This set of Petroleum Production Operations Quiz focuses on “Workover to Change Zones or Reservoirs”.
1. The workover to change zones is usually to squeeze cement and re-perforate in the new zone.
a) True
b) False
View Answer
Explanation: The statement is true. To change the zone of interest the cement plug can be used or the packer can be used to isolate any zones which are not the zone of interest. Re-perforation may be necessary in some cases followed by squeeze cementing.
2. Which of the following is incorrect regarding the remedial measures of workover in high viscosity wells?
a) Thermal stimulation
b) Steam stimulation
c) Reaming
d) Caliper log
View Answer
Explanation: The caliper log is used to check any kind of decrease in the internal diameter of the casing. If the well fluid is highly viscous then some of the Enhanced oil recovery methods can be used. For that heat energy can be used to lower the viscosity of the fluid.
3. Which of the following is not a method of paraffin control?
a) Steam injection into the annulus
b) Circulating hot oil periodically through the well
c) Wax injection
d) Heating the annulus through the downhole electric heater
View Answer
Explanation: Wax is not a method of paraffin control. For paraffin control, downhole heaters can be used. Hot oil can be circulated to lower the viscosity or to melt the wax or paraffin and some chemicals may be pushed down.
4. In an open hole, it may be necessary to deepen or plug back or to cement a liner in an open hole to selectively produce an effective zone.
a) True
b) False
View Answer
Explanation: The statement is true. In general, re perforating is done followed by squeeze cementing job. To change the zone of interest the cement plug can be used or the packer can be used to isolate any zones which are not the zone of interest.
5. Thermal stimulation is usually applicable in ____ viscosity oil reservoirs.
a) Low
b) High
c) 10 cp
d) 14 cp
View Answer
Explanation: Thermal stimulation jobs are usually applicable in high viscosity reservoirs. If the well fluid is highly viscous then some of the Enhanced oil recovery methods can be used. For that heat energy can be used to lower the viscosity of the fluid.
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