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Ground crosslinked acid crosslinking agent and preparation method thereof

A technology of cross-linking acid and cross-linking agent, applied in the field of exploration, can solve the problems of high toxicity, difficult to control the cross-linking time, etc., and achieve the effects of good elasticity, shortening the gel formation time, and prolonging the cross-linking time.

Active Publication Date: 2014-01-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The crosslinking agents in the prior art include chromium, aldehyde, zirconium, etc., but chromium salts and aldehydes are highly toxic, and the crosslinking time is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] [Example 1] The cross-linking agent has the following components by weight percentage:

[0035] Zirconium oxychloride 15%, isopropanol 40%, lactic acid 20%, xylitol 10%, sodium gluconate 0.5%, and the balance is water.

[0036] The preparation method of the crosslinking agent of this embodiment: in parts by weight, in a four-necked reaction flask equipped with a reflux condensing device, add 14.5 parts of water, 15 parts of zirconium oxychloride, 40 parts of isopropanol, and feed nitrogen , heated to 55±1°C, and stirred for 2h. Stop the nitrogen flow, add 20 parts of lactic acid, 10 parts of xylitol, and 0.5 parts of sodium gluconate, continue to stir and react at 55±1°C for 2 hours, and neutralize the reaction product to pH 5 to obtain crosslinking agent 1.

Embodiment 2

[0038] As described in Example 1, the difference is that the weight percentage of sodium gluconate is 0.3%, to obtain the crosslinking agent 2.

Embodiment 3

[0040] As described in Example 1, the difference is that the weight percentage of sodium gluconate is 1.0%, namely to obtain the crosslinking agent 3.

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Abstract

The invention discloses a ground crosslinked acid crosslinking agent and a preparation method thereof. The crosslinking agent comprises 5-20% of zirconium oxychloride, 10-50% of a low molecular alcohol, 5-25% of alpha-hydroxy carboxylic acid, 5-25% of a polyol, 0.1-2.0% of a polyhydroxy carboxylate and the balance of water. The preparation method comprises dissolving the 5-20% of zirconium oxychloride in the balance of water, adding the low molecular alcohol, letting in nitrogen, heating up to 50-60 DEG C, reacting for 1.5h-2h, stopping nitrogen, adding the 5-25% of alpha-hydroxy carboxylic acid, the 5-25% of polyol and the 0.1-2% of polyhydroxy carboxylate, continuing to react for 1.5h-2h at 50-55 DEG C, neutralizing a reaction product to pH for 3-5 to obtain the crosslinking agent. The crosslinking agent can crosslink acrylamide polymers in an acid liquid with a high concentration to obtain acid containing gel with high viscosity, and is especially suitable for oilfield reservoir acid fracturing of 100-150 DEG C.

Description

technical field [0001] The invention relates to the field of exploration, in particular to a ground cross-linking acid cross-linking agent and a preparation method thereof. Background technique [0002] Acid fracturing is one of the important production stimulation measures for low-permeability reservoir stimulation to restore and improve the permeability of the formation and the productivity of oil and gas wells through the dissolution of acid. With the in-depth development of low-permeability reservoirs in my country, acid fracturing has been more and more widely used. [0003] The performance of the acid fluid plays a key role in the effect of acid fracturing. In order to obtain a better acid fracturing effect, the acid fracturing fluid has the following requirements: increase the penetration of acid, delay the reaction speed of acid rock, and increase the action distance of acid fluid , to maximize acid-etched fractures to obtain high conductivity fractures close to hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 赵晓张旭东张波张旭张保平姚奕明周健李洪春周林波
Owner CHINA PETROLEUM & CHEM CORP
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