Title page for ETD etd-06232007-221319


Type of Document Dissertation
Author ALAdwani, Faisal Abdullah
URN etd-06232007-221319
Title Mechanistic Modeling of an Underbalanced Drilling Operation Utilizing Supercritical Carbon Dioxide
Degree Doctor of Philosophy (Ph.D.)
Department Petroleum Engineering
Advisory Committee
Advisor Name Title
Julius P. Langlinais Committee Chair
Dandina N. Rao Committee Member
Richard Hughes Committee Member
Stephen O. Sears Committee Member
Kenneth J. Schafer Dean's Representative
Keywords
  • heat transfer
  • multiphase flow
  • corrosion rate
  • phase change
Date of Defense 2007-06-12
Availability unrestricted
Abstract
Mechanistic modeling of an underbalanced drilling operation using carbon dioxide has been developed in this research. The use of carbon dioxide in an underbalanced drilling operation eliminates some of the operational difficulties that arises with gaseous drilling fluids, such as generating enough torque to run a downhole motor. The unique properties of CO2, both inside the drill pipe and in the annulus are shown in terms of optimizing the drilling operation by achieving a low bottomhole pressure window. Typically CO2 becomes supercritical inside the drill pipe at this high density; it will generate enough torque to run a downhole motor. As the fluid exits the drill bit it will vaporize and become a gas, hence achieving the required low density that may be required for underbalanced drilling.

The latest CO2 equation of state to calculate the required thermodynamic fluid properties is used. In addition, a heat transfer model taking into account varying properties of both pressure and temperature has been developed. A marching algorithm procedure is developed to calculate the circulating fluid pressure and temperature, taking into account the varying parameters. Both single phase CO2 and a mixture of CO2 and water have been studied to show the effect of produced water on corrosion rates. The model also is capable of handling different drill pipe and annular geometries.

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