A method of manufacturing a drill pipe lockless design of aluminum alloy

 

(57) Abstract:

Usage: during thermomechanical processing of metals in metallurgy. The inventive method includes molding a hollow billet, homogenization, extrusion pressing thickened outward and inward ends, heat treatment, straightening and cutting at the nominal size, and after heat treatment carried out radial compression of one end of the workpiece and the radial thrust of the other at a temperature creep component of 0.2 -0,65 from the melting temperature of the pipe material, and the voltage equal performance, with subsequent cooling in water and then wrapped around the protectors in the form of a steel conical shell with embossed carvings, the size of which corresponds to the sizes of the threads of the pipe and heat the ends of the pipe to a temperature creep. 2 C.p. f-crystals.

The invention relates to the field of thermo-mechanical processing of metals and can find application in metallurgy.

Closest to the proposed method to the technical essence and the achieved result is a method of manufacturing a drill pipe of aluminum alloy lockless design, including casting hollow billets, homogenization, extrusion size, tapping (Drilling pipes of aluminium alloys, M. Nedra, 1980, S. 157 159, 29 to 32.

Dignity pipes manufactured according to the mentioned technologies is less damaging their intermediate columns during drilling complex multi-column designs.

However, in the method of manufacturing incorporated and the lack of thread is formed of aluminum alloy, which determines the low wear resistance of the threaded connection (see S. 157, 158 prototype).

The purpose of the invention increase the wear resistance of the threaded connection.

This objective is achieved in that in the method of manufacturing a drill pipe lockless design of aluminum alloy, comprising molding a hollow blank pipe, homogenization, extrusion pressing thickened outwards and inwards of the ends of the workpiece, heat treatment, straightening, cutting to the nominal size, the threading, unlike the prototype, after heat treatment at the beginning of the lead radial compression of one end of the workpiece and the radial distribution of the other end at a temperature creep component 0,2 0,65 from the melting temperature of the pipe material, and the voltage equal performance, with subsequent cooling in water, and C heat the ends of the workpiece to a temperature creep.

The best result in improving the wear resistance of threaded joints obtained by deformation under creep conditions at a temperature of 200oC and a voltage of 17 kg/mm2and when re-heating to 200oC.

The most wear-resistant threaded connection is obtained when the protector take the size of the thread corresponding to the sizes of the threads on the ends of the workpiece.

The presence of the above signs indicates the technical solutions according to the criterion of "novelty."

Similar technical solutions, in which the residual strain was observed in the course of plastic deformation under creep conditions, and subsequent heating was carried out with conducting reverse creep, the authors have not detected. Based on this we can conclude about the relevance of the proposed technical solutions to the criterion of "significant differences".

The proposed method allows to protect from wear during operation of the threads, made in aluminium alloy, with steel thread protectors with minimal output on the outer surface of the drill string and is not a source of wear of the intermediate columns. is Rymer. Made, including heat treatment, the workpiece drill pipe alloy D16 lockless design size h mm with an outer diameter of the thickened ends 180 mm. Spent deformation radial compression nipple end and radial thrust coupling under creep conditions at 200oC and a voltage of 17 kg/mm2with the subsequent unloading and cooling. For socket and spigot pipe end cut respectively the inner and outer locking thread 3-147 according to GOST 5286-75 with end stops at the larger base of the cone. Explosive punching made two steel protector in the form of a conical shell with embossed thread 3-147 and flange face. The wall thickness of the shells took 1.5 mm After newarchive and tightening protectors on the nipple and coupling the ends of the pipe was heated to 200oC, causing the reverse creep in aluminum alloy, which gave reliable fastening of the protectors on the threads of the nipple and coupling. Adopted by the thickness of the body of the protector 1.5 mm corresponds to the thickness of the flange end face 24 mm In the preparation of the drill string such pipe flanges tread face to the outer surface of the drill string. 24 mm is relatively small output, which structurally can be even more clever and aluminum alloy, including casting hollow billets pipe, homogenization, extrusion pressing thickened outwards and inwards of the ends of the workpiece, heat treatment, straightening, cutting to the nominal size, the threading, characterized in that, with the aim of improving the durability of the threaded connection, after heat treatment, the first lead radial compression of one end of the workpiece and the radial distribution of the other end at a temperature creep component 0,2 0,65 from the melting temperature of the pipe material, and the voltage equal performance, with subsequent cooling in water, and then wrapped around the ends of the workpiece protectors in the form of a steel conical shell with embossed carvings and heat the ends of the workpiece to a temperature creep.

2. The method according to p. 1, characterized in that the deformation of the ends of the workpiece is carried out at 200oC and a voltage of 170 g/mm2and re-heating is carried out until 200oC.

3. The method according to p. 1, characterized in that the protector take the size of the thread corresponding to the sizes of the threads on the ends of the workpiece.

 

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