A Fractional Step Method to Solve Productivity Model of Horizontal Wells Based on Heterogeneous Structure of Fracture Network

Shengchun Xiong, Siyu Liu, Dingwei Weng, Rui Shen, Jiayi Yu, Xuemei Yan, Ying He and Shasha Chu
Additional contact information
Shengchun Xiong: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Siyu Liu: CNOOC China Limited, Shenzhen Branch, Shenzhen 518054, China
Dingwei Weng: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Rui Shen: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Jiayi Yu: PetroChina Research Institute of Exploration and Development, Tuha Oilfield Company, Hami 839000, China
Xuemei Yan: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Ying He: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Shasha Chu: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Energies, 2022, vol. 15, issue 11, 1-26

Abstract: The existing productivity models of staged fractured horizontal wells in tight oil reservoir are mainly linear flow models based on the idealized dual-medium fracture network structure, which have a certain limitation when applied to the production prediction. Aiming at the difficulty in describing the shape of the complex fractal fracture network, a two-dimensional heterogeneous structure model of the fracture network is proposed in this paper. Considering the deformation characteristics of porous media and the characteristic of non-Darcy fluid flow, a three-zone steady-state productivity model with the combination of radial and linear flow is established. To eliminate strong nonlinear characteristics of the mathematical model, a fractional step method is employed to deduce the production formulas of staged fractured horizontal wells under infinite and finite conductivity fractures. The established productivity model is verified with the actual data of three horizontal wells in different blocks of S oilfield, and the error between the model calculation results and the actual production data is less than 4%. The analysis results of productivity sensitive factors show that production of horizontal wells is primarily influenced by the reservoir physical properties and fracturing parameters. The steady-state productivity model established in this study can be applied to effectively predict the average production of a horizontal well in stable stage of production, and it has theoretical and practical application value for improving the development effect of tight oil reservoir.

Keywords: tight oil reservoirs; staged fractured horizontal wells; productivity model; heterogeneous structure of the fracture network; deformation characteristics of porous media; fractional step mothed; infinite and finite conductivity; fractal (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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