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Microsphere oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method

A technology of regulating and displacing agents and microspheres, which is applied in the fields of chemical instruments and methods, mining fluids, earth drilling, etc., can solve the problems of foam flooding, gas channeling, ineffective water circulation, and weakening polymer viscoelasticity, so as to reduce ineffective water circulation, Enhanced oil recovery and reduced oil production costs

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment one, the preparation of microsphere regulating and displacing agent

[0035] Material:

[0036] Polymer 1: functional polymer type I purchased from Shanghai Haibo Co., Ltd., with a viscosity greater than 100 mPa.s.

[0037] Polymer 2: purchased from Shanghai Haibo Co., Ltd. functional polymer type III, with a viscosity greater than 50 mPa.s.

[0038] Microspheres: developed by China University of Petroleum (see pages 749-751 of Xinjiang Petroleum Geology, Volume 28, Issue 6, 2007), the size of the microspheres is d=0.2-20 μm, and the diameter of the microspheres is preferably in the range of d=0.2-10 μm.

[0039] Preparation:

[0040] Displacing agent 1: Take 0.15 g of polymer 1 and add 1 L of water to form a solution, then add 0.5 g of microspheres, and mix to obtain a dispersion system of polymer 1-microsphere displacing agent with a microsphere concentration of 0.05 wt%.

[0041] In the same way, you can formulate:

[0042] Displacing agent 2: polymer ...

Embodiment 2

[0046] Example 2. Oil displacement experiment of heterogeneous core polymer-microsphere flooding system

[0047] Indoor physical simulation experiments are adopted.

[0048] Experimental conditions:

[0049] Heterogeneous core: 4.5×4.5×30cm, gas permeability of three layers are 100md, 1000md, 3000md respectively.

[0050] Oil: simulated crude oil, the viscosity is 10mPa·s at 45°C;

[0051] Water: Oilfield sewage;

[0052] Adjusting and displacing agent: according to embodiment 1 preparation;

[0053] Experimental temperature: 45°C;

[0054] Polymer: the functional polymer in Example 1.

[0055] experimental method:

[0056] After the initial water flooding of 2PV, inject 0.07PV, 1500mg / L type I functional polymer (viscosity 1500mPa.s) + 0.01PV, 1500mg / LIII type functional polymer plus 1000mg / L microspheres (microsphere size d=0.2- 20μm, viscosity 560mPa.s) + 0.15PV, 1000ppm Type III functional polymer (51mPa.s) (injection into two rounds) + 0.3PV foam (0.3% blowing agen...

Embodiment 3

[0060] Example 3. Oil displacement experiment of polymer-microsphere-foaming oil displacement 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 microspheres in Example 1, foaming agent is alkanolamide surfactant or petroleum sulfonate surfactant;

[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: 0.1PV flooding agent 1 (polymer 1 viscosity 1500mPa.s, microsphere 1 size d=0.2-20μm, Microsphere concentration 500mg / L), 0.1PV poly...

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Abstract

The invention discloses a microsphere profile control and displacement agent used for petroleum exploitation, which is a dispersion system prepared from functional polymer solution and microspheres with diameter of 0.2 to 20 mum by mixing, wherein the microspheres have a concentration of 0.05 to 0.2wt percent. The invention further discloses a combined oil displacement system formed by using the foam profile control and displacement agent and a combined 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 microspheres, 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 70 to 89 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): C09K8/588E21B43/22
Inventor 康万利李兆敏韩修廷冯其红孟令伟雷光伦李宾飞赵金省王志伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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