东海油气田超深大位移气井钻井关键技术

为了稳定东海油气田油气产量，在某断块部署了一口超深大位移井。针对大位移井高扭矩大摩阻、油基钻井液漏失、套管下入困难、电测固井质量手段受限等特点，设计阶段应用基于多目标优化的大位移井轨道设计方法优选了修正悬链线轨道类型，优化了井眼轨迹和井身结构设计，施工中采用摩阻扭矩随钻监测技术、ECD控制技术、旋转尾管挂技术等一系列大位移井钻井关键技术，确保了该井的顺利完成，完钻井深6 866 m，水平位移5 350.49 m，水垂比1.7，裸眼井段3 614 m、75°稳斜4 134 m。该井应用的系列钻井关键技术能满足超深大位移井钻井作业要求，具有广阔的推广应用前景。

Key drilling technologies for the ultradeep extended reach well in East China Sea Oil and Gas Field

In order to stabilize the oil and gas production of East China Sea Oil and Gas Field, one ultradeep extended reach well is deployed in one fault block. Extended reach wells are characterized by high torque, large friction resistance, oil-based drilling fluid leakage, difficult casing running and limited electric logging cement quality technology. To deal with these difficulties, the corrected catenary profile was selected by means of multiple objective optimization based extended reach well trajectory design method and hole trajectory and casing program were optimized in the design stage. And in the process of well drilling, a series of key drilling technologies for extended reach wells were adopted, including torque and drag monitoring while drilling, ECD control and rotary liner hanger, and consequently this well is drilled successfully with well depth of 6 866 m, horizontal displacement of 5 350.49 m, HD/VD of 1.7, open hole section of 3 614 m and 75° holding section of 4 134 m. It is indicated that the key drilling technologies applied in this well can satisfy the drilling requirements of ultradeep extended reach wells, and they are promising in popularization and application prospect.