The process of drilling a borehole is very complex, involving surface and downhole drilling
systems, which interact with the drilling fluid and the surrounding rocks. Modeling and …

Toolface adjustment methods for directional drilling in oil and gas drilling currently rely
heavily on manual real-time interventions for continuous adjustment. However, due to the …

A polycrystalline diamond compact (PDC) bit combined with a vertical steering tool known
as Power-V has shown effective results in controlling deviation and increasing the rate of …

Efforts to improve the performance of drilling with downhole motors, in particular screw
motors, lead to energy tension, complication of work processes and design schemes [1–3] …

Natural frequencies were analyzed (axial, torsional and flexural) and frequency response of
a vertical rotor with a hard disk at the edge through the classical and complex modal …

Downhole vibration during drilling operations is considered as one of the main impediments
of the drilling process and is a major concern to drillers. The most severe instances of axial …

The Aktobe project is at the east margin of the Pre-Caspian Basin, where horizontal well is
mainly used to develop the low porosity and permeability layers. To improve production per …

Soil improvement is originally an economical solution to make soil buildable, particularly
compared to deep foundation methods using piles. The object of this research is the …

Aiming at the problem of stick-slip vibration caused by sudden drilling resistance torque
during drilling in coal seam with gangue, the drilling tool dynamic model with two degree of …

North Tluwa and Zanazor oilfields under the Aktobe project are located at the eastern
margin of the Pre-Caspian Basin. The low-porosity and low-permeability reservoirs in the …