This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on ” Completion Equipment – Packers “.
1. Production packers are generally classified as Retrievable and Permanent Packers.
a) True
b) False
View Answer
Explanation: Yes, Production packers are generally classified as Retrievable and Permanent Packers. Permanent packers can be removed from the wellbore by a milling operation. Retrievable Packers are used for Low Pressure and Low-Temperature purposes.
2. Which of the following is true for the sealing action of packers?
a) The sealing stress should be equal to the differential pressure
b) The differential pressure must exceed the sealing stress
c) The sealing stress must exceed the differential pressure
d) Sealing stress and differential pressure are independent and don’t care about whether which is more
View Answer
Explanation: For the sealing to happen for packers the sealing stress must exceed the differential pressure. The differential pressure is the difference in the pressures between the reservoir pressure and the average reservoir pressure.
3. Packers are used in some artificial lift techniques.
a) True
b) False
View Answer
Explanation: Yes, this statement is true. Packers are used in some artificial lift techniques. Artificial lift techniques are those techniques used to take out the well fluid to the surface when the self flow of the well ceases.
4. Which of the following is not a purpose of a production packer?
a) Protection of casing from pressure
b) Isolation of casing leaks
c) To hold kill fluids
d) To measure the pressure
View Answer
Explanation: The purpose of the production packers are: Protection of the casing from pressure, Isolation of casing leaks, To hold kill fluids, Elimination of insufficient heading or surging. To measure the pressure gauges are run down to the bottom hole.
5. What is the temperature up to which Teflon resists H2S or other chemical attacks?
a) 550°F
b) 150°F
c) 450°F
d) 550°F
View Answer
Explanation: Teflon can resist H2S or other chemical attacks up to 450°F temperature. But extrusion can be a major problem in this. Extrusion is a compression process in which work metal is forced to flow through a die opening and thus its shape changes.
6. What is the procedure to remove the permanent packer?
a) Annular pressure release
b) Fishing operation
c) High differential pressure technique
d) Stress release
View Answer
Explanation: The permanent packer can be removed by the Milling operation only. So once used permanent packers can’t be used for the next time. So, a fishing operation is needed to remove the permanent packers from a well.
7. Which of the packers can be used for Through Tubing operations?
a) Packers with an external radius equal to the tubing radius
b) Packers with an external diameter equal to the tubing diameter
c) Packers with an internal diameter greater the tubing diameter
d) Packers with an internal diameter equal to the tubing diameter
View Answer
Explanation: Packers with an internal diameter equal to the tubing diameter can be used for Through Tubing operations. Where Through Tubing Operations are anticipated tubing should be set in such a way that the buckling effect can be minimized.
8. In which of the following case using of Tension set packers are favorable?
a) For shallow depth
b) For deep wells
c) For Ultradeep wells
d) In between shallow and deep wells
View Answer
Explanation: In general for shallow depth the Tension set packers are favorable. Because for shallow depth less number of tubings are run down so it will have lesser axial load and hence weight set packers can’t be used, hence Tension set packers are used for this purpose.
9. Which of the following plays a major role in the setting of a Mechanical set Packer?
a) Yield stress of the tubing
b) The tension of the string
c) Tubing rotation
d) Weight of the tubing
View Answer
Explanation: Tubing rotation plays an important role in the setting and retrieval of mechanical set packers where the annulus pressure above the packer is always greater than the tubing pressure below the packer.
10. What is the function of the “J” slot of the Weight Set Packer?
a) Permits the rotation of the tubing
b) Permits the horizontal movement of the tubing
c) Permits the vertical movement of the tubing
d) Permits the circulation of the fluid inside the tubing
View Answer
Explanation: The function of the “J” slot of the Weight Set Packer is to permit the vertical movement of the tubing. Weight Set Packer is ideally used for low-pressure application for well under consideration.
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