productivity of volume fractured vertical well in a tight oil reservoir by Laplace transform and Stehfest numerical inversion [18]
Summary
Reservoir stimulation technologies have been widely applied to develop tight oil reservoirs. Volume fracturing technique is one of these methods which has been widely used to improve the productivity of low permeability and tight reservoirs. Testing and evaluating fracture network reconstruction along the well and productivity behavior are essential for improving the performance of production well in tight reservoirs after volume fracturing. In terms of the analytic model, Liu et al [12, 13] and Lei and Gang [14] described the fracture distribution of volume transformation region of vertical wells by using the fractal theory, and the production of cold and heavy oil with carrying sand is studied based on their model. We propose a semianalytical model to simulate the productivity of volume fractured vertical well in a tight oil reservoir by Laplace transform and Stehfest numerical inversion [18]. The effects of some sensitive parameters, such as storage capacity ratio, crossflow coefficient, fracture conductivity, fracture length, stimulated volume, and skin factor on the type curve,s are analyzed extensively
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