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

A technology for adjusting flooding agent and foam, which is applied in chemical instruments and methods, production fluids, and earthwork drilling, etc. It can solve the problem that the recovery rate of the interfacial tension between crude oil and water is not high enough, the polymer flooding cannot be greatly reduced, and the impact of problems such as normal production of oil wells, to achieve the effects of improving crude oil recovery, reducing oil production costs, and increasing sweeping coefficients

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 still have deficiencies, because polymer flooding cannot greatly reduce the interfacial tension between crude oil and water, and 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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  • Oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method
  • Oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method
  • 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

[0038] Embodiment one, the preparation of foam regulating and displacing agent

[0039]1. Displacing agent 1: polymer 1-alkylbenzene sulfonate sodium 0.1wt% foam displacing agent. Take 500 mg of polymer 1 (purchased from Shanghai Haibo Co., Ltd. functional polymer type I, viscosity greater than 100 mPa.s), 1 mg of sodium alkylbenzene sulfonate, mix and add 1 L of water to dissolve, and obtain 1 L of foam control agent solution, which is A polymer 1-alkylbenzenesulfonate sodium foam control agent solution with a blowing agent concentration of 0.1 wt%.

[0040] 2. Flooding agent 2: polymer 2-alkyl sulfonate sodium 0.2wt% foam regulating agent. Take 500mg of polymer 2 (purchased from Shanghai Haibo Co., Ltd. functional polymer type II, with a viscosity greater than 50mPa.s), 2mg of sodium alkylsulfonate, mix them and add 1L of water to dissolve them to obtain 1L of foam control agent solution. Foaming agent adding amount (concentration) is 0.2wt% polymer 2-alkylbenzenesulfonate...

Embodiment 2

[0044] Example 2. Oil displacement experiment of heterogeneous core polymer-foam displacement system

[0045] Indoor physical simulation experiments are adopted.

[0046] Experimental conditions:

[0047] Heterogeneous core: 4.5×4.5×30cm, gas permeability of three layers are 100md, 1000md, 3000md respectively.

[0048] Oil: simulated crude oil, the viscosity is 10mPa·s at 45°C;

[0049] Water: Oilfield sewage;

[0050] Adjusting and displacing agent: according to embodiment 1 preparation;

[0051] Experimental temperature: 45°C;

[0052] Foam: The volume ratio of foam control agent and compressed air is 1:1;

[0053] Polymer: the functional polymer in Example 1.

[0054] experimental method:

[0055] Water drives the core to a moisture content of over 98%. After the 2PV of water flooding in the early stage, the combination slug is injected, followed by: 0.07PV polymer (viscosity 1500mPa.s), 0.01PV polymer (viscosity 560mPa.s), 0.15PV polymer (51mPa.s), and then injecte...

Embodiment 3

[0058] Example three: the same experimental conditions and methods as in Example two, the combined slugs are as follows: water flooding 1.41PV, injection of 0.07PV, 1500mg / L type I functional polymer (viscosity 1500mPa.s); 0.01PV, 1500mg / LIII type functional polymer (viscosity 560mPa.s); 0.15PV, 1000mg / LIII type functional polymer (51mPa.s); Note 0.1PV, 1500mg / L type II functional polymer (viscosity 1400mPa.s); 0.01 PV, 1500mg / L III functional polymer (viscosity 560mPa.s); 0.10PV, 1000mg / L III functional polymer (51mPa.s); 0.3PV foam (0.3% blowing agent + 500mg / L III functional polymer material); the follow-up water flooding was 1.20PV, and the injected foam control and flooding agent solution was 0.3PV polymer 1-alkylbenzene sulfonate sodium 0.1wt% foam control and flooding agent.

[0059] The oil displacement results show that the use of functional polymer foam flooding can increase the recovery rate by more than 38% on the basis of water flooding, and the total recovery ra...

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PUM

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Abstract

The invention discloses a foam profile control and displacement agent used for petroleum exploitation. The foam profile control and displacement agent is prepared from functional polymer solution and foaming agent by mixing, wherein the foaming agent has a concentration of 0.05 to 1wt 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 a foam slug consisting of the foam profile control and displacement agent and compressed gas, 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 71 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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IPC IPC(8): C09K8/588C09K8/94E21B43/22
CPCC09K8/588
Inventor 李兆敏康万利韩修廷冯其红蒲春生李宾飞刘忠和赵金省孟令伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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