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庄海4×1井是港海一号平台施工的一口大井径、大斜度双靶预探井,完钻井深为2346 m,水平位移为503.59 m,最大井斜为41.9°,井斜角为2.99°。该井明化镇组、馆陶组地层粘土矿物以伊/蒙混层为主,亚甲基蓝容量高,膨胀性强,易坍塌掉块,油层易受污染。采用甲酸盐聚合醇钻井液体系。该体系主要由提粘剂CXV、降滤失剂CXF、井壁保护剂CXG、聚合醇、辅助抑制剂和甲酸盐等组成,基本无毒、可直接向海水排放。现场应用表明,甲酸盐聚合醇钻井液性能稳定,悬浮能力强,具有良好的润滑防卡性能、抑制性能和防塌性能,渗透率恢复值较高,对油层起到了一定的保护作用;该钻井液密度低、固相含量低、静切力小,利于井下安全和快速钻进,满足了庄海4×1井的定向施工要求。
Zhuanghai 4 × 1 well is a large bore and large-skew double-purpose pre-exploratory well constructed on the platform of Harbor No. 1 with a total drilling depth of 2346 m, a horizontal displacement of 503.59 m, a maximum deviation of 41.9 ° and a well inclination of 2.99 °. The well Minghuazhen Formation, Guantao Formation clay clay layer is dominated by Iraqi mixed layer, methylene blue with high capacity, strong expansibility, easy collapse collapse block, the reservoir vulnerable to pollution. Using formate polymerization alcohol drilling fluid system. The system mainly consists of CXV, CXF, CXG, polymeric alcohol, auxiliary inhibitor and formate, which are basically non-toxic and can be directly discharged into seawater. Field application shows that the performance of the formate polymerized alcohol drilling fluid is stable and its suspending ability is strong. It has good lubricity and anti-seize performance, inhibition performance and anti-collapse performance, and the permeability recovery value is relatively high, which plays a protective role in the oil layer. Low drilling fluid density, low solid content, low static force, which is conducive to safe and rapid drilling downhole, to meet the Zhuanghai 4 × 1 well directional construction requirements.