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Causes and Risk Analysis of Low Pressure Brittle Fracture of Geological Drill Pipe
Release time:
2019-05-31
Author:
Source:
Analysis of the Causes and Risks of Low Pressure Brittle Fracture of Geological Drill Pipe Geological drill pipe often encounters rock formations with hardness above medium weathered in the foundation construction, which requires a set of pile machine sharp tool with perfect configuration to improve our construction progress. Let's talk about the relevant contents of geological drill pipe, geological drill pipe-the cause and danger of low pressure brittle fracture of geological drill pipe! Low stress brittle fracture of geological drill pipe accounts for a large proportion of the whole drill string failure, and its risk is also very high. Low stress brittle fracture occurs in both geological drill pipe and drill string conversion joints. Such as brittle fracture of geological drill pipe welds and drill stand and drill string adapter screw
Causes and Risk Analysis of Low Pressure Brittle Fracture of Geological Drill Pipe
Geological drill pipe in the foundation construction often encounter geology in the medium weathered above the hardness of the rock, which requires a set of well-equipped pile machine tool to improve our construction progress. Here to talk about the relevant content of geological drill pipe,geological drill pipe--Causes and dangers of low pressure brittle fracture of geological drill pipe!
Low-stress brittle fracture of geological drill pipe accounts for a considerable proportion of the entire drill string failure, and its risk is also very high. Low-stress brittle fracture occurs in both geological drill pipe and drill string adapter.. For example, the brittle fracture of the welding seam of the geological drill pipe and the brittle fracture of the threaded part of the drill stand and the drill string adapter are caused by fatigue damage. Its remarkable feature is that there is no macroscopic precursor before the sudden fracture, which cannot be found out by general lateral means, thus causing catastrophic accidents unconsciously..Therefore, low stress brittle fracture is one of the most dangerous fracture methods.
How to choose to use geological drill pipeWhat?
1According to the drilling capacity parameters and drilling diameter of the drilling rig, the drilling depth can beD/d=4.5The empirical ratio determines the diameter of the geological drill pipe.
The maximum allowable length of the geological drill pipe of the rotary drilling rig shall be determined according to the effective height of the mast and the stability under the condition of self-weight, and then the number of sections of the geological drill pipe of the rotary drilling rig shall be determined according to the design hole depth of the drilling rig and the effective use length of each geological drill pipe.
2According to the main parameters of geological drill pipe design, I .e. torque, the feed pressure is used to rotary drill pipe. We know that the transmission torque of the geological drill pipe is transmitted by the engagement and extrusion of the key and the keyway. Due to the processing accuracy, material properties, welding quality and other reasons, it is impossible to divide the torque evenly on each key ideally, and each contact key cannot contact the force evenly, so the long key is often damaged by twisting, when selecting the design torque of the geological drill pipe of the rotary drilling rig, it must be greater than the design torque of the drilling rig.
Cause Analysis of Shaft Break:
1The transmission shaft is limited by its own structural strength and alternating stress, which is the weak link of drilling tool strength. In the composite drilling state, the working condition is even worse.
2The shaft body material selection is unreasonable or the heat treatment process is improper, and the mechanical strength is low.
3The transmission shaft is subjected to alternating load for a long time, resulting in fatigue cracks.
4. The thread of the shaft body is retreated or the transition at the variable diameter is poor, forming a stress collection towel. geological drill pipe
Shandong Yiguang Drilling and Production Technology Co., Ltd. produces various geological drill pipes for drilling engineering., spiral drill pipe,triangular drill pipe,coal drill pipe,Drill,Drill pipe, etc., complete specifications!Strength manufacturers,Trustworthy!Company set research and development-Production-Sales-After sales as a whole, welcome customers to purchase, fixed telephone:0635-2311078Mobile phone number13508920928
Yikuang Technology official website http://www.ykzckj.com
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Key words:
Drill pipe, geology, drilling rig, technology, stress, cause, design, pressure
