Page 9 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

viii Preface

for wettability of oil and gas reservoir rock surface porous medium, and
develop new drilling and exploration technologies.

This book presents theoretical basis for wettability of oil and gas reservoir rock
surface porous medium and its application in petroleum engineering, mainly
based on the “Theoretical study of gas wettability of oil and gas reservoir
porous medium” project (Project No: 50925414), which was undertaken by
Professor Jiang Guancheng, under the aegis of Natural Science Outstanding
Youth Fund of the People's Republic of China. It partially utilizes information
from the “New drilling fluid technology that protects different permeability oil
and gas reservoir” project, a key science and technology subproject (Project
No: 2009ZX05009-005, 2011ZX05009-005) undertaken by Professor Jiang
Guancheng during the 11th five-year and 12th five-year plan period of the
People's Republic of China; “Drilling fluid technology for carrying drill cut-
tings and oil removal technology by oil cuttings,” a key science and technol-
ogy subproject (Project No.: 2011ZX05021-004) undertaken by Professor
Jiang Guancheng during the 12th five-year plan period of the People's
Republic of China; “Trapezoidal protection technology for water-injection in
oil and gas reservoirs with low permeability and extra-low permeability,” a key
science and technology subproject (Project No: 2008ZX05013-002), under-
taken by Professor Jiang Guancheng during the 11th five-year plan period of
the People's Republic of China; and “New technology for harmless disposal of
waste drilling fluid and resource reutilization,” a Science and Technology
Supporting Technology subproject of the People's Republic of China (Project
No: 2008BAC43B02) undertaken by Professor Jiang Guancheng. The tentative
application of this technology has illustrated certain advantages and realized
“zero damage” to oil and gas reservoirs around the drilling shaft. It has
improved protective effect for oil and gas reservoirs and single well daily oil
production by 20%, compared to other commonly used drilling and comple-
tion fluids for protecting oil and gas reservoirs. Combining wettability reversal
technology, water-blocking resistance technology, and film technology pro-
vides a new method to reduce damage to oil and gas reservoir with low per-
meability and extra-low permeability, caused by drilling and completion
fluids. This work systemically summarizes basic theory and application of gas
wettability and its specific application further to develop and improve China’s
petroleum engineering and reservoir protection technology. However, theoreti-
cal basis for wettability of oil and gas reservoir porous medium is original
research. Wettability’s application in petroleum engineering is not limited to
drilling fluid technology for protecting oil and gas reservoir, drilling fluid tech-
nology for carrying drill cuttings, trapezoidal protection technology for water-
injection oil and gas reservoirs with low permeability and extra-low permeabil-
ity, and oil removal technology by oil cuttings mentioned in this book, it also
has other applications, such as in reservoir numerical simulation technology.
However, studies on these aspects still need further development. Publishing
this work is aimed at fueling international interest in studying gas wettability
theory of oil and gas reservoir porous medium, apply results to new methods