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Deepwater Reverse-Circulation Primary Cementing: Applicability and Technical Path Forward for Implementation

机译：深水逆循环一次固井：实施的适用性和技术路线

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A two-year government funded project is being conducted to evaluate the viability and applicability ofReverse-Circulation Primary Cementing (RCPC) in deepwater wells. This project focuses on the identificationof technical issues that must be addressed before routine RCPC operations can occur in deepwaterwells, and a recommended path forward to full evaluation of the viability of this placement technique indeepwater. Analysis includes numerical models and simulations, mechanical placement controls, cementingmaterials, and operational challenges.While RCPC has been used on land and on a few shallow water offshore wells, it has not yet been fullyevaluated for use in a challenging deepwater environment. The application of RCPC to deepwater wellsis expected to reduce bottom-hole circulating pressures and prevent lost circulation during cementing, aswell as increase safety, environmental sustainability, zonal isolation, and improve cement seals.Standard commercially available software packages are unable to directly model the flow path throughthe complex configuration of a deepwater reverse-circulation cementing process. A multi-physics finiteelementsoftware package has been used to develop a model to predict temperatures and pressures duringthe reverse-circulation cementing process. Evaluation of mechanical placement controls has found that amajor challenge will be the development of a switchable crossover between a conventional and reverseflow path, and the modification of float equipment. Also, with the application of RCPC it is anticipatedthat the design methodology of cementing fluids may be affected by changing the placement method.One major challenge in deepwater cementing is the narrow formation fracture gradient, so theapplication of RCPC has clear beneficial potential. By lowering the Equivalent Circulation Densities(ECDs) during the job, the risk of fracturing the formation and lost-circulation is decreased. Less fluid lostto the formation during placement can potentially lead to higher tops of cement (TOC) and improvedcement bonding and zonal isolation.
机译：政府正在进行为期两年的项目，以评估该项目的可行性和适用性。 深水井中的逆循环初级固井（RCPC）。该项目着重于识别 在深水中进行常规RCPC操作之前必须解决的技术问题 井，以及全面评估该放置技术可行性的推荐途径 深水。分析包括数值模型和仿真，机械放置控制，固井 材料和运营挑战。 尽管RCPC已在陆地和一些浅水海上井中使用，但尚未完全使用 经过评估，可用于具有挑战性的深水环境。 RCPC在深水井中的应用 有望降低井底循环压力并防止固井过程中的井漏，因为 以及增加安全性，环境可持续性，区域隔离并改善水泥密封性。 标准的市售软件包无法通过以下方式直接对流路进行建模 深水反向循环固井工艺的复杂配置。多物理场有限元 软件包已用于开发模型来预测温度和压力 反循环固井工艺。对机械放置控件的评估发现， 主要挑战将是在常规和反向之间开发一种可切换的分频器 流动路径，以及浮子设备的改造。此外，随着RCPC的应用，可以预见 改变注浆方法可能会影响固井液的设计方法。 深水固井的一个主要挑战是狭窄的地层裂缝梯度，因此 RCPC的应用具有明显的有利潜力。通过降低等效循环密度 （ECD）工作期间，降低了地层破裂和漏失的风险。减少液体流失 放置期间对地层的破坏可能会导致水泥顶（TOC）更高和改善 水泥粘结和区域隔离。

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