Numerical Simulation of Well Type Optimization in Tridimensional Development of Multi-Layer Shale Gas Reservoir

Tao Huang, Xin Liao, Zhaoqin Huang, Fuquan Song and Renyi Wang
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Tao Huang: School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China
Xin Liao: School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China
Zhaoqin Huang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Fuquan Song: School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China
Renyi Wang: School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China

Energies, 2022, vol. 15, issue 18, 1-20

Abstract: Aimed at the development of shale gas reservoirs with large reservoir thickness and multiple layers, this paper carried out a numerical simulation study on the optimization of three different well types: horizontal well, deviated well, and vertical well. To make the model more in line with the characteristics of shale gas reservoirs, a two-phase gas–water seepage mathematical model of shale gas reservoirs was established, considering the adsorption and desorption of shale gas, Knudsen diffusion effect, and stress sensitivity effect. The embedded discrete fracture model was used to describe hydraulic fracture and natural fracture. Based on Fortran language, a numerical simulator for multi-layer development of shale gas reservoirs was compiled, and the calculation results were compared with the actual production data of Barnett shale gas reservoirs to verify the reliability of the numerical simulator. The spread range of hydraulic fractures in the reservoir with different natural fracture densities is calculated by the simulation to determine well spacing and fracture spacing. The orthogonal experimental design method is then used to optimize the best combination of well spacing and fracture spacing for different well types. The results show that the well productivity of the high-density (0.012 m/m 2 ) natural fractures reservoir > the well productivity of the medium-density (0.006 m/m 2 ) natural fractures reservoir > the well productivity of the low-density (0.001 m/m 2 ) natural fractures reservoir. According to the design of the orthogonal test, it can be seen that the most significant factor affecting the productivity of horizontal wells is the fracture spacing in the Y direction. For deviated wells and vertical wells, the X-direction well spacing has the greatest impact on its productivity.

Keywords: shale gas reservoir; multi-layer development; numerical simulation; well-type optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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