水平井火驱辅助重力泄油燃烧状态及燃烧前缘预测

doi:10.7657/XJPG20200210

摘要/Abstract

摘要：

为预测超稠油水平井火驱辅助重力泄油燃烧状态和燃烧前缘,采用自主研发的火驱物理模拟实验装置,利用物质平衡法,结合生产动态数据,计算得到燃烧腔体积,预测水平井火驱辅助重力泄油的燃烧前缘;利用生产过程中的气体组分、温度和压力等参数,表征油层燃烧状态。结果表明,温度是最能直观反映燃烧状态的参数,稳定燃烧状态下的燃烧腔与水平井水平段延伸方向存在30°左右的夹角,呈超覆燃烧特征,在水平井上端形成结焦带和油墙,可防止火线进入水平井筒。水平井火驱辅助重力泄油的稳定燃烧期,产出气中CO₂含量高于10%,O₂含量低于3%,水平井段温度低于300 ℃,且油墙压差低于生产压差的一半,若以上特征参数不能满足,水平井则可能出现气窜。

关键词: 火驱, 燃烧前缘, 物理模拟, 燃烧腔, 油墙, 压差, 气窜, 结焦

Abstract:

Accurate prediction of combustion state and burning front in super-heavy oil horizontal wells during combustion assisted gravity drainage process is beneficial to the timely regulation and control of field test. Physical simulation experiments have been carried out with a self-developed 3D physical simulation model for fire flooding. Combining with the production data, the paper calculates the volume of combustion chamber to predict the combustion front in horizontal wells during combustion assisted gravity drainage process, and characterizes the combustion states of oil zone by using parameters such as gas components, temperature and pressure during production. The results show that temperature is a parameter which can directly reflect combustion state; under the steady combustion state there is an angle about 30° between the combustion chamber and the extension direction of the horizontal section in horizontal wells, showing an overlapping combustion feature; coking zone and oil bank form in the upper end of the horizontal well, which can prevent fire from advancing into the horizontal well. In the steady combustion stage during the combustion assisted gravity drainage process, the content of CO₂ in the produced gases is higher than 10%, the content of O₂ is lower than 3%, the temperature of the horizontal section is lower than 300 ℃ and the pressure differential of oil wall is lower than the half of the production pressure differential. Gas channeling will occur during fire flooding when the above conditions can not be reached.

Key words: fire flooding, burning front, physical simulation, combustion chamber, oil bank, pressure differential, gas channeling, coking

中图分类号:

TE357.41

彭小强, 韩晓强, 杨洋, 张继周, 徐景润. 水平井火驱辅助重力泄油燃烧状态及燃烧前缘预测[J]. 新疆石油地质, 2020, 41(2): 199-203.

PENG Xiaoqiang, HAN Xiaoqiang, YANG Yang, ZHANG Jizhou, XU Jingrun. Combustion State and Burning Front Prediction During Combustion Assisted Gravity Drainage Process in Horizonal Wells[J]. Xinjiang Petroleum Geology, 2020, 41(2): 199-203.

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