The correct answer is option (a) external pressure
What is external pressure?
- External pressure is the amount of energy that is applied from the outside.
- The external pressure of casing string includes mainly drilling and completion fluid pressure in sections with no cementing and the oil, gas, and water pressure of the reservoir.
- The status of external pressure borne by the casing string is complicated
- No smoking is a prohibition sign normally contains a no smoking symbol with a black cigarette and smoke in a crossed red prohibition circle.
Why other options are incorrect?
- Option (b), (c), (d) are incorrect because internal, media and peer pressure are not the topics related to the no smoking sign.
Learn more about signs below,
https://brainly.ph/question/6014215
#SPJ2
