This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Field Examples of Production Logging Techniques”.
1. What does the high capture cross-section signifies?
a) Water Bearing Formation
b) Oil Bearing Formation
c) Gas Bearing Formation
d) Hydrocarbon Bearing Formation
View Answer
Explanation: The high capture cross-section signifies a Water Bearing Formation. This capture cross-section is a term used in Pulsed Neutron Logging tool. The formula to use this capture cross-section is 4550 divided by Time Constant.
2. What does it signifies, if the Far count is more than the near count in case of Pulsed Neutron Logging tool?
a) Shale
b) Water
c) Oil
d) Gas
View Answer
Explanation: If the Far count is more than the near count in case of Pulsed Neutron Logging tool, then it signifies the Gas bearing formation. Because if Gas is there then there will be less hydrogen and the neutrons will not lose their energies easily or near the source they have to travel a long way to loose their energy and finally get detected on the Far Count detector.
3. What does it signifies, if the Far count is less than the near count in case of Pulsed Neutron Logging tool?
a) Water
b) Shale
c) Oil
d) Gas
View Answer
Explanation: If the Far count is less than the near count in case of Pulsed Neutron Logging tool then it signifies Shale. Because Shale has boron contained within it so boron has larger cross-section to loose the energy of the neutrons and finally get detected at the near detector.
4. If the Far count is equal to the Near detector then it implies the 0% Water.
a) True
b) False
View Answer
Explanation: The statement is False. The corrected statement is the if the Far count is equal to the Near detector then it implies the 100% Water. That is the water saturation of the formation in the zone under investigation is 1.
5. What are the 3 parameters are used in the calculation of the C/O log?
a) Formation Fluid, brine water, borehole
b) Formation Fluid, Drilling fluid, borehole
c) Formation Fluid, matrix, borehole
d) Water, matrix, borehole
View Answer
Explanation: The three parameters that are used in the calculation of the C/O log are the Formation Fluid, matrix, borehole. If the C/O ratio increases then the saturation of oil is also increased and if it decreases then the water saturation increases.
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