Abstract
In order to investigate pressure performance of multiple fractured horizontal wells (MFHWs) penetrating heterogeneous unconventional reservoir and avoid the high computational cost of numerical simulation, a semi-analytical model for MFHWs combining Green function solution and boundary element method has been obtained, where the reservoir is divided into different homogeneous substructures and coupled at interface boundaries by plane source function in a closed rectangular parallelepiped. Hydraulic fractures are assumed uniform flux and dual porosity model is used for natural fractures system. Then the model is validated by compared with analytical solution of MFHWs in a homogeneous reservoir and trilinear flow model, which shows that this model can achieve high accuracy even with a small interface discretization number, and it can consider the radial flow around each hydraulic fractures. Finally, the pressure responses with heterogeneous parameters of reservoirs are discussed including heterogeneous permeability, non-uniform block-length and fracture half-length distribution as well as dual porosity parameters like elastic storage ratio and crossflow ratio.
Highlights
With the rapid development of unconventional reservoirs, the horizontal well intercepted by hydraulic fractures has become the main technology [1,2], which can significantly increase contact areas between fractures and formation zone
A Multiple fractured horizontal well passing through a heterogeneous reservoir with different properties is shown in Figure 1, where each block is the subsections of the reservoir characterized by uniform average properties
In order to verify the accuracy of our model, a relatively simple model of multiple fractured horizontal wells (MFHWs) is discussed, which located in the center of a closed, homogenous- and single-porosity media, rectangular reservoir with three blocks
Summary
With the rapid development of unconventional reservoirs, the horizontal well intercepted by hydraulic fractures has become the main technology [1,2], which can significantly increase contact areas between fractures and formation zone. The numerical simulation is an effective method to model the flow performance of MFHWs, which can deal with the formation heterogeneity . Based on the element boundary method and Green’s function, Medeiros [30] (2010) presented a semi-analytical model for the pressure transient analysis of horizontal wells in heterogeneous reservoirs. Based on the fact that the main contribution for hydrocarbon flow rate of MFHWs is the SRV area [31], so this paper is to build a semi-analytical model for MFHWs in heterogeneous stimulated reservoir volume of naturally fractured media. To avoid fine grid of numerical reservoir simulator around fractures and wells, the plane source functions in the closed domain and boundary element method are applied, where stimulated reservoir volume is divided into compartmentalized heterogeneous blocks. Heterogeneous effects on pressure and production performance are presented
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