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Alcohol-containing fracturing fluid and preparation method and application thereof

An alcohol pressure and ethanol technology, which is applied in chemical instruments and methods, earthwork drilling, and production fluids, etc., can solve the problem of inability to take into account solubility and fracturing performance, precipitation of thickeners, and inability to form stable fracturing fluid base fluid, etc. question

Active Publication Date: 2021-02-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the inventors found that the alcohol used in the alcohol-based fracturing fluids currently used in the field is mainly methanol, but when the alcohol content exceeds 20%, the thickener will precipitate out, and a stable fracturing fluid cannot be formed. base liquid, and when the concentration of alcohol is high, it is easy to cross-link and brittle the jelly
Some fracturing fluids containing ethanol or polyols cannot balance solubility and fracturing performance

Method used

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  • Alcohol-containing fracturing fluid and preparation method and application thereof
  • Alcohol-containing fracturing fluid and preparation method and application thereof
  • Alcohol-containing fracturing fluid and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0070] In the second aspect of the present invention, the present invention proposes a method for preparing alcohol-containing fracturing fluid, which is characterized in that, comprising:

[0071] Weigh the thickener, water, ethanol and ethylene glycol, add the thickener while stirring in the water until the thickener dissolves, then add the ethanol and ethylene glycol, and continue stirring to obtain a mixed solution. Seal the mixture and keep it warm;

[0072] Weighing the cross-linking agent, adding the cross-linking agent to the heat-preserved mixed solution while stirring, stirring and standing still to obtain alcohol-containing fracturing fluid.

[0073] In one or more embodiments of the present invention, during the process of adding the thickener, the speed of the mixer is constantly adjusted to keep the bottom of the vortex just to see the top of the central axis of the blade;

[0074] Further, after adding the thickener, stir for 3-8 minutes, preferably 5 minutes; ...

Embodiment 1

[0090] Example 1 Optimum preparation method of alcohol-containing fracturing fluid base fluid

[0091] In the experiment, two addition sequences were used to prepare alcohol-containing fracturing fluid base fluid. One method is to dissolve guar gum in water first, and then add alcohol after the guar gum is fully dissolved (method 1#); the other method is, Mix the alcohol and water well first, then add guar gum to the mixed solution (method 2#). In order to determine the preparation method, two methods were used to conduct the solubility experiment of the selected guar gum in ethanol solution.

[0092] Hydroxypropyl guar gum (HPG) and carboxymethyl hydroxypropyl guar gum (CMHPG) were selected to carry out the experiment, the addition amount was 0.4%, and the volume concentration of ethanol was changed from 0% to 60%. The experimental results are shown in Table 1.

[0093] Table 1 Guar Gum Alcohol Solubility Experiment Result

[0094]

[0095] From the experimental results,...

Embodiment 3

[0112] Example 3 Ethylene Glycol-Water Fracturing Fluid Performance Research

[0113] As a monohydric alcohol, the addition of ethanol can greatly improve the performance of fracturing fluid. However, modified guar gum can only be dissolved in systems with ethanol content below 60%. The ethylene glycol molecule contains two hydroxyl molecules, and its molecular structure is similar to that of water molecules. Low concentration of water reduces water-sensitive water lock damage during fracturing.

[0114] The solution was prepared by adding water-guar gum-ethylene glycol in order to test the solubility of two modified guar gums in ethylene glycol solution. The mass fraction of guar gum was tested at 0.4%, 0.8% and 1.2%, and the experimental results showed , within the normal scope of application, the solubility of the two kinds of guar gum in ethylene glycol solution does not change with the change of the mass fraction of guar gum added. Solubility.

[0115] The solubility ...

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Abstract

The invention belongs to the field of oil field fracturing fluid, and particularly relates to an alcohol-containing fracturing fluid and a preparation method and application thereof. The alcohol-containing fracturing fluid comprises ethanol, ethylene glycol, water, a thickening agent and a cross-linking agent. By adding ethanol, the phenomenon that part of properties become poor due to addition ofethylene glycol into the fracturing fluid can be improved, and along with increasing of the content of ethanol, the viscosity of the ethanol-ethylene glycol-water mixed solvent fracturing fluid is increased, the temperature resistance is good, the sand carrying capacity is enhanced, the viscosity of the gel breaking fluid is reduced, and the content of residues is reduced.

Description

technical field [0001] The invention belongs to the field of oilfield fracturing fluids, and in particular relates to an alcohol-containing fracturing fluid and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As conventional oil and gas resources are on the verge of depletion, the status of low-permeability and ultra-low-permeability tight sandstone oil and gas reservoirs is becoming more and more important. Enhanced recovery. Fracturing fluid is the core of fracturing technology and is known as the "blood" of fracturing. Low-permeability oil and gas reservoirs are characterized by deep burial, high formation temperature, high pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/685C09K8/665E21B43/26C09K2208/26
Inventor 范海明裴鹏程魏志毅于田田杨玉辉亓翔杨红斌李哲康万利戴彩丽
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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