Page 358 - Practical Well Planning and Drilling Manual

Section 3 revised 11/00/bc 1/17/01 12:00 PM Page 334

[ ] Practical Wellsite Operations
3.1.10

Stroke counters must be accurate and (if digital) display correctly.
Check also the SPM and total stroke counters on the remote choke
manifold for accuracy and correct display.
D exponent calculations should be made on all exploration wells
where shown in the drilling program.

3.1.10. Suggested Rig Takeover Checklist

It is good practice for the drilling supervisor in charge of an oper-
ation to use a short checklist of things to look over. It is not possible to
check everything on the rig, but those items essential to safety and effi-
ciency can be checked out with a short walk around. A checklist is a
guide for your eyes; for instance, while looking at the breakout lines
you should also look at the guide rollers and the hoses to the cathead.
Figure 3-4 provides some ideas for a regular routine. The list can
be photocopied if desired.

3.1.11. Minimum Mud Chemical Stock Levels Held on Rig

Below are some suggested minimum levels. Company policy or
government regulations may dictate different amounts.
Barite. The amount of barite available on site must not fall below
that needed to weight up the complete active system to the equivalent
mud weight (EMW) of the last casing shoe test. If stock does fall below
this while working with open hole, operations are to be suspended
until the stock is at the necessary level.
The minimum level of barite should be 50 tons during
appraisal/development drilling, or 100 tons during exploration drilling.
Cement. A minimum of 50 tons should be kept available on site.
Inform base immediately if stock falls below this level.
LCM. Sufficient LCM materials of various grades/types should be
available as appropriate for the drilling operation in hand, but a minimum
of 500 sx is to be kept on site. A suggested mix of LCM types is two pal-
lets of Kwikseal, one medium and one coarse pallet of fine mica, and one
pallet of DF-Visc (to make the pill viscous before adding LCM).

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