Coupling of steam chamber and liquid pool during steam-assisted gravity drainage process in heavy oil reservoirs
Shi, Lanxiang 1Li, Xiuluan 1Gou, Yan 1Liu, Peng 2Yi, Leihao3
扫码查看
点击上方二维码区域，可以放大扫码查看
作者信息
1. PetroChina
2. China Univ Geosci
3. PetroChina Co Ltd
折叠
Abstract
The flow mechanism between the injector and producer is different from the flow in the steam chamber in the Steam-Assisted Gravity Drainage (SAGD) process. The interwell flow between the injector and producer is determined by both gravity and the pressure difference. In this study, the interwell flow model is improved by introducing a relative permeability model and an oil viscosity linearity assumption, considering the availability of input data. The interwell flow in the liquid pool is coupled with the gravity drainage in the steam chamber throughout the entire SAGD process. And the liquid level calculated by the new model is validated by field data. The results show that the subcool gradient is larger in the earlier stage and smaller in the later stage. The liquid level, subcool, pressure difference and wellbore liquid rate are interacted and should be matched to each other. In field applications, the subcool should be controlled differently according to its development stage. The subcool of the hottest spot should be near zero to maximize the well productivity and the steam chamber supply capacity. The results of this study provide theoretical guidance for the evaluation and adjustment of field dual-horizontal SAGD well pairs.
Key words
Heavy oil reservoir/Steam-assisted gravity drainage (SAGD)/Liquid level/Coupled model/Subcool/RELATIVE PERMEABILITY/SUBCOOL/STIMULATION
NSTL
Elsevier