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Oil displacement composition for enhanced oil recovery in high temperature, high salinity, medium and low permeability oil reservoir, and preparation method and application thereof

A high-temperature, high-salt, recovery factor technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as poor injectability

Active Publication Date: 2018-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] One of the technical problems to be solved by the present invention is that due to the poor injectivity of the hydrophobic association polymer in the near wellbore area in the prior art, it can only be used in medium and high permeability reservoirs, and the hydrophobic association polymer is easy to bond with the oil displacement surface. The problem of chromatographic separation caused by active agents provides a high-temperature, high-salt, medium-low permeability reservoir enhanced oil recovery composition, which can well improve the field injectability of hydrophobic association polymers for oil displacement, and greatly improve Composite Performance of Hydrophobic Association Polymer and Surfactant for Oil Displacement

Method used

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  • Oil displacement composition for enhanced oil recovery in high temperature, high salinity, medium and low permeability oil reservoir, and preparation method and application thereof
  • Oil displacement composition for enhanced oil recovery in high temperature, high salinity, medium and low permeability oil reservoir, and preparation method and application thereof
  • Oil displacement composition for enhanced oil recovery in high temperature, high salinity, medium and low permeability oil reservoir, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] First add 2500g of deionized water to the reaction kettle, add 430g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3.5g of sodium 2-acrylamidotetradecylsulfonate (NaAMC 14 S), 4.5g of acryloyloxyethyltrimethylammonium chloride (DAC), neutralized to neutral with NaOH, then added 0.04g of disodium edetate, 7g of urea, 0.07g of isopropanol, and stirred until completely dissolved. Adjust the pH value to 8.9 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 15°C, and then 10 g of 0.2% sodium bisulfite aqueous solution, 0.5% methacrylic acid N,N-di 10 g of methylaminoethyl ester (DMAEMA) aqueous solution, 10 g of 0.5% azobisisobutylamidine hydrochloride, 10 g of 0.3% potassium persulfate aqueous solution, continue to pass nitrogen gas for 30 minutes and then seal. After 1 hour, the reaction temperature was gradually raised to 52°C. After 3.5 hours of reaction, a gel-like polym...

Embodiment 2

[0069] (2) First add 2600g of deionized water to the reaction kettle, add 480g of acrylamide (AM), 130g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4.0g of 2-acrylamido dodecyl Sodium sulfonate (NaAMC 12 S), 7.8g methacryloyloxyethyltrimethylammonium chloride (DMC) and 5.0g nitrogen vinylpyrrolidone (NVP), neutralized to neutral with NaOH, then added disodium edetate 0.045 g, urea 7.0g, isopropanol 0.06g, stir until completely dissolved. Adjust the pH value to 9.0 with NaOH, and start feeding high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 16°C, and then 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl Aminoethyl ester (DA) aqueous solution 11g, 0.5% azobisisobutylamidine hydrochloride 11.9g, 0.3% potassium persulfate aqueous solution 11.2g, continue nitrogen gas for 30min and then seal. After 1 hour, the reaction temperature was gradually raised to 58° C., and after 3 hours of reaction, a gela...

Embodiment 3

[0072] First add 2700g of deionized water to the reaction kettle, add 500g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 5.2g of sodium 2-acrylamido hexadecylsulfonate (NaAMC 16 S) and 9.4g dimethyl diallyl ammonium chloride (DMDAAC), neutralized to neutral with NaOH, then add disodium edetate 0.05g, urea 8.0g, isopropanol 0.07g, stir until completely dissolved. Adjust the pH value to 9.5 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 20°C, and then 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl 12.1 g of aminoethyl ester (DA) aqueous solution, 12 g of 0.5% 2,2'-azo[2-(2-imidazolin-2-yl) propane] dihydrochloride, 11 g of 0.3% potassium persulfate aqueous solution, Continue to pass nitrogen gas for 30 minutes before sealing. After 1 hour, the reaction temperature was gradually raised to 55°C. After 2.5 hours of reaction, a gel-like polymer ...

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Abstract

The invention relates to an oil displacing system for increasing oil recovery in high temperature high salt mid-low permeability oil reservoir, and a preparation method thereof, and aims to solve the problems that in the prior art, hydrophobic associated polymer can easily obstruct the holes of sandstone formation, the injection performance of oil displacing agent is bad in the immediate vicinity of wellbore, the oil displacing agent can only applied to mid-high permeability oil reservoirs, and the hydrophobic associated polymer can easily react with oil displacing surfactant to generate chromatographic separation. The oil displacing agent comprises the following components in parts by weight: 0.01 to 1 part of adsorption resisting agent, 0.05 to 3 parts of hydrophobic associated polymer, 0.2 to 5 parts of oil displacing surfactant, and 91 to 99.8 parts of water; wherein the adsorption resisting agent is one or more of nonionic surfactant and anionic surfactant. The provided oil displacing agent well solves the problems mentioned above, and can be applied to the onsite oil displacing in a mid-low permeability oil reservoir.

Description

technical field [0001] The invention relates to a high-temperature, high-salt, medium-low permeability reservoir oil displacement composition for enhancing recovery, a preparation method and application thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. The oil displacement mechanism of the polymer is mainly to use the viscosity of the water-soluble polyacrylamide molecular chain to improve the mobility ratio of the displacement fluid, increase the displacement efficiency and the swept volume, so as to achieve the purpose of enhancing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/588C08F220/56C08F220/58C08F220/34C08F220/06C08F4/40
Inventor 夏燕敏蔡红苏智青许汇沙鸥张国萍于志省朱益兴
Owner CHINA PETROLEUM & CHEM CORP
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