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High-temperature annular protection fluid and preparation method thereof

An annulus protection fluid and protection fluid technology, applied in earthwork drilling, wellbore/well components, etc., can solve the problems of weakened continuous protection ability of tubing and casing, poor anti-H sterilization ability, obvious delamination phenomenon, etc. Achieve the effects of providing protection, high temperature resistance, and simple preparation process

Active Publication Date: 2014-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oil casing has been in this environment for a long time, and the pressure difference on the casing head or the packer is very large, which is very easy to cause stress damage, and the safety hazard is very large. If the above-mentioned annulus protection fluid is used, it cannot be applied at all. Mainly manifested in: 1. Insufficient temperature resistance. Under high temperature conditions, the corrosion rate is too large, the delamination phenomenon is obvious, and the continuous protection ability of oil casing is weakened; 2. Under high temperature conditions, the anti-H 2 S, CO 2 And the ability to sterilize is poor; 3. The density range is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The invention is prepared from the following raw materials: 160kg of sodium formate, 3kg of cationic surfactant, 3kg of sodium sulfite, 15kg of gas well corrosion inhibitor, 10kg of potassium hydroxide and 809kg of distilled water.

[0027] The preparation method of the present invention is: 1). Add 809kg of distilled water to the steel reactor; 2). Add 3kg of cationic surfactant to 809kg of distilled water and stir evenly; 3). Add 3kg of sodium sulfite to the solution in step 2). , and stir to completely dissolve sodium sulfite; 4). Add 160kg of sodium formate, 10kg of potassium hydroxide and 15kg of gas well corrosion inhibitor to the solution in step 3), and stir evenly to obtain the product.

[0028] Using the prepared product to test P110 metal steel sheet, the corrosion is small, and the compatibility of each component in the solution is good. The obtained solution is clear and transparent, without precipitation, and there is no delamination phenomenon after 72 hou...

Embodiment 2

[0030] The invention is prepared from the following raw materials: 330kg of sodium formate, 5kg of cationic surfactant, 4kg of sodium sulfite, 19kg of gas well corrosion inhibitor, 7kg of potassium hydroxide and 635kg of distilled water.

[0031] The preparation method of the present invention is: 1). Add 635kg of distilled water to the steel reaction kettle; 2). Add 5kg of cationic surfactant to 635kg of distilled water and stir evenly; 3). Add 4kg of sodium sulfite to the solution in step 2). , Stir to completely dissolve the sodium sulfite; 4). Add 330kg of sodium formate, 7kg of potassium hydroxide and 19kg of gas well corrosion inhibitor to the solution in step 3), and stir evenly to obtain the product.

[0032] Using the prepared product to test P110 metal steel sheet, the corrosion is small, and the compatibility of each component in the solution is good. The obtained solution is clear and transparent, without precipitation, and there is no delamination phenomenon after ...

Embodiment 3

[0034] The invention is prepared from the following raw materials: 480kg formate, 4kg cationic surfactant, 4kg sodium sulfite, 16kg gas well corrosion inhibitor, 10kg potassium hydroxide and 486kg distilled water.

[0035] The preparation method of the present invention is: 1). Add 486kg of distilled water in the steel reactor; 2). Add 4kg of cationic surfactant in 486kg of distilled water and stir evenly; 3). Add 4kg of sodium sulfite to the solution in step 2). , Stir to completely dissolve the sodium sulfite; 4). Add 480kg of formate, 10kg of potassium hydroxide and 16kg of gas well corrosion inhibitor to the solution in step 3), and stir evenly to obtain the product.

[0036] Using the prepared product to test P110 metal steel sheet, the corrosion is small, and the compatibility of each component in the solution is good. The obtained solution is clear and transparent, without precipitation, and there is no delamination phenomenon after 72 hours at room temperature; after 16...

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Abstract

The invention discloses a high-temperature annular protection fluid and a preparation method thereof. The protection fluid is prepared from the following raw materials in percentage by weight: 0.14-83.70% of organic salt, 0.1-0.5% of bactericide, 0.1-0.5% of deoxidizer, 1.5-2.0% of gas well corrosion inhibitor, 0.7-1.3% of pH regulator and the balance of distilled water. The preparation method comprises the following steps: 1) adding a certain amount of distilled water into a reaction kettle; 2) adding the bactericide into the distilled water, and stirring evenly; 3) adding the deoxidizer into the solution obtained in the step 2), and stirring until the deoxidizer is completely dissolved; and 4) sequentially adding the organic salt, pH regulator and gas well corrosion inhibitor into the solution obtained in the step 3), and stirring evenly to obtain the product. The maximum temperature resistance of the protection fluid disclosed by the invention is up to more than 160 DEG C, and the maximum density is up to 2.3g / cm<3>; and the protection fluid is reliable and stable, and does not have the phenomenon of stratification or precipitation.

Description

technical field [0001] The invention relates to an annulus protection fluid for an oil casing in an oil and gas well, in particular to a high-temperature annulus protection fluid and a preparation method for the protection fluid. Background technique [0002] Since oil and gas wells contain H 2 S, CO 2 , water and other corrosive media, the downhole pipe string (including oil casing) will be corroded and damaged, which greatly shortens the service life of the pipe string and increases the cost of oil and gas production. For this reason, the traditional method is to use sulfur-resistant tubing and buffer injection, that is, to use sulfur-resistant and corrosion-resistant materials for downhole pipe strings and wellhead devices to improve the anti-corrosion performance of materials, and fundamentally control the sulfide stress corrosion cracking that occurs in the early stage of production. , and then by injecting a suitable corrosion inhibitor, the normal production of oil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54
Inventor 戚斌潘宝风孙勇杨兵刘徐慧赵祚培廖忠会杨东梅陈颖袆李洪波向丽李莎莎
Owner CHINA PETROLEUM & CHEM CORP
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