Gao Jianchong, Lu Xiangguo, He Xin, Liu Jinxiang, Zheng Kaiqi, Cao Weijia, Cui Tianyu, Sun Huiru
Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education, Northeast Petroleum University, Daqing 163318, China.
Liaodong Operation Area of Tianjin Branch of CNOOC, Tianjin 300452, China.
Gels. 2022 Jun 22;8(7):396. doi: 10.3390/gels8070396.
The existing plugging removal operation in JZ9-3 oilfield has the disadvantages of small amount of plugging remover, fast injection speed, and short construction time. Under the condition of injection well suction profile reversal, plugging remover is difficult to enter the low permeability part and play the role of deep plugging removal. In order to improve the plugging removal effect, this paper used the physical simulation method to carry out the experimental study and mechanism analysis on the effect of water flooding, chemical flooding, and plugging removal measures of the multi-layer system combination model. The results showed that the recovery of general plugging removal after chemical flooding increases by only 0.70%, while the recovery of 'profile control + plugging removal' increases by '9.34% + 2.59%', and the amount of produced liquid decreases by more than 40%. It can be seen that the combined operation of profile control and plugging removal has dual effects of plugging and dredging and synergistic effect, which not only expands the swept volume, but also reduces the inefficient and ineffective cycles. On this basis, the optimization design and effect prediction of the target well W4-2 plugging removal scheme were carried out by using the numerical simulation method. Recommended scheme: inorganic gel profile control agent volume 13,243.6 m, produced by the main agent (NaO·nSiO), isolation fluid (Water), and auxiliary agent (CaCl) through multiple rounds of alternating injection into the reservoir. The plug removal agent (KSO) injection volume is 100 m, the concentration is 0.8%. The post-implementation 'Output/Input' ratio is expected to be 3.7.
锦州9-3油田现有的解堵作业存在解堵剂用量少、注入速度快、施工时间短的缺点。在注水井吸水剖面反转的情况下，解堵剂难以进入低渗透部位发挥深部解堵作用。为提高解堵效果，本文采用物理模拟方法，对多层系组合模型的水驱、化学驱及解堵措施效果进行了实验研究和机理分析。结果表明，化学驱后常规解堵采收率仅提高0.70%，而“调剖+解堵”采收率提高“9.34%+2.59%”，产液量下降40%以上。可见，调剖与解堵联合作业具有封堵与疏通双重作用及协同效应，不仅扩大了波及体积，还减少了低效无效循环。在此基础上，采用数值模拟方法对目标井W4-2解堵方案进行了优化设计和效果预测。推荐方案：无机凝胶调剖剂用量13243.6立方米，由主剂（NaO·nSiO）、隔离液（水）和助剂（CaCl）经多轮交替注入油藏而成。解堵剂（KSO）注入量为100立方米，浓度为0.8%。实施后预计“产液量/注入量”比为3.7。
