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Slow-expansion polymer micro-balloon deep oil displacement and profile control agent and preparation method thereof

A technology for adjusting displacement agent and polymer, which is applied in the field of deep displacement adjusting agent and preparation of slow-expanding polymer microspheres. The effect of difficult-to-control gel-forming conditions

Inactive Publication Date: 2015-12-09
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 to provide a slow-moving agent to solve the technical problems of the current particle control and drive agent, such as complex process and poor injectability, and the polymer microsphere control and drive agent is easy to absorb water and swell in low minerality reservoirs, and it is difficult to really reach the deep part of the formation. Expansion polymer microsphere deep control and drive agent and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: In a three-necked bottle equipped with 65g of deionized water, add 1.5g of sodium lauryl sulfate as an emulsifier and 0.5g of OP-10 as a co-emulsifier. After fully dissolving, add 33g of formazan Methyl acrylate, fully emulsified, then add 0.10g cross-linking agent divinylbenzene, heat up to 40°C, protect with nitrogen, add initiator potassium persulfate and sodium bisulfite each 0.02g, stirring speed is 400rpm, React for 5 hours to prepare slow-swelling cross-linked polymer emulsion microspheres, and obtain slow-swelling polymer microspheres with an average particle size of 100nm as a deep control agent emulsion; the polymer emulsion generally does not need to be separated, and it is directly diluted to the required concentration. Inject into the formation for control and flooding.

[0014] At formation temperature 90°C and at formation salinity 1×10 4 mg / LNaCl+0.5×10 3 mg / LNaHCO 3 In the case of different conditions, keep the particles diluted to the req...

example 2

[0017] Example 2: In a three-neck bottle filled with 60g of deionized water, add 2g of sodium lauryl sulfate as an emulsifier and 1g of OP-10 as a co-emulsifier, and after it is fully dissolved, add 37g of methacrylic acid After fully emulsifying tert-propyl ester, add 0.05g of cross-linking agent divinylbenzene, heat up to 50°C, protect with nitrogen gas, add 0.1g of initiator potassium persulfate, stir at 400rpm, react for 6h, and obtain slow expansion Cross-link polymer emulsion microspheres to obtain a slow-swelling polymer microsphere deep control and flooding agent emulsion with an average particle size of 120nm; the polymer emulsion generally does not need to be separated, and is diluted to the required concentration and directly injected into the formation for control and flooding.

[0018] At formation temperature 90°C and at formation salinity 1×10 4 mg / LNaCl+0.5×10 3 mg / LNaHCO 3 In the case of different conditions, keep the particles diluted to the required concen...

example 3

[0021] Example 3: In a three-necked bottle filled with 68.5g of deionized water, add 1g of sodium lauryl sulfate as the emulsifier and 0.5g of OP-10 as the co-emulsifier. After fully dissolving, add 20g of acrylic acid Methyl ester and 10g n-butyl methacrylate, fully emulsified, then add 0.15g cross-linking agent divinylbenzene, heat up to 70°C, protect with nitrogen, add initiator potassium persulfate and sodium bisulfite 0.01g each , stirring speed is 350rpm, reacts 4h, makes slow-swelling cross-linked polymer emulsion microspheres, obtains the slow-swelling polymer microspheres deep regulation and drive agent emulsion of average particle diameter 180nm; This polymer emulsion generally does not need to separate, dilutes to Inject directly into the formation at the required concentration for regulating and flooding.

[0022] At formation temperature 90°C and at formation salinity 1×10 4 mg / LNaCl+0.5×10 3 mg / LNaHCO 3 In the case of different conditions, keep the particles d...

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Abstract

The invention relates to a slow-expansion polymer micro-balloon deep oil displacement and profile control agent for oil reservoir deep oil displacement and profile control to improve the recovery efficiency, and a preparation method thereof. The technical problems that particles are difficult to inject and micro-balloons can hardly reach stratum deep places directly can be solved. According to the technical scheme, the oil displacement and profile control agent is prepared from 30-40 g of hydrophobic monomer, 60-70 g of deionized water, emulsifier, co-emulsifier, cross-linking agent and initiator, wherein the hydrophobic monomer is formed by methyl acrylate or methyl methacrylate or one or two of homologs of methyl acrylate and methyl methacrylate, lauryl sodium sulfate serves as emulsifier, OP-10 serves as co-emulsifier, divinyl benzene serves as cross-linking agent, and persulfate serves as initiator. In a water-containing three-necked bottle, emulsifier and co-emulsifier are added to be fully dissolved; methyl acrylate is added to be fully emulsified, cross-linking agent is added, then the temperature is raised to be 40 DEG C to 75 DEG C, nitrogen is introduced for protection, initiator is added, a reaction is conducted for 4 h to 6 h, and the slow-expansion polymer micro-balloon deep oil displacement and profile control agent is prepared. The slow-expansion polymer micro-balloon deep oil displacement and profile control agent is suitable for middle-low permeability reservoirs, and the crude oil recovery efficiency can be greatly improved.

Description

technical field [0001] The invention relates to a slow-swelling polymer microsphere deep control and drive agent and a preparation method thereof, which are used for deep control and drive of oil reservoirs to enhance recovery. 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-permeability zone is reduced, and the water absorption capacity of the low...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F212/36C08F220/18C09K8/588
Inventor 周明李丝丝张泽王成文罗刚
Owner SOUTHWEST PETROLEUM UNIV
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