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1. 发明授权

US5284207A Method of cleaning a well bore prior to a cementing operation 失效
标题翻译：在固井操作之前清洁井眼的方法
公开(公告)号：US5284207A
公开(公告)日：1994-02-08
申请号：US882778
申请日：1992-05-14
申请人： Simon H. Bittleston , Andrew Hunt , Mostafa A. Tehrani
发明人： Simon H. Bittleston , Andrew Hunt , Mostafa A. Tehrani
IPC分类号： C09K8/528 , E21B21/14 , E21B33/14 , E21B33/16 , E21B37/00
CPC分类号： E21B21/14 , C09K8/528 , E21B33/14 , Y10S507/928
摘要： Once the drilling of an oil or gas well is finished the bore must be cased and cemented. It is important that the cement lining be complete, and to ensure this it is necessary to sweep out the mud in the annulus ahead of the rising cement. Unfortunately, this often proves difficult, and various procedures and mechanisms have been devised in the past to improve the chances of achieving efficient mud-removal and forming a complete cement lining, though none have been truly successful. One of the techniques presently employed involves the utilization of a wash, but it has been noted that such a wash, even when turbulent, has very little component of its movement in the annulus in a direction other than up along the annulus, and that as a result it has very little effect on gelled mud deposits, especially those in the small casing/bore inter-distance of a severely eccentric casing. It has now been discovered that a considerably increased amount of lateral motion, and thus a very significantly enhanced degree of mud removal capability, is provided if the liquid be a multiphase liquid in which one of the phases is a gas--in other words, if the liquid be full of bubbles--and the invention provides a cleaning method particularly suitable for the cleaning of gelled mud deposits off the casing and bore walls of an oil/gas well prior to cementing the casing in place, in which there is caused to flow over and in contact with the dirty surface a "burbulent" liquid.
摘要翻译：一旦油井或气井的钻探完成，钻孔必须被套管并粘结。重要的是，水泥衬里是完整的，并且为了确保这样做，必须清除上升水泥前面的环空中的泥浆。不幸的是，这往往证明是困难的，过去已经设计了各种程序和机制，以提高实现高效除泥和形成完整水泥衬里的机会，尽管没有一个确实取得成功。目前使用的技术之一涉及洗涤的利用，但是已经注意到，即使是湍流，这种洗涤在环形空间中沿着环形物沿着除了向上的方向的运动的非常小的分量也是如此结果对凝胶泥沉积物的影响非常小，特别是严重偏心套管的小套管/孔间距的影响。现在已经发现，如果液体是其中一个相是气体的多相液体，则提供显着增加的横向运动量，并且因此非常显着地提高泥浆去除能力的程度，换句话说，如果液体充满气泡，本发明提供了一种清洁方法，特别适用于在将套管固定在适当位置之前，将套管和油/气井的孔壁清除凝胶泥浆沉积物，其中流动并且与脏表面接触一个“湍流”液体。

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