Crosslinking agent capable of crosslinking organic acid, and preparation method and application thereof

An organic acid and cross-linking agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of not meeting the requirements of deep penetration of the acidizing system, not being able to cross-link organic acid liquid, and not treating the formation Deep and other problems, to achieve good delayed crosslinking performance, long effective distance of acid etching, good temperature resistance and shear resistance

Active Publication Date: 2019-06-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cross-linking agent of these invention patents can effectively cross-link hydrochloric acid, but cannot cross-link organic acid
[0005] The main disadvantage of hydrochloric acid is that it reacts quickly with limestone, especially in high-temperature deep wells. Due to the high temperature of the formation, hydrochloric acid interacts with the formation too quickly, so it cannot treat the deep part of the formation.
With the development of carbonate rock reservoirs, the existing cross-linked acid system gradually cannot meet the increasingly high requirements for deep penetration of the acidizing system
The organic acid is a weak ionic acid. The acid rock reacts slowly and is resistant to high temperature. It is used in high temperature oil wells or wells that want to prolong the reaction time and penetrate deeply. It consumes slowly in the formation, penetrates deeper and improves the stimulation effect. However, there is no cross-linking agent that can effectively cross-link organic acids, so it is necessary to develop a cross-linking agent that can be used for cross-linking organic acids and a preparation method thereof

Method used

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  • Crosslinking agent capable of crosslinking organic acid, and preparation method and application thereof
  • Crosslinking agent capable of crosslinking organic acid, and preparation method and application thereof
  • Crosslinking agent capable of crosslinking organic acid, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 5g of titanium tetrachloride, 50g of isopropanol, and 15g of ethylene glycol into a three-necked flask equipped with stirring and a thermometer, heat to 40°C, and stir at a constant speed of 190r / min for 30min. Add 20g of glycine and 3g of polyepoxysuccinic acid to the above homogeneous solution, heat to 60°C, and stir at 190r / min for 2h; the organic acid crosslinking agent is obtained.

[0039] Application of organic acid crosslinking agent for crosslinking organic acids. The cross-linking experiment method is as follows:

[0040]Slowly add a polymer thickener to the mixed solution of hydrochloric acid, formic acid and water stirred at a constant speed of 400-500r / min according to the proportion, the mass fraction of hydrochloric acid in the mixed solution is 15%, and the mass fraction of formic acid is 8%; the polymer thickens The dosage of the agent is 1% of the mixed liquid, and then stir at a constant speed of 600-650r / min for 30-35min, dissolve evenly and for...

Embodiment 2

[0042] Add 8g of tetraisopropyl titanate, 30g of isopropanol, and 20g of ethylene glycol into a three-necked flask equipped with a stirring and thermometer, heat to 40°C, and stir at a constant speed of 200r / min for 30min. Add 10g of serine and 3g of polyepoxysuccinic acid to the above homogeneous solution, heat to 80°C, and stir at 200r / min for 2h; the organic acid crosslinking agent is obtained.

[0043] Application of organic acid crosslinking agent for crosslinking organic acids. The cross-linking experiment method is as follows:

[0044] Slowly add a polymer thickener to the mixed solution of hydrochloric acid, formic acid and water stirred at a constant speed of 400-500r / min according to the proportion, the mass fraction of hydrochloric acid in the mixed solution is 15%, and the mass fraction of formic acid is 8%; the polymer thickens The dosage of the agent is 0.8% of the mixed liquid, and then stir at a constant speed of 600-650r / min for 30-35min, dissolve evenly and ...

Embodiment 3

[0047] Add 4g of titanium nitrate, 20g of isopropanol, and 10g of ethylene glycol into a three-necked flask equipped with a stirring and thermometer, heat to 40°C, and stir at a constant speed of 180r / min for 30min. Add 5g of aspartic acid and 2g of polyepoxysuccinic acid to the above homogeneous solution, heat to 60°C, and stir at 180r / min for 2h; the organic acid crosslinking agent is obtained.

[0048] The experimental method of cross-linking effect is as in Example 1. Add 1% of the prepared organic acid cross-linking agent to the thickening acid, and stir for 3 minutes after the addition to form an adjustable hanging jelly. to obtain organic cross-linked acids.

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Abstract

The invention relates to a crosslinking agent capable of crosslinking organic acid, and a preparation method and application thereof. The organic acid crosslinking agent is prepared from a titanium compound, isopropyl alcohol, ethylene glycol, amino acid and polyepoxysuccinic acid. The organic acid crosslinking agent is used for crosslinking of the organic acid in acidification and acid fracturingof an oil field, so the viscosity of an organic acid liquid system is increased; the temperature resistance of the acid liquid system is improved; the effective action distance of acid etching is longer; and the needs of deep-burial and high-temperature reservoirs are met.

Description

technical field [0001] The invention relates to a crosslinking agent for crosslinkable organic acids, a preparation method and application thereof, and belongs to the technical field of crosslinking agents in petrochemical industry. Background technique [0002] Fracture-vuggy carbonate reservoirs are dominated by fracture-vug reservoirs, with strong reservoir heterogeneity and basically no oil and gas in the matrix. Such reservoirs generally cannot be put into production through natural completion. Generally, the natural productivity of oil wells is low or has no natural productivity after completion. It is necessary to communicate with favorable karst reservoirs through acid fracturing to realize oil well production. [0003] The reservoir space of fractured-cavity carbonate reservoirs mainly has the forms of pores, caves, and fractures, and the reservoir types mainly include dissolved-vug, fracture-cavity, and fracture types. The goal of acid fracturing in carbonate rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/88
Inventor 王彦玲张传保白宝君戎旭峰李强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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