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Causes and Hazards of Low Pressure Brittle Fracture of Geological Drill Pipe
Release time:
2019-05-26
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Source:
Shandong yi mining drilling technology co., ltd. production of drilling engineering dedicated to all kinds of geological drill pipe, spiral drill pipe, triangular drill pipe, coal drill pipe, drill bit, drill pipe, complete specifications! Strength manufacturers, trustworthy! company set research and development-production-sales-sales as one, welcome customers to purchase, tel: 0635-2311078
In the foundation construction, we often encounter the rock layer with the hardness above the medium weathered in the geology, which requires a set of pile machine sharp weapon with perfect configuration to improve our construction progress. Here to talk about the relevant content of the 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 drill pipe and drill string adapter.. For example, the brittle fracture of the drill pipe weld and the brittle fracture of the drill stand and the thread of the drill string conversion joint are caused by fatigue damage, and their remarkable characteristics are that there is no macroscopic precursor before the sudden fracture, which cannot be found by general lateral measurement means, thus causing catastrophic accidents unconsciously..Therefore, low stress brittle fracture is one of the most dangerous fracture methods.
Drill pipe should be regularly maintained
14. Drill pipe shall be regularly maintained and the maintenance period shall be determined according to the service environment and air humidity, and antirust oiling and dustproof treatment shall be carried out regularly.
2The use of drill pipe shall be within the rated drilling distance of the drilling rig, and the matching drill pipe shall be selected according to the technical parameters of the drilling distance and the model of the drilling rig.
3The new coal drill pipe series products are based on the original old twist coal drill pipe, using high-quality steel pipe andTThe welded steel strip structure is manufactured by advanced prestressed winding welding process. This product has a light weight(Lighter than old twist drill pipe45%), the footage is fast, the dust is small, the vertical downward drilling does not leave rock debris, and the hole is cleared. The rod body can be used separately from the drill tail to extend the service life. Spring pin or threaded connection, convenient and fast. This product is divided into single spiral blade, compound spiral blade and water type and dry type, especially suitable for high-density mine water exploration and gas drilling. In the mine high-density water exploration and gas discharge drilling or other special environment operations, it is necessary to determine the reasonable drilling depth according to the actual material physical properties and parameters of the drill pipe.
4When the drill pipe and the drill bit are used together, the drill bit should be larger than the diameter of the drill pipe under normal circumstances, and the condition of the drill and the drill pipe should be paid attention to at all times during the drilling process. In case of sticking, locking, etc., stop drilling immediately or drill slowly after returning to ensure that the drill pipe is not bent and deformed.
5When the drill pipe is ventilated or ventilated, the drill pipe shall be tightly connected during drilling. When the drill pipe has seals, as shown inOThe seal ring should pay attention to the use of the seal, and replace the seal in time when it is damaged or corroded. After the drilling is completed, do maintenance and cleaning work on the seal.
62. The drill pipe shall be connected manually and correctly during drilling to ensure close coordination. It is not possible to directly drill with drilling rig to prevent damage to the drill pipe.
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.
Due to the increasing difficulty of oil and gas exploration and exploitation, deep wells, horizontal wells, large displacement wells, sulfur environment, low temperature environment, etc., the performance requirements of drill pipe are getting higher and higher.Beneficial Mining TechnologyUsing heat treatment technology, friction welding technology and advanced production and testing equipment, a new type of drill pipe with advanced level is developed and produced.Beneficial Mining TechnologyProduct quality is superior, the price is reasonable, the service life is long! In addition, our company at the same time through independent research and development to provide users with a variety of special products and high-end products to meet customer differences, personalized needs. Warmly welcome new and old customers to visit the purchase.
Key words:
Geological drill pipe
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