نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده نفت و گاز صنعتی سهند تبریز
2 دانشگاه صنعتی سهند
3 شرکت مهندسی و توسعه نفت، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
One of the significant challenges in enhanced oil recovery studies is controlling and diverting the path of injected fluid towards target zones containing more remaining oil. One of the promising methods for fluid diversion is using foam to increase the performance of injected flow behavior. However, to achieve such a performance, it is necessary to investigate the foam flow behavior at the pore scale to elucidate the governing mechanisms involved in the diversion process. To this end, a porous medium pattern was designed, consisting of dual-layer with different permeabilities and cross flow between them. To conduct experiments, first the oil-saturated micro-model was flooded by brine to reach its residual oil saturation condition. Subsequently, foam performance was examined in the form of simultaneous gas and foaming agent injection. In this study, sodium dodecyl sulfate was used as the foaming agent at 35000 ppm of NaCl brine. Results showed that in gas injection, due to very high gas mobility and thus no enough pressure gradient for liquid diversion, oil recovery was only obtained from high permeability later with almost no contribution from low permeability layer. However, foaming the injected gas improved gas apparent viscosity and thus improving in the heterogeneous dual-layer system in a way that diversion of the injected fluid from the high permeability to low permeability layer occurred. Accordingly, fluid diversion by foam led to an increase in residual oil production from the low permeability layer, increasing the production efficiency from 9% to 85%. The effectiveness of foam injection in a heterogeneous, layered porous media and subsequently increasing residual oil production could be described in the light of viscous cross-flow, diverting the injected fluid from high to low permeability regions, and also enhancing the performance of gas displacement front. Results of this study indicate the promising potential of foam as a viable fluid diversion agent for controlling the mobility of injected fluid in a heterogeneous, layered system.
کلیدواژهها [English]
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