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Nanoparticle-crosslinked polymer oil-displacing agent and preparation method and application thereof

A technology of nano-particles and polymers, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of being susceptible to mechanical shear, reducing the amount of polyacrylamide used, and using a large amount of cross-linking agent, etc., to achieve The effect of enhancing oil recovery and improving efficiency

Active Publication Date: 2019-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent document CN93115276.3 discloses a kind of polyacrylamide (or xanthan gum) as a gelling agent, with chromium lactate as a crosslinking agent prepared crosslinked polymer oil displacing agent, which utilizes crosslinking agent chromium lactate to polymerize The compound becomes a cross-linked polymer, so as to solve the problem of poor salt resistance and mechanical shearing of the polymer. In this patent document, the concentration of the polyacrylamide aqueous solution is preferably 800-8000 mg / L, and the amount of the cross-linking agent chromium lactate The best is 300-3000mg / L. The disadvantage of this technical solution is: because the use of small molecule cross-linking agent will lead to intramolecular cross-linking reaction of a large number of polymers, the amount of cross-linking agent used is relatively large
Patent document CN97104045.1 discloses the use of cross-linking agent aluminum citrate to replace part of polyacrylamide in polymer flooding technology, and to reduce the amount of polyacrylamide used while ensuring that the injection viscosity does not decrease and is appropriately increased, thereby Reduce the injection cost, but the injection viscosity does not increase much, only 0-25%

Method used

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preparation example Construction

[0019] In the present invention, the ZrO 2 Nanoparticles are acid-activated ZrO 2 Nanoparticles. Acid-activated ZrO 2 Nanoparticles are ZrO 2 Nanoparticles are activated under low acidity conditions, and the preparation method includes: adding ZrO 2 The nanoparticles are ultrasonically dispersed and activated in an acid solution with a pH of 3 to 4 for 1 to 10 minutes, and the activation temperature is 10 to 50°C.

[0020] According to the present invention, the acid used in the acid solution for activation may be selected from at least one of hydrochloric acid, acetic acid, sulfuric acid and oxalic acid.

[0021] In the present invention, the ZrO 2 The particle size of the nanoparticles may be 1-200 nm, preferably 10-100 nm.

[0022] According to the present invention, the polyacrylamide is partially hydrolyzed polyacrylamide, and its molecular weight ranges from 5 to 20×10 6 , The degree of hydrolysis is 10-30%.

[0023] The second aspect of the present invention pro...

Embodiment 1

[0040] Firstly, polyacrylamide was formulated into a 1000mg / L solution, and then ZrO with a particle size of 20nm 2 The particles were ultrasonically dispersed in an oxalic acid solution with pH=3 and activated for 5 minutes at an activation temperature of 30°C. After centrifugation and deionized water washing, the particles were dispersed in deionized water as a crosslinking agent solution for later use. The particle concentration was 10mg / L. Take 200mL polymer solution to make glue, add 1mL cross-linking agent solution, stir at 60°C for 10 minutes, then measure the viscosity of the cross-linked polymer solution to be 23mPa·s, and measure the viscosity after 3 days of aging to be 38mPa·s. The results of core displacement experiments show that the cross-linking system can increase oil recovery by 8.3%.

Embodiment 2

[0042] Firstly, polyacrylamide was formulated into a 3000mg / L solution, and then ZrO with a particle size of 50nm 2 The particles were ultrasonically dispersed in a sulfuric acid solution with pH=3 and activated for 5 minutes at a temperature of 10°C. After being centrifuged and washed with deionized water, the particles were dispersed in deionized water as a cross-linking agent solution for later use. The particle concentration was 100mg / L. Take 100mL polymer solution to make glue, add 1mL cross-linking agent solution, stir at 60°C for 10 minutes, measure the viscosity of the cross-linked polymer solution to be 85mPa·s, and measure the viscosity after 3 days of aging to be 184mPa·s. The results of core displacement experiments show that the cross-linking system can increase oil recovery by 23%.

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Abstract

The invention belongs to the technical field of oilfield development and particularly provides a nanoparticle-crosslinked polymer oil-displacing agent and a preparation method and application thereof.The nanoparticle-crosslinked polymer oil-displacing agent comprises polyacrylamide, ZrO2 nanoparticles and water, wherein the concentration of the polyacrylamide is 90-3000 mg / L, and the concentration of the ZrO2 nanoparticles is 0.001-1 mg / L. The nanoparticle-crosslinked polymer oil-displacing agent using activated nano ZrO2 as a crosslinker helps control a polymer to generate intermolecular crosslinking reaction, so that crosslinking reaction efficiency is improved, the usage of the crosslinker is reduced, viscosity of the polymer solution is improved, and oil recovery is enhanced.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and in particular relates to a nanoparticle crosslinked polymer oil displacement agent, a preparation method thereof, and an application of the nanoparticle crosslinked polymer oil displacement agent. Background technique [0002] At present, most oilfields in our country are in the middle and late stage of development, and the water content rises rapidly, even as high as 90%. The existing water injection technology has been difficult to meet the needs of oilfields. EOR is mainly achieved from two aspects: one is to increase the sweep coefficient of the injected fluid in the oil layer, and the main method is to improve the heterogeneity of the reservoir or reduce the mobility of the displacement phase to stabilize the displacement. Frontal replacement is generally achieved by profile control or by increasing the viscosity of the displacement fluid; another aspect is to improve the oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/88C08J3/24C08L33/26
CPCC08J3/24C08J2333/26C09K8/588C09K8/887
Inventor 卢刚吕成远马涛许关利刘平谭中良贾红育周国华聂俊
Owner CHINA PETROLEUM & CHEM CORP
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