摘要
川西知新场地区泥页岩发育,特别是同一裸眼段,含有多层硬脆性泥页岩,极易发生井壁失稳,给钻井施工带来极大的影响。针对现用聚磺钻井液体系防塌封堵能力难以满足需要的实际情况,在深入研究井壁失稳机理的基础上,通过正交实验,研究形成一套以聚磺钻井液为基础的稀硅酸盐防塌钻井液技术。经过性能评价,稀硅酸盐钻井液克服了以往流变性难控制的难题,可控密度为1.40～2.20 g/cm3,并具有较强的防塌封堵能力。研究成果在ZX31井进行了现场应用,实钻三开井径扩大率远低于邻井,表明稀硅酸盐钻井液具有较好的防塌封堵能力,解决了川西知新场地区井壁失稳问题,为知新场-石泉场构造带的勘探开发积累了经验。
Shale-related borehole instability is encountered in drilling operation in Chuanxi block, many layers of hard-friable shale are found in one open hole section.The mechanism of deep formation caving in Chuanxi block is studied and a dilute silicate anti-caving drilling fluid system is developed to replace the polysulfonate drilling fluid.The experimental results show that the density of that covers from 1.40 g/cm3 to 2.20 g/cm3.The application of this drilling fluid system in well ZX31 shows that the borehole enlargement rate is 6.43% in the third interval.
出处
《钻井液与完井液》
CAS
北大核心
2012年第2期32-34,91-92,共3页
Drilling Fluid & Completion Fluid
基金
中石化西南油气分公司科研项目<提高钻井速度的钻井液防塌技术研究>(GJ-141-0991)部分研究内容
关键词
钻井液
硅酸盐
防塌
井壁稳定
川西地区
Drilling fluid
Dilute silicate drilling fluid
Anti-caving
Borehole stability
Chuanxi block
