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Submicron polymer active microsphere profile-control oil-displacement agent

A technology of profile control oil displacement agent and polymer, which is applied in the direction of drilling equipment, etc., can solve the problems of temperature salinity influence, limited profile control depth, weak strength, etc., achieve strong salinity resistance, meet energy demand, The effect of high ripple efficiency

Inactive Publication Date: 2005-03-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0005] Practice has proved that the existing technology has the following limitations: ①Inorganic particle profile control agent is only suitable for profile control in large channels with shortfall near the bottom of the well. construction; ②Polymer gel is suitable for profile control near the borehole wall, and the depth of profile control is limited. Formation and strength are affected by formation temperature and salinity, and profile control pumps are required for profile control; ③ Weak gel control and flooding is a kind of inter- or intra-molecular crosslinking, which can increase the viscosity of polymer solution, but it is still fluid, and the strength Weak, it is seriously affected by the temperature salinity, and the concentration of the system changes due to the adsorption of the rock to the cross-linking agent, and it is not easy to cross-link

Method used

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Embodiment Construction

[0013] The present invention will be specifically described below in conjunction with examples.

[0014] The submicron polymer active microsphere profile control and oil displacement agent provided by the present invention is an active polyacrylamide gel, and its molecular structure formula is:

[0015]

[0016] Can be synthesized by:

[0017] Take 8%~20% of acrylamide, 0.01~0.1% of methylene bisacrylamide, 0.1~0.2% of ammonium persulfate, and 1~3% of sodium dodecylbenzenesulfonate to make a solution, and heat it at 60~100℃ The solution is atomized into 0.2-20 μm micro-droplets by high-pressure spray or two-phase flow ultrasonic atomization method, and dispersed in the oil phase medium for polymerization reaction for about 1 hour to obtain submicron polymer active microspheres for oil displacement.

[0018] Microsphere particle size design principle: the permeability is 1 μm 2 The average pore diameter of the oil layer is 10.4 μm, and the permeability is 2 μm 2 The avera...

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Abstract

The invention discloses a submicron polymer active microsphere profile-control oil-displacement agent which is an active polyacrylamide gel with a molecular weight of 1-8 million, and the agent is prepared through a dispersion-polymerization synthesizing method, wherein a novel transportable oil displacement agent is obtained.

Description

Technical field: [0001] The invention relates to a submicron polymer active microsphere profile control and oil displacement agent. Background technique: [0002] Oilfield recovery is determined by the swept volume of injected fluid and oil washing efficiency. The complexity and serious heterogeneity of reservoir rocks and the large flow channel formed by long-term water injection lead to small swept volume of injected water and low oilfield recovery. Low. When the oil field enters the period of high water cut and ultra-high water cut, a large amount of injected water circulates reactively, but the low permeability layer in the reservoir and the low permeability area of ​​the same layer have not been swept, and there is still a large amount of remaining oil. Therefore, changing the injected water Seepage direction, increasing the swept volume of injected water is an important method to enhance oil recovery. [0003] Over the years, researchers at home and abroad have done ...

Claims

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Application Information

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Inventor 雷光伦
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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