Oil displacement composition constructed by anionic amphiphilic polymer and its preparation method and application

An amphiphilic polymer, anionic technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as economic effectiveness still needs to be improved, achieve excellent mobility control ability, avoid formation clogging problems, Effects with low long-term damage

Active Publication Date: 2020-10-13
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing composite systems still do not fully meet the technical requirements for maintaining high-efficiency fluidity control capabilities at low polymer concentrations, and the economic effectiveness still needs to be improved

Method used

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  • Oil displacement composition constructed by anionic amphiphilic polymer and its preparation method and application
  • Oil displacement composition constructed by anionic amphiphilic polymer and its preparation method and application
  • Oil displacement composition constructed by anionic amphiphilic polymer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] This example provides oil displacement compositions prepared from different anionic amphiphilic polymers, and the anionic amphiphilic polymer has the following structure:

[0037]

[0038] As shown in the above structure, its hydrophobic group is n-hexadecyl, the content of hydrophobic monomer is 1.0%, the degree of hydrolysis is 25%, and the relative molecular mass is 328×10 4 , x:y:z=74:1:25.

[0039] The preparation method of this anionic amphiphilic polymer is:

[0040] First, dissolve acrylamide, hexadecyl acrylamide, and sodium acrylate in the sodium lauryl sulfate micellar solution according to the above ratio, and place it in a three-neck round bottom flask with a monomer mass concentration of 20%. The flask is equipped with a rubber diaphragm with a mechanical stirrer. Continue to feed nitrogen into the flask for 2 hours to make the flask anaerobic, then slowly add potassium persulfate-sodium bisulfite initiator system, the initiator concentration is 0.2% ...

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Abstract

The invention provides an oil displacing composition formed by an anionic amphiphilic polymer and a preparation method and applications thereof. The oil displacing composition comprises an anionic amphiphilic polymer and medium-chain fatty alcohols according to a ratio of (0.05-0.3): (0.02-0.1). The oil displacing composition is applied to oil extraction. When the concentration of the amphiphilicpolymer is low (0.05-0.30%), the solution viscosity is largely increased; the temperature resistant property and the salt resistant property become better, the shearing recovering performance is enhanced; the composition has higher effective viscosity in a porous medium and an excellent mobility control performance during the oil displacing process, and the sweep efficiency of the oil displacing composition is effectively improved. The obstruction of stratums caused by long term injection of high concentration polymers is avoided. The long term damage to stratums is reduced. The economic costand environment cost of a polymer oil displacing agent are prominently reduced. The application prospect of the oil displacing composition is wide.

Description

technical field [0001] The invention belongs to the field of oil recovery technology, and in particular relates to an oil displacement composition constructed by an anionic amphiphilic polymer, a preparation method and an application. Background technique [0002] Polymers have been widely used in tertiary oil recovery by reducing water-oil mobility ratio and improving sweep efficiency. The most commonly used polymer for oil displacement is partially hydrolyzed polyacrylamide (HPAM). In recent years, the concentration and molecular weight of the HPAM solution injected into the formation have been continuously increased to meet the requirements of polymer flooding mobility control. However, the increase in the amount of polymer and the poor temperature and salt tolerance of HPAM make it less economical. In addition, high concentrations increase the possibility of polymer retention in the formation, which is likely to cause long-term formation damage. Therefore, in oil fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/54C08F220/06C09K8/588
CPCC08F220/56C09K8/588C08F220/54C08F220/06
Inventor 侯吉瑞路遥孟子昱李哲徐德荣刘同敬吴海荣康万利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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