1	PETE 310 Lecture # 5 Phase Behavior – Pure Substances
2	Learning Objectives After completing this chapter you will be able to: Understand pure component phase behavior as a function of pressure, temperature, and molecular size. Understand the behavior of binary and multicomponent mixtures (lectures 6 & 7)
3	The Need to Understand Phase Behavior As oil and gas are produced from the reservoir, they are subjected to a series of pressure, temperature, and compositional changes. Such changes affect the volumetric and transport behavior of these reservoir fluids and, consequently, the produced oil and gas volumes.
4	The Need to Understand Phase Behavior Except polymer flooding, all of EOR methods rely on the phase behavior of reservoir fluids and fluids injected into the reservoir. This behavior is used to classify the recovery method (i.e., thermal, miscible, chemical, etc.), and to design the recovery process.
5	Major Definitions System: A body of matter with finite boundaries (physical or virtual) Closed System: Does not exchange matter with surroundings but may exchange energy (heat). Open System: Does exchange matter and energy with surroundings.
6	Major Definitions Phase: A portion of the system which has homogeneous intensive properties and it is bounded by a physical surface. Interface: Separates two or more phases. These phases are solid, liquid(s), and gas.
7	Major Definitions Intensive Properties: Independent of system mass (i.e density) Extensive Properties: Dependent of system mass (i.e volume)
8	Major Definitions Homogeneous System: Intensive properties change continuously and uniformly (smoothly) Heterogeneous System: System made up of two or more phases in which the intensive properties change abruptly at phase-contact surfaces
9	Major Definitions Properties: Characteristics of a system (phase) that may be evaluated quantitatively. These are, Phase density (liquid, gas, solid) Compressibility Surface tension Viscosity Heat capacity Thermal conductivity
10	Phase Diagrams Types of phase diagrams for a single component (pure substance) (PT) (PV) or (Pr) (TV) or (Tr)
11	Phase Diagrams Single Component Phase Diagram
12	Phase Diagrams
13	Hydrocarbon Families Physical Properties
14	Pressure vs Specific Volume Pure Substance
15	Pure Component Properties Tabulated critical properties (McCain)
16	Heat Effects Accompanying Phase Changes of Pure Substances
17	Heat Effects Accompanying Phase Changes of Pure Substances
18	Example of Heat Effects Accompanying Phase Changes Steam flooding Problem: Calculate how many BTU/day (just from the latent heat of steam) are provided to a reservoir by injecting 6000 bbl/day of steam at 80% quality and at a T=462 ^oF
19	COX - Vapor Pressure Charts (normal paraffins)
20	Determination of Fluid Properties Ps =saturation pressure
21	Vapor Pressure Determination
22	Homework See Syllabus for HW Problems due