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Corrosion-resistant and scouring-resistant surface protection method for oil well packer

A packer and corrosion-resistant technology, which is applied to the surface coating liquid device, anti-corrosion coating, coating, etc., can solve the problems of unsatisfactory protection effect, reduce oil well maintenance and production costs, and improve penetration and invasion Difficulty, the effect of reducing the risk of failure

Active Publication Date: 2022-07-22
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the surface protection technology of downhole packers is still dominated by a single heavy-duty anti-corrosion coating. The "DPC inner coating + epoxy cold wrapping tape" technology used in very few wells can slow down corrosion to a certain extent, but the protection effect is still not very good ideal

Method used

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  • Corrosion-resistant and scouring-resistant surface protection method for oil well packer
  • Corrosion-resistant and scouring-resistant surface protection method for oil well packer
  • Corrosion-resistant and scouring-resistant surface protection method for oil well packer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A corrosion-resistant and erosion-resistant surface protection method for an oil well packer, comprising the following process steps:

[0022] The first step is to clean the metal components of the oil well packer before painting. The specific processing steps are as follows: first, clean the metal components with industrial pure water, ultrasonically clean and remove oil with metal degreasing solution at a temperature of 55 °C, and use industrial pure water. Cleaning, rust removal liquid ultrasonic surface rust removal at a temperature of 50 ℃, industrial pure water cleaning, pure water cleaning, UV ultrapure water cleaning, high temperature drying room 130 ℃ drying water.

[0023] In the second step, the bottom protective layer (phosphate ceramic membrane protective layer) is prepared on the metal components of the oil well packer. The specific process operations are as follows: the cleaned metal components of the oil well packer are immersed in the phosphate treatment...

Embodiment 2

[0034] A corrosion-resistant and erosion-resistant surface protection method for an oil well packer, comprising the following process steps:

[0035] The first step is to clean the metal components of the oil well packer before painting. The specific processing steps are as follows: first, clean the metal components with industrial pure water, ultrasonically clean and remove oil with metal degreasing solution at a temperature of 55 °C, and use industrial pure water. Cleaning, rust removal solution ultrasonic surface rust removal at a temperature of 50 ℃, industrial pure water cleaning, pure water cleaning, UV ultrapure water cleaning, high temperature drying room 120 ℃ drying water.

[0036] In the second step, the bottom protective layer (phosphate ceramic membrane protective layer) is prepared on the metal components of the oil well packer. The specific process operations are as follows: the cleaned metal components of the oil well packer are immersed in the phosphate treatme...

Embodiment 3

[0046] A corrosion-resistant and erosion-resistant surface protection method for an oil well packer, comprising the following process steps:

[0047] The first step is to clean the metal components of the oil well packer before painting. The specific processing steps are as follows: first, clean the metal components with industrial pure water, ultrasonically clean and remove oil with metal degreasing solution at a temperature of 55 °C, and use industrial pure water. Cleaning, rust removal liquid ultrasonic surface rust removal at a temperature of 50 ℃, industrial pure water cleaning, pure water cleaning, UV ultrapure water cleaning, high temperature drying room 130 ℃ drying water.

[0048] In the second step, the bottom protective layer (phosphate ceramic membrane protective layer) is prepared on the metal components of the oil well packer. The specific process operations are as follows: the cleaned metal components of the oil well packer are immersed in the phosphate treatment...

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PUM

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Abstract

The invention discloses a corrosion-resistant and scouring-resistant surface protection method for an oil well packer. The surface of a metal component of the oil well packer is coated with a phosphate ceramic membrane protection layer with the thickness being 40-70 microns, an epoxy-organic silicon modified anti-corrosion coating with the thickness being 100-130 microns and a fluorocarbon anti-corrosion coating with the thickness being 180-220 microns in sequence in a stacked mode. The epoxy-organic silicon modified anticorrosive coating is prepared from the following raw material components in parts by weight: 200 to 280 parts of epoxy-organic silicon resin, 50 to 80 parts of carbon fiber, 60 to 90 parts of carbon fiber felt, 30 to 60 parts of aluminum oxide and 30 to 60 parts of titanium oxide; the fluorocarbon anticorrosive coating is prepared from the following raw material components in parts by weight: 300 to 450 parts of polytrifluorochloroethylene-based resin, 20 to 35 parts of graphene oxide and 60 to 73 parts of silicon dioxide. According to the protection method, the reliability of the packer in the service environment can be improved, the hydrogen sulfide, carbon dioxide and formation water corrosion resistance and the fluid scouring resistance of the packer are improved, preparation is convenient, the cost is low, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of oil and gas well safety, in particular to a corrosion-resistant and erosion-resistant surface treatment method for oil well packers. Background technique [0002] In the existing oil exploitation, in order to protect the casing from the corrosive environment of the oil and gas reservoir and ensure the integrity of the wellbore, a single well needs a lower packer to seal the oil casing annulus, and the oil reservoir is layered. During the production process, the force of the packer is complex, and the required materials are mostly steel and other metal materials with excellent mechanical properties. However, with the development of oil and gas exploration to complex blocks, drilling and completion techniques have gradually shifted to deep wells and ultra-deep wells, moving from land to ocean. The formation is often high temperature and high pressure, and some wells have CO 2 , H 2 The higher the content ...

Claims

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Application Information

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IPC IPC(8): C09D183/10C09D127/12C09D5/08C09D7/61B05D7/14
CPCC09D183/10C09D127/12C09D5/08C09D5/18C09D7/61B05D7/546B05D7/544B05D7/51B05D7/14B05D2506/00C08K7/06C08K3/042C08K3/36
Inventor 张明马英文龚宁程飞胡立鹏张雪峰王一生严永博钟显康
Owner CNOOC TIANJIN BRANCH
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