Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 169-177.doi: 10.12108/yxyqc.20240116

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Mechanism of DES+CTAB composite oil displacement agent system to improve oil recovery of low-permeability tight sandstone reservoirs

BAI Jiajia1,2, SI Shuanghu1, TAO Lei1, WANG Guoqing1, WANG Longlong1, SHI Wenyang1, ZHANG Na3, ZHU Qingjie1   

  1. 1. School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;
    2. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi'an Shiyou University, Xi'an 710065, China;
    3. School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
  • Received:2022-10-29 Revised:2022-12-09 Online:2024-01-01 Published:2024-01-02

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Abstract: Aiming at the problems of difficult water injection and low recovery in low-permeability tight reservoirs, an oil displacement agent composed of urea-based deep eutectic solvent(DES) and cetyltrimethylammonium bromide(CTAB) was developed to study the mechanism of reducing pressure and increasing injection and improving recovery in low-permeability tight sandstone reservoirs. The results show that:(1) The oil displacement agent system can reduce the oil-water interfacial tension to below 10-3 mN/m, which can greatly improve the oil washing efficiency.(2) The developed oil displacement agent has good clay mineral hydration inhibition, effectively avoiding the fluid sensitivity damage caused by the hydration expansion of clay minerals in low permeability tight sandstone.(3) The oil displacement agent system can modify the interface of sandstone surface. The oil phase contact angle of the samples after soaked by the oil displacement agent system increases from 25.8° to 61.4°, the hydrophilicity increases and the lipophilicity decreases, which contributes to the shedding of the oil film adsorbed on the rock surface.(4) The average reduction rate of injection pressure of advanced injection oil displacement agent is 79.64%, and the average recovery rate is 50.96%, which is much higher than the recovery rate of conventional water flooding(primary water injection→oil displacement agent injection→secondary water injection).

Key words: low-permeability tight sandstone reservoir, urea-based deep eutectic solvent, cetyltrimethylammonium bromide, water flooding, hydration expansion of clay minerals, surfactant, enhanced oil recovery

CLC Number: 

  • TE357
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