LYM油田东一段强敏感性储层保护技术  

Protection of the Highly Sensitive Reservoir in the Dongyi Formation in Block LYM.

作　　者：李良川[1] 王在明[2] 徐小峰[2] 

机构地区：[1]中国石油大学石油天然气工程学院 [2]冀东油田钻采工艺研究院

出　　处：《钻井液与完井液》2009年第5期24-26,共3页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项"滩海油气田高效开发技术"(2008ZX0501 5-002)资助

摘　　要：LYM油田东一段储层属中孔中渗储层,敏感性矿物含量高,油层保护技术难度大。因此优选出了架桥暂堵剂XB-1和油溶性充填暂堵剂YB-2,将它们复配使用后在地层形成内封堵层(内泥饼),用CMJ-2成膜剂在地层形成外封堵层(外泥饼),在内外封堵层的共同作用下,使钻井液API滤失量降至2 mL,高温高压滤失量降至9mL;同时选用了0.35%KPAM、2%聚合醇和(3%～5%)KCl作为抑制剂,通过3种抑制剂的协同作用有效地抑制东一段储层黏土矿物的膨胀;用该钻井液污染后的岩心渗透率恢复值达到88%～100%。现场应用表明,该钻井液能有效地提高平均单井产量,使LYM油田东一段储层保护技术难题得到了较好的解决。The Dongyi Formation in Block LYM has a medium porosity and medium permeability,and high content of minerals sensitive to the disturbance from outside.To protect the reservoir,a temporary bridging agent XB-1 and an oil soluble temporary plugging agent YB-2 were developed.These two agents formed an interior cake in the reservoir formation,and a filming agent,CMJ-2 forms an outer cake on the borehole wall.The interior and the outer mud cakes reduce the API filter loss to 2 mL,and HTHP filter loss to 9 mL.By further treatment of the drill-in fluid with 3 inhibitors,0.35%KPAM,2%poly glycol, and 3%～5%KCl,swelling of the clay minerals in the reservoir is inhibited.Percent ratio of permeability recovery on a core contaminated with this drilling fluid was 88%～100%.Using this drill-in fluid,average single well production was increased in Block LYM.

关 键 词：防止地层损害 钻井完井液 临时性封堵 成膜 抑制性 

分 类 号：TE258[石油与天然气工程—油气井工程]