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Nano-emulsion for fracturing water control and preparation method of nano-emulsion

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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 micro-nano scale, while the polymer cross-linking system or jelly system has large particle size and high viscosity, so Not suitable for water control fracturing fluid in tight gas reservoirs

Method used

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  • Nano-emulsion for fracturing water control and preparation method of nano-emulsion
  • Nano-emulsion for fracturing water control and preparation method of nano-emulsion
  • Nano-emulsion for fracturing water control and preparation method of nano-emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0058] At room temperature, take 20.0g of dihydroxy polydimethylsiloxane, the hydroxyl content is: 8.0%, the molecular weight is 16000, 5.0g of alkylphenol polyoxyethylene ether NP-10, 2.0g of fatty acid polyoxyethylene ester OEO- 103. Add 5.0g of n-propanol into the dihydroxypolydimethylsiloxane, stir at 100r / min for 30min, and then drop 33.0g of deionized water evenly within 15min at 50℃ under stirring at 400r / min into the oil phase to obtain a transparent and uniform liquid, which is the nanoemulsion for fracturing water control.

Embodiment 2

[0060] At room temperature, take 20.0g of dihydroxy polydimethylsiloxane, the hydroxyl content is: 12.0%, the molecular weight is 50000, 6.2g of alkylphenol polyoxyethylene ether NP-10, 3.0g of fatty acid polyoxyethylene ester OEO- 103. Add 6.0g of n-butanol into dihydroxy polydimethylsiloxane, stir at 100r / min for 30min, and then drop 40.0g of deionized water evenly within 15min at 80℃ under stirring at 800r / min into the oil phase to obtain a transparent and uniform liquid, which is the nanoemulsion for fracturing water control.

Embodiment 3

[0062] At room temperature, take 20.0g of dihydroxy polydimethylsiloxane, the hydroxyl content is: 8.0%, the molecular weight is 50000, 4.0g of alkylphenol polyoxyethylene ether NP-12, 4.0g of fatty acid polyoxyethylene ester OEO- 103. Add 3.0g of n-propylamine into the dihydroxy polydimethylsiloxane, stir at 100r / min for 25min, and then drop 35.0g of deionized water into the In the oil phase, a transparent and uniform liquid is obtained, which is the nanoemulsion for fracturing 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...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68C09K8/885
Inventor 侯向前任山张绍彬卢聪赵志红唐朝钧王梦莹寇将
Owner CHENGDU LEARN PRACTICES TECH CO LTD
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