10 Questions
What is the primary purpose of a gamma ray log?
Quality control of log readings
In the context of the text, what does a hole being 'on gauge' mean?
Circular hole shape
Why can the gamma ray log be badly affected in intervals that suffer from caving?
Increased drilling mud between formation and detector
What does a caliper log show when the hole size is lower than the bit size?
Presence of mud cake
Why is a four arm caliper log preferred over a single caliper for interpreting borehole shape?
Provides better definition of the hole shape
What is the significance of the hole size being lower than the bit size in a caliper log?
It indicates the presence of a mud cake and a permeable zone
What is the role of the caliper arm in a caliper log?
It measures the hole diameter and pushes the density sensor on the borehole wall
What is the implication when the actual hole size is higher than the bit size in a caliper log?
It indicates the presence of a caving or washout
What is the significance of a permeable zone in petroleum engineering?
It is the first job of a petroleum engineer to identify permeable zones as only permeable rocks can be reservoirs
What is the role of the caliper log in quality control of other logs?
It helps in identifying if the hole size is larger at a particular depth, which can make the log readings unreliable
Learn about the Caliper log, a tool used in well logging to measure hole size and shape with depth. Understand how the caliper arms work, how hole diameter is measured, and how it helps in detecting mud cake presence.
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