分层调驱中管柱的剪切作用对可动凝胶性能的影响

Effect of Shear Action on Movable Gel Flooding in Stratified Columns

罗斯力 王航臣 王志强 王东升 董毅 王少波 高珊珊

LUO Sili WANG Hangchen WANG Zhiqiang WANGDongsheng DONG Yi WANG Shaobo GAO Shanshan

针对华北油田留62断块储层埋藏深、温度高的特点，优选出了耐温性能较好的可动凝胶配方体系：1500 mg/L聚丙烯酰胺+ 2000mg/L树脂交联剂+ 1000mg/L乌洛托品复合促交剂+ 50mg/L多苯多胺热稳定剂。结合分 层调驱工艺，在实验室模拟实验了偏心配水器和堵塞器剪切对可动凝胶溶液交联性能的影响。结果表明，可动 凝胶经过偏心配水器后，凝胶溶液黏度保持率为97.76% ，交联后凝胶黏度保持率为98.64% ，偏心配水器剪切对 可动凝胶性能影响较小；堵塞器剪切对可动凝胶性能影响较大，堵塞器开启程度越小，可动凝胶通过时产生的节 流压差越大，对可动凝胶的剪切越严重，甚至影响可动凝胶的交联。在利用分注管柱实施可动凝胶调驱时，建议 捞出调驱目的层的堵塞器。在留62-72井进行现场试验，可动凝胶调驱后不影响分注的投捞调配，调驱效果较 好。图2 表4 参13

According to the characteristics that the reservoir bed of Liu 62block in Huabei oilfield was deeply buried at high temperature ，the formula of movable gel system with good temperature performance was optimized ，which consisted of 1500mg/L polyacrylamide，2000 mg/L resinous cross-linking agent，1000 mg/L hexamine cross-promoting agent and50 mg/L thermal stabilizing agent. Combined with the hierarchical flooding process ，the shear effect of eccentric water distributor and blanking plug on the crosslinking performance of movable gel solution was studied through model experiment in laboratory. The results showed that the viscosity-retention rate of gel solution was 97.76% after passing through the eccentric water distributor，and that was 98.64% after cross-linking. The eccentric water distributor shear had little effect on the properties of movable gel. But the blanking plug shear had great influence on the performance of movable gel. The smaller opening degree of plug device，the bigger throttle pressure difference was while the movable gel passed，the more serious shear on the movable gel was ，which even affected the crosslinking of movable gel. Therefore ，in the use of tubing string of movable gel flooding ，it was suggested to fish up the blanking plugs in control-drive objective layers. The field trials in Liu 62-72wells revealed that the movable gel after control-driving had no influence on the tripping and allocation in separate injection and the control-driving effect was preferable.