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A kind of water-based fracturing fluid thickener and its synthesis method

A water-based fracturing and thickening agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of residues remaining in formations and fractures, high content of water-insoluble substances, and complicated preparation processes, etc. Achieve high temperature resistance, wide operating temperature range, and good sand-carrying performance

Active Publication Date: 2018-02-06
YANTAI RUNXING ENVIRONMENTAL PROTECTION TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is reported that the commonly used guar gum fracturing fluid system will not only form a filter cake on the surface of the fracture, but also leave some residue in the formation and fractures, causing secondary damage
After the analysis of the fracturing fluid flowed back from the well to the surface after fracturing, it is concluded that during the fracturing operation, the fracturing residual fluid discharged only accounts for 30% of the guar gum fracturing fluid pumped into the well. %~50%, at the same time, it has the disadvantages of complex preparation process and high content of water insoluble

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The weight percent of each monomer and water is acrylamide: methacrylamide: undecylenic acid: AMPS: DMC: dodecafluoroheptyl methacrylate: vinylpyrrolidone: modified cornstarch: deionized water=5: 1:2.5:30:2.5:2.5:1:10:45.5. (1) Solution preparation Add 455g of deionized water into a 1000ml beaker, add 300g of AMPS monomer, 25g of undecylenic acid monomer, 25g of DMC monomer, stir and dissolve for 10 minutes, slowly add neutralizer ( sodium hydroxide) to pH6. Then add 50 g of acrylamide, 10 g of methacrylamide monomer, 5 g of dodecafluoroheptyl methacrylate monomer, 10 g of vinylpyrrolidone monomer, and 100 g of modified cornstarch, and stir to dissolve for 30 minutes.

[0027] (2) Adjustment of the solution Adjust the pH value to 6.0 and adjust the temperature to 14°C. (3) The solution was blown with nitrogen to deoxygenate for 30 minutes. Under the protection of nitrogen, 1 g of composite initiator azobisisobutyronitrile, 0.3 g of cerium ammonium nitrate, and 0.3 g o...

Embodiment 2

[0034] The weight percent of each monomer and water is acrylamide: methacrylamide: undecylenic acid: AMPS: DMC: dodecafluoroheptyl methacrylate: vinylpyrrolidone: modified cornstarch: deionized water=7: 1.5:1.5:35:2:2:3:8:40. (1) Solution preparation Add 400g of deionized water into a 1000ml beaker, add 350g of AMPS monomer, 15g of undecylenic acid monomer, 20g of DMC monomer, stir and dissolve for 10 minutes, and slowly add neutralizer ( sodium hydroxide) to pH6. Then add 70 g of acrylamide, 15 g of methacrylamide monomer, 20 g of dodecafluoroheptyl methacrylate monomer, 30 g of vinylpyrrolidone monomer, and 80 g of modified cornstarch, and stir to dissolve for 30 minutes.

[0035] (2) Adjustment of the solution Adjust the pH value to 6.5 and adjust the temperature to 15°C. (3) The solution was blown with nitrogen to deoxygenate for 30 minutes, and under the protection of nitrogen, 0.625 g of composite initiators azobisisobutyronitrile, 0.188 g of cerium ammonium nitrate, a...

Embodiment 3

[0042] The weight percent of each monomer and water is acrylamide: methacrylamide: undecylenic acid: AMPS: DMC: dodecafluoroheptyl methacrylate: vinylpyrrolidone: modified cornstarch: deionized water=10: 1:1:25:3:0.5:0.5:5:54. (1) Preparation of solution Add 540g of deionized water into a 1000ml beaker, add 250g of AMPS monomer, 10g of undecylenic acid monomer, 30g of DMC monomer, stir and dissolve for 10 minutes, and slowly add neutralizer ( sodium hydroxide) to pH7. Then add 100 g of acrylamide, 10 g of methacrylamide monomer, 5 g of dodecafluoroheptyl methacrylate monomer, 5 g of vinylpyrrolidone monomer, and 50 g of modified corn starch, and stir to dissolve for 30 minutes.

[0043] (2) Adjustment of the solution Adjust the pH value to 7 and adjust the temperature to 16°C. (3) The solution was blown with nitrogen to deoxygenate for 30 minutes, and under the protection of nitrogen, 1.875 g of composite initiators azobisisobutyronitrile, 0.56 g of cerium ammonium nitrate, ...

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Abstract

The invention belongs to the field of chemical engineering, and particularly relates to a water-based fracturing fluid thickening agent and a synthetic method thereof. The thickening agent comprises substances in parts by weight as follows: acrylamide, methacrylamide, undecylenic acid, 2-acrylamide-2-methylpropane sulfonate, methacryloyloxyethyl trimethyl ammonium chloride, dodecafluoroheptyl methacrylate, vinyl pyrrolidone, modified corn starch, an initiator and water. The synthetic method of the thickening agent comprises steps as follows: various co-monomers and modified starch are prepared in deionized water in proportion; the PH value and the temperature of the solution are adjusted; high-purity nitrogen is fed for oxygen removal; the compound initiator is added to initiate a reaction. The thickening agent is a multifunctional high-molecular polymer which is easily soluble, free of pollution and damage, good in sand carrying property and particularly good in temperature resistance and anti-shearing sand carrying property. The thickening agent has main characteristics of wide use temperature range as well as high temperature resistance and shearing resistance, has characteristics that the thickening agent is high in sand carrying property, free of residues, causes no damage to reservoir and the like, and can be used as an excellent substitute for guanidine gum.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a water-based fracturing fluid thickener and a synthesis method thereof. 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. At present, the thickeners used in water-based fracturing fluids are mainly natural plant gums and their de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C08F251/00C08F220/58C08F4/04C08F4/12
CPCC08F4/04C08F4/12C08F251/00C09K8/68C09K8/882C08F220/585
Inventor 赵亮曹军林高鸣池万绍鑫
Owner YANTAI RUNXING ENVIRONMENTAL PROTECTION TECH DEV