Reverse circulation displacement of miscible fluids for primary cementing

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS Journal of Energy Resources Technology-transactions of The Asme Pub Date : 2023-02-06 DOI:10.1115/1.4056843
M. Ghorbani, Arsalan Royaei, H. J. Skadsem
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Abstract

Primary cementing is the well construction operation where drilling fluid is displaced from the annular space behind the casing string, and replaced by a cement slurry. The annular cement sheath is a critical barrier element that should provide zonal isolation along the well and prevent uncontrolled flow of formation fluids to the environment. We present a combined experimental and computational study of reverse circulation displacement of the annulus, corresponding to operations where cementing fluids are pumped down the annulus from the surface. We focus on iso-viscous displacements in a vertical and concentric annulus, and vary the density hierarchy among the fluids to study both stable and density-unstable displacement conditions. While the interface between the two fluids is advected according to the laminar annular velocity profile for density-stable and iso-dense displacements, considerable secondary flows and fluid mixing is observed for density-unstable cases. Increasing the imposed velocity from the top is seen to provide a certain stabilizing effect by suppressing backflow of the lighter fluid and reduce the magnitude of azimuthal fluctuations. Computational results are in qualitative agreement with the experiments, and support the categorization of the displacement flows as either inertial or diffusive, in accordance with previous work on buoyant pipe displacements.
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初次固井混相流体反循环驱替
一次固井是指将钻井液从套管柱后面的环形空间中排出,并用水泥浆代替的井施工作业。环形水泥环是一个关键的屏障元件,应沿井提供区域隔离,并防止地层流体不受控制地流向环境。我们提出了环空反循环位移的实验和计算相结合的研究,对应于从地面向环空泵送固井液的操作。我们关注垂直和同心环空中的等粘性位移,并改变流体之间的密度层次,以研究稳定和密度不稳定的位移条件。虽然对于密度稳定和等密度位移,两种流体之间的界面根据层流环形速度剖面是平的,但对于密度不稳定的情况,观察到相当大的二次流和流体混合。从顶部增加施加的速度可以看出,通过抑制较轻流体的回流并降低方位角波动的幅度来提供一定的稳定效果。计算结果与实验在质量上一致,并支持根据先前关于浮力管位移的工作将位移流分类为惯性或扩散。
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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