Development and application of eccentric fishing barrel with three slips for screw drilling tools

MA Tan

doi:10.12143/j.ztgc.2024.06.012

2024 Vol. 51, No. 6

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MA Tan. 2024. Development and application of eccentric fishing barrel with three slips for screw drilling tools. DRILLING ENGINEERING, 51(6): 99-105. doi: 10.12143/j.ztgc.2024.06.012

Citation:

MA Tan. 2024. Development and application of eccentric fishing barrel with three slips for screw drilling tools. DRILLING ENGINEERING, 51(6): 99-105. doi: 10.12143/j.ztgc.2024.06.012

Development and application of eccentric fishing barrel with three slips for screw drilling tools

MA Tan^1,2,3,4

1. National Mine Emergency Rescue Shandong Special Survey Team, Jining Shandong 272000, China;
2. China University of Petroleum (Beijing ), Beijing 102249, China;
3. Key Laboratory of Mine Drilling and Rescue of Shandong Provincial Department of Emergency Management, Jining Shandong 272000, China;
4. The Second Exploration Team of Shandong Coalfield Geology Bureau, Jining Shandong 272000, China

Received Date: 05 February 2024

Revised Date: 07 May 2024

Abstract

Abstract

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.
- screw drilling tools /
- fishing tools /
- lightweight falling objects /
- eccentric structure /
- three slips eccentric fishing barrel

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References

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