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Organic acid system for acidification transformation of carbonate reservoir and preparation method

A carbonate reservoir and organic acid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as wellbore pitting, weak dissolution ability, and inability to increase the length of acid-etched fractures

Active Publication Date: 2019-09-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many deficiencies in the conventional hydrochloric acid working fluid. At present, the acid solution system for conventional fracturing acidification is usually 15% hydrochloric acid aqueous solution, but the reaction speed of hydrochloric acid and carbonate is too fast to increase the length of acid-etched fractures, resulting in the failure of fracturing operations. Gas production of post-construction wells is not high
In addition, the dissolution ability of conventional organic acid liquid is too weak, which may also cause severe pitting in the area around the wellbore, causing formation plugging and affecting oil and gas production
Therefore, the effect of acidification modification often fails to achieve the expected purpose

Method used

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  • Organic acid system for acidification transformation of carbonate reservoir and preparation method
  • Organic acid system for acidification transformation of carbonate reservoir and preparation method
  • Organic acid system for acidification transformation of carbonate reservoir and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First set the quality of the organic acid system to be configured, prepare organic acid liquid, the mass fraction of organic acid liquid in the organic acid system is 45%, adopt formic acid, acetic acid, benzoic acid, oxalic acid, succinic acid and propionic acid to form a mixed organic acid The acid solution has a mass ratio of 3:2:1:0.5:2:1.5.

[0025] EDTA is disodium EDTA, with a mass fraction of 0.2%.

[0026] The other components are 1% of corrosion inhibitor, 0.03% of retarding additive, 0.03% of iron ion stabilizer and 0.1% of drainage aid.

[0027] The iron ion stabilizer uses citric acid solution with a mass fraction of 40%, the drainage aid uses CF-5B and 1831 to form a mixed solution with a mass ratio of 1:1, and the corrosion inhibitor consists of imidazoline corrosion inhibitors and quaternary ammonium salts. The corrosion agents are mixed according to the mass ratio of 0.5:1 to form a mixed corrosion inhibitor.

[0028] Hydrophobic modified nano-SiO was...

Embodiment 2

[0031] First, set the quality of the organic acid system to be configured, prepare an organic acid solution, the mass fraction of the organic acid solution is 50%, use formic acid, acetic acid, benzoic acid, oxalic acid, succinic acid and propionic acid to form a mixed organic acid solution, the mass ratio It is 3:2:1:0.5:2:1.5.

[0032] EDTA is selected from disodium EDTA, and the mass fraction is 0.5%.

[0033] The other components are 0.3% of corrosion inhibitor, 0.08% of retarding additive, 0.08% of iron ion stabilizer and 0.5% of drainage aid.

[0034] The iron ion stabilizer uses citric acid solution with a mass fraction of 40%, the drainage aid uses CF-5B and 1831 to form a mixed solution with a mass ratio of 5:1, and the corrosion inhibitor consists of organic phosphate corrosion inhibitors and thiourea corrosion inhibitors. The corrosion inhibitor is mixed according to the mass ratio of 2:1 to form a mixed corrosion inhibitor.

[0035] Hydrophobic modified nano-SiO ...

Embodiment 3

[0038] First, the quality of the organic acid system to be configured is set, and the organic acid solution is prepared. The mass fraction of the organic acid solution is 55%. Formic acid, acetic acid, benzoic acid, oxalic acid, succinic acid and propionic acid are used to form a mixed organic acid solution. The mass ratio It is 3:2:1:0.5:2:1.5.

[0039] EDTA is selected from disodium EDTA, and the mass fraction is 0.7%.

[0040] The other components are 0.7% of corrosion inhibitor, 1% of retarding additive, 1% of iron ion stabilizer and 0.7% of drainage aid.

[0041] The iron ion stabilizer uses citric acid solution with a mass fraction of 40%, the drainage aid uses CF-5B and 1831 to form a mixed solution with a mass ratio of 2:1, and the corrosion inhibitor consists of imidazoline corrosion inhibitors and acetylenic alcohol inhibitors. The corrosion inhibitor is mixed according to the mass ratio of 1:1 to form a mixed corrosion inhibitor.

[0042] Hydrophobic modified nano...

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Abstract

The invention discloses an organic acid system for acidification transformation of a carbonate reservoir and a preparation method. The organic acid system comprises the following components in percentage by mass: 45-60% of an organic acid liquid, 0.3-2% of a corrosion inhibitor, 0.2-1% of EDTA (ethylene diamine tetraacetic acid), 0.03-1.5% of a slow-speed additive, 0.03-1.5% of an iron ion stabilizer, 0.1-1% of a discharge aiding agent and the balance of water. With the combination of the corrosion inhibitor and other components, the system is capable of preventing corrosion under a strong acid condition, acidification of pipeline equipment can be retarded, corrosion of equipment and tubes can be reduced, the reaction velocity of acidic rock can be reduced, the length of an acid etching crack can be increased, and thus an effect of deep acidification transformation can be achieved.

Description

technical field [0001] The invention belongs to the field of reservoir transformation of oil and gas fields, and relates to an organic acid system and a preparation method for acidification transformation of carbonate rock reservoirs. Background technique [0002] Carbonate reservoirs are currently the key areas of oil and gas exploration, and acidification is the main production increase measure for carbonate reservoir reconstruction. The purpose is to form wormholes in the formation through the reaction of organic acids and carbonate rock salts, and communicate natural gas seepage channels. To increase gas production, the conventional working fluid is mainly hydrochloric acid and hydrochloric acid compound system. [0003] However, there are many deficiencies in the conventional hydrochloric acid working fluid. At present, the acid solution system for conventional fracturing acidification is usually 15% hydrochloric acid aqueous solution, but the reaction speed of hydrochl...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/74C09K2208/10C09K2208/32
Inventor 王历历李宪文丁里张燕明石华强李小玲刘晓瑞孟磊祖凯傅鹏
Owner PETROCHINA CO LTD
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