地下成胶堵水体系在海上油田的适应性及先导性试验

Adaptability Evaluation and Field Pilot Test of In-situ Gelation Water Shutoff System in Offshore Oilfield

姜 安 刘 星 李云鹏 山金城 王天慧 付校飞 吕国胜

JIANG An LIU Xing LI Yunpeng SHAN Jincheng WANGTianhui FU Xiaofei LYU Guosheng

为了控制海上油田油井过量产水，评价了地下成胶堵水体系（1%功能微球+3%功能单体+0.8%促胶剂）在 海上油田的注入性、封堵性、选择性、耐水冲刷性等性能，并进行了堵水先导性试验。研究表明，地下成胶堵水体 系从A级到I级强度的成胶时间长达134h，能满足现场施工对成胶时间的要求；体系具有良好的注入性，在渗透 率为1020×10-3μm2的填砂管中，注入压力仅为0.28MPa，且随渗透率的增加而降低；体系具有良好的选择性、封 堵性及耐水冲刷性，能优先进入高渗窜流区域，成胶后对高渗窜流区域的封堵率达90%以上，连续用水冲刷100 PV，封堵率仅下降约5.0%；体系成胶后具有良好的耐候性，在65℃下浸泡60d后强度损失率仅为4.1%。现场先 导性试验结果表明，地下成胶堵水体系堵水效果明显，能有效控制目标井复杂来水，实现目标井的“降水增油”。

In order to control excessive water production in oil wells in offshore oilfield，the properties including injectivity， plugging capability，selectivity and water flushing resistance of an in-situ gelation water shutoff system in offshore oilfield， composed of 1% functional microsphere +3% functional monomer +0.8% gel promoter，were evaluated，and a field pilot test was carried out. The property evaluation results showed that the gelation time of the in-situ gelation water shutoff system from strength A to strength I was as long as 134 h，which could meet the requirements of on-site implementation for gelation time. The injection pressure was only 0.28 MPa in the sandpack with a permeability of 1020×10-3μm2，and decreased with the increase of permeability， indicating the good injectivity of the system. The system had good properties of selectivity，plugging and water erosion resistance. It could preferentially enter the high permeability channeling area. After gelation，the plugging rate of the high permeability channeling area was more than 90%，and the plugging rate was only reduced by about 5.0% after 100 PV continuously water injection. After 60 days of immersing in water at the temperature of 65 ℃，the strength loss rate was only 4.1%，indicating that the system had good property of water immersion resistance after gelation. The field pilot test results showed that the water plugging effect of the in-situ gelation water shutoff system was obvious，the complex water channeling of the target well could be effectively controlled，and achieved the purpose of decreasing water production and increasing oil production of the target well.

10.19346/j.cnki.1000-4092.2023.04.014