Coiled Tubing Drag Acidification Technology

In recent years, with the increasing horizontal wells, an urgent need to develop a suitable level of new wells yield Technology. Drag the acidification of coiled tubing technology is in this context to develop a new output technology. However, because of the coiled tubing in horizontal wells insufficient understanding of the mechanical properties, Often coiled tubing at the hanging heavy on the reading list for the coiled tubing confused with the actual subject of the Rally, coiled tubing failure occurred in the application,coiled tubing can not come to a predetermined depth and so on.In response to these problems, This study ideas as follows:force analysis of coiled tubing in Acidification of coiled tubing, locking condition of analysis, calculation of friction pressure drop, acid system, and a series of studies, Propose a more scientific and reasonable method of matching the design and explore a set of design process, to establish a design specification. With M005-H5 Well, for example, sub-method of calculation used to calculate the coiled tubing in horizontal wells by the axial force and spiral bending of the critical axial buckling force, and thus determine the course of the coiled tubing into the next will occur lock. By locking conditions, the analysis pointed out the increase under paragraph coiled tubing in horizontal depth of approach. And use the fourth strength theory, the axial tension in the coiled tubing under the influence of internal and external pressure from a comprehensive stress of checking.The results of research carried out by the dragging acidification of coiled tubing technology, the practical application, especially in the Mo xi Gas Field testing of multi-port Inoue, achieved good economic results, proved that the technology has broad application prospects.