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| Vibration mechanics analysis of a perforating string under the influence of multiple factors |
| YANG Wenwu1,LI Hao1,LIN Yong2,REN Siwu3,ZHANG Zhiliang1,4,XU Shaojun5,LI Fuqiang5 |
| 1.School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China;
2.Sichuan Baoshi Machinery Petroleum Drill Bit Co., Ltd., Chengdu 610052, China;
3 Downhole Operation Company of CNPC Western Drilling Engineering Co., Ltd., Karamay 834000, China;
4.School of Automation, Chengdu University of Information Technology, Chengdu 610200, China;
5.Engineering Technology Research Institute of China Petroleum Western Drilling Engineering Co., Ltd., Urumqi 830011, China |
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Abstract The impact load produced by the shaped charge perforating detonation acts on the downhole perforating string system, causing accidents such as tubing fracture and buckling. The effects of self-weight, perforating fluid damping, stratigraphic confining pressure, and explosive impact load were incorporated, and a dynamic model for the tubing-perforating gun system under perforation impact load was established. The differential equation for longitudinal vibration of the string in the perforation interval was derived. Finite element software was employed to conduct a dynamic response analysis of the perforated interval of the string. The simulated results were compared and validated against theoretical numerical solutions. The results reveal that stress waves propagate from the bottom of the string upward. Both the equivalent stress of the string and the axial displacement exhibit periodic changes and gradually attenuate. Analyzed the effects of different tubing lengths, outer diameters, wall thicknesses, and single explosive quantities of the perforating gun on the dynamic response of the string. Based on the numerical simulation results, the empirical formula for the peak stress of the string in the perforated interval was obtained by fitting with multiple nonlinear regression using MATLAB software. The formula was then compared with the field test data to verify the reliability of the formula.
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Received: 13 June 2023
Published: 28 May 2024
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