A kind of self-steering acidification liquid and its preparation method and application

An acidifying fluid and self-steering technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of large reservoir damage, low reservoir temperature, limitation, etc., so as to improve the temperature resistance performance and reverse drainage. Efficiency, the effect of increasing strength

Inactive Publication Date: 2020-05-22
中海石油伊拉克有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical steering technology in the prior art is suitable for lower reservoir temperature and has greater damage to the reservoir, which is limited in practical application

Method used

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  • A kind of self-steering acidification liquid and its preparation method and application

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preparation example Construction

[0045] The present invention provides the preparation method of self-steering acidification liquid described in above-mentioned technical scheme, comprises the following steps:

[0046] The self-steering acidizing solution is obtained by mixing the derivatives of betaine erucate, betaine surfactants, stabilizers, anti-temperature agents, corrosion inhibitors, mutual solvents, drainage aids, acids and water.

[0047] When preparing the self-steering acidification liquid, the present invention has no special limitation on the order of adding components in the self-steering acidification liquid, and any order of addition can be adopted. In the present invention, there is no special limitation on the mixing, and a technical solution well known to those skilled in the art can be used to mix the components uniformly. In the present invention, the mixing is preferably carried out under stirring conditions, and the stirring rate is preferably 200-400 r / min, more preferably 250-350 r / m...

Embodiment 1

[0051] The component distribution ratio of the self-steering acidification solution: 5 wt% of 13-docosenoic acid amidopropyl xanthyl betaine, 0.8 wt% of octadecenoic acid amidopropyl betaine, and 15% hydrochloric acid by mass 20wt%, citric acid 1.5wt%, dipropanol 1wt%, polyacrylic acid 0.5wt%, ethylene glycol monobutyl ether 2wt%, perfluoropolyoxypropylene heptanol ether 0.25wt% and the rest water.

[0052] According to the above-mentioned component distribution ratio, under the condition of a stirring rate of 200r / min, the various components were mixed, and the stirring was continued for 40 minutes to obtain a self-steering acidification solution.

Embodiment 2

[0054] The component distribution ratio of the self-steering acidification solution: 13-docosenoic acid amidopropyl-dihydroxyethyl betaine 4wt%, octadecenoic acid amidopropyl-dihydroxyethyl betaine 1wt%, mass percent 20% hydrochloric acid 15wt%, 2,3,5,6-tetrahydroxy-2-hexenoic acid-4-lactone 1wt%, glycerol 0.5wt%, sodium polyphosphate 0.3wt%, diethylene glycol Alcohol ethyl ether 1wt%, perfluoropropionamido-1,2-ethylenemethyldiethylammonium iodide 0.5wt%, and the rest water.

[0055] According to the above-mentioned component distribution ratio, under the condition of a stirring rate of 400r / min, the components were mixed, and the stirring was continued for 20 minutes to obtain a self-steering acidification solution.

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Abstract

The invention provides a self-steering acidizing fluid, which is prepared from the following raw materials in percentages by weight: 3-5wt% of a derivative of erucic acid glycine betaine, 0.5-1wt% of a glycine betaine surfactant, 1-2.5wt% of a stabilizer, 0.5-1.5wt% of a temperature-resistant agent, 0.3-0.5wt% of a corrosion inhibitor, 1-2wt% of a mutual solvent, 0.2-0.5wt% of a cleanup additive, 15-25wt% of acid and the balance of water. The provided self-steering acidizing fluid is applied to transformation of a carbonate rock reservoir, and hardly damages reservoir permeability, and the applicable reservoir temperature is relatively high and reaches 90-130 DEG C.

Description

technical field [0001] The invention relates to the technical field of carbonatite reservoir exploitation, in particular to a self-steering acidizing fluid and its preparation method and application. Background technique [0002] Carbonate reservoir is one of the main types of oil and gas reservoirs. Carbonate reservoirs are characterized by a large number of fractures or micro-fractures, high permeability, but low matrix permeability. In order to improve reservoir productivity, it is generally necessary to acidify and transform the reservoir before putting it into production. However, during the acidizing process, the fingering phenomenon of acid liquid in the fracture is very serious, and a large amount of acid liquid enters the fracture, so that the fractures with high permeability should not be acidified excessively, and the matrix parts with low permeability that need to be acidified are acidified To a lesser degree, the acidifying effect is reduced and the penetratio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 王胜翔林枫牟云龙王雷杨培龙程爽许明标文守成
Owner 中海石油伊拉克有限公司
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