调剖、调驱剂注入压力对分流率的影响及作用机理*

Influence of Injection Pressure of Profile Control and Displacement Agent on Diversion Rate and Its Mechanism

高建崇 张 楠 王 琳 卢祥国 薛宝庆 李彦阅 何 欣

GAO Jianchong ZHANG Nan WANG Lin LU Xiangguo XUE Baoqing LI Yanyue HE Xin

渤海LD5-2油田具有平均渗透率较高和非均质性较严重等特点，长期高强度水驱进一步加剧了储层间非 均质性，亟待采取调剖调驱措施来实现深部液流转向。本文以LD5-2储层特征为模拟对象，采用三并联岩心实 验开展了调剖调驱剂注入压力对分流率影响及作用机制研究。结果表明，微球颗粒易于在岩心注入端端面滞 留，引起注入压力“虚高”，液流转向效果较差。与微球类调驱剂相比，聚合物凝胶类调剖剂注入能力较强，易于 进入岩心深部和发生滞留，附加渗流阻力和注入压力增幅较大。随注入压力升高，中低渗透层对调驱剂和调剖 剂吸液量增加，滞留作用引起附加渗流阻力增加，液流转向效果变差，因此，采取合理注入压力有助于改善调剖 调驱液流转向效果。建议矿场实施调剖调驱措施前开展注入井吸液剖面测试，据此确定调驱剂和调剖剂最高注 入压力或注入速率。图16表2参20

The physical properties of the reservoir in the Bohai LD5-2 oilfield are characteristic of high permeability and strong heterogeneity. Long-term water flood development has further exacerbated heterogeneity between reservoirs. It is urgent to take flood control measures to realize deep fluid flow diversion. In this article，profile control and displacement were tested for injection pressure. The characteristics of LD5-2 reservoir were taken as the research object. The indoor three-tube parallel experiment was used to study the effect of injection pressure on the liquid absorption profile of the reservoir. The test results showed that microsphere particles are susceptible to stagnate on the end face of the core injection end，which caused the injection pressure to be "virtually high"，as a result，the liquid flow diverting effect was eventually weakened. Compared with microsphere-based flooding agents，polymer gel-based profile-controlling agents had a stronger injection capacity，and were more likely to enter deep cores and cause retention. The added seepage resistance and injection pressure increased significantly. With the increase of injection pressure， the liquid absorption of the middle and low permeability layers increased，the additional seepage resistance increased due to the retention effect，and the liquid flow diverting effect became worse. Therefore，adopting a reasonable injection pressure could help improve profile and flood control flow diverting effect. It was recommended to carry out the liquid absorption profile test of the injection well before implementing the profile adjustment measures at the mine to determine the maximum injection pressure or injection speed of the agent.

10.19346/j.cnki.1000-4092.2021.03.009