Acrylamide series terpolymer, preparation method, and applications thereof

An acrylamide-based terpolymer, polymerization reaction technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of inability to meet the requirements of drag-reducing water fracturing, poor compatibility, long dissolution time, etc. , to achieve the effect of improving inhibition and anti-filtration performance, carrying sand at high pumping displacement, and reducing water-sensitive effect

Active Publication Date: 2014-02-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the use of guar gum, cellulose and their derivatives as drag reducing agents in drag reducing water fracturing has improved the pumping displacement and reduced the frictional resistance in the pipeline to a certain extent (US5697444, US5271466), but still cannot It meets the requirements of drag-reducing water fracturing, mainly due to the following disadvantages of the above-mentioned biopolymers: ①Limited drag-reducing performance, which is obviously inferior to acrylamide polymers; ②Since guar gum, cellulose and their derivatives have a small amount of insoluble Easy to cause damage to the ground
③The dissolution time is longer
[0006] In the drag reducing water fracturing construction, acrylamide polymers (basically partially hydrolyzed acrylamide or anionic acrylamide copolymer) are used as the drag reducing agent in the drag reducing water fracturing fluid, which greatly improves the The pumping displacement reduces the frictional resistance in the pipeline, but when used as a drag reducing agent for shale gas reservoir drag reducing water fracturing fluid, there are the following important defects: ① In order to reduce the "water sensitive effect" in the fracturing process, Inhibit the hydration expansion of clay components in shale, help the flowback of drag-reducing water fracturing fluid, and reduce "water plugging". Part of alcohol must be added to the fracturing fluid
Partially hydrolyzed acrylamide or anionic acrylamide copolymer and its emulsion products have poor compatibility with alcohol and are prone to precipitation
② When partially hydrolyzed acrylamide or anionic acrylamide copolymer is used as a drag reducing agent for shale gas reservoir drag reducing water fracturing fluid, the anti-filtration performance is poor, and this kind of drag reducing water fracturing fluid is very easy to filter out. In the formation
③The temperature resistance and salt resistance are poor, especially under the condition of high salinity (high divalent ion content), the molecular structure is unstable, and the drag reduction effect drops rapidly
The drag-reducing water fracturing fluid has excellent drag-reducing performance, the indoor average drag-reduction rate reaches 65.0%, and the salt resistance (especially the tolerance to divalent calcium ions) has been improved to a certain extent, but this drag-reducing The water fracturing system used as shale gas drag-reducing water fracturing fluid has the following problems: ①The compatibility with alcohol is poor, and it is easy to produce precipitation when it interacts with methanol and other alcohols
②The anti-filtration performance is poor, and this kind of drag-reducing water fracturing fluid is very easy to leak into the formation
④It is very easy to produce "water blockage"
⑤Poor high-speed shear resistance, under high-speed shear, the drag reduction rate drops rapidly; Unstable, the drag reduction effect drops rapidly

Method used

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  • Acrylamide series terpolymer, preparation method, and applications thereof
  • Acrylamide series terpolymer, preparation method, and applications thereof
  • Acrylamide series terpolymer, preparation method, and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Formula (21)

[0057] At room temperature, add 38.1g of acrylamide (AM), 28.2g of the monomer represented by formula (21) and 6.6g of methyl acrylate into the reaction flask, add 170.1g of deionized water, stir to completely dissolve the monomer, and Disperse evenly. Add 5.5 g of 1% by weight of EDTA aqueous solution, 2.1 g of 1% by weight of azobisisobutylamidine hydrochloride aqueous solution, 0.166 g of chain extender N,N'-dimethylethylenediamine, and 0.11 g of urea into the flask respectively. g, stir well to make it evenly mixed. The pH of the system was adjusted to 7.5 with 1% by weight sodium hydroxide solution. The initial temperature of the system was controlled to 4°C, and after 30 minutes of nitrogen deoxygenation, 1.1 g of 1% by weight ammonium persulfate aqueous solution was added, and nitrogen deoxygenation was continued for 20 minutes. Close the reactor and keep it at 4°C. After reacting for 10 hours, raise the temperature to 20°C and react for 5 hou...

