Simulation of a multistage fractured horizontal well in a water-bearing tight fractured gas reservoir under non-Darcy flow

被引:17
|
作者
Zhang, Rui-Han [1 ]
Zhang, Lie-Hui [1 ]
Wang, Rui-He [2 ]
Zhao, Yu-Long [1 ]
Huang, Rui [2 ]
机构
[1] Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China
[2] Richfit Informat Technol Co Ltd, CNPC, Beijing 100007, Peoples R China
基金
中国国家自然科学基金;
关键词
CVFE method; multistage fractured horizontal well; non-Darcy flow; stimulated reservoir volume (SRV); tight fractured gas reservoir; FINITE-ELEMENT; SEMIANALYTICAL MODEL; NUMERICAL-SIMULATION; MULTIPHASE FLOW; SINGLE-PHASE; SAND GAS; PERFORMANCE; VOLUME; PERMEABILITY; TRANSPORT;
D O I
10.1088/1742-2140/aaa5ce
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Reservoir development for unconventional resources such as tight gas reservoirs is in increasing demand due to the rapid decline of production in conventional reserves. Compared with conventional reservoirs, fluid flow in water-bearing tight gas reservoirs is subject to more nonlinear multiphase flow and gas slippage in nano/micro matrix pores because of the strong collisions between rock and gas molecules. Economic gas production from tight gas reservoirs depends on extensive application of water-based hydraulic fracturing of horizontal wells, associated with non-Darcy flow at a high flow rate, geomechanical stress sensitivity of un-propped natural fractures, complex flow geometry and multiscale heterogeneity. How to efficiently and accurately predict the production performance of a multistage fractured horizontal well (MFHW) is challenging. In this paper, a novel multicontinuum, multimechanism, two-phase simulator is established based on unstructured meshes and the control volume finite element method to analyze the production performance of MFHWs. The multiple interacting continua model and discrete fracture model are coupled to integrate the unstimulated fractured reservoir, induced fracture networks (stimulated reservoir volumes, SRVs) and irregular discrete hydraulic fractures. Several simulations and sensitivity analyses are performed with the developed simulator for determining the key factors affecting the production performance of MFHWs. Two widely applied fracturing models, classic hydraulic fracturing which generates long double-wing fractures and the volumetric fracturing aimed at creating large SRVs, are compared to identify which of them can make better use of tight gas reserves.
引用
收藏
页码:877 / 894
页数:18
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