Abstract: Water shutoff is the main measure to control water and stabilize oil in Tahe clastic reservoir. However, due to the influence of deep burial, high temperature and high salinity, it is difficult to improve water shutoff efficiency in horizontal wells. In view of this, based on the principle of interpenetrating network polymerization, a composite gel with organic crosslinking agent and silicate as the main body was synthesized. The results show that with the addition of a heat stabilizer, the gelling time of the plugging agent is controllable from 4 hours to 50 hours.The plugging agent does not dehydrate in 30 days at 130 ℃. The water phase plugging rate is over 90%, and it has excellent oil⁃water phase selectivity and formation permeability selectivity. It is necessary to use high⁃efficiency oil wash agent as pre⁃liquid and cross⁃linked polymer as sealing agent to control pressure and inject at low speed during construction. Good application results have been achieved in the field

Key words: Tahe Oilfield, Compound gel, Blocking agent, Performance evaluation, Field process

摘要： 堵水是塔河碎屑岩油藏控水稳油的主要措施，但是受埋藏深且高温、高盐的影响，水平井堵水提效困难。鉴于此，依据互穿网络聚合原理，合成以有机交联剂、硅酸盐为主体的复合冻胶堵剂，并进行了高温老化、油水驱替和毛细管注入实验。结果表明，在加入热稳定剂的情况下，该堵剂4～50 h成胶时间可控，130 ℃高温下30 d内不脱水，水相封堵率超过90%，而且具有优良的油水相态选择性和地层渗透率选择性。施工时需以高效洗油剂作为前置液、以交联聚合物作为封口剂控压低速注入，在现场取得了较好的应用效果

关键词: 塔河油田, 复合冻胶, 堵剂, 性能评价, 现场工艺