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Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method

A technology of elastic particles and flooding agents, applied in chemical instruments and methods, mining fluids, earth drilling and production, etc., can solve problems such as ineffective water circulation, foam flooding, gas channeling, scaling, etc., to achieve enhanced oil recovery, increase Sweep factor and the effect of improving oil washing efficiency

Active Publication Date: 2008-12-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Several methods have disadvantages. Polymer flooding cannot greatly reduce the interfacial tension between crude oil and water, so the range of enhanced oil recovery is not high enough.
Although the ASP flooding can greatly reduce the interfacial tension, the addition of alkali greatly weakens the viscoelasticity of the polymer, especially the polymer elasticity. In addition, the alkali causes scaling and crude oil emulsification, which affects the normal production of oil wells. Prone to gas channeling, etc.
Moreover, there are a large number of invalid water circulation phenomena in several methods

Method used

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  • Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method
  • Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method
  • Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, the preparation of elastic particle regulating and displacing agent

[0035] Material:

[0036] Polymer 1: Shanghai Haibo Company, functional polymer type I, viscosity greater than 100mPa.s;

[0037] Polymer 2: Shanghai Haibo Company, functional polymer type III, viscosity greater than 50mPa.s;

[0038] Elastic particles 1: Kaifeng Aode Technology Co., Ltd., AD22-104 bulky particles, 100-200 mesh;

[0039] Elastic particles 2: Linhai Yongfeng Jianghua waste tire crushing plant, rubber particles, 0-80 mesh;

[0040] Elastic granules 3: flexible granules, from Petroleum Exploration and Development Research Institute, tensile strength 28.44kPa, adjustable particle size.

[0041] Preparation:

[0042] Regulator 1: Take 1500mg of polymer 1 and add 1L of water to make a solution, then add 150 mesh (particle diameter) of 0.5g elastic particles 1, and after mixing, obtain polymer 1-body swelling with a mass concentration of elastic particles of 0.05wt%. Dispers...

Embodiment 2

[0047] Example 2. Oil displacement experiment of heterogeneous core polymer-elastic particle flooding system

[0048] Indoor physical simulation experiments are adopted.

[0049] Experimental conditions:

[0050] Heterogeneous core: 4.5×4.5×30cm, gas permeability of three layers are 100md, 1000md, 3000md respectively.

[0051] Oil: simulated crude oil, the viscosity is 10mPa·s at 45°C;

[0052] Water: Oilfield sewage;

[0053] Adjusting and displacing agent: according to embodiment 1 preparation;

[0054] Experimental temperature: 45°C;

[0055] Polymer: the functional polymer in Example 1.

[0056] experimental method:

[0057] After the initial water flooding of 2PV, inject 0.07PV, 1500mg / L type I functional polymer (viscosity 1500mPa. .s) (two rounds of injection) + 0.3PV foam (0.3% blowing agent - sodium alkylbenzene sulfonate + 500mg / L type III functional polymer), followed by water flooding 2PV.

[0058] Oil displacement results: see figure 1 . It shows that th...

Embodiment 3

[0060] Example 3. Oil displacement experiment of polymer-elastic particles-foam flooding system

[0061] Indoor physical simulation experiments are adopted.

[0062] Experimental conditions:

[0063] Heterogeneous core: 4.5×4.5×30cm, gas permeability of three layers are 100md, 1000md, 3000md respectively.

[0064] Oil: simulated crude oil, the viscosity is 10mPa·s at 45°C;

[0065] water: sewage;

[0066] Chemical agent: functional polymer and elastic particles in embodiment one, foaming agent sodium alkylbenzene sulfonate;

[0067] Experimental temperature: 45°C;

[0068] Foam: The volume ratio of foaming liquid to compressed air is 0.4:1;

[0069] experimental method:

[0070] The water content of water flooding is above 98%. After the initial water flooding of 2PV, inject a group of combined slugs, followed by: 0.08PV polymer 1 plus bulky particles (polymer viscosity 2400mPa.s, bulky particle size 150 mesh, concentration 0.5wt%), 0.1PV polymer 1 plus volume expansion...

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Abstract

The invention discloses an elastic granule profile control and displacement agent used for petroleum exploitation, which is a dispersion system prepared from 1,500mg / L functional polymer solution and elastic granules by mixing in water, wherein the elastic granules have a concentration of 0.05 to 3wt percent. The invention further discloses an oil displacement system formed by using the foam profile control and displacement agent and an oil displacement method. The oil displacement is achieved by using a combined slug consisting of functional polymers from high viscosity to low viscosity and the elastic grains, and is suitable for multiple kinds of anisotropic oil layers to effectively improve oil recovery, reduce ineffective water circulation, and improve economic benefits. Through the effective combination, the system can improve the recovery greatly, improve the total recovery to 90 percent or above and reduce the oil recovery cost greatly, and can be widely used for tertiary oil recovery.

Description

Technical field: [0001] The invention relates to the technical field of oil recovery, in particular to a chemical flooding system for enhancing crude oil recovery in tertiary oil recovery and a corresponding oil flooding method. Background technique: [0002] The extraction of underground crude oil is mainly primary oil recovery, crude oil is driven from the underground oil reservoir to the surface and extracted. Due to the consumption of natural energy, more crude oil in the oil reservoir after the primary oil recovery is extracted through secondary oil recovery, through water injection Provides the pressure required to drive crude oil from the ground to the surface. Affected by the depositional environment and conditions of the reservoir, the horizontal and vertical permeability distribution of oil layers is not uniform. For example, the variation coefficient of vertical permeability in Daqing Oilfield is mostly about 0.65. In the process of water injection development, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/92E21B43/22
Inventor 康万利李兆敏韩修廷冯其红孟令伟李宾飞赵金省王志伟周阳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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