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Development of Three-Layer Model and Numerical Simulation for Cuttings Transport in Horizontal Foam Drilling

机译：水平泡沫钻井中钻屑运移的三层模型开发与数值模拟

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Foam drilling has grown tremendously in the last few years. Foam is often used as a circulating fluid in underbalanced drilling operations (i.e. to keep the pressure of the drilling fluid less than the pressure of the formation fluid). Foam drilling has been shown to provide significant advantages, such as higher penetration rate, effective cuttings transport, less formation damage, etc. However, although, a few studies have been conducted on vertical wellbores, there is little detailed published information related to its use in horizontal wellbores. In this study, the cuttings behavior in horizontal foam drilling was numerically investigated. First of all, the experimental results of foam rheology and particle settling test were shown. Experimental results showed that the foam behaves like power law fluid and foam volumetric quality has a major impact on the settling phenomena. The next, a three layer model was developed to predict and interpret the cutting transport behavior in horizontal foam drilling. This model consists of a three-layer configuration, i.e. stationary bed of drilled cuttings at the bottom; a moving bed above it; and a heterogeneous suspension layer at the top. This model is based on conservation laws of mass and linear momentum as well as on constitutive relations that describe the interactions between each phase and the walls. The model was solved numerically to predict the cuttings bed height, pressure drop at different foam flow rates under several conditions. Furthermore, numerical simulations were carried out in order to investigate some factors affecting the cutting transport in horizontal foam drilling. The results of numerical simulation are presented.
机译：在过去的几年中，泡沫钻极大地发展了。泡沫通常在欠平衡的钻井作业中用作循环流体（即，保持钻井液的压力小于地层液的压力）。泡沫钻井已被证明具有显着的优势，例如更高的穿透率，有效的钻屑运输，更少的地层破坏等。但是，尽管已经对垂直井眼进行了一些研究，但很少有公开的有关其使用的详细信息。在水平井眼中。在这项研究中，数值研究了水平泡沫钻井中的岩屑行为。首先，给出了泡沫流变学和颗粒沉降试验的实验结果。实验结果表明，泡沫的行为类似于幂律流体，并且泡沫的体积质量对沉降现象有重大影响。接下来，开发了一个三层模型来预测和解释水平泡沫钻井中的切削运输行为。该模型由三层结构组成，即底部的钻屑固定床;上方的移动床;顶部是非均质的悬浮层该模型基于质量和线性动量的守恒定律以及描述每个相与墙之间相互作用的本构关系。对模型进行了数值求解，以预测几种条件下不同泡沫流速下的岩屑床高度，压降。此外，进行了数值模拟，以研究影响水平泡沫钻井中切削运输的一些因素。给出了数值模拟的结果。

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