Page 315 - Practical Well Planning and Drilling Manual

Section 2 revised 11/00/bc 1/17/01 12:04 PM Page 291

2.8.3
Formation Evaluation [ ]

A fully computerized unit with readout screens is used in the
drilling supervisor and toolpusher offices. Calculate the D exponent,
sigma log, and gas fracture gradient continuously and monitor the
active tank levels and gas readings. Inform the driller (first) and
drilling supervisor of any significant change.
The following readings should be taken. At the end of the well
these should be available on a 3 /2 in floppy disk as a spreadsheet file
1
or a tab delimited ASCII file (depth-based table):

Depth, in 5 ft intervals
Drilling rate, in ft/hr
Weight on bit, in klbs
Rotary speed
Rotary torque, in ft/lbs (Torque should not be reported in motor
amps since future evaluation is impossible unless the motor and
gearing are known to convert to torque)
Pump output, GPM
Pump pressure, psi
Mud density in, psi/ft
Mud density out, psi/ft
Mud temperature in, ˚C
Mud temperature out, ˚C
Gas readings (total gas)

Printouts are required at the end of the well with a time-based
record of bit depth, hook load, RPM, torque, flow rate, pump pressure,
and active pit volume/trip tank volume (as applicable).
Place at least two ditch magnets in the possum belly tank. Clean
each midnight and report Kg of metal recovery each day. Be careful to
measure actual metal content without mud solids, etc. that will adhere
to the metal. Describe the type of metal shavings seen (e.g., resemble
lathe cuttings, flakes, fine powder, scale).
Cutting sampling. Ditch samples are to be taken at 10 ft intervals to
the 9 /8 in casing point and 5 ft intervals thereafter. Three sets of wet
5
samples, three sets of washed and oven-dried samples, and one set of
samples for drilling department shale analysis are required in all drilled
sections. Show the lithological description for each 5 ft drilled from
cuttings samples.

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