CN212428630U - Anti-corrosion wear-resistant tubing coupling - Google Patents

Abstract

The utility model discloses an anticorrosive wear-resisting tubing coupling, including the coupling body, processing has the internal thread on the inner wall of coupling body, follows annular inner wall recess has been seted up to coupling body inner wall length direction's intermediate position, and build-up welding has the anticorrosive wearing layer of coupling in the annular inner wall recess, processing has on the anticorrosive wearing layer of coupling the internal thread. Oil pipe passes through the utility model discloses connect the oil pipe column of constitution in order when carrying crude oil, the utility model discloses with crude oil direct contact's structural position and crude oil permeable to oil pipe and the utility model discloses a threaded connection department has all made anticorrosive wear-resisting protection, has good corrosion and wear resistance.

Description

Anti-corrosion wear-resistant tubing coupling

Technical Field

The utility model relates to an oil pipe coupling, specifically speaking relate to an anticorrosive wear-resisting oil pipe coupling.

Background

A tubing string is a pipe that carries crude oil and natural gas from a hydrocarbon reservoir to the surface and is used to withstand the pressures generated during production. The oil pipes are connected in sequence through oil pipe couplings to form the oil pipe column.

Along with the continuous deepening of oil field exploitation, many oil fields in China enter a medium and high water content development period, the water content is continuously increased, and simultaneously, a large amount of corrosive media such as CO exist in crude oil₂、H₂S、Cl^-And a small amount of dissolved oxygen and sulfate reducing bacteria accelerate the corrosion of the oil string, shorten the repair-free period of the oil well, increase the maintenance times of the oil well, and seriously affect the safety and development efficiency of the oil field.

When the oil pipes are connected in sequence through the oil pipe coupling to form the oil pipe string, the adjacent oil pipes are connected with the internal thread of the oil pipe coupling in a matching way through the external thread at the end part, a gap is formed between the end parts of the adjacent oil pipes positioned in the oil pipe coupling, when the oil pipe string is put into an oil well, and crude oil is conveyed to the ground surface through the oil pipe string, the crude oil can be directly contacted with the internal thread of the oil pipe coupling positioned in the gap between the end parts of the adjacent oil pipes, so that the corrosion to the internal thread at the gap is further caused, in addition, the crude oil can also permeate into the threaded connection part.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an anticorrosive wear-resisting tubing coupling, pass through when oil pipe the utility model discloses when connecting the constitution tubing string in order and carrying crude oil, the utility model discloses good corrosion-resistant, wear resistance have.

In order to solve the technical problem, the utility model relates to an anticorrosive wear-resisting tubing coupling, including the coupling body, processing has the internal thread on the inner wall of coupling body, follows the annular inner wall recess has been seted up to coupling body inner wall length direction's intermediate position, and build-up welding has the anticorrosive wearing layer of coupling in the annular inner wall recess, processing has on the anticorrosive wearing layer of coupling the internal thread.

Preferably, the coupling anticorrosion wear-resistant layer is a nickel-based alloy layer or a stainless steel layer.

Further, the length L of the annular inner wall groove₁38mm to 50 mm.

Oil pipe passes through the utility model discloses connect the oil pipe column of constituteing in order, the external screw thread of adjacent oil pipe tip with the utility model discloses an when interior screw-thread fit is connected, the clearance that is located between the inside adjacent oil pipe tip of oil pipe coupling is the anticorrosive wearing layer of coupling, has good corrosion-resistant, wear resistance, simultaneously the utility model discloses also be the anticorrosive wearing layer of coupling with the partial structure of oil pipe threaded connection department, can prevent that crude oil infiltration from causing the corruption of oil pipe coupling. The utility model discloses in length L of annular inner wall recess₁For 38mm ~ 50mm, the anticorrosive wearing layer of build-up welding coupling in it can guarantee that the clearance between the adjacent oil pipe tip and the part threaded connection structure between oil pipe tip and the oil pipe coupling are anticorrosive wear-resisting structure, guarantee the utility model discloses good anticorrosive wear resistance.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a coupling body in the prior art, showing a semi-sectional structure, wherein an inner wall of the coupling body is provided with an annular inner wall groove.

FIG. 2 is the view 1 after the coupling anti-corrosion wear-resistant layer is deposited in the groove of the annular inner wall.

FIG. 3 is a schematic view of the main view and half-section structure of the anti-corrosion and wear-resistant tubing coupling of the present invention.

Detailed Description

Referring to fig. 1-3, the utility model relates to an anticorrosive wear-resisting tubing coupling, including coupling body 1, processing has internal thread 2 on coupling body 1's the inner wall, follows annular inner wall recess 3 has been seted up to coupling body 1 inner wall length direction's intermediate position, and build-up welding has coupling anticorrosion wearing layer 4 in the annular inner wall recess 3, processing has on coupling anticorrosion wearing layer 4 internal thread 2. The coupling anticorrosion wear-resistant layer 4 is a nickel-based alloy layer or a stainless steel layer. The length L of the annular inner wall groove 3₁38mm to 50 mm.

The utility model relates to a main preparation method of anticorrosive wear-resisting tubing coupling does: firstly, an annular inner wall groove is arranged in the middle of the inner wall of the coupling body in the length direction, a lathe is adopted for rough turning, and the length L of the annular inner wall groove₁38 mm-50 mm as shown in figure 1; then, overlaying nickel-based alloy powder or stainless steel powder in the groove of the annular inner wall by using a plasma overlaying machine to form an anti-corrosion wear-resistant layer, as shown in figure 2; carrying out quenching and tempering heat treatment after surfacing so that the matrix of the steel plate reaches the specified hardness; after the quenching and tempering heat treatment, finish turning is performed, and as shown in fig. 3, internal threads are turned.

Claims (3)

1. The utility model provides an anticorrosive wear-resisting tubing coupling, includes coupling body (1), processing has internal thread (2), its characterized in that on the inner wall of coupling body (1): follow annular inner wall recess (3) have been seted up to coupling body (1) inner wall length direction's intermediate position, and build-up welding has coupling anticorrosive wearing layer (4) in annular inner wall recess (3), processing has on coupling anticorrosive wearing layer (4) internal thread (2).

2. An anti-corrosive wear resistant tubing coupling as claimed in claim 1 wherein: the coupling anticorrosion wear-resistant layer (4) is a nickel-based alloy layer or a stainless steel layer.

3. Preservation according to claim 1 or 2Wear-resisting tubing coupling, its characterized in that: the length L of the annular inner wall groove (3)₁38mm to 50 mm.

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