Modular density tool
Download as PPT, PDF0 likes535 views
The MDT (Modular Density Tool) is used to test formation pressure, temperature, and obtain fluid and water samples. It contains formation pressure and resistivity gauges, a pump out system, live fluid analyzer, sample chamber, and crystal quartz gauge. When using the MDT, points are selected for measuring formation pressure in oil, gas, and water zones. Interpretation of MDT data involves plotting a graph of formation pressure versus depth to identify contacts between gas, oil, and water zones based on their different density values.
Modular density tool
- 3. MDT:- MDT is the tool through which we can test the formation and measure the formation pressure, temperature and get the pure reservoir fluid and water samples. MAIN COMPONENTS OF AN MDT TOOL :- Formation Pressure Gauges Formation Resistivity Gauges Pump Out Live Fluid Analyzer Sample Chamber
- 5. There are few main points which should be keep in mind before Using the MDT. 1- Select the depth points for formation pressure. 2- Select at least three (3) pressure points in one bed. 3-Pressure points should fall in oil/gas zones and water bearing zone. 4- Select the oil/gas sample point, which should be clean and try to get it from top of the reservoir. 5-Also select a point for water sample in water bearing zone.
- 6. MDT Operation:- MDT operation you should consider the points which are given below:- 1- MDT Gauges should be calibrated. 2- Check the tool zero position. 3- MDT packer should be set correctly. 4- Formation pressure should be less than mud pressure. 5- Don’t stay longer at any point. 6- Take care before taking the formation sample.
- 7. MDT INTERPRETATION:- For interpretation you have to make a graph between the formation pressure and depth. • When you plot the formation pressure against the depth you will get the density values of which are given as under: Oil, Gas and Water has different values. 1-Gas = 0.55 g/cc 2-Oil = 0.88 g/cc 3-Water = 1.0 g/cc • These are density values of different fluids. Where your gradient changes you can mark the Gas-Oil contact, Gas-Water contact, Oil-Water contact. • In low permeable carbonates dual packer MDT is useful.
- 8. Interpretation Services for MDT Well site Formation pressure Down hole fluid analysis: fluid color and composition analysis, viscosity, density, florescence, resistivity, and pH Hydrocarbon composition (C1, C2, C3–C5, and C6) Gas/oil ratio (GOR) Standard Interpretation Grading of pressure Excess pressure analysis Advanced Interpretation Multi-well pressure analysis
- 9. Diagram of MDT tool (center), with photographs showing dual packer module (left) and single probe module (right).
- 10. THANKS!!!