The main task of drilling the formation by the bit is done via scraping, crushing and grinding. Discharging the fluid from the bit nozzles is done with high pressure which assists to break the rocks. Different parameters affect the bit selection and design for each drilling formation, but the most important one is drillability that depends on hardness of the formation. In this paper, the design...

With the development of oil drilling in depth, strata are more ancient and abrasive. The Rate Penetration (ROP) is low conventional methods, Positive Displacement Motor (PDM) matching PDC bits often used to improve it. However, application excessive Weight on Bit (WOB) would easily lead PDM brake, over-standard well inclination, bit wearing aggravation other bad phenomena. Moreover, ROP improvi...

the main task of drilling the formation by the bit is done via scraping, crushing and grinding. discharging the fluid from the bit nozzles is done with high pressure which assists to break the rocks. different parameters affect the bit selection and design for each drilling formation, but the most important one is drillability that depends on hardness of the formation. in this paper, the design...

Issues of resonance that appear in non-standard random walk models are discussed. The first walk is called repulsive delayed random walk, which is described in the context of a stick balancing experiment. It will be shown that a type of ”resonant” effect takes place to keep the stability of the fixed point better with tuned bias and delay. We also briefly discuss the second model called sticky ...

Stick insects can usually be seen doing one of two unexciting things: standing still or walking. During walking, stepping movements are generally considered to be governed by one to several control centres associated with the joints that make up each leg. In order to walk in a coordinated fashion, the activity of these control centres must be synchronised, so that all the joints in one leg are ...

Abstract The longitudinal vibration of the bottom drill string is violent and law complex during deep well drilling. brings many adverse effects on drilling pipe fracture bit trampoling. Generally speaking, effective way to control install damping device in hole. research group proposes a that uses energy modulate impact dynamic load, which converts downhole not conducive into mechanical improv...

Introduction. Torsional vibrations caused by drilling using a polycrystalline diamond compact (PDC) bit are analysed wellbore data obtained under various modes. The torsional analysed. Two types of vibrations, including those the cutting action and frictional forces. Aim. To investigate induction as result rock destruction PDC bits. Materials methods. research methodology was based on “Richard-...

Drillstring–borehole interaction can produce severely damaging vibrations. An example is stick–slip vibration, which negatively affects drilling performance, tool integrity and completion time, costs. Attempts to mitigate vibration typically use passive means and/or change the operation parameters, such as weight on bit rotational speed. Automating latter approach, by of feedback control, holds...