Special Oil & Gas Reservoirs >

2021 , Vol. 28 >Issue 4: 102 - 107

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.04.014

Reservoir Engineering

Effect of Hydrophobic Carbon Chain Length of Alkyl Betaine Surfactant on Spontaneous Imbibition of Low-permeability Core

  • Zhu Weiyao ,
  • Zhao Chengyuan ,
  • Ma Qipeng ,
  • Li Hua ,
  • Song Zhiyong
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  • University Of Science & Technology Beijing, Beijing 100083, China

Received date: 2020-08-24

  Revised date: 2020-10-25

  Online published: 2022-02-18

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Abstract

In view of the influence of different hydrophobic carbon chain lengths of alkyl betaines with the same hydrophilic group structure on the imbibition mechanism, the influence of the hydrophobic carbon chain length of alkyl betaine on spontaneous imbibition under the conditions of high temperature, high salinity and low permeability conditions was analyzed by experiments conducted on spontaneous imbibition, contact angle and oil-water interfacial tension. The results showed that with the increase of carbon number of the hydrophobic group from 12 to 18, the degree of imbibition and recovery of the four alkyl betaines were 37.8%, 39.4%, 41.0% and 42.1%, respectively; the reverse imbibition was adopted; the contact angle decreased with the increase of carbon number, favorable to crude oil stropped from the core, and the interfacial tension decreased with the increase of carbon number, conducive to the deformation and flow of oil droplets, both of which promoted the imbibition. The experimental results were in line with the normalized recovery percent model, with a theoretical guidance for the application of alkyl betaine as a imbibition agent in low-permeability oil fields.

Key words： alkyl betaine; low permeability reservoir; amphoteric surfactant; spontaneous imbibition; interfacial tension; wettability

Cite this article

Zhu Weiyao , Zhao Chengyuan , Ma Qipeng , Li Hua , Song Zhiyong . Effect of Hydrophobic Carbon Chain Length of Alkyl Betaine Surfactant on Spontaneous Imbibition of Low-permeability Core[J]. Special Oil & Gas Reservoirs, 2021 , 28(4) : 102 -107 . DOI: 10.3969/j.issn.1006-6535.2021.04.014

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