烟道气泡沫封堵参数优化及微观机理研究

Abstract

Abstract:

In order to solve the problems such as the breakthrough of flue gas, frontal advance of combustion drive and conventional plugging technology do not meet the requirement of fire drive in the fire drive test area of Hongshanzui oilfield in Xinjiang. We used the device for testing the foam flow in core and the visual microscopic displacement model to study the flow experiment and the microscopic mechanism of flue gas foam. The experimental investigation showed: the gas-liquid ratio was an important factor that affects the capacity of foam blocking; the foam blockage ability was the strongest when the foam system was mixed with gas and the gas-liquid with ratio 1∶1; the oil recovery factor increased by 12.6 % after the flue gas foam injection. The microscopic mechanism research showed: the main reason why foam had the ability of blockage was the new foam blocked the big pore and increased the flow resistance of the fluid. The migration of foam in porous media was a kind of separate migration of gas phase and liquid phase; the trap and flow state of the foam were constantly transformed with the change of external conditions. The study can provide reference for the control of gas channeling in the fire flooding test area of Hongshanzui oilfield in Xinjiang and is helpful to improve the theory of bubble control.

Key words: flue gas foam, control gas channeling, microscopic mechanism, combustion

CLC Number:

TE357.4

Wang Jian,Qin Da,Yu Heng,Xu Peng,Hu Yuhan. Optimization of parameters and microscopic mechanism study of flue gas foam[J].Reservoir Evaluation and Development, 2018, 8(6): 33-38.

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References 17

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组号	长度/ cm	直径/ cm	孔隙体积/cm³	孔隙度, %	原始水测渗透率/10^-3μm²
TH—02	50	2.0	48.6	30.95	1 135
TH—03	50	2.0	52.5	33.47	1 314
TH—04	50	2.0	54.2	34.52	1 577
TH—05	50	2.0	51.5	32.78	1 278

注入方式		基础压差/MPa	工作压差/MPa	阻力因子
气液混注		0.06	5.880	98.0
气液交替注入	1PV液1PV气	0.06	4.872	81.2
	2PV液2PV气	0.06	4.608	76.8
	3PV液3PV气	0.06	4.590	76.5

水驱油阶段					泡沫驱阶段				后续水驱阶段
流速/(mL·min^-1)	出油体积/mL	水驱油采收率,%	残余油饱和度,%	稳定压力/MPa	气液比	出油体积/mL	稳定压力/MPa	阻力因子	后续水驱稳定压力/MPa	提高采收率,%	总采收率	残余阻力因子
1.0	24.8	62.5	37.5	0.14	1:1	5.0	3.38	24.1	0.73	12.6	75.1	5.21

Optimization of parameters and microscopic mechanism study of flue gas foam

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