KCl聚合物钻井液防水锁性能优化研究

Anti-Water Lock Optimization of KCl Polymer Drilling Fluid

蒋官澄 张志行 张弘

Jiang Guancheng Zhang Zhihang Zhang Hong

石油工程教育部重点实验室(中国石油大学(北京)), 北京 102249; 油气资源与探测国家重点实验室(中国石油大学(北京)), 北京 102249

MOE Key Laboratory of Petroleum Engineering(China University of Petroleum (Beijing)), Beijing, 102249, China; State Key Laboratory of Petroleum Resources and Prospecting(China University of Petroleum (Beijing)), Beijing, 102249, China

为了能够在低孔低渗储层中应用KCl聚合物钻井液进行钻井,研究了其防水锁性能。在探讨水锁损害机理的基础上,提出了防水锁损害的技术对策,通过向KCl聚合物钻井液中加入防水锁剂FCS和油膜暂堵剂GPJ,提高该钻井液的防水锁性能,并对其防水锁效果进行了评价。岩心自吸试验表明,岩心的钻井液滤液饱和度由76.24%降至35.41%,钻井液的防水锁性能大大提高。钻井液体系优化后,钻井液滤液对岩心的侵入量和深度都明显降低,返排能力增强,岩心动态污染渗透率恢复率达到90%以上。研究表明,该提高钻井液防水锁性能的方法可行,拓宽了KCl聚合物钻井液在低孔低渗储层中的应用。

In order to apply KCl polymer drilling fluid system to low porosity-low permeability reservoirs better,its anti-water lock performance was studied. Based on the research of water locking damage mechanism and anti-water lock technical countermeasures,such as adding anti-water lock agent FCS and oil-film temporary plugging agent GPJ to optimize KCl polymer drilling fluid system,were put forward,and their anti-water lock effects were evaluated. Core spontaneous imbibition test showed drilling fluid filtrate saturation decreased from 76.24% to 35.41%,suggesting great improvement in the anti-water lock performance of the drilling fluid. At the same time,the depth and amount of drilling fluid filtrate reduced significantly;flowback capacity increased greatly;the permeability recovery rate tested by the core dynamic pollution reached over 90% after the optimization of the drilling fluid. The method to improve the anti-water lock performance of drilling fluid was practical,which extended the application scope of KCl polymer drilling fluid system to low porosity-low permeability reservoirs.

国家高技术研究发展计划("863"计划)项目"致密砂岩气藏"提速、提效"型钻井液新技术研究与应用"(编号:2013AA064803)部分研究内容;国家科技重大专项"复杂结构井优化设计与控制关键"(编号:2011ZX05009-005-03A)资助。

https://doi.org/10.3969/j.issn.1001-0890.2013.04.013