射孔间距-倾角对深煤层水力裂缝扩展影响的离散元分析
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中海油十四五重点规划课题(编号:CCL2022RCPS0471RSN)


Discrete element analysis of the effect of perforation spacing-inclination on hydraulic fracture propagation in deep coal seam
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    摘要:

    研究煤岩储层裂缝扩展的影响因素,对提高煤层气采收率十分重要。为探究不同射孔间距-倾角对深层煤岩裂缝扩展规律的影响,利用离散元分析方法,考虑井周煤岩应力变化特征、最大周向应力准则、原始储层等条件,研究射孔间距-倾角对压裂缝网扩展形态及延伸范围的影响规律。模拟结果表明:随射孔间距从40 mm变化至100 mm,当间距为60 mm时裂缝条数数量最多;当射孔倾角从15°到60°变化时,当射孔角度为45°时,缝网形态最为复杂;即射孔间距为60 mm且射孔倾角为θ=45°时,水力裂缝的缝网形态复杂度显著增大,缝网扩展范围最大。通过神府北木瓜区Y-1井验证,预测结果与实测数据具有一致性,证明所建煤岩数值模型的正确性。

    Abstract:

    It is very important to study the influencing factors of fracture propagation in coal-rock reservoirs to improve the recovery rate of coalbed methane. In order to explore the influence of different perforation spacing-dip angles on the fracture propagation law of deep coal and rock, the discrete element analysis method was used to study the influence of perforation spacing-dip angle on the expansion form and extension range of fracture network by considering the stress change characteristics of coal and rock around the well, the maximum circumferential stress criterion, the original reservoir and other conditions. The simulation results show that with the change of perforation spacing from 40 mm to 100 mm, the number of cracks is the largest when the spacing is 60 mm. When the perforation inclination angle varies from 15° to 60°, when the perforation angle is 45°, the seam mesh morphology is the most complex. That is, when the perforation spacing is 60 mm and the perforation inclination angle is θ=45°, the morphological complexity of the fracture network of hydraulic fractures increases significantly, and the expansion range of the fracture network is the largest. Through the verification of Well Y-1 in Shenfu North Papaya District, the prediction results are consistent with the measured data, which proves the correctness of the numerical model of coal and rock.

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安果涛,谢昕,孔祥伟,等. 射孔间距-倾角对深煤层水力裂缝扩展影响的离散元分析[J]. 科学技术与工程, 2024, 24(18): 7623-7629.
An Guotao, Xie Xin, Kong Xiangwei, et al. Discrete element analysis of the effect of perforation spacing-inclination on hydraulic fracture propagation in deep coal seam[J]. Science Technology and Engineering,2024,24(18):7623-7629.

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  • 收稿日期:2023-07-03
  • 最后修改日期:2024-06-21
  • 录用日期:2023-11-14
  • 在线发布日期: 2024-07-05
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