Prediction of Heavy Oil Steam Stimulation Based on Data-Driven and Mechanism Model

Table 6

Parameter description.

Letter	Physical quantity	Unit
hs	The enthalpy of saturated steam at a certain pressure	kcal/kg
	The enthalpy of saturated water under a certain pressure	kcal/kg
	Steam dryness of boiler outlet	Decimal
	Steam dryness of steam injection wellhead	Decimal
L	Length of pipeline	m
is	Saturated steam mass flow rate	kg/h
ql	Heat loss per unit time and unit length of steam pipeline	kcal/(h·m)
P	The pressure at a point in the wellbore	kgf/m^2
Z	Well depth	m
ρm	The density of the saturated steam mixture	kg/m^3
G	Acceleration of gravity	m/s^2
τf	Friction loss gradient	(Kgf/m^2)/m
V	The flow rate of the saturated steam mixture	m/h
r2	The outer radius of the inner pipe	m
U2	Overall heat transfer coefficient	kcal/(h·m^2·°C)
Ts	Steam temperature	°C
Th	Outer-edge temperature of cement ring	°C
	The volume flow of steam	m^3/h
Ap	Pipe cross-sectional area	m^2