Fracturing fluid resistant to low pH value environment and high salinity and preparation method thereof

A technology of salinity and fracturing fluid, applied in the field of fracturing fluid, can solve the problem of high pH usage limitation, and achieve the effect of reducing residue content and reducing damage

Active Publication Date: 2018-03-30
SHAANXI BANGXI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of fracturing fluid that can withstand low pH value environment and higher salinity and its preparation method, improve the carrying capacity of acid, and solve the problem of high pH use restriction existing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] At room temperature, 1.5 g of erucamidopropyl dimethylamine, 0.2 g of propylene glycol ether, and 0.8 g of glacial acetic acid were mixed to form a liquid component. When using, dissolve 0.2g of polyethylene oxide in 100g of water first, then pour the liquid components into the solution, stir for 2-3min to form acid-resistant fracturing fluid, at pH 7, the shear rate is 100s -1 The viscosity is 120mPa.s at 120 mPa.s, and the viscosity of 90mPa.s can still be obtained when the pH is lowered to 3.

Embodiment 2

[0056] At room temperature, 1.5 g of erucamidopropyl dimethylamine, 0.3 g of propylene glycol methyl ether, and 0.4 g of phosphoric acid were mixed to form a liquid component. When using, dissolve 0.2g of polyethylene oxide in 100g of water first, then pour the liquid components into the solution, stir for 2-3min to form acid-resistant fracturing fluid, at pH 7, the shear rate is 100s -1 The viscosity is 110mPa.s when the pH is reduced to 3, and the viscosity of 85mPa.s can still be obtained.

Embodiment 3

[0058] At room temperature, 1.5 g of tetradecyl dimethyl amine oxide, 0.3 g of propylene glycol ether, and 0.2 g of glacial acetic acid were mixed to form a liquid component. When using, dissolve 0.4g of polyethylene oxide in 100g of water first, then pour the liquid components into the solution, stir for 2-3min to form acid-resistant fracturing fluid, and the shear rate is 100s at pH 7 -1 The viscosity is 140mPa.s at the time, and the viscosity of 95mPa.s can still be obtained when the pH is lowered to 3.

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Abstract

The invention relates to a fracturing fluid capable of resisting low pH value environment and higher salinity and a preparation method thereof. Most conventional fracturing fluid can have favorable viscoelasticity only in an alkaline environment, and the natural vegetable glue used under normal conditions is difficulty for crosslinking under acidic conditions. The preparation method comprises the following steps: uniformly mixing a viscoelastic surfactant, an acid and a dispersion pour-point depressant to form a liquid component mixture; and dissolving a water-soluble nonionic polymer thickener at normal temperature, adding the liquid component mixture, and stirring uniformly to obtain the fracturing fluid. Under the condition of not using any crosslinking agent, the vermiform accumulation of the viscoelastic surfactant is utilized to coat the linear high-polymer part inside the viscoelastic surfactant, so that the linear high polymer generates the crosslinking-like effect due to the existence of the viscoelastic surfactant when meeting the acid and shrinking. The fracturing fluid has high viscosity in a neutral environment due to the linear high polymer, and thus, can not have the solid carrying capacity due to greatly lowered viscosity under acidic conditions.

Description

technical field [0001] The invention belongs to the technical field of fracturing fluid, and in particular relates to a fracturing fluid resistant to a low pH value environment and high salinity and a preparation method thereof. Background technique [0002] Fracturing fluid plays an important role in oilfield stimulation measures. Conventional fracturing fluids can only show good viscoelasticity in alkaline environments. However, in some special formation environments for acidizing treatment, or in special operating environments such as carbon dioxide injection, the fracturing fluid needs to work under acidic conditions and high salinity. The commonly used natural vegetable gums are relatively difficult to cross-link under acidic conditions. Linear polymer solutions that can produce higher viscosity and have a certain acid resistance cannot work independently because they are difficult to resist higher salinity and difficult to crosslink. Viscoelastic surfactants that ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/725C09K8/74C09K2208/30
Inventor 杨晓武秋列维刘娟萍李培枝白建壮
Owner SHAANXI BANGXI CHEM
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