RU38498U1 - PIPE OF PUMP-COMPRESSOR OR DRILLING CORE, COUPLING AND ADAPTER FOR CONNECTING PIPES OF PUMP-COMPRESSOR OR DRILLING CORE - Google Patents

Description

Pipe of a tubing or drill string, coupling and adapter for connecting pipes of a tubing or drill string

The proposed utility models relate to the oil and gas industry, namely, to the designs of the connections of pumping or drill pipes in terms of ensuring the durability of threaded joints.

The known utility model No. 10823, F16L 15/08, published in BI No. 8, 08/16/99, "Pipe tubing or drill string containing a coupling and an adapter.

According to a utility model, turnkey corrugations are applied to the surfaces of the coupling and adapter, and the threaded surfaces of these parts are chemically-thermally or heat-treated or wear-resistant coated.

A disadvantage of the known utility model is that the claimed technical solution does not indicate the specific type of protective coating, thickness and method of application. As a result, this solution has no tangible practical benefit.

Closest to the claimed technical solutions is a utility model No. 30913, F16L 15/08, publ. 07/10/03, BI .№ 19, “Pipe tubing or drill string selected by the applicant as a prototype.

According to a known utility model, the pipe of a pumping compressor or drill string contains a coupling and an adapter, on the threaded surfaces of which

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diffusion galvanizing with a coating thickness of 25. 10 μm, and on all other surfaces of the coupling and the adapter diffusion powder galvanizing was performed with a coating thickness in the range from 15 to 150 μm.

A disadvantage of the known utility model is the large thickness of the coating, especially on non-threaded surfaces of parts, which leads to increased consumption of zinc.

If the dimensions of the threaded surfaces of the pipe, coupling and adapter with the maximum permissible deviations and maximum coating thicknesses are met, collectability of the threaded pairs will deteriorate, which, if the specified tightening torque is exceeded, can lead to damage to the anti-corrosion coating.

The technical result of the claimed utility models is the elimination of these shortcomings, namely: -facilitate the collection of threaded pairs;

-increasing the corrosion resistance of threaded joints; -decrease in zinc consumption and coating cost. The technical result is achieved by the following solutions. In a pipe of a tubing or drill string containing a hollow cylindrical body with external end threads, the surfaces of which are coated with a thermal diffusion galvanizing method, according to the first utility model, the protective coating of thread surfaces consists of two layers: zinc coating, thickness 14, about μm , and deposited on zinc phosphate film with a thickness of microns.

In a coupling for connecting pipes of a tubing or drill string containing a hollow cylindrical body with internal end threads, on the surfaces of which

a protective coating is applied by the method of thermal diffusion galvanizing, according to the second utility model, the protective coating of the surfaces of the coupling consists of two layers: a zinc coating, thickness, about μm, and a phosphate film deposited on zinc with a thickness of μm.

In the adapter for connecting pipes of a tubing or drill string containing a hollow cylindrical body with internal and external end threads, according to a third utility model, the protective coating of the surfaces of the adapter consists of two layers: zinc coating, thickness, about μm, and phosphate deposited on zinc films with a thickness of microns.

The performance of a protective coating on the surfaces of the external end threads of a hollow cylindrical pipe casing of a pump compressor or drill string, consisting of two layers: a zinc coating, a thickness of about μm, and a phosphate film deposited on zinc with a thickness of 2 μm, increases the corrosion resistance of threaded joints, since the total resistance The claimed combined coating of any thickness is always higher than the resistance of only zinc coating of the same thickness, reduces zinc consumption and coating cost.

Performing a protective coating on the surfaces of the cylindrical body of the coupling of a tubing or drill string, consisting of two layers: a zinc coating, micron thick, and a phosphate film deposited on zinc micron thick, increases the corrosion resistance of the surfaces of the coupling, threaded pairs: pipe-coupling and facilitates assembly pipes and couplings. Protective coating on surfaces

the adapter, which consists of two layers: a zinc coating, thickness, about μm, and a phosphate film deposited on zinc with a thickness of μm, increases the corrosion resistance of both the adapter and threaded joints of the adapter and connected pipes, and also facilitates the connection of the adapter with pipes.

The maximum thickness of the combined coating, comprising 17 μm, provides ease of collection of threaded pairs, and the presence of a phosphate film contributes to better retention of lubricant in them.

The maximum value of the zinc coating, component of 14 microns, provides savings in consumables - zinc.

The essence of the claimed technical solutions is illustrated by the drawing.

The threaded connection contains a sleeve 1, an adapter 2, and pipes 3.

On the threaded end surfaces of the pipes 3, the surfaces of the coupling 1 and the adapter 2, a combined protective coating is made consisting of two layers: zinc - 14 4 thick, about μm and a phosphate film deposited on zinc - μm thick.

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Claims (3)

1. A pipe of a tubing or drill string containing a coupling and an adapter, and on the threaded surfaces of the coupling and the adapter, protective coatings are applied by the method of thermal diffusion galvanizing, characterized in that the protective coating of the surfaces of the threads consists of two layers: zinc coating, thickness 14 _{-4 , 0} μm, and a phosphate film deposited on zinc with a thickness of 2 ^+1.0 μm. 2. A coupling for connecting pipes connecting a tubing or drill string, containing a hollow cylindrical body with internal end threads, the surfaces of which are coated with a thermal diffusion galvanizing method, characterized in that the protective coating of the coupling surfaces consists of two layers: zinc coating, thickness 14 _-4.0 microns, and a phosphate film deposited on zinc with a thickness of 2 ^+1.0 microns. 3. An adapter for connecting pipes of a tubing or drill string containing a hollow cylindrical body with internal and external end threads, characterized in that the protective coating of the surfaces of the adapter consists of two layers: zinc coating, _14-4.0 microns thick, and applied on zinc phosphate film with a thickness of 2 ^+1.0 microns.