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Temperature-resistance salt-resistance foam profile controlling and displacement system suitable for complex oil reservoirs and preparation method and application of system

An oil-displacing method and system technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of inapplicability to high temperature, high-salt reservoirs, poor temperature and salt resistance, complicated preparation methods, etc. Improved profile control efficiency, reduced solubility, and excellent temperature resistance

Active Publication Date: 2019-08-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oil displacement system requires many components, and the preparation method is relatively complicated.
[0005] The Chinese invention patent application with the application number 201610936584.2 discloses a surfactant micellar oil displacement agent, which uses sodium dodecyl sulfate (SDS) and silicon dioxide to compound to obtain a foam system, but its temperature resistance is relatively low. Poor, and, due to the addition of certain counter ions, the applicable salinity range is relatively low
Due to the harsh conditions of complex reservoirs (temperature 130°C, total salinity 220,000 mg / L), simple surfactant foam systems are prone to defoaming under high-temperature and high-salt conditions. However, the current oil displacement foam Most of the systems are poor in temperature and salt resistance, and cannot be applied to high temperature and high salt reservoirs

Method used

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  • Temperature-resistance salt-resistance foam profile controlling and displacement system suitable for complex oil reservoirs and preparation method and application of system
  • Temperature-resistance salt-resistance foam profile controlling and displacement system suitable for complex oil reservoirs and preparation method and application of system
  • Temperature-resistance salt-resistance foam profile controlling and displacement system suitable for complex oil reservoirs and preparation method and application of system

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preparation example Construction

[0050] In a second aspect, the present invention provides a method for preparing the above-mentioned control and flooding system, which specifically includes the following steps:

[0051] (1) cetyltrimethylammonium bromide is added to dissolve in water to obtain cetyltrimethylammonium bromide solution;

[0052] (2) adding nano-titanium dioxide to cetyltrimethylammonium bromide solution to obtain a uniformly dispersed mixed solution of nano-titanium dioxide;

[0053] (3) Add partially hydrolyzed polyacrylamide into the mixed solution and stir evenly to obtain a control and flooding system.

[0054] In a specific embodiment, the preparation method of the control and flooding system comprises the following steps:

[0055] (1) At 25°C, first add the surfactant CTAB into the water, stir with a magnetic stirrer to fully dissolve the surfactant CTAB, and obtain a CTAB aqueous solution;

[0056] (2) Add nano-TiO dropwise in CTAB aqueous solution 2 , sonicated after stirring to make...

Embodiment 1

[0083] The composition (percentage by weight) of the control and drive system of the present embodiment is: the particle diameter is the hydrophilic type TiO of 30nm 2 2% of particles, 0.9% of CTAB, 0.1% of HPAM with a molecular weight of 7 million and a degree of hydrolysis of 10%, and the balance is simulated mineralized water with a total salinity of 220,000 mg / L (where Ca 2+ with Mg 2+ The ion concentration is 2000mg / L).

[0084] The preparation method of the regulating and flooding system of the present embodiment is:

[0085] (1) At 25°C, add the surfactant CTAB into the simulated mineralized water with a total salinity of 220,000 mg / L, stir with a magnetic stirrer for 3 to 5 minutes to fully dissolve the surfactant CTAB, and obtain a CTAB aqueous solution;

[0086] (2) Add hydrophilic TiO with a particle size of 30nm dropwise in the CTAB aqueous solution 2 Particles, stirred for 3 to 5 minutes and then ultrasonicated for 30 minutes to make nano-TiO 2 Uniformly dispe...

Embodiment 2

[0095] The composition (percentage by weight) of the control and drive system of the present embodiment is: the particle diameter is the hydrophilic type TiO of 30nm 2 1% of particles, 0.5% of CTAB, 0.2% of HPAM with a molecular weight of 7 million and a degree of hydrolysis of 10%, and the balance is simulated mineralized water with a total salinity of 220,000mg / L (where Ca 2+ with Mg 2+ The ion concentration is 2000mg / L).

[0096] The preparation method of the regulating and flooding system of the present embodiment is:

[0097] (1) At 25°C, add the surfactant CTAB into the simulated mineralized water with a total salinity of 220,000 mg / L, stir with a magnetic stirrer for 3 to 5 minutes to fully dissolve the surfactant CTAB, and obtain a CTAB aqueous solution;

[0098] (2) Add hydrophilic TiO with a particle size of 30nm dropwise in the CTAB aqueous solution 2 Particles, stirred for 3 to 5 minutes and then ultrasonicated for 30 minutes to make nano-TiO 2 Uniformly disper...

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Abstract

The invention provides a profile controlling and displacement system. The system is prepared from, by weight, 1%-3% of nanometer titanium dioxide, 0.2%-0.9% of cetyl trimethyl ammonium bromide, 0.01%-0.3% of partially-hydrolyzed polyacrylamide and the balance water. The invention further provides a preparation method and application of the profile controlling and displacement system and a displacement method which adopts the profile controlling and displacement system and is used for oil reservoirs for reservoir oil. The profile controlling and displacement system is suitable for complex oil reservoirs with harsh conditions, has the advantages of temperature resistance and salt resistance and can achieve the excellent effect of displacement of the reservoir oils.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation. Specifically, the invention provides a temperature-resistant and salt-resistant foam control and flooding system suitable for complex oil reservoirs, a preparation method and application thereof. Background technique [0002] After primary oil recovery and secondary oil recovery in major domestic oil fields, the water content of crude oil has risen steadily, and most oil fields have entered the stage of tertiary oil recovery. Tertiary oil recovery mainly changes the water-oil mobility ratio by adding chemical substances, thereby enhancing oil recovery. At present, alkali flooding, polymer flooding, surfactant flooding, and binary or triple compound flooding are more commonly used. Foam systems have the advantages of high apparent viscosity, defoaming when in contact with oil, and stability in contact with water. Foam control and flooding technology has emerged as the times require ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/504C09K8/584C09K8/88
CPCC09K8/5045C09K8/5083C09K8/584C09K8/882C09K2208/10
Inventor 赵海洋王世洁刘中云刘宝增李亮李海霞丁保东任波何龙冯一波焦保雷秦飞魏芳杨利萍甄恩龙
Owner CHINA PETROLEUM & CHEM CORP
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