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A slow-swelling nano-elastic microsphere deep profile control oil displacement agent and its preparation method

A technology of elastic microspheres and deep profile control, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of polymer microsphere profile control agent with too fast expansion rate, cumbersome preparation method, and low solid content , to achieve the effects of excellent elasticity, high effective solid content, and simple preparation method

Active Publication Date: 2018-09-21
BEIJING YIHAI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a slow-swelling nano-elastic microsphere deep profile control oil-displacement agent, its preparation method and oil field application, aiming to solve the problem of excessive expansion rate of the existing polymer microsphere profile control agent, cumbersome preparation method, Low solid content and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix 150g acrylamide, 40g acrylic acid, 2g N, N-methylenebisacrylamide and 200g deionized water, stir at room temperature to obtain mixed solution 1; mix 120g sorbitol glyceride, 40g octylphenol Polyoxyethylene ether is mixed with 320g diesel oil to obtain mixed solution 2.

[0029] (2) Add the mixed solution 1 into the mixed solution 2 at an emulsifying stirring speed of 1200 rpm, and emulsify at room temperature for 15 minutes. Reduce the stirring speed to 400 rpm, pass nitrogen gas to remove oxygen for 20 minutes, put the above mixed solution in a water bath at 10°C, add 5g of ammonium persulfate and 5g of sodium metabisulfite to initiate the polymerization reaction, and react at a constant temperature of 70°C for 4 hours.

[0030] (3) Dissolve 0.5g of aluminum citrate in 20g of water, add it to the microemulsion after polymerization, raise the temperature to 80°C and continue the reaction for 2 hours, then cool down to room temperature to obtain a transparent pro...

Embodiment 2

[0032] (1) Mix 150g acrylamide, 50g methacrylic acid, 2g N,N-methylene bisacrylamide and 220g deionized water, stir at room temperature to obtain mixed solution 1; mix 100g sorbitol glyceride, 40g Hydrobitan monooleate polyoxyethylene ether was mixed with 350g of liquid paraffin to obtain mixed solution 2.

[0033] (2) Add the mixed solution 1 into the mixed solution 2 at an emulsifying stirring speed of 1200 rpm, and emulsify at room temperature for 20 minutes. Reduce the stirring speed to 400 rpm, pass nitrogen gas to remove oxygen for 20 minutes, put the above mixed solution in a water bath at 10°C, add 4g of potassium persulfate and 4g of sodium metabisulfite to initiate the polymerization reaction, and react at a constant temperature of 70°C for 4 hours.

[0034] (3) Dissolve 0.2 g of chromium oxalate in 10 g of water, add it into the microemulsion after polymerization, raise the temperature to 80° C. and continue the reaction for 3 hours, then cool down to room temperatu...

Embodiment 3

[0036] (1) Mix 120g of acrylamide, 80g of sodium 2-acrylamido-2-methylpropanesulfonate, 1g of N,N-methylenebisacrylamide and 200g of deionized water, and stir at room temperature to obtain a mixed solution 1; 100 g of sorbitan trioleate, 50 g of sorbitan monooleate polyoxyethylene ether and 300 g of liquid paraffin were mixed to obtain a mixed solution 2.

[0037] (2) Add the mixed solution 1 into the mixed solution 2 at an emulsifying stirring speed of 1200 rpm, and emulsify at room temperature for 15 minutes. Reduce the stirring speed to 400 rpm, pass nitrogen gas to remove oxygen for 20 minutes, put the above mixed solution in a water bath at 10°C, add 5g of ammonium persulfate and 5g of sodium metabisulfite to initiate the polymerization reaction, and react at a constant temperature of 70°C for 4 hours.

[0038] (3) 0.15 g of zirconium citrate was dissolved in 10 g of water, added into the microemulsion after polymerization, continued to react at 70° C. for 2 hours, and co...

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Abstract

The invention discloses a preparation method and application of a dilatation-retarding nano elastic microsphere in-depth profile controlling and oil displacing agent. The preparation method includes: preparing mixed liquid 1; preparing mixed liquid 2; adding the mixed liquid 1 into the mixed liquid 2, emulsifying for 5-20 minutes at room temperature, lowering stirring speed to be 100-500rpm, feeding nitrogen to remove oxygen for 10-30minutes, adding 0.005-1% oxidant and 0.05-1% reductant serving as initiator, disposing the mixed liquid in water bath at temperature of 5-10 DEG C for inverse microemulsion polymerization which can be allowed to last for 2-6.5h; dissolving 0.005-1% microsphere surface modifier in 0.5-5% water, adding into microemulsion after polymerization is finished, continuing reaction for 2-5h at temperature of 60-80 DEG C, and cooling to room temperature to obtain the dilatation-retarding nano elastic microsphere in-depth profile controlling and oil displacing agent. Polymer elastic microspheres have dilatation retardancy, so that injection depth of the polymer microspheres can be increased effectively. The dilatation-retarding nano elastic microsphere in-depth profile controlling and oil displacing agent has excellent elasticity and good pressure-bearing effect.

Description

technical field [0001] The invention relates to the field of water plugging and profile control agents, in particular to a slow-swelling nano-elastic microsphere deep profile control and oil displacement agent and a preparation method thereof. Background technique [0002] At present, due to long-term water flooding and primary heterogeneity of reservoirs, "controlling water and stabilizing oil" has become an important task for various oilfields. In order to solve the problem of low-efficiency and ineffective circulation of water injection, various technical measures are usually used to improve the water absorption profile and expand the sweep coefficient. Water plugging and profile control technology has always been a very critical and effective means for oilfields to improve water injection development effects and achieve reservoir production increase. [0003] At present, traditional inorganic profile control agents are easy to precipitate and cannot enter deep formations...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F222/38C08F4/40C08F2/32C09K8/512C09K8/588
Inventor 郝翔
Owner BEIJING YIHAI ENERGY TECH CO LTD
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