微乳液强抑制强封堵钻井液在SACHA区块的应用  

The Application of Strong-Inhibition Plugging Microemulsion Drilling Fluid in SACHA Block

作　　者：崔贵涛[1,2] 李宝军[1,2] 王兆政 

机构地区：[1]低渗透油气田勘探开发国家工程实验室(中国石油川庆钻探工程有限公司),陕西西安710018 [2]中国石油川庆钻探工程有限公司钻采工程技术研究院,陕西西安710018 [3]中国石油川庆钻探工程有限公司厄瓜多尔分公司,四川成都610051

出　　处：《石油钻探技术》2015年第6期20-23,共4页Petroleum Drilling Techniques

摘　　要：厄瓜多尔SACHA区块215.9mm井段在钻井过程中经常出现钻头泥包、井壁坍塌、起下钻遇阻、测井和下尾管阻卡等问题,在分析原因的基础上,选择有利于环保的有机抑制剂SUPHIB、半透膜剂MS和隔离膜剂EX等材料,优选出微乳液强抑制强封堵钻井液配方,并通过室内试验评价了其性能,结果表明:该钻井液在100℃条件下热滚16h后仍具有良好的基本性能;具有良好的抑制性能和封堵性能,对TENA层岩屑的回收率达到90%以上,膨胀率仅有1.32%,对高孔高渗储层岩心的封堵率达到99%。微乳液强抑制强封堵钻井液已经在厄瓜多尔SACHA区块的8口井进行了应用,均没有出现钻头泥包、起下钻遇阻、测井和下尾管阻卡等问题,且215.9mm井段平均井径扩大率降至10%以下。这表明,微乳液强抑制强封堵钻井液能够有效解决厄瓜多尔SACHA区块215.9mm井段的一系列井下复杂问题。During drilling in the SACHA Block of Ecuador,downhole troubles often occurred at215.9mm hole section,such as bit balling,hole collapse,tight points met in tripping,logging and liner running.In order to solve these problems,a strong-inhibition plugging microemulsion drilling fluid was developed by using environmentally friendly organic inhibitor SUPHIB,semi-permeable diaphragm MS and isolating membrane agent EX,its performance was evaluated by means of laboratory experiments.The research results showed that this system had good performance after being boiled at 100 ℃ for 16 h,with good inhibition and plugging effect,the recovery rate of TENA cutting reached over 90%,expansion ratio and plugging rate were 1.32%and 99%respectively for high-porosity high-permeability reservoir cores.It has been successfully applied to 8wells in SACHA Block,no bit balling,tripping sticking ro drag in logging and liner running occurred,and average hole enlargement rate at215.9mm hole section dropped to less than 10%.It is shown that the problems that occurred at215.9 mm hole section in the SACHA Block of Ecuador can be solved effectively by using strong-inhibition plugging microemulsion drilling fluids.

关 键 词：钻井液 微乳状液 抑制 封堵 SACHA区块 厄瓜多尔 

分 类 号：TE254[石油与天然气工程—油气井工程]