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Core-shell polymer microsphere profile control and oil displacement agent and preparation method thereof

A technology for adjusting the displacement agent and polymer, which is applied in the field of the core-shell polymer microspheres for adjusting the displacement agent, which can solve the problems that the displacement adjusting agent cannot really reach the deep formation, cannot realize slug treatment, and is difficult to prepare and inject. Solve the effect of difficult control of gel-forming conditions, strong resistance to salinity, and improved recovery

Inactive Publication Date: 2012-06-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: for the situation that weak gel is difficult to gel and HPAM has poor stability under harsh oil reservoir conditions, it is difficult to prepare and inject, it is impossible to realize slug treatment, it has poor temperature and salt resistance and It is difficult for conventional gel particle control and displacement agents to reach deep formations and other technical problems. A core-shell polymer microsphere control and displacement agent and its preparation method are specially provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Example one : Add cross-linking agent 1 N,N'-methylenebisacrylamide 0.00010g and acrylamide 2g into a three-necked bottle with 78g deionized water, after dissolving, add cross-linking agent 2 divinylbenzene 0.00005g and 20g of styrene, heated up to 70°C, protected by nitrogen, added 0.5g of ammonium persulfate as an initiator, controlled the stirring rate at 350rpm, and reacted for 7h to obtain a core-shell emulsion product. The particle size was measured by a laser particle size analyzer. 347nm. The polymer emulsion was separated by centrifugal demulsification, washed and purified three times with absolute ethanol, and the product was obtained after vacuum drying. Infrared analysis showed that the intensity ratio of acrylamide unit and styrene unit in the copolymerized microspheres was 0.62, which can be qualitatively explained. The ratio of the numbers of the two units in . At a temperature of 110°C, the degree of salinity is 10×10 4 mg / L NaCl+5×10 3 In the case o...

example 2

[0015] Example two : Add cross-linking agent 1 N,N'-methylenebisacrylamide 0.00010g and acrylamide 5g into a three-necked bottle with 76g of deionized water, after dissolving, add cross-linking agent 2 divinylbenzene 0.00005g and styrene 19g, heat up to 70°C, keep nitrogen protection, add 0.2g of initiator ammonium persulfate, control the stirring speed at 350rpm, and react for 7h to obtain a core-shell emulsion product, and use a laser particle size analyzer to measure the particle size 330nm. The polymer emulsion was separated by centrifugal demulsification, washed and purified three times with absolute ethanol, and the product was obtained after vacuum drying. Infrared analysis showed that the intensity ratio of sodium acrylate unit and p-phenylstyrene unit in the copolymerized microspheres was 0.79, which can be qualitatively explained The ratio of the number of two units in the copolymerized microsphere. At a temperature of 130°C, the degree of salinity is 10×10 4 mg / ...

example 3

[0016] Example three : Add 0.00005 g of cross-linking agent 1 N,N'-methylenebisacrylamide and 4 g of sodium 2-acrylamide-2-methylpropanesulfonate into a three-necked bottle with 78 g of deionized water. , then add 0.00005 g of cross-linking agent 2 divinylbenzene and 18 g of styrene, raise the temperature to 70 ° C, keep nitrogen protection, add 0.1 g of initiator ammonium persulfate, control the stirring speed at 350 rpm, and react for 7 hours to obtain a core-shell emulsion Type product, the particle size measured by laser particle size analyzer is 315nm. The polymer emulsion is separated by centrifugal demulsification, washed and purified three times with absolute ethanol, and the product is obtained after vacuum drying. Infrared analysis can obtain the content of 2-acrylamide-2-methylpropanesulfonate unit and propylene styrene unit in the copolymerized microspheres. The intensity ratio is 0.71, which can qualitatively explain the ratio of the two units in the copolymeriz...

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Abstract

The invention relates to a core-shell polymer microsphere profile control and oil displacement agent for oil reservoir profile control and displacement and increase of water drive recovery factor and a preparation method of the core-shell polymer microsphere profile control and oil displacement agent, which can solve the technical problems of difficulty in injection and poor temperature resistance and salt resistance. The invention adopts a technical scheme as follows: the profile control and oil displacement agent is made from the following raw materials in parts: 15 to 20 of a hydrophobic monomer (such as styrene or a styrene derivative or an acrylate ester), 2 to 10 of a hydrophilic monomer (such as acrylic acid or an acrylate salt or acrylamide), 60 to 85 of deionized water, divinylbenzene as core-phase cross-linking agent, N,N'-methylene-bis-acrylamide as shell-phase cross-linking agent, and a sulfate salt as initiator. The method comprises the following steps of: adding the shell-phase cross-linking agent and acrylic acid into a three-necked flask with water, adding the core-phase cross-linking agent and styrene after dissolving completely, introducing nitrogen gas (30 DEG Cto 75 DEG C), adding the initiator, and allowing reactions to take place for 6 to 8 hours under stirring, to obtain the polymer microsphere profile control and oil displacement agent. The polymer microsphere profile control and oil displacement agent is suitable for middle / low-permeability oil reservoirs, can be applied to high-permeability oil reservoirs in combination with other profile controlagents, and can greatly increase the crude oil recovery ratio.

Description

technical field [0001] The invention relates to a core-shell type polymer microsphere control and drive agent used for control and displacement of high-temperature and high-salt oil reservoirs in petroleum industry oilfields and for improving water drive recovery and a preparation method thereof. Background technique [0002] After water flooding, the high-permeability layer or high-permeability zone has strong water absorption capacity and high oil displacement efficiency, while the low-permeability layer or low-permeability zone has weak water absorption capacity, and the oil has not started or the degree of oil production is very low. To increase the recovery factor, it is necessary to improve the mobility ratio and improve the water sweep efficiency. Use appropriate profile control agent to adjust the water absorption profile of the high-low permeability layer or high-low permeability zone, so that the water absorption capacity of the high-permeability layer or high-perm...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F222/38C08F220/56C08F212/08C08F212/36C08F220/58C08F220/54C08F212/12C08F220/06C08F226/02
Inventor 周明王煦赵金洲
Owner SOUTHWEST PETROLEUM UNIV
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