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Non-ionic hyperbranched hydrophobic association polyacrylamide thickening agent and preparation method thereof

A technology of polyacrylamide and hydrophobic association, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of using many types of raw materials and complex synthesis methods, and achieve good viscoelasticity, high viscosity, and enhanced stability sexual effect

Pending Publication Date: 2022-07-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above patent applications, metal ions are used as cross-linking agents, or diallyl acrylamides are used as cross-linking units to synthesize zwitterionic polymers. The synthesis method is relatively complicated and there are many types of raw materials used.

Method used

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  • Non-ionic hyperbranched hydrophobic association polyacrylamide thickening agent and preparation method thereof
  • Non-ionic hyperbranched hydrophobic association polyacrylamide thickening agent and preparation method thereof
  • Non-ionic hyperbranched hydrophobic association polyacrylamide thickening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In this example, a non-ionic hyperbranched hydrophobically associating polyacrylamide thickener D1 was synthesized, and its properties were measured.

[0060] Synthesis of methacrylate poly(ethylene glycol) 360 adamantyl methyl ester:

[0061] Under ice-water bath conditions, take 3.6 g of polyethylene glycol methacrylate (Mw=360, CAS number: 25736-86-1) and 2 g of 1-adamantanecarbonyl chloride, add them into 50 mL of dichloromethane, and after stirring evenly, A dichloromethane solution containing 1.05 g of triethylamine was slowly added dropwise, and after stirring for 4 h, the precipitate was removed by filtration, washed twice with 20 mL of 1% sodium bicarbonate solution and 1% hydrochloric acid in turn, and then separated. The obtained oily liquid is the product poly(ethylene glycol) 360 adamantane methyl methacrylate.

[0062] The preparation method of thickener D1 comprises: taking 21.3 g (0.3 mol) of acrylamide, 0.766 g (0.0015 mol) of poly(ethylene glycol) met...

Embodiment 2

[0070] In this example, a non-ionic hyperbranched hydrophobically associating polyacrylamide thickener D2 was synthesized, and its properties were measured.

[0071] Synthesis of acrylate polyethylene glycol 360 adamantane ethyl ester:

[0072] Take 3.6 g of acrylic acid poly(ethylene glycol) (Mw=360) and 2 g of 1-adamantaneacetic acid, add them to 50 mL of tetrahydrofuran, and after stirring evenly, slowly add a dichloromethane solution containing 1.5 g of thionyl chloride dropwise, at 60°C After refluxing for 4 hours, the solvent was evaporated to dryness, then ethyl acetate was added to dissolve it, washed twice with sodium bicarbonate ice-water mixture, and then the liquid was separated. Diol 360 Adamantane ethyl ester.

[0073] The preparation method of thickener D2 includes:

[0074] Take acrylamide 21.3g (0.3mol), methacrylate poly(ethylene glycol) 360 adamantyl methyl ester 0.766g (0.0015mol), polyethylene glycol diacrylate (Mw=200) 0.06g (0.003mol) , the molar rati...

Embodiment 3

[0076] In this example, a non-ionic hyperbranched hydrophobically associating polyacrylamide thickener D3 was synthesized and its properties were measured.

[0077] Synthesis of methacrylate polyethylene glycol 950 adamantane ethyl ester:

[0078] Take 9.5 g of polyethylene glycol methacrylate (Mw=950) and 2 g of 1-adamantane acetic acid, add them to 50 mL of dichloromethane, and after stirring evenly, add 2.1 g of N,N-dicyclohexylcarbodiimide, After stirring for 6 hours, filter, evaporate the solvent to dryness, add ethyl acetate to dissolve, wash twice with sodium bicarbonate ice-water mixture, and carry out liquid separation. Ester polyethylene glycol 950 adamantane ethyl ester.

[0079] Thickener D3 was prepared the same as thickener D2.

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Abstract

The invention discloses a nonionic hyperbranched hydrophobic association polyacrylamide thickening agent and a preparation method thereof. Synthetic raw materials of the thickening agent comprise a monomer and an initiator; the monomers comprise the following components in percentage by mole: 90 to 99.9 percent of acrylamide, 0.1 to 10 percent of acrylic acid poly (ethylene glycol) adamantane esters and 0.01 to 0.1 percent of polyethylene glycol diacrylate, wherein the total molar weight of all the monomers is 100 percent; the use amount of the initiator is 0.05-0.5% of the total mass of the monomer. The synthesis raw materials of the thickening agent are all water-soluble monomers, the synthesized thickening agent also has good water solubility and high dissolution speed, and the polymer molecules present a cross-linked structure, so that the solution of the polymer molecules has high viscosity, and the polymer molecules have good application prospects in the aspects of acid fracturing and oil displacement of oil and gas fields.

Description

technical field [0001] The invention relates to the technical field of oil and gas field fracturing, in particular to a non-ionic hyperbranched hydrophobically associated polyacrylamide thickener containing an adamantane structure for acid fracturing in oil and gas fields and a preparation method thereof. Background technique [0002] With the exhaustion of conventional oil and gas resources, the unconventional oil and gas resources, which are more difficult to exploit, have attracted people's attention. Compared with conventional oil and gas resources, unconventional oil and gas reservoirs have the characteristics of low porosity, low permeability and strong heterogeneity. The current production stimulation measures are mainly pumping fracturing fluid with a certain viscosity into the unconventional reservoir to fracturing the reservoir, forming a large-scale complex fracture network in the reservoir, increasing the oil and gas seepage area, and achieving the purpose of sti...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/28C08F222/20C09K8/588C09K8/68C09K8/88
CPCC08F220/56C09K8/588C09K8/68C09K8/882C08F220/286C08F222/102
Inventor 敬显武熊颖龙顺敏
Owner PETROCHINA CO LTD
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