关键词: 油田开发, 低频, 波动, 水嘴, 注水, 采收率

Abstract: Water flooding is a popular technology used for oil-displacement in middle and later period of oilfield development.The no-zzles used for water injection are cylindrical nozzles that spray continuous jet.This paper discusses how to enhance water injection rate and oil recovery efficiency using self-resonating pulsating injection method theoretically,and its feasibility in engineering.Self-resonating pulsating nozzle for water injection has been designed and tested in the laboratory. The jet velocity pulsation is determined by a hotwire anemometer.By Fourier transform the power spectral density functions of the pulsation velocity is obtained and analyzed. The result shows that the self-resonating pulsating nozzle described in the paper can spray pulsating jet of low frequency and large velocity.The maximum pulsating velocity is 78 percent of the axial average velocity.The frequency of the velocity pulsation is less than 1300 Hz.Self-resonating pulsating water flooding technology does not need to change the current injection technique and does not need any other additional equipment.The only thing we need to do is to redesign the blanking plug in a very simple way.It is very significant to increase water injection rate and oil recovery efficiency by applying the redesigned plug.

Key words: oilfield development, low frequency, fluctuation, water nozzle, water flooding, EOR