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Case Study of Managed Pressure Tripping Operation through Abnormal Formations in West Canadian Sedimentary Basin

机译：西加拿大沉积盆地异常形成管理压力绊倒操作的案例研究

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The deep basin of British Columbia, Canada contains the Montney and Doig plays, which are categorized as tight gas sands. Both are considered major unconventional gas plays containing vast quantities of gas in the west and oil in the coarser eastern facies. The formations have high initial formation pressure which promotes production, however during drilling causing drilling challenges. It is especially difficult when drilling through the abnormally pressured Doig transit zone. This is further complicated when a trip is required for the bit as the swabbing effect, if not properly managed, can easily escalade into a well control event. Due to the overpressured and geologically fractured formations, it is very difficult to trip the drill string out of the well safely without using specialized techniques. MPT is one such method that can be utilized in these scenarios. Managed Pressure Tripping allows the driller to control bottomhole pressure (BHP) in different types of abnormally pressured zones, and simultaneously eliminating the swabbing effects by holding surface back pressure (SBP) with the managed pressure drilling (MPD) system. Applying MPT techniques on subnormal and overpressured formations results in safe and cost effective drilling operations. This paper presents a case study where advanced Managed Pressure Tripping (MPT) technology was successfully applied in the Altares field in British Columbia, Canada, to mitigate well control challenges associated with swabbing. The study elaborates on recommended operational procedures, engineering calculations, equipment set up and process flow diagrams along with the analyzed graphical data.
机译：加拿大不列颠哥伦比亚省的深层盆地含有蒙特尼和DOIG剧本，被分类为狭长的天然气。两者都被认为是含有大量燃气在西部的大量气体的主要燃气剧，并在较粗糙的东方相连。该地层具有高初始形成压力，然而在钻井过程中促进了生产，导致钻井挑战。钻孔通过异常加压的DOIG传输区时特别困难。当比特作为擦拭效果所需的旅行时，这进一步复杂了，如果没有适当管理，可以轻松升级到井控制事件中。由于过度压抑和地质裂缝的地层，在不使用专业技术的情况下安全地将钻柱赶出钻柱。 MPT是可以在这些方案中使用的一种方法。施工压力跳闸允许钻机控制不同类型的异常压力区域的底孔压力（BHP），并同时通过将表面背压（SBP）与受管压力钻孔（MPD）系统保持在擦拭效果中。在亚型和过压地层上应用MPT技术导致安全且具有成本效益的钻探操作。本文提出了一个案例研究，其中先进的管理压力跳闸（MPT）技术在加拿大不列颠哥伦比亚省不列颠哥伦比亚省的祭坛领域成功应用，以减轻与刷柱相关的良好控制挑战。该研究详细阐述了建议的操作程序，工程计算，设备设置和处理流程图以及分析的图形数据。

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