渤海P油田层内生成CO调驱技术

In-Situ COGeneration Technology in Bohai P Oilfield

郑玉飞 李翔 徐景亮 于萌

ZHENG Yufei LI Xiang XU Jingliang YU Meng

中海油田服务股份有限公司油田生产事业部，天津 300459

Oilfield Production Division, China Oilfield Services Limited, Tianjin, 300459, China

针对渤海P油田储层非均质性强、注水强度大，注入水突进和无效循环导致水驱开发效率低的问题，开展了层内生成CO2调驱技术研究。通过生气效率评价试验优选出最优生气体系，并利用Waring-Blender法和填砂管流动试验优选了配套发泡剂和稳定剂。室内试验结果表明：最优生气体系为生气剂A+释气剂D，其生气效率可达96.2%；发泡剂体系为0.2%发泡剂2+0.1%发泡剂5，其发泡体积为740 mL，析液半衰期为219 s；发泡体系中加入稳定剂1，对渗透率2 000～10 000 mD填砂模型的封堵率在90%以上。渤海P油田15个注采井组应用了层内生成CO2调驱技术，累计增注量69 986 m3，累计增油量33 413 m3，有效率达100%，有效期长达5个月。研究表明，层内生成CO2调驱技术技术对渤海P油田具有良好的适用性，解决了注水开发存在的问题。

In order to solve the problem of low water flooding development efficiency caused by strong reservoir heterogeneity, high water injection intensity, injected water influx and ineffective circulation in the Bohai P Oilfield, a study of in-situ CO2 generation technology was carried out. Firstly, the optimal gas generation system was selected by evaluating gas generation efficiency. Then, the foaming agent and blocking agent were screened by the Waring-Blender method and sandpack column flow experiment. Laboratory test results showed that gas generation efficiency could reach 96.2% when the gas system was blowing agent A + gas release agent D. The optimal foaming agent system was 0.2% foaming agent 2 + 0.1% foaming agent 5. The foaming volume was 740 mL and the half-life of dissolve-out liquid could be maintained for 219 seconds. When blocking agent 1 was added in the foaming system, the plugging rate could be maintained above 90% in the sandpack column with a permeability of 2 000-10 000 mD. The in-situ CO2 generation technology had been used in 15 injector producer pairs of the Bohai P Oilfield, resulting in the enhancement of accumulative oil recovery of 33 413 m3 by injecting 69 986 m3 of CO2 in total, with the effective rate reaching 100% and effective period up to 5 months, which indicated that in-situ CO2 generation technology had good applicability in Bohai P Oilfield and dissolves the problems existing in the water flood development of this field.

国家科技重大专项课题“渤海油田高效开发示范工程”（编号：2016ZX05058-003）、中海油服科技攻关项目“SZ36-1油田层内生成CO调驱关键技术优化研究及应用”（编号：YSB15YF002）和“N+1轮层内生成CO调驱效果优化研究与应用”（编号：YSB19YF019）部分研究内容

https://doi.org/10.11911/syztjs.2020015