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c) very similar;
d) opposite.

30. Fluid flow behind the casing is … because contamination can occur.
a) not desirable;
b) preferable;

c) compulsory;
d) forbidden.

Unit 10
Special drilling operations

Answer the following questions.

1. What is the difference between horizontal and directional drilling?
2. What is fishing?
3. What does crew use to drill directionally?
4. What is MWD?
5. What fishing tools do you know?
6. Does a kick, if not recognized and properly handled, lead to a blowout?
7. Describe the procedures what crew members do when they discover a kick.
8. How is a series of valves, which are used to facilitate circulating a kick, called?

Choose the correct answer.
1. What is directional drilling?
a) Intentionally drilling the hole vertically
b) intentionally drilling the hole off-vertical
c) drilling the hole without knowing its direction
d) drilling the hole with special directional rig

2. What is fishing?
a) The operation crew members implement to retrieve an object in the wellbore
that doesn't belong there and impedes drilling
b) The operation crew members implement to kill the well
c) The operation crew members implement to find oil reservoirs
d) No correct answer

3. Well control is…
a) intentionally drilling the hole off-vertical for various reasons;
b) operation crew members implement to retrieve an object in the wellbore that
doesn't belong there and impedes drilling;
c) the techniques crew members use to regain control of the well should
formation fluids inadvertently enter the well;
d) no correct answer.
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