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Optimization of integrated geological-engineering design of volume fracturing with fan-shaped well pattern

Petroleum Exploration and Development 2023年第4期50卷 971-978页

作者： TANG Jizhou WANG Xiaohua DU Xianfei MA Bing ZHANG Fengshou School of Ocean and Earth Science Tongji UniversityShanghai 200092China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China College of Civil engineering Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical&Underground engineering of Ministry of Education Tongji UniversityShanghai 200092China Oil&Gas Technology Research Institute of PetroChina Changqing Oilfield Company Xi’an 710021China

According to the variable toe-to-heel well spacing, combined with the dislocation theory, discrete lattice method, and finite-element-method(FEM) based fluid-solid coupling, an integrated geological-engineering method of volume fracturing for fan-shaped well pattern is proposed considering the geomechanical modeling, induced stress calculation, hydraulic fracturing simulation, and post-frac productivity evaluation. Besides, we propose the differential fracturing design for the conventional productivity-area and the potential production area for fan-shaped horizontal wells. After the fracturing of the conventional production area for H1 fan-shaped well platform, the research shows that the maximum reduction of the horizontal principal stress difference in the potential productivity-area is 0.2 MPa, which cannot cause the stress reversal, but this reduction is still conducive to the lateral propagation of hydraulic fractures. According to the optimized fracturing design, in zone-Ⅰ of the potential production area, only Well 2 is fractured, with a cluster spacing of 30 m and an injection rate of 12 m^(3)/min per stage;in zone-Ⅱ, Well 2 is fractured before Well 3, with a cluster spacing of 30 m and an injection rate of 12 m^(3)/min per stage. The swept area of the pore pressure drop in the potential production area is small, showing that the reservoir is not well developed. The hydraulic fracturing in the toe area can be improved by, for example, properly densifying the fractures and adjusting the fracture distribution, in order to enhance the swept volume and increase the reservoir utilization.

关键词： shale oil fan-shaped well pattern horizontal well geological model hydraulic fracturing productivity evaluation integrated geological-engineering design

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