Special Oil & Gas Reservoirs ›› 2024, Vol. 31 ›› Issue (6): 120-129.DOI: 10.3969/j.issn.1006-6535.2024.06.015

• Reservoir Engineering • Previous Articles     Next Articles

Optimization of Amphipathic MoS2 Nanofluids for Enhanced Oil Recovery in Low-Permeability Reservoirs by Response Surface Methodology

Liang Tuo1, Yin Chengfeng2, Qu Ming3, Yang Erlong3, Hou Jirui4, Yang Changhua1   

  1. 1. Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;
    2. PetroChina Daqing Oilfield Co.,Ltd,Daqing,Heilongjiang 163511,China;
    3. NEPU Sanya Offshore Oil & Gas Research Institute,Sanya,Hainan 572025,China;
    4. China University of Petroleum(Beijing),Beijing 102249,China
  • Received:2023-06-29 Revised:2024-08-17 Online:2024-12-25 Published:2025-01-22

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Abstract: By exploring the influence of multi-factor interaction on enhanced oil recovery of nanofluids,a response surface experimental is designed by using Box-Behnken method in Design Expert.Taking the recovery rate as the objective function,a quadratic polynomial regression equation is established among the injection pore volume multiple,the injection rate and the permeability.The significance analysis shows that the factors affecting the enhanced oil recovery by nanofluids are:permeability,injection pore volume multiple,injection rate;The response surface analysis indicated that the interaction between injection rate and permeability has the greatest impact on the enhanced oil recovery of nanofluids.In addition,the effects of permeability,shut-in time and injection mode on the enhanced oil recovery of nanofluids were studied by using the control variable method.The research indicates that when the nanofluid injection rate is 0.2 mL/min,the injected pore volume multiple is 0.5,the permeability is 1.00 mD,the shut-in time is 6 hours,and the injection mode is multi-cycle pill injecting,the recovery rate can be further increased by 18.63 percent points after a single water flooding.The research results have reference significance for the technical optimization of amphipathic MoS2 nanofluids for enhanced oil recovery in low-permeability reservoirs.

Key words: low permeability reservoirs, amphipathic MoS2 nanofluids, enhanced oil recovery, response surface methodology, controlled variable

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