生物酶破胶对PRF钻开液的油层保护效果研究  

Study on Reservoir Protection Effect of Enzyme Gel Breaker of PRF Spud-in Fluid

作　　者：许明标[1] 黄红玺[1] 王昌军[2] 张峰[3] 

机构地区：[1]长江大学石油工程学院,湖北荆州434023 [2]长江大学化学与环境工程学院,湖北荆州434023 [3]长江大学地球科学学院,湖北荆州434023

出　　处：《石油天然气学报》2009年第3期91-94,共4页Journal of Oil and Gas Technology

摘　　要：通过对水平井无固相钻开液采用生物酶进行完井破胶液化处理,发现单独使用生物酶破胶液并不能很好地改善钻开液的完井油层保护效果,替入隐形酸完井液段塞后,岩心渗透率恢复值仍然难以得到改善。在无固相钻开液中加入固相后,钻开液的岩心渗透率恢复值得到较大的提高。试验发现,在3%的碳酸钙酸溶性暂堵剂存在的情况下,钻开液生物破胶后的渗透率恢复值可以达到80%以上,基本满足油层保护的要求。By liquefying the completion fluid of solid-free spud-in fluid with enzyme, it was found out that the effect of formation protection could not be improved only using enzyme gel breaker alone. After solid particles were added into the spud-in fluid, the recovery value of core permeability was raised greatly. It is found out in the experiment that the recovery value is as high as 80% after enzymetic gel breaking when 3% of calcium carbonate acid soluable temporary plugging agent is added in, it can basically meet the requirements of formation protection.

关 键 词：生物酶 破胶 无固相钻井液 储层保护 

分 类 号：TE254.3[石油与天然气工程—油气井工程]