Successful Implementation of the PMCD Technology for Drilling and Completing the Well in Incompatible Conditions at Severo – Danilovskoe Oil & Gas Field

D. Krivolapov, I. Masalida, A. Polyarush, Vyacheslav Visloguzov, A. Averkin, Artem Rudykh, P. Ivanov
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Abstract

This paper discusses the successful implementation of PMCD (Pressurized Mud Cap Drilling) technology at Severo – Danilovskoe oil and gas field (SDO) located in the Irkutsk region. The abnormally high-pressure reservoir B1 and the abnormally low-pressure reservoir B5 are the target layers in this field. Wells drilling at SDO is accompanied with simultaneous mud losses and inflows conditions, especially if the strata B1 is being penetrated. Pumping lost circulation materials (LCM) and cement plugs do not solve lost circulation complications which subsequently lead to oil and gas inflows. As a result, most of such wells are getting abandoned. It was assumed that complications in this formation occurs due to the narrow safe pressures’ operating window (ECD window), therefore, the managed pressure drilling technology (MPD) was initially used as a solution to this problem. However, after the penetration of the abnormally high formation pressure B1 horizon with a pore pressure gradient of 1.86 g/cm3 it was found that there is no operating window. In this regard, there were simultaneous mud losses and oil and gas inflows during the circulation. The well was gradually replaced by oil and gas, regardless of the applied surface back pressure value in the MPD system. The mixing of the mud and reservoir fluid was accompanied by catastrophic contamination. As a result, the drilling mud became non - flowing plugging both the mud cleaning system and the gas separator. On the other hand, the plugging of the B1 formation with LCM did not bring any positive results. Bullheading the well followed by drilling with applied surface back pressure and partial mud losses gave only a temporary result and required a large amount of resources. An implementation of PMCD technology instead of MPD has been proposed as an alternative solution to the problem. This technology made it possible to drill the well to the designed depth (2904 - 3010 m interval). For tripping operations, as well as the subsequent running of the production liner it was necessary to develop an integrated plan for well killing and completion in extreme instability conditions. As a result of various killing techniques application, it became possible to achieve the stability of the well for 1 hour. Oil and gas inflows inevitably occurred when the 1 hour lasted. Based on these conditions, the tripping and well completion process was adapted, which in the end made it possible to successfully complete the well, run the liner and activate the hanger in the abnormally high-pressure reservoir.
PMCD技术在达尼洛夫斯科油田不兼容条件下钻完井的成功应用
本文讨论了位于伊尔库茨克地区Severo - Danilovskoe油气田(SDO)的PMCD(加压泥浆帽钻井)技术的成功实施。异常高压储层B1和异常低压储层B5是该区的目标层。在SDO钻井会同时出现泥浆流失和泥浆流入的情况,特别是在B1层被钻穿的情况下。泵入堵漏材料(LCM)和水泥塞并不能解决堵漏并发症,后者会导致油气流入。因此,大多数这样的井都被废弃了。人们认为,由于安全压力操作窗口(ECD窗口)狭窄,导致该地层出现并发症,因此,最初采用控压钻井技术(MPD)来解决这一问题。然而,在孔隙压力梯度为1.86 g/cm3的异常高地层压力B1层位穿透后,发现没有操作窗口。在这种情况下,循环过程中会同时发生泥浆流失和油气流入。不管MPD系统中施加的地面背压值如何,该井逐渐被油气取代。泥浆与储层流体的混合伴随着灾难性的污染。结果,钻井液成为泥浆清洗系统和气体分离器的不流动堵塞。另一方面,用LCM封堵B1地层没有取得任何积极效果。在施加地面背压和部分泥浆漏失的情况下,先对井进行压头处理,然后再进行钻井,这只能产生暂时的效果,而且需要大量的资源。采用PMCD技术代替MPD技术是解决该问题的另一种方法。该技术使井钻至设计深度(2904 - 3010米)成为可能。对于起下钻作业以及随后的生产尾管下入,有必要制定一个在极端不稳定条件下压井和完井的综合计划。由于应用了各种压井技术,因此可以实现1小时的井稳定性。当1小时持续时,石油和天然气不可避免地流入。基于这些条件,对起下钻和完井过程进行了调整,最终在异常高压油藏中成功完井、下入尾管并激活悬挂器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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