Anionic polyacrylamide water-in-water emulsion water shutoff profile control agent, and preparation method and using method thereof

A polyacrylamide, water-in-water emulsion technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of long dissolution time, high energy consumption, too fast cross-linking time, etc.

Active Publication Date: 2015-03-25
SHENGLI OILFIELD SHENGLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their respective jelly systems still have the following defects as water plugging and profile control agents: ① Anionic polyacrylamide in the form of dry powder includes drying, crushing, granulation and other steps in the production process, so the energy consumption is high, and it needs to be used in field application Larger dissolving devices and longer dissolving time restrict the application of dry powder products, especially in some specific fields with narrow production and operation space, such as water plugging and profile control in offshore oil fields, and small oil production platforms The area cannot accommodate a larger dissolving device; ②The water-in-oil emulsion has

Method used

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  • Anionic polyacrylamide water-in-water emulsion water shutoff profile control agent, and preparation method and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 108.8g of deionized water, 32.4g of acrylamide, 44g of ammonium sulfate, 5.58g of acrylic acid, 10g of stabilizer, and 0.02g of EDTA into a 250mL four-neck flask equipped with stirring, nitrogen tube, and thermometer, and start stirring at a stirring speed of 200 rpm / min, add 8g of anhydrous sodium sulfate, and adjust the pH value of the system to 7 with sodium hydroxide solution. Raise the temperature to 30°C, pass nitrogen for 30 minutes, then add 0.013g of sodium bisulfite, and then add 0.025g of ammonium persulfate after 5 minutes, the reaction starts in about 15 minutes, and the viscosity of the system increases as the reaction progresses. To a certain extent, add 5g of ammonium sulfate and 5g of anhydrous sodium sulfate. Viscosity gradually decreased, and the system was milky white. When kept at 45°C for 12 hours, a milky white emulsion with rotational viscosity of 280mPa·s was obtained. In 1mol / L sodium chloride aqueous solution, its intrinsic viscosity was ...

Embodiment 2

[0029] Add 108.8g of deionized water, 32.4g of methacrylamide, 44g of ammonium sulfate, 5.58g of acrylic acid, 10g of stabilizer, and 0.02g of EDTA into a 250mL four-neck flask equipped with a stirring, nitrogen tube, and thermometer. 200 rpm, add 8g of anhydrous sodium sulfate, and adjust the pH value of the system to 7 with sodium hydroxide solution. Raise the temperature to 30°C, pass nitrogen for 30 minutes, then add 0.013g of sodium bisulfite, and then add 0.025g of ammonium persulfate after 5 minutes, the reaction starts in about 15 minutes, and the viscosity of the system increases as the reaction progresses. To a certain extent, add 5g of ammonium sulfate and 5g of anhydrous sodium sulfate. Viscosity gradually decreased, and the system was milky white. When kept at 45°C for 12 hours, a milky white emulsion with rotational viscosity of 315mPa·s was obtained. In 1mol / L sodium chloride aqueous solution, its intrinsic viscosity was 385mL / g.

Embodiment 3

[0031] Add 108.8g of deionized water, 32.4g of acrylamide, 44g of ammonium sulfate, 2.88g of acrylic acid, 2.7g of 2-acrylamido-2-methylpropane into a 250mL four-necked flask equipped with stirring, nitrogen tube, and thermometer Sulfonic acid, 10g stabilizer, 0.02g EDTA start stirring, stirring speed 200 rpm, add 8g anhydrous sodium sulfate, adjust the pH value of the system to 7 with sodium hydroxide solution. Raise the temperature to 30°C, pass nitrogen for 30 minutes, then add 0.013g of sodium bisulfite, and then add 0.025g of ammonium persulfate after 5 minutes, the reaction starts in about 15 minutes, and the viscosity of the system increases as the reaction progresses. To a certain extent, add 5g of ammonium sulfate and 5g of anhydrous sodium sulfate. The viscosity gradually decreased, and the system was milky white. When it was kept at 45°C for 12 hours, a milky white emulsion with a rotational viscosity of 360mPa·s was obtained. In 1mol / L sodium chloride aqueous solut...

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Abstract

The invention discloses an anionic polyacrylamide water-in-water emulsion water shutoff profile control agent, and a preparation method and a using method thereof. The anionic polyacrylamide water-in-water emulsion water shutoff profile control agent consists of an anionic polyacrylamide water-in-water emulsion and a cross-linking agent. The preparation method comprises the following steps: adding deionized water, a stabilizing agent, part inorganic salts, nonionic monomers, anionic monomers, a chelating agent and (a chain transfer agent) into a reaction container, stirring uniformly, adjusting the pH value to a suitable range, introducing nitrogen to remove oxygen, adding an initiator to initiate a reaction, adding the remaining part inorganic salts in a reaction process, preserving heat, and discharging materials to obtain the anionic polyacrylamide water-in-water emulsion. The using method of the anionic polyacrylamide water-in-water emulsion serving as a water shutoff profile control agent comprises the following steps: diluting the water-in-water emulsion on situ or on line to prepare a uniform aqueous solution with a certain concentration, adding a certain amount of the cross-linking agent under the condition of stirring, stirring uniformly and injecting the aqueous solution into a stratum to realize the purpose of improving crude oil recovery rate.

Description

technical field [0001] The invention relates to the technical field of profile control and water shutoff in petroleum exploitation, in particular to an anionic polyacrylamide water-in-water emulsion water shutoff profile control agent and its preparation method and usage. Background technique [0002] Water plugging refers to the use of mechanical or chemical methods to limit or reduce the water production capacity of the water-producing layer / section of the production well, so as to exert the oil production potential of the oil-bearing layer / section, so as to achieve the purpose of reducing the water content of the oil well and increasing the crude oil production. Its work The object is an oil well. Profile control refers to the use of mechanical or chemical methods to limit or reduce the water absorption capacity of high-permeability layers / sections of water injection wells, so as to improve the water absorption profile of water injection wells, and then improve the swept ...

Claims

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Application Information

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IPC IPC(8): C09K8/512C08F220/56C08F220/06C08F220/58
CPCC08F4/40C08F220/56C09K8/512C08F220/06C08F220/585
Inventor 张云山冯玉军王勇吕永利胡华玮
Owner SHENGLI OILFIELD SHENGLI CHEM
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