Method for inhibiting corrosion of oil producing well tube inner wall

A technology for the inner wall of barrels and oil production wells, which is applied in the field of corrosion control. It can solve the problems of short maintenance time of corrosion inhibitors and achieve strong oxygen resistance, good corrosion resistance and mechanical properties, and good effects.

Active Publication Date: 2015-11-11
控环科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to provide a method for inhibiting the corrosion of the inner wall of the oil production wellbore, to solve the problem that the corrosion inhibition effect of the existing corrosion inhibitors is short

Method used

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  • Method for inhibiting corrosion of oil producing well tube inner wall

Examples

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Embodiment 1

[0042] The production process of the silicon-zirconium composite solution is as follows: dissolve 20g of epoxy siloxane in 200g of ethanol, add 200g of water to the solution, adjust the pH value of the mixed solution to 4-5, and then heat the mixed solution to 20 Hydrolyze at -80°C for 1-6 hours, cool to room temperature, and age for 24 hours to form a silane solution; the heating temperature is preferably 40-70°C, most preferably 60°C, and the hydrolysis time is preferably 2 hours.

[0043] Dissolve 10g of ammonium fluorozirconate in 600ml of water; add 1g of sodium molybdate, 0.5g of boric acid, 0.5g of citric acid and 1g of diethanolamine in sequence to the ammonium fluorozirconate solution.

[0044] Add the ammonium fluozirconate solution into the epoxy siloxane solution, adjust the pH value to 5-6, and stir for 1 hour to obtain a silicon-zirconium composite solution. The solid content of the silicon-zirconium composite solution is preferably 20-40%, and the optimum It is ...

Embodiment 2

[0046] The production process of the silicon-zirconium composite liquid is as follows: dissolve 20g of vinyl siloxane in 200g of ethanol, add 200g of water to the solution, adjust the pH value of the mixed solution to 4-5, and then heat the mixed solution to 20- Hydrolyze at 80°C for 1-6 hours, cool to room temperature, and age for 24 hours to form a silane solution; the heating temperature is preferably 40-70°C, most preferably 60°C, and the hydrolysis time is preferably 2 hours.

[0047]Dissolve 10g of ammonium fluorozirconate in 600ml of water; add 1g of sodium molybdate, 0.5g of boric acid, 0.5g of citric acid and 1g of diethanolamine in sequence to the ammonium fluorozirconate solution.

[0048] Add the ammonium fluorozirconate solution into the vinyl siloxane solution, adjust the pH value to 5-6, and stir for 1 hour to obtain a silicon-zirconium composite solution. The solid content of the silicon-zirconium composite solution is preferably 20-40%, most preferably The use...

Embodiment 3

[0050] Composite corrosion inhibitor is composed of two kinds of corrosion inhibitors (the compounding ratio of corrosion inhibitor 1 and corrosion inhibitor 2 is 1:1, 1:2 or 1:3).

[0051] The production process of corrosion inhibitor 1 is:

[0052] Add 3 kg of alkyl alkenoic acid into the reactor, start stirring and raise the temperature of the reactor to 70°C, slowly add 0.5 kg of polyethylene polyamine into the reactor, then pass nitrogen into the reactor, and slowly raise the temperature of the reactor React at a constant temperature of 120°C for 1 hour, then slowly raise the temperature of the reactor to 180°C for 2 hours, then raise the temperature of the reactor to 230°C for 4 hours, then lower the temperature of the reactor to below 100°C, slowly pour into the reactor Add 0.5 kg of sulfur-based compound, and finally raise the temperature of the reactor to 130°C for 4 hours of constant temperature reaction to obtain corrosion inhibitor 1.

[0053] The molecular struct...

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Abstract

The invention provides a method for inhibiting the corrosion of an oil producing well tube inner wall. The method comprises the following steps of: injecting silicon zirconium compound liquid with the solid content being 10 to 50 percent and the temperature being 30 to 90 DEG C into the well tube inner wall to from a precipitation membrane on the well tube inner wall; injecting a composite corrosion inhibitor with the concentration being 500 to 5000 mg / L into the precipitation membrane; and forming a dynamic adsorption membrane on the basis of the precipitation membrane. When the method for inhibiting the corrosion of the oil producing well tube inner wall provided by the invention is used, the corrosion of the oil producing well tube inner wall can be effectively inhabited, and the duration time is long.

Description

technical field [0001] The invention belongs to the technical field of corrosion control, and more specifically relates to a method for inhibiting corrosion of the inner wall of an oil production wellbore. Background technique [0002] In the process of developing oilfields, oil well corrosion has always been a major problem faced by oilfield exploitation. As the oil field continues to be exploited, the pressure of the downhole oil layer decreases, and the production of the oil well decreases. Water injection and gas injection into the underground oil layer will be used to pressurize and drive oil to increase production. However, after the gas-water mixed injection, the oxygen in the oil well, high mineralization High-temperature brine will corrode the wellbore and equipment, leading to the failure of the main pumping string in the equipment. If the tubing is severely corroded, it will affect the development of the oil field. Therefore, how to prevent the corrosion of wellb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B41/02C09K8/54
Inventor 刘竟成赵海洋欧阳冬丁保东廖冲春颜邦民李淑杰张建军董瑞强曾顺鹏杨浩珑刘菊梅邢钰何晓庆徐春碧虞朝阳蒋俊龙石磊
Owner 控环科技集团有限公司
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