# Petroleum Production Operations Questions and Answers – Sand Control – Use of Screen without Gravel

This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Sand Control – Use of Screen without Gravel”.

1. Using a slotted liner or screen without gravel is always recommended.
a) True
b) False

Explanation: The statement is false. The corrected statement is using a slotted liner or screen without gravel is not always recommended. Unless formation is well sorted, clean sand with a large grain size this method is not recommended.

2. Which of the following is correct in the context of gravel – sand size ratio when the uniformity coefficient is less than 5; consider flow velocity is less than 0.05 ft/sec?
a) D10 gravel = 7 times D10 sand size
b) D10 gravel = 8 times D10 sand size
c) D10 gravel = 6 times D10 sand size
d) D10 gravel = 4 times D10 sand size

Explanation: When the flow velocity is less than 0.05 ft/sec then in the context of gravel-sand size ratio the correct relation is D10 gravel =6 times D10 sand size. A uniformity coefficient is determined by comparing the 40 percentile with 90 percentile.

3. Which of the following is correct in the context of gravel – sand size ratio when the uniformity coefficient is greater than 5; consider flow velocity is less than 0.05 ft/sec?
a) D10 gravel = 7 times D10 sand size
b) D40 gravel = 8 times D40 sand size
c) D10 gravel = 8 times D40 sand size
d) D40 gravel = 6 times 40 sand size

Explanation: When the flow velocity is greater than 0.05 ft/sec then in the context of gravel-sand size ratio the correct relation is D40 gravel =6 times D40 sand size. A uniformity coefficient is determined by comparing the 40 percentile with 90 percentile.

4. How the flow velocity is calculated in the context of gravel packing?
a) Production rate ft3/sec / 50% of the open area of slots 50%
b) Production rate ft3/sec / 100% of the open area of slots 50%
c) Production rate ft3/sec / 60% of the open area of slots 50%
d) Production rate ft3/sec / 80% of the open area of slots 50%

Explanation: In the gravel-pack designing, the flow velocity is calculated by dividing the Production rate ft3/sec by50% of the open area of slots 50%.Mathematically, Flow velocity =Production rate ft3/sec / 50% of the open area of slots 50%.

5. Viscosity builders have to be used in a huge amount in gravel packing.
a) True
b) False

Explanation: The statement is false. The corrected statement is Viscosity builders have to be used in a minimal amount in gravel packing. Fluid loss control and viscosity builders cause plugging operation but if required they should be used under controlled manner.
Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!

Sanfoundry Global Education & Learning Series – Petroleum Production Operations.

To practice all areas of Petroleum Production Operations, here is complete set of 1000+ Multiple Choice Questions and Answers.