Abstract
After multistage fracturing, the flowback of fracturing fluid will cause two-phase flow through hydraulic fractures in shale gas reservoirs. With the consideration of two-phase flow and desorbed gas transient diffusion in shale gas reservoirs, a two-phase transient flow model of multistage fractured horizontal well in shale gas reservoirs was created. Accurate solution to this flow model is obtained by the use of source function theory, Laplace transform, three-dimensional eigenvalue method, and orthogonal transformation. According to the model’s solution, the bilogarithmic type curves of the two-phase model are illustrated, and the production decline performance under the effects of hydraulic fractures and shale gas reservoir properties are discussed. The result obtained in this paper has important significance to understand pressure response characteristics and production decline law of two-phase flow in shale gas reservoirs. Moreover, it provides the theoretical basis for exploiting this reservoir efficiently.
Highlights
In order to obtain industrial gas flow, horizontal drilling and multistage hydraulic fracturing techniques have been widely used in Shale gas reservoir (SGR) development
Numerous researchers have studied migration mechanisms in SGR, but the two-phase flow caused by multistage hydraulic fracturing is usually ignored for analyzing and forecasting a shale gas well
Montgomery et al [2] pointed out that the absorbed gas in SGR is mainly stored in pores, natural fractures, and matrix surface and desorption rate would change with the difference of desorption time, desorption pressure, and organic matter volume
Summary
In order to obtain industrial gas flow, horizontal drilling and multistage hydraulic fracturing techniques have been widely used in SGR (shale gas reservoirs) development. Numerous researchers have studied migration mechanisms in SGR, but the two-phase flow caused by multistage hydraulic fracturing is usually ignored for analyzing and forecasting a shale gas well. Freeman et al [3] and Cheng [4] employed a numerical simulator to study the flow regimes for a multistage hydraulic fractured horizontal well in SGR and the effect of gas desorption was briefly discussed. Tan et al [6] presented a dual fractal reservoir transient flow model created by embedding a fracture system simulated by a treeshaped fractal network into a matrix system simulated by fractal porous media and discussed the influence of different fractal factors on pressure transient responses. Medeiros et al [14] discussed the analysis of production data from hydraulically fractured horizontal wells in shale reservoirs. The influence of different factors on production decline performance is discussed
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