抗160℃超高密度柴油基钻井液体系  

An Ultra-high Density Diesel Oil Base Drilling Fluid for Use at 160 ℃

作　　者：尹达[1] 吴晓花[1] 刘锋报[1] 徐同台[2] 晏智航 赵续荣 YIN Da;WU Xiaohua;LIU Fengbao;XU Tongtai;YAN Zhihang;ZHAO Xurong(CNPC Tarim Oilfield Branch, Korla, Xinjiang 8410000;Beijing Shidahuyang Petroleum Scientec Development Company Limited, Beijing 102200)

机构地区：[1]塔里木油田分公司,新疆库尔勒841000 [2]北京石大胡杨石油科技发展有限公司,北京102200

出　　处：《钻井液与完井液》2019年第3期280-286,共7页Drilling Fluid & Completion Fluid

摘　　要：由于油气勘探开发逐步向深层、非常规等油气藏发展,要求采用抗高温超高密度油基钻井液钻进,该钻井液必须具有良好流变性、低的高温高压滤失量、良好的封堵性与动/静沉降稳定性。研讨了抗160℃超高密度柴油基钻井液配方。通过大量实验得出,采用重晶石加重,无法配制出具有良好流变性能与动沉降稳定性能的超高密度柴油基钻井液;形成了抗160℃密度为2.4~3.0g/cm^3超高密度柴油基钻井液配方为,0^#柴油与25%氯化钙盐水的质量比为90∶10,加入有机土+0.8%主乳化剂+1%辅乳化剂+1%润湿剂+5%降滤失剂+3%CaO+加重剂(重晶石∶MicroMax为6∶4),其中有机土加量随钻井液密度增加而下降,密度为2.4、2.6、2.8和3.0g/cm^3的柴油基钻井液,最佳有机土加量分别为1%、0.5%、0.3%、0。Increasing demands of oil worldwide is driving oil and gas exploration and development to deeper and unconventional petroleum reservoirs, and high temperature ultra-high density oil base drilling fluids are required to drill the wells. The high temperature ultra-high density oil base drilling fluids should have good rheology, low HTHP filtration rate, good plugging performance and good dynamic/static settling stability. An ultra-high density oil base drilling fluid used at 160 ℃ has been developed in laboratory. large amount of experiments show that, using barite, an ultra-high density diesel oil base mud with good rheology and good dynamic settling stability cannot be obtained. The composition of the ultra-high density diesel oil base drilling fluid, with its density changing from 2.4 g/cm^3 to 3.0 g/cm^3, is as follows: 0^# diesel oil and 25% CaCl2 water solution in a ratio of 90∶10 as the base fluid, organophilic clay, 0.8% primary emulsifier, 1% secondary emulsifier, 1% wetting agent, 5% filter loss reducer, 3% CaO and weighting agent (Barite∶Micromax =6∶4). The concentration of the organophilic clay decreases with density;density of 2.4 g/cm^3, 2.6 g/cm^3, 2.8 g/cm^3 and 3.0 g/cm^3 corresponds to the optimum organophilic clay concentration of 1%, 0.5%, 0.3% and 0%, respectively.

关 键 词：超高密度油基钻井液 抗高温 加重剂 有机土 微锰 

分 类 号：TE254[石油与天然气工程—油气井工程]