Preface
My first exposure to the importance of good hole cleaning and pressure analysis occurred in 1981
when I was initiated into the petroleum industry, having left the aerospace industry, for which
I had trained diligently. The new subject matter was not glamorous, to say the least, but years later
I would come to understand its significance in both drilling and cementing. The advent of deviated
and horizontal wells elevated the role of annular flow in oilfield operations.
A decade later, I published my first book on borehole flow modeling, introducing the use of
curvilinear grid systems to accurately capture the physics. Over the years, this effort was selffunded
and undertaken as a labor of love. However, another decade later I launched my consulting
company, Stratamagnetic Software, LLC, supported by the U.S. Department of Energy through its
Small Business Innovation Research Program, under Grant DE-FG03-99ER82895, to improve grid
generation techniques for the oil industry. Related work in this area with several clients continued
over the years in different and varied applications.
In 2009, the Department of Energy awarded a contract to support my technical proposal
“Advanced Steady-State and Transient, Three-Dimensional, Single and Multiphase, Non-
Newtonian Simulation System for Managed Pressure Drilling.” This comprehensive effort was
administered by the Research Partnership to Secure Energy for America (RPSEA) through its
Ultra-Deepwater Program under Subcontract No. 08121-2502-01. This award enabled my colleagues
and I to “tie up loose ends” and integrate numerous models developed over two decades.
More important, it provided us the opportunity to significantly extend our models in numerous
directions—rotating flow, fully transient effects, three-dimensionality, multiphase, and so on—and
to perform research and develop software models that we felt would have a lasting influence on the
petroleum industry.
We are very fortunate that many in the industry have recognized our efforts. Aside from those who
have provided us this source of important funding, anonymous reviewers have made it possible for us
to publish five recent papers: four for the American Association of Drilling Engineers (AADE)
National Technical Conference and Exhibition, during April 2011 in Houston and one for the
Offshore Technology Conference during May 2011, also in Houston. We are of course gratified that
Gulf Professional Publishing/Elsevier has agreed to publish this book, Managed Pressure Drilling:
Modeling, Strategy and Planning, which will no doubt achieve wide dissemination of our ideas.
Consistent with my belief that scientific research should be openly shared by industry, this book
and the papers my colleagues have presented disclose all elements of the new annular flow models:
mathematical theory, numerical implementation, source code examples, and computational validations,
with comparisons to laboratory and field data and results whenever possible. Because of
our research focus, and because our ideas are always evolving, the methods developed here and
implemented in software are provided “as is” and no claim is made that they address all potential
technical issues.
It is hoped, however, that others will study the models and help to improve them through use
and research. Over the next several months, the plan is to widely disseminate the software, on
which great effort has been expended in order to optimize the user’s experience through a versatile
vii
Preface
My first exposure to the importance of good hole cleaning and pressure analysis occurred in 1981
when I was initiated into the petroleum industry, having left the aerospace industry, for which
I had trained diligently. The new subject matter was not glamorous, to say the least, but years later
I would come to understand its significance in both drilling and cementing. The advent of deviated
and horizontal wells elevated the role of annular flow in oilfield operations.
A decade later, I published my first book on borehole flow modeling, introducing the use of
curvilinear grid systems to accurately capture the physics. Over the years, this effort was selffunded
and undertaken as a labor of love. However, another decade later I launched my consulting
company, Stratamagnetic Software, LLC, supported by the U.S. Department of Energy through its
Small Business Innovation Research Program, under Grant DE-FG03-99ER82895, to improve grid
generation techniques for the oil industry. Related work in this area with several clients continued
over the years in different and varied applications.
In 2009, the Department of Energy awarded a contract to support my technical proposal
“Advanced Steady-State and Transient, Three-Dimensional, Single and Multiphase, Non-
Newtonian Simulation System for Managed Pressure Drilling.” This comprehensive effort was
administered by the Research Partnership to Secure Energy for America (RPSEA) through its
Ultra-Deepwater Program under Subcontract No. 08121-2502-01. This award enabled my colleagues
and I to “tie up loose ends” and integrate numerous models developed over two decades.
More important, it provided us the opportunity to significantly extend our models in numerous
directions—rotating flow, fully transient effects, three-dimensionality, multiphase, and so on—and
to perform research and develop software models that we felt would have a lasting influence on the
petroleum industry.
We are very fortunate that many in the industry have recognized our efforts. Aside from those who
have provided us this source of important funding, anonymous reviewers have made it possible for us
to publish five recent papers: four for the American Association of Drilling Engineers (AADE)
National Technical Conference and Exhibition, during April 2011 in Houston and one for the
Offshore Technology Conference during May 2011, also in Houston. We are of course gratified that
Gulf Professional Publishing/Elsevier has agreed to publish this book, Managed Pressure Drilling:
Modeling, Strategy and Planning, which will no doubt achieve wide dissemination of our ideas.
Consistent with my belief that scientific research should be openly shared by industry, this book
and the papers my colleagues have presented disclose all elements of the new annular flow models:
mathematical theory, numerical implementation, source code examples, and computational validations,
with comparisons to laboratory and field data and results whenever possible. Because of
our research focus, and because our ideas are always evolving, the methods developed here and
implemented in software are provided “as is” and no claim is made that they address all potential
technical issues.
It is hoped, however, that others will study the models and help to improve them through use
and research. Over the next several months, the plan is to widely disseminate the software, on
which great effort has been expended in order to optimize the user’s experience through a versatile
vii
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