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Organic granular plugging agent for CO2-driving high-temperature low-permeation water-sensitive oil deposit and preparation method thereof

A technology of organic particles and plugging agents, which is applied in the direction of chemical instruments and methods, bulk chemical production, drilling compositions, etc., can solve the problems of low permeability layer not being activated, large permeability difference, etc., and achieve the response time Controllable, strong erosion resistance, high strength effect

Inactive Publication Date: 2015-04-01
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for multi-layer reservoirs with strong reservoir heterogeneity, the permeability difference between layers is large, and CO injection 2 In the process of gas flooding, the high-permeability layer is often the main layer for gas breakthrough, while the low-permeability layer is not activated

Method used

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  • Organic granular plugging agent for CO2-driving high-temperature low-permeation water-sensitive oil deposit and preparation method thereof
  • Organic granular plugging agent for CO2-driving high-temperature low-permeation water-sensitive oil deposit and preparation method thereof
  • Organic granular plugging agent for CO2-driving high-temperature low-permeation water-sensitive oil deposit and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 3g of hydroquinone, 3g of formaldehyde, 5.6g of furfural, 1.13g of catalyst, 70g of alcohol, and 17.27g of dispersant into a 250ml three-necked flask, and then heat it to 100°C; if not stirred, the resulting particles will have a large particle size ; If stirring, the generated particle size is smaller; the products generated with stirring and without stirring are respectively filtered and dried, and the yields are both 92.83%.

Embodiment 2

[0027] Add 4.5g of hydroquinone, 10g of formaldehyde, 11g of furfural, 2.3g of catalyst, 56.7g of alcohol, and 15.5g of dispersant into a high-temperature and high-pressure reactor, and pass in CO 2 Then pressurized to 10MPa, and then heated to 126°C; the particles generated were more than those in Example 1; the yield was 95.81%.

Embodiment 3

[0029] 8g of hydroquinone, 10g of formaldehyde, 10g of furfural, 2g of catalyst, 50g of alcohol, and 20g of dispersing agent were added to a 250ml three-neck flask respectively, and then heated to 126°C; the particles produced were more than those in Example 2; the yield was 96.32 %.

[0030] CO 2 Model experiment of sand flooding pipe plugging

[0031] Experimental steps: Grind the sand, dry it, fill it into a 30cm sand filling pipe, saturate it with water and oil, place the sand filling pipe for 24 hours for aging, water flooding to a comprehensive water content of 98%, and end the water flooding; 2PV carbon dioxide Flood (make a slug) until the displacement pressure is stable; inject 0.6PV plugging agent solution; place the sand filling pipe in an oven at 126°C for 48 hours, and then perform CO 2 Flood until the displacement pressure stabilizes. Record the injection pressure, the volume of produced oil and water at each stage and calculate the corresponding recovery degr...

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Abstract

The invention relates to an organic granular plugging agent for a CO2-driving high-temperature low-permeation water-sensitive oil deposit and a preparation method thereof, and belongs to the technical field of chemical agent application in petroleum drilling engineering. The organic granular plugging agent is characterized by comprising organic phenol, formaldehyde, furfural, para-toluenesulfonic acid, organic alcohol and a dispersing agent; an adopted isolation section plug is a gas: N2 or CO2; the plugging agent is subjected to carbonyl addition and condensation reaction mainly through the raw materials under the action of a catalyst to form a polymer which takes fural as a bridge and furan hydroxymethyl as an end group, and an organic gel granule is synthesized at an atmosphere of acidity or supercritical CO2 through a solution-sol-gel method; and polymer molecules are enlarged to a certain degree with polymerization reaction, and when the polymer molecules are enlarged to exceed solubility, the polymer molecules are condensed with each other to form an organic granule. The organic granular plugging agent provided by the invention is low in viscosity, easy to pump into a stratum, controllable in gelling time and high in strength and controllable in reaction time after being gelled under the condition of normal temperature, and has the characteristics of high temperature resistance, scouring resistance, stability in property and high plugging rate.

Description

Technical field: [0001] The present invention relates to a CO 2 The invention relates to an organic particle plugging agent for flooding high-temperature and low-permeability water-sensitive oil reservoirs and a preparation method thereof, belonging to the technical field of chemical agent application in petroleum drilling engineering. Background technique: [0002] The undeveloped oilfields found in China in recent years are mainly low-permeability and ultra-low-permeability reservoirs and other difficult-to-develop reserves, and the difficulty of exploitation is becoming more and more difficult, mainly due to the low permeability and easy water sensitivity of low-permeability reservoirs. . Note CO 2 Gas enhanced oil recovery has low cost, remarkable effect, and good miscibility with crude oil, so it has become an enhanced oil recovery technology with good development prospects. Compared with the traditional water injection development method, the favorable factors of th...

Claims

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Application Information

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IPC IPC(8): C09K8/594C09K8/508C08G8/04C08G8/06C08G8/20
CPCY02P20/54
Inventor 李凡罗跃汪庐山丁康乐颜学敏杨欢刘巍罗宵肖清燕刘磊
Owner YANGTZE UNIVERSITY
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