Title: Preparation and mechanism of viscosification for recyclable associating polymer with low damage for fracturing

Authors: Chengyu Zhou; Min Zhou; Linghao Zeng; Yuan Sun; Mingyao Lei; Yifan Li; Benhui Li; Wei Wan; Peng Zhang

Addresses: College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China ' College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China ' College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China ' College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China ' College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China ' College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China ' College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China ' China National Petroleum Corporation, Chuanqing Drilling Fluid Technology Service Company, Chengdu 610056, China ' College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

Abstract: Due to the complicated and variable formation conditions, P(AM-AA-APPEA) was developed. The viscosification mechanism was analysed via relative molecular weight, infrared spectroscopy (IR), nuclear magnetic resonance spectrum (1H-NMR), rheological properties, and scanning electron microscopy (SEM). It shows that M = 1.25*10⁶ (M represents molecular weight). The polymer is composed of amides, hydroxyl groups and benzene rings. When the shear rate is 170 s^-1 with continuous shear for 120 min at 90°, the viscosity is maintained at about 50 mPa·s. Gel breaking performance, formation damage, dynamic filtration, matrix permeability and fracture conductivity experiments show that it has easy glue breaking, low surface tension, low residue content, good compatibility and good rheological property. At 0.3% thickener concentration, the conductivity damage rate is 41.56%, the dynamic filtration coefficient is 4.24 * 10^-5 m·s^-1/ ², and the permeability loss rate is 16.4%. The recovery performance experimental results show that it has good recyclability. [Received: October 22, 2021; Accepted: July 28, 2022]

Keywords: associating polymer; viscosification mechanism; low damage; fracturing; scanning electron microscopy; SEM.

DOI: 10.1504/IJOGCT.2023.128880

International Journal of Oil, Gas and Coal Technology, 2023 Vol.32 No.3, pp.228 - 245

Received: 21 Oct 2021
Accepted: 28 Jul 2022
Published online: 08 Feb 2023 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article