Drill time log
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The document discusses drill time logs, which record the rate of penetration of rocks during drilling to identify changes in subsurface rock types and formations in real-time. Drill time logs are recorded on a paper chart mounted on a drum in a geolograph machine and depend on factors like rock type, bit type, revolutions per second, and drilling parameters. They can identify porous zones and are recorded in units of minutes per foot or meter.
Drill time log
- 2. Today we will discuss about Drill Time Log. Can any of you tell me about this log??? NOBODY!!!! Ok no problem I am here to brief you about this. Now listen all of you carefully.
- 3. Drill Time Log • Used to record the rate of penetration in the rocks or formation.
- 4. How we record it?? • Recorded on paper chart around a drum in Geolograph. • Because this Log is recorded as the well is drilled
- 5. • Changes in the subsurface rocks are recorded instantaneously • That is why Drill time Log is Real Log.
- 6. Dependence It depends upon Rock type Drill parameters
- 7. Drilling rate is affected by Bit type Revolution per second With tricone drilling bit Sandstone have fast drilling rate Shales are intermediate Carbonates are lowest
- 8. Drilling Break • The suddent Change in penetration of bit is drilling break. • Also used to locate porous zone Units Recorded in minutes per foot or meter.