Page 29 - Practical Well Planning and Drilling Manual

Section 1 revised 11/00/bc 1/17/01 2:55 PM Page 5

Preliminary Work for the Well Design [ ]
1.1.2

3. Essential well design data:
Precompletion and completion requirements with conceptual
completion design
Preparation work required in advance of running the comple-
tion, including permanent packers, gravel packs, completion
fluid specifications, etc.
Perforation intervals; perforation type (if known)
Completion or logging sump required below the bottom perf
depth (e.g., bottom perf to liner wiper plug and/or bottom of
zone of interest to total depth)
Completion profile fully defining all elements of the comple-
tion hardware with depths; tubing, packers, subsurface safety
valves (SSSVs), nipples, electric submersible pumps (ESPs),
etc.
Completion pressure testing requirements
Future stimulation work envisaged, including fluids pumped,
pressures used during stimulations, possible gas lift, etc.
Temperatures and pressures anticipated during the production
life of the well
Likely reservoir fluid composition; any H S or CO possible?
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Options envisaged for future well interventions, including
wireline/coiled tubing work, workovers, or recompletions (e.g.,
on another zone once primary zone is depleted)
Xmas tree and completion status on handover from drilling
(e.g., plugged and depressured, killed, valve configuration,
etc.)
Type of abandonment envisaged at the end of the well’s pro-
duction life
Any other relevant information on the completion not covered
above
Pore pressure and fracture gradients vs. depth plot (it is useful
to ask for the PPFG plot to show “best” and “worst” cases)
Shallow gas information (e.g., from shallow seismic surveys
and offset wells)
Geological/seismic correlation, including all possible faults that
may be encountered
Lithology/petrophysical correlation
Well directional targets (show downhole constraints to justify
targets)
Surface location including site survey and bathymetry map, if
applicable
Required zonal isolation of reservoirs
Likely temperature profile with depth

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