冀东油田人工端岛大位移井钻井完井技术

Drilling and Completion Technologies of Extended-Reach Wells in the Artificial Island of the Jidong Oilfield

为解决冀东油田人工端岛大位移井摩阻扭矩大、携岩困难,馆陶组玄武岩、东营组东二段泥岩和沙河街组泥岩易垮塌,裂缝及断层易漏、深层井段定向托压、套管下入困难等问题,开展了人工端岛大位移井钻井完井技术研究。利用Landmark软件对井眼轨迹、钻井参数、井眼清洁、摩阻、扭矩、钻具和套管下入安全性等进行了分析,研究了钻井液排量、钻井液流变性、岩屑床破坏器安装位置与岩屑床的关系,以及KCl成膜封堵钻井液配合新型润滑、防塌、封堵剂解决定向托压、井漏、井塌问题及降摩减扭接箍的安装位置和安装方法,形成了装备配套、软件预测和优化、润滑防塌封堵钻井液体、井眼清洁、减摩减扭、岩屑床破坏、套管安全下入等技术。冀东油田人工端岛4口水平位移超4 000.00m的大位移井的钻井完井情况表明,钻井完井周期明显缩短,井下故障得到了有效控制,完钻井最深6 387.00m,水平位移达4 940.99m。研究认为,冀东油田人工端岛大位移井钻井完井技术实现了该油田人工端岛油区的安全高效开发,具有较好的推广应用价值。

Extended-reach well drilling has numerous problems in the artificial island of the Jidong Oilfield,They include,high levels of friction torque,poor sand transport,frequent wellbore collapse in the basalt section of Guantao formation and the mudstone section of Shahejie formation,circulation lost through fractures and faults,back pressure in directional drilling of deep section,and difficulty in safely completing RIH casing safely.To determine solutions for the problems,a study of drilling/completion technologies of extended-reach wells in the artificial island of Jidong Oilfield was carried out.Landmark software was used to analyze wellbore trajectory,drilling parameters,wellbore cleaning,friction drag,torque,drilling tools,and casing RIH safety data.Drilling fluid flowrate,drilling fluid rheology,and the relationship between the installation position of cuttings bed breaker and the cuttings bed were investigated.In addition,the solutions to back pressure in directional drilling,lost circulation and wellbore collapse by integrated application of KCl film-blocking drilling fluid together with new lubrication,anti-collapse,plugging agents,as well as the installation position and method of friction/torque reducing coupling were studied.Through those studies and investigations,problems have been solved,and new technologies have been developed for equipment matching,software prediction and optimization,lubrication and anti-collapse sealing drilling fluid,wellbore cleaning,friction and torsion reduction,cuttings bed damage,and casing RIH safety.The drilling and completion performance in 15 extended-reach wells in the artificial island of Jidong Oilfield showed that the drilling/completion period is significantly reduced,and the downhole problems and complex conditions are effectively controlled.The maximum well depth is up to 6 387.00 m and the horizontal displacement reaches 4 940.99 m.The results demonstrated that the application of drilling and completion technologies of extended-reach wells in the artificial island of Jidong Oilfield have been supporting safe and efficient development of the oil reservoir accessed through the artificial.These technologies would have good prospects for application in other situations in the near future.