摘要
针对常规冻胶堵剂溶解时间长、高温高盐油藏中稳定性差等问题,研制了一种由乳液聚合物、单体交联剂和稳定剂组成的适用于海上油田的耐温抗盐速溶冻胶堵剂。通过室内静态评价实验,优化了130℃下冻胶堵剂配方:2.0%~3.0%乳液聚合物+0.6%~1.2%交联剂+2.0%~3%稳定剂PE,该堵剂体系30℃下溶解时间20 min左右,成冻时间4~11 h可控,成冻强度级别D^F可调。实验结果表明,该冻胶堵剂在高温(130℃)高盐(矿化度33 351 mg/L,Ca2+、Mg2+离子含量达1 613 mg/L)条件下老化90 d后未脱水,显示出较好的耐温抗盐性能及抗剪切性能。典型冻胶堵剂配方的室内封堵和耐冲刷评价实验表明,优选出的冻胶配方封堵率达到96%以上,封堵效果较好,并且具良好的耐冲刷性能。
In view of the problems of long dissolution time, poor stability in high temperature and high salinity reservoir of con-ventional gel plugging agent, a heat resistant and salts tolerant instant gel plugging agent is developed composed of emulsion polymer, monomer crosslinker and stabilizer applicable to offshore oilifelds. Through lab static evaluation experiments, the formula of gel plug-ging agent at 130℃is optimized：2.0%-3.0%emulsion polymer＋0.6%-1.2%crosslinker＋2.0%-3%stabilizer PE. The dissolution time of the gel system is about 20 mins at 30℃, its gelling time can be controlled from 4-11 hours, and the gelling strength grade can be adjusted from D to F. The experimental results show that the gel system is not dehydrated after 90 days of aging time in the conditions of high temperature （130℃） and high salinity （33 351 mg/L salinity, and the Ca2＋＆amp;Mg2＋concentration being up to 1 613 mg/L）, show-ing favorable heat resistance, salt tolerance and shear resistance. The lab plugging and scouring resistance experiment of the typical gel plugging agent indicates that the plugging rate of the optimized gel formula is more than 96%, and the plugging effect of the gel is good, and the gel has good erosion resistance.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2014年第3期96-99,共4页
Oil Drilling & Production Technology
基金
国家自然科学基金"锆冻胶分散体的制备
表征及其在多孔介质中的运移规律的研究"(编号:51174221)
教育部新世纪优秀人才支持计划"冻胶分散体堵剂地层适应性及选择性堵水机理研究"(编号:20110226)
关键词
海上油田
冻胶堵剂
耐温抗盐
速溶
封堵性能
耐冲刷性能
offshore ifeld
plugging agent
heat resistant and salt tolerance
fast dissolution
plugging performance
scouring resistance performance
