Successful Implementation of Managed Pressure Drilling and Managed Pressure Cementing Techniques in Fractured Carbonate Formation Prone to Total Lost Circulation in Far North Region

Zhanna Kazakbayeva, Almas Kaidarov, A. Magda, Fuad B. Aliyev, Harshad Patil, E. Dietrich, I. Cook
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引用次数: 1

Abstract

Drilling reservoir section in the oilfield located in Far North region is challenged with high risks of mud losses ranging from relatively minor losses to severe lost circulation. Numerous attempts to cure losses with traditional methods have been inefficient and unsuccessful. This paper describes implementation of Managed Pressure Drilling (MPD) and Managed Pressure Cementing (MPC) techniques to drill 6-1/8″ hole section, run and cement 5″ liner managing bottomhole pressure and overcoming wellbore construction challenges. Application of MPD technique enabled drilling 6-1/8″ hole section with statically underbalanced mud holding constant bottom hole pressure both in static and dynamic conditions. The drilling window uncertainty made it difficult to plan for the correct mud weight (MW) to drill the section. The MW and MPD design were chosen after risk assessment and based on the decisions from drilling operator. Coriolis flowmeter proved to be essential in deciphering minor losses and allowed quick response to changing conditions. Upon reaching target depth, the well was displaced to heavier mud in MPD mode prior to open hole logging and MPC. MPD techniques allowed the client to drill thru fractured formation without losses or gains in just a couple of days as compared to the months of drilling time the wells usually took to mitigate wellbore problems, such as total losses, kicks, differential sticking, etc. This job helped the client to save time and reduce well construction costs while optimizing drilling performance. Conventional cementing was not feasible in previous wells because of risks of losses, which were eliminated with MPC technique: bottomhole pressure (BHP) was kept below expected loss zones that provided necessary height of cement and a good barrier required to complete and produce the well. Successful zonal isolation applying MPC technique was confirmed by cement bond log and casing integrity test. Throughout the project, real-time data transmission was available to the client and engineering support team in town. This provided pro-active monitoring and real-time process optimization in response to wellbore changes. MPD techniques helped the client to drill the well in record time with the lowest possible mud weight consequently reducing mud requirements. The MPD system allowed obtaining pertinent reservoir data, such as pore pressure and fracture pressure gradients in uncertain geological conditions.
在远北地区易漏失的碳酸盐岩裂缝性地层中成功实施控压钻井和控压固井技术
在远北地区的油田,钻井油藏段面临着泥浆漏失风险高的挑战,从相对较小的泥浆漏失到严重的泥浆漏失。许多尝试用传统方法来弥补损失的尝试都是低效和不成功的。本文介绍了控压钻井(MPD)和控压固井(MPC)技术的实施,以钻6-1/8″井段,下入和固井5″尾管,控制井底压力,克服井筒施工挑战。MPD技术的应用使6-1/8″井段在静态和动态条件下都能保持恒定的井底压力。钻井窗口的不确定性使得难以规划钻井段的正确泥浆比重(MW)。MW和MPD的设计是在风险评估后根据钻井公司的决定进行的。科里奥利流量计被证明是必不可少的破译小损失,并允许快速响应不断变化的条件。在达到目标深度后,在裸眼测井和MPC之前,采用MPD模式将井置换到更重的泥浆中。MPD技术使客户能够在短短几天内钻过裂缝地层,而不需要几个月的钻井时间来缓解井眼问题,如总漏失、井涌、压差卡钻等。这项工作帮助客户节省了时间,降低了建井成本,同时优化了钻井性能。由于存在漏失风险,常规固井在以前的井中是不可用的,而MPC技术消除了这一风险:井底压力(BHP)保持在预期的漏失区域以下,提供了必要的水泥高度和完井和生产所需的良好屏障。通过水泥胶结测井和套管完整性测试,证实了MPC技术层间隔离的成功。在整个项目中,实时数据传输可以提供给客户和城市的工程支持团队。这为响应井眼变化提供了主动监测和实时工艺优化。MPD技术帮助客户在创纪录的时间内以尽可能低的泥浆密度钻井,从而降低了泥浆需求。MPD系统可以在不确定的地质条件下获得相关的储层数据,例如孔隙压力和破裂压力梯度。
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