CWD Technology & Digital Tools 4

Question 1

A driller receives a digital print of a gamma-ray log. High gamma-ray counts (right deflection) most often indicate:

Accepted Answer

Shale, clay, or other radioactive-mineral-rich formations

Answer

Gamma-ray logs detect natural radioactivity; shales and clays contain potassium and thorium-bearing minerals that produce high gamma-ray readings.

Question 2

Which communication protocol is most commonly used to transfer data between downhole data loggers and surface computers in modern monitoring wells?

Accepted Answer

SDI-12, Modbus, or wireless telemetry (cellular/satellite)

Answer

Modern water level loggers and sensors use SDI-12, Modbus RTU, or wireless telemetry (cellular/satellite) to transmit data to surface control systems or cloud platforms.

Question 3

When using hydraulic fracturing simulation software to plan a well stimulation program, what input parameter most directly controls predicted fracture half-length?

Accepted Answer

Total fluid volume pumped and pump rate

Answer

Fracture half-length is primarily controlled by the total volume of fluid injected and the pumping rate, as more fluid at higher rates extends the fracture further from the wellbore.

Question 4

A driller uses drone-mounted LiDAR to survey a well site before construction. What key benefit does LiDAR provide over traditional ground surveying?

Accepted Answer

It creates a precise 3D terrain model for site planning, drainage, and access road design

Answer

LiDAR (Light Detection and Ranging) rapidly generates high-resolution 3D point-cloud terrain models, enabling precise site layout, grading plans, and stormwater management design.

Question 5

In digital driller's logs, what does 'rate of penetration (ROP)' data help the geologist or driller interpret?

Accepted Answer

Relative formation hardness and potential formation boundaries

Answer

ROP (feet per hour or minute) increases in soft formations and slows in hard rock, providing a continuous indirect indicator of formation changes that helps identify lithologic boundaries.

(CWD) Certified Well Driller Practice Test

(CWD) Certified Well Driller Practice Test

CWD Technology & Digital Tools 4