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    • 5. 发明授权
    • Viscous oil recovery method
    • 粘稠油回收方法
    • US4324291A
    • 1982-04-13
    • US144732
    • 1980-04-28
    • Kenny WongWilbur L. Hall
    • Kenny WongWilbur L. Hall
    • E21B43/18E21B43/24E21B47/06
    • E21B43/18E21B43/24
    • Disclosed is an improved viscous oil recovery method employing the injection of a thermal recovery fluid which may be steam or a mixture of steam and additives, and cycles of pressurization and drawdown. First the thermal recovery fluid is injected and production is restricted in order to increase the pressure in the reservoir. Injection is then terminated or decreased and production is increased in order to effect a pressure drawdown in the reservoir. Thereafter the production rate is decreased or production wells are shut in completely and non-condensable gas is injected to raise the pressure in the reservoir to a value which is from 50 to 90 percent of the final target pressure, after which the thermal recovery fluid is again injected into the formation to rebuild reservoir pressure with restricted production. Finally, production rate is increased and thermal recovery fluid injection is reduced or terminated in order to accomplish another reservoir drawdown cycle. Additional cycles of partial repressuring with non-condensable gas followed by steam injection followed by pressure drawdown production cycles may be employed.
    • 公开了一种改进的粘性油回收方法,其使用可以是蒸汽或蒸汽和添加剂的混合物的热回收流体的注入,以及加压和抽出的循环。 首先,热回收流体被注入并且生产被限制以增加储存器中的压力。 然后终止或减少注射,并且增加生产以实现储存器中的压力下降。 此后,生产率降低或生产井完全关闭,注入不可冷凝气体以将储层中的压力提高到最终目标压力的50%至90%的值,之后热回收流体为 再次注入地层,以有限的生产重建水库压力。 最后,提高生产率,减少或终止热回收流体注入,从而实现另一个储层下降循环。 可以采用用不可冷凝气体进行部分压制,然后进行蒸汽喷射,然后进行压力下降生产循环的附加循环。