Reservoir Analysis - Field Study Workshop
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
Problems
- Pressure drop profile
- Saturation profiles
Reservoir pressures and volumes
Measuring Bottomhole Pressures
Datum Pressures
Well Connectivity
Reservoir Volumes and Reserves
Isopach Maps
Problem
- Calculate Original Oil and Gas In Place
Decline curves
Arps Curves
Problems
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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