西藏伦坡拉盆地钻井液技术探讨

Discussion of Drilling Fluid Technology in Lunpola Basin,Tibat

根据西藏伦坡拉盆地地层特征和几口完钻井处理井塌、井漏、阻卡等复杂情况的经验，ＸＬ４井选用具有封堵防塌能力的钾聚屏蔽暂堵钻井液体系。结果表明，该体系及相关工程技术措施能满足钻井完井需要，有效地预防了伦坡拉盆地下第三纪牛２、３段井塌、井漏事故，保护了油气储层，经济效益显著。

According to the formation characters of Lunpola basin,Tibet,and the experience of several completed well in treating such drilling troubles as well slough,lost circulation and drillpipe sticking,XL4 well adopted the polypotassium shielding temperary plugging drilling fluid system,which had functions of blocking and slough resistance.It proved that this system and relative engineering technological measures could meet the requirements of well drilling and completion.It effectively prevented the occurance of well slough and lost circulation in Niu 2,3 intervals of Eogene in Lunpola basin.It protected the hydrocarbon reservoir and got remarkable economic benefit.