Development and application of eccentric fishing barrel with three slips for screw drilling tools
During the drilling process,accidents of screw drilling tools breaking and falling often occur.For lightweight falling objects caused by accidents such as detachment of the outer shell of the screw drilling tool and core pulling due to rotor fracture,the applicability and success rate of using conventional slip salvage barrels are insufficient.Based on this,a screw drilling tool three slip eccentric fishing barrel was designed,which drives the upper,middle,and lower slips to contract and clamp the conjugate annular space through the conical guide surface of the fishing barrel,achieving effective fishing of this type of falling objects.The eccentric arrangement structure design of the three slips increases the effective clamping area and improves the comprehensive fishing force of the fishing barrel on the screw drilling tool.Based on the working principle of the fishing barrel,a calculation formula for the conventional clamping force of the slip and the squeezing clamping force was established.By comparing,it was found that the conventional clamping stress of the slip required for the three eccentric fishing barrel can be reduced by 50.46%,and the bite depth of the fishing tool can be reduced by 13.92%.The trial produced fishing tube has been put into salvage practice on the construction site,indicating that its structural design is reasonable and its salvage performance is reliable.
国家科技期刊平台
NSTL
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