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A kind of cross-linked polymer microsphere for profile control and preparation method thereof

A technology of cross-linked polymers and microspheres, which is applied in the direction of microsphere preparation, microcapsule preparation, drilling composition, etc., can solve the problems of low cost, affecting the migration depth of microspheres, and large demand for emulsifiers. Achieve the effect of low cost and suitable for promotion and use

Active Publication Date: 2021-07-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the existing problems in the preparation process of polymer microspheres for profile control: the demand for emulsifiers is large, the production cost is high, and the rate of water absorption and swelling is fast, and the multiple of water absorption and expansion is large, which affects the migration of microspheres in the reservoir Depth; the present invention provides a cross-linked polymer microsphere for profile control and its preparation method; compared with the existing polymer microsphere for profile control, the present invention has the following advantages: the microsphere structure contains hydrophobic structural units, The water swelling rate and water swelling ratio of the microspheres are controlled; water is used as the continuous phase in the preparation of the microspheres, and a large amount of emulsifier is not required, and the cost is low

Method used

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  • A kind of cross-linked polymer microsphere for profile control and preparation method thereof
  • A kind of cross-linked polymer microsphere for profile control and preparation method thereof
  • A kind of cross-linked polymer microsphere for profile control and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] At room temperature, dissolve 1gAES, 1.25g ammonium persulfate, 0.25g N,N′-methylenebisacrylamide, 6.25g acrylamide in 1000mL deionized water; Add 243.5g of styrene to it, raise the temperature to 70°C at the same time, and react for 5h; The transmission electron micrographs of cross-linked polymer microspheres are as follows: figure 1 As shown, it was determined that the average particle size at 25°C was 225.6nm.

Embodiment 2

[0020] At room temperature, dissolve 1gAES, 1.25g ammonium persulfate, 6.25g N,N′-methylenebisacrylamide, 6.09g acrylamide in 1000mL deionized water; g styrene was added to it, and the temperature was raised to 70°C at the same time, and the reaction was carried out for 5 hours; The transmission electron micrographs of the polymer microspheres are as follows: figure 2 As shown, the average particle diameter is 58.3nm at 25°C.

Embodiment 3

[0022] At room temperature, dissolve 7g of AES, 1.25g of ammonium persulfate, 6.25g of divinylbenzene, 5.09g of acrylamide, and 1g of 2-acrylamido-2-methylpropanesulfonate in 1000mL of deionized water; At 600 rpm, add 237.66g of styrene to it, raise the temperature to 75°C, and react for 4 hours; after the reaction, centrifuge the reaction solution at 6000 rpm, and the obtained solid is cross-linked polymerization for profile modification object microspheres. The transmission electron micrograph of the cross-linked polymer microspheres for profile control is as follows: image 3 As shown, it was determined that the average particle size at 25°C was 216.5nm.

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Abstract

The invention belongs to the field of enhanced oil recovery for oil and gas field development, and specifically relates to a cross-linked polymer microsphere for profile control and a preparation method thereof. The cross-linked polymer microsphere is composed of a hydrophobic monomer, a hydrophilic monomer and a cross-linking agent The three are prepared by emulsion polymerization; the average particle diameter of the cross-linked polymer microspheres is 50-1000nm, and the temperature is 25°C. The rate is 0.2~3nm / h. By reasonably controlling the dosage of hydrophobic monomers, hydrophilic monomers, cross-linking agents, emulsifiers and initiators, the particle size, water-absorbing expansion ratio and water-absorbing expansion rate of the microspheres can be adjusted. Cross-linked polymer microspheres have the disadvantages of fast water-absorbing swelling rate, large water-absorbing swelling multiple, and high production cost, so they have broad application prospects in the field of deep profile control in low-permeability reservoirs.

Description

technical field [0001] The invention belongs to the field of enhanced oil recovery in oil and gas field development. The invention can also be used in the fields of drilling fluid fluid loss reduction, coating, medicine, separation and purification, and specifically relates to a cross-linked polymer microsphere for profile control and a preparation method thereof. Background technique [0002] Due to the increasing domestic consumption of oil and gas resources year by year, coupled with the gradual depletion of conventional oil and gas reservoir resources, my country's dependence on foreign oil and gas resources has risen sharply. As of 2018, my country's dependence on foreign oil has exceeded 70%. The foreign dependence of oil and gas resources will exceed 80%. Facing such a severe situation, how to ensure the healthy and stable development of the national oil and gas strategic reserves and the oil industry is imminent. [0003] Low permeability reservoirs are an important ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/56C08F222/38C08F212/36C08F220/58C08F220/14C08F220/06B01J13/14C09K8/512C09K8/88
CPCB01J13/14C08F212/08C08F220/14C09K8/512C09K8/887C08F220/56C08F222/385C08F220/06
Inventor 贺杰
Owner SOUTHWEST PETROLEUM UNIV