旋流扶正器井眼清洁效率规律研究
发布时间：2018-12-16 07:58
【摘要】：水平井段注水泥过程中,为有效清洗底边环空的钻井液滤饼和岩屑床,通常使用旋流扶正器来改变顶替流场,提高井眼清洗效率。为研究旋流扶正器对钻屑的运移及钻井液滤饼清洗的效果,文章通过流动模拟试验对比了旋流扶正器对注水泥过程井眼流场的影响,分析了钻屑运移机理,推导了钻屑起动速度。研究表明旋流流场具有更强的钻屑运移能力,其原因是旋流产生的切向流速提高了环空流体对钻屑的举升能力。但旋流效果和钻屑清除效率与旋流扶正器肋片高度、安放距离等因素有关。旋流扶正器必须有合理的形状结构与安放间距,才能获得有效的井眼清洗效果。
[Abstract]:In the process of cement injection in horizontal section, in order to effectively clean filter cake and cuttings bed of drilling fluid with bottom edge annulus, swirl centralizer is usually used to change the displacement flow field and improve the efficiency of wellbore cleaning. In order to study the effect of swirl centralizer on drilling cuttings migration and filter cake cleaning of drilling fluid, the effect of swirl centralizer on wellbore flow field during cement injection was compared by flow simulation test, and the mechanism of cuttings migration was analyzed. The starting speed of drilling chip is deduced. The results show that the swirl flow field has a stronger migration ability of drilling chip because the tangential velocity of swirl flow increases the lifting ability of annular fluid to drilling chip. However, the swirl effect and the efficiency of chip removal are related to the height of rib and placement distance of swirl centralizer. The swirl centralizer must have reasonable shape, structure and spacing in order to get an effective hole cleaning effect.
【作者单位】： 西南石油大学石油工程学院;中石化西南石油工程有限公司;中石油川庆钻探公司国际工程公司;
【基金】：国家科技重大专项课题“钻井工程一体化软件”(2016ZX05020-006)
【分类号】：TE256
[Abstract]:In the process of cement injection in horizontal section, in order to effectively clean filter cake and cuttings bed of drilling fluid with bottom edge annulus, swirl centralizer is usually used to change the displacement flow field and improve the efficiency of wellbore cleaning. In order to study the effect of swirl centralizer on drilling cuttings migration and filter cake cleaning of drilling fluid, the effect of swirl centralizer on wellbore flow field during cement injection was compared by flow simulation test, and the mechanism of cuttings migration was analyzed. The starting speed of drilling chip is deduced. The results show that the swirl flow field has a stronger migration ability of drilling chip because the tangential velocity of swirl flow increases the lifting ability of annular fluid to drilling chip. However, the swirl effect and the efficiency of chip removal are related to the height of rib and placement distance of swirl centralizer. The swirl centralizer must have reasonable shape, structure and spacing in order to get an effective hole cleaning effect.
【作者单位】： 西南石油大学石油工程学院;中石化西南石油工程有限公司;中石油川庆钻探公司国际工程公司;
【基金】：国家科技重大专项课题“钻井工程一体化软件”(2016ZX05020-006)
【分类号】：TE256
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