A kind of organic crosslinking acid system and its preparation method and application

A technology of organic acid and cross-linked acid solution, which is applied in chemical instruments and methods, mining fluids, earthwork drilling and mining, etc. It can solve the problem that the deep penetration of the acidification system cannot be met, the interaction between hydrochloric acid and the formation is fast, and the formation cannot be treated. Deep and other problems, to achieve the effect of long acid etching effective action distance, improve production increase effect, and increase viscosity

Active Publication Date: 2021-04-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The acid in the cross-linked acid liquid system is mainly hydrochloric acid. 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, the interaction between hydrochloric acid and the formation is too fast, so it cannot be treated deep in 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

Method used

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  • A kind of organic crosslinking acid system and its preparation method and application
  • A kind of organic crosslinking acid system and its preparation method and application
  • A kind of organic crosslinking acid system and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The components of the organic cross-linking acid liquid system are as follows by mass percentage: concentrated hydrochloric acid 55.6% (equivalent to 20% of pure hydrogen chloride), formic acid 5%, polymer thickener (acrylamide-2-acrylamide-2-methyl propane Sulfonic acid (AMPS) copolymer, molecular weight 8,000,000, monomer molar ratio is acrylamide:2-acrylamido-2-methylpropanesulfonic acid (AMPS)=8:2) 1.0%, organic acid crosslinking agent 1.0 %, the rest is water.

[0036] Preparation of organic crosslinking acid solution:

[0037] (1) Synthesis of organic acid crosslinking agent

[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 desired organic acid crosslinking ag...

Embodiment 2

[0043] The composition of the organic cross-linking acid liquid system is as follows by mass percentage: concentrated hydrochloric acid 55.6% (equivalent to 20% of pure hydrogen chloride), acetic acid 5%, polymer thickener 1.0%, organic acid cross-linking agent 1.0%, and the rest is water. The polymer thickener is acrylamide-2-acrylamide-2-methylpropanesulfonic acid (AMPS) copolymer, molecular weight 10 million, monomer molar ratio is acrylamide:2-acrylamide-2- Methylpropanesulfonic acid (AMPS) = 8:2.

[0044] Preparation of organic crosslinking acid liquid system:

[0045] (1) Synthesis of organic acid crosslinking agent

[0046] Add 7g of tetraisopropyl titanate, 30g of isopropanol, and 20g of ethylene glycol into a three-neck 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 leucine and 2g of polyepoxysuccinic acid to the above homogeneous solution, heat to 80°C, and stir at 200r / min for 2h to obta...

Embodiment 3

[0051] The organic cross-linking acid liquid system has the following components by mass percentage:

[0052] 55.6% concentrated hydrochloric acid (20% equivalent to pure hydrogen chloride), 5% acetic acid, 7.5% hydrofluoric acid (3% equivalent to pure HF), polymer thickener (acrylamide-methacryloyloxyethyl trimethyl Ammonium chloride copolymer, molecular weight 6,000,000, monomer molar ratio is acrylamide: methacryloyloxyethyltrimethylammonium chloride=10:3) 1.2%, organic acid crosslinking agent (prepared in embodiment 3 ) 1.0%, and the rest is water.

[0053] Preparation of organic crosslinking acid solution:

[0054] (1) Synthesis of organic acid crosslinking agent: Add 4g of titanium nitrate, 20g of isopropanol, and 10g of ethylene glycol into a three-neck 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...

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Abstract

The invention relates to an organic cross-linking acid system and its preparation method and application. The components of the organic cross-linking acid liquid system are: hydrochloric acid, organic acid, hydrofluoric acid or ammonium bifluoride, polymer thickener, organic acid cross-linking agent, and the rest is water; the preparation method includes: hydrochloric acid, organic acid, hydrogen Slowly add polymer thickener to the solution of hydrofluoric acid or ammonium bifluoride and water, then stir and dissolve at 600-650r / min to form a clear liquid, and let it stand for 2-4h to obtain thickened acid, and add the above-mentioned Organic acid cross-linking agent, stir for 1‑5min after adding, to obtain an organic cross-linking acid system. The organic cross-linked acid liquid system is used for acidizing acid fracturing of high-temperature carbonate rock or sandstone oil and gas reservoirs to increase production; after the hydrochloric acid in the system is consumed, the organic acid continues to react with the formation, so it penetrates more than the hydrochloric acid cross-linked acid system The longer the distance, the more pronounced the effect.

Description

technical field [0001] The present application provides an organic cross-linked acid system which can be used in oil field acidizing and acid fracturing, as well as its preparation and application. 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 reservoirs is to form acid-etched fract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74E21B43/27
CPCC09K8/74E21B43/26
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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