An effective drilling fluid removal is necessary to achieve an efficient cementing in oil and gas industry, i.e., it ideal that all the displaced by cement slurry. The displacement efficiency closely related stability development of displacing interface between slurry fluid. Thus, requires a validated theoretical model describe guide applications, especially for highly deviated wells. current s...

Rotational drilling was a revolution in drilling technology. It made the drilling process more efficient and faster and more depth of well could be achieved through rotation method. Besides all of its advantages, the rotation approach induced some problems like pipe sticking and downhole cleaning to the drilling procedure. Hole cleaning and reduction of torque and drag seems to be vital in incl...

A possibility to control the electrical activity of extended defects (grain boundaries, dislocations) under annealing and hydrogen plasma treatment by different regimes of silicon ribbons grown with the edge-defined film-fed growth technique was studied. It is shown that the results of hydrogenation of grain boundaries (GBs) significantly depend on two factors: the type of GBs (deviated or gene...