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Repair method of old pipe used in water injection well

A repair method and technology for water injection wells, which are used in earth-moving drilling, wellbore/well components, etc., can solve the problems of difficulty in removing rust, reduced economic and social benefits, and high costs, and achieve the effect of saving purchase costs.

Inactive Publication Date: 2016-08-17
ZIBO HONGYANG PETROLEUM EQUIP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is often very difficult to remove rust by mechanical means, the cost is high, and its economic and social benefits will be reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiments 1 to 4 are specific implementations of the method for repairing old pipes used in water injection wells of the present invention, wherein embodiment 1 is the best embodiment.

[0023] Example 1

[0024] The steps in this embodiment include flaw detection, sorting, primary cutting and descaling, heating, cooling, secondary cutting and descaling, and head cutting;

[0025] Flaw detection: use the magnetic flux leakage flaw detector to inspect the old oil pipe three times, and set the defect depth to 3.5mm, 2.7 mm, and 1.6mm respectively; when the defect depth of the magnetic flux leakage flaw detector is set to 3.5mm, all old oil pipes In the first inspection, the old oil pipes with a defect depth greater than 3.5 mm are used as waste pipes; the defect depth of the magnetic flux leakage flaw detector is set to 2.7 mm, and the old oil pipes with a defect depth of ≤ 3.5 mm measured in the previous step are used as waste pipes. The magnetic flux leakage flaw det...

Embodiment 2

[0032] The steps in this embodiment include flaw detection, sorting, primary cutting and descaling, heating, cooling, secondary cutting and descaling, and head cutting;

[0033] Flaw detection: use the magnetic flux leakage flaw detector to inspect the old oil pipe three times, and set the defect depth to 3.5mm, 2.7 mm, and 1.6mm respectively; when the defect depth of the magnetic flux leakage flaw detector is set to 3.5mm, all old oil pipes In the first inspection, the old oil pipes with a defect depth greater than 3.5 mm are used as waste pipes; the defect depth of the magnetic flux leakage flaw detector is set to 2.7 mm, and the old oil pipes with a defect depth of ≤ 3.5 mm measured in the previous step are used as waste pipes. The magnetic flux leakage flaw detector with a defect depth of ≤2.7 mm conducts the second inspection, and obtains old oil pipes with a defect depth of 2.7mm<≤3.5mm and old oil pipes with a defect depth of ≤2.7mm; set the defect depth of the magnetic ...

Embodiment 3

[0040] The steps in this embodiment include flaw detection, sorting, primary cutting and descaling, heating, cooling, secondary cutting and descaling, and head cutting;

[0041] Take the following steps:

[0042] Flaw detection: use the magnetic flux leakage flaw detector to inspect the old oil pipe three times, and set the defect depth to 3.5mm, 2.7 mm, and 1.6mm respectively; when the defect depth of the magnetic flux leakage flaw detector is set to 3.5mm, all old oil pipes In the first inspection, the old oil pipes with a defect depth greater than 3.5 mm are used as waste pipes; the defect depth of the magnetic flux leakage flaw detector is set to 2.7 mm, and the old oil pipes with a defect depth of ≤ 3.5 mm measured in the previous step are used as waste pipes. The magnetic flux leakage flaw detector with a defect depth of ≤2.7 mm conducts the second inspection, and obtains old oil pipes with a defect depth of 2.7mm<≤3.5mm and old oil pipes with a defect depth of ≤2.7mm; s...

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Abstract

The invention discloses a method for repairing old pipes for a water injection well, and belongs to the technical field of oil pipe columns used for water injection wells. According to the method, a flaw detection method, a separation method, a primary cutting and descaling method, a heating method, a cooling method, a secondary cutting and descaling method and a head cutting method are adopted for repairing and reusing waste metal pipes of an oil field. A flaw detection machine is used for performing flaw detection, separation and grading on the pipes in the flaw detection and separation process; in the whole descaling process, remaining scale is removed through the primary cutting and descaling, the heating, the cooling and the secondary cutting and descaling, the descaling speed is high, and the scale is removed thoroughly. The processed metal pipes obtained with the method can be reused according to different graded application depth conditions, the perforation damage phenomenon does not happen within three to six months, reuse of waste oil pipes is achieved, and waste is turned into wealth.

Description

technical field [0001] The invention discloses a method for repairing old pipes for water injection wells, belonging to the technical field of oil pipe strings for water injection wells. Background technique [0002] Water injection oil recovery is a commonly used technology in oilfields. Its usage is to change some oil wells with low liquid production in a certain area into water injection wells. The tubing of this type of well is called "water injection well tubing". Water injection wells are often neglected for maintenance and maintenance because they are used for water injection, and some are left underground because the crude oil in the area is depleted and abandoned. On the one hand, this causes a waste of resources, and on the other hand, it also pollutes groundwater sources. Repairing and recycling such oil pipes can produce good social benefits, and at the same time bring good economic benefits to enterprises. [0003] Due to the long-term neglect of maintenance,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCE21B29/10
Inventor 高环傅云水孙兆社周振国孙步春
Owner ZIBO HONGYANG PETROLEUM EQUIP GRP
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