Final Exam Review

Question 1

A well is drilled in a consolidated sandstone reservoir. The wellbore is believed to be stable and there is no concern about excessive water production. The most economical completion type is _____.

Answer 1

open hole

Question 2

A well is drilled in a limestone reservoir. Resistivity logs reveal there are intervals of high water saturation throughout the producing interval that need to be avoided. The best completion type for this well is _____.

Answer 2

cemented and perforated casing

Question 3

If Swc = Swirr in a reservoir penetrated by a particular well, and in the absence of any hydraulic connection to an aquifer, the producing water cut will be _____.

Answer 3

zero

Question 4

A producing oil well makes 80 BOPD and 20 BWPD. The producing water cut and corresponding WOR, respectively, are _____.

Answer 4

20%, 0.25 BW/BO

Question 5

A production well producing from a reservoir under waterflood has a 99% water cut and a GOR of 50scf/STB. The best representation of reservoir inflow performance will be _____.

Answer 5

straight line

Question 6

A production well produces from a reservoir with an average reservoir pressure of 5000psi. The bottomhole flowing pressure is 3000psi. The oil bubble point pressure is 4250psi. The best representation of reservoir inflow performance will be _____.

Answer 6

generalized vogel

Question 7

The Vogel method is employed to predict the reservoir inflow rate for a well that has a significant, positive skin factor. The inflow rate predicted by the Vogel method in this case would be _____.

Answer 7

erroneously high

Question 8

During normal primary production operations, how will a well’s future productivity index typically compare to its present productivity index?

Answer 8

less than or the same

Question 9

What is most important when assessing the potential performance of a horizontal well over a vertical well?

Answer 9

vertical permeability and geometry of the drainage area

Question 10

Which type of flow will tend to result in the LEAST change in pressure over the length of the flow path

Answer 10

slug flow

Question 11

T or F: if the tubing head pressure in a production well experiencing two-phase flow is decreased by 10%, the bottomhole flowing pressure will also always decrease by exactly 10%.

Answer 11

False

Question 12

If the size of the wellhead choke is increased, the THP is expected to _____ and the surface flow rate is expected to _____.

Answer 12

decrease, increase

Question 13

Artificial lift techniques are designed to overcome the pressure loss in the production tubing string. This may be accomplished by

Answer 13

lightening the produced fluid column and adding pressure to supplement pwf

Question 14

What artificial lift method is preferred for producing a high volume, high water cut, low GLR oil production well?

Answer 14

electric submersible pump

Question 15

What artificial lift method is preferred for producing a high volume, high water cut, low GLR oil production well?

Answer 15

electric submersible pump

Question 16

What artificial lift method is commonly employed to periodically remove a small volume of liquid from a gas well?

Answer 16

plunger lift

Question 17

In a continuous gas lift oil production well, the average produced fluid pressure gradient about the operating valve is influenced by

Answer 17

the combination of supplemental gas injection and natural formation gas

Question 18

What type of plunger is recommended for use in a well with deviations in the internal diameter f the tubing string?

Answer 18

pad-plunger

Question 19

What type of plunger is ideal for removing sand from the inside walls of the tubing string?

Answer 19

brush-plunger

Question 20

The Foss and Gaul Method for plunger lift design accounts for _____, _____, and _____.

Answer 20

required pressures, gas required per plunger cycle, maximum number of plunger trips possible per day

Question 21

An electrical submersible pump is design to maintain: a) a constant production rate, b) a constant amount of output measured in feet of head

Answer 21

b) a constant amount of output measured in feet of head

Question 22

In the operation of an electrical submersible pump, the _____ adds kinetic energy to fluid by accelerating it while the _____ converts part of the added kinetic energy to fluid pressure by slowing accelerated fluid.

Answer 22

impeller, diffuser

Question 23

The vertical lift component of the total dynamic head calculated to size an electrical submersible pump is measured from the _____.

Answer 23

working fluid level

Question 24

What artificial lift method is preferred for producing wells with low productivity indexes?

Answer 24

sucker rod pumping

Question 25

List three changes that can be made to alter the pumping capacity of a sucker rod pumping system.

Answer 25

Stroke length, pump rate, and plunger diameter

Question 26

In a sucker rod pumping system, what is the main factor limiting the pumping depth that can be achieved?

Answer 26

tensile strength of the rods

Question 27

What is the valve action during the upstroke of a pumping cycle?

Answer 27

The traveling valve (TV) is closed and the standing valve (SV) is open

Question 28

What device is employed in a sucker rod pumping system to minimize tubing stretch?

Answer 28

a tubing anchor

Question 29

The most cost effective way to achieve downhole gas separation in a sucker rod pumping system is to simply place the pump where?

Answer 29

below the perfs

Question 30

What is the tapered string API designation for a sucker rod pumping string composed of 3/4in - 5/8in - 1/2in rods?

Answer 30

64

Question 31

What failure mode accounts for 99% of all sucker rod string failures?

Answer 31

fatigue

Question 32

What is the maximum polished rod load a C160D-173-64 pumping unit can tolerate?

Answer 32

17.300lbs

Question 33

At typical pumping speeds, use of the surface stroke length in design calculations will typically lead to overestimating or underestimating the pump displacement?

Answer 33

overestimating

Question 34

At typical pumping speeds, use of the surface stroke length in design calculations will typically lead to overestimating or underestimating the pump displacement?

Answer 34

overestimating

Question 35

The polished rod horsepower (PRHP) of a sucker rod pumping system is equivalent to what feature of a surface dynamometer card?

Answer 35

the area

Question 36

_____ results from incomplete sucker rod pump working barrel fillage during the upstroke portion of the pumping cycle.

Answer 36

Liquid pound

Question 37

_____ results from gas completely filling the sucker rod pump working barrel resulting in no surface liquid production.

Answer 37

Gas lock