Abstract
ABSTRACT Nitrogen is widely used in the development of unconventional reservoirs. Due to relatively strong heterogeneity, a double flow space well (DFSW) has been proposed for nitrogen injection. In the DFSW, the flow behaviors of nitrogen in the inner flow space (IFS) and outer flow space (OFS) will influence each other. In this paper, a series works were done on modeling of the nitrogen flow in DFSW. Results show that: (a) when the length of microelement section is equal to 5 m, the heat conduction rates in both IFS and OFS increases with the DFSW depth. For IFS, it increases from 0 W/m to 29.5919 W/m, while for OFS, it increases from 0 W/m to 101.89 W/m. (b) when the mass flux increases from 0.9 kg/s to 2.9 kg/s, the hydraulic pressure gradient, and the Joule-Thompson effect alternately dominate. (c) As the DFSW depth increases from 0 m to 1500 m, the thermal conductivity rates in IFS and OFS are always positive.
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