Preparation method and application of profile control agent

A technology of profile control agent and oxidant, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems that easily cause safety accidents, achieve no secondary pollution, mild reaction conditions, improve the adjustment The effect of sealing and channeling ability

Active Publication Date: 2021-07-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a preparation method and application of a profile control agent, which can solve the problem of safety accidents in related technologies

Method used

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  • Preparation method and application of profile control agent

Examples

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Effect test

preparation example Construction

[0030] In a first aspect, an embodiment of the present invention provides a method for preparing a profile control agent, see figure 1 , the method includes:

[0031] Step 101 : adding water and natural rice husks to the liquid preparation tank in sequence at a preset temperature, and mixing them evenly to obtain a first suspension.

[0032] It should be noted that the preset temperature may be preset according to the usage requirements, for example, the preset temperature may be 15-25°C. For example, the preset temperature may be 15°C, 20°C, 25°C, or the like.

[0033] It should be noted that the mass ratio between water and natural rice husk may be 1:20-1:100, for example, the mass ratio of water and natural rice husk may be 1:20, 1:40, 1:60, 1:80 or 1:100 etc.

[0034] Step 102: adding an oxidant to the first suspension, stirring for a first preset time, the oxidant decomposes carbon-carbon double bonds, carbon-oxygen bonds and benzene rings in the lignin contained in th...

Embodiment 1

[0065] Add 20kg (kg) of water and 1kg of natural rice husks to the dosing tank at 25° C., mix well to obtain a first suspension; then feed into the first suspension with a concentration of 3mg / L of Ozone, and stir for 30min, ozone oxidation decomposes the lignin in the rice husk to obtain a second suspension, wherein the concentration of ozone is kept constant during the stirring process; then add citric acid to the second suspension, adjust the first suspension The pH value of the second suspension is 5.5 to obtain the third suspension; finally, 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin are added to 1kg of the third suspension, and the profile control agent is obtained by mixing uniformly.

[0066] After placing the profile control agent at a constant temperature of 60°C for 7 days, the viscosity of the profile control agent was measured with a DV-II viscometer, and the viscosity of the profile control agent was found to be 8450 mPa.s (mPa.s).

Embodiment 2

[0072] Add 60kg of water and 1kg of natural rice husks to the dosing tank in turn at 25°C, mix well to obtain a first suspension; then inject ozone with a concentration of 16mg / L into the first suspension, and Stirring for 75min, ozone oxidation decomposes the lignin in the rice husk to obtain a second suspension, wherein the concentration of ozone is kept constant during the stirring process; then citric acid is added to the second suspension to adjust the second suspension The pH value of the liquid is 5.5 to obtain the third suspension; finally, 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin are added to 1kg of the third suspension, and the profile control agent is obtained by mixing uniformly.

[0073] After placing the profile control agent at a constant temperature of 60°C for 7 days, the viscosity of the profile control agent was measured with a DV-II viscometer, and the viscosity of the profile control agent was found to be 11184 mPa.s.

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Abstract

The invention discloses a preparation method and application of a profile control agent, and belongs to the field of profile control plugging. The method comprises the following steps: sequentially adding water and natural rice husks into a liquid preparation tank at a preset temperature, and uniformly mixing to obtain a first suspension; adding an oxidizing agent into the first suspension, stirring for a first preset time, and decomposing carbon-carbon double bonds, carbon-oxygen bonds and benzene rings in lignin contained in the natural rice husks to obtain a second suspension; adding a pH value regulator into the second suspension, and regulating the pH value of the second suspension as a reference value to obtain a third suspension; and adding polyacrylamide and a cross-linking agent into the third suspension, and uniformly mixing to obtain the profile control agent. The natural rice husks in the profile control agent basically do not contain lignin, that is, the lignin contained in the natural rice husks does not influence the viscosity of the profile control agent, so that the profile control and channeling sealing capabilities of the profile control agent can be improved. The profile control agent is mild in reaction condition, simple in preparation method, easy to operate and free of pollution.

Description

technical field [0001] The application relates to the field of profile control and plugging, and in particular, to a preparation method and application of a profile control agent. Background technique [0002] In the process of water flooding development, due to the existence of reservoir heterogeneity or micro-fractures, dominant water flow channels will be formed in the reservoir, which in turn leads to the rapid advancement of injected water in the reservoir, resulting in the formation of "water channeling in high-permeability layers". , the low-permeability layer has not been affected by water flooding”, resulting in a rapid rise in water cut, a rapid decline in production and even flooding of oil wells. Therefore, it is necessary to use a profile control agent to effectively plug the high permeability layer in the reservoir, so as to ensure that the injected water can flow to the low permeability layer, thereby reducing the water cut of the oil well. [0003] The relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512E21B33/13E21B43/20
CPCC09K8/512E21B33/13E21B43/20
Inventor 袁肖肖葛红江杨卫华雷齐玲程静郭志强熊英魏玉莲
Owner PETROCHINA CO LTD
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