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Oil casing pipe coupling composite surface layer and treating method

A composite surface and treatment method technology, applied in the field of oil-casing joint composition and its coating treatment, can solve problems such as environmental protection and environmental pollution, and achieve industrial implementation, high bonding strength, and easy operation Effect

Active Publication Date: 2013-07-31
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

[0018] 45% polyamideimide (PAI), 12% modified molybdenum disulfide {10% molybdenum disulfide (MoS 2 ), 1.5% γ-aminopropyl triethoxysilane, 0.5% fatty alcohol polyoxyethylene ether (Pingpingjia), this ratio is the percentage of the total mass of the final organic bonding solid lubricating coating, the same below}, 5 % Melamine Cyanurate (MCA), 38% Water. PAI is a water-soluble suspension (20% solid content), the same below.

[0019] Coating process: the pressure of the spray gun is 0.25MPa, and the temperature is kept at 70°C for 0.5 hours in a drying oven, and then raised to 380°C for 1 hour.

[0020] Results: After the above treatment, the bonding strength between the coating and the P110 steel grade was grade 1. It shows that the anti-sticking performance is excellent.

Embodiment 2

[0022] 20% polyamideimide (PAI), 8.2% modified molybdenum disulfide (MoS 2 ), {7% molybdenum disulfide (MoS 2 ), 1% γ-aminopropyl triethoxysilane, 0.2% fatty alcohol polyoxyethylene ether (Pingpingjia)}, 2.5% melamine cyanurate (MCA), 69.3% water.

[0023] Coating process: the pressure of the spray gun is 0.25MPa, and the temperature is kept at 80°C for 1 hour in a drying oven, and then raised to 300°C for 1 hour.

[0024] Results: After the above treatment, the bonding strength between the coating and the P110 steel grade was grade 1.

Embodiment 3

[0026] 30% polyamideimide (PAI), 34% modified molybdenum disulfide (MoS 2 ), {25% molybdenum disulfide (MoS 2 ), 5% γ-aminopropyl triethoxysilane, 4% fatty alcohol polyoxyethylene ether (Pingpingjia)}, 10% melamine cyanurate (MCA), 26% water.

[0027] Coating process: The spray gun pressure is 0.25MPa, and the temperature is kept at 50°C for 1 hour in a drying oven, and then raised to 350°C for 1 hour.

[0028] Results: After the above treatment, the bonding strength between the coating and the P110 steel grade was grade 1.

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Abstract

The invention provides an oil casing pipe coupling composite surface layer which comprises a phosphate chemical conversion coating layer directly contacted with the oil casing pipe, as well as an organic bonding solid lubrication coating which is coated on the phosphate chemical conversion coating layer, wherein the coating comprises 20%-45% of PAI Polyamide-imide, 5%-35% of modified molybdenum disulfide, 2%-10% of melamine cyanurate and water. The treating method comprises the steps that after the components are mixed sufficiently and uniformly, the components are sprayed on the phosphate chemical conversion coating layer on the thread surface of an oil casing pipe coupling; all components are placed in a heating device, and heated to the temperature ranging from 50 DEG C to 80 DEG C, and heat preservation is performed for 0.2-1 hour; and then the components are heated to the temperature ranging from 300 DEG C to 380 DEG C, and the heat preservation is performed for 0.5-1hour. According to the oil casing pipe coupling composite surface layer provided by the invention, bumps and spaces of the phosphate chemical conversion coating layer can enhance the bonding strength between the solid lubrication coating and a matrix; and the treating method can control the bonding strength of the coating conveniently, the technology is simple, and the industrialized implementation is facilitated.

Description

technical field [0001] The invention relates to a composition, in particular to a composition for oil casing joints and a coating treatment method thereof. 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-up and breakout, and to meet environmental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/02C09D179/08C09D7/12B32B33/00
Inventor 王琍
Owner BAOSHAN IRON & STEEL CO LTD
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