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Temperature-resistant and salt-resistant viscoelastic granular oil displacement agent and its preparation method and application

A temperature-resistant and salt-resistant, viscoelastic technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problem of insufficiency, temperature and salt resistance, poor gel strength and viscosity enhancement, and short expansion time. And other issues

Inactive Publication Date: 2021-03-16
山东聚星石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent application CN111635748A discloses a viscoelastic particle oil-displacing agent with water blocking function, and the cross-linking agent of the viscoelastic particle oil-displacing agent is diazo (N,N'-dimethylene isobutyramide) dihydrochloride , diazo(2-amidinopropane) dihydrochloride, which can easily lead to the introduction of organochlorine into the synthesized viscoelastic granular oil displacement agent, which does not meet the organic Chlorine content 0% requirement
Patent application CN101775275A discloses a novel viscoelastic particle oil-displacing agent and its preparation method. The raw material for the synthesis of the new viscoelastic particle oil-displacing agent is only acrylamide, and the synthesized new viscoelastic particle oil-displacing agent has no With the introduction of branched chains, the temperature and salt resistance, jelly strength, and viscosity-increasing effect are all poor, and the expansion time is short

Method used

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  • Temperature-resistant and salt-resistant viscoelastic granular oil displacement agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Add 100Kg of deionized water into the reaction kettle, then add 10Kg of acrylic acid (AA), and then add 1Kg of AMPS to the reaction system after it is completely dissolved, while keeping the temperature of the reaction system at 10°C, stir for 1 hour, and finally stir and mix well. Add 1.26Kg N,N-dimethylacrylamide (DMAM) to the above reaction system, after it is fully dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the DMAM in the reaction system. oxygen. Adjust the pH in the reaction kettle, and slowly add 0.006Kg [Bmim] to the reaction system under the protection of nitrogen 4 [SiMo 12 o 40 ] and 0.12Kg ethylene glycol initiated system aqueous solution prepolymerization. The reaction kettle was sealed, and the reaction time was 3h.

[0069] After the pre-polymerization reaction was completed, the pre-polymerization product was added into 1...

Embodiment 2

[0071] Add 100Kg of deionized water into the reaction kettle, then add 10Kg of acrylic acid (AA), and then add 5Kg of AMPS to the reaction system after it is completely dissolved, while keeping the temperature of the reaction system at 15°C, stir for 1 hour, and finally stir and mix well. Add 4.95Kg N,N-dimethylacrylamide (DMAM) to the above reaction system, after it is fully dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the DMAM in the reaction system. oxygen. Adjust the pH in the reaction kettle, and slowly add 0.045Kg [Hmim] to the reaction system under the protection of nitrogen 4 [SiMo 12 o 40 ] and 0.45Kg pentaerythritol initiated system aqueous solution prepolymerization. The reaction kettle was sealed, and the reaction time was 4h.

[0072] After the pre-polymerization reaction was completed, the pre-polymerization product was added to 50K...

Embodiment 3

[0074] Add 100Kg of deionized water into the reaction kettle, then add 20Kg of acrylic acid (AA), and then add 3Kg of AMPS to the reaction system after it is completely dissolved, while keeping the temperature of the reaction system at 12°C, stir for 1 hour, and finally stir and mix well. Add 3.11Kg of N,N-dimethylacrylamide (DMAM) to the above reaction system, after being dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the DMAM in the reaction system. oxygen. Adjust the pH in the reaction kettle, and slowly add 0.0217Kg [Hpy] to the reaction system under the protection of nitrogen 4 [GeMo 12 o 40 ] and 0.2893Kg glycerol initiation system aqueous solution prepolymerization. The reaction kettle was sealed, and the reaction time was 3.5h.

[0075] After the pre-polymerization reaction was completed, the pre-polymerization product was added to 32.5Kg A...

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Abstract

The invention provides a temperature-resistant and salt-resistant viscoelastic particle oil displacement agent and its preparation method and application, which belong to the technical fields of oil exploitation, transportation and chemical industry. The viscoelastic particle oil displacing agent provided by the present invention is formed by stepwise polymerization of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and acrylamide as monomer molecules, which can effectively control the polymerization reaction speed and make the end of the polymer network The branched chain is more stretched, so that the viscosity of the polymer is higher, and the performance of temperature resistance and salt resistance is better. Applying the viscoelastic particle oil displacement agent provided by the present invention to higher temperature and salinity, it has good elastic modulus of water dispersion system, median particle size after swelling, content of network structure and viscosity of water dispersion system, Excellent viscoelastic properties and migration properties can be realized. In addition, at a temperature of 90°C and a salinity of 32868 mg / L, it can still penetrate deep into reservoirs after polymer flooding, high-temperature and high-salt reservoirs, and severely heterogeneous reservoirs to play the role of plugging and profile control, expand the sweeping range, and improve recovery factor.

Description

technical field [0001] The invention belongs to the technical fields of petroleum exploitation, transportation and chemical industry, and relates to a temperature-resistant and salt-resistant viscoelastic particle oil displacement agent and a preparation method and application thereof. Background technique [0002] Most of the old oilfields in eastern my country have entered the middle and late stage of exploitation. After long-term development of secondary oil recovery and tertiary oil recovery, the recovery rate of crude oil has been greatly reduced. Mining efficiently. At present, the method of improving oil recovery after polymer flooding is difficult to meet the requirements of further greatly improving oil recovery. Therefore, it has become an urgent task to ensure the continuous supply of crude oil in my country to create a new oil displacement agent that can effectively extract a large amount of remaining oil from old oilfields. [0003] Patent application CN1116357...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/56C08F220/54C08F8/12C08F4/78C09K8/584
CPCC08F4/78C08F8/12C08F220/06C09K8/584C09K2208/30C08F220/585C08F220/54
Inventor 齐书磊李慎伟姜祖明杨姗陈海燕
Owner 山东聚星石油科技有限公司
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