High-strength temperature resistant viscoelastic fracturing fluid copolymer

A copolymer and viscoelastic technology, which is applied in the field of high-strength temperature-resistant viscoelastic fracturing fluid copolymer, can solve the problems of good shear resistance and achieve easy operation, good temperature resistance and shear resistance, and high yield Effect

Active Publication Date: 2013-02-13
DAQING HUAYING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no fracturing fluid copolymer with good shear resistance and high sand-carrying properties

Method used

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  • High-strength temperature resistant viscoelastic fracturing fluid copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Take 21.5% of acrylamide, 9.5% of 2-acrylamido-2-methyl-1-propanesulfonate, and 4.8% of 3-acrylimido-3-methylbutyric acid Add it into deionized water, fully dissolve, then add 8.5% acrylic acid and stir evenly, neutralize with sodium hydroxide to PH=5~6, finally add 0.75% dodecanethiol, control the temperature at room temperature, pour it into a sealed insulation Nitrogen is passed through the reactor with a thermometer for 30 minutes, and then 0.02% initiator ammonium persulfate and 0.02% initiator sodium bisulfite are added. After 10 to 20 minutes, the nitrogen gas is stopped, and the reaction is 2 to 3 hours to obtain a viscous Gel-like polymer is further dried and granulated to finally obtain a high-strength temperature-resistant viscoelastic fracturing fluid copolymer.

Embodiment 2

[0033] Example 2: Take 30% of acrylamide, 2% of 2-acrylamido-2-methyl-1-propanesulfonate, 2% of 3-acrylimido-3-methylbutyric acid Add it into deionized water, fully dissolve, then add 5% acrylic acid and stir evenly, neutralize with sodium hydroxide to PH=5~6, finally add 2% dodecanethiol, control the temperature at room temperature, pour it into a sealed insulation Nitrogen is passed through the reactor with a thermometer for 30 minutes, and then 0.02% initiator ammonium persulfate and 0.02% initiator sodium bisulfite are added. After 10 to 20 minutes, the nitrogen gas is stopped, and the reaction is 2 to 3 hours to obtain a viscous Gel-like polymer is further dried and granulated to finally obtain a high-strength temperature-resistant viscoelastic fracturing fluid copolymer.

Embodiment 3

[0034] Example 3: Take 25% of acrylamide, 5% of 2-acrylamido-2-methyl-1-propanesulfonate, and 1% of 3-acrylimido-3-methylbutyric acid Add it into deionized water, fully dissolve, then add 7% acrylic acid and stir evenly, neutralize with sodium hydroxide to PH = 5~6, finally add 1.5% dodecanethiol, control the temperature at room temperature, pour into the sealed insulation Nitrogen is passed through the reactor with a thermometer for 30 minutes, and then 0.02% initiator ammonium persulfate and 0.02% initiator sodium bisulfite are added. After 10 to 20 minutes, the nitrogen gas is stopped, and the reaction is 2 to 3 hours to obtain a viscous Gel-like polymer is further dried and granulated to finally obtain a high-strength temperature-resistant viscoelastic fracturing fluid copolymer.

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Abstract

The invention discloses high-strength temperature resistant viscoelastic fracturing fluid copolymer which is characterized by comprising the following components in mass percent, 5 to 20 percent of acrylic acid, 10 to 30 percent of acrylic amide, 2 to 15 percent of 2-acrylamide-2-methyl-1-propane sulfonate, 1 to 10 percent of 3-acryloyl imidogen-3-methylbutyric acid, 0.1 to 2 percent of lauryl mercaptan, and the balance of deionized water. The copolymer does not have water-insoluble residue, and has good sand-carrying effect and high-temperature resistance and shearing resistance, the viscosity of the copolymer with the mass fraction being 0.45 percent is kept more than 70 percent after continuous shearing for 1 hour at 170S-1 and below 120 DEG C. Raw material of the copolymer adopts industrial products, and is not required to be purified before reaction. Organic solvent is not used, the copolymer does not pollute the environment, the product yield is high, the reaction process is simple, the operation is easy, and the price is low.

Description

technical field [0001] The invention relates to a high-strength temperature-resistant viscoelastic fracturing fluid copolymer. Background technique [0002] Fracturing technology is a conventional stimulation technology, the purpose of which is to press the reservoir out of fractures, thereby increasing production. The fracturing fluid used in fracturing must have the characteristics of high viscosity, high shear resistance, high sand-carrying strength and environmental protection without residue after breaking the gel. High viscosity can make cracks, and only high viscosity can make the cracks reach the required width and depth. As the main agent of fracturing fluid, the copolymer is used to increase the viscosity of fracturing fluid, reduce the fluid loss of fracturing fluid, suspend and carry proppant. [0003] Fracturing fluid can increase oil well production and water well injection. Commonly used fracturing fluids can be divided into two types: oil-based fracturing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/06C08F220/52C08F2/01C08F4/40C09K8/68
Inventor 孙安顺
Owner DAQING HUAYING CHEM IND
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