Liu Xianbo,Wang Shangwei,Liu Zhongneng,et al.Perforation parameter optimization based on casing damage effects in multistage fracturing[J].China Petroleum Machinery,2025,53(10):139-144.
Liu Xianbo,Wang Shangwei,Liu Zhongneng,et al.Perforation parameter optimization based on casing damage effects in multistage fracturing[J].China Petroleum Machinery,2025,53(10):139-144.DOI: 10.12473/CPM.202409053.
Perforation Parameter Optimization Based on Casing Damage Effects in Multistage Fracturing
Multistage fracturing is a key technology for achieving efficient development of shale oil in Changqing Oilfield, and the casing safety issues during multistage fracturing have attracted increasing attention. Based on impact dynamics principles, a numerical calculation model for perforation considering perforation-multistage fracturing operations was established. The plastic strain variation law of perforated casing during perforation and multistage fracturing processes was clarified, and the influence of perforation density and phase angle on the residual strength of casing after perforation-fracturing operations was revealed. The study results show that the cyclic internal pressure increases the damage of the perforated casing during multistage fracturing process. As the number of fracturing stages increases, the plastic strain of the perforated casing shows a stepwise increase trend, while the residual strength of the perforated casing exhibits a stepwise decrease trend correspondingly. Reasonable perforation parameters can simultaneously reduce the plastic deformation of casing during perforation and multistage fracturing processes, and enhance the residual strength of casing in production phase. For the DP41RDX32 perforation charge, the optimal perforation density is 18 perforations/m, with a phase angle of 90°. Under this operating condition, the degree of casing damage is the minimum during perforation and fracturing processes. The study results have reference significance for the optimization design of perforation parameters in shale oil horizontal wells in Changqing Oilfield.
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