The porosity, permeability, rock material and fracture networks of the newly discovered tight carbonate reservoir rock, Early Cretaceous Sarmord Formation in Zagros basin are examined. methods used to investigate formation cores, micro-resistivity image logs, drill stem tests, drilling fluid data, petrophysical wireline data drilled cutting samples. analysed show that is characterized by extens...

Because neurosurgery and orthopedic surgery often require the drilling of bones, this paper attempts to solve the problem of bone drilling. The goal is to realize a control system, which is able to drill with a contact drilling force and can automatically stop drilling at the moment of breaking through. In particular, both the de drilling mntor control and the feed rate control are driven by fo...

Bone drilling is widely used in orthopaedics and surgery; it is a technically demanding surgical procedure. Recent technological improvements in this area are focused on efforts to reduce forces in bone drilling. This study focuses on forces and a torque required for conventional and ultrasonically-assisted tool penetration into fresh bovine cortical bone. Drilling tests were performed with two...

Multistage hydraulic fracturing is one of the most prevalent approaches for shale reservoir development. Due to complexity constructing environments experiments, numerical simulation a vital method study flow behavior under conditions. In this paper, we propose model that considers multistage fractured horizontal well with hilly-terrain trajectory in presence natural fractures. The was construc...

In this research, finite element analysis of the conventional drilling and vibration assisted drilling is carried out. The ABAQUS software is employed for FE analysis. The Johnson-Cook models for both plastic deformation and damage are employed for FE simulation.The results of the FE analysis are then verified with experimental results in both conventional and vibration assisted drilling on Al ...

drilling fluid is the most important lifeline of the drilling operation, that main task is facilitate the cuttings removal of the drilling. there are varieties of drilling fluids such as sodium bentonite based-drilling fluid is called “mud” and drilling foam or surfactant based-drilling fluid is called “soap”. the present work aims are study on the modified drilling mud properties by using the ...

The aim of this investigation is to devise a robust detection method for drill bit break-through when drilling into long bones using an automated drilling system that is associated with mechatronic assisted surgery. This investigation looks into the effects of system compliance and inherent drilling force fluctuation on the profiles of drilling force, drilling force, drilling between successive...

Whether naturally- or artificially-induced due to human activities, decreasing increasing the suction in multiphase-fluid-saturated porous materials can lead enormous changes their thermo-hydromechanical properties. In this, both mathematical description and numerical modeling of coupled problem present a challenging task. The following contribution considers instance related micro-cryosuction-...

The interaction between friction and vibration is a widely recognised source of inefciency in all mechanical systems. The nature of this interaction is very dependent on the dynamic environment and its control requires a detailed understanding of the mathematical structure governing the stability of this environment. Although the fundamental causes of friction-induced intermittent motion have b...