This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on ” Workover to Sand Control”.
1. Wellbore influx is easier to detect in oil-based mud as compared to water-based mud.
a) True
b) False
View Answer
Explanation: The statement is false. The corrected statement is that it is very difficult to detect the influx if there exists oil-based mud as gases are soluble in oil-based mud. Oil-based mud is used in water-sensitive shales.
2. An oil well is having a true vertical depth of 10000 ft and measured depth of 12000 ft. the tubing shut-in pressure is 500 psi and the weight of the fluid in the tubing is 4 ppg. Calculate the formation gradient in psi/ft of the well?
a) 0.354
b) 0.454
c) 0.2
d) 0.258
View Answer
Explanation: Formation pressure can be calculated by adding the hydrostatic pressure with the surface pressure. Therefore, Formation pressure is 500 + Hydrostatic pressure = 500 +( 0.052).(4).(10000) = 2580 psi and pressure gradient is formation pressure/TVD = 2580/10000 = 0.258 psi/ft.
3. What is the main function of the subsurface safety valve?
a) Always Controls production rate
b) Shut the well in case of emergency
c) Shut the well in before removing wireline lubricator
d) Allows the formation of fluid influx
View Answer
Explanation: Subsurface safety valves are the type of valves used at the time of emergency to control the fluid flow. The function of this valve is to stop the flow of the fluid if there is any type of failure in the surface facilities.
4. Calculate the kill weight required to kill the well where the shut-in tubing pressure is 4500 psi, top of perforation is 12000 Measured depth/ 10000 True vertical depth and the formation fluid density is 2 ppg?
a) 10.5 ppg
b) 10.7 ppg
c) 10.9 ppg
d) Component-based
View Answer
Explanation: The kill weight of fluid can be calculated by using the formula kill weight fluid = formation fluid density + hydrostatic density = 2 + 4500/ ((0.052).(10000)) = 10.7 ppg. This is the required weight of the kill fluid required to kill the well.
5. Consider a well in which the annulus is full of 11.5 ppg fluid and the tubing is full of 7 ppg fluid. What should be done to reverse circulate the well with 11.5 ppg while maintaining the bottom hole pressure constant?
a) Hold tubing pressure constant while circulating
b) Hold the pressure inside the packer constant
c) Hold casing pressure constant while reverse circulate
d) Hole casing pressure constant until one tubing volume is reached and then hold tubing pressure constant
View Answer
Explanation: The pressure needs to be held constant on the side where the fluid is constant. It is recommended by Driller’s method. So the casing pressure should be maintained constant while the circulation is taking place.
Sanfoundry Global Education & Learning Series – Petroleum Production Operations.
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