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Betaine type amphiphilic polymer supramolecular oil displacement system and construction method thereof

A technology of amphiphilic polymer and betaine, which is applied in the direction of drilling compositions, chemical instruments and methods, and production fluids, etc. It can solve the problem of reduced viscosity increasing ability, reduced viscosity, and reduced ability to control water-oil mobility ratio, etc. problem, achieve the effect of reducing water-oil mobility ratio, increasing swept volume, and simple preparation method

Active Publication Date: 2018-06-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Partially hydrolyzed polyacrylamide (HPAM) is currently one of the most widely used water-soluble polymers in oil field flooding. However, under harsh reservoir conditions, there are still some limitations in the use of HPAM, especially in high-reservoir conditions. Under high temperature conditions, due to the electrostatic shielding effect of salt, the viscosity of HPAM solution will be greatly reduced, making the viscosifying effect worse, and the ability to control the water-oil mobility ratio will be greatly reduced, which seriously affects the effect of polymer flooding. Technical bottlenecks restricting the popularization and application of polymer flooding technology in high-salt reservoirs
In view of the problems existing in the application process of the existing polymer oil displacement agent HPAM, researchers have developed other types of salt-soluble polymers, such as: amphoteric polymers, with special structures (such as star, shuttle, block , cross-network, etc.) polymers, amphiphilic polymers, etc., but these polymers also have some problems: amphoteric polymers have a large amount of formation adsorption loss, and polymers with special structures have severe mechanical shear degradation 1. Conventional amphiphilic polymers are all ionic polymers. Under the conditions of high salinity, especially the presence of high-valent ions, the viscosity of ordinary amphiphilic polymers will decrease, and the viscosity-increasing ability will decrease, etc.
However, in the process of formation migration, the polymer is diluted by formation fluid and adsorbed by rock minerals, and its relative concentration will inevitably decrease, which greatly reduces the viscosity-increasing ability and oil displacement efficiency of amphiphilic polymers.

Method used

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  • Betaine type amphiphilic polymer supramolecular oil displacement system and construction method thereof
  • Betaine type amphiphilic polymer supramolecular oil displacement system and construction method thereof
  • Betaine type amphiphilic polymer supramolecular oil displacement system and construction method thereof

Examples

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Embodiment 1

[0041] This implementation example provides a betaine type amphiphilic polymer supramolecular oil displacement system, prepare mineralized water with a salinity of 19000.7 mg / L (see Table 1 for the ion composition of the mineralized water), stir for 1 hour, and mix well , to ensure complete dissolution; add 0.25wt% betaine-type amphiphilic polymer (formula I, betaine monomer N,N-dimethyl-N-methacrylamidopropyl- The molar ratio of N-propanesulfonic acid inner salt is 20%, the molar ratio of hydrophobic monomer N,N-dimethylhexadecyl allyl ammonium chloride is 1.5%, and the relative molecular weight of the polymer is about 650×10 4 . ), stirred for 4 hours to ensure that the polymer was fully dissolved and mixed uniformly, and the solution was left to mature for 24 hours in a 45°C incubator; 0.07wt% citric acid was added to the prepared polymer solution and stirred for 2 hours to ensure that the lemon The acid is fully dissolved and mixed evenly, and the pH value of the solution...

Embodiment 2

[0049] This implementation example provides a betaine type amphiphilic polymer supramolecular oil displacement system, prepare 4500mg / L NaCl solution as mineralized water, stir for 0.5 hour, mix well, ensure complete dissolution; Add 0.20wt% betaine-type amphiphilic polymer (formula II, betaine monomer N, N-dimethyl-N-methacrylamidopropyl-N-propanesulfonic acid inner salt (DMMPPS) molar ratio 20%, the molar ratio of hydrophobic monomer N,N-dimethyldodecyl to vinyl benzyl ammonium chloride is 1.5%, and the relative molecular weight of the polymer is about 810×10 4 ), stirred for 6 hours to ensure that the polymer was fully dissolved and mixed evenly, and the solution was left to mature for 24 hours in a thermostat at 45°C; 0.05wt% disodium edetate was added to the prepared polymer solution, and stirred 2 hours, ensure full dissolution and uniform mixing, adjust the pH value of the solution to 8.5, its viscosity is 171.5mPa·s at 85°C, the viscometer speed is 6rpm, and the polyme...

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Abstract

The invention provides a betaine type amphiphilic polymer supramolecular oil displacement system which is prepared from the following components in mass percent: 0.05-1.50% of betaine type amphiphilicpolymer, 0.01-0.15% of organic polyprotic acid and 99.94-98.40% of mineralized water. The betaine type amphiphilic polymer supramolecular oil displacement system can effectively improve the viscosityof the amphiphilic polymer oil displacement system, reduce the dosage of the polymer, effectively reduce the water-oil mobility ratio as well as increase the swept volume and the oil displacement efficiency of the polymer under the conditions of high temperature, high salt content and oil deposition, and has good application prospects and economic values in the field of tertiary oil recovery of an oil field. The system provided by the invention is simple in construction step, convenient in operation and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a betaine-type amphiphilic polymer supramolecular oil flooding system and a construction method thereof. Background technique [0002] During polymer flooding, high-viscosity water-soluble polymers are injected into reservoir formations to achieve enhanced oil recovery by reducing the water-oil mobility ratio. With the continuous popularization and application of polymer flooding technology in oil fields, the reservoir conditions for polymer flooding are getting worse and worse, and polymers have to face the impact of high salinity on polymer viscosity. Partially hydrolyzed polyacrylamide (HPAM) is currently one of the most widely used water-soluble polymers in oil field flooding. However, under harsh reservoir conditions, there are still some limitations in the use of HPAM, especially in high-reservoir conditions. Under high temperature conditions, due...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/88E21B43/22
CPCC09K8/588C09K8/882E21B43/16
Inventor 杨红斌康万利张向峰朱洲陈超王鹏祥邵硕侯小雨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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