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Anti-corrosion process for internally-pasted anode of high-corrosion section under oil well pump

A technology for oil well pumps and anodes, which is applied in wellbore/well parts, earthwork drilling and production, etc. It can solve problems such as the solution to oil pipes that have not been mentioned, achieve rich anti-corrosion technical means, realize conductive connection, and avoid the risk of stuck pipe Effect

Active Publication Date: 2020-11-17
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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  • Anti-corrosion process for internally-pasted anode of high-corrosion section under oil well pump
  • Anti-corrosion process for internally-pasted anode of high-corrosion section under oil well pump
  • Anti-corrosion process for internally-pasted anode of high-corrosion section under oil well 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 displace the conductive adhesive to the top of the anode tube, and then replace excessively 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 anode tube and remove the ...

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 an internally-pasted anode of a high-corrosion section under an oil well pump. The anti-corrosion process comprises the following steps that an internal anti-corrosion anode is lowered into a designed position through downhole tubular column operation and fixed in a resin coating and resin extrusion coating mode, a tubular column is reversely buckled and pulled out, correspondingly designed internal anti-corrosion anodes are operated sequentially, and then a production tubular column is lowered for production recovery. According to the anti-corrosion process, the effects of protecting the inner wall of a casing and prolonging the service life of an oil well are achieved through anode internal anti-corrosion. The anodes are attached to the interior of the casing, especially to areas with severe under-pump corrosion, so that the technical means of internal anti-corrosion of an oil field casing are enriched, and the risk of jamming of adrill due to the fact that excessive oil pipes enter a deep well to bring the anodes is avoided. The technical means of quick internal sticking of a plurality of anodes is realized, and the firmnessof the internal sticking anode tubes is realized in a coating and extruding plugging manner. By using a conductive resin adhesive, the purpose of bonding the anode tubes and the casing is achieved, and the conductive connection of the active metal anodes and the casing is realized.

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 Applications(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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