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A kind of anti-corrosion technology of sticking anode inside the high corrosion section under the oil pump

A technology of oil well pump and anode, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc. It can solve problems such as the solution to the oil pipe that has not been mentioned, achieve rich anti-corrosion technical means, avoid the risk of pipe sticking, and realize the conductive connection Effect

Active Publication Date: 2022-08-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, none of the above technologies mentions the solution to the anode sticking caused by the tubing

Method used

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  • A kind of anti-corrosion technology of sticking anode inside the high corrosion section under the oil pump
  • A kind of anti-corrosion technology of sticking anode inside the high corrosion section under the oil pump
  • A kind of anti-corrosion technology of sticking anode inside the high corrosion section under the oil pump

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Effect test

no. 1 approach

[0051] The first embodiment of the present invention relates to an anti-corrosion process for sticking anodes in a high-corrosion section under an oil pump, including the following steps:

[0052] Step 1. Select the target well to be anticorrosion and pass the well;

[0053] Step 2. Fill the target well with sand to the first preset position;

[0054] Step 3. Take the anode tube and coat the outer tube wall of the anode tube with conductive adhesive;

[0055] Step 4. Using the tubing to lower the anode tube to the second preset position in the target well;

[0056] Step 5. Rinse the well with clean water in positive circulation, take another conductive adhesive and pump it into the oil pipe to replace the conductive adhesive to the top of the anode tube, and then excessively replace the conductive adhesive so that the conductive adhesive is located in the annular space between the anode tube and the casing;

[0057] Step 6. Shut in the well;

[0058] Step 7. Discard the ano...

no. 2 approach

[0065] The present embodiment relates to the anti-corrosion process of sticking anodes in the high corrosion section under the oil well pump, including the following steps:

[0066] Step 1. Select the target well to be anticorrosion and pass the well;

[0067] Step 2. Fill the target well with sand to the first preset position;

[0068] Step 3. Take the anode tube and coat the outer tube wall of the anode tube with a conductive adhesive with a coating thickness of 3 to 5 mm;

[0069] Step 4. Using the tubing to lower the anode tube to the second preset position in the target well;

[0070] Step 5. Rinse the well with clean water in positive circulation, take another conductive adhesive and pump it into the oil pipe to replace the conductive adhesive to the top of the anode tube, and then excessively replace the conductive adhesive so that the conductive adhesive is located in the annular space between the anode tube and the casing, like figure 2 shown, including:

[0071]...

no. 3 approach

[0093] According to the anti-corrosion process of sticking anodes in the high-corrosion section under the oil pump provided by the second embodiment, the anti-corrosion of Zhen X well is implemented:

[0094] The oil pump of the well is 350m above the perforation section, and 7 anode tubes are run at a distance of 50m;

[0095] Anode tube size: outer diameter 112mm, inner diameter 98mm, length 5m, the molding process is casting.

[0096] The current efficiency of the anode tube measured indoors is 40%.

[0097] Resin binder: 100 parts E40 epoxy resin, 10 parts m-phenylenediamine, 17 parts liquid nitrile-40, 1 part resorcinol, 20 parts silver powder, 3 parts acetylene carbon black (purity 99%), liquid 1 part of nitrile rubber and 50 parts of aluminum powder, each component is added to the reaction vessel according to the above proportions, heated and stirred evenly to obtain a resin adhesive.

[0098] The shear strength of solidified bonded steel pipe and aluminum alloy is 15...

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Abstract

The invention provides an anti-corrosion process for sticking an anode inside a high-corrosion section under an oil pump, comprising the following steps: lowering the internal anti-corrosion anode into a design position through downhole pipe string operation, fixing it by resin coating and extrusion coating, The column is inverted and pulled out of the pipe string, and the corresponding anti-corrosion anodes are designed in sequence, and then the production pipe string is lowered into the production string to resume production. The anti-corrosion process protects the inner wall of the casing through the internal anti-corrosion of the anode, and achieves the effect of prolonging the life of the oil well; the anode is attached to the casing, especially in the area where the corrosion is severe under the pump, which enriches the anti-corrosion technology in the casing in the oil field and avoids deep downholes. The risk of sticking caused by entering too many oil pipes into the anode; realizing the technical means of quickly attaching multiple anodes, and realizing the firmness of the anode tube through coating and squeezing; using conductive resin adhesive , which not only achieves the purpose of bonding the anode tube and the casing, but also realizes the conductive connection between the active metal anode and the casing.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and particularly relates to an anti-corrosion process for sticking anodes in a high-corrosion section under an oil pump. Background technique [0002] Oilfield production is faced with serious casing corrosion problems. The external corrosion protection of casing is usually solved by technical means such as epoxy coating and cathodic protection. However, for internal casing corrosion, the more mature technology is only the addition of corrosion inhibitors. The technical means are relatively simple. [0003] Recently, the anode is brought into the tubing to prevent corrosion in the casing, the sacrificial anode is insulated from the tubing, and the metal contact wall is in contact with the inner wall of the casing to transmit current to protect the inner wall of the casing. The severely corroded section of the casing is located near the perforation section of the Jurassic oil well and at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B41/02C23F13/06
CPCE21B41/02C23F13/06
Inventor 郭钢慕立俊李琼玮谷成义孙雨来杨立华苑慧莹卢文伟付彩利程碧海
Owner PETROCHINA CO LTD
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