多功能聚醚多元醇防塌剂SYP-1的性能评价及现场应用

新型多功能钻井液用防塌剂SYP-1是以低分子量醇为起始剂,由环氧乙烷(简称EO)和环氧丙烷(简称PO)共聚而成的聚醚型多元醇防塌剂,为白色或淡黄色粘稠液.室内试验对聚醚多元醇防塌剂SYP-1的性能进行了评价,结果表明,聚醚多元醇防塌剂SYP-1具有很强的抑制作用和良好的润滑性能,能显著降低钻井液摩擦系数,提高极压膜强度,对钻井液流变性影响小,能改善钻井液滤失性能,基本不发泡,保护油气层能力强;且无毒、易生物降解,满足环境保护要求;荧光级别小于3级,是一种适用于深井、定向井和水平井的高性能防塌剂.分析了多功能聚醚多元醇防塌剂SYP-1的作用机理,介绍了其现场应用情况.该防塌剂已在胜利油田、塔里木油田及吐哈油田推广应用,很好地解决了井壁坍塌和钻井液润滑性问题.

Performance evaluation on polyether polyatomic alcohol as multi-functional anti-sloughing agent SYP-1 and its field application

The polyether polyatomic alcohol as an anti-sloughing agent SYP-1 for drilling fluid is a copolymer made from epoxy ethane(EO) and propylene oxide(PO), taking a low molecule alcohol as the initiator. It is a viscous thick liquid appearing white or light yellow. Tests results reveal that SYP-1 provides strong inhibition, effectively decreases drilling fluid friction coefficient, increases extreme pressure film strength and has no obvious effect on rheological and frictional properties of drilling fluid. With no toxicity and easy to be biodegraded, it is environment friendly and can be used in deep wells, directional wells and horizontal wells. SYP-1 has been widely applied in several oilfields such as Shengli Oilfield and Tarim Oilfield. Problems of borehole failure and lubrication of the drilling fluid have been solved successfully.