Title: Experimental study on a combined profile modification system for EOR by starch graft copolymer gel and N₂ foam

Authors: Wei Su; Jirui Hou; Chunyang Lv; Juan Liu

Addresses: Research Institute of Enhanced Oil Recovery, China University of Petroleum (Beijing), Fuxue Road No. 18, Changping District, Beijing, China ' Research Institute of Enhanced Oil Recovery, China University of Petroleum (Beijing), Fuxue Road No. 18, Changping District, Beijing, China ' Research Institute of Enhanced Oil Recovery, China University of Petroleum (Beijing), Fuxue Road No. 18, Changping District, Beijing, China ' Research Institute of Enhanced Oil Recovery, China University of Petroleum (Beijing), Fuxue Road No. 18, Changping District, Beijing, China

Abstract: A combined profile modified system of starch graft copolymer (SGC) gel and N₂ foam was investigated to solve the problem of severe fluid channelling in multilayer heterogeneous reservoirs. The investigation was performed from three perspectives: formulas optimisation, blocking performance and oil displacement experiments to demonstrate synergetic blocking effect of the two plugging agents. The results show that this combined profile modified system could plug the higher permeability layers to force the subsequent injected water to mobilise the remaining oil in the lower permeability layer and create synergetic effect to improve oil recovery. [Received: March 8, 2016; Accepted: April 21, 2017]

Keywords: combined profile modified system; starch graft copolymer gel; N₂ foam; blocking ability; oil increment.

DOI: 10.1504/IJOGCT.2018.089957

International Journal of Oil, Gas and Coal Technology, 2018 Vol.17 No.2, pp.189 - 207

Received: 08 Mar 2016
Accepted: 21 Apr 2017
Published online: 26 Feb 2018 *

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