钻井液静切力对水平段固井顶替界面影响规律研究

发布时间：2019-02-13 06:11

【摘要】：水平封固段的固井顶替效果是水平井固井质量的关键问题,钻井液静切力是影响水平段固井顶替效果的重要参数。文章首先利用Gambit软件建立了300 m长水平段偏心环空数值模型,再利用Fluent软件基于国家超级计算中心天河一号计算平台,数值模拟隔离液顶替钻井液的过程。研究结果表明,在扶正器扶正条件和钻井液静切力调整允许时,尽量提高水平段套管居中度并降低钻井液静切力,可以达到理想的隔离液顶替效率与固井质量。当井眼条件差、扶正器下入困难时,降低钻井液静切力,可以大幅降低偏心环空窄边钻井液滞留,提高隔离液顶替效率和固井质量。当钻井液静切力较高不方便调整时,提高扶正器的扶正效果可以降低或抵消钻井液静切力对顶替的不利影响,提高隔离液顶替效率和固井质量。
[Abstract]:The cementing displacement effect of horizontal cementing section is the key problem of horizontal well cementing quality, and the drilling fluid static shear force is an important parameter affecting the horizontal cementing displacement effect. In this paper, the eccentric annulus numerical model of 300m long horizontal section is established by using Gambit software, and then the process of displacing drilling fluid by isolating fluid is numerically simulated by using Fluent software based on Tianhe-1 computing platform of National Supercomputing Center. The results show that when the centralizing condition of centralizer and the adjustment of drilling fluid static shear force are allowed, the casing centrality of horizontal section can be raised as far as possible and the static shear force of drilling fluid can be reduced, which can achieve the ideal displacement efficiency and cementing quality of drilling fluid. When the hole condition is poor and the centralizer is difficult to enter, reducing the static shear force of drilling fluid can greatly reduce the retention of the drilling fluid with narrow edge in eccentric annulus, and improve the displacement efficiency and cementing quality of the isolating fluid. When the static shear force of drilling fluid is higher than that of drilling fluid, the improvement of centralizer can reduce or counteract the adverse effect of static shear force of drilling fluid on displacement, improve the displacement efficiency and cementing quality of drilling fluid.
【作者单位】：中国石油大学石油工程学院·北京;中国石化石油工程技术研究院;
【分类号】：TE256

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