Technology Consultants a.s
PFAS is designed to...
Be a general tool for Planning,
Follow-Up and Post-Analysis of wells.
Handle all kinds of depth
related information plus time based drilling data.
Provide a common source
of data for decisions across professions and departments.
PFAS version 8.0
see a large
Integration of density logs or
Fracture and Collapse pressure
is used to find the minimum and maximum mudweoight. The calculation
are using Kirch equations and optional failure criteria. Most common
is Mohr Coulomb.
(Eaton, Matrix and Quick
Look methods) - using trend lines d-Exponent
Make your own
calculations, performed on any log (no more spreadsheets). Use up
to 8 logs in one calculations.
The PFAS Cycle
ANALYSIS: The first stage is to utilise the collected data to produce
the Final Well Report and in post-analysis. Based on experience transfer
from previous wells the prognosis for the next well in an area may be
PLANNING: Planning is based on geological prognosis, rock
strength correlations, in-situ stresses, pore pressure, well geometry and
mud chemistry. A prognosis for well integrity trends based on effective
stresses and strengths can then be established.
FOLLOW-UP: During drilling, well integrity trends, including
well path and formation tops, may be monitored by updating: Pore pressure,
stresses, lithology and mud weight. Registration of events during drilling
or other information for post analysis purpose will may also be included.
PFAS may in particular be advantageous when planning advanced drilling
operations, like Slim Hole Drilling, Under-Balanced Drilling, drilling of
HTHP wells, Horizontal wells, Multi-Branch wells and in Deep Water
Drilling operations, where well integrity issues are critical.
- Logs are imported from ASCII text files and LAS files. PFAS
can handle up to 200 logs in one project.
- Templates simplify repetitive Import of logs from similar
files and to View/Print uniform reports.
- Merging of logs, user defined cut-off, compressing /
stretching. Use templates to merge a new log section to existing data
- Units. At any time, a unit can be changed to a convertible
unit. For example, the pore pressure may be displayed in sg,
g/cm3, ppg or psi/ft. Depths can be in meters or feet.
- Synthetic logs (for planning of new wells) can be made by
compressing or stretching logs (copy and paste).
- Correlations involving logs can be performed by using both
log value and depth. Logical expressions can be used to perform
calculation in selected intervals only. The result of the calculation
can be a new log, or it can be merged to an existing log (in a given
interval). (See User Defined
- Edit logs visually or in text mode. Click and drag, copy and
paste segments of one log to another.
- Lithology: can be entered as text or visually edited fast and
- Litho- and Chronostratigraphy: Choose from standard
nomenclature for the actual field.
- Depth Data (non log information): A user defined system for
reporting all kind of depth related comments or events. Can easily be
modified to meet individual needs and specifications. (Define your own
symbols and plot options)
- Presentation: All logs and data can be viewed/printed in the
depth reference preferred and up to 12 tracks with 8 curves in
each track can be shown at once. Templates saves time and makes
presentations fast and consistent.
- Deviated Wells: Logs can be imported in Measured depth or
TVD. Survey data can be entered and updated at any time.
- Free Text: Place comments anywhere on a presentation.
The PFAS Power
PFAS handles all kind of depth related data (for example logs or
incidents related to depths) and time based drilling data. Attach a
survey, and the reports can be presented in TVD or MD or both.
The figure below shows the data used by PFAS in a well planning process in
NOTE: This is not required data, but it shows the power of the
application. (A lot of useful information can come from only a few data in
PFAS). QA/QC is an integrated part of PFAS.
Multiple Wells, Cross-section:
Up to 15 wells can be viewed at once to make correlations between