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牛东1井是中国石油集团公司2010年在冀中地区部署的一口重点风险探井,完钻井深为6 013 m,井底温度约为203℃。该井三开、四开井段含有大段泥岩和含膏泥岩,极易引起缩径、垮塌等复杂情况,对钻井液性能提出了极高要求。研发出了一套密度在1.20～2.0 g/cm3之间可调、抗温达200℃、抗盐膏污染能力强的“三高”钻井液。现场应用结果表明:在整个钻进过程中该钻井液性能稳定,抑制性强,返出钻屑棱角分明,高温高压滤失量小于10 mL;与邻井相比,虽然机械钻速降低25.33%,但施工周期却减少了2.39%,表明该钻井液满足了三开、四开井段的钻进要求,其优良的井壁稳定和井眼清洁能力,很大程度地减少了复杂事故的发生及其处理时间。
Well Niudong 1 is a key risk exploration well deployed by CNPC in Jizhong in 2010 with a drilling depth of 6 013 m and a bottom hole temperature of about 203 ° C. The well has three open and four open shaft sections containing large sections of mudstone and mudstone containing gypsum, which can easily lead to complicated situations such as shrinkage and collapse, and places extremely high demands on drilling fluid properties. Developed a density of 1.20 ~ 2.0 g / cm3 adjustable, anti-temperature up to 200 ℃, anti-salt paste pollution ability of the “three high” drilling fluid. The field application results show that the drilling fluid has stable performance and strong inhibition during the entire drilling process, and has the advantages of clear edge angle and high temperature and high pressure filtration loss of less than 10 mL. Compared with the adjacent wells, although the penetration rate is reduced by 25.33% , But the construction period was reduced by 2.39%, indicating that the drilling fluid meets the drilling requirements of the third and fourth well sections. Its excellent borehole stability and wellbore cleaning capability greatly reduced the occurrence of complex accidents And its processing time.