Development of Thermite and Its Injection Mechanism for Drilling Tool Melting and Cutting
In order to free the stuck drill string rapidly,the high energy flame generated by thermite com-bustion is diverted by a special jet mechanism to carry out rapid circular melting of stuck pipe string,which is one of the important means of efficient and rapid release of stuck pipe string in deep wells.In this paper,combined with the ground melting penetration and ablation test of a large number of metal plates,a special thermite agent suitable for the melting and cutting operation of the pipe string was devel-oped,at the same time,a ejecting mechanism that can realize radial drainage of the flame was developed according to the characteristics of the jet flame,and experimental tests were carried out.Experimental re-sults show that:the thermite has strong ablative penetration ability to the metal plate,and the effective melting penetration of the metal plate with a thickness of 12 mm can be achieved within 5 s by using the thermite agent column with a diameter of 38 mm and a height of 90 mm.After the ejecting mechanism ac-celerates the axial high-speed flame through the flow hole and turns radially on the drainage surface,it can complete the 360°circumferential full coverage of the pipe string,which ensures the smooth implementa-tion of the circumferential melting cutting of the pipe string.This research provides important technical support for the development of cutting tools within the drilling tools in high temperature molten down-hole,and lays a key foundation for the formation of efficient and rapid cutting technology for tubular col-umns in distress.
drill pipe releasehigh temperature meltingthermitedrainage jet
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