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Cross-linked polymer microsphere as well as preparation method and application thereof

A technology of cross-linked polymers and polymers, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of weak shear resistance and poor deep plugging performance, and achieve enhanced plugging performance and improved Moderate effect of shear resistance and water expansion ratio

Active Publication Date: 2020-12-11
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of weak shear resistance and poor deep plugging performance of existing polymer microspheres for profile control, the present invention provides a cross-linked polymer microsphere and a preparation method thereof. The cross-linked polymer microsphere prepared by the present invention The ball has strong shear resistance, moderate water expansion rate and water expansion multiple

Method used

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  • Cross-linked polymer microsphere as well as preparation method and application thereof
  • Cross-linked polymer microsphere as well as preparation method and application thereof
  • Cross-linked polymer microsphere as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, preparation cross-linked polymer microsphere

[0049] Step 1: At room temperature, add 12 parts of acrylamide, 5 parts of 2-acrylamide-2-methallyl sulfonic acid and 3 parts of stearyl acrylate to 40 parts of deionized water, and stir at 300r / min for 15min Until it is uniform, then add 0.1 part of bisphenol propane and 0.05 part of formaldehyde, stir at 300r / min for 15min until uniform, then add 0.4 part of potassium persulfate, stir for 15min at 300r / min until uniform, and obtain the water phase .

[0050] Step 2: Add 14 parts of Span80 to 80 parts of 10# white oil, raise the temperature to 50°C, stir for 45min, then cool down to 30°C to obtain the oil phase.

[0051] Step 3: Add the oil phase in step 2 into a three-necked flask, connect the reflux condensing device, pass nitrogen for 30 minutes, set the temperature of the water bath at 30°C, and stir at a speed of 450r / min, then add the water phase in step 1 dropwise with a constant pressure separating f...

Embodiment 2

[0054] Embodiment 2, preparation cross-linked polymer microsphere

[0055] Step 1: At room temperature, add 12 parts of acrylamide, 5 parts of 2-acrylamide-2-methallyl sulfonic acid and 3 parts of stearyl acrylate to 40 parts of deionized water, and stir at 300r / min for 15min until Uniform, then add 0.1 part of bisphenol propane and 0.05 part of formaldehyde, stir at 300r / min for 15min until uniform, then add 0.4 part of azobisisobutyronitrile, stir at 300r / min for 15min until uniform, get water box;

[0056] Step 2: Add 14 parts of Span60 to 80 parts of 10# white oil, raise the temperature to 50°C, stir for 45 minutes, then cool down to 30°C to obtain the oil phase;

[0057] Step 3: Add the oil phase in step 2 into a three-necked flask, connect the reflux condensing device, pass nitrogen for 30 minutes, set the temperature of the water bath at 30°C, and stir at a speed of 450r / min, then add the water phase in step 1 dropwise with a constant pressure separatory funnel , emul...

Embodiment 3

[0067] 1. Microsphere water swelling experiment

[0068] Take PAM microspheres and the dry powder of cross-linked polymer microspheres in Example 1 or 2 to prepare 3000mg / L deionized aqueous solution, pour them into 20mL sealed glass bottles, place them in a constant temperature oven at 55°C, and take them out after swelling for 5 days , the diameter of the microspheres before and after swelling was measured by SEM to calculate the swelling ratio of the microspheres.

[0069] 2. Microsphere shear performance experiment

[0070] Take PAM microspheres and the dry powder of cross-linked polymer microspheres in Example 1 or 2 to prepare 3000mg / L deionized aqueous solution. At room temperature, they are respectively injected at a rate of 1mL / min to carry out long core displacement experiments. The core penetration The ratio is 2500-3000mD, and the morphology changes before and after the microsphere displacement are measured by SEM.

[0071] 3. Results and discussion

[0072] fi...

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Abstract

The invention discloses a cross-linked polymer microsphere as well as a preparation method thereof. The cross-linked polymer microsphere is prepared by adopting an inverse emulsion method, and the preparation method comprises the following steps: by taking an aqueous solution of a polymer monomer, an initiator and a cross-linking agent as an aqueous phase, adding an oil phase containing an emulsifier into the aqueous phase, stirring to form an emulsion taking oil as an external phase, and reacting to obtain the cross-linked polymer microsphere. The polymer monomer is a mixture of acrylamide, 2-acrylamide-2-methyl propanesulfonic acid and octadecyl acrylate in a mass ratio of 6:(0-3):(1-2), and the cross-linking agent is bisphenol propane and formaldehyde in a mass ratio of (1.5-2):1, and the mass fraction of the cross-linking agent in the water phase is 0.1%-1.5%. The cross-linked polymer microsphere has the advantages that the cross-linked polymer microsphere is good in shear resistance and other stability, the defects that an existing polymer microsphere is high in water absorption expansion rate, large in water absorption expansion multiple and poor in shear resistance are overcome, and the cross-linked polymer microsphere has wide application prospects in the field of deep profile control of oil reservoirs.

Description

technical field [0001] The invention belongs to the field of oil and gas field development and enhanced recovery, and specifically relates to a cross-linked polymer microsphere and a preparation method and application thereof. Background technique [0002] Due to the horizontal and vertical heterogeneity of the reservoir, the difference in oil-water viscosity and the imperfection of the injection-production well pattern, during the water injection development process of the oilfield, serious dominant seepage channels will be formed between the injection-production wells, resulting in a decrease in the utilization rate of injected water , The overall water cut increases, which reduces the degree of oil recovery and development benefits. Therefore, it is necessary to study the technology of profile control and control and flooding in high water-cut oilfields, expand the swept volume of injected water, and improve oil recovery and development benefits. [0003] At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/18C08K5/13C08K5/07C09K8/512
CPCC08F220/56C08K5/07C08K5/13C09K8/512C09K8/887C08F220/585C08F220/1818
Inventor 曹子娟钟立国王成刘建斌刘义刚李彦阅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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