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All Lost-Circulation Materials and Systems Are Not Created Equal

机译:并非所有的漏失循环的物料和系统都相等

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Controlling circulation loss during well construction is morethan just selecting the proper type of lost circulation material(LCM).1 A fully engineered approach is recommended. Thisapproach incorporates a number of planning tools, including:? Borehole stability analysis? Hydraulics modeling to estimate equivalentcirculating density (ECD)? Drilling fluid and LCM material selection to helpminimize effects on ECD.Planning should include means to provide on-sitemonitoring using pressure while drilling (PWD), andconnection flow monitoring and timely application of LCMand treatments.The following practices are advocated to provide the bestavailable technology:? Base the amount of LCM on volume ratherthan weight.? Pretreat with LCM before drilling high risk lostcirculation zones.? Add subsequent treatments as sweeps, rather thanadding into the bulk drilling fluid system in thesuction pit.Results from a new laboratory study on LCM testing arediscussed and compared to more classic large scale laboratorydata from Drilling Engineering Association (DEA) jointindustry experiments conducted in the 1980s.2 Results arediscussed that demonstrate a rationale for pretreating drillingfluids with combinations of resilient graphitic carbon (RGC)and sized calcium carbonate (SCC) where a high probabilityfor loss of circulation exists.Simplified treatments using engineered combinations ofLCM in a single sack may be used for different applications,such as drilling depleted sands, seepage losses, and severe lostcirculation. In some cases a more specialized treatment maybe required, such as a two component system pumped down the drillpipe and annulus simultaneously, forming a flexibleseal in the fracture, and effectively isolating the boreholepressure from the fracture tip.
机译:在井建设过程中控制循环损失更多 不仅仅是选择正确类型的漏气材料 (LCM).1建议采用完全工程化的方法。这 该方法结合了许多计划工具,包括: ?钻孔稳定性分析 ?水力学模型估算等效值 循环密度(ECD) ?钻井液和LCM材料选择有助于 最小化对ECD的影响。 规划应包括现场提供的手段 使用随钻压力(PWD)进行监视,以及 连接流监控和LCM的及时应用 和治疗。 提倡以下做法以提供最佳 可用技术: ? LCM的数量基于体积而不是 比重量。 ?在钻探高风险之前进行LCM预处理 流通区。 ?添加后续处理作为扫描,而不是 添加到散装钻井液系统中 吸坑。 来自LCM测试的新实验室研究结果是 与比较经典的大型实验室进行了讨论和比较 钻井工程协会(DEA)联合提供的数据 1980年代进行的工业实验。2结果是 讨论表明了预处理钻孔的基本原理 弹性石墨碳(RGC)组合的液体 和中等大小的碳酸钙(SCC), 因为存在循环损失。 使用以下产品的工程组合简化治疗 单个麻袋中的LCM可以用于不同的应用, 例如钻探枯竭的沙子,渗漏损失和严重损失 循环。在某些情况下,更专业的治疗可能 是必需的,例如同时沿钻杆和环空泵送的两组分系统,形成了柔性的 密封裂缝,有效隔离井眼 来自骨折尖端的压力。

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