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WorksheetsSPWLA Workshop - Formation Testing
Total questions: 27
Worksheet time: 14mins
Name
Class
Date
1.
The analysis of the pressure gradient is most likely able to determine
a)
Gas Oil Ratio
b)
Continuous fluid column height
c)
Free water level/oil water contact
d)
Reservoir extent
e)
Geo-chemical composition
2.
A pretest labelled as "tight test" usually means
a)
A casing check when setting the probe against the casing shoe
b)
No real fluid movement into the tool flowline due to very low rock permeability
c)
A pretest with the flow volume less than 1 cc
d)
Wireline engineer has a busy schedule so he has to run the pretest very quickly
e)
Tool Storage effect is too large
3.
Pressure test supercharging effect is mainly caused by
a)
Mud circulation; overbalance; Tight Formation; leaky mudcake
b)
Pretest chamber too small; flowline volume too large
c)
Formation permeability too high; mudcake permeability too low
d)
Pretest flowing time too short
e)
Skin value too low
4.
What is a compositional pressure gradient
a)
Reservoir is compartmentalized
b)
Mud filtrates are miscible with formation fluids, causing a compositional change
c)
Mud filtrates are immiscible with formation fluids, causing a compositional change
d)
The presence of source gas in the reservoir
e)
Fluid compositions & properties vary along the column height
5.
What assumptions are made in the clean up analysis?
a)
Presence of Mud cake and formation fluid at the start of the pumping station
b)
The appearance of sour gas in the Optical fluid ID
c)
The sampling rate and resolution of the recorded channels
d)
The clean up starts at 100% filtrate and infinite pumping time will result in 0% contamination
e)
The contamination rate is a function of the resolution and the number of channels being used.
6.
What is the most likely cause for the marked differences in AMGL drilling fluid composition versus sampling composition in reservoir A (FSWD+AMGL Poster)?
a)
Wettability
b)
Capillary Pressure
c)
Relative Permeability
d)
Bubble Point
7.
Why does AMGL fluid ID differ in time from LWD Fluid ID? (FSWD+AMGL Poster)
a)
GCMS vs Optical Spectroscopy
b)
Mud Flow Rate
c)
Drilling ROP
d)
De-Water algorithm
8.
Fill in the quote from the Economist: "(blank) is the new oil!"
a)
Data
b)
Oil
c)
nanotech
d)
Solar power
9.
What formation property can not be obtained from a successful pre-test analysis?
a)
Formation Pressure
b)
Contamination estimate
c)
Mobility
d)
Hydrostatic pressure
10.
Generally, there is more invasion across high permeabilty formations compared to low permeability formations
a)
true
b)
false
11.
Sampling operation earlier after drilling helps in shortening the cleanup time due to
a)
Lesser invasion
b)
Faster rate
c)
Continuous circulation
d)
Optical sensor
12.
Based on the optical spectrum, which fluids can be identified
a)
Oil & Water
b)
Oil & Gas
c)
Gas & Water
d)
Oil,Gas & Water
13.
Fluorescence can be used to distinguish between
a)
Waters of different salinties
b)
Water & heavy oil
c)
Dry Gas & condensate
d)
Dry gas & water
14.
The speed of sound in water depends on
a)
Pressure & temperature
b)
Salinity
c)
Density
15.
When cleaning up from a low saline filtrate WBM to high saline formation water, the following measurement will decrease
a)
Density
b)
Sound Speed
c)
Sound Slowness
d)
Refractive Index
16.
The optical spectrum can distinguish between different types of waters based on
a)
Salinity
b)
Resistivity
c)
Density
d)
Cannot distiguish
17.
The main properties in the establishment of the productivity forecasting method are
a)
Resistivity & Mobility
b)
Gamma Ray & Porosity
c)
Acoustic & Mobility
d)
Porosity & Mobility
18.
Application of the productivity forecasting can be used
a)
for the replacement of all DST in the field
b)
for the feasibility of the DST
c)
to assign the wells as producers or injectors
d)
for the productivity of the flow units separately
19.
What parameters are important for the conversion of formation testing pre-test mobility to permeability
a)
viscosity
b)
viscosity and skin
c)
viscosity, skin, spherical flow regime and relative permeability
d)
relative permeability and viscosity
20.
Which criterion among the following is not used to qualify the pressure test
a)
Pretest Depth
b)
Pressure Stability
c)
Temperature Stability
d)
Supercharging
21.
The pressure gradient is calculated based on two main variables:
a)
Mobility and Pressure
b)
Depth and Mobility
c)
Depth and Temperature
d)
Depth and Pressure
22.
The OBM contamination calculation method which requires knowledge of the mud composition is
a)
Skimming Method
b)
Curve-fitting method
c)
Direct Subtraction Method
d)
SGS GC-GOR method
23.
What temperature should be used to restore the subsurface sample?
a)
Separator temperature
b)
Reservoir temperature
c)
Ambient temperature
d)
60 °F
24.
Which fraction usually contains oil-based mud after the subsurface sample is depressurized to ambient pressure?
a)
Oil fraction
b)
Gas fraction
c)
Water fraction
d)
All of the three
25.
What OBM contamination levels are usually considered acceptable?
a)
< 1 wt%
b)
< 5 wt%
c)
< 10 wt%
d)
<20 wt%
26.
What was the goal of the unconventional sampling?
a)
Fracture gradient
b)
All of the above
c)
IPIP
d)
Closure Pressure
e)
PVT Sample
27.
What proppant was used in the field test of the unconventional sampling?
a)
Water
b)
Filtered mud
c)
Nano Proppant
d)
High Viscosity
e)
None
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