Institute of Dynamics and Vibrations Drill String … Drill String Dynamics... · Institute of...
Transcript of Institute of Dynamics and Vibrations Drill String … Drill String Dynamics... · Institute of...
Prof. Dr.-Ing. habil. G.-P. Ostermeyer
Technische Universität Braunschweig, Germany
Institute of Dynamics and Vibrations
Drill String Dynamics Group
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Our Approach to Solving Your Problems
We consider and investigate the complex matter of drill string dynamics using various time and size
scales, as well as problem-specific model complexity, and a flexible, modular model setup.
Our models range from complex to reduced models and down to minimal models (with real-time
capability), all equipped to represent the complete drill string, as well as individual parts of interest (e.g.,
bit models).
Using standard methods
as well as our own
innovative simulation
techniques, we are able to
simulate all dynamic
effects, e.g., stick-slip,
whirl, bit-bounce and
durability-relevant load
spectra
The OSTrator supports
experiments that generate
dynamic effects, making it
suitable both in practice
(e.g., control techniques),
and as an education tool.
Measurement data
treatment and analysis. Simulation
Modeling
Analysis
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group |
We are always focused on keeping these three fields closely connected. Experimental data originating from
our test stands, as well as post-processed (downhole) measurements can be used for validation.
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Minimal Models • Stick-Slip
• Whirl
Particle Simulations • cutting transport or
• flow and friction simulations
are feasible
Full Models
String-Mud-Interaction • lateral damping
• virtual string mass
Frictional Contacts • torque and drag
• polymer friction
Algebraic Models • Stick-Slip
• Whirl
Modeling – Complexity and Techniques
Su
bsyste
m
Fu
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yste
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Abstract Models Physical/detailed Models
Ab
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tio
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Ap
pro
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ati
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2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group |
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Do you have questions concerning the dynamic phenomena and mechanical loads of your drill string? We
offer problem-adapted models and efficient simulation strategies!
Input
• Drilling Process
• Wellbore Geometry
• Drill String Setup
• BHA
• Mud
• Formation
