CWD Technology & Digital Tools 3 — Questions and Answers
Question 1: What is the primary function of SCADA systems when applied to water well operations?
- Generate well completion reports automatically
- Remotely monitor and control pump systems, water levels, and alarms (Correct answer)
- Perform geophysical logging of the aquifer
- Design grout programs for new well installations
Correct answer: Remotely monitor and control pump systems, water levels, and alarms
SCADA (Supervisory Control and Data Acquisition) systems allow operators to remotely monitor pump status, water levels, flow rates, and receive automated alarms from well sites.
Question 2: An electromagnetic (EM) induction log is preferred over a standard resistivity log in a borehole because it:
- Measures formation temperature more accurately
- Can operate in air-filled or non-conductive fluid-filled boreholes (Correct answer)
- Provides a visual image of the borehole wall
- Only functions in cased sections of the well
Correct answer: Can operate in air-filled or non-conductive fluid-filled boreholes
EM induction logs use induced electromagnetic fields and do not require a conductive fluid in the borehole, making them ideal for air-drilled or freshwater boreholes.
Question 3: A well driller uses a cone penetration test (CPT) data file imported into well design software. What does CPT data primarily help evaluate?
- Chemical composition of groundwater
- Soil stratigraphy, strength, and aquifer location before drilling (Correct answer)
- Pump curve selection for the final well
- Grout volume calculations for surface casing
Correct answer: Soil stratigraphy, strength, and aquifer location before drilling
CPT data provides continuous soil classification and strength measurements that help drillers identify aquifer zones and design well construction before the borehole is started.
Question 4: Which digital tool is used to remotely assess the corrosion condition of steel well casing without pulling the pipe?
- Spontaneous potential log
- Electromagnetic pipe inspection log (flux leakage or eddy current) (Correct answer)
- Caliper log
- Resistivity log
Correct answer: Electromagnetic pipe inspection log (flux leakage or eddy current)
Electromagnetic pipe inspection tools detect wall thickness loss, pits, and perforations in steel casing by measuring magnetic flux leakage or eddy current response.
Question 5: In the context of digital well records management, what is the benefit of using a cloud-based document management system for well completion reports?
- It eliminates state regulatory filing requirements
- It allows multiple users to access, search, and update records from any location (Correct answer)
- It automatically submits reports to the EPA
- It replaces the need for field-collected lithology data
Correct answer: It allows multiple users to access, search, and update records from any location
Cloud-based document management enables real-time access, version control, and collaboration on well records from any location with internet connectivity.
Question 6: A driller monitors weight-on-bit (WOB) using a digital hookload indicator. If WOB suddenly drops to zero while drilling, the most likely cause is:
- The drill bit has entered a softer formation
- The drill string has become stuck or the bit has broken off (Correct answer)
- A full drilling mud bucket has been triggered
- Formation water has entered the borehole
Correct answer: The drill string has become stuck or the bit has broken off
A sudden loss of WOB while rotating typically indicates the bit is off-bottom due to the string being stuck above it, or a bit has separated from the drill collar.
Question 7: What is the purpose of running a borehole flowmeter (spinner log) in a completed well?
- To measure the depth to the static water level
- To identify which zones are contributing flow and their relative yields (Correct answer)
- To determine the pH of formation water at each depth
- To cement perforations in casing
Correct answer: To identify which zones are contributing flow and their relative yields
A flowmeter spinner log measures fluid velocity at different depths during pumping to identify productive zones and quantify each zone's contribution to total well yield.
CWD Technology & Digital Tools 3
What is the primary function of SCADA systems when applied to water well operations?