Water-based fracturing fluid gelatinizer and producing method thereof

A water-based fracturing and thickening agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to withstand ultra-high temperature, residual glue adsorption and clogging, poor shear resistance, etc., to achieve durable Good high temperature performance, high shear resistance, good sand carrying performance

Inactive Publication Date: 2008-07-16
NANTONG KEYI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General synthetic polymers include polyacrylamide, methylene polyacrylamide, etc. These polymers can change the properties of polymers by controlling the synthesis conditions, meet the construction needs, and have good resistance reduction performance, but the existing problem is poor shear resistance. ;Poor salt resistance;Residual glue adsorption and clogging are serious
In recent years, the performance of oligomer fracturing fluids has made up for the shortcomings of general polymers, but the disadvantage of oligomers is that they cannot withstand ultra-high temperatures, and can generally be used under 90-120°C bottom layers, while for some For high-temperature wells exceeding 150°C, oligomers and guar gum are no longer suitable. They contain hydrolyzable groups, which can be hydrolyzed to break chains under high temperature conditions, and lose the use of fracturing to thicken and carry sand , seam-making role, so the research and development of new thickeners with high temperature resistance and oligomer performance is a new scientific research topic for domestic and foreign researchers.

Method used

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  • Water-based fracturing fluid gelatinizer and producing method thereof
  • Water-based fracturing fluid gelatinizer and producing method thereof
  • Water-based fracturing fluid gelatinizer and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The weight percent of each monomer and water: DMAA: DADMAC: AN: DMC (DAC): H 2 O=30:15:6:14:35.

[0040] Preparation of the solution: add 350g of distilled water to a 2000ml beaker, add 300g of DMAA monomer, 150g of DADMAC monomer, add 60g of AN monomer, add 140g of DMC (DAC) monomer, stir and dissolve for 30 minutes, slowly add in And agent (sodium hydroxide) to pH4.5. The stirring solution was continued to ripen for 30 minutes.

[0041] Adjustment of the solution: adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0042] Polymerization of the solution: Blow nitrogen to remove oxygen for 15-20 minutes, add catalyst V650.5g / L, V50 0.05g / L, ammonium persulfate 0.03g / L, sodium formaldehyde sulfoxylate 0.03g / L in sequence under nitrogen protection , stop blowing nitrogen and seal the polymerization tank, induce for 15-20 minutes, and observe whether there is a temperature rise. When there is a temperature rise of 2°C during the induction perio...

Embodiment 2

[0045] The weight percent of each monomer in water: DMAA: DADMAC: AN: DMC (DAC): H 2 O=25:15:6:14:40.

[0046] Preparation of the solution: Add 400g of distilled water to a 2000ml beaker, add 250g of DMAA monomer, 150g of DADMAC monomer, add 60g of AN monomer, add 140g of DMC (DAC) monomer, stir and dissolve for 30 minutes, slowly add in And agent (sodium hydroxide) to pH4.5. The stirring solution was continued to ripen for 30 minutes.

[0047] Adjustment of the solution: adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0048] Polymerization of the solution: Blow nitrogen to remove oxygen for 15-20 minutes, add catalyst V650.5g / L, V50 0.04g / L, ammonium persulfate 0.03g / L, sodium formaldehyde sulfoxylate 0.03g / L in sequence under nitrogen protection , stop blowing nitrogen and seal the polymerization tank, induce for 15-20 minutes, and observe whether there is a temperature rise. When there is a temperature rise of 2°C during the induction period...

Embodiment 3

[0051] The weight percent of each monomer and water: DMAA: DADMAC: AN: DMC (DAC): H 2 O=30:15:8:14:33.

[0052] Preparation of the solution: Add 330g of distilled water into a 2000ml beaker, add 300g of DMAA monomer, 150g of DADMAC monomer, add 80g of AN monomer, add 140g of DMC (DAC) monomer, stir and dissolve for 30 minutes, slowly add in And agent (sodium hydroxide) to pH4.5. The stirring solution was continued to ripen for 30 minutes.

[0053] Adjustment of the solution: adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0054] Polymerization of liquid: Blowing nitrogen to remove oxygen for 15-20 minutes, under the protection of nitrogen, add catalyst V650.8g / L, V50 0.08g / L, ammonium persulfate 0.04g / L, sodium formaldehyde sulfoxylate 0.04g / L , stop blowing nitrogen and seal the polymerization tank, induce for 15-20 minutes, and observe whether there is a temperature rise. When there is a temperature rise of 2°C during the induction period, it...

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Abstract

The invention provides a thickener used for water-base fracturing fluid, and is used for increasing yield and fracturing operation of oil field. The thickener comprises N, N to dialkyl acrylamide, dimethyl diallyl ammonium chloride, acrylonitrile, and methacryloyloxyethyl trimethyl ammonium chloride or acryloyloxyethyl trimethyl ammonium chloride. A method for producing the thickener is a water solution catalyst method is used for producing free radical, thus leading the monomer to polymerize. The thickener provided by the invention has the advantages of resisting high temperature 250 DEG C, resisting cutting, resisting salt, and no leftover, etc.

Description

technical field [0001] The invention relates to a thickener for water-based fracturing fluid, especially a polymer thickener with high temperature resistance up to 250 DEG C, and a production method of the thickener. Background technique [0002] Fracturing is a conventional stimulation technique. Its purpose is to press the reservoir out of the fracture, 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 water-based fracturing fluid, the thickener is used to increase the viscosity of the fracturing fluid, reduce the fluid loss of the fracturing fluid, suspend and carry the proppant. [0003] The currently used thickener raw materials include vegetable gu...

Claims

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Application Information

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IPC IPC(8): C09K8/62
Inventor 郝春玲王鑫李国
Owner NANTONG KEYI CHEM
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