新型抗高温高密度纳米基钻井液研究与评价  

Research on High Temperature and High Density of Nano-based Poly-glycol Drilling Fluid System

作　　者：姚如钢[1] 蒋官澄[1] 李威[1] 侯万武 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室 [2]中国石油长城钻探工程有限公司钻井液公司

出　　处：《钻井液与完井液》2013年第2期25-28,91,共4页Drilling Fluid & Completion Fluid

基　　金："十一五"国家科技重大专项(2011ZX05021-004);国家杰出青年科学基金项目(50925414)

摘　　要：针对高密度钻井液体系抗高温和低黏的需求以及纳米材料优异的物理化学特性,在高密度钻井液中引入了一种纳米材料HTSi-01。纳米材料HTSi-01是一种白色蓬松粉体改性纳米二氧化硅,其平均粒径在20 nm左右,比表面积大于600 m2/g,能在黏土颗粒和处理剂分子不饱和残键上形成牢固的物理化学吸附,从而显著改善钻井液润滑性,降低体系的黏度和切力,并能增强泥饼的致密性,降低体系的滤失量。通过一系列处理剂及其浓度优选和处理剂配伍性实验研究,得到了抗180℃高温、密度达2.36 g/cm3的新型纳米基钻井液体系。该钻井液体系具有优异的流变性及滤失造壁性能,抑制性良好,抗盐在29%以上,抗氯化钙达0.5%,48 h沉降稳定性良好,能悬浮和携带岩屑,并降低钻井液当量循环密度,满足高温高压深井钻进的需要。In view of the demands of high temperature and low viscosity,as well as nano-material with excellent physical and chemical performances,a material of nano-silica HTSi-01 that has the average particle diameter of 20 nm and surface to volume ratio of more than 600 m2/g is introduced into high density drilling fluid system,which can absorb to the surface of clay particles strongly,so as to improve lubricity and reduce viscosity,gel and filtration rate.Through laboratory experiments,a nano-based poly-glycol drilling fluid system is developed with temperature resistance of 180 ℃ and density of 2.36 g/cm3.The system has good performances of rheology,nitration and salt resistance that is over 29% of NaCl,0.5% of CaCl2,and the sedimentation stability is good within 48 h,which also can suspension and carrying cuttings effectively and reduce the drilling fluid the equivalent circulating density(ECD).

关 键 词：抗高温高密度钻井液 纳米二氧化硅 钻井液 当量循环密度 

分 类 号：TE254.3[石油与天然气工程—油气井工程]