Corrosion-resistant seamless stainless steel pipe for gasoline exploitation

Abstract

The utility model relates to the technical field of oil exploitation, in particular to a corrosion-resistant seamless stainless steel pipe for gasoline exploitation. The corrosion-resistant seamless stainless steel pipe for gasoline exploitation comprises a seamless stainless steel pipe body, two sets of thickening rings are evenly arranged on the inner side wall of the seamless stainless steel pipe body, and the inner side wall and the outer side wall of the seamless stainless steel pipe body and the inner side wall and the outer side wall of the thickening rings are each coated with a passivation film. The outer side of the passive film located on the outer side walls of the seamless stainless steel pipe and the thickening ring is covered with an anti-corrosion layer, and the outer side of the anti-corrosion layer is covered with an anti-corrosion wear-resistant layer. Triple corrosion-resistant protection can be performed on the seamless stainless steel pipe and the thickening ring through mutual cooperation of the passive film, the corrosion-resistant layer and the corrosion-resistant and wear-resistant layer, and wear-resistant protection can be performed on the passive film and the corrosion-resistant layer by virtue of good wear resistance of the corrosion-resistant and wear-resistant layer, so that the corrosion resistance is effectively prolonged, and the service life of the seamless stainless steel pipe is prolonged. The ends of the seamless stainless steel pipes are thickened through the thickening rings, and the connecting strength of the ends of the two sets of seamless stainless steel pipes is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a corrosion-resistant seamless stainless steel pipe for oil exploitation. Background Technique

[0002] Oil steel pipes are one of the essential and most consumed finished materials in the processes of drilling and oil production. The main problems affecting the service life of oil steel pipes are the eccentric wear between the sucker rod and the oil steel pipe during the oil pumping process and the corrosion of the oil steel pipe by the inherent harmful gases in the oil well. In most oil and gas fields in China, there are phenomena such as high salinity, high content of sulfate-reducing bacteria (SRB), high content of CO2 gas, and low pH value underground, which cause serious corrosion of the underground oil steel pipes and sucker rods. Corrosion peeling and perforation of the oil steel pipes often occur, and fractures sometimes occur severely, increasing the oil production operation volume and oil production cost, affecting the single-well oil output and the normal production of oil and gas field enterprises.

[0003] At present, after the production of seamless stainless steel pipes is completed, quenching and passivation methods are mostly used to improve the corrosion resistance of seamless stainless steel pipes. However, the protective film formed on the surface of seamless stainless steel pipes by quenching and passivation is easily worn during the drilling process, thereby affecting the corrosion resistance of seamless stainless steel pipes. In view of the above situation, technical innovation is carried out on the basis of the existing corrosion-resistant seamless stainless steel pipes for oil exploitation. Content of the Utility Model

[0004] The purpose of the utility model is to provide a corrosion-resistant seamless stainless steel pipe for oil exploitation to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A corrosion-resistant seamless stainless steel pipe for oil exploitation, comprising:

[0006] A seamless stainless steel pipe, on the inner side wall of which two groups of thickening rings are evenly arranged. Passivation films are covered on the inner and outer side walls of the seamless stainless steel pipe and the thickening rings. An anticorrosion layer is covered on the outer side of the passivation film on the outer side wall of the seamless stainless steel pipe and the thickening rings, and an anticorrosion and wear-resistant layer is covered on the outer side of the anticorrosion layer.

[0007] Preferably, the seamless stainless steel pipe and the thickening rings are integrally formed, and the thickness of the thickening rings is the same as that of the seamless stainless steel pipe.

[0008] Preferably, the two groups of thickening rings are respectively located on the left and right sides of the inner side wall of the seamless stainless steel pipe, and the opposite sides of the two groups of thickening rings are flush with the left and right sides of the seamless stainless steel pipe.

[0009] Preferably, the passivation film is formed by passivating the seamless stainless steel pipe and the thickening rings with a passivation solution.

[0010] Preferably, the anticorrosive layer is perchloroethylene anticorrosive paint.

[0011] Preferably, the anticorrosive and wear-resistant layer is Guangna nano wear-resistant insulating anticorrosive coating.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In the present utility model, when two groups of seamless stainless steel pipes are butt-jointed, internal threads need to be provided on the inner wall of their ends, and an external thread joint is used for screwing. The ends of the seamless stainless steel pipes are thickened by a thickening ring, so as to prevent the cross-section of the end part from decreasing when threading the inside of the end of the seamless stainless steel pipe, thereby improving the connection strength of the ends of the two groups of seamless stainless steel pipes.

[0014] Through the mutual cooperation of the passivation film, the anticorrosive layer and the anticorrosive and wear-resistant layer, triple corrosion resistance protection can be provided for the seamless stainless steel pipe and the thickening ring. And benefiting from the good wear resistance of the anticorrosive and wear-resistant layer, the passivation film and the anticorrosive layer can be protected against wear, thereby effectively extending the corrosion resistance performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a corrosion-resistant seamless stainless steel pipe for gasoline extraction of the present utility model;

[0016] Figure 2 is a front sectional view of a corrosion-resistant seamless stainless steel pipe for gasoline extraction of the present utility model;

[0017] Figure 3 For the present utility model Figure 2 is an enlarged view of part A.

