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A kind of annular space protection liquid and preparation method thereof

A technology of annulus protection fluid and mixed fluid, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. It can solve the problems of accelerated corrosion rate, gas entering the annulus, serious loss, etc., and achieves a sterilization range Wide range, good anti-scaling ability, and the effect of improving the service life

Active Publication Date: 2019-05-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CO in natural gas 2 and H 2 The S content is not high, but the annular space is a confined space, and the incoming CO leaks continuously. 2 and H 2 S will accumulate, thereby changing the pH of the protective solution from alkaline to acidic, accelerating the corrosion rate and even causing corrosion perforation
The perforation will cause more gas to enter the annulus, and the associated losses will be more serious

Method used

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  • A kind of annular space protection liquid and preparation method thereof
  • A kind of annular space protection liquid and preparation method thereof
  • A kind of annular space protection liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides an annulus protection solution. In terms of weight percentage, the raw materials for preparing the annulus protection solution include:

[0029]

[0030] This embodiment also provides a preparation method for the above-mentioned annulus protection solution, which includes the following steps:

[0031] Step 1, according to the above ratio, add distilled water and cetyldimethyl (2-sulfite) ethylammonium into the reaction kettle, stir evenly to obtain the mixed solution A1;

[0032] Step 2, adding polyepoxysuccinic acid and dimethyl ketoxime to the mixed solution A1, stirring evenly to obtain the mixed solution B1;

[0033] Step 3: Add imidazoline phosphate, sodium chloride and sodium formate to the mixed solution B1, and stir evenly to obtain a ring space protection solution.

Embodiment 2

[0035] This embodiment provides an annulus protection solution. In terms of weight percentage, the raw materials for preparing the annulus protection solution include:

[0036]

[0037] This embodiment also provides a preparation method for the above-mentioned annulus protection solution, which includes the following steps:

[0038] Step 1, according to the above ratio, add distilled water and cetyldimethyl (2-sulfite) ethyl ammonium into the reaction kettle, stir evenly to obtain the mixed solution A2;

[0039] Step 2, adding polyepoxysuccinic acid and dimethyl ketoxime to the mixed solution A2, stirring evenly to obtain the mixed solution B2;

[0040] Step 3: Add imidazoline phosphate, sodium chloride and sodium formate to the mixed solution B2, and stir evenly to obtain a ring space protection solution.

Embodiment 3

[0042] This embodiment provides an annulus protection solution. In terms of weight percentage, the raw materials for preparing the annulus protection solution include:

[0043]

[0044] This embodiment also provides a preparation method for the above-mentioned annulus protection solution, which includes the following steps:

[0045] Step 1, according to the above ratio, add the mixture of distilled water, N-octyl-diaminoethylglycine and N,N-dioctyl-diaminoethylglycine (the mass ratio before and after the two is 1:3) to In the reaction kettle, stir evenly to obtain the mixed solution A3;

[0046] Step 2, adding polyaspartic acid and acetaldehyde oxime to the mixed solution A3, stirring evenly to obtain the mixed solution B3;

[0047] Step 3: Add imidazoline phosphorothioate, potassium chloride and potassium formate to the mixed solution B3, and stir evenly to obtain a ring space protection solution.

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Abstract

The invention provides an annular protecting fluid and a preparation method thereof. The annulus protecting fluid includes the following materials by weight: 5%-15% of a halide, 10%-20% of an organic acid salt, 2%-4% of an imidazoline corrosion inhibitor, 1%-4% of an oxime deoxidant, 0.5%-2% of a zwitterionic sterilizing agent, 1.5%-3% of a polymer scale inhibitor and balance of water. The annular protecting fluid has the advantages of wide density adjustment range, strong stability, excellent corrosion inhibition, excellent scale inhibition ability, good sterilizing effect, effective buffer of hydrogen ions produced by dissolving of CO2 and H2S and other acid gases, self repair and other related properties, low preparation cost, no pollution, greenness, capability of providing continuous and stable anticorrosion ability and great improvement of the service life of an oil casing, and is suitable for popularization and application in an acid-gas-containing gas reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil field chemistry, and relates to an annulus protection fluid and a preparation method thereof. Background technique [0002] As the first gas storage group in China, the Dagang gas storage group has been built for more than ten years, and has played an important role in the protection of natural gas in the Beijing-Tianjin area. Corrosion of injection-production strings is a major hidden danger in the actual operation of injection-production wells. After the injection-production string is lowered into the production casing and the packer is set, the oil casing annulus should be filled with protective medium to protect the inner casing, tubing, downhole tools, etc. in the annulus, so as to prolong the life of the injection-production well , and at the same time, it can balance the upper and lower pressures of the packer to facilitate the stable work of the packer. Through XRD inspection of corroded oil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 武俊文雷群熊春明张建军李隽刘岩贾敏王云
Owner PETROCHINA CO LTD
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