Mechanical tube cleaner

A pig and mechanical technology, applied in the direction of cleaning hollow objects, cleaning methods and utensils, chemical instruments and methods, etc., can solve problems such as poor sealing of pigging balls and inner walls of pipelines

Inactive Publication Date: 2018-12-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a mechanical pig, which aims to solve the problem of the poor seal between the pigging ball and the inner wall of the pipeline from the essence of the seal, and also avoids the damage caused by the rupture of the pigging ball during the interference operation. risk, for low and ultra-low flow, efficient condensate push and pigging operations

Method used

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Experimental program
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Embodiment 1

[0034] For a 14-inch pipeline in a gas field in the South China Sea, in the previous pigging operation, when the low flow rate reached 6.57MMSCFD, the experience of sending 2% and 3% interference balls (cracked when taken out) was experienced.

[0035] Calculation results of the pigging ball for injecting triethylene glycol liquid:

[0036] Table 1-1 Basic data

[0037]

project

value

pipeline

the inside diameter of

337mm

[0038] Table 1-2 Contact strip width

[0039]

[0040] The a and L lengths are calculated by the formula, and they are 68.4mm and 84.4mm at 2% and 3% interference respectively.

[0041] Therefore, the 14-inch pipeline for a certain gas field in the South China Sea can be determined, and the length of the new pig L can be selected between 68.4mm and 84.4mm, which has practical significance. The L length calculated by the formula has better sealing performance, and it is advisable to consider the pipeline passability ...

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Abstract

The invention discloses a mechanical tube cleaner. The mechanical tube cleaner consists of three portions which are a hollow left hemisphere, an annular hollow cylinder and a hollow right hemisphere respectively; and the left hemisphere and the right hemisphere are separately connected to the two ends of the annular hollow cylinder to form an integrated structure. The tube cleaner mainly changes the sealing mode of the original tube cleaning ball and the inner wall of a seabed tube, circumferential linear sealing is designed into annular belt shaped surface sealing, by the belt shaped surfacesealing, a bypass circumstance generated in a running process due to the fact that upstream and downstream circumferential linear sealing of an imported M-brand tube cleaning ball is poor is avoided,the pressure difference between upstream and downstream is maintained, and can also be maintained even if the flow is ultra-low, and thus, the tube cleaning ball can keep moving forwards by driving force generated by the pressure difference; and when the tube cleaner has ultra-low flow, the upstream and the downstream are sealed effectively, and normal tube cleaning operation and gas condensate pushing operation are realized.

Description

technical field [0001] The invention relates to the technical field of submarine pipelines for pushing condensate oil and pigging equipment, in particular to a mechanical pig. Background technique [0002] Mechanical pigging balls have been widely used in subsea pipelines for multi-phase mixed transportation of natural gas and condensate oil. However, under the conditions of established pipelines, as the gas field development enters the final stage, the production of condensate oil and natural gas has dropped sharply , the original Maloney brand pigging ball imported from abroad is no longer applicable. Under the condition of low output volume, especially when the external output volume is ultra-low, the driving force of the pigging ball in the submarine pipeline is insufficient, and the bypass effect is significantly affected and stagnation Regardless of the previous problems, the accumulated liquid volume of the sea pipe gradually increases with time, and the more liquid a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/04
CPCB08B9/04B08B2209/04
Inventor 崔攀
Owner CHINA NAT OFFSHORE OIL CORP
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