The following self assessment test is to help you decide which course is best suited to you; foundation or advanced production logging interpretation.

1. A correctly designed Multirate PLT survey can yield the following: Three answers

Production profile Layer pressures Productivity Index Vertical permeability Porosity Water saturation

2. Before running the PL toolstring it is necessary to perform a drift/dummy run to PBTD to check the following? Two answers

Correct cable speeds attainable and satisfactory winch operation Sufficient depth to cover planned logging interval The lubricator can hold and control the tubing head pressure Clear passage through completion before running the PL string

3. Logging speeds are normally set at approximately: Two answers

4. Before you start an Emeraude PL interpretation you should: Four answers

Quality control and qualitatively interpret all raw PL data Gather fluid PVT properties Convert measured depths to TVD for true deviated gradio values Obtain surface rates and job chronology Convert the LAS to ASCII files Review the well/reservoir history Change cable speeds so that up passes have negative cable speeds

5. Where is cable speed used in Emeraude? Three answers

Spinner calibration Velocity (VAPP) calculation Choice of correlation Differential Pressure Gradio Tool Friction calculations Nuclear Density Tool Friction calculations Temperature Analysis

6. Spinner calibration thresholds are more significant in VAPP calculations at: One answer

High mixture velocities much greater than the spinner threshold values Low mixture velocities close to the spinner threshold velocity Both of the above conditions

7. Spinner calibration slopes are more significant in VAPP calculations at: One answer

High mixture velocities much greater than the spinner threshold values Low mixture velocities close to the spinner threshold velocity Both of the above conditions

8. What factors generally affect the spinner slope and threshold values? Two answers

Tool condition The average mixture fluid velocity (Vm) Phases present in the fluid mixture Wellbore temperature and pressure The cable speed Memory or real-time surface readout logging

9. What is VPCF (Velocity Profile Correction Factor) a function of? Five answers

Fluid density Fluid viscosity Zone Rates Model Reynolds number Zone Rates Correlation Spinner blade diameter Casing size

10. Which is approximately or completely true? Two answers

VAPP = Vm * 0.83 Vm < VAPP Vm = VPCF * 0.83 Vm = VAPP * VPCF

11. If you are given the spinner calibration threshold and response slope values, under which of the following conditions can you calculate a fluid velocity? Select YES or NO

YES

NO

All the up passes

A single cable speed, spinner sample

All the down passes

All up and down passes

Any single up or down pass

A spinner station reading, logged vs time

12. Which Temperature pass/passes are usually used for interpretation? One answer

Average down pass Average of all up and down passes. Slowest down pass (assuming good data quality) Temperature pass corresponding to a good spinner pass

13. Where are the PVT properties used in Emeraude? Three answers

Matching surface conditions Zone rates cumulative rates calculations Capacitance calibration Spinner threshold calibration Simulation of the nuclear or gradio density measurements

14. What best describes the “MODEL” used in the Zone Rates calculations? One answer

The fluid system at each calculation zone The completion design The PVT system composition describing the fluid properties The flow regime chosen for each calculation zone

15. Which of these CORRELATIONS take into account deviation? Four answers

Artep Dunns & Ross Aziz & Govier Petalas & Aziz Beggs & Brill ABB deviated Cte slippage

16. What do the “CORELLATIONS” used in the Zone Rates calculations provide towards the interpretation? Three answers

Describes the fluid PVT properties Assist in predicting the flow regimes Calculate the friction corrections for the nuclear density tool Predict the pressure drop according to the flow regimes Provide the slippage velocity used to solve the multiphase solution Calculate the Vm and VPCF from the VAPP Predict the non-linearity in the Yw measurement from the Capacitance data.

17. Does the interpreter’s choice of PVT affect the available selection of Models? One answer

No Yes Sometimes

18. In general which is correct? Four answers

A warming of the temperature profile indicates a flow from deeper in the well After the well has been shut in for 24 hours, the temperature profile represents the actual reservoir temperature, irregardless of the previous production or injection history A typical geothermal gradient is about 5degF/100ft (9degC/100m) The temperature is far more sensitive to fluid entries than the flowmeter It is normal to have an associated cooling with gas entries into the wellbore The temperature tool resolution can be as good as 0.01degF (0.006degC)

19. The colored lines shown in Area #1 represent one the following: One answer

The available flow Models The available Correlations The range of solutions for different PVT The mathematical incoherence in the calculated results

20. The vertical dashed line, arrow #2 represents one of the following: One answer

The total surface flowrate converted to downhole conditions. The calculated cumulative downhole rate at the red calculation zone The total downhole gas rate The total downhole oil rate

21. The horizontal DASHED line shown by arrow #3 represents one of the following: One answer

The deviation corrected calculated density The measured density response from PL toolstring The simulated matched density The pseudo density corrected for deviation