Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 160-168.doi: 10.12108/yxyqc.20230114

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

SAGD production performance prediction model based on unsteady heat transfer

DING Chao1, WANG Pan1, QIN Yadong2, LIANG Xiangjin1, ZHENG Aiping1, LI Ning1, XING Xiangrong1   

  1. 1. PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. Faculty of Petroleum Engineering, University of Alberta, Edmonton T6 G1 H9, Canada
  • Received:2022-04-11 Revised:2022-06-08 Online:2023-01-01 Published:2023-01-06

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Abstract: According to the theories of heat transfer and thermal recovery，the SAGD (steam-assisted gravity drainage) unsteady heat transfer model and the analytical solutions of key development indexes were derived， which were taken into account for boundary effect. The rapid prediction of development indexes was realized by using the program design method. The results show that: (1) The existing unsteady heat transfer models have limitations on the temperature assumption of the outer boundary of heat transfer. According to the principle of energy conservation，the outer boundary condition of heat transfer was modified，and the analytical relationship between the heat transfer depth and the accumulated heat transfer was established，which can be used to quantitatively calculate the heat loss of the overburden and underburden. (2) On the basis of Butler’s classical SAGD production model，the analytical models of water production，oil-steam ratio and steam heat utilization ratio in the steam chamber rising stage，lateral expansion stage and downward expansion stage were derived respectively，which can realize the rapid prediction of key indicators in the specific development stage or the whole life cycle of SAGD. (3) By comparing with the actual production indexes of the well group in 6.4 years，the coincidence rates of predicted oilsteam ratio and predicted water-cut are above 95%，which confirms the reliability of the analytical model and the program design. (4) According to the reservoir parameters of Zhong 32 well area in Fengcheng oilfield of Junggar Basin，the predicted and analyzed SAGD steam heat utilization rate and key development indicators under different oil layer thickness conditions show that when the steam heat utilization ratio is greater than 35% and the oilsteam ratio is greater than 0.15，the corresponding oil layer thickness should be greater than 12 m.

Key words: unsteady heat transfer, steam-assisted gravity drainage, heat loss, steam heat utilization ratio, oilsteam ratio, Zhong 32 well area, Fengcheng oilfield, Junggar Basin

CLC Number: 

  • TE345
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