Nano-emulsion for fracturing water control and preparation method of nano-emulsion
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A technology for nanoemulsions and water, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of large particle size, high viscosity, poor physical properties, etc., and achieve low surface tension, low viscosity, and low permeability Effect
Active Publication Date: 2018-04-06
CHENGDU LEARN PRACTICES TECH CO LTD
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[0004] The main agents of existing water-control fracturing fluids are mostly high-molecular-weight polymers, the physical properties of tight gas reservoirs are poor, and the pore size is m
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[0057] Example 1
[0058] At room temperature, take 20.0g dihydroxy polydimethylsiloxane, hydroxyl content: 8.0%, molecular weight 16000, 5.0g alkylphenol polyoxyethylene ether NP-10, 2.0g fatty acid polyoxyethylene ester OEO- 103,5.0g of n-propanol was added to the dihydroxy polydimethylsiloxane, stirred at 100r / min for 30min, and then at 50℃, 400r / min stirring, 33.0g of deionized water was dropped uniformly within 15min Into the oil phase, a transparent and uniform liquid is obtained, which is a nanoemulsion for fracturing water control.
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[0059] Example 2
[0060] At room temperature, take 20.0g dihydroxy polydimethylsiloxane, the hydroxyl content is 12.0%, the molecular weight is 50000, 6.2g alkylphenol polyoxyethylene ether NP-10, 3.0g fatty acid polyoxyethylene ester OEO- 103,6.0g of n-butanol was added to the dihydroxy polydimethylsiloxane, stirred at 100r / min for 30min, and then at 80℃, 800r / min stirring, 40.0g of deionized water was dropped uniformly within 15min Into the oil phase, a transparent and uniform liquid is obtained, which is a nanoemulsion for fracturing water control.
Example Embodiment
[0061] Example 3
[0062] At room temperature, take 20.0g dihydroxy polydimethylsiloxane, the hydroxyl content is: 8.0%, the molecular weight is 50000, 4.0g alkylphenol polyoxyethylene ether NP-12, 4.0g fatty acid polyoxyethylene ester OEO- 103,3.0g of n-propylamine was added to the dihydroxy polydimethylsiloxane, stirred at 100r / min for 25min, and then at 40℃, 500r / min stirring, 35.0g of deionized water was dropped uniformly in 20min In the oil phase, a transparent and uniform liquid is obtained, which is a nanoemulsion for fracturing and water control.
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Abstract
The invention provides nano-emulsion for fracturing water control and a preparation method of the nano-emulsion. In a fracturing process of a tight gas well, the nano-emulsion for fracturing water control is injected into a tight gas reservoir along with fracturing fluid; the nano-emulsion for fracturing water control has hydrophobicity and stable adsorbability, after entering a stratum, the nano-emulsion for fracturing water control is adsorbed to surfaces of rock pores, and can resist water washing, water phase permeability can be reduced greatly, and the reduction amplitude reaches 70% or above; influence to gas phase permeability is quite low, the nano-emulsion has the characteristic of changing phase permeability selectively, and a water control effect is obvious; viscosity is low, surface tension is also low, the nano-emulsion is injected easily, and thus, the nano-emulsion is particularly suitable for the tight gas reservoir; and furthermore, the nano-emulsion is compatible to reservoir fluid well, and is good in shear stability, thermal stability and salt stability. Under the condition that influence to the gas phase permeability is quite low, the purpose of controlling water is achieved.
Description
technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a nanoemulsion for fracturing water control and a preparation method thereof. Background technique [0002] It is difficult for low-permeability tight gas reservoirs to obtain industrial gas flow before fracturing and other production stimulation. The artificial fractures formed by fracturing of high-water-cut and low-permeability tight gas wells can easily lead to rapid rise of water cut in gas wells. Can it solve the problem of water cut in tight gas wells after fracturing? The problem of rapid rise and gas well stimulation is a problem that gas field workers at home and abroad generally want to solve. With the increasing proportion of tight gas reservoir reserves in natural gas energy, the development of tight sandstone gas has become one of the hot issues. For this reason, gas field workers at home and abroad have also increased their research efforts on the develo...
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