Abstract: The governing equations of motion for a drill string considering coupling between axial, lateral and torsional vibrations are obtained using a Lagrangian approach. The result leads to a set of non-linear equations with time varying coefficients. A fully coupled model for axial, lateral, and torsional vibrations of drill strings is presented. The bit/formation interactions are assumed ...

For years, drilling engineers have been faced with the challenge of wells through naturally fractured reservoirs that are present around world. During drilling, pressure at bottomhole a well is frequently intentionally higher than formation pressure, which can result in loss mud surrounding rocks. cementing, even it during because cement slurry density mud. Therefore, if natural or induced frac...

This study aims to evaluate the effect of wheat flour as a natural and environmentally friendly material on properties water-based mud. Recently, many experiments have been conducted with various additives improve drilling fluids. The using new additive fluid was studied rheological filtration properties. In laboratory several samples mud were prepared, different concentrations from 1 wt% 7 add...

Background: Petroleum drilling and exploration operations generate a significant amount of oily wastes. Comparing with physical and chemical remediation methods, bioremediation is cost-effective, highly efficient, and environment-friendly technology.Objectives: The aim of this study was to evaluate biological treatment efficiency for an oil-contaminated s...

A laboratory-based experimental study was conducted to more completely understand the fundamentals of pressure transients produced by Formation Testing While Drilling (FTWD) equipment. These tools can be run in open hole, positioned at a desired level, and actuated to measure reservoir pressure and flow capacity while in a dynamic drilling environment. Any number of pressure measurements can be...

This study highlights the operational and practical advantages of using triplex mud pump systems in favor duplex to optimize drilling capabilities under specific conditions. Additionally, material selection piston subassembly was analyzed simulated parameters SolidWorks determine HNBR over NBR elastomer materials.