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首页> 外文会议>SPE/IADC Middle East Drilling Technology Conference and Exhibition >Case Study for Curing Circulation Losses during Primary Cementing Operations Using Fiber Cement in Zubair Field/Iraq
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Case Study for Curing Circulation Losses during Primary Cementing Operations Using Fiber Cement in Zubair Field/Iraq

机译：在Zubair Field / Iraq中使用纤维水泥治疗循环损失期间固化循环损失的案例研究

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The giant Iraqi Zubair oilfield is a hotspot for drilling activities. Many vertical and directional wells have been recently drilled in this oil field. Losing cement slurry into karstic facies of the Hartha formation is the main challenge on most wells. Achieving required top of cement behind the intermediate casing is a critical challenge because this casing is the main barrier against the corrosive sulfurous water of the underlying Um Er-Radhuma and Tayarat formations. In this field, in spite of the tremendous time and effort that have been spent to mitigate losses while drilling and before cementing, at least 55% of wells experience losses while cementing. Various conventional treatments have been implemented to bring cement to the surface in primary cementing operations, including one stage with lead and tail slurries and two stages with two cement slurries (lead and tail) for the second stage. Even when ample amount of extra excess of cement has been used for the second stage to compensate for the cement lost during first stage, there was still a need for top jobs subsequently after the cement job. Recently, the field applications of fiber cement have shown substantial success compared to the case of using only cement slurries as lost circulation material. This was confirmed by getting returns when displacing cement across the lost circulation zone (Hartha formation) in five out of six wells. The cement jobs of the six wells have been revised, and use of fiber cement has now become a standard practice for cementing the intermediate casing strings in this field. In addition to presenting six case studies in the use of fiber cement, this paper describes the previous efforts at solving the problem and the success criteria. This paper also discusses the mechanism and the properties of using fiber within cement slurries for curing lost circulation while cementing in fractured formations. Laboratory tests were conducted to evaluate the plugging efficiency and the magnitude of the developed compressive strength.
机译：巨型伊拉克Zubair油田是钻井活动的热点。最近在该油田中钻出了许多垂直和方向井。将水泥浆料失去到马斯蒂氏菌的角色面部是大多数井中的主要挑战。在中间壳体后面实现所需的水泥顶部是一个关键挑战，因为这种壳体是对潜在的UM ER-radhuma和Tayarat形成的腐蚀性硫水的主要屏障。在这一领域，尽管已经花费了减轻损失的巨大时间和努力，但在钻井之前和在巩固之前，但在胶结时至少有55％的井经验损失。已经实施了各种常规治疗以使水泥在初级固井操作中将水泥带入表面，包括具有铅和尾浆的一个阶段和两个阶段，第二阶段具有两个水泥浆料（引线和尾部）。即使在第一阶段使用的第二阶段额外超过过量的水泥量弥补了第一阶段失去的水泥，仍然需要在水泥工作之后随后获得最高工作。最近，与仅使用水泥浆料作为丢失的循环材料相比，纤维水泥的现场应用示出了实质的成功。当在六个井中的五个井中的丢失的循环区（Hartha Mablation）丢失水泥时，通过回报确认。已经修改了六个井的水泥作业，现在使用纤维水泥的使用现在成为巩固该领域中间壳体串的标准做法。除了在使用纤维水泥的使用中提出六种案例研究外，本文还介绍了解决问题的以往努力和成功标准。本文还讨论了使用纤维浆内使用纤维的机制和性质，以固化损失的循环，同时在裂缝形成中粘合。进行实验室测试以评估堵塞效率和显影抗压强度的幅度。

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