Production performance analysis and parameter optimization for lifting heavy oil by mixing light hydrocarbon in ultradeep wells
Usually, viscosity reduction is a valid approach to producing heavy oil. Combustion in situ, steam stimulation, visbreaking by chemicals and electric heating are all approaches to reducing viscosity. The heavy oil producing from Tahe oilfield is distinctiveness. The buried depth is about 5,400m, formation temperature is very high, it is about 135℃. The heavy oil has favorite flow properties in the reservoir condition. But while the oil is lifting to the ground, its viscosity increases gradually and flowability is decreasing inch by inch. It is necessary to reduce oil viscosity in wellbore. Research shows that the technology of lifting heavy oil by mixing light hydrocarbon in wellbore is the most applicable and effective for Tahe ultra-deep well. At present, this technology has been applied on producing deep heavy oil in Tahe oilfield successfully. But due to the complexity of the flow performance of Tahe oil in wellbore, it is difficult to solve the following problems: how to set on the suitable mixing ratio of light hydrocarbon to heavy oil and how to use the minimum light hydrocarbon to obtain the maximum heavy oil production. This paper presents a modified model of physical property of Tahe crude oil,which shows better eorrelativity with PVT curve measured in place. Then, use a computing method of flow temperature gradient in wellbore according to various hydrocarbon mixing mode. In this process, the computing of multiphase flow at curved portion in deep well is successfully solved. Then, the regulation of parameter distribution in any wellbore shape is worked out. On this basis, the production performance analysis model of heavy oil mixing light hydrocarbon is established based on the principle of energy equilibrium and petroleum engineering. This model can be used to analyze quantitatively and simulate the production performance of ultra-deep wells, to optimize mixing ratio and parameters of production. The optimal mixing ratio and injection pressure will guide the adoption of appropriate working system and determination the economical boundary of mixing ratio. This technology has received satisfactory effect in Tahe oilfield.
Z Shi P Zhao Z Li Q Chen
Petroleum Exploration & Production Research Institute, Sinopec Corp., China click and type author initials, surname click and type author company Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, China Sinopec Northwest Company, China
国际会议
首届世界重油大会(The Technical Sessions of the First World Heavy Oil Conference)
北京
英文
1145-1146
2006-11-12（万方平台首次上网日期，不代表论文的发表时间）