A method for preparing water-based fracturing fluid by using multi-effect thickener

A water-based fracturing and thickening agent technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as complex procedures and impact on fracturing fluid performance, improve liquid quality, and destroy crude oil emulsification , the effect of reducing surface and interfacial tension

Inactive Publication Date: 2011-12-21
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Due to the presence of fracturing fluid thickeners and numerous additives in the above fracturing fluid, the on-site construction process is complicated, and the performance of the fracturing fluid will be affected to varying degrees due to the wrong addition or addition of certain additives

Method used

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  • A method for preparing water-based fracturing fluid by using multi-effect thickener
  • A method for preparing water-based fracturing fluid by using multi-effect thickener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of multi-effect thickener: Weigh the raw materials according to the following weights for mixing and compounding:

[0038] Vegetable gum or hydroxypropyl, hydroxyethyl, carboxymethylated derivatives of vegetable gum 1000kg

[0039] Inorganic alkali 200kg

[0040] R1X 50kg

[0041] R2X 300kg

[0042] R3X 300kg

[0043] Inorganic or organic acid 200kg

[0044] Water 550kg

[0045] The substance after the chemical reaction is dried and pulverized to obtain the multi-effect thickener; the R1 means that the molecular formula is substances, where m≤5, n≤5; R2 means that the molecular formula is substances, where m≤5; R3 means that the molecular formula is substances, where m≥2, n≥3; X refers to chlorine (Cl) or bromine (Br), and in this example, X refers to chlorine (Cl);

[0046] The vegetable gum refers to one of guar gum, coriander gum, kale gum, cellulose, konjac gum, and quercetin bean gum. This example is guar gum.

[0047] Described inorganic a...

Embodiment 2

[0049] Basically the same as Example 1, the difference is

[0050] Vegetable gum or hydroxypropyl, hydroxyethyl, carboxymethylated derivatives of vegetable gum 1000kg

[0051] Inorganic alkali 10kg

[0052] R1X 10kg

[0053] R2X 10kg

[0054] R3X 10kg

[0055] Inorganic or organic acid 10kg

[0056] water 100kg

[0057] In this embodiment, X refers to bromine (Br); plant gum: coumarin is used; the inorganic base is calcium hydroxide, and organic acid: oxalic acid is used.

Embodiment 3

[0059] Basically the same as Example 1, the difference is

[0060] Vegetable gum or hydroxypropyl, hydroxyethyl, carboxymethylated derivatives of vegetable gum 1000kg

[0061] Inorganic alkali 300kg

[0062] R1X 100kg

[0063] R2X 500kg

[0064] R3X 500kg

[0065] Inorganic or organic acid 300kg

[0066] Water 1000kg

[0067] In this embodiment, X refers to bromine (Br); the derivative of coumarin hydroxypropyl is used; the inorganic base is calcium hydroxide, and the organic acid: oxalic acid is used.

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Abstract

The invention discloses a method for preparing a water-based fracturing fluid by using a multi-effect thickener, which is characterized in that the fracturing fluid is composed of a base fluid and a cross-linking fluid containing a gel breaker, and is mixed according to the following parts by weight Uniform: 60-99.99 parts of base liquid, 0.01-40.0 parts of cross-linking liquid containing gel breaker; the base liquid is mixed according to the following parts by weight: 99-99.9 parts of water, multi-effect Thickener is 0.1-1.0 parts; the cross-linking liquid containing breaker is mixed according to the following parts by weight: water is 0-99.9 parts, cross-linking agent is 0.1-100.0 parts and breaker is 0.001- 0.1 part. The water-based fracturing fluid formulated with this multi-effect thickener can meet the requirements of use without adding bactericides, clay stabilizers, surfactants, demulsifiers, and foaming agents. Under the condition that the performance indicators of the fracturing fluid are equivalent to those of the traditional fracturing fluid, the operation process is simplified, which is more conducive to improving the quality of the fluid, reducing the conditions required for monitoring, reducing construction procedures and time applications.

Description

technical field [0001] The invention relates to a method for preparing water-based fracturing fluid used in the fracturing and stimulation process of oil wells or natural gas wells, in particular to a method for preparing water-based fracturing fluid by using a multi-effect thickener. Background technique [0002] In the existing hydraulic fracturing technology for oil and gas wells, plant gums and their related chemically modified derivatives are used as thickeners for fracturing fluids, occupying a dominant position. These vegetable gums mainly include: [0003] Guar gum, cougar gum, kale gum, cellulose, konjac gum and chemically modified derivatives. [0004] In addition to the above-mentioned vegetable gum thickeners, relevant additives must be added to the fracturing fluid in order to improve the overall performance of the fracturing fluid and reduce the damage of the fracturing fluid to oil and gas reservoirs. [0005] The additives that must be added to the commonly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 孙虎刘国良张冕廖乐军韩文哲李婧赵文钢吕莉郭伟林
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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