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Strong gas-wetting nanosilicon dioxide water block removal agent, preparation method thereof and method for wetting transition of rock surface

A technology of nano-silica and water-dissolving and locking agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of limited effect, not well applicable to low-permeability oil and gas reservoirs, etc., to improve flow conditions, relieve Effect of water lock damage and enhanced oil and gas recovery

Active Publication Date: 2015-03-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] The wettability inversion treatment agents used in the above methods do not use gas-moisture nanomaterials to treat low-permeability oil and gas reservoirs with water locking effect, and the effect is limited, so they cannot be well applied to low-permeability oil and gas reservoirs

Method used

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  • Strong gas-wetting nanosilicon dioxide water block removal agent, preparation method thereof and method for wetting transition of rock surface
  • Strong gas-wetting nanosilicon dioxide water block removal agent, preparation method thereof and method for wetting transition of rock surface
  • Strong gas-wetting nanosilicon dioxide water block removal agent, preparation method thereof and method for wetting transition of rock surface

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Embodiment Construction

[0012] Technical scheme of the present invention is as follows:

[0013] A modified nano silicon dioxide dehydration locking agent, the mass percentage of raw materials is composed as follows:

[0014]

[0015] The remainder is water;

[0016] The modified nano-silica is: using a fluorocarbon surfactant aqueous solution with a mass fraction of 0.05% to 0.3% as a modification treatment solution, and modifying the surface of the nano-silica particles at a temperature of 65-75°C Obtain; Wherein, described fluorocarbon surfactant is perfluoroethyl acrylate, general formula is as follows:

[0017] CF 3 CF 2 (CF 2 ) k CH 2 CH 2 OOCCR=CH 2

[0018] Where K is an integer of 1-20, R is H or CH 3 . Preferably, K is an integer of 5-10, and R is H.

[0019] Preferably according to the present invention, the mass ratio of nano silicon dioxide:modification treatment liquid=(1~2):10.

[0020] The above-mentioned perfluoroethyl acrylate is a non-ionic fluorocarbon surfactant, ...

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Abstract

The invention relates to a strong gas-wetting nanosilicon dioxide water block removal agent, a preparation method thereof and a method for wetting transition of rock surface. The modified nanosilicon dioxide water block removal agent comprises the following raw materials: 0.1-0.5% of modified nanosilicon dioxide, 0.5-1% of an emulsifying agent OP-10, 0.5-1% of lauryl sodium sulfate, 25-50% of ethyl alcohol and the balance of water; the nanosilicon dioxide modified treating fluid is 0.05-0.3% of a non-ionic fluorocarbon surfactant water solution. The invention further provides a preparation method and application of the modified nanosilicon dioxide water block removal agent. The modified nanosilicon dioxide material has a super-hydrophobic and super-oleophobic property, can be used for changing the liquid-wetting property of the rock surface into strong gas-wetting property, so as to reduce the viscous resistance of fluid flowing on the rock surface, improve the flowing status of fluid in a porous medium, remove water blocking damage, is used for low-permeability oil and gas field exploitation and increasing of the oil and gas recovery ratio.

Description

technical field [0001] The invention relates to a water-dissolving and locking agent of strong gas-wettable nano-silica modified by a fluorocarbon surfactant, a preparation method thereof and a rock surface wetting reversal method, belonging to the technical field of low-permeability oil and gas field exploitation. Background technique [0002] The distribution of low-permeability oil and gas resources in my country has the characteristics of rich oil and gas, various types of oil and gas reservoirs, wide distribution area, and "gas in the upper part and oil in the lower part, mainly marine gas and continental oil and gas". At present, the proved reserves of low-permeability oil and gas reservoirs account for more than 2 / 3 of the total oil and gas reserves in the country. As my country's major oil fields have entered the middle and late stages of development and energy is in short supply, it is of key strategic significance to vigorously develop low-permeability oil and gas r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/594
CPCC09K8/584C09K8/594
Inventor 王彦玲金家锋刘飞任金恒王坤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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