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Bottomhole Pressure Measurements: Indispensable Tool for Optimizing Underbalanced Drilling Operations

机译：井底压力测量：优化欠平衡钻井作业的必不可少的工具

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It has been forecast that by the end of the first decade of thisrnmillennium, offshore applications of underbalanced drillingrn(UBD) tools and technology will play a significant role in thernpetroleum industry, particularly in deep waters. Sincernimplementing the UBD technique in offshore operationsrnrequires serious efforts and very high expenses, knowledgerngained from UBD onshore operations must carefully bernstudied before being implemented into offshore applications.rnEven though the UBD technique has successfully beenrnused to minimize operational problems and to achieve drillingrnto the planned depth, without down time and on budget, thernpetroleum industry recognizes that the greatest advantage ofrndrilling underbalanced is to increase well productivity throughrnthe formation damage prevention during the drilling process.rnThe use of bottomhole pressure (BHP) sensors during UBD,rnrepresents one indispensable alternative to optimize the UBDrnprocess while simultaneously achieving both purposes, drillingrnto planned depth and avoiding formation damage.rnOperational process improvement, actual underbalancedrncondition, nitrogen injection optimization, actual pressurerndrop, reservoir pressure while drilling, and hydraulic modelrnevaluation represented some of the benefits obtained with thernBHP sensors during their very first application in MexicanrnUBD operations.rnThis work presents the recent results obtained by usingrnBHP memory tools during the ongoing Mexican UBDrnprogram. Also, it shows a systematic analysis of the potentialrnsavings in terms of cost and time factors that could bernobtained if the UBD technique were used to simultaneouslyrnachieve drilling to the designed depth and avoidingrnformation damage.
机译：据预测，到本世纪的第一个十年末，欠平衡钻井（UBD）工具和技术的海上应用将在石油工业，特别是深水领域中发挥重要作用。由于在海上作业中实施UBD技术需要付出大量的努力和非常高的费用，因此从UBD陆上作业中获得的知识必须先仔细研究，然后才能应用到海上应用中。即使已经成功地使用了UBD技术以最大程度地减少作业问题并实现钻探至计划的深度，在停机和预算有限的情况下，石油行业认识到钻探欠平衡的最大优势是在钻井过程中通过防止地层损坏来提高井的生产率。rn在UBD期间使用井底压力（BHP）传感器代表了优化UBD的一种必不可少的替代方案。同时实现这两个目的，钻至计划的深度并避免对地层造成损害。作业流程改进，实际欠平衡条件，氮气注入优化，实际压降，随钻油藏压力和水力劳尔模型的评估代表了rnBHP传感器在墨西哥rnUBD操作中首次应用时所获得的一些好处。这项工作展示了在进行中的墨西哥UBDrn程序中使用rnBHP存储工具获得的最新结果。同样，它显示了在成本和时间因素方面可能节省的成本的系统分析，如果使用UBD技术同时实现钻探至设计深度并避免变形破坏，则可以节省成本。

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