As the vertical-well fire flooding technology is industrially applied in the steam-injection old heavy oil areas of Xinjiang and Liaohe oilfields,its enhanced oil recovery potential is gradually clear.According to lab...As the vertical-well fire flooding technology is industrially applied in the steam-injection old heavy oil areas of Xinjiang and Liaohe oilfields,its enhanced oil recovery potential is gradually clear.According to laboratory experiment,field test and reservoir engineering,the displacement characteristics of verticalwell fire flooding in the steam-injection old heavy oil areas are systematically investigated.Laboratory experiments and core data show that the vertical-well fire flooding has significantly high flooding ef-ficiency,no residual oil are remained in the firing front sweeping zone,and the lateral sweep efficiency and ultimate recovery can be achieved.The vertical-well fire flooding is a strategic replacement technology to enhance the recovery greatly.Development characteristics and advantages of areal and linear fire flooding are well investigated,and research results are applied in the design of industrial test plan of fire flooding in the Hongqian block,Xinjiang.The research shows that the linear well pattern has advantages of easy construction of ground facilities and management,less well of stage management,simple matching technology and easy achievement of purposeful control for fire front;the areal well pattern has advantages in reducing the air/oil ratio during the fire flooding period,increasing the total recovery rate of reservoirs and reducing the geological and reservoir management risks.To select well patterns of fire flooding,some factors such as geology,reservoir,fluid properties,oil price,and reservoir development degree should be mainly considered.In the Hongqian block,an improved linear well pattern with a combination of new wells and old wells is applied,this not only absorb experiences of linear well pattern pilot test,but also use advantages of areal well pattern.展开更多
Physical modeling,numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state,thermal oxidation front characteristics and production dynamic characteristics of high...Physical modeling,numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state,thermal oxidation front characteristics and production dynamic characteristics of high pressure air injection thermal oxidation miscible flooding technology.The lighter the composition and the lower the viscosity of the crude oil,the lower the fuel consumption and the combustion temperature are.The thermal oxidation front of light oil and volatile oil can advance stably,and a medium-temperature thermal oxidation stable displacement state can be formed in the light oil reservoir under high pressure conditions.With strong thermal gasification and distillation,light oil and volatile oil are likely to form a single phase zone of gasification and distillation with thermal flue gas at the high-temperature and high-pressure heat front,finally,an air-injection thermal miscible front.In light oil reservoirs,the development process of high-pressure air-injection thermal miscible flooding can be divided into three stages:boosting pressure stage,low gas-oil ratio and high-efficiency stable production stage and high gas-oil ratio production stage.Approximately 70%of crude oil is produced during the boosting pressure stage and low gas-oil ratio high-efficiency and stable production stage.展开更多
基金The work was supported by the National Science and Technology Major Project of China(No.2016ZX05012-003).
文摘As the vertical-well fire flooding technology is industrially applied in the steam-injection old heavy oil areas of Xinjiang and Liaohe oilfields,its enhanced oil recovery potential is gradually clear.According to laboratory experiment,field test and reservoir engineering,the displacement characteristics of verticalwell fire flooding in the steam-injection old heavy oil areas are systematically investigated.Laboratory experiments and core data show that the vertical-well fire flooding has significantly high flooding ef-ficiency,no residual oil are remained in the firing front sweeping zone,and the lateral sweep efficiency and ultimate recovery can be achieved.The vertical-well fire flooding is a strategic replacement technology to enhance the recovery greatly.Development characteristics and advantages of areal and linear fire flooding are well investigated,and research results are applied in the design of industrial test plan of fire flooding in the Hongqian block,Xinjiang.The research shows that the linear well pattern has advantages of easy construction of ground facilities and management,less well of stage management,simple matching technology and easy achievement of purposeful control for fire front;the areal well pattern has advantages in reducing the air/oil ratio during the fire flooding period,increasing the total recovery rate of reservoirs and reducing the geological and reservoir management risks.To select well patterns of fire flooding,some factors such as geology,reservoir,fluid properties,oil price,and reservoir development degree should be mainly considered.In the Hongqian block,an improved linear well pattern with a combination of new wells and old wells is applied,this not only absorb experiences of linear well pattern pilot test,but also use advantages of areal well pattern.
基金Supported by the Science and Technology Project of PetroChina Exploration and Production Company.
文摘Physical modeling,numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state,thermal oxidation front characteristics and production dynamic characteristics of high pressure air injection thermal oxidation miscible flooding technology.The lighter the composition and the lower the viscosity of the crude oil,the lower the fuel consumption and the combustion temperature are.The thermal oxidation front of light oil and volatile oil can advance stably,and a medium-temperature thermal oxidation stable displacement state can be formed in the light oil reservoir under high pressure conditions.With strong thermal gasification and distillation,light oil and volatile oil are likely to form a single phase zone of gasification and distillation with thermal flue gas at the high-temperature and high-pressure heat front,finally,an air-injection thermal miscible front.In light oil reservoirs,the development process of high-pressure air-injection thermal miscible flooding can be divided into three stages:boosting pressure stage,low gas-oil ratio and high-efficiency stable production stage and high gas-oil ratio production stage.Approximately 70%of crude oil is produced during the boosting pressure stage and low gas-oil ratio high-efficiency and stable production stage.