This set of Petroleum Production Operations Multiple Choice Questions & Answers focuses on “Sand Control – Practical Considerations in Gravel Packing”.
1. If the uniformity coefficient is greater than 5 then what does it signifies?
a) Sand is uniform and is described by D10 size
b) Sand is non-uniform and is described by D40 size
c) Sand is very non- uniform and is described by D70 size
d) Sand is uniform and is described by D40 size
View Answer
Explanation: A uniformity coefficient is determined by comparing the 40 percentile with 90 percentile. When the uniformity coefficient is greater than 5 then it signifies Sand is non-uniform and is described by D40 size.
2. If the uniformity coefficient is greater than 10 then what does it signifies?
a) Sand is uniform and is described by D10 size
b) Sand is non-uniform and is described by D40 size
c) Sand is very non- uniform and is described by D70 size
d) Sand is uniform and is described by D40 size
View Answer
Explanation: The formula of the uniformity coefficient is C= D40/D90. If the uniformity coefficient is greater than 10 then it signifies that the sand is very non- uniform and is described by D70 size.
3. What is gravel-sand size Ratio according to Wagner, Gumpertz?
a) Largest gravel size/10 percentile sand size
b) 50 percentile gravel/ 50 percentile sand
c) 10 percentile gravel/ 10 percentile sand
d) Smallest gravel size/10 percentile sand size
View Answer
Explanation: Gravel-sand size Ratio according to Wagner, Gumpertz is the ratio of the largest gravel size to the 10 percentile sand size. Early work by Coberly in defining the gravel-sand size ratio considers only the problem of preventing movement of sand into the wellbore.
4. What is gravel-sand size Ratio according to Saucier?
a) Largest gravel size/10 percentile sand size
b) 50 percentile gravel/ 50 percentile sand
c) 10 percentile gravel/ 10 percentile sand
d) Smallest gravel size/10 percentile sand size
View Answer
Explanation: Gravel-sand size Ratio according to Saucier is the ratio of 50 percentile gravel size to the 50 percentile sand size. Early work by Coberly in defining the gravel-sand size ratio considers only the problem of preventing movement of sand into the wellbore.
5. What is gravel-sand size Ratio according to Schwartz?
a) Largest gravel size/10 percentile sand size
b) 50 percentile gravel/ 50 percentile sand
c) 40 percentile gravel/ 40 percentile sand
d) Smallest gravel size/10 percentile sand size
View Answer
Explanation: Gravel-sand size Ratio according to Schwartz is the ratio of 40 percentile gravel size to the 40 percentile sand size. Early work by Coberly in defining the gravel-sand size ratio considers only the problem of preventing movement of sand into the wellbore. Gravel-sand size Ratio according to Schwartz is also the ratio of 10 percentile gravel size to the 10 percentile sand size.
6. What is gravel-sand size Ratio according to Maly?
a) Largest gravel size/10 percentile sand size
b) 50 percentile gravel/ 50 percentile sand
c) 40 percentile gravel/ 40 percentile sand
d) Smallest gravel size/10 percentile sand size
View Answer
Explanation: Gravel-sand size Ratio according to Maly is the ratio of Smallest gravel size to the 10 percentile sand size. Early work by Coberly in defining the gravel-sand size ratio considers only the problem of preventing movement of sand into the wellbore.
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