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Research on Factors Influencing Weak Alkali Surfactant Polymer Flooding System

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
  • Published:
Chemistry and Technology of Fuels and Oils Aims and scope

After 43 years of water drive development, the DG oilfield reached the stage of high recovery and ultrahigh watercut. At present, the efficiency of enhanced oil recovery (EOR) technologies, namely waterflooding, in the DG oilfield and the stable production are low. To develop and evaluate a new EOR mode, we have performed pilot tests comparing the waterflooding technique and the weak-alkali alkali/surfactant/polymer (ASP) flooding. Based on the laboratory tests, the formulation of the weak-alkali ASP flooding system has been developed. The objective of the new EOR method is to maintain the stability of the system under reservoir conditions. In this paper, we focus on the factors influencing the effectiveness of the proposed weak-alkali ASP system, including sodium and potassium ion concentrations, calcium and magnesium ion concentrations, water quality, and the shear viscosity of the solution. The results show that, depending on water quality and the ion concentrations, the interfacial tension of the developed weak-alkali ASP system can be maintained at an ultralow level below 10–3 mN/m. The influence of sodium and magnesium ion concentrations is slightly higher than that of potassium and calcium ion concentrations, respectively. Considering the cost-effectiveness of the new system, it is recommended that the solution be diluted with clean water mixed with oilfield sewage, and the calcium and magnesium ions be removed from the solution before preparation. When the core permeability is 95·10–3 μm2, the pore throat size has little effect on the molecular weight and viscosity of the system after shearing.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang, 48000, China

    Jie Liu, Kai Zhang & Linyong Huang

  2. College of Earth Science and Resources, Chang’an University, Xi’an Shanxi, 710064, China

    Hui Li

Authors
  1. Jie Liu
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  2. Kai Zhang
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  3. Linyong Huang
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  4. Hui Li
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Corresponding author

Correspondence to Kai Zhang.

Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 4, pp. 116–121, July–August, 2021.

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Liu, J., Zhang, K., Huang, L. et al. Research on Factors Influencing Weak Alkali Surfactant Polymer Flooding System. Chem Technol Fuels Oils 57, 724–731 (2021). https://doi.org/10.1007/s10553-021-01298-9

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  • DOI: https://doi.org/10.1007/s10553-021-01298-9

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