How to Interpret Multi-Well Pressure VS Depth Plots and Pressure Maps from DSTs and Wire-Line Formation Test Data Including Hydrodynamics
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How to Interpret Multi-Well Pressure VS Depth Plots and Pressure Maps from DSTs and Wire-Line Formation Test Data Including Hydrodynamics Course
Introduction:
This 5 day intensive training course will show participants how to use pressure data from DST’s, Wire-line Tests (such as RFT’s & MDT’s) & production Tests ( from many different wells) to make Pressure/Depth Plots which reveal permeability barriers such as pinch-outs, sealing faults & any barrier which can trap hydrocarbons. It will also examine how pressures can be used to help correlations between wells & determine if sands are separate or connected. Also covered is how to find fluid contacts from limited single hydrocarbon pressure points by independently finding the fluid gradients from lab fluid analyses & correcting to subsurface conditions.
Course Objectives:
Six class projects give hands-on experience.
- Students practice skills using data before each pool was discovered & then assess how big the pool is using the discovery well pressure data.
- arriers such as pinch-outs, sealing faults & any barrier which can trap hydrocarbons.
- It will also examine how pressures can be used to help correlations between wells & determine if sands are separate or connected.
- Also covered is how to find fluid contacts from limited single hydrocarbon pressure points by independently finding the fluid gradients from lab fluid analyses & correcting to subsurface conditions.
Who Should Attend?
Production & Development Geologists, Engineers, Petro-physicists & operations people working to extend existing fields. This course will also benefit exploration geologists who are involved in looking for permeability barriers & subtle traps missed by others in well drilled basins where most of the structural traps have already been found using seismic but stratigraphic traps are still not all discovered.
Course Outlines:
Introduction and history of use of pressure data in exploration
- Sources of pressure and salinity data: DST’s – Drillstem Tests, Production Tests, RFT’s – Wireline Tests
- Screening the data
- How to obtain valid stable pressures from the data
- How to distinguish mud filtrate from true formation water
- How to determine correct subsurface fluid gradients
- Using pressure/depth graphs to correlate reservoirs (Are zones continuous or separate?)
- How to predict gas/oil/water contacts downdip from new discovery wells
- How to make potentiometric surface and pressure maps
- How to find permeability barriers (stratigraphic) traps from pressure drops in the reservoir
- Identifying areas of updip and downdip flow
- Tilted oil/water contacts
- Capillary pressures
- Identifying ‘flushed’ areas
- Hydrodynamic traps (accumulations without any apparent seal)
- Causes of pressure anomalies – underpressure and geopressure
- Using chemical water analysis to correlate zones – Stiff diagrams
- Modern concepts – pressure compartments
