training specialists to the upstream oil and gas industry

Reservoir Analysis - Field Study Workshop

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Course overview

The workshop is designed to apply commonly available oil field data to describe and forecast future performance from an actual oil field example.
The participant is provided with a data set to describe reservoir limits, ultimate primary recovery under the current well setup and then provide recommendations for additional development.
These data are a structure map and type log, porosity and permeability information, pressure and production history and well test data.

Available information & field data

  • Log surveys and completion logs
  • Maps - structure, isopach maps and cross sections
  • Oil, gas and water production records
  • Pressure records and production test data
    • Static bottom hole pressures
    • Productivity index and open flow potential test data
  • Rock properties
    • Log analyses
    • Special core analysis
  • Reservoir fluid properties

The analysis process is designed around 23 tasks which must be completed in order to analyze reservoir behavior and in the end recommend methods for increasing recovery. Each task covers a different aspect of the total reservoir evaluation process.

The course is designed for

Reservoir engineers and professionals who work in collaboration with reservoir engineers, including well engineers, facilities engineers, process engineers, petrophysicists and geoscientists.

Course outline

Task 1 – Study structure map and well histories to analyze reservoir performance

Task 2 – Study well production histories to analyze reservoir performance

Task 3 – Plot BHP’s provided to determine well connectivity

Task 4 – Estimate initial pressure (Y0) and reservoir pressure at (Y8)

Task 5 – Calculate original oil (OOIP) and gas in place (OGIP)

Task 6 – Apply exponential decline principles to determine primary reserves

Task 7 – Study the structure map and production records to determine if you think a secondary gas cap was formed

Task 8 - Apply the results of a material balance study to determine OOIP and drive indices for the AA reservoir.

Task 9 – Calculate maximum recoverable with the difference in saturations equation

Task 10 - Apply API equations to calculate reserves for water drive & solution gas cases

Task 11 – Estimate displacement efficiency if a water flood were to be installed.  We will look at this again after the Stiles calculation

Task 12 - Calculate primary and secondary reserves

Task 13 – What has been the effect of water influx on performance?

Task 14 - Do you believe a water flood is feasible?

Task 15 – Calculate reasonable producing life

Task 16 – Apply material balance equation to calculate reservoir voidage.

Task 17 – Calculate water injection requirements.

Task 18 – Estimate production response to water injection. Klins and Clark.

Task 19 – Couple the core analysis record with the Stiles calculations to predict future performance.

Task 20 – Calculate hydraulic fracture pressure.

Task 21 - Apply Darcy equation to calculate water injection rate.

Task 22 – Estimate the effect of formation damage on the water injection rate.

Task 23 – Formulate a development plan.


Resevoir rocks

Log Profiles
Clastic and Carbonate Rocks

Fluid properties

Dry and Wet Gas – z-Factor and Gas Formation Volume Factor
Crude Oil - Specific Gravity, Gas Oil Ratio, Oil Formation Volume

Rock properties

Porosity and Permeability
Fluid Saturations - Fluid Distribution and Capillary Mechanisms

  • Pressure drop profile
  • Saturation profiles

Reservoir pressures and volumes

Measuring Bottomhole Pressures
Datum Pressures
Well Connectivity
Reservoir Volumes and Reserves
Isopach Maps

  • Calculate Original Oil and Gas In Place

Decline curves

Arps Curves

Oil reservoirs

Undersaturated and Saturated Reservoirs
Reservoir Depletion and Drive Mechanisms
Recovery Factors

  • As A Function of Drive Mechanism and Residual Oil Saturation
  • Empirical Correlations

The Material Balance Equation

  • Assumptions
  • Development of the General Equation
  • Combination Drive Reservoirs
    • Estimating Original Oil In Place
    • Estimating Water Influx
    • Calculation of Drive Indices

Example Problem

Oil well performance

Productivity Index
Inflow Performance Below the Bubble Point

  • The Vogel Equation
  • The Method of Fetkovich
    • Assumptions and Analysis Procedure

Inflow Performance for Damaged Wells

  • Standing Study
  • Camacho and Raghavan Method

Future Performance Predictions

  • The Method of Fetkovich
  • The Klins and Clark Method

Stiles prediction method

Assumptions and Analysis Procedure

Water influx effects

Summary of efforts


Location Start Date End Date Cost Trainer Book
Upon request       Professor Emeritus Steven Poston Make enquiry

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