Study on Deliverability Evaluation of Staged Fractured Horizontal Wells in Tight Oil Reservoirs

Siyu Liu, Shengchun Xiong, Dingwei Weng, Peng Song, Rou Chen, Ying He, Xuewei Liu and Shasha Chu
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Siyu Liu: University of Chinese Academy of Sciences, Beijing 100049, China
Shengchun Xiong: University of Chinese Academy of Sciences, Beijing 100049, China
Dingwei Weng: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Peng Song: Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi’an 710018, China
Rou Chen: College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Ying He: Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
Xuewei Liu: Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
Shasha Chu: Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China

Energies, 2021, vol. 14, issue 18, 1-21

Abstract: At present, the existing deliverability evaluation models mainly consider the impact of specific factors on production, and the description of the complex fracture network structure primarily remains at the stage of an ideal dual-pore medium with uniform distribution. However, this cannot reflect the actual fracture network structure and fluid flow law of fractured horizontal wells. Thus, in this paper, a non-uniform fracture network structure is proposed considering the influence of the threshold pressure gradient and stress sensitivity characteristics on the production performance of horizontal wells. The stress sensitivity and the fractal theory are combined to characterize the permeability of the complex fracture network, and a three-zone compound unsteady deliverability model for staged fractured horizontal wells in tight oil reservoirs is successfully developed. Laplace transformation, perturbation theory, and numerical inversion are applied to obtain the semi-analytical solution of the proposed deliverability model. The reliability and accuracy of the analytical solution are verified by the classical tri-linear flow model and an oil field example. The effects of related influential parameters on the production of horizontal wells are analyzed. The deliverability evaluation method proposed in this paper can provide a theoretical basis for formulating rational development technology policies for tight oil reservoirs.

Keywords: tight oil reservoirs; staged fractured horizontal wells; fracture network; fractal; deliverability evaluation (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: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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