As the development of well types for low permeability reservoirs shifts from vertical to highly inclined/horizontal wells, targeted studies of oil and gas reservoir damage must be conducted for such well types to improve the science and effectiveness of acidification conversion. Taking into account the formation of mud cake and the dynamic damage factors caused by drilling fluid on the reservoir during horizontal well drilling, a refined dynamic description model for nonuniform damage in horizontal wells was established. The coupled simulation accounts for the dynamical destruction of the skin factor of the reservoir and the dynamical generation of the slurry. The coupled model consists of a radial mud cake dynamic formation model, a reservoir damage radius model, a permeability distribution model, and a horizontal well inhomogeneous skin factor model. It captures the dynamic evolution of reservoir damage due to drilling fluid contamination during horizontal well drilling and provides a real‐time representation of changes in the reservoir skin factor of horizontal wells, measuring the depth and extent of radial reservoir damage. Clarifying the extent of reservoir damage and its impact in horizontal well sections can help select appropriate acidification methods, improve acid distribution processes, and ultimately improve the effectiveness of mitigating reservoir damage and increasing oil and gas well productivity.

中文翻译：

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非均质碳酸盐岩油藏水平井储层动态伤害及影响因素模拟

随着低渗透油藏井型开发由直井向大斜/水平井转变，必须针对此类井型开展油气藏损害研究，提高酸化改造的科学性和有效性。考虑水平井钻井过程中泥饼的形成以及钻井液对储层造成的动态伤害因素，建立了水平井非均匀伤害精细化动态描述模型。耦合模拟考虑了储层表皮因子的动态破坏和泥浆的动态生成。耦合模型由径向泥饼动态地层模型、储层损伤半径模型、渗透率分布模型和水平井非均质表皮因子模型组成。它捕捉水平井钻井过程中钻井液污染造成的储层损害的动态演化，实时表征水平井储层表皮系数的变化，测量径向储层损害的深度和程度。明确水平井段储层损害程度及其影响，有助于选择合适的酸化方法，改善配酸工艺，最终提高减轻储层损害、提高油气井产能的效果。