Method for reducing corrosion of strong oxidizing polymer degradation agent to oil well tubular column

A technology of strong oxidizing and degrading agents, which is applied in the field of reducing the corrosion of oil well tubing strings by strong oxidizing polymer degrading agents, can solve the problems of not being widely used and corrosion of oil well tubing strings, and achieves excellent corrosion inhibition performance, low cost, The effect of wide source of raw materials

Inactive Publication Date: 2018-08-03
SOUTHWEST PETROLEUM UNIV
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AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for reducing the corrosion of strong oxidants to oil well tubing strings in the polymer degradation process. The method adopts the use of inorganic corrosion inhibitors in the strong oxidant polymer degradation agent, and utilizes The binding force and adsorption effect form a uniform and dense protective film on the surface of the oil well tubing string, effectively isolating the contact between the metal surface and the strong oxidant molecules, thereby reducing the corrosion of the oil well tubing string by the strong oxidizing polymer degradation agent, and solving the problem of strong oxidizing properties. Due to the serious corrosion of oil well strings, polymer degradation agents cannot be widely used, and have broad market application prospects

Method used

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  • Method for reducing corrosion of strong oxidizing polymer degradation agent to oil well tubular column
  • Method for reducing corrosion of strong oxidizing polymer degradation agent to oil well tubular column
  • Method for reducing corrosion of strong oxidizing polymer degradation agent to oil well tubular column

Examples

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Effect test

Embodiment 1

[0028] Weigh different masses of Na 2 SiO 3 and Na 5 P 3 o 10 (both are analytically pure) to form (Si-P) composite corrosion inhibitors of different proportions, dissolve in distilled water, stir at room temperature for ten minutes, and wait for the two compounds to fully react in the aqueous solution to obtain different proportions of (Si-P) -P) Composite corrosion inhibitor solution.

[0029] Strong oxidizing polymer degrader solution: use analytically pure NaIO 4 Prepare 1% NaIO with formation water 4 solution.

[0030] The prepared (Si-P) composite corrosion inhibitor was used for corrosion protection of steel samples in strong oxidative polymer degradant solution.

[0031] 2. Compatibility of (Si-P) composite corrosion inhibitor and strong oxidizing polymer degradation agent solution

Embodiment 2

[0033] Pour 100 mL of the prepared strong oxidizing polymer degradation agent solution into a stoppered colorimetric tube, add 5% (Si-P) composite corrosion inhibitor, shake for 5 minutes and mix well. Then put the colorimetric tube into a constant temperature water bath, keep the temperature constant for 48 hours, and observe the state of the solution.

[0034] Compatibility test results show that the polymer degradation agent solution containing 5% (Si-P) composite corrosion inhibitor is transparent and clear, and there is no liquid / liquid phase and liquid / solid phase separation. It shows that the (Si-P) composite corrosion inhibitor has excellent solubility and dispersibility in the solution of strong oxidizing polymer degradation agent, reaching the first-class standard.

[0035] 3. Corrosion performance test of strong oxidizing polymer degrading agent solution

[0036] Steel sample treatment: grind the 30mm×20mm×2mm steel sample with 400#, 600#, 800# sandpaper in turn, t...

Embodiment 3

[0037]Embodiment 3: Weight loss method test

[0038] Accurately weigh the treated steel samples, suspend them in strong oxidative polymer degradant solutions with and without (Si-P) composite corrosion inhibitors, and take out the steel samples after 4 hours of immersion corrosion experiment (constant temperature 333K) The samples were washed, dried, and accurately weighed to calculate the average weight loss ΔW of the steel samples.

[0039] Corrosion rate calculation:

[0040] In the formula, ΔW is the average weight loss of the steel sample before and after the corrosion test, g; s is the surface area of ​​the steel sample, mm 2 ; t is the corrosion test time, h; C R is the average corrosion rate of steel, g / (m 2 h).

[0041] figure 1 It is the corrosion rate graph of steel in strong oxidizing polymer degradant solutions with different additions of (Si-P) composite corrosion inhibitor. The corrosion rate of steel decreases with the increase of (Si-P) composite corro...

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Abstract

The invention discloses a method for reducing corrosion of a strong oxidizing polymer degradation agent to an oil well tubular column. The method comprises the steps that firstly, the strong oxidizingpolymer degradation agent is dissolved in water, a strong oxidizing polymer degradation agent solution is obtained, and the mass percent of the degradation agent is 1%; secondly, sodium silicate andsodium tripolyphosphate are dissolved in water according to the mass ratio of (1-4.6): (0.5-2.3), stirring is carried out for 10 minutes at the normal temperature, and a (Si-P) compound corrosion inhibitor water solution with different proportions is obtained; and thirdly, the (Si-P) compound corrosion inhibitor water solution is used for reducing the corrosion of steel in the strong oxidizing polymer degradation agent solution, and the total mass percent of the sodium silicate and the sodium tripolyphosphate in the strong oxidizing polymer degradation agent solution is 0.15%-0.69%. Accordingto the method, the interatomic binding force and the adsorption action of the inorganic corrosion inhibitor and the steel interface are used, a protection film is formed on the surface of the oil welltubular column, a metal surface is effectively isolated from making contact with strong oxidant molecules, the corrosion of the strong oxidizing polymer degradation agent to the oil well tubular column is reduced, and wide market application prospects are achieved.

Description

technical field [0001] The invention relates to a method for reducing corrosion of oil well pipe strings by strong oxidizing polymer degradation agents in the development process of oil and gas fields. The method can not only reduce corrosion damage but also realize environmental friendliness. Background technique [0002] A large number of research results on the clogging mechanism of polymer injection wells in heavy oil oilfields show that the main reason for the clogging of polymer injection wells in heavy oil oilfields is that after polymer injection into the formation, it wraps and entangles with oil scale and inorganic scale, and reacts under high temperature and high pressure conditions in the formation. Aged denatured plugging micelles with complex structure and stable chemical properties are formed. High-molecular polymers usually use oxidative degradation to break their molecular chains and reduce the viscosity of the solution, so as to achieve the purpose of unblo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/18
CPCC23F11/188
Inventor 朱艳华赵立强刘平礼刘长龙刘义刚李凤杨明孟祥海罗志锋邹剑李年银杜娟
Owner SOUTHWEST PETROLEUM UNIV
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