Thermal efficiency of well bore during steaming with bare tubing without packer
It is often practiced that steam injection tubing is bared and with no packer. So thewell head must be closed and the tubing interconnects with annular space at well bottom. Underthis condition, temperature and pressure in annular, as well as thermal efficiency of well bore areall different from that with packer used. Thermodynamic theory is used to calculated temperaturedistribution and thermal efficiency of the well bore under assumption that annular space is full ofvapor, and that saturated steam temperature (pressure) in the tubing and annular space are balancedat bottom hole. It is found that, compared with packer being used, temperature of casing innersurface and cement sheath outer surface is about 70_C and 60_C higher respectively, over-all heatloss is about 40％￠50％ higher. When steam injection rate being low, over-all heat loss increases, andpressure has much more impact on mass dryness fraction which can be less than 10％ at bottom hole.Steam injection rate has less impact on casing temperature than steam pressure does.
heavy crude steam injection well thermal efficiency temperature distribution
B.K.Gao L.Qiao
Department of Oil and Gas Engineering, University of Petroleum China, Beijing 102249, China CNPC Institute of Drilling Engineering, Beijing 100097, China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）