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Anti-galling coating for oil sleeve joint and coating method thereof

A technology for oil casing and coating, applied in casing, coating, drill pipe, etc., can solve the problems of environmental pollution, can not meet environmental protection and other problems, and achieve high bonding strength, convenient anti-galling performance, and convenient bonding strength. Effect

Active Publication Date: 2013-12-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thread grease contains heavy metal powders mainly lead and zinc. These heavy metal powders will cause serious pollution to the environment and cannot meet the requirements of environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Coating composition (weight percentage content): 5% polyphenylene sulfide (2.5μm), 20% polytetrafluoroethylene (<0.2μm), 5% molybdenum disulfide (0.05μm), 1% polyvinylpyrrolidone (2.5μm) , 1% octylphenyl polyoxyethylene ether, 68% water.

[0021] Coating process: The pressure of the spray gun is 0.25MPa, spray on the threaded surface of the oil-casing joint, keep it in a drying oven at 80°C for 0.2 hours, and then raise it to 380°C for 0.5 hours.

[0022] Results: After the above treatment, the bonding strength between the coating and the P110 steel grade was grade 1.

Embodiment 2

[0024] Coating composition (weight percentage content): 7% polyphenylene sulfide (2.5μm), 24% polytetrafluoroethylene (<0.2μm), 6% molybdenum disulfide (0.05μm), 1.5% polyvinylpyrrolidone (2.5μm) , 1% octylphenyl polyoxyethylene ether, 60.5% water.

[0025] Coating process: The pressure of the spray gun is 0.25MPa, spray on the threaded surface of the oil-casing joint, keep it in a drying oven at 80°C for 0.2 hours, and then raise it to 370°C for 1 hour.

[0026] Results: After the above treatment, the bonding strength between the coating and L80-13Cr steel grade is grade 1.

Embodiment 3

[0028] Coating composition (weight percentage content): 20% polyphenylene sulfide (2.5μm), 40% polytetrafluoroethylene (<0.2μm), 2% molybdenum disulfide (0.02μm), 1% polyvinylpyrrolidone (2.5μm) , 1% octylphenyl polyoxyethylene ether, 36% water.

[0029] Coating process: The pressure of the spray gun is 0.25MPa, spray on the threaded surface of the oil-casing joint, keep it in a drying oven at 50°C for 1 hour, and then raise it to 350°C for 1.5 hours.

[0030] Results: After the above treatment, the bonding strength between the coating and the P110 steel grade was grade 1.

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PUM

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Abstract

The invention relates to the technical field of oil sleeve joint surface treatment, and discloses an anti-galling coating for an oil sleeve joint. The coating is a composition, and comprises the following components in percentage by weight: 5 to 20 percent of polyphenylene sulfide, 10 to 40 percent of polytetrafluoroethylene, 2 to 15 percent of molybdenum disulfide, 1 to 10 percent of polyvinylpyrrolidone, 1 to 10 percent of octyl phenyl polyoxyethylene ether, and the balance of water, wherein the polyphenylene sulfide, the polytetrafluoroethylene, the molybdenum disulfide and the polyvinylpyrrolidone are powdery particles with the particle size of 0.01-5mu m; and the octyl phenyl polyoxyethylene ether is liquid. By the anti-galling coating and the coating method thereof, the bonding strength and anti-galling property of the coating can be convenient to control, and the coating process is simple, easy to operate and suitable industrial implementation.

Description

technical field [0001] The invention relates to the technical field of surface treatment of oil-casing joints, in particular to an anti-stick coating for oil-casing joints and a coating method. Background technique [0002] Oil and gas exploration and development must use oil and casing products. The casing is threaded to form a casing string to form an oil and gas recovery channel, and the oil pipe is threaded to form a tubing string for oil and gas recovery. It is one of the important performance indicators that the repeated make-up and break-out of the oil casing joint does not cause sticking. Apply thread compound to ensure that no adhesive failure occurs at the joint connection. However, thread grease contains heavy metal powders mainly lead and zinc, which will cause serious pollution to the environment and cannot meet the requirements of environmental protection. In the use of oil and casing products, it is necessary to ensure the non-stick performance of make-u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/18E21B17/08
Inventor 王琍
Owner BAOSHAN IRON & STEEL CO LTD