The isothermal compressibility coefficient is essentially the controlling factor in identifying the type of the reservoir fluid. In general, reservoir fluids are classified into three groups:

- Incompressible fluids
- Slightly compressible fluids
- Compressible fluids

The isothermal compressibility coefficient c is described mathematically by the following two equivalent expressions.

In terms of fluid volume.

C = - 1/ V (ƏV/ ƏP)

In terms of fluid density.

C = 1/ρ (Əρ / ƏP)

Where V and ρ are volume and density respectively.

**Incompressible fluids**

An incompressible fluid is defined as the fluid, whose volume (or density) does not change with pressure, i.e.

ƏV/ ƏP = 0

Əρ / ƏP = 0

Incompressible fluids do not exist; this behavior, however, may be assumed in some cases to simplify the derivation and the final form of many flow equations.

**Slightly compressible fluids**

These “slightly” compressible fluids exhibit small changes in volume, or density, with changes in pressure.

**Compressible fluid**

These are fluids that experience large changes in volume as a function of pressure. All gases are considered compressible fluids. The isothermal compressibility of any compressible fluid is described by the following expression:

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

There are basically three types of flow regimes that must be recognized in order to describe the fluid flow behavior and reservoir pressure distribution as a function of time. There are three flow regimes:

- Steady-state flow
- Unsteady-state flow
- Pseudo steady-state flow

The flow regime is identified as a steady-state flow if the pressure at every location in the reservoir remains constant, i.e., does not change with time. Mathematically, this condition is expressed as (ƏP / Ət) at any position remain zero.

The above equation states that the rate of change of pressure p with respect to time t at any location is zero. In reservoirs, the steady-state flow condition can only occur when the reservoir is completely recharged and supported by strong aquifer or pressure maintenance operations.

**Unsteady-State Flow**

The unsteady-state flow (frequently called *transient flow*) is defined as the fluid flowing condition at which the rate of change of pressure with respect to time at any position in the reservoir is not zero or constant. This definition suggests that the pressure derivative with respect to time is essentially a function of both position i and time t, thus

(ƏP / Ət) = f (i, t)

**Pseudo steady-State Flow**

When the pressure at different locations in the reservoir is declining linearly as a function of time, i.e., at a constant declining rate, the flowing condition is characterized as the pseudo steady-state flow. Mathematically, this definition states that the rate of change of pressure with respect to time at every position is constant, or It should be pointed out that the pseudo steady-state flow is commonly referred to as semi steady-state flow and quasisteady-state flow.

(ƏP / Ət)= Constant

**Reservoir geometry**

The shape of a reservoir has a significant effect on its flow behavior. Most reservoirs have irregular boundaries and a rigorous mathematical description of geometry is often possible only with the use of numerical simulators. For many engineering purposes, however, the actual flow geometry may be represented by one of the following flow geometries:

- Radial flow
- Linear flow
- Spherical and hemispherical flow

**Radial Flow**

In the absence of severe reservoir heterogeneities, flow into or away from a well bore will follow radial flow lines from a substantial distance from the well bore. Because fluids move toward the well from all directions and coverage at the well bore, the term *radial flow *is given to characterize the flow of fluid into the well bore.

**Linear Flow**

Linear flow occurs when flow paths are parallel and the fluid flows in a single direction. In addition, the cross sectional area to flow must be constant. A common application of linear flow equations is the fluid flow into vertical hydraulic fractures.

**Spherical and Hemispherical Flow**

Depending upon the type of well bore completion configuration, it is possible to have a spherical or hemispherical flow near the well bore. A well with a limited perforated interval could result in spherical flow in the vicinity of the perforations. A well that only partially penetrates the pay zone, could result in hemispherical flow. The condition could arise where coning of bottom water is important.

**To Schedule a Types Of Fluids tutoring session
To submit Types Of Fluids 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 Recovery mechanisms 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

Assignment Writing Help

- Science Assignment Help
- Math Assignment Help
- Chemistry Assignment Help
- Physics Assignment Help
- Biology Assignment Help
- Psychology Assignment Help
- History Assignment Help
- Geography Assignment Help
- English Assignment Help
- Humanities Assignment Help
- Nursing Assignment Help
- Social Science Assignment Help
- Arts and Architecture Help
- Statistics Assignment Help
- Law Assignment Help
- Computational Mathematics Assignment Help

Engineering Assignment Services

- 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 Help
- Computer Science Assignment Help
- Information Systems Assignment Help
- Chemical Engineering Assignment Help
- Civil Engineering Assignment Help
- Electrical, Electronics Help
- Mechanical Engineering Assignment Help
- Petroleum Engineering Assignment Help
- Biochemical and Biotechnology Help

Do My Assignment Help

- Accounting Assignment Help
- Finance Assignment Help
- Economics Assignment Help
- Marketing Assignment Help
- Human Resources Assignment Help
- Operations Management Assignment Help
- Strategy and Planning Help
- Project Management Help
- Case Studies Writing Help
- Political science
- Referencing Help
- Assignment Help Websites
- Online Assignment Help
- Do My Assignment
- Do My Homework
- Health Informatics

Write My Essay Services

- Essay Writing Help
- Business Essay Writing Help
- Assignment Writing Services
- Plagiarism Free Essay Writing
- Essay Editing Service
- Dissertation Writing Services
- Thesis Writing Help
- Custom Writing Help
- Write My Essay
- Write My Paper
- Paper Writing Service
- Academic Writing Help
- College Essay Writing
- Cheap Essay Writing