存在岩屑床的水平环空钻井液紊流CFD模拟

发布时间：2018-01-09 10:14

本文关键词：存在岩屑床的水平环空钻井液紊流CFD模拟　出处：《断块油气田》2017年01期 　论文类型：期刊论文

【摘要】：在钻井过程中,由于钻井液携岩效率的限制,在水平井段极易形成岩屑床。利用CFD(计算流体动力学)软件来模拟环空成床后的钻井液紊流流动规律,模拟结果与已发表的实验数据对比,验证了所选模型的正确性。环空岩屑床的存在将减小流核区的速度,但会增加岩屑床面附近的速度,有助于床面岩屑起动;增加岩屑床高度,环空摩擦压降会减小;随着岩屑床壁面粗糙度增加或岩屑床高度减小,钻井液流动时作用在床面上的切应力减小,不利于床面岩屑的起动;且在钻柱与床面交汇处容易形成屏蔽效应。
[Abstract]:Due to the limitation of drilling fluid carrying efficiency, cuttings bed is easily formed in horizontal well section during drilling. The turbulent flow law of drilling fluid is simulated by using CFDs (computational fluid dynamics) software. The simulation results are compared with the published experimental data to verify the correctness of the selected model. The existence of annulus cuttings bed will reduce the velocity of the flow core area, but will increase the velocity near the cuttings bed surface, which will be helpful to the cuttings starting on the bed surface. The friction pressure drop in annulus will decrease by increasing the height of cuttings bed. With the increase of the wall roughness of the cuttings bed or the decrease of the height of the cuttings bed, the shear stress acting on the bed surface decreases when the drilling fluid flows, which is not conducive to the starting of the cuttings on the bed surface. The shielding effect is easily formed at the intersection of drill string and bed surface.
【作者单位】：中国石油塔里木油田分公司油气工程研究院;中国石油长庆油田分公司第一采油厂;
【基金】：国家自然科学基金项目“钻柱旋转作用的大位移井环空岩屑运移机制研究”(51204056)
【分类号】：TE254
【正文快照】： 0引言在钻井过程中,由于钻井液携岩效率的限制,岩屑颗粒将在重力作用下沉降,并在水平井段环空井眼低边逐渐沉积成床。当钻柱旋转或静止时,环空岩屑床呈现不同的分布状态。因此,研究不同环空结构下的钻井液流动规律对保持井眼清洁具有重要意义。目前国内外针对无岩屑床环空

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