High-temperature-resistant crosslinking acid liquor system as well as preparation method thereof

A cross-linking acid and system technology, applied in chemical instruments and methods, mining fluids, earth-moving drilling, etc., can solve the problems of poor high temperature resistance, high cost, and large amount of cross-linking agent in the cross-linked acid system. Improve stable cross-linking performance and temperature resistance, low cost, stable release effect

Active Publication Date: 2015-03-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the existing cross-linking acid liquid system, such as large amount of cross-linking agent, high cost, and poor high-temperature re...

Method used

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  • High-temperature-resistant crosslinking acid liquor system as well as preparation method thereof
  • High-temperature-resistant crosslinking acid liquor system as well as preparation method thereof
  • High-temperature-resistant crosslinking acid liquor system as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: the synthesis (1) of polymer thickener

[0042] Add 23g of acrylamide monomer, 17g of methacryloyloxyethyltrimethylammonium chloride, 3g of urea, and 57g of deionized water into a flask equipped with a stirrer and a thermometer, shake evenly to make the components fully miscible, Put it into ice water to cool, start nitrogen, add 0.003g polyethylene glycol diacrylate and 0.04g K after 45min 2 S 2 o 8 -NaHSO 3 After the addition, the nitrogen flow was stopped, the container was taken out from the water bath and the lid was closed, and the reaction was allowed to stand at room temperature for 8 hours. Precipitate and wash the synthesized copolymer with absolute ethanol, then suction filter to obtain a solid reactant, put it in a vacuum drying oven and dry it at low temperature (40°C) for 24 hours to obtain a thickener, and obtain the desired acrylamide-methacrylic acid Acyloxyethyltrimethylammonium chloride copolymer (molecular weight 8 million-12 millio...

Embodiment 2

[0044] Embodiment 2: the synthesis (2) of polymer thickener

[0045] Add 23.5g of acrylamide monomer, 16.5g of methacryloyloxyethyltrimethylammonium chloride, 4g of urea, and 56.5g of deionized water into a flask equipped with a stirrer and a thermometer, shake evenly to make each component fully Miscible, put into ice water to cool, start nitrogen, add 0.004g polyethylene glycol diacrylate and 0.05g K after 40min 2 S 2 o 8 -NaHSO 3 After the addition, the nitrogen flow was stopped, the container was taken out from the water bath and the lid was closed, and the reaction was allowed to stand at room temperature for 9 hours. Precipitate and wash the synthesized copolymer with absolute ethanol, then suction filter to obtain a solid reactant, put it in a vacuum drying oven and dry it at low temperature (38°C) for 24 hours to obtain a thickener, and obtain the desired acrylamide-methacrylic acid Acyloxyethyltrimethylammonium chloride copolymer (molecular weight 10 million-11 mi...

Embodiment 3

[0047] Embodiment 3: the synthesis (3) of polymer thickener

[0048] Add 24g of acrylamide monomer, 16g of methacryloyloxyethyltrimethylammonium chloride, 3.5g of urea, and 56g of deionized water into a container with a rubber stopper, shake evenly to make the components fully miscible, and put Cool in ice water, start nitrogen, add 0.005g polyethylene glycol diacrylate and 0.06g K after 35min 2 S 2 o 8 -NaHSO 3 After the addition, the nitrogen flow was stopped, the container was taken out from the water bath and the lid was closed, and the reaction was allowed to stand at room temperature for 9 hours. Precipitate and wash the synthesized copolymer with absolute ethanol, then suction filter to obtain a solid reactant, put it in a vacuum drying oven and dry it at low temperature (35°C) for 24 hours, and finally pulverize it with a pulverizer to obtain a powdery thickener. Obtain required acrylamide-methacryloxyethyltrimethylammonium chloride copolymer (molecular weight 8,00...

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Abstract

The invention relates to a high-temperature-resistant crosslinking acid liquor system as well as a preparation method thereof. The system is prepared from the following components in percentage by mass: 20% of hydrochloric acid (based on pure hydrogen chloride), 1% of a polymer thickener, 0.3% of an organic metal cross-linking agent chelated titanium cross-linking agent and the balance of water; the preparation method comprises the following steps: adding quantitative thickener into a hydrochloric acid solution at normal temperature; quickly stirring till being fully dissolved; then, performing standing for 2-4 hours to obtain a uniform viscous liquid; finally adding the organic metal cross-linking agent and uniformly stirring. The system provided by the invention is less in use level of chelated titanium cross-linking agent, low in cost and good in stability, and no precipitates occur after being placed for a long time. The obtained high-temperature cross-linking acid liquor is crosslinked under a strong acid environment to form a jelly which can be picked up, and moreover, the obtained high-temperature-resistant crosslinking acid liquor system can resist a high temperature of 190 DEG C and can be used for acid fracturing production increase of a carbonatite oil and gas reservoir at 160-190 DEG C.

Description

technical field [0001] The invention relates to the technical field of oil field reservoir transformation, in particular to a high temperature resistant cross-linked acid liquid system for acid fracturing and a preparation method thereof. Background technique [0002] Acid fracturing is the main technological measure for increasing production and injection of carbonate rock oil and gas layers. In acid fracturing construction, acid liquid or prefluid is injected into the formation at a flow rate greater than the absorption capacity of the formation to rupture the formation and form cracks. Dissolves crack walls. Because the acid solution dissolves in a non-uniform manner, the flow path can still be maintained when the fracture is closed, thereby achieving the purpose of increasing production. This technology has generally been highly valued at home and abroad, and it provides a strong guarantee for the economical and efficient exploitation of oil and gas resources. In the p...

Claims

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Application Information

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IPC IPC(8): C09K8/74E21B43/27
Inventor 王彦玲刘飞马收吕永利金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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