There are several problems in the high temperature resistant plugging agent used in steam flooding of heavy oil reservoirs to control steam channeling

such as low strength and poor long-term stability. So

it is urgent to develop a new type of high temperature resistant plugging agent to promote on-site application. In order to solve the technical problems caused by strong inter-layer heterogeneity of the heavy oil reservoirs in District 9-6 of Qigu Formation in Xinjiang Oilfield

including severe steam channeling and poor foam flooding effects

a plugging agent system suitable for high temperature reservoirs and composed of sulfonated tannin extract

cross-linking agent and accelerant has been developed. By the static evaluation experiment

it is found that the optimized formula of the plugging agent is as follows: 0.6 % sulfonated tannin extract + （2.0 % ~ 2.5 %） aldehyde cross-linking agent Ⅰ +（1.0 % ~ 2.0 %） phenol cross-linking agent Ⅱ +（0.05 % ~ 0.06 %） accelerant. The evaluation of reservoir adaptability shows that the strength of the plugging agent remains above level H after 30 days of aging at the reservoir temperature

and the plugging efficiency is above 94 %. It has laid a foundation for the field application of steam channeling control technologies in the heavy oil reservoirs of District 9-6 of Qigu Formation in Karamay Oilfield.