长庆油田注水井复合射孔储层伤害数值模拟研究

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中图分类号：TE934文献标识码：ADOI：10.12473/CPM.202408010

Abstract： The reservoirs in Changqing Oilfield are typically low porosity and low permeability，making conventional perforation operations impossible to effctively improve the near welbore permeabilityrequired for water injection.Basedonthe principleof impact dynamics，together with thedistributioncharacteristics of perforation compaction zones，a numerical calculation model for reservoir damage by composite perforation was built，and the evaluation indexes of reservoir damage by composite perforation were proposed.The distribution characteristics of fracture zones formed bycomposite perforation were explained，and the influences of perforation parameters（perforation density，phase angle）and formation properties （in-situ stress，rock strength）on reservoir damage by compositeperforation were revealed.The study results show thatthe larger the perforationdensity，the larger the fracture area formed near the wellbore.When the phase angle issmall，there is a better effectof penetrating the compaction zone near the welbore.When the phase angle is large，a larger penetration depthcan be formed for the compaction zoneattheendofthe channel.When the in-situstress and rock strengtharesmall，theaxialand radial blockage removal efects of the compaction zone are bettr.The calculation and analysis ofcase wells showthat the composite perforationcan realize blockage removal ofcompaction zone nearthe wellboreand the end of the channel，and efectively realize theconnection between the perforationchannel and the reservoir.The reason for under injection may be low reservoir permeabilityandsevere pore filing.Itisproposedto adopta super-energy perforation-alternating injectionacid fracturing combined operation mode in target wells to improve injection conditions.The study results have reference significance for the stimulation response evaluation of composite perforation and the optimization of perforation parameters.

Keywords： water injection well; impact dynamics；perforation compaction zone； composite perforation； res. ervoir damage ;response evaluation ;changqing oilfield

0 引言

长庆油田储集层是典型的低孔、低渗储集层，需要进行射孔作业以提高单井产量。（剩余16828字）