Visit our web site:

The Driller's Geophysicist™

Dedicated to the art and planning of pore pressure prediction and potential drilling hazards.

Issue Number 3                                          

Reservoir Sealing Capacity

Reservoir sealing capacity, VES, Matrix Stress: what's it all about? Drillers have provided a measurement of reservoir sealing properties which is invaluable to explorers. The driller's leak off test (LOT) when properly taken can allow direct measurement of reservoir sealing capacity. Unfortunately, the reported test is maintained, but the actual test data is lost on many wells. BPI, through discussions with its customers is making a strong effort to have the actual test data graphically recorded for further analysis. The shape and style of the test vary amongst drillers and operating companies. The LOT when combined with the casing test can be a diagnostic like an EKG, or to mention it: a seismic wavelet. Small characteristics of the LOT can indicate small or large channeling, a measurement of permeability and fluid sealing capacity of the host rocks.

Gas column height and oil column height potential can be estimated from a basin model study and calculation from 3D and 2D seismic and LOT data. There have, in the past few years, been improperly reported information from research and university sources that ignore real data for wells and reservoirs they never evaluated. In their limited analysis, gross errors were repeatedly quoted and re-quoted by their university and research peers. For a complete explanation and to learn more, ( or to share and discuss the work that BPI has provided in this important and interesting area ), call our Houston office.

It's all in the Name

The name of the BPI Newsletter has changed to The Driller's Geophysicist™ starting with this November issue. For many years and continuing today, engineers have been sometimes confused by so called scientists who attempt to provide well planning geologic and geophysical information, including the often referred to 'black box.'

What separates BPI from the pack is our understanding of planning needs and our refined approach towards problem solving of drilling problems using geologic and geophysical data. Our commitment is based on our belief that geology and geophysics is a sub-set of planning. This is upsetting to the Geoscience group.  G&G are tools available to the modern engineer.

BPI represents itself as planning geophysicists, solving petroleum planning problems using exploration technology. That's exactly what we do. This has been our attitude and approach for over 25 years.

What does all this mean for engineers? It means that BPI will provide honest solutions similar to its Seismic Pressure Prognosis service. Straight answers, no arm waving. Just answers that reflect the data examined and interpreted from an engineering point of view.






BPI Newsletter is published and freely distributed by:

Baird Petrophysical Group, Inc.

1784 W. Sam Houston Pkwy N.

Houston, Texas 77043-2723.


The results discussed herein are based on interpretation of drilling planning, geological, geophysical and other scientific data supplied to Baird Petrophysical by its various customers on a private basis.  It is the Reader’s responsibility to value its use.  Baird Petrophysical specifically disclaims and does not warrant any of its news, comments, interpretations or opinions about the information presented here.

Communication with BPI:

Tel:       (713) 461-1784                       Fax:      CALL

Email:                Web: