多组分交联聚合物凝胶性能与低渗透油藏优势通道的匹配关系

Matching Relationship between Performance of Multi-Component Crosslinked Polymer Gel and Predominant Channel of Low Permeability Reservoirs

曹淑君 赵凤兰 侯吉瑞 王凤刚 任 涛 孙靓靓 鲁渊

CAO Shu-Jun ZHAO Feng-Lan HOU Ji-Rui WANG Feng-Gang REN Tao SUN Liang-Liang LU Yuan

针对存在水驱优势通道的低温低渗透油藏的稳油控水问题，开展了多组分交联聚合物凝胶室内研究。从多组分交联聚合物凝胶的静态成胶性能、流变性、分流特性、封堵性能以及运移深度几个方面研究了其性能与非均质地层中优势通道的匹配关系。实验结果表明，在实验温度（40℃）下，多组分交联聚合物凝胶的初凝时间为3 h左右，完全成胶时间为24 h，成胶强度大于50000 mPa?s；成胶前呈现"剪切变稀"行为；对于渗透率级差大于10的非均质地层，选择封堵性较好；堵剂在注入量为0.3 PV的情况下，对渗透率为600×10-3、1000×10-3、10000×10-3μm2的优势通道的封堵能力较强，在渗透率10000×10-3μm2填砂管中的最终运移深度可达到总长度的3/5处，在1000×10-3和600×10-3μm2填砂管中的最终运移深度可达到2/5处。

To solve water control problem in low permeability and low temperature reservoirs with water flow predominant channels, a multi-component crosslinked polymer (MCCP) gel was studied in the lab. The matching relationship between the gel’s performance and predominant channels in heterogeneous formations was studied from the aspects of static performance, rheology, diversion adjustment ability, plugging property and migration depth. The experimental results showed that, at the temperature of 40℃, the initial gelation time was of about 3 h, the completely gelling time was of 24 h, and the gel strength was more than 50000 mPa?s. The shear thinned phenomenon occurred before gelation. The selective plugging property of the MCCP gel was good in heterogeneous formation whose permeability differential was less than 10. After injecting 0.3 PV MCCP solution, for the predominant channels with permeability of 600×10-3、1000×10-3、10000×10-3μm2, the gel had good plugging property. Its final migration depth in sand filling tube with permeability of 10000×10-3μm2 could reach 3/5 of the total length; for sand filling tubes with permeability of 1000×10-3 and 600×10-3μm2, the depths both could reach 2/5 of the total length.