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Cleaner for coating corrosion inhibitor on pipeline

A technology of corrosion inhibitor and cleaner, applied in pipeline protection, pipeline anti-corrosion/anti-rust protection, coating and other directions, can solve the problem of not being able to ensure sufficient coating, and achieve the effect of being conducive to blockage, reducing chemical waste, and reasonably controlling

Active Publication Date: 2015-02-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has been widely accepted and applied, it cannot guarantee that the parts above the liquid level of the corrosion inhibitor in the pipeline can be fully coated

Method used

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  • Cleaner for coating corrosion inhibitor on pipeline
  • Cleaner for coating corrosion inhibitor on pipeline
  • Cleaner for coating corrosion inhibitor on pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In order to overcome that the continuous injection method and the intermittent injection method of the corrosion inhibitor in the prior art cannot be evenly coated on the pipeline wall in all directions, this embodiment provides a method such as figure 1 , figure 2 , image 3 and Figure 4 The pipeline corrosion inhibitor coating cleaner shown includes a framework 1, and sealing discs 5 and leather cups 6 arranged on the front and rear ends of the framework 1. The framework 1 is cylindrical with two ends open, and the framework 1 1. The front end of the sealing plate 5 is provided with a liquid introduction end 4, and the rear end of the liquid introduction end 4 is provided with a cylindrical extension section 14, and the cylindrical extension section 14 is fixed inside the front end of the skeleton 1. The liquid introduction end 4 The front end is provided with an adjustable spray nozzle 3, and the front end of the adjustable spray nozzle 3 is provided with a guide...

Embodiment 2

[0037] On the basis of Embodiment 1, the bottom of the skeleton 1 is fixed with a counterweight 10, and the counterweight 10 is generally selected from metal or other materials with sufficient weight to keep the pipeline corrosion inhibitor coated cleaner relatively in the process of advancing. The axial direction of gravity does not produce rotation to ensure the suction of corrosion inhibitors.

[0038] The cylindrical extension section 14 is provided with a plurality of barbs 7, which are fixedly connected to the inner surface of the frame 1; the liquid introduction end 4 made of elastic material is safely fixed on the front end of the frame 1 through the columnar extension section 14, and the column A plurality of barbs 7 on the shaped extension section 14 make the outer surface of the liquid introduction end 4 and the inner surface of the skeleton 1 tightly grasped, ensuring that the liquid introduction end 4 can be fastened on the skeleton 1, and the cylindrical extension...

Embodiment 3

[0043] In the process of corrosion inhibitor coating, if the injection amount of corrosion inhibitor is too large, it will not only cause the waste of corrosion inhibitor, but also cause the blockage of pipeline equipment; if the injection amount of corrosion inhibitor is too small, it will not be able to form Complete protective film, so it is necessary to determine the reasonable filling amount of corrosion inhibitor.

[0044] The formula for calculating the injection volume of the sustained-release agent is:

[0045] (1)

[0046] (2)

[0047] formula: K As an additional factor, generally take 1.15; Q is the injection amount of corrosion inhibitor; D 1 is the inner diameter of the pipe; H is the thickness of the corrosion inhibitor film; L is the total length of the pipe; Q 1 is the volume of the tee and sewage outlet of the upper branch of the pipeline; D 2 is the inner diameter of the branch pipe; L 2 is t...

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Abstract

The invention provides a cleaner for coating a corrosion inhibitor on a pipeline. The cleaner comprises a framework, a sealing disc and a packing cup, wherein the sealing disc and the packing cup are arranged at the front end and the back end of the framework respectively; a liquid guide end is arranged at the front of the sealing disc in the front of the framework, a columnar extension section is arranged at the back end of the liquid guide end, the columnar extension section is fixed inside the front end of the framework, and an adjustable jet nozzle and a guider are arranged at the front end of the liquid guide end; a siphon passage and an annular air flow passage are embedded in the liquid guide end, one end of the siphon passage and one end of the annular air flow passage can be both communicated with the adjustable jet nozzle, and an opening in the other end of the siphon passage faces towards the bottom of the inner wall of the pipeline; a Venturi tube is arranged inside the columnar extension section, the back end of the Venturi tube is communicated with an air storage chamber inside the framework, and the front end of the Venturi tube is communicated with the other end of the annular air flow passage through a porous plate; an air inlet pipe is embedded in the packing cup at the back end of the framework, one end of the air inlet pipe is communicated with the air storage chamber inside the framework, and the other end of the air inlet pipe is communicated with the pipeline. The cleaner can comprehensively coat the corrosion inhibitor on the inner wall of the pipeline.

Description

technical field [0001] The invention belongs to the technical field of pipeline pigs, and in particular relates to a pipeline corrosion inhibitor coating cleaner. Background technique [0002] H is generally contained in the produced gas of oil and gas fields 2 S, CO 2 Such corrosive gases, coupled with the precipitation of water and the existence of oxygen during the transportation process, make the transportation medium mostly in the gas-liquid two-phase flow pattern, which causes serious corrosion damage to the pipeline facilities. In order to prevent and control the occurrence of corrosion, it is often used A method of continuously or periodically adding corrosion inhibitors to gas pipelines. [0003] There are two commonly used continuous injection methods at present, one is "injection type", that is, the corrosion inhibitor solution is flowed into the pipeline by using a balance tank, and the corrosion inhibitor is taken away by the air velocity. Although the metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L58/02B05C7/02
CPCB05C7/02F16L58/02
Inventor 张振云李琼玮奚运涛程碧海李慧付彩利宋丽丽孙雨来杨会丽
Owner PETROCHINA CO LTD
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