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Hyperbranched polymer oil-displacing agent and preparation method thereof

A technology of hyperbranched polymer and oil displacing agent, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of complex process, high cost, harsh control of reaction conditions, etc., and achieve simple steps, mild conditions, The effect of good solubility and salt resistance

Active Publication Date: 2015-08-19
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN103130967 discloses the preparation of hyperbranched polymers by copolymerizing amine hyperbranched polymers with terminally modified ethylenic bonds as the core and acrylamide, sodium acrylate, hydrophobic monomer dimethyl allyl-N-alkyl ammonium chloride, etc. , but the use of dimethyl sulfoxide organic solvent in its preparation process, the process is more complicated
Patent CN102492092 discloses the use of reversible addition-fragmentation chain transfer (RAFT) inverse emulsion polymerization to prepare hyperbranched ionic amide polymers, the reaction conditions are controlled harshly, the cost is high, and cationic polymers are not suitable for use Used as oil displacing agent, used as flocculant

Method used

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  • Hyperbranched polymer oil-displacing agent and preparation method thereof
  • Hyperbranched polymer oil-displacing agent and preparation method thereof
  • Hyperbranched polymer oil-displacing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] 25mg mother nucleus HPG, 85mL H 2 O was placed in a three-necked flask, stirred and dissolved, and nitrogen gas was introduced to remove oxygen for 45 minutes, and then an aqueous solution of ammonium cerium nitrate (50 mg of ammonium cerium nitrate dissolved in 10 mL of water) was added under the protection of nitrogen, and the reaction was stirred at 40 ° C for 30 minutes. Slowly add acrylamide aqueous solution (8.0g acrylamide dissolved in 22mL water), sodium acrylate aqueous solution (2.0g sodium acrylate dissolved in 10mL water), acrylic betaine functional monomer aqueous solution (200mg acrylic betaine functional monomer dissolved in 3mL water) , and then heated up to 55 ° C for 6 hours, and the resulting reaction solution was placed in a 70 ° C oven to dry and remove water, to obtain 1# hyperbranched polymer oil displacement agent.

Embodiment 2

[0053] 30mg mother core HPG, 85mL H 2 O was placed in a three-necked flask, stirred and dissolved, and nitrogen gas was introduced to deoxygenate for 45 minutes, then an aqueous solution of ammonium cerium nitrate (60 mg of ammonium cerium nitrate dissolved in 10 mL of water) was added under the protection of nitrogen, and stirred for 30 minutes at 40 ° C. Slowly add acrylamide aqueous solution (8.0g acrylamide dissolved in 22mL water), sodium acrylate aqueous solution (2.0g sodium acrylate dissolved in 10mL water), acrylate bromide quaternary ammonium salt monomer aqueous solution (400mg acrylate bromide quaternary in 3mL of water), then heated up to 55°C for 6 hours, and the resulting reaction liquid was dried in an oven at 70°C to remove water, and 2# hyperbranched polymer oil displacement agent was obtained.

[0054] The polymer performance evaluation method provided by the present invention and the results are as follows, wherein the unmodified partially hydrolyzed polyac...

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Abstract

The invention provides a hyperbranched polymer oil-displacing agent and a preparation method thereof. The hyperbranched polymer oil-displacing agent is formed by a spherical parent nucleus and a polyacrylamide chain segment, a sodium polyacrylate chain segment and a poly amphoteric multi-claw dewatering functional chain segment which are connected in sequence, wherein, one end of the polyacrylamide chain segment is connected to the spherical parent nucleus, and the other end of the polyacrylamide chain segment is connected to the sodium polyacrylate chain segment. The poly amphoteric multi-claw dewatering functional chain segment is formed by polymerization of acrylic betaine monomer or acrylic bromine quaternary ammonium salt monomer. The viscosity average molecular weight of the hyperbranched polymer oil-displacing agent is 3.5 to 10 millions, and mass ratio of the spherical parent nucleus to the polyacrylamide chain segment to the sodium polyacrylate chain segment to the poly amphoteric multi-claw dewatering functional chain segment is 1:200-350:60-85:6-14 in sequence. The hyperbranched polymer oil-displacing agent is obtained by polymerization of a water phase radical solution, and a preparation process has mild conditions, simple steps, environment friendliness without pollutant and can obtain products of a series of molecular weights. The obtained hyperbranched polymer oil-displacing agent has higher anti-shear capability, higher tackifying capability, well solubility and anti-salt capability and has an oil gas field application prospect.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a hyperbranched polymer oil displacement agent and a preparation method thereof. Background technique [0002] Because water-soluble polyacrylamide can greatly increase the viscosity of the water phase and reduce the permeability of the water phase, thereby improving the water-oil mobility ratio, increasing the sweep coefficient, and achieving the purpose of reducing water and increasing oil, it has been widely used in polymer flooding, polymer flooding, etc. Among various enhanced oil recovery methods including surface binary compound, polyepibasic ASP flooding and profile control and water shutoff. [0003] However, with the application of polyacrylamide in oil recovery practice, its serious degradation problems in injection, wellbore, near-wellbore zone and formation migration have gradually been exposed. The main reasons for polymer degradation include mechanical ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/56C08F220/06C08F220/34C08F220/36C08F4/40C09K8/588
Inventor 陈文娟张健朱玥珺唐恩高檀国荣
Owner CHINA NAT OFFSHORE OIL CORP
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