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A volume expandable material swelled by carbon dioxide and water, and a preparation method thereof and a method for improving CO2 huff and puff effect

A water-expanding, carbon dioxide technology, applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of fast water-absorbing expansion and high cost of cationic monomers, reducing seepage capacity and improving oil recovery. , the effect of expanding the scope of

Active Publication Date: 2019-06-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent document CN1464007A discloses a heat-resistant and salt-resistant water-absorbing resin, which is synthesized by ternary copolymerization of acrylic acid, acrylamide, and cationic monomers and adding inorganic fillers.

Method used

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  • A volume expandable material swelled by carbon dioxide and water, and a preparation method thereof and a method for improving CO2 huff and puff effect
  • A volume expandable material swelled by carbon dioxide and water, and a preparation method thereof and a method for improving CO2 huff and puff effect
  • A volume expandable material swelled by carbon dioxide and water, and a preparation method thereof and a method for improving CO2 huff and puff effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 100g of water to a 250mL reaction vessel, add 30g of acrylamide, 3g of acrylic acid, 2g of 2-acrylamido-methylpropanesulfonic acid, 0.1g of N,N-methylenebisacrylamide, and sodium hydroxide under stirring conditions 0.4g, 0.2g of ammonia water to dissolve; then add 60g of natural rubber latex, stir until it is evenly dispersed; then add 1g of 5% ammonium persulfate aqueous solution, 1g of 5% sodium bisulfite aqueous solution, and stir evenly; Afterwards, the reaction vessel was sealed, put into a constant temperature oven at 50° C. for polymerization reaction for 5 hours, and the obtained rubber blocks were cut into small pieces, vacuum dried, and pulverized to obtain material A.

Embodiment 2

[0039] Add 100g of water into a 250mL reaction vessel, add 35g of acrylamide, 3g of acrylic acid, 0.08g of N,N-methylenebisacrylamide, 0.9g of sodium carbonate, and 0.3g of ammonia water under stirring conditions to dissolve it; then add natural Latex 80g, stir until it is uniformly dispersed; then add 1.2g of 5% ammonium persulfate aqueous solution and 1.2g of 5% sodium bisulfite aqueous solution, and stir evenly; airtight the reaction vessel after deoxygenating with nitrogen gas, and put it in a constant temperature oven at 40°C The medium polymerization reaction was carried out for 6 hours, and the obtained rubber block was cut into small pieces, dried in vacuum and pulverized to obtain material B.

Embodiment 3

[0041] Add 100g of water into a 250mL reaction vessel, add 35g of acrylamide, 3g of acrylic acid, 0.08g of N,N-methylenebisacrylamide, 0.9g of sodium carbonate, and 0.3g of ammonia water under stirring conditions to dissolve it; then add natural Latex 55g, stir until it is uniformly dispersed; then add 1.2g of 5% ammonium persulfate aqueous solution and 1.2g of 5% sodium bisulfite aqueous solution, and stir evenly; airtight the reaction vessel after deoxygenation with nitrogen gas, and put it in a constant temperature oven at 30°C After 7 hours of medium polymerization, the obtained rubber block was cut into small pieces, dried in vacuum and crushed to obtain material C.

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Abstract

The invention provides a carbon-dioxide-swellable water-expansible expandable material, a preparation method thereof and a method of improving CO2 huff-puff effect by the expandable material; the expandable material is prepared by polymerizing, by weight, 100 parts of water, 20-60 parts of a monomer, 0.05-0.15 part of an initiator, 0.03-0.15 part of a crosslinking agent, 40-100 parts of a CO2-philic component, and 0.2-4 parts of an aid; the monomer is selected from one or any of acrylamide, sodium acrylate, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid, the crosslinking agent is N,N-methylenebisacrylamide, the initiator is a redox system initiator, the CO2-philic component is natural latex, and the aid is an inorganic alkali. By using the expandable material and preparation and application methods thereof, it is possible to expand the coverage of a CO2 puff process, crude oil uncovered originally is brought out, crude oil recovery rate is increased, and CO2 huff-puff effect is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum development, more specifically, to a body-expanding material that swells when encountering carbon dioxide and water, and a preparation method thereof and a method for improving CO 2 The method of throughput effect. Background technique [0002] Carbon dioxide huff and puff means that after a certain amount of carbon dioxide is injected into the bottom layer from the oil casing annulus of the oil well, after a period of well soaking, the carbon dioxide fully diffuses into the oil layer during this period, and the crude oil is easy to be extracted through the reduction of crude oil viscosity and volume expansion. . During oilfield development, CO 2 Throughput is one of the effective measures to increase production, and has been widely used at home and abroad. Patent document CN104453812A discloses a method for increasing production by acidification after carbon dioxide huff and puff. Patent do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F253/00C08F220/56C08F220/06C08F220/58C08F222/38E21B43/16
CPCC08F253/00E21B43/164C08F220/56
Inventor 马涛王友启许关利赵淑霞王海波王强郑惠光海玉芝崔茂蕾刘平
Owner CHINA PETROLEUM & CHEM CORP
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