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Cross-linked acid cross-linking agent and preparation method thereof

A technology of cross-linking agent and cross-linking acid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor permeability around cracks, increased filling degree, etc., so as to increase the effective distance of action and reduce the reaction Speed, the effect of increasing single well production

Active Publication Date: 2013-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the increase of the filling degree, the permeability around the fracture is poor, the stimulation effect is not ideal, and it is difficult to greatly increase the single well production

Method used

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  • Cross-linked acid cross-linking agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 150 grams of ethyl pyrrolidinol into a container with a stirrer and a condensing reflux device, start the stirrer, slowly add 40 grams of complex kinase, heat to 50 ° C and stir for 30 minutes, then add 0.3 moles of organic base to keep the After reacting at 70°C for 4 hours, cool to 60°C and add 1.6 moles of organic acid and 100 g of ethanol in sequence to form an orange-yellow homogeneous liquid, and react for 30 minutes to become the cross-linking acid cross-linking agent.

Embodiment 2

[0024] Add 150 grams of ethylpyrrolidine into a container with a stirrer and a condensing reflux device, start the stirrer, slowly add 150 grams of complex kinase, heat to 50 ° C and stir for 30 minutes, then add 1.3 molar parts of organic base to keep the After reacting at 70°C for 4 hours, cool to 60°C and add 3.3 moles of organic acid and 100 g of ethanol in sequence to form an orange-yellow homogeneous liquid, and react for 30 minutes to become the crosslinking acid crosslinking agent.

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Abstract

The invention relates to a cross-linked acid cross-linking agent and a preparation method thereof. The cross-linked acid cross-linking agent is prepared by reacting 150g of ethylpyrrolidinol, 40 to 150g of composite kinase, 0.3 to 1.3 mole of organic alkali, 1.6 to 3.3 mole of organic acid and 100g of ethanol serving as raw materials. The preparation method comprises the following steps of: adding the composite kinase into the ethylpyrrolidinol with heating and stirring, heating to 50 DEG C and stirring for 30 minutes; adding the organic alkali with stirring, heating to 70 DEG C, and reacting for 4 hours; adding the organic acid, the ethanol and water with stirring to form homogeneous liquid; and reacting for 30 minutes at the temperature of 60 DEG C. The cross-linked acid cross-linking agent can be used in a strongly acidic environment, can form fracturing fluid with a thickening agent in the presence of strong acid, reduces the reaction speed of an acid rock, prolongs the effective action distance of the acid liquid, generates an acid etched-supporting composite crack with high flow conductivity while carrying sand at the same time, and prolongs a validity period after fracture so as to improve the yield of a single well.

Description

Technical field: [0001] The invention relates to a cross-linking acid cross-linking agent and a preparation method thereof. The cross-linking agent can be cross-linked with a thickener dissolved and dispersed in acid to form a jelly. Background technique: [0002] During the development of the Lower Paleozoic carbonate reservoirs in the Changqing Gas Field, the modification technology has been greatly developed, and a series of effective reservoir modification technologies have been formed, which have made important contributions to the stable and increased production of the gas field. Contribution: For reservoirs with relatively good physical properties, acid fracturing is used for stimulation; for low-permeability tight reservoirs, sand fracturing is used for stimulation; however, with the continuous expansion of production and construction scale, the geological conditions of gas fields are becoming more and more complex. The proportion of tight reservoirs is increasing ye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/64
Inventor 谢璇杜彪杨海燕苗林王俊旭万华程芳李强
Owner PETROCHINA CO LTD
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