A Multibody Dynamical Model for Full Hole Drillstring Dynamics

“…In recent years, the multi-body dynamics method has been introduced to the rotary drilling system modeling and simulation, and has performed satisfactory results (Yang 2010, Cheng et al 2013.…”

Section: Multi-body Dynamics Modelingmentioning

confidence: 99%

Automated Slide Drilling System and Multi-Body Dynamics Aided Slide Drilling Simulation

Wang

Cheng

Lu³

et al. 2015

SPE Digital Energy Conference and Exhibition

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Drilling automation can replace manual operation with more predictable and consistent computercontrolled drilling process, as well as enhance the digital link between well-site and data center and enable the remote drilling. In this paper, the automation of drilling process is viewed as three hierarchical control loops: the trajectory control loop, the drilling state control loop, and the motor and actuator control loop.The drilling state control loop, which controls the bit attitude, weight on bit (WOB), etc., is pivotal to the trajectory control, and remains a focus of development. The drilling state control loop is composed of three sub-loops, i.e., the surface loop, the downhole loop and the hybrid loop. The surface loop supervises the torque, pressure, and hook load, controls the WOB, and takes actions in emergencies. This loop is being analyzed in auto driller systems, and in managed pressure drilling. The downhole loop controls the directional drilling tools, and is well realized in rotary steerable systems. The hybrid loop, which connects the prior two loops and reinforces one loop with the other, however, is not well developed. A slide drilling system is presented as an example, where no downhole loop holds the bit attitude, and the hybrid loop faces sharpest challenge to control the drilling direction from surface. A joint control of top drive and drawworks is developed to perform coupled control of WOB and toolface. The control system takes into account the desired toolface and WOB. Different operating modes of slide drilling systems are identified and applied with specific control algorithm. The shift between modes is controlled by the operator.The control system is developed and simulated with the aid of multi-body dynamics modelling of the drill string. This drill string simulation model, based on absolute nodal coordinate formulation, receives the control commands for the top drive and drawworks, and outputs the sensor data and the well trajectory. Loads and dynamic response of the drill string are also simulated. Multi-body dynamics method enables real-time full-hole drill string simulation, and is a powerful tool for automated drilling system development.

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“…Experts and scholars had conducted different models [8,9], numerical simulations [10][11][12], and laboratory experiments [13,14] to analyze the dynamic characteristics. Baumgart established an axial vibration model and analyzed the WOB fluctuation phenomenon of drill bit [15].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Study on Motion States of Laboratory-Scale Bottom Hole Assembly in Horizontal Wells

Huang

et al. 2020

Energies

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Motion states of bottom hole assembly (BHA) have a great effect on the trajectory control and drilling efficiency while rotary drilling. In order to study the motion states of BHA in horizontal wells, a BHA dynamic model with the finite element method was established. Meanwhile, an indoor experimental setup based on similarity criterion was designed and built to verify the numerical simulation results. Finally, the effects of measuring positions, rotate speeds, weight on bit (WOB), and friction coefficients on the motion states were analyzed in numerical simulation and experiment. The results show that the experimental results can match well with the numerical simulation results. The motion states of BHA in horizontal wells can be divided into three kinds, including circular arc swing, "8" shape swing, and dot-like circular motion. The circular arc swing mainly appears at middle section of BHA and occurs through the collective result of gravity and tangential friction. The dot-like circular motion mainly appears at near-bit or near-stabilizer area because drill bit and stabilizer can steady the BHA at the center part of the wellbore. The "8" shape swing mainly appears at the crossed area and occurs through collective disturbance of the other two motions. Moreover, rotate speed and friction coefficient have promotions on the lateral vibration while WOB have a much smaller effect. Through analyses, related suggestions are given for the drilling engineering. The related conclusions and suggestions in this paper can help to further understand the lateral dynamic characteristics of BHA in horizontal wells and select suitable parameters for drilling engineering.

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A Multibody Dynamical Model for Full Hole Drillstring Dynamics

Cited by 10 publications

References 10 publications

Nonlinear dynamics of lump mass model of drill-string in horizontal well

Nonlinear dynamics of lump mass model of drill-string in horizontal well

Automated Slide Drilling System and Multi-Body Dynamics Aided Slide Drilling Simulation

Modeling and Experimental Study on Motion States of Laboratory-Scale Bottom Hole Assembly in Horizontal Wells

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