庄2井深部复杂地层钻井液技术

庄2井是准噶尔盆地中部1区块莫西庄油田的重点超深探井。该区块下部地层地质构造复杂,侏罗系砂泥互层且煤层发育致井壁失稳严重;三叠系发育超压,泥岩易发生硬脆性垮塌和应力性垮塌;井底温度高,高温下高密度钻井液流变性调控难度大。通过使用聚磺抗高温防塌钻井液体系,辅助钻井液现场维护和处理工艺,顺利钻至目的层。庄2井的钻探成功为该区块进一步勘探开发提供了详实的资料。

Drilling Fluid Technology about down Complex Formation in Zhuang 2 Well

Zhuang 2 well was an important ultradeep prospecting well, and it was located in Moxizhuang Area of middle Junggar Basin. The geological structure was complex. The wellbore wall was seriously instability because of sand and mudstone inerbeded and coal bed in Jurassic. Borehole collapse of hard and fragile shale occurred frequently because of ground stress. The temperature was high in downhole. The difficulty of regulation rheological property was great in conditions of high temperature and high density. After sulphonated polymer anti-temperature and anti-caving drilling fluid was applied, with the help of onsite drilling fluid technics, target stratum was drilled with safety and high efficiency. At last, the success of zhuang 2 well laid the foundation for further exploration and development the oilfield.