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Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof

A nanoemulsion and water fracturing technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of large particle size of polymer crosslinking system, easy blockage of gas flow channels, and high injection pressure , to achieve the effect of reducing water phase permeability, obvious water control effect and low surface tension

Active Publication Date: 2014-08-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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 It is not suitable for water control fracturing fluid in tight gas reservoirs, otherwise it will not only cause the injection pressure to be too high during the fracturing process, but also easily block the gas flow channel and cause reservoir damage

Method used

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  • Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof
  • Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof
  • Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] a. At room temperature, add 20g of sodium dodecyl sulfate (SDS) and 11g of n-butanol to 50g of amino silicone oil (ammonia value 0.6), mix in a 250mL beaker, stir at 250r / min for 20min, then add 0.5 g acetic acid and 50mL deionized water, continue to stir for 30min, add 6gNaCl and 50mL deionized water, continue to stir for about 10min until homogeneous, and obtain amino silicone oil nanoemulsion.

[0037] b. Take 0.3~0.5 parts of amino silicone oil nano-emulsion and add it to 100 parts of water, mix evenly to obtain a homogeneous transparent bluish liquid, which is the nano-emulsion water-controlling fracturing fluid.

[0038] figure 1 It is an electron microscope photo of the nanoemulsion type water control fracturing fluid prepared in Example 1. The figure shows that the particle size of the product is relatively uniform, and the particle size is about 20nm-30nm.

Embodiment 2

[0040] a. At room temperature, add 15g of fatty alcohol polyoxyethylene ether (AEO-9) and 12g of n-butanol into 50g of amino silicone oil (ammonia value 0.3), mix in a 250mL beaker, stir at 200r / min for 20min, then Add 0.35g of acetic acid and 50mL of deionized water, continue to stir for 30min, add 5gNaCl and 50mL of deionized water, continue to stir for about 10min until homogeneous, and obtain amino silicone oil nanoemulsion.

[0041] b. Take 0.3~0.5 parts of amino silicone oil nano-emulsion and add it to 100 parts of water, mix evenly to obtain a homogeneous transparent bluish liquid, which is the nano-emulsion water-controlling fracturing fluid.

Embodiment 3

[0043] a. At room temperature, add 15g of octylphenol polyoxyethylene ether (OP-10) and 12g of n-butanol to 50g of amino silicone oil (ammonia value 0.3), mix in a 250mL beaker, stir at 150r / min for 25min, Then add 0.4g acetic acid and 50mL deionized water, continue to stir for 30min, add 5gNaCl and 50mL deionized water, continue to stir for about 10min until homogeneous, and obtain a viscous liquid containing more white bubbles. After standing until the bubbles disappear, you get Amino silicone oil nanoemulsion.

[0044]b. Take 0.3~0.5 parts of amino silicone oil nano-emulsion and add it to 100 parts of water, mix evenly to obtain a homogeneous transparent bluish liquid, which is the nano-emulsion water-controlling fracturing fluid.

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Abstract

The invention relates to a nanometer emulsion type water control fracturing fluid for a tight gas reservation well and a preparation method of the nanometer emulsion type water control fracturing fluid. The nanometer emulsion type water control fracturing fluid is prepared by 0.3-0.5 part of amino silicon oil nanometer emulsion and 100 parts of water by weight. The preparation method comprises the following steps of: adding an emulsifying agent and a low-molecule alcohol into the amino silicon oil; uniformly mixing the emulsifying agent, the low-molecule alcohol and the amino silicon oil; adding an organic acid and some water; continuously stirring, then adding an electrolyte and the rest water, stirring until the phase is homogeneous, and then obtaining amino silicon oil nanometer emulsion. The preparation process mentioned in the invention is simple, the process is easy to control, and the nanometer emulsion type water control fracturing fluid obtained has hydrophobicity, obvious water control effect, low viscosity, small grain size, low surface tension and stable performance, so the nanometer emulsion type water control fracturing fluid is suitable for water control fracturing improvement of a near-water or high-water content tight gas reservation well.

Description

technical field [0001] The invention relates to a water-controlled fracturing reconstruction for gas wells in tight gas reservoirs with high water content and low permeability, in particular to a nano-emulsion water-controlled fracturing fluid for tight gas reservoirs 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68E21B43/26
Inventor 罗明良孙厚台温庆志刘飞刘卓高遵美郭烨杨国威
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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