Petroleum Reservoir Evaluation and Development >

2023 , Vol. 13 >Issue 4: 459 - 466

DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2023.04.007

Comprehensive Research

Productivity evaluation of multi-stage fracturing horizontal wells in shale gas reservoir with complex artificial fracture occurrence

  • Zhijian HU ,
  • Shuxin LI ,
  • Jianjun WANG ,
  • Hong ZHOU ,
  • Yulong ZHAO ,
  • Liehui ZHANG
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  • 1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. PetroChina Coalbed Methane Company, Beijing 100028, China
    3. PetroChina Zhejiang Oilfield Company, Hangzhou, Zhejiang 310023, China
    4. Shunan Division, PetroChina Southwest Oil & Gas field Company, Luzhou, Sichuan 646001, China

Received date: 2022-03-07

  Online published: 2023-09-01

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Abstract

Considering complex shape and non-uniform distribution of fracturing fractures in shale reservoir, on the basis of multiple migration mechanisms a unified apparent permeability model is developed, incorporating two types of pore apparent permeability based on multiple migration mechanisms. This model serves as the foundation for establishing a gas reservoir-fracture-wellbore coupled seepage model, utilizing real space source function theory and pressure drawdown superposition principle. Through simulations and analyses, the study investigates the effects of micro seepage, fracture shape and non-uniform distribution of fractures on shale gas productivity. The demonstrate that micro seepage significantly impacts shale gas well production, with daily gas production being 20.3 % higher when considering micro seepage during the initial stage compared to neglecting it. Furthermore, the productivity of wells with complex fractures is lower than that of wells with ideal rectangular fractures, and star-shaped fractures exhibit the lowest productivity. The non-uniform distribution of fractures also affects the productivity of horizontal wells, and an optimal fracture layout is identified. The model takes into account both the micro seepage mechanism and actual fracturing fracture of shale gas, providing valuable guidance for the productivity research of fractured horizontal wells in shale gas reservoir.

Key words： shale gas; apparent permeability; fractured horizontal well; complex fracture; productivity model

Cite this article

Zhijian HU , Shuxin LI , Jianjun WANG , Hong ZHOU , Yulong ZHAO , Liehui ZHANG . Productivity evaluation of multi-stage fracturing horizontal wells in shale gas reservoir with complex artificial fracture occurrence[J]. Petroleum Reservoir Evaluation and Development, 2023 , 13(4) : 459 -466 . DOI: 10.13809/j.cnki.cn32-1825/te.2023.04.007

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