Petroleum Production Operations Questions and Answers – Workover to Multicomplete

This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Workover to Multicomplete”.

1. If gas migrates to the surface by using the volumetric method, what should be the next step?
a) Bleed gas and pump mud as per calculation
b) Pump mud and bleed gas as per calculation
c) Bleed off the gas and flow check
d) Bleed off as continuously
View Answer

Answer: b
Explanation: Mud has to be pumped down the well and then gas should be bleed as per calculation. The time when the gas reaches up to the surface of the well, mud has to be pumped. This method is known as lubricate and bleed.

2. Which production tree valve should not be operated in normal operations?
a) Swab valve
b) Upper master valve
c) Lower master valve
d) Wing valve
View Answer

Answer: c
Explanation: There are two types of master valves present in the Christmas tree. The lower master valve is generally used as a backup at the time when the upper master valve stopped working when there exists any type of leakage.

3. The subsurface safety valve is recently tested and the result is good. Personnel can just only shut the well in using a subsurface safety valve without installing a back pressure valve and then remove the x-mas tree.
a) True
b) False
View Answer

Answer: b
Explanation: The statement is false. A subsurface safety valve is installed on the upper side of the well. It is used in any type of dangerous situation when it is compulsory to stop the flow of the fluid at the time of emergency.
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4. 15 bbl/hr of partial losses are recorded and there is no tubing in the well. If personnel fails to keep the hole full for 5 hours, what is bottom hole pressure reduction after 5 hours if the casing capacity is 0.035 bbl/ft and the current mud weight is 9.2 ppg?
a) 950 psi
b) 1025 psi
c) 1255 psi
d) 550 psi
View Answer

Answer: b
Explanation: Total losses in the volume in five hours can be calculated by multiplying the partial losses with total time i.e. 15 × 5 = 75 bbl. The height of the 75 bbl of losses of mud can be calculated by dividing loss in volume/casing capacity = 75/0.035 ft = 2143 ft. Therefore, the hydrostatic loss = 0.052 ×2143 ×9.2 =1025 psi.

5. What is the objective of the volumetric well control?
a) Maintain bottom hole pressure constant and allow gas to migrate to the surface
b) Maintain influx pressure constant
c) Maintain shoe pressure constant
d) To release the packer
View Answer

Answer: a
Explanation: The volumetric well control is used in the workover i.e. any type of well interventions and also in production wells. In this method, the pressure in the bottom hole is maintained constant while allowing gas to flow to the surface.
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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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