Sealed ceramic lining composite oil tube and manufacturing method thereof

A composite oil pipe and ceramic lining technology, applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problems of poor sealing and corrosion resistance at the coupling, high manufacturing cost, and achieve the effect of reducing investment.

Inactive Publication Date: 2009-10-07
吉林省大多天盛金属陶瓷技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most gas wells use 13Cr tubing and couplings to seal the connection, and the manufacturing cost is relatively high. Although the performance and cost of ceramic-lined composite tubing are more suitable than 13Cr tubing, the sealing and corrosion resistance of the couplings are poor.

Method used

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  • Sealed ceramic lining composite oil tube and manufacturing method thereof
  • Sealed ceramic lining composite oil tube and manufacturing method thereof

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Experimental program
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Effect test

Embodiment Construction

[0019] refer to figure 1 , figure 2 , the present invention includes a ceramic-lined composite oil pipe 3, a coupling 1, a corrosion-resistant boronizing layer is provided on the inner and outer surfaces of the coupling, a flat groove is opened in the middle of the inner wall of the coupling, and a nitrile rubber sealing ring 2 is arranged in the flat groove. The rubber seal ring and the end face of the ceramic-lined composite oil pipe are tightly fitted and sealed. The two ends of the NBR seal ring are processed with trapezoidal grooves 4, and the inside is processed with grooves 5. In the groove of the end, the deformation of the nitrile rubber sealing ring is between 1.5-2.5mm, and the nitrile rubber squeezes the inner groove of the sealing ring close to the flat state, so as to achieve the sealing effect.

[0020] Concrete manufacturing method comprises the following steps:

[0021] 1. Grooving inside the coupling: use a lathe to process flat grooves at a position 46mm ...

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Abstract

A sealed ceramic lining composite oil tube comprises a ceramic lining composite oil tube and a coupling. The invention is characterized in that the external surface in the coupling is installed with a corrosion-resistant boronized layer. The middle part of inner wall of coupling is provided with a groove. An acrylonitrile-butadiene rubber ring is provided in the groove. The acrylonitrile-butadiene rubber ring and the end plane of ceramic lining composite oil tube is closely matched and hermetically sealed. The manufacturing method of the invention comprises the following steps: grooving at the inner part of coupling, cleaning the surface of coupling, boronizing the cleaned grooved coupling, cleaning the boronized coupling, assembling the cleaned boronized coupling and the acrylonitrile-butadiene rubber ring, plating copper on the screw cap of ceramic lining composite oil tube, and assembling the boronized coupling and the ceramic lining composite oil tube. The invention causes that the air tightness and corrosion resistance at the coupling obtain the level of 13Cr stainless steel coupling which is commonly used by prior gas well for replacing the 13Cr stainless steel coupling and reducing the investment of oil tube used in gas well.

Description

technical field [0001] The invention belongs to the technical field of oilfield gas recovery, and relates to a ceramic-lined composite oil pipe with good corrosion resistance and good sealing performance and a manufacturing method. Background technique [0002] The thread sealing performance between the oil extraction pipe and the coupling is an important element affecting the gas production process, and the oil pipe coupling is an important structural part used to connect the oil extraction pipe in the gas production machinery. At present, most gas wells use 13Cr tubing and couplings to seal the connection, and the manufacturing cost is relatively high. Although the performance and cost of ceramic-lined composite tubing are more suitable than 13Cr tubing, the sealing and corrosion resistance of the couplings are poor. Utility model content [0003] The object of the present invention is to provide a ceramic-lined composite oil pipe with low manufacturing cost, corrosion r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/147F16L58/10F16L21/02
Inventor 杨永利孙世杰李振杰安健
Owner 吉林省大多天盛金属陶瓷技术有限公司
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