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Low-damage acid liquor used for oil and gas well acidizing and preparation method thereof

A technology for oil and gas wells and acid solutions, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of weakened chelating agent chelation, low solubility, weak acidity, etc., so as to slow down acid-rock reaction and prevent secondary Minor damage, stable effect

Inactive Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic phosphonic acid, acetic acid, citric acid and other additives are weak in acidity, and the solubility of various additives is small under strong acidic conditions, which weakens the chelating effect of chelating agents.

Method used

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  • Low-damage acid liquor used for oil and gas well acidizing and preparation method thereof
  • Low-damage acid liquor used for oil and gas well acidizing and preparation method thereof
  • Low-damage acid liquor used for oil and gas well acidizing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First add 65 kg of water into the reaction kettle, then add 15 kg of sulfosalicylic acid, 1 kg of ammonia hydrogen fluoride, 4 kg of ethanol, and 1 kg of ethylene glycol monobutyl ether in sequence at 15°C under stirring, and continue stirring for 50 minutes. Then add 2 kg of NH 4 Cl, 4 kg of corrosion inhibitor compounded by hexamethylenetetramine and thiourea according to the ratio of 1:2.2 parts by weight, stirred for 20 minutes, and mixed to obtain the product.

Embodiment 2

[0042] First add 80 kg of water to the reaction kettle, then add 5 kg of sulfosalicylic acid, 3 kg of ammonia hydrogen fluoride, 1 kg of ethanol, and 2 kg of ethylene glycol monobutyl ether in sequence at 30°C under stirring, and continue stirring for 20 minutes. Then add 4 kg of NH 4 Cl, 2 kg of corrosion inhibitor compounded by hexamethylenetetramine and thiourea according to the ratio of 1:1.8 parts by weight, stirred for 40 minutes, and mixed to obtain the product.

Embodiment 3

[0044] First add 70 kg of water to the reaction kettle, then add 9 kg of sulfosalicylic acid, 2 kg of ammonia hydrogen fluoride, 3 kg of ethanol, and 1.5 kg of ethylene glycol monobutyl ether in sequence at 22°C with stirring, and continue stirring for 35 minutes. Then add 3 kg of NH 4 Cl, 3 kg of a corrosion inhibitor compounded by hexamethylenetetramine and thiourea in a ratio of 1:2 parts by weight, stirred for 30 minutes, and mixed to obtain a product.

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Abstract

The invention provides low-damage acid liquor used for oil and gas well acidizing and a preparation method thereof. The low-damage acid liquor used for oil and gas well acidizing comprises the following raw materials in parts by weight: 0-8 parts of industrial hydrochloric acid, 1-3 parts of ammonium bifluoride, 5-15 parts of sulfosalicylic acid, 1-4 parts of ethyl alcohol, 2-4 parts of a corrosion inhibitor, 2-4 parts of a clay stabilizer, 1-2 parts of a mutual solvent and 65-80 parts of water. The acid liquor can be used for efficiently and safely dissolving sandstone reservoir matrices and blockages, can prevent residual acid in working fluid from producing precipitates and causing secondary damage, has protective effects on reservoirs, provides H+ to acidize scales and matrices in the reservoirs as an acid liquor main body on the one hand and can form a stable complex with metal ions as an excellent chelating agent on the other hand, also has excellent stability and does not produce any precipitate, thus preventing secondary damage.

Description

technical field [0001] The invention relates to a low-harm acid liquid agent used in the process of increasing production and injection of oil and gas wells in oil fields, especially a low-harm acid for acidizing oil and gas wells used in the process of increasing production and injection of oil and gas wells in sandstone reservoirs Liquid and its preparation method. Background technique [0002] Acidizing is one of the main technologies for increasing production and injection of oil and water wells in oilfields. The traditional acidizing system for sandstone reservoirs is mainly earth acid solution (ie HCl+HF system). In the acidizing process, hydrochloric acid is usually used as the pre-acid solution to dissolve calcium and related sensitive minerals in the oil layer to prevent secondary damage caused by the formation of insoluble precipitates between the earth acid solution and the minerals in the oil layer. However, it is not effective for reservoirs with strong acid-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72C09K8/74
CPCC09K8/72C09K8/74
Inventor 李强李建兵张君杜宝坛成梅华陈利霞王丹张磊卢占国宋菲
Owner CHINA PETROLEUM & CHEM CORP
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