Method for preventing bottom water onrushing of oilfield

A bottom water and oil field technology, applied in the field of applied chemistry, can solve the problems of short validity period, poor effect, high oil-water two-phase permeability, etc., 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

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Problems solved by technology

However, decades of practical results have proved that this method is ineffective and has a short validity period. The reason is that the injected material is unlikely to be injected against the relatively high-energy direction of the bottom water gushing out. At the same time, even if the bottom water breakthrough point is blocked, due to the If the pressure difference between the bottom water layer and the oil-water two-phase permeability is too large, other intrusion points will still be formed

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  • Method for preventing bottom water onrushing of oilfield
  • Method for preventing bottom water onrushing of oilfield
  • Method for preventing bottom water onrushing of oilfield

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preparation example Construction

[0030] 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.

[0031] 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.

[0032] Optionally, wherein the polymeriz...

Embodiment 1

[0039] 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 25-70 ℃, pH=7.0-7.8, and total salinity 1000-36000mg / L, the total amount of calcium and magnesium ions is 15-1500mg / L, the average permeability is 1800mD, and the viscosity of crude oil in the oil reservoir is 1-50cP. Significant bottom water outburst occurred in this reservoir.

[0040] 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 ...

Embodiment 2

[0044] The oil reservoir is located in an ordinary water injection development oilfield, its geological conditions are lacustrine, fluvial or delta sedimentary sandstone, the reservoir is flat, the mineral deposit conditions are temperature 25-70 ℃, pH=7.8-8.2, and the total salinity is 1000-36000mg / L, the total amount of calcium and magnesium ions is 15-1500mg / L, the average permeability is 1800mD, and the viscosity of crude oil in the oil reservoir is 1-50cP. Significant bottom water outburst occurred in this reservoir.

[0045] 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, polyoxyet...

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Abstract

The invention provides a method for preventing bottom water onrushing of an oilfield. The method comprises the steps that an injection and production well, nearest to the bottom water onrushing point,in multiple injection and production wells of oil reservoirs subjected to bottom water onrushing serves as a water injection well, and reinjection water is injected into the water injection well so as to displace crude oil in the oil reservoir; one or more injection and production wells, except for the water injection well, in the injection and production wells serve as oil production wells, thuscrude oil is produced; and the reinjection water contains swollen nanoparticles with the particle size being 10 nm-300 nm, and the nanoparticles are kept to be dispersed stably and not layered in thereinjection water. Through the method for preventing bottom water onrushing of the oilfield, bottom water onrushing of the oilfield can be effectively prevented.

Description

technical field [0001] The present disclosure relates to the field of applied chemistry, and in particular, to a method for preventing oilfield bottom water intrusion. Background technique [0002] In the process of oil field development, it is often encountered that the bottom water breaks in, causing the oil well to have too high water cut, or even violent water flooding, the production efficiency drops sharply, and the oil recovery rate cannot be improved. This is because the energy of the oil layer decreases sharply due to the extraction of the upper layer of crude oil, and the original metastable state of the oil-water layer is broken, and the permeability of water in porous media is much higher than that of crude oil, resulting in the bottom water in the porous medium. Driven by the energy inside the water layer, it rushes upwards. [0003] In order to solve this problem, the method used in the past is to block water, using materials such as polymer gel or ultra-fine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/22C09K8/584C09K8/588
CPCC09K8/584C09K8/588E21B43/16E21B43/20
Inventor 吴飞鹏
Owner 北京盘开精化科技有限公司
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