Safety analysis and application of special connection threads for ultra-high-torque screw drilling tools

doi:10.3969/j.issn.1006-6535.2026.01.015

Abstract

Abstract: The threaded connection is the weak link in the housing of a screw drilling tool.To reduce the occurrence of thread fracture failures during downhole operations and improve the mechanical performance of connection threads,finite element simulation was used to analyze the load-bearing characteristics,mechanical performance,fatigue resistance,and vibration resistance of four new special connection thread structures under complex loads.A field application of the optimized new special connection thread was carried out in the LU208H2 Block.The results indicate that the new special connection thread structure Ⅲ exhibits better load-bearing performance.Under complex loads and alternating bending moments,its structural strength meets material strength safety requirements,and the failure risk is low.Under vibrational excitation loads,the contact pressure distribution of the special connection thread structure Ⅲ is relatively uniform and meets strength safety requirements,demonstrating good vibration resistance.In field trials,the new special connection thread structure Ⅲ not only enhanced the mechanical performance of the drilling assembly and the rock-breaking effectiveness of the bit,but also allowed a single connection thread to operate continuously for over 1500 hours without any failures,showing excellent performance.These results provide reference for the structural design of connection threads in ultra-high-torque screw drilling tools.

Key words: screw drilling tool, load-bearing performance, complex load, circumferential stress, vibrational excitation, contact pressure

CLC Number:

TE921

XIONG Jianhua, YI Xianzhong, QIN Saibo, CHEN Zhixiang, YI Jun, XIONG Yuancai, YIN Zuopeng, XU Yonghe. Safety analysis and application of special connection threads for ultra-high-torque screw drilling tools[J]. Special Oil & Gas Reservoirs, 2026, 33(1): 130-139.

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