Adaptability of Low Molecular Weight Salt-Resistant Hydrophobic Associating Polymer in Low Permeability Reservoir

Abstract

B3 block of Changqing Oilfield has low reservoir permeability and high salinity formation water. In order to solve the problems of poor injection and salt resistance of conventional polymers and further improve the development effect of polymer flooding, the adaptability of low molecular weight anti-salt hydrophobic associating polymers in this test area is studied. The viscosity, salt resistance, shear resistance, adsorption resistance and aging stability of the polymer were measured by laboratory experiments. The experimental results show that compared with polyacrylamide and functional polymer, the low molecular weight salt-resistant hydrophobic associating polymer has better salt resistance, shear resistance and stability. The viscosity of 2000 mg/L polymer is 28 mPa·s at 50 ℃ and 13600 mg/L mineralization (572 mg/L calcium and magnesium ion concentration). The core with 70–80 mD permeability was used for oil displacement experiments. The results showed that the viscosity retention rate of polymer flooding solution reached 80%, and the oil displacement efficiency can be improved by 14.8% on the basis of water flooding.

Copyright 2023, IFEDC Organizing Committee. This paper was prepared for presentation at the 2023 International Field Exploration and Development Conference in Wuhan, China, 20–22 September 2023.This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.