高密度油基钻井液流变性及沉降稳定性  

Sedimentation Stability of High Density Oil-based Drilling Fluids

作　　者：王金树[1] 周芳芳[1] 刘世恩[1] 张玉平[1] 

机构地区：[1]承德石油高等专科学校石油工程系,河北承德067000

出　　处：《承德石油高等专科学校学报》2017年第3期9-12,共4页Journal of Chengde Petroleum College

摘　　要：为了解决高密度油基钻井液存在流变性和沉降稳定性难以控制的技术难题,采用流变测试和VST沉降测试法分析了有机土、提切剂、润湿剂、降滤失剂、石灰石/重晶石级配等处理剂的加量对钻井液流变性和沉降稳定性的影响。结果表明,上述处理剂对高密度油基钻井液流变性和沉降稳定性均有影响,且存在最优加量。实验得出高密度油基钻井液优化配方(质量百分比)为:3.5%有机土+0.3%提切剂+0.3%主乳+2.5%润湿剂+1.0%氧化钙+2.5%降滤失剂+重晶石+石灰石(重晶石与石灰石等质量加入,石灰石为超细碳酸钙)。It is known that it is difficult to control the rheological property and sedimentation stability of high-density oil-based drilling fluid. In order to solve such technical problem, the effects of organ- ic bentonite, rheologieal control agent, wetting agent, filtrate reducer and limestone/barite grading on the rheology and sedimentation stability were analyzed by using the rheologieal and VST sedimentation tests. The results show that the treating agents mentioned above would all influence the rheological and sedimentation properties of the fluid and there is an optimum dosage. The optimized formula is 3,5wt% organic bentonite ＋ 0.3wt% rheological control agent ＋ 0.3wt% main emulsifier ＋ 2.5wt% wetting agent ＋ 1. 0wt% CaO ＋ 2.5wt% filtrate reducer ＋ limestone ＋ barite（The limestone and barite are equal in weight and the limestone is the superfine CaCO3）.

关 键 词：高密度 流变性 沉降稳定性 油基钻井液 

分 类 号：TE254[石油与天然气工程—油气井工程]