This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Squeeze Cementing – Theoretical Considerations”.
1. Sedimentary rocks are inherently a high tensile strength material.
a) True
b) False
View Answer
Explanation: The statement is false. The corrected statement is Sedimentary rocks are inherently a low tensile strength material. They are primarily held together by the overburden weights or compressive forces of the overlying formations.
2. What is the range of the API Filter Loss of neat cement in 30 minutes?
a) 610 to 2470cc
b) 160 to 250cc
c) 600 to 2500cc
d) 60 to 250cc
View Answer
Explanation: The range of the API Filter Loss of neat cement in 30 minutes is 600 to 2500cc. But dehydration is too fast and it is very difficult to measure. So, the filtration loss has to be minimized to values of 25 to 100 cc.
3. How can the filtration loss be reduced to lower values?
a) By adding Bentonite
b) By adding more water
c) By adding cement
d) By releasing packers
View Answer
Explanation: The filtration loss can be reduced to lower values by adding Bentonite or dispersing agents. The filtration loss can also be reduced to lower values by adding polymers too. The fluid invasion has to be minimal otherwise it will damage the formation.
4. Which of the following is correct regarding the theoretical considerations of cement dehydration?
a) The thickness of the filter cake doesn’t depend on the permeability
b) The filtration loss can be reduced to lower values by adding non- dispersing agents
c) The differential pressure applied to the slurry affects the rate of building of the filter cake
d) The differential pressure affects the permeability of the filter cake
View Answer
Explanation: The correct statement among the sentences is the differential pressure applied to the slurry affects the rate of building of the filter cake. The other corrected statements are the thickness of the filter cake depends on permeability; the filtration loss can be reduced to lower values by adding dispersing agents, bentonite and other polymers. The differential pressure affects the permeability of the filter cake.
5. When sufficient hydraulic pressure is applied through the wellbore against a formation, it fractures along a plane __________ to the direction of least compressive stress.
a) Parallel
b) Perpendicular
c) Random direction
d) 60°
View Answer
Explanation: When sufficient hydraulic pressure is applied through the wellbore against a formation, it fractures along a plane perpendicular to the direction of the least compressive stress. In most of the cases, the plane is vertical.
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