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Method for increasing crude oil output and recovery rate

A recovery factor and crude oil technology, applied in the field of applied chemistry, can solve problems such as difficulty in crude oil production and recovery efficiency, and achieve the effect of reducing permeability and simple equipment

Active Publication Date: 2018-11-16
北京盘开精化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the insurmountable contradiction between injectivity and plugging, and enrichment in the near-wellbore area, field application results prove that it is difficult to increase crude oil production and recovery efficiency

Method used

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  • Method for increasing crude oil output and recovery rate
  • Method for increasing crude oil output and recovery rate
  • Method for increasing crude oil output and recovery rate

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preparation example Construction

[0023] Optionally, wherein, the preparation method of the nanoparticles includes: adding the aqueous solution of the polymerized monomer to the oil phase medium to obtain a polymerization reaction system and performing visible light photosensitized polymerization to obtain a polymerized product, and then dispersing the polymerized product in the Reinjection into water: the polymerized monomer includes acrylamide and modified monomer, and the oil phase medium includes solvent oil, surfactant and visible light initiator.

[0024] Among them, visible light photosensitized polymerization is relatively easy to control the reaction speed, which is the reason why the nanoparticles can have a suitable particle size of 10 nm to 300 nm. Wherein, the surface of the nanoparticles in the reinjection water is charged and has a smaller particle size after swelling, so it can maintain stable dispersion in the reinjection water without stratification.

[0025] Optionally, wherein the polymeriz...

Embodiment 1

[0032] The oil reservoir is located in an ordinary waterflooding oilfield, its geological conditions are lacustrine, fluvial or delta sedimentary sandstone, the reservoir is flat, the mineral deposit conditions are temperature 25-80 ℃, pH=6.8-7.6, and the total salinity is 1000-34000mg / L, the total amount of calcium and magnesium ions is 15-1500mg / L, the average permeability is 2000mD, and the viscosity of crude oil in the oil reservoir is 1-50cP.

[0033] According to the reservoir conditions, the most preferred synthetic formula of nanoparticles in the reinjected water is: water phase composition, water 28g, acrylamide 20g, acrylic acid 0.5g, p-vinylbenzenesulfonic acid 1g, AMPSNa5g, N,N '-Methylenebisacrylamide 200mg, pentaerythritol acrylate 5mg, neutralized with 5% NaOH aqueous solution to pH=7.0; oil phase composition: No. 7 white oil 16g, aliphatic sorbitan ester 8g, polyoxyethylene Sorbitan fatty ester 1g, fatty alcohol polyoxyethylene ether 1.5g, methylene blue 200mg...

Embodiment 2

[0037] The oil reservoir is located in an ordinary water flooding development oilfield, its geological conditions are lacustrine, fluvial or delta sedimentary sandstone, the reservoir is flat, the mineral deposit conditions are temperature 25-80 ℃, pH=7.8-8.4, and total salinity 1000-34000mg / L, the total amount of calcium and magnesium ions is 15-1500mg / L, the average permeability is 2000mD, and the viscosity of crude oil in the oil reservoir is 1-50cP.

[0038] According to this reservoir condition, the most preferred synthetic formula of nanoparticles in the reinjected water is: water phase composition, water 28g, acrylamide 16g, acrylic acid 0.5g, p-vinylbenzenesulfonic acid 2g, AMPSNa7g, N,N 200 mg of '-methylenebisacrylamide, 5 mg of pentaerythritol acrylate, neutralized with 5% NaOH aqueous solution to pH = 7.0; oil phase composition: 16 g of No. 7 white oil, 8 g of aliphatic sorbitan ester, polyoxyethylene Sorbitan fatty ester 1g, fatty alcohol polyoxyethylene ether 1....

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Abstract

The invention provides a method for increasing the crude oil output and recovery rate. The method comprises the steps that one or more of a plurality of injection and production wells of an oil reservoir serve as water injection wells, reinjection water is injected into the water injection wells so as to displace crude oil in the oil reservoir, one or more of the injection and production wells except for the water injection wells serve as oil production wells so as to produce the crude oil, and nano-particles are contained in the reinjection water, wherein the particle size of the swelled nano-particles is 10-300 nm, and the nano-particles are kept to be stably dispersed and not layered in the reinjection water. Through the method for increasing the crude oil output and recovery rate, thecrude oil output can be increased by at least about 50-300%.

Description

technical field [0001] The present disclosure relates to the field of applied chemistry, and in particular, to a method of enhancing crude oil production and oil recovery. Background technique [0002] At present, the most mature and effective way to increase crude oil production and recovery in water flooding development oilfields is polymer injection technology, which is to dissolve partially hydrolyzed polyacrylamide or similar polymer solutions in water, and utilize the viscosity and shear rheology of linear polymer solutions , expand the swept volume factor of the water phase in the reservoir, reduce the water content of the oil well, and increase the crude oil production and recovery. However, because this technology utilizes the difference in the interaction force between linear polymer molecules in the bulk phase and shear rheology in the solution state of partially hydrolyzed polyacrylamide polymer molecules, it is limited by the temperature of the reservoir. , sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/588C09K8/584
CPCC09K8/584C09K8/588E21B43/16
Inventor 吴飞鹏
Owner 北京盘开精化科技有限公司
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