The knowledge of turbulent flow pressure loss through the drill bit is fundamental for drilling optimization, since major discrepancies have been found between measured values and those predicted by models. The present ...

In the oil and gas industry, two main techniques are used in drilling operations to pump the drilling mud. The direct circulation, or convetional circulation, consists of the injection of the fluid through the drilling ...

Drilling fluids present a thixotropic behavior and they usually gel when at rest. The sol-gel transition is fundamental to prevent the deposit of rock fragments, generated by drilling the well, over the drill bit during ...

Drilling fluids present a thixotropic behavior and they usually gel when at rest. The sol-gel transition is fundamental to prevent the deposit of rock fragments, generated by drilling the well, over the drill bit during ...

During drilling operations in oil wells, fluid invasion and lost circulation problems, caused due to the presence of fractures in the well wall, are recurrent. One highly used solution is the use of particulate additives ...

An important task during well drilling in deep water is the control of the bottomhole pressure within a narrow range. Whenever the bottomhole pressure becomes smaller than the formation pressure there is a risk of formation ...