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A kind of fracturing fluid thickener and its preparation and application

A fracturing fluid thickener and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as low viscosity, restricted fracturing scale, poor temperature resistance, etc., to achieve viscosity increase Good effect, improved yield, fast dissolution effect

Active Publication Date: 2015-08-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the clean fracturing fluid cannot meet the existing fracturing technology. Its low viscosity and poor temperature resistance restrict the scale of fracturing.

Method used

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  • A kind of fracturing fluid thickener and its preparation and application
  • A kind of fracturing fluid thickener and its preparation and application
  • A kind of fracturing fluid thickener and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation:

[0045] (1) Add 12g of acrylic acid monomer and 132g of water into a 500ml three-necked flask, start stirring and slowly add 6g of sodium carbonate, the feeding speed is based on the fact that the bubbles generated by the reaction do not overflow the three-necked flask, and stir for 20 minutes until fully dissolved;

[0046] (2) Slowly add 6g of 2-acrylamido-2-methylpropanesulfonic acid and stir for 20 minutes until fully dissolved;

[0047] (3) Add 30g of acrylamide monomer and 2g of dimethyl diallyl ammonium chloride (60% aqueous solution), stir for 20 minutes until fully dissolved; stir evenly, maintain the system temperature at 40 degrees, and pass nitrogen gas for 20 minutes;

[0048](4) Add 12ml of 1% potassium persulfate solution, continue to pass nitrogen for 30 minutes, stop stirring, and react for 4 hours to obtain a gel;

[0049] (5) The reaction product in step (4) is pulverized, dried and granulated to obtain the thickener.

Embodiment 2

[0051] (1) Add 16g of acrylic acid monomer and 118g of water into a 500ml three-necked flask, start stirring and slowly add 9g of sodium carbonate, the feeding speed is based on the fact that the bubbles generated by the reaction do not overflow the three-necked flask, and stir for 20 minutes until fully dissolved;

[0052] (2) Slowly add 10g of 2-acrylamido-2-methylpropanesulfonic acid, stir for 20min until fully dissolved;

[0053] (3) Add 35g of acrylamide monomer and 4g of dimethyl diallyl ammonium chloride (60% aqueous solution), stir for 20 minutes until fully dissolved; stir evenly, maintain the system temperature at 40 degrees, and pass nitrogen gas for 20 minutes;

[0054] (4) Add 8ml of 1% potassium persulfate solution, continue to pass nitrogen for 30 minutes, stop stirring, and react for 4 hours to obtain a gel;

[0055] (5) The reaction product in step (4) is pulverized, dried and granulated to obtain the thickener.

Embodiment 3

[0057] (1) Add 20g of acrylic acid monomer and 96g of water into a 500ml three-necked flask, start stirring and slowly add 12g of sodium carbonate, the feeding speed is based on the fact that the bubbles generated by the reaction do not overflow the three-necked flask, and stir for 20 minutes until fully dissolved;

[0058] (2) Slowly add 16g of 2-acrylamido-2-methylpropanesulfonic acid and stir for 20 minutes until fully dissolved;

[0059] (3) Add 40g of acrylamide monomer and 8g of dimethyl diallyl ammonium chloride (60% aqueous solution), stir for 20 minutes until fully dissolved; stir evenly, maintain the system temperature at 40 degrees, and pass nitrogen gas for 20 minutes;

[0060] (4) Add 8ml of 1% potassium persulfate solution, continue to pass nitrogen for 30 minutes, stop stirring, and react for 4 hours to obtain a gel;

[0061] (5) The reaction product in step (4) is pulverized, dried and granulated to obtain the thickener.

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Abstract

The invention relates to a fracturing fluid thickening agent and preparation and application thereof. The thickening agent is mainly prepared from the following components in percentage by weight: 15-20% of acrylamide monomer, 6-10% of acrylic monomer, 3-6% of sodium carbonate, 3-8% of 2-acrylamide-2-methylpropanesulsonic acid, 1-4% of dimethyldiallylammonium chloride (60% aqueous solution), 0.03-0.08% of potassium persulfate and the balance of water. The preparation comprises the following steps of: adding the acrylic monomer and water into a reaction kettle; starting stirring and slowly adding sodium carbonate, wherein the adding speed is proper when the bubbles generated by the reaction do not overflow out of the reaction kettle; stirring till sufficient dissolution; adding 2-acrylamide-2-methylpropanesulsonic acid, and stirring till sufficient and uniform mixing; adding the acrylamide monomer and dimethyldiallylammonium chloride, and stirring till sufficient dissolution; heating the reaction liquid to 40 DEG C, introducing nitrogen, and performing thermal insulation stirring for 20 minutes; adding potassium persulfate; continuously introducing nitrogen, and stirring for 30 minutes; stopping the stirring, and reacting for 4 hours to obtain gel; and grinding the reaction product, drying and granulating to obtain the thickening agent.

Description

technical field [0001] The invention relates to a fracturing fluid thickener and its preparation and application. Background technique [0002] Fracturing technology is one of the main measures to increase production in the middle and late stages of oilfield development, and the performance of the fracturing fluid system directly affects the effect of fracturing. At present, guar gum fracturing fluid is still the most widely used fracturing fluid system in my country. Since the raw material price of hydroxypropyl guar gum (grade 1) rose from 18,300 yuan / ton in 2010 to 158,000 yuan / ton in 2012, the cost of fracturing was greatly increased and the promotion of fracturing technology was restricted. Guar gum belongs to plants and is not suitable for storage. It is easy to be corrupted under high temperature in summer. [0003] Therefore, it is imminent to develop new low-residue and low-cost fracturing fluids. After more than a year of scientific research, the technicians of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 吴志俊张子明李玉印李超包放关伟张军孙兴任龙李霞罗淇峰陈楠
Owner PETROCHINA CO LTD
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