[0018] In the figure: 1, seamless stainless steel pipe; 11, thickening ring; 12, passivation film; 13, anticorrosive layer; 14, anticorrosive and wear-resistant layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1-3, A corrosion-resistant seamless stainless steel pipe for gasoline extraction, including seamless stainless steel pipe 1. Two groups of thickening rings 11 are evenly and fixedly arranged on the inner side wall of seamless stainless steel pipe 1. When two seamless stainless steel pipes 1 are butted, internal threads need to be opened on the inner wall of their ends, and external thread joints are used for screwing. The ends of seamless stainless steel pipe 1 are thickened by thickening rings 11, so as to prevent the cross-section of the end part from decreasing when threading the inside of the end of seamless stainless steel pipe 1, thereby improving the connection strength of the ends of two seamless stainless steel pipes 1. A passivation film 12 is covered on the inner and outer side walls of seamless stainless steel pipe 1 and thickening rings 11. An anti-corrosion layer 13 is covered on the outside of the passivation film 12 on the outer side walls of seamless stainless steel pipe 1 and thickening rings 11. An anti-corrosion and wear-resistant layer 14 is covered on the outside of anti-corrosion layer 13. Seamless stainless steel pipe 1 and thickening rings 11 are integrally formed. The thickness of thickening rings 11 is the same as that of seamless stainless steel pipe 1. Two groups of thickening rings 11 are respectively located on the left and right sides of the inner side wall of seamless stainless steel pipe 1. The opposite sides of two groups of thickening rings 11 are flush with the left and right sides of seamless stainless steel pipe 1. Passivation film 12 is formed by passivating seamless stainless steel pipe 1 and thickening rings 11 with passivating liquid. Anti-corrosion layer 13 is perchloroethylene anti-corrosion paint. Anti-corrosion and wear-resistant layer 14 is Guangna nano wear-resistant insulating anti-corrosion coating. Perchloroethylene anti-corrosion paint can effectively prevent seamless stainless steel pipe 1 and thickening rings 11 from being corroded by acids, alkalis and other chemical substances. Guangna nano wear-resistant insulating anti-corrosion coating has good resistance to sediment abrasion, acid and alkali resistance, corrosion resistance and high temperature resistance. Through the mutual cooperation of passivation film 12, anti-corrosion layer 13 and anti-corrosion and wear-resistant layer 14, triple anti-corrosion protection can be carried out on seamless stainless steel pipe 1 and thickening rings 11. And benefiting from the good wear resistance of anti-corrosion and wear-resistant layer 14, wear protection can be carried out on passivation film 12 and anti-corrosion layer 13, thereby effectively extending the anti-corrosion performance.

[0021] Working principle: When two seamless stainless steel pipes 1 are butted, internal threads need to be opened on the inner wall of their ends, and external thread joints are used for screwing. The ends of seamless stainless steel pipe 1 are thickened by thickening rings 11, so as to prevent the cross-section of the end part from decreasing when threading the inside of the end of seamless stainless steel pipe 1, thereby improving the connection strength of the ends of two seamless stainless steel pipes 1. Perchloroethylene anti-corrosion paint can effectively prevent seamless stainless steel pipe 1 and thickening rings 11 from being corroded by acids, alkalis and other chemical substances. Guangna nano wear-resistant insulating anti-corrosion coating has good resistance to sediment abrasion, acid and alkali resistance, corrosion resistance and high temperature resistance. Through the mutual cooperation of passivation film 12, anti-corrosion layer 13 and anti-corrosion and wear-resistant layer 14, triple anti-corrosion protection can be carried out on seamless stainless steel pipe 1 and thickening rings 11. And benefiting from the good wear resistance of anti-corrosion and wear-resistant layer 14, wear protection can be carried out on passivation film 12 and anti-corrosion layer 13, thereby effectively extending the anti-corrosion performance.

Claims

1. A corrosion-resistant seamless stainless steel pipe for gasoline extraction, characterized in that, Including: A seamless stainless steel pipe (1), two groups of thickening rings (11) are uniformly arranged on the inner side wall of the seamless stainless steel pipe (1), and a passivation film (12) is covered on the inner and outer side walls of the seamless stainless steel pipe (1) and the thickening rings (11). An anticorrosive layer (13) is covered on the outside of the passivation film (12) on the outer side wall of the seamless stainless steel pipe (1) and the thickening rings (11), and an anticorrosive and wear-resistant layer (14) is covered on the outside of the anticorrosive layer (13).

2. The corrosion-resistant seamless stainless steel pipe for gasoline extraction according to claim 1, wherein: The seamless stainless steel pipe (1) and the thickening rings (11) are integrally formed, and the thickness of the thickening rings (11) is the same as that of the seamless stainless steel pipe (1).

3. A corrosion-resistant seamless stainless steel pipe for gasoline extraction according to claim 1, characterized in that: The two groups of thickening rings (11) are respectively located on the left and right sides of the inner side wall of the seamless stainless steel pipe (1), and the opposite sides of the two groups of thickening rings (11) are flush with the left and right sides of the seamless stainless steel pipe (1).

4. A corrosion-resistant seamless stainless steel pipe for gasoline extraction according to claim 1, characterized in that: The passivation film (12) is formed by passivating the seamless stainless steel pipe (1) and the thickening rings (11) with a passivation solution.

5. A corrosion-resistant seamless stainless steel pipe for gasoline extraction according to claim 1, characterized in that: The anticorrosive layer (13) is perchloroethylene anticorrosive paint.

6. A corrosion-resistant seamless stainless steel pipe for gasoline extraction according to claim 1, characterized in that: The anticorrosive and wear-resistant layer (14) is Guangna nano wear-resistant insulating anticorrosive coating.

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