# Petroleum Production Operations Questions and Answers – Workover to Reduce Water Production in Oil and Gas Wells

This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Workover to Reduce Water Production in Oil and Gas Wells”.

1. Consider a formation with the pressure of 6,220 psi at a True vertical depth of 10,000 ft. If thermal expansion is there due to the heat from the well, what should be the weight of the brine is needed to balance the formation pressure?
a) Less than 12 ppg
b) More than 12 ppg
c) 12 ppg
d) 9 ppg

Explanation: We know hydrostatic pressure=0.052.(density).(True vertical depth)=> Mud weight=6220/((0.052). (10000)) = 12 ppg, if thermal expansion is there then there will be a decrease in mud weight due to the heat from the well and hence more than 12 ppg of mud weight is required.

2. After killing the well by bullheading, what should be done to hold constant pressure on the formation while forward circulating is being done to displace the annulus with kill weight mud?
a) Hold tubing pressure constant while circulating
b) Hold casing pressure constant while circulating
c) Hole casing pressure constant until one tubing volume is reached and then hold tubing pressure constant
d) Start reverse circulation

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 pressure inside the tubing has to make constant while the circulation is taking place.

3. Which of the following is correct regarding Potassium Carbonate used in hydraulic fracturing?
a) Adjusts the pH of fluid
b) Known as gelation chemicals
c) Used to lower the surface tension
d) Used to limit the growth of microbes

Explanation: Potassium Carbonate can adjust the pH of the fluid under consideration in order to maintain the effectiveness of other components, the other component can be crosslinkers. Potassium Carbonate (K2CO3) is an inorganic compound.

4. Coiled tubing is sometimes used for sand washing.
a) True
b) False

Explanation: The statement is true. Coiled tubing is sometimes used for sand washing. Coiled tubing is spooled on a reel which can be reeled off at the time of well interventions in the oil and gas wells. It is used for sand washing or injection purposes.

5. Any changes in pressure and temperature can unseat a packer used in well completions.
a) True
b) False

Explanation: The statement is true. Changes in pressure and temperature can unseat a packer if the packer is not properly seated in the casing wall. With changes in pressure and temperature expansion or compression takes place and if this happens then the elastomers or rubber element may unseat from its place.

Sanfoundry Global Education & Learning Series – Petroleum Production Operations.

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