Nanocellulose-regulated robust particle-gel for conformance improvement in fractured tight reservoirs: A mechanistic investigation of transport behavior and EOR performance in fracture models

Runxue Mao, Bing Wei, Qingtao Tian, Lele Wang, Jinyu Tang, Jun Lu, Xingguang Xu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Owing to the interpenetration of high-modulus nanocellulose into polyacrylamide (HPAM), the mechanical properties of particle gel were substantially improved. Five transport patterns in fractures were demonstrated as defined by particle/aperture ratio. The pressure drop (ΔP) generated by nanocellulose-regulated particle gel (NPG) depended on particle/fracture ratio, followed by NPG content and strength. A numerical model was established to correlate the stable ΔP of NPG with four critical operating parameters. The placement of NPG significantly remedied the conformance of the fractured cores; therefore, the subsequent CO2 and ultralow IFT surfactant injection processes produced additional oil recoveries of 4.7% and 7.1% original oil in place (OOIP), respectively, with the ultimate oil recoveries of 10.8% and 12.2% OOIP. However, the matrix oil was hardly mobilized during brine injection even after conformance treatment due to the adverse wettability and high capillary pressure.

Original languageEnglish
Article number118169
JournalChemical Engineering Science
Volume264
DOIs
Publication statusPublished - Dec 31 2022

Keywords

  • Conformance improvement
  • Enhanced oil recovery
  • Mechanically robust and eco-friendly particle gel
  • Nanocellulose
  • Unconventional reservoirs

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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