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Lost Circulation Assessment and Planning Program: Evolving Strategy to Control Severe Losses in Deepwater Projects

机译：失水循环评估和计划程序：控制深水项目严重损失的发展策略

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There was a time when simply dumping some mica or nuthulls down a wellbore was a standard procedure for stoppingmud losses. Certainly, these materials still work - for someapplications. But, many of today’s drilling operations bearlittle resemblance to that not-so-distant past. The industry isaccelerating its activities in deepwater and depleted zones,both of which present narrow operating limits, youngsedimentary formations, and high degree of depletionoverbalanced drilling. All of these now-common conditionsare ideal for fracturing and lost circulation.Drilling through and below salt formations presents a hostof technical challenges as well. The thief zone at the base ofthe salt can introduce severe lost circulation and well controlproblems, often resulting in loss of the interval or the entirewell. Controlling losses in this zone has proven to beextremely difficult. Very few lost circulation remedies havebeen successful, especially when using invert emulsiondrilling fluids. The lost time treating severe sub-salt losses canlast for several weeks, with obvious cost implications,especially for deepwater drilling operations.This paper reviews the methods applied to avoid lostcirculation in the sub-salt thief zone, as well as in thesubsequent intervals for a Gulf of Mexico deepwater projectand discusses the time and cost savings obtained. Formaximum success in these situations, emphasis has beenplaced on assessment and planning rather than individual lostcirculation products.The authors will detail the Lost Circulation Assessment andPlanning process that has been employed to explore andevaluate specific lost circulation problems and link them toexisting products, systems and services. The integrative preplanningprocess analyzes offset histories and formation datanot only to identify risk zones but also to gather informationon the exact fracture and pore size as well as fracture density. Afterward, detailed interval-specific decision-tree charts aredeveloped for stopping losses encountered while drilling ortripping in.In addition to discussing the application of this Assessmentand Planning process, the authors will outline the lessonslearned on the deepwater project, featuring pre-planning issuesgeared toward ensuring circulation is maintained throughoutthe wellbore.
机译：曾经有一段时间，简单地将一些云母或坚果壳倒入井眼是阻止泥浆流失的标准程序。当然，这些材料仍然适用于某些应用。但是，当今许多钻井作业与那段不太遥远的过去非常相似。该行业正在加速其在深水区和枯竭区的活动，这两个地区均具有狭窄的作业范围，沉积沉积物以及高耗竭的过度平衡钻井。所有这些现在很常见的条件都非常适合压裂和漏失循环。在盐层中及以下钻探也带来了许多技术挑战。盐底部的小偷带可能会导致严重的井漏和井控问题，通常会导致井间隔或整个井的损失。事实证明，控制该区域的损失极为困难。很少有丢失循环的补救措施获得成功，尤其是在使用反相乳化钻井液时。处理严重的盐下损失的时间浪费可能持续数周，尤其是对于深水钻井作业，这会产生明显的成本影响。本文综述了为避免盐下贼区域以及随后的间隔中的渗漏而采用的方法。墨西哥湾深水项目并讨论了节省的时间和成本。为了在这些情况下获得最大的成功，我们将重点放在评估和计划上，而不是单个的失流通量产品。作者将详细介绍失流通量评估和计划流程，该流程已用于探索和评估特定的失流通量问题，并将其与现有产品，系统和服务联系起来。整体的预计划过程分析偏移历史和地层数据，不仅可以识别危险区，而且可以收集有关确切裂缝，孔隙大小以及裂缝密度的信息。随后，开发了详细的特定于时间间隔的决策树图，以阻止钻探或绊进过程中遇到的损失。除了讨论此评估和计划过程的应用之外，作者还将概述在深水项目中获得的经验教训，并着重于为确保安全而进行的预先计划问题。在整个井眼中保持循环。

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