RU27664U1 - PIPE OF PUMP-COMPRESSOR OR DRILLING CORE - Google Patents

Description

Tubing or drill pipe

The inventive utility model relates to the design of the connections of tubing or drill pipe used for drilling exploration, oil and gas wells and their operation.

There is a problem of increasing the durability and reliability of oil assortment pipes. This primarily relates to tubing and oil and gas pipelines, which during operation are particularly intensively exposed to corrosive and erosive effects of aggressive environments and various mechanical loads. The most common causes of tubing accidents include corrosion, thread wear, fatigue failure, and in 70% of cases threaded joints are destroyed.

If the threaded pipe joints have a high-quality, well-bonded sewn finish, and at the same time the tight connection is ensured, then its high corrosion resistance is also achieved.

Diffusion galvanizing of oil-grade tubes is known, in which a sew is obtained; total zinc coating with a thickness of 10 μm, which can significantly increase corrosion resistance. However, since the ends of the pipes are most destroyed, an additional nipple made of plastic or steel, preferably with a zinc coating, is installed (see "Diffusion zinc coatings, authors E.V. Proskurkin and N.S. Gorbunov, Moscow, ed. "Metallurgy, 1972, p. 225). This allows you to extend the life of the pipes.

The closest to the claimed utility model for the combination of essential features is the “Pipe of a pumping compressor or drill string (see utility model certificate No. 10823, IPC (6) F 16 L 15/08, published in Bulletin PMPO, No. 8, 16.08.99 , p. 101), containing a connecting sleeve and an adapter at the threaded ends, characterized in that the working surfaces of the coupling and the adapter

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made of wear-resistant, and on the outer surfaces of the coupling and the adapter turnkey corrugations are applied, and the working surfaces of the coupling and adapter are subjected to either heat treatment or heat treatment, or wear-resistant coating is applied.

The utility model certificate adopted for the prototype lists all known methods for processing the working surfaces of the coupling and adapter in general form (see Polytechnical Dictionary, ed. "Soviet Encyclopedia, 1989, p. 580), a specific coating type, its parameters , the certificate does not give a method of its application.

The task to which the claimed utility model is aimed was to find the best option for coating and its thickness, providing corrosion protection, tightness, strength of joints, increasing the service life and facilitating the process of mounting and dismounting.

This goal is achieved by the fact that diffusion powder galvanizing with a coating thickness of microns is made on the threaded surfaces of the coupling and the adapter in a pipe of a compressor or drill string containing a coupling and an adapter on the threaded ends subjected to chemothermal treatment.

List of drawings

The drawing shows a section of a tubing with an adapter and a sleeve.

The tubing string includes a cylindrical coupling 1 having an internal threaded surface mating with an external threaded surface of an adapter 2 screwed to the external thread of the pipe 3.

Powder diffusion galvanizing was performed on the threaded surfaces of the coupling and adapter in zones A and B. It has been experimentally established that the best results are obtained by the thickness of the powder coating. A coating thickness of less than 15 μm does not give a positive result, since the thread can be uncovered with zinc, which leads to leaks and corrosion. The coating thickness of more than ZOkmm leads to the release of dimensions beyond the thread tolerance field and possible peeling of zinc due to stresses.

Thus, the performance of diffusion powder galvanizing with a coating thickness of microns on the threaded surfaces of the coupling and the adapter allows you to simultaneously:

-improve the tightness of threaded pipe joints;

-increase the corrosion resistance and wear resistance of the threaded pair "pipe - coupling;

-increase to 10 - 15 the number of operations

- increase the service life.

Powder diffusion zinc coating is applied to threaded joints of all types of oil assortment pipes.

Claims (1)

A pipe of a tubing or drill string containing a coupling and an adapter on the threaded ends subjected to chemical-heat treatment, characterized in that diffusion powder galvanizing with a thickness of 25 ⁺ _5-10 microns is performed on the threaded surfaces of the coupling and adapter.