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首页> 外文期刊>Journal of natural gas science and engineering >Wellbore instability induced by alternating water injection and well washing with an elasto-plastic erosion model
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Wellbore instability induced by alternating water injection and well washing with an elasto-plastic erosion model

机译：交替注水和采用弹塑性侵蚀模型的井冲洗导致的井筒失稳

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The well instability induced by well washing was investigated with finite element simulations. To describe this problem, a multi-physics coupling model, in which hydrodynamics, geomechanics and erosion were coupled through Young modulus, flow velocity and plastic yield, was established. We built a series of model to simulate this process. Results show that rock around wellbore and the cusp of perforation can be damaged in the process of well washing. This damage accelerates the erosion and the erosion induces further new damage. With the decrease of well washing pressure, the damage area increases. Some suggestions were given to prevent the wellbore instability such as injection with clean water, reinforcing the cement sheath and increasing well washing pressure. Our work could provide an insight in guiding the design of stable wellbore and well washing procedure. (C) 2015 Elsevier B.V. All rights reserved.
机译：用有限元模拟研究了由洗井引起的井不稳定性。为了描述这个问题，建立了一个多物理场耦合模型，该模型通过杨氏模量，流速和塑性屈服耦合了水动力，地质力学和侵蚀。我们构建了一系列模型来模拟此过程。结果表明，在洗井过程中，井眼周围的岩石和射孔的尖端会受到破坏。这种破坏会加速腐蚀，并且腐蚀会引起新的破坏。随着洗井压力的降低，破损面积增加。提出了一些防止井眼失稳的建议，例如注入清水，加固水泥护套和增加井洗压力。我们的工作可以为指导稳定井眼和洗井程序的设计提供参考。 （C）2015 Elsevier B.V.保留所有权利。

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