Embodiment 2

[0065] Formula (23)

[0066] At room temperature, add 38.1g of AM, 63.2g of the monomer represented by formula (23) and 21.6g of hydroxypropyl methacrylate into the reaction flask, add 355.5g of deionized water, stir to completely dissolve the monomer, and add Add 4.65 g of 1 mass % EDTA aqueous solution to the flask, add 1.23 g of 1 wt % azobisisobutylamidine hydrochloride aqueous solution, add chain extender N, N'-dimethylethylenediamine 0.12 g, add 0.1 % sodium bisulfite solution 1.13g, add urea 0.11g, stir well to make it evenly mixed. The initial temperature of the system was controlled to 4°C, and after 30 minutes of nitrogen deoxygenation, 1.0 g of 1% by weight ammonium persulfate aqueous solution was added and nitrogen deoxygenation was continued for 10 minutes. Seal the reactor and keep it at 2°C. After reacting for 8 hours, raise the temperature to 25°C. After reacting for 6 hours, raise the temperature to 50°C and react for 12 hours. Take out the obtained colloid...

Embodiment 3

[0070] Formula (25)

[0071] At room temperature, put 35.6g of methacrylamide, 84.8g of the monomer represented by formula (25) and 28.8g of 4-hydroxybutyl acrylate into the reaction flask, add 595g of deionized water, stir to completely dissolve the monomer, and add Add 7.56g of 1% by weight of EDTA aqueous solution to the flask, add 2.13g of 1% by weight of azobisisobutylamidine hydrochloride aqueous solution, add 0.01g of chain extender N,N'-dimethylethylenediamine, add 0.1 Add 0.20 g of urea to 2.13 g of the weight % sodium bisulfite solution, stir well to make it evenly mixed. The initial temperature of the system was controlled to 2°C, and after 30 minutes of nitrogen deoxygenation, 3.0 g of 1% ammonium persulfate aqueous solution was added and nitrogen deoxygenation was continued for 10 minutes. Seal the reactor and keep it at 2°C. After reacting for 8 hours, raise the temperature to 30°C. After reacting for 5 hours, raise the temperature to 50°C and react for 4 hour...

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Abstract

The invention relates to an acrylamide series terpolymer, a preparation method, and applications thereof. The acrylamide series terpolymer comprises a structural unit A, a structural unit B, and a structural unit C, wherein the structural unit A comprises a structural unit represented by the formula (1), the structural unit B comprises a structural unit represented by the formula (2), and the structural unit C comprises a structural unit represented by the formula (3). The acrylamide series terpolymer improves the solubility of the terpolymer in alcohol and clay inhibitor, has high drag reduction efficiency under a high salinity condition when the terpolymer is used as a drag reducer, and has a very good drag reducing effect in a pH range from 4 to 10.

Description

technical field [0001] The invention relates to an acrylamide terpolymer, a preparation method thereof, and the application of the acrylamide terpolymer as a drag reducer. Background technique [0002] As a typical representative of the utilization of unconventional oil and gas resources - the exploitation of shale gas (oil) resources has become a revolution in the field of unconventional oil and gas resources in the world. Key technologies. Due to the extremely tight oil and gas reservoirs such as shale gas reservoirs have the characteristics of extremely low permeability (generally less than 0.5mD), high fracturing pressure, and easy formation damage. It must be exploited by "reducing water (slick water) fracturing" technology. [0003] "Drag reducing water (slick water) fracturing" is a type of hydraulic fracturing. Compared with the current conventional fracturing system (modified guar gum crosslinking system), drag reducing water (slick water) fracturing does not rely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/06C08F220/04C08F220/14C08F220/28C08F4/40C08F4/04C09K8/68
Inventor 杜凯赵方园
Owner CHINA PETROLEUM & CHEM CORP
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