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首页> 外文期刊>Journal of natural gas science and engineering >Effects of fluid seepage on wellbore stability of horizontal wells drilled underbalanced
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Effects of fluid seepage on wellbore stability of horizontal wells drilled underbalanced

机译：渗流对欠平衡水平井水平井井眼稳定性的影响

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The combination of underbalanced drilling (UBD) and horizontal wells produces high efficiency. However, UBD in horizontal wells is also risky a lack of effective support from drilling fluid may lead to wellbore instability; formation fluid that flows from formation to the wellbore applies additional stresses to rocks around the wellbore; the existing stresses from fluid seepage which are usually ignored increase the chances of wellbore collapse. So the aim of this study is to analyze the effects of fluid seepage on wellbore rocks. Based on seepage mechanics and linear elastic theory, a new analytical model that takes fluid seepage into consideration is introduced to examine wellbore circumferential stresses, and then a new wellbore collapse pressure model is derived. When fluid seepage is taken into account, collapse pressure calculated by the new model is higher and more accurate than that calculated by the conventional model, which means that we will have a narrower mud-density window during UBD process.
机译：欠平衡钻探（UBD）和水平井的结合可提高效率。但是，水平井的UBD也存在风险，因为缺乏钻井液的有效支撑可能会导致井眼不稳定。从地层流到井眼的地层流体对井眼周围的岩石施加了额外的应力。现有的流体渗漏应力通常被忽略，这增加了井眼坍塌的机会。因此，本研究的目的是分析渗流对井眼岩石的影响。基于渗流力学和线性弹性理论，提出了一种考虑流体渗流的新解析模型，以研究井眼周向应力，进而推导了新的井眼坍塌压力模型。考虑到流体渗流，新模型计算的塌陷压力比常规模型计算的崩溃压力更高且更准确，这意味着在UBD过程中，我们将具有更窄的泥浆密度窗口。

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