... is a torsional natural frequency of the drill-string. The susceptibility to excite a certain HFTO mode can be evaluated using a finite element model of the drilling system and a velocity weakening torque-rpm-characteristic ( Hohl et al. 2015 ). The susceptibility S c, k can be calculated according...

... drilling fluids and materials reservoir surveillance production control coriolis flowmeter torque sensor accuracy flowrate precision measurement linearity instrument production monitoring sensor coefficient experiment viscosity apparatus drilling fluid chemistry torque figure rpm vane...

... the top drive revolutions per minute (RPM) setpoint. Therefore, communication with the surface or with neighboring subs is not a requirement for the control implementation. The controller also shows robustness against variations in the top drive RPM and noisy downhole measurements, which is important...

... per bit, less downhole vibrational issues, and economic completion of challenging interbedded abrasive across the world. geologist sedimentary rock clastic rock rpm drilling operation rock type drilling fluids and materials drilling equipment bit design geology optimization problem...

... dysfunction ertd project management benchmarking identification sedimentary rock rock type reservoir geomechanics rop efficiency lithology mensa-wilmot reduction rpm fallacy consideration wob requirement limiter mse equation drilling efficiency guiderail mechanical specific energy...

... the 2nd mode stick-slip is identified, measured, and mitigated to provide a summary of the practical recommendations. Observations and Related Theory Stick-slip Mode Shapes and Natural Frequencies Stick-slip is a severe form of low-frequency torsional oscillation in string RPM created...

..., bit-rock interaction, presence of stabilizers/centralizers) and system input actuations (surface WOB/hookload, surface rotational speed (RPM)/torque, mud motor operational parameters, etc.) are defined in the modeling framework. Simulations are run for different drillstring scenarios in a vertical...

.... Abstract High-Frequency-Torsional Oscillations (HFTO) generate dynamic loads that can damage drilling tools, resulting in, for example cracks, twist-offs or broken electronics. They are triggered by the interaction of bits and rocks and force operators to reduce rotary speed (RPM) and weight on bit (WOB...

...-based rate of penetration (ROP) optimization module is running in real-time, where the safe-operational windows are considered to reduce/avoid drilling accidents, like stick-slip, axial vibrations, poor hole cleaning, and low efficiency etc. The obtained optimal WOB and RPM by solving such ROP...

... ( Pastusek et al., 2007 , Lines et al., 2013 ). Further analyses revealed that HFTO are self-excited torsional modes that are localized only in the lower part of the drillstring ( Oueslati et al., 2013 ), and that HFTO is likely to be created at low rpm in combination with high WOB ( Hohl et al., 2020a...

.... This modeling process, then, can be used to understand vibration problems in the drill string and correct for them by changing the top drive torque-limit settings and the rotary speeds. upstream oil & gas torque overload drilling data rpm change drilling equipment transient torque drillstring...

... rotational speed torque step test drilling operation calculation total mse petroleum engineer motor differential rpm mse wob dysfunction equation Introduction (8) M S E d o w n h o l e = 4 W O B s u r   f π D 2 + 480 ( K t Δ P...

... A similar process is used to identify and redesign RPM limitations. While this is a logical approach to any performance objective, it’s important to remain focused only on WOB and RPM. The question of "what limits us" should be kept to what limits WOB and RPM. Otherwise, it is the authors...

... the optimum ROP and RPM for which the operations will be safer and more reliable. Background Over the next decade, several countries such as the United States, China, Russia, India & EU in addition to private companies such as SpaceX, Blue Origin, Astrobotic, and iSpace will launch exploration...

... The device is suitable for most applications with operational envelope of 150°C and 1000 Bars/14500 psi. Onboard memory enables up to 270 hours recording time at 100 Hz sampling/recording rate. Recording begins automatically. Firmware enables an AutoStart mode based on a configurable RPM...

...ROP/MSE Optimization Abstract On a land-based rig, the driller has many responsibilities and is rarely able to adjust the main process controls, WOB and RPM, on a continuous basis. The result is sub-optimal drilling and longer spud-to-TD time than necessary. Automatic, closed-loop...

... torsional oscillations. More specifically, it can be described as periodic succession of phases, where the bit comes to a complete stop (stick) and then is suddenly released (slip), reaching very high RPMs compared to the Top Drive speed [ 24 ],[ 25 ],[ 17 ]. In practice this is not ideal...

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... operational procedures and models of the drilling process, therefore enabling increased drilling efficiency. Upstream Oil & Gas downhole RPM surface RPM drilling operation drilling fluid rotational speed top-drive speed particle procedure reservoir section stick-slip situation friction...

... and environmental characteristics of the bit were recorded in a dedicated bit sub at 200 Hz while drilling a horizontal well in the Granite Wash formation in the Texas Panhandle. The recorded variables include azimuthal-gamma, tri-axial accelerations, inclination, RPM, and temperature. Recorded data was examined...