Knowledge of the variability of fluid compressibility with pressure and temperature is essential in performing many reservoir engineering calculations. For a liquid phase, the compressibility is small and usually assumed to be constant. For a gas phase, the compressibility is neither small nor constant. By definition, the isothermal gas compressibility is the change in volume per unit volume for a unit change in pressure or, in equation form:

Cg = 1/ p – 1/Z (ƏZ / ƏP) at constant temp.

For ideal gas Z=1 and (ƏZ / ƏP) =0, therefore:

Cg = 1/ p

The gas formation volume factor is used to relate the volume of gas, as measured at reservoir conditions, to the volume of the gas as measured at standard conditions, i.e., 60°F and 14.7 psia. This gas property is then defined as the actual volume occupied by a certain amount of gas at a specified pressure and temperature, divided by the volume occupied by the same amount of gas at standard conditions. In an equation form, the relationship is expressed as:

Bg = (Vp,T / V sc)

Where

Bg = gas formation volume factor, ft3/scf

Vp,T = volume of gas at pressure p and temperature, T, ft3

Vsc = volume of gas at standard conditions, scf

Applying the real gas equation-of-state and substituting for the volume V, gives

Bg = (Psc / Tsc) (ZT/P**)**

Where Zsc = Z – factor at ideal condition= 1.0

Psc and Tsc are pressure and temperature at standard condition.

Assuming that the standard conditions are represented by psc =14.7 psia and Tsc = 520, the above expression can be reduced to the following relationship:

Bg = .0287 (zT/ P)

Where

Bg = gas formation volume factor, ft3/scf

Z = gas compressibility factor

T = temperature, °R

The viscosity of a fluid is a measure of the internal fluid friction (resistance) to flow. If the friction between layers of the fluid is small, i.e., low viscosity, an applied shearing force will result in a large velocity gradient. As the viscosity increases, each fluid layer exerts a larger frictional drag on the adjacent layers and velocity gradient decreases. The viscosity of a fluid is generally defined as the ratio of the shear force per unit area to the local velocity gradient. Viscosities are expressed in terms of poises, centipoises, or micro poises. One poise equals a viscosity of 1 dyne-sec/cm2 and can be converted to other field units by the following relationships:

1 poise = 100 centipoises**To Schedule a Compressibility Of Natural Gases tutoring session click here
To submit Compressibility Of Natural Gases assignment click here.**

Petroleum Assignment Help

- General Composition Of Petroleum
- Physical Properties Of Hydrocarbons
- Origin of Petroleum
- Fundamental properties Of Fluid Permeated Rocks
- Porosity
- Permeability
- The Klinkenberg Effect
- Saturation
- Wettability
- Capillary Pressure
- Relative Permeability
- Drainage Process
- Three phase Relative Permeability
- Rock Compressibility
- Fundamentals Of Reservoir Fluid Behavior

Petroleum Assignment Help

- Classification Of Reservoir And Reservoir Fluids
- Gas Reservoirs
- Fundamentals Of Reservoir Fluid Flow
- Types Of Fluids
- Properties Of natural Gases
- Behavior Of Ideal Gases
- Behavior of Real Gases
- Compressibility Of Natural Gases
- Properties Of Crude Oil Systems
- Gas Solubility
- Determination And Application of Reservoir Fluid Properties
- Composition Of The Reservoir Fluid
- Differential Liberation Test
- Separator Tests
- Fluid Analysis Data On Gas

Petroleum Assignment Help

- Constant-Volume Depletion
- Oil Recoverymechanisms And The material Balance Equation
- Primary Recovery Mechanisms
- The Depletion Drive Mechanism
- Gas Cap Drive
- The Water Drive Mechanism
- Water Production
- The Gravity-Drainage-Drive Mechanism
- The Combination-Drive Mechanism
- The Material Balance Equation
- Change in Pore Volume Due to Initial Water and Rock Expansion
- Gas Reservoirs Help
- The Volumetric Method
- The material Balance Method

Basic Subject

Computer Science

- Programming Assignment Help
- Database Help
- Data Structure Assignment Help
- Operating Systems Assignment Help
- Computer Network Assignment Help
- UML Diagram Assignment Help
- IT Assignment Help
- Game Programming
- Computer Science Assignment Help
- Medical Science Assignment Help
- Social Science Assignment Help
- Information Systems

Engineering

- Biochemical and Biotechnology Help
- Chemical Engineering Assignment
- Statistics Assignment Help
- Civil Engineering Assignment Help
- Electrical, Electronics Help
- Mathematics, Computing Assignment Help
- Mechanical and Industrial Engg. Help
- Petroleum Engg. Assignment Help
- Biochemistry Assignment Help
- Cell Biology Assignment Help
- Arts and Architecture Help
- Silverlight Assignment Help