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26. Well logging is…
a) is a cutting process that uses a drill bit to cut or enlarge a hole of
circular cross-section in solid materials.
b) is the practice of making a detailed record of the geologic
formations penetrated by a borehole.
c) is commonly used for creating larger diameter holes (up to 915 mm (36.0 in))
where a standard drill bit is not feasible or economical.
d) no correct answer.

27. A drill stem test (DST) is…
a) a procedure for isolating and testing the pressure, permeability and productive
capacity of a geological formation during the drilling of a well.
b) the practice of making a detailed record of the geologic formations penetrated
by a borehole.
c) a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-
section in solid materials.
d) no correct answer.

28. Methods of formation evaluation include examining cuttings and drilling mud,
well logging, drill stem testing, and coring.
a) Well logging, coring;
b) Examining cuttings and drilling mud;
c) examining cuttings and drilling mud, well logging, drill stem testing, and
coring;
d) no correct answer.

29. Logging while drilling (LWD) is…
a) the practice of making a detailed record of the geologic formations penetrated
by a borehole;
b) is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-
section in solid materials;
c) a technique of conveying well logging tools into the well borehole downhole as
part of the bottom hole assembly (BHA);
d) no correct answer.

30. Measurement While Drilling (MWD) is
a) is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-
section in solid materials;
b) a measurement taken of the wellbore (the hole) inclination from vertical, and
also magnetic direction from north. Using basic trigonometry, a three-dimensional
plot of the path of the well can be produced;
c) the practice of making a detailed record of the geologic formations penetrated
by a borehole;
d) no correct answer.

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