›› 2019, Vol. 40 ›› Issue (4): 1-1.doi: 10.7657/XJPG20190414
GUO Bin, LIN Riyi, WANG Zeyu, MA Qiang, WANG Xinwei
Online:
Published:
Abstract: In order to study the improvement of oil displacement efficiency by superheated steam injection, an indoor single-tube experiment was carried out to study how the steam quality and injection rate influence the recovery factor, and the oil displacement mechanism was analyzed from four aspects:viscosity, permeability, thermal expansion coefficient and distillation ratio. The results show that when the steam injection rate is 1.8 mL/min, the steam with 15 ℃ degree of superheat is the optimal injected steam quality and the ultimate recovery factor can reach 77.8%; when the optimal steam quality is injected, the optimal steam injection rate will be 1.3 mL/min, and the ultimate recovery factor can reach 79.6%. After the oil displacement by superheated steam, the viscosity of heavy oil at 50 ℃ can be reduced by 40.7%. The average thermal expansion coefficient of the experimental oil is 0.000 653 ℃-1, the oil temperature increases by 300 ℃ and its volume will increase by 19.6%. The superheated steam will cause the transformation of montmorillonite and kaolinite to chlorite or illite, physical washing can increase the pore channel and improve the reservoir seepage behavior
CLC Number:
TE345
GUO Bin, LIN Riyi, WANG Zeyu, MA Qiang, WANG Xinwei. Experimental Study and Mechanism Analysis on Improvement of Oil Displacement Efficiency by Superheated Steam Injection[J]. , 2019, 40(4): 1-1.
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