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Petroleum pipe protective coating and its preparation method

A technology for protective coatings and oil pipes, applied in coatings and other directions, can solve the problems of reduced comprehensive performance reliability and limited use range, and achieve the effects of excellent mechanical properties, improved compactness, and good chemical corrosion resistance.

Active Publication Date: 2008-08-27
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature is higher than 140 ° C, the reliability of its comprehensive performance is reduced, and the scope of use is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Protective paint of the present invention is made up of following raw material by weight percentage:

[0078] Polyphenylene sulfide (PPS) 65%

[0079] Chromium trioxide (Cr 2 o 3 ) 5%

[0080] Titanium dioxide (TiO 2 ) 15%

[0081] Silicon carbide (SiC) 14%

[0082] Silane 1%

[0083] The above-mentioned materials are all micron-scale materials.

[0084] Main applications: high hardness, high wear resistance, smooth surface, no pinholes, used for inner coating of drill pipe, high production gas well tubing inner coating.

[0085] The preparation method of present embodiment protective paint is:

[0086] (1) Put polyphenylene sulfide powder, the above-mentioned reinforcing agent and ethanol 5 times the weight of polyphenylene sulfide into a ball mill for ball milling.

[0087] (2) Ceramic balls are used for ball milling, and the ball milling time is 12 hours.

[0088] (3) Sieve, the powder particle size is less than 0.096mm, and prepare the suspension of protec...

Embodiment 2

[0107] The protective paint of present embodiment 2 is made up of following components by weight percentage:

[0108] Polyphenylene sulfide (PPS) 80%

[0109] Cobalt trioxide (nano-scale) 5%

[0110] Titanium dioxide (nano-scale) 10%

[0111] Aluminum oxide (nanoscale) 5%.

[0112] Main application: high wear resistance, smooth surface, no pinholes, used for the inner coating of downhole oil pipes and delivery pipes in harsh environments (containing hydrogen sulfide).

[0113] The construction method of the protective coating in this embodiment 2 adopts the electrostatic powder spraying process, and the powder preparation process is according to the method of embodiment 1, the suspension that has been ball milled is put into an oven, baked at 110 ° C for 6 hours and sieved to control the powder The direct current of particles is less than 0.074mm. This method is a coating method in which the powder is adsorbed to the surface of the workpiece by using the induction effect o...

Embodiment 3

[0121] Present embodiment 3 protective coatings are made up of following raw material by weight percentage:

[0122] Polyphenylene sulfide (PPS) 60%

[0123] Fluorine tetrahexa(F 46 ) 10%

[0124] Chromium trioxide (Cr 2 o 3 ) 5%

[0125] Titanium dioxide (TiO 2 ) 15%

[0126] Silicon carbide (SiC) 10%

[0127] The above-mentioned materials are all micron-scale materials.

[0128] Main application: high hardness, high wear resistance, preventing waxing and scaling of petroleum pipes, used for inner coating of downhole oil pipes and delivery pipes in harsh environments.

[0129] The preparation method and construction method of the present embodiment 3 protective coatings are the same as in embodiment 1.

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Abstract

The invention discloses protective coating for oil pipeline and down-hole equipment in drilling, oil extraction and transportation, which comprises as weight percent: 55~95% polyphenylene sulfide, 3~30% reinforcing agent for adhesive force, 1~20% corrosion resisting reinforcing agent, and 1~15% surface wetting conversion agent. The product can prevent or decrease the erosion, corrosion, and blockage from strong corrosive impurity with high temperature, pressure, hydrogen sulfide content, decreases cost, increases pipeline synthesis performance and service life. it also provides the opposite preparation method.

Description

Technical field: [0001] The invention relates to a protective coating for oil pipes, wellheads and downhole equipment used in oil and gas drilling, oil production and transportation, and a preparation method thereof. Background technique: [0002] Oil pipe includes drill pipe, oil pipe, casing, oil and gas transmission pipe and sucker rod. Downhole and wellhead equipment includes wellhead high pressure control system, station equipment, downhole pump and packer, etc. The working environment of oil pipes, wellheads and downhole equipment is very harsh (for example, the temperature of oil and gas wells may be as high as 180°C, the pressure may be as high as 100MPa, and there are strong corrosive media such as high hydrogen sulfide and carbon dioxide, and high chloride content). It has seriously affected the exploration and development and the operating benefits of oil and gas fields. For sour gas fields, it may also cause environmental problems and major safety accidents. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D181/02F16L58/10
Inventor 施太和杨蝉聪张智曾清泉何更生张天健张列平陈良浩冯少波王明远张远银赵来宝陈静霞过一洲沙振中
Owner SOUTHWEST PETROLEUM UNIV