Method for preparing environmentally-friendly type water-based fracturing fluid by utilizing environmentally-friendly type multiple-effect thickening agent

A water-based fracturing and environmental-friendly technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as many quality control and supervision points, high safety and environmental risks, and impact on fracturing fluid performance. Achieve the effect of reducing the conditions required for monitoring, reducing construction procedures, and reducing surface and interfacial tension

Active Publication Date: 2014-08-20
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] Based on the presence of fracturing fluid thickeners and numerous additives in the above fracturing fluid, the on-site construction procedures are complicated, and there are many quality control and supervision points, and the performance of the fracturing fluid will be affected due to the wrong addition or addition of certain additives. varying degrees of influence
High safety and environmental risks

Method used

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  • Method for preparing environmentally-friendly type water-based fracturing fluid by utilizing environmentally-friendly type multiple-effect thickening agent
  • Method for preparing environmentally-friendly type water-based fracturing fluid by utilizing environmentally-friendly type multiple-effect thickening agent
  • Method for preparing environmentally-friendly type water-based fracturing fluid by utilizing environmentally-friendly type multiple-effect thickening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of environment-friendly multi-effect thickener: Weigh the raw materials according to the following weights for mixing and compounding:

[0037]

[0038] The chemically reacted material is dried and pulverized to obtain the environmental-friendly 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 a≤5; R3 means that the molecular formula is The substance, wherein c≥2, d≥3; X refers to chlorine (Cl) or bromine (Br), and in this embodiment, X refers to chlorine (Cl);

[0039] The environment-friendly vegetable gum refers to one of guar gum, coriander gum, kale gum, cellulose, konjac gum, and quercetin bean gum. This example is guar gum.

[0040] Described inorganic alkali is the one in sodium hydroxide, potassium hydroxide, calcium hydroxide, aluminum hydroxide, barium hydroxide; Described inorganic acid is the one in hydrochloric acid, sulfuric acid, ni...

Embodiment 2

[0042] Basically the same as Example 1, the difference is

[0043]

[0044] In this embodiment, X refers to bromine (Br); what adopts is an environment-friendly vegetable gum: coumarin; the inorganic base is calcium hydroxide, and what adopts is an organic acid: oxalic acid.

Embodiment 3

[0046] Basically the same as Example 1, the difference is

[0047]

[0048]

[0049] In this embodiment, X refers to bromine (Br); what adopts is a derivative of coumarin hydroxypropyl; the inorganic base is calcium hydroxide, and what adopts is an organic acid: oxalic acid.

[0050] The molecular weight of the environment-friendly vegetable gum or the hydroxypropyl, hydroxyethyl, and carboxymethylated derivatives of the environment-friendly vegetable gum described in the above Examples 1-3 is 1-400,000.

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Abstract

The invention discloses a method for preparing an environmentally-friendly type water-based fracturing fluid by utilizing an environmentally-friendly type multiple-effect thickening agent. The method is characterized in that the fracturing fluid consists of a base fluid and a crosslinking liquid and is obtained by evenly mixing 60-99.99 weight parts of base fluid and 0.01-40.0 weight parts of crosslinking liquid, wherein the base fluid is obtained by mixing the following components in parts by weight: 99-99.9 parts of water and 0.1-1.0 part of environmentally-friendly type multiple-effect thickening agent; and the crosslinking liquid is obtained by mixing the following components in parts by weight: 0-99.9 parts of water and 0.1-100.0 parts of crosslinking agent. According to the invention, the fracturing fluid can achieve use requirement even if a bactericide, a clay stabilizer, a surface active agent, a demulsifier and a foaming agent are added no longer. According to the method disclosed by the invention, operation process is simplified, thereby being more beneficial to improvement of liquid quality, reduction of conditions required by monitoring and reduction of construction process and application time.

Description

technical field [0001] The present invention relates to a method for preparing an environment-friendly fracturing fluid used in the fracturing and stimulation process of an oil well or a natural gas well, in particular to a method for preparing an environment-friendly water-based fracturing fluid using an environment-friendly 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. 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. At the same time, becau...

Claims

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Application Information

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Patent Type & Authority Patents(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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