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Modified acrylamide polymer fracturing fluid

An acrylamide and polymer technology, applied in the field of modified acrylamide polymer fracturing fluids, can solve the problems of poor salt resistance, high viscosity, and large limitations, and achieve low damage, moderate crosslinking time, and wide Applicable Effects

Inactive Publication Date: 2014-11-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of polymer fracturing fluid cross-linking environment limitation, high viscosity, and poor salt resistance in the prior art, and introduce vinyl monomer and unsaturated sulfonic acid to the polymer thickener salt groups, and optimize a series of supporting crosslinking agent systems

Method used

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  • Modified acrylamide polymer fracturing fluid
  • Modified acrylamide polymer fracturing fluid
  • Modified acrylamide polymer fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0022] Add 250 parts of deionized water in parts by mass into a reactor with a stirrer and a thermometer, start stirring and add 10 parts of 2-acrylamido-2-methylpropyl sodium sulfonate, 40 parts of acrylamide, 6 parts Acrylic acid and 4 parts of vinylpyrrolidone were stirred until completely dissolved, and the pH value of the reaction solution was adjusted to 6.5 with 30% aqueous sodium hydroxide solution, heated to 45°C, and nitrogen gas was passed for 20 to 40 minutes until the oxygen was completely removed, and then rapidly to Add 0.2 part of ammonium persulfate, 0.1 part of sodium bisulfite and 0.1 part of azobisisobutylimidazoline hydrochloride initiator into the reaction system, stop stirring after stirring evenly, keep the temperature for 6 hours, and after the reaction finishes, Cut into granules, dry and pulverize to obtain the modified acrylamide polymer thickener A, whose molecular formula is:

[0023]

[0024] Among them, x is 66.67%, y is 16.67%, m is 10%, and...

preparation example 2

[0026] Add 300 parts of deionized water in parts by mass into a reactor with a stirrer and a thermometer, start stirring and add 12 parts of 2-acrylamido-2-methylpropyl sodium sulfonate, 50 parts of acrylamide, 8 parts α-methacrylic acid, 5 parts of vinylpyrrolidone, stir until completely dissolved, adjust the pH value of the reaction solution to 6 with a 20% aqueous sodium hydroxide solution by mass fraction, raise the temperature to 40°C, and pass nitrogen gas for 20 to 40 minutes until the oxygen is removed As much as possible, quickly add 0.2 parts of potassium persulfate, 0.1 parts of sodium bisulfite and 0.1 parts of azobisisobutylimidyl hydrochloride initiator to the reaction system, stir evenly, stop stirring, keep warm for 8 hours, and after the reaction , after shearing granulation, drying and crushing, the modified acrylamide polymer thickener B is obtained, and its molecular formula is:

[0027]

[0028] Among them, x is 66.67%, y is 16%, m is 10.67%, and n is 6...

Embodiment 1

[0030] First, add 2.25g of modified acrylamide polymer thickener A into a Wuyin mixer filled with 500mL of water, stir until uniform, swell for several hours and set aside. Take out 88.5g of the above-mentioned modified acrylamide polymer thickener and pour it into a 200mL beaker, and add 0.3mL of potassium perfluorononanoate, 1227 and sodium dodecylsulfonate in a ratio of 0.1:1:5 and mix it in turn. Surfactant and 0.5mL glycidyltrimethylammonium chloride clay stabilizer, adjust the pH value of the base solution to 6.5 with acetic acid. Finally, add 0.35 mL of a cross-linking agent mixed with triethanolamine zirconium lactate and tetrabutoxy zirconate in a ratio of 3:1 to the base liquid, and stir with a glass rod to obtain a modified acrylamide Polymer fracturing fluid.

[0031] The crosslinking time of this polymer fracturing fluid is 120s. The viscosity of the fracturing fluid was 251.4 mPa·s after shearing at 120 °C for 90 min using an RS6000 rheometer, and remained at 1...

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Abstract

Belonging to the technical field of oilfield chemistry, the invention relates to a modified acrylamide polymer fracturing fluid. The modified acrylamide polymer fracturing fluid is composed of the following components by mass: 0.4-0.6% of a modified acrylamide polymer thickening agent; 0.2-0.5% of a cross-linking agent; 0.1-0.5% of a surfactant; 0.3-1.0% of a clay stabilizer; and the balance water. According to the invention, on the basis of existing fracturing fluid, a vinyl monomer able to inhibit amide group hydrolysis and a salt tolerant and hydrophilic sulfonate group are introduced to the polymer thickening agent, thus greatly enhancing the heat resistance and salt tolerance of the fracturing fluid. A preferable matching crosslinking agent series is selected to reduce the sensitivity of the pH value to crosslinking, and the formed polymer fracturing fluid system has good hot shearing performance and salt resistance. The pH value range of fracturing fluid crosslinking can be widened, and the crosslinking time is moderate. The modified acrylamide polymer fracturing fluid can be widely applicable to fracturing transformation measures of hypotonic reservoirs.

Description

technical field [0001] The invention relates to a modified acrylamide polymer fracturing fluid, which belongs to the technical field of oilfield chemistry and is widely used in fracturing fluid systems for fracturing reconstruction of low-permeability reservoirs. Background technique [0002] There are two kinds of existing polymer fracturing fluids: one is acidic fracturing fluid and the other is neutral fracturing fluid. The thickener includes polyacrylamide, sodium polyacrylate, polyacrylate, polyvinylamine and other synthetic polymers, and the crosslinking agent is amphoteric metal salts such as aluminum and zirconium. The current problems of existing polymer fracturing fluids are: the cross-linking of fracturing fluids is highly sensitive to pH value, the range of pH values ​​that can be cross-linked is small, and the cross-linking time is affected by both pH value and cross-linking groups It is not easy to control; the viscosity of the polymer fracturing fluid base fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08F220/56C08F220/06C08F226/10C08F220/58C08K5/56C08K5/098C08K5/10
CPCC08F220/56C09K8/602C09K8/608C09K8/665C09K8/685C09K8/882C09K8/887C09K2208/12C09K2208/26C08F220/585C08F220/06C08F226/10
Inventor 苏君慧谢艳新王栋王安培郎学军王稳桃张文豪张梅静
Owner CHINA PETROLEUM & CHEM CORP
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