Drilling Dynamics Model to Mitigate High Frequency Torsional Oscillation

2020 ◽  
Author(s):  
Yuelin Shen ◽  
Wei Chen ◽  
Zhengxin Zhang ◽  
Adam Bowler ◽  
Benjamin Jeffryes ◽  
...  
Keyword(s):  
High Frequency ◽  
Torsional Oscillation ◽  
Dynamics Model

scholarly journals Adaptive Disturbance Rejection Control for Automatic Carrier Landing System

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Xin Wang ◽  
Xin Chen ◽  
Liyan Wen
Keyword(s):  
High Frequency ◽  
Disturbance Rejection ◽  
Closed Loop ◽  
Simulation Studies ◽  
Dynamics Model ◽  
Rejection Algorithm ◽  
Output Tracking ◽  
Disturbance Rejection Control ◽  
Control Scheme ◽  
Final Approach

An adaptive disturbance rejection algorithm is proposed for carrier landing system in the final-approach. The carrier-based aircraft dynamics and the linearized longitudinal model under turbulence conditions in the final-approach are analyzed. A stable adaptive control scheme is developed based on LDU decomposition of the high-frequency gain matrix, which ensures closed-loop stability and asymptotic output tracking. Finally, simulation studies of a linearized longitudinal-directional dynamics model are conducted to demonstrate the performance of the adaptive scheme.

High-Frequency Torsional Oscillation Laboratory Testing of an Entire Bottom Hole Assembly

2017 ◽  
Author(s):  
Heinisch Dennis ◽  
Winkler Mathäus ◽  
Herbig Christian ◽  
Hohl Andreas ◽  
Reckmann Hanno
Keyword(s):  
High Frequency ◽  
Laboratory Testing ◽  
Torsional Oscillation ◽  
Bottom Hole ◽  
Bottom Hole Assembly

Utilizing Downhole Sampled High-Frequency Torsional Oscillation Measurements for Identifying Stringers and Minimizing Operational Invisible Lost Time ILT

2021 ◽  
Author(s):  
Andreas Hohl ◽  
Danial MacFarlane ◽  
David Selvaag Larsen ◽  
Kjetil Olsnes ◽  
Sergiy Grymalyuk ◽  
...  
Keyword(s):  
High Frequency ◽  
Systems Approach ◽  
Torsional Oscillation ◽  
Maximum Amplitude ◽  
Detection Algorithm ◽  
Directional Drilling ◽  
Operational Parameters ◽  
Rock Interaction ◽  
Horizontal Drilling ◽  
Lost Time

Abstract Horizontal drilling has been the industry standard for oil production wells in the North Sea for decades. Significant improvements have been made in the precision of directional drilling by rotary steerable systems (RSS), nevertheless there remain opportunities to mitigate operational challenges in complex drilling environments. One such challenge is the occurrence of hard stringers interbedded between soft sandstone and limestone formations within the reservoirs. The interaction between the bit and hard stringers at the interfaces can lead to a deflection of the bit, resulting in high local doglegs (HLDs), and excessive static loads unless mitigation actions are triggered in a timely fashion. Operational parameters have to be adjusted during hard-stringer drilling, but are also constrained in the underlying formation to avoid HLDs and guarantee bit and BHA integrity. The key to efficient stringer drilling presented here is a consistent, timely and reliable method of detecting stringers. This is enabled by a fit for purpose stringer detection algorithm embedded in a measurement-while-drilling (MWD) tool for vibration and load measurements, combined in a systems approach with an automated surface system. Different indicators such as vibrations, loads and ROP that are traditionally used for stringer detection have been analyzed in the development phase of the algorithm. High-frequency torsional oscillations (HFTO) have been found to be a leading indicator for stringer drilling: HFTO is a torsional vibration phenomenon with high frequencies (50Hz-450Hz) and is only excited by the bit-rock interaction in hard formations. The HFTO amplitudes in sand/lime stones and calcite stringers show well separated distributions. Finally, HFTO is unique in that it is not directly affected by the driller, or due to other downhole dysfunctions, e.g. compared to a change in weight on bit (WOB) which may be caused by a surface parameter change or a stabilizer. The physics-based algorithm embedded in the MWD tool combines tangential acceleration and dynamic torque measurements to calculate the maximum HFTO load in the BHA. A stringer is identified if an HFTO maximum amplitude threshold is exceeded and the energy is localized in one frequency. The downhole indicator is aggregated to a 1-bit value (stringer/no stringer) that enables a high telemetry update rate and thereby a timely reaction at surface. The stringer indicator and advice are displayed to the driller and are actively used for stringer drilling. The paper describes the technology as well as the operational setup, and experience from the first field deployments. By using the new technology, the driller can react faster to any stringer and use appropriate parameters to avoid costly HLDs. First field deployments demonstrate a significant improvement in invisible lost time (ILT) caused by deflections of the bit, resulting in a considerable reduction in well delivery costs.

Simulation and Testing of an Isolator Tool for High-Frequency Torsional Oscillation

2018 ◽  
Author(s):  
Dennis Heinisch ◽  
Vincent Kulke ◽  
Volker Peters ◽  
Andreas Hohl ◽  
Cord Schepelmann ◽  
...  
Keyword(s):  
High Frequency ◽  
Torsional Oscillation

Drill Bit Design Features that Initiate and Reduce High Frequency Torsional Oscillations

2021 ◽  
Author(s):  
Reed W. Spencer ◽  
John A. Bomidi ◽  
Xu Huang
Keyword(s):  
High Frequency ◽  
Torsional Oscillation ◽  
Low Frequency ◽  
Depth Of Cut ◽  
Drill Bit ◽  
Drilling Rig ◽  
Rock Types ◽  
Frequency Changes ◽  
Tangential Acceleration ◽  
Torque Values

Abstract This paper reports the development of and the results of high frequency torsional oscillation (HFTO) tests performed on full-sized PDC drill bits and single cutters in a drilling laboratory. The research team used a pressurized laboratory drilling rig to test different drill bit designs in new and worn conditions. These tests were performed in different rock types, at different revolution per minute (RPM), weight on bit (WOB) and depth of cut (DOC) values. High frequency drill stem torque (5120 Hz) and in-bit tangential acceleration (1400 Hz) data were recorded, along with all other drilling parameters. Spectrograms of torque data were plotted to identify frequency changes in time. The torque data was filtered to remove the low frequency behavior and focus on the HFTO behavior. The high frequency torque signal correlates well with in-bit tangential accelerations. Root mean square (RMS) values of this filtered torque signal were calculated and plotted vs average WOB, depth of cut, and torque values. Sharp and worn bit geometry, were dull graded on a per cutter basis and were input to a 3D drilling modeling software and correlated with test data in order to determine the DOC at which wear flats or cutting faces engage the rock and cause changes in HFTO behavior. The main results from this research are 1) a lab test and data analysis were developed that can measure a drill bit's propensity to initiate HFTO vibrations in the BHA, 2) HFTO RMS high-pass filtered torque values generally increase with DOC, 3) bits in the new state show more HFTO behavior if cutter design is more aggressive, and 4) wear flat engagement causes high HFTO behavior.

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