... integrated into a standard mandrel D&I tool, as used in most directional drilling operations. In addition to time-domain statistics, high frequency accelerometer data is processed downhole to provide frequency-domain spectral information, which in combination with rotation speed information derived from...

... Abstract The paper describes a systematic approach for mitigating High Frequency Torsional Oscillation vibration (HFTO) for a motorized rotary steerable system (RSS) through bottom hole assembly design (BHA), drill bit design and real time mitigation technology and processes. There have been...

... of instability. Next, it focuses on the physical causes or conditions for instabilities to occur. The root cause is identified to be an inherent and poorly dampened bending mode of the entire drillship. This mode has a natural frequency equal to the vibration frequency observed during the instability event. Two...

... Abstract This paper presents development of a system to test the origins of high-frequency torsional oscillation (HFTO) and identify the physical cause that allow for building information, which will alleviate this damaging dysfunction. It will present field data where the actual amplitude...

... With all dynamic events, appropriate measurement is fundamental to characterization. The sampling frequency of the data is important, but the preprocessing is also critical. Aliasing is a known issue with dynamic systems and occurs if the sampled event has frequency components which are higher...

... the model equation, learning method, and anomaly calculation method. Second, using field data from multiple wells collected over several months, we analyze the timing of false alarms and further refine the model to reduce them. Finally, to evaluate the profitability of our method, we examine the frequency...

... rate). Other risk factors include poor damping of the generated fastline vibrations and high fastline inclination (deviation from vertical). Even though inherent bending resistance of the wire rope is a significant damping mechanism for high-frequency vibrations, it is very weak for low-frequency...

... (see for example ( Tikhonov, et al. 2014 ), (Wilson and Noynaert 2016 ), ( Smith, et al. 2020 ), and ( Mahjoub, et al. 2020 )), but requires significant computation time and computing power. Simpler models are rather based on frequency domain. By assuming a relation between the external excitations...

... and the vibration data. Real-time induced bit vibration was observed and recorded using a high-frequency tri-axial accelerometer. The results from this experiment provide precise and insightful visual information for BHA trajectory correlation with the acceleration data acquired under field-like fluid flow...

... of 11,903 ft produced a unique opportunity to collect high-quality data that reduces the damping uncertainty. This paper describes damping ratio and natural frequency identification for the first few axial riser modes for this deployment. The data was collected during deployment and retrieval using Subsea...

... be applied on selected IMFs by comparing the IMF’s impact frequency with the system’s natural frequency so its harmonic drillstring failure can be diagnosed more precisely. united states government drilling equipment noise expert system real time system artificial intelligence frequency...

... fluctuations in the rotational nodes during torsional vibration. A high-resolution drilling dynamics recorder was utilized to record a spectrum of torsional vibration frequencies, confirming the presence of the 2nd mode shape of torsional vibration. The multiple degrees of freedom spring-mass model was used...

... models and validated using downhole data. Physics based models in the advisory system are used to compute the first five modes of natural frequencies for axial, torsional and lateral vibration. The contextual data required for the calculations consists of the bottom hole assembly (BHA) and survey data...

... fundamental frequencies of up to 400 Hz with harmonics (some of which can be larger amplitude than the fundamental) in excess of 1100 Hz. There are a plethora of drilling dynamics logging tools available. For example, Sugiura and Jones (2020) and Townsend (2021 ) describe memory tools while Hohl et al...

.... These torsional vibrations are characterized by their relatively high frequency up to and above 500 Hz and tangential acceleration amplitudes which can exceed 100 g at a radius of 60 mm. Downhole electronics, especially, suffer the effect of stress and fatigue as a result of high tangential vibration amplitudes...

... drilling systems and equipment frequency oscillation bit selection drilling operation lateral drilling performance rop vibration mitigation tool magnitude vibration mitigation technology vendor vibration tangential vibration bha design basin lateral vibration trial well Background...

... Abstract High-frequency torsional oscillation (HFTO) is recognised as one of the more damaging drilling dysfunctional mechanisms. The HFTO can cause significant tool damage in addition to nonproductive time (NPT). This vibration has been shown to be more prolific in motor powered steering...

... One kind of detrimental vibrations occurring typically when drilling hard and dense formations are high-frequency torsional oscillations. These torsional vibrations are excited by the rock cutting process at the bit through a self-excitation mechanism ( Jain et al., 2014 ; Oueslati et al. 2013...

... drilling fluids and materials machine learning upstream oil & gas artificial intelligence damage test accuracy test dataset mud pump state data cohen sensor operation normal state drilling fluid management & disposal frequency baseline algorithm generally-applicable...

... Abstract High frequency torsional oscillation (HFTO) has gained considerable attention over the past several years due, in large part, to the continued use of motor-assisted Rotary-Steerable Systems. The consequences of such vibration events can be increased repair and maintenance costs, noisy...