摘要
由于次生应力场的作用以及盐岩易溶于水的特性,深部盐岩层钻进存在岩层蠕动、钻井液易遭受盐钙侵等问题;钻进参数选择不合理易导致盐岩层取心效率低、岩心冲蚀严重。本文以河南省叶舞凹陷ZK3井为例,采用石油钻井与绳索取心相结合的措施,解决了普通固体矿产钻探设备在深部地层取心中效力不足的问题;通过阳离子交换容量测定、矿物组分鉴定、钻井液体系优选及性能测试等试验,确定了针对上部泥岩地层的聚合物钻井液体系,中部含膏泥岩的欠饱和盐水钻井液体系,下部盐岩层取心段的饱和盐水钻井液体系。通过确定合适的钻井液密度与临界环空返速,可以有效控制深部盐岩层蠕变与井壁冲蚀,适度提高排量以成倍提高钻进速度。钻进过程中钻井液性能稳定,体系转换顺利且性能易于调整,为取心任务的顺利完成提供了有力保证。
With the function of the secondary stress field and the property of salt soluble in water,problems such as formation creeping,salt and calcium contamination often arise while drilling in deep salt beds. Unreasonable drilling parameters can result in low drilling efficiency and serious core washout. In this work,drilling equipment capacity deficiency is solved by combination of oil drilling and core drilling. With the CEC test,XRD test and different kinds of drilling fluid parameter tests,this work optimized the polymer drilling fluid system,unsaturated salt water drilling fluid system and saturated drilling fluid system for drilling in shale formations,salt- bearing strata and salt beds,respectively. Performances of the drilling fluids are stable,easy to transform and adjust. As a result,the borehole washing capability is improved by controlling critical annular velocity,and penetration rate is enhanced by increasing flow rates.
出处
《地质与勘探》
CAS
CSCD
北大核心
2015年第5期977-983,共7页
Geology and Exploration
基金
河南省国土资源厅地质矿产科技攻关项目<豫西复杂地层快速钻探技术研究>(编号:2011-622-11)资助
关键词
盐岩层
绳索取心
钻井液
井壁稳定
岩心冲蚀
临界返速
叶舞凹陷
河南
salt bed
core drilling
drilling fluid
borehole stability
core washing out
critical annular velocity
Yewu sag
Henan
