Salt-tolerant nano-film oil displacement agent for oil field

A technology of nano-membrane and oil-displacing agent, which is applied in the field of oil-displacement. It can solve the problems of nano-membrane oil-displacing agent not being resistant to salt, changing the adsorption properties of reservoirs, and poor effect, and achieving strong resistance to mineral salts and low interfacial tension. , good water solubility

Pending Publication Date: 2021-12-14
山东滨州昱诚化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, after the nano-film agent is injected into the formation, the electrostatic interaction between ions is deposited on the surface of the reservoir and reaches a saturated state to form a monomolecular film, thereby changing the adsorption properties of the reservoir. The surface is taken out of the formation, so as to achieve the purpose of improving the efficiency of water washing oil and oil recovery, and achieve the effect of oil displacement. However, the existing nano-film oil displacement agent is not resistant to salt, and the effect is poor in the oil layer with high salinity

Method used

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Embodiment 1

[0016] The salt-tolerant nano-membrane oil displacement agent for oil field of the present invention comprises nano-molecular deposition film agent, dimer sodium sulfonate gemini surfactant, the quality of nano-molecular deposition film agent and dimer sodium sulfonate gemini surfactant The ratio is 20:1.

[0017] The nano-molecular deposition film agent is prepared by the following method: take epichlorohydrin and ethylenediamine as raw materials, and carry out polymerization reaction under the action of initiator potassium sulfate, and the molar ratio of epichlorohydrin to ethylenediamine is 2:1 , the polymerization reaction temperature was 70°C, and the reaction time was 2h.

[0018] The salt-tolerant nano-membrane oil displacement agent for oil fields of the present invention is prepared by the following method: put the nano-molecular deposition film agent and the dimer sodium sulfonate gemini surfactant into the reaction kettle, heat up to 40°C and stir, and mix evenly H...

Embodiment 2

[0020] The salt-tolerant nano-membrane oil displacement agent for oil field of the present invention comprises nano-molecular deposition film agent, dimer sodium sulfonate gemini surfactant, the quality of nano-molecular deposition film agent and dimer sodium sulfonate gemini surfactant The ratio is 10:1.

[0021] The nanometer molecular deposition film agent is made by the following method: take epichlorohydrin and ethylenediamine as raw materials, and carry out polymerization reaction gained under the action of initiator sodium persulfate, and the mol ratio of epichlorohydrin and ethylenediamine is 1: 1. The polymerization reaction temperature is 60°C, and the reaction time is 3 hours.

[0022] The salt-tolerant nano-membrane oil displacement agent for oil fields of the present invention is prepared by the following method: put the nano-molecular deposition film agent and the dimer sodium sulfonate gemini surfactant into the reaction kettle, heat up to 40°C and stir, and mix...

Embodiment 3

[0024] Salt-tolerant nano-film oil displacement agent for oilfields of the present invention comprises nano-molecular deposition film agent, dimer sodium carboxylate gemini surfactant, the quality of nano-molecular deposition film agent and dimer sodium carboxylate gemini surfactant The ratio is 20:1.

[0025] The nano-molecular deposition film agent is prepared by the following method: using epichlorohydrin and dibutylamine as raw materials, it is obtained by polymerization reaction under the action of initiator sodium sulfate, and the molar ratio of epichlorohydrin to ethylenediamine is 3:1 , the polymerization reaction temperature was 80° C., and the reaction time was 1 h.

[0026] The salt-tolerant nano-membrane oil displacement agent for oil fields of the present invention is prepared by the following method: put the nano-molecular deposition film agent and the dimer sodium carboxylate gemini surfactant into the reaction kettle, heat up to 40°C and stir, and mix evenly H...

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Abstract

The invention relates to the technical field of oil displacement of oil fields, in particular to a salt-tolerant nano-film oil displacement agent for oil fields. The oil displacement agent is formed by compounding a nano-molecular deposition film agent and an anionic gemini surfactant, and the anionic gemini surfactant has two hydrophilic ends, is better in water solubility and strong in mineral salt resistance, and has relatively low interfacial tension under the condition of a relatively small concentration. Meanwhile, the cationic nano-molecular deposition film agent is adsorbed on the surface of a bottom layer by utilizing the electrostatic attraction between the prepared cationic nano-molecular deposition film agent and the stratum, so that the adsorption property of a reservoir is changed to expel adsorbed crude oil, the salt resistance of the nano-deposition film is improved through the synergistic cooperation of the cationic nano-molecular deposition film agent and the stratum, and the oil displacement agent is suitable for oil displacement of high-salinity oil reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil flooding, in particular to a salt-tolerant nano-film oil flooding agent for oil fields. Background technique [0002] Tertiary oil recovery refers to the method in which other injection agents, such as media, chemical agents or fluids, are used to recover the remaining oil in the reservoir after primary oil recovery (relying on the original energy of the formation) and secondary oil recovery (developed by water injection). Tertiary oil recovery methods include chemical flooding, thermal oil recovery, gas phase flooding, and microbial flooding. Among them, chemical flooding is the most commonly used oil flooding method among existing tertiary oil recovery methods. Chemical flooding includes polymer flooding. , compound flooding, alkali flooding, surfactant flooding. [0003] With the further popularization and application of chemical flooding polymer flooding technology, there are fewer and fewer oilf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
CPCC09K8/584C09K8/588
Inventor 王俊德
Owner 山东滨州昱诚化工科技有限公司
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