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Oil and gas pipeline plugging method

A technology for oil and gas pipelines and oil walls, applied in pipeline protection, pipeline heating/cooling, and pipeline protection through heat insulation, etc., can solve the problems of pipeline coldness and brittleness, lower the freezing point, and increase the energy consumption of freezing, so as to improve the pressure bearing capacity, energy saving, and sealing effect

Pending Publication Date: 2021-07-16
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The addition of solid water emulsifier to emulsified water will reduce the freezing point of water, which will not only increase the energy consumption of freezing, but also easily cause cold and brittle pipelines

Method used

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  • Oil and gas pipeline plugging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Mix the water-absorbing resin and water at a mass ratio of 1:100 to make a freezing medium, and fill it into an acrylic tube with a diameter of 4cm. Since the tube is thin, no butter wall is used to shape it, but the collapse at both ends is obvious. Therefore, the filling is longer and consumes more freezing medium. Put the acrylic tube filled with the freezing medium into the refrigerator to freeze, and it has good sealing properties. It is measured that the pressure of the freezing medium is greater than 0.5MPa, and a good sealing effect is achieved.

Embodiment 2

[0059] Mix water-absorbent resin and water at a mass ratio of 1:100 to make a freezing medium, and fill it into a metal pipe with a diameter of 8 cm. In the initial operation, the butter wall was not used to set the shape. It was found that the freezing medium fell down due to its own gravity and could not fill the entire pipe diameter. Therefore, the first butter wall and the second butter wall were used to set the shape of the freezing medium, and the butter wall filled the entire pipe diameter with the freezing medium , Two sections of butter wall with a thickness of 4cm and a section of freezing medium with a thickness of 4cm are shaped in the middle of the two sections. After freezing in the refrigerator, the measured pressure is greater than 1.0MPa, achieving a good sealing effect.

Embodiment 3

[0061] In the target oil and gas pipeline with a diameter of 20cm, first put a 10cm thick first butter wall at a distance of 40cm from the nozzle, and then put the freezing medium formed by immersing 40g of water-absorbing resin (50 mesh) into 4000g of water into the target oil and gas pipeline, and use 5cm The thick second wall of butter squeezes the freezing medium against the top of the target oil and gas pipeline. Among them, the outer wall of the target oil and gas pipeline is provided with a refrigerated circulation pipeline and a 5 cm thick insulation layer. The refrigeration equipment is turned on, and the circulating refrigerated liquid (water and ethylene glycol with a mass ratio of 1:1) freezes the refrigerated medium to expand and seal The target oil and gas pipeline has been measured to have a pressure greater than 1.0MPa, achieving a good plugging effect.

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Abstract

The invention discloses an oil and gas pipeline plugging method, and belongs to the technical field of pipeline plugging. The method comprises the steps that a first grease wall, a freezing medium and a second grease wall are sequentially placed into a set position in a target oil and gas pipeline in sequence; and the target oil and gas pipeline is locally cooled, so that the freezing medium is frozen, and oil and gas pipeline plugging is achieved. The freezing medium is extruded by the first grease wall and the second grease wall so as to make close contact with the top wall and the bottom wall of the target oil and gas pipeline; and the freezing medium is prepared by absorbing water by using water-absorbent resin. The freezing medium is the water-absorbent resin after water absorption, a condensation point is high, and cold brittleness damage to the target oil and gas pipeline cannot be caused. The grease wall is adopted to extrude and compact the freezing medium, so that the freezing medium can make close contact with the inner wall of the target oil and gas pipeline conveniently, and the freezing medium can be subjected to heat preservation.

Description

technical field [0001] The invention relates to the technical field of pipeline plugging, in particular to an oil and gas pipeline sealing method. Background technique [0002] When oil and gas pipelines are being maintained and repaired, the oil and gas in the pipeline must be blocked and isolated to prevent flammable and explosive oil and gas from igniting or exploding. Freezing plugging technology is often used in the plugging of oil and gas pipelines for oil and gas transportation. By injecting refrigerated medium into the pipeline, the temperature is cooled locally outside the pipeline to make it condense, so as to achieve the purpose of sealing the pipeline. [0003] The currently commonly used freezing medium is a solid water emulsifier, which can solidify under freezing conditions to achieve plugging, and quickly recovers its original creamy state under thawing conditions, and has good quality and tightness. [0004] In the process of realizing the present invention...

Claims

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Application Information

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IPC IPC(8): F16L53/70F16L59/02
CPCF16L53/70F16L59/029
Inventor 惠文颖牛健壮吴锦强张晓云谭兴赵康惠文彬
Owner PETROCHINA CO LTD
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