一种新型二次交联凝胶体系的合成与应用  

Synthesis and Application of a New Type of Secondary Crosslinking Gel System

作　　者：梁守成[1] 吕鑫[1] 陈冠中[1] 李强[1] 李丽霞[1] 

机构地区：[1]海洋石油高效开发国家重点实验室,中海油研究总院,北京100028

出　　处：《科学技术与工程》2017年第4期189-193,202,共6页Science Technology and Engineering

基　　金：中海石油(中国)有限公司综合科研项目(YXKY-2016-ZY-02)资助

摘　　要：针对海上油田多轮次调剖后,调剖效果逐渐变差的问题,研制了一种成胶时间及强度可控的二次交联凝胶体系。通过改变交联剂合成过程中冰醋酸与已二酸的摩尔比,调控凝胶体系不同阶段的成胶时间与成胶强度,扩大凝胶体系注入过程中的波及范围,改善多轮次调剖后的调剖效果;并对所合成二次交联凝胶体系在渤海S油田条件下的性能进行评价,获得适合现场应用的体系配方。研究表明,二次交联凝胶体系浓度选用4 000 mg/L聚合物+3 000 mg/L交联剂,冰醋酸与已二酸摩尔比为1∶3时,分级交联凝胶体系与渤海S油田高渗条带具有最佳的匹配效果,体系兼具封堵性能与运移性能。平板模型驱油实验表明,调剖前后水驱采收率提高16.05%。研究结果应用于渤海S油田,2口井累计增油18 288方,平均含水降低8.4%,矿场试验效果良好。According to the effect of profile control gradually become poor after multi-round profile control in offshore oilfield, a secondary crosslinking gel system was developed which gel time and strength were controllable. By changing the molar ratio of acetic acid to adipic acid, the gel time and gel strength can be control at different stages. Through enhancing the initial strength of the profile control system, sweep volume in the process of gel in-jection was expand, and improved profile control effect after multi-round profile control. Performance of the second-ary crosslinking gel system was evaluated in Bohai S Oilfield condition, and the formula was selected. Studies have shown that secondary crosslinking gel system has the best matching performance with high permeability belt when the system concentration is 3 000 mg/L polymer and 4 000 mg/L crosslinking agent, and molar ratio of acetic acid to adipic acid is 1＊3. Displacement experiment with flat plate model show that water flooding recovery was en-hanced 16. 05% after injecting profile control system. The results are applied to the S oilfield which lead to a de-crease of 8. 4% in water cut and a increase of 18 288 m3 of oil production.

关 键 词：二次交联 体系合成 性能评价 封堵效果 多轮次调剖 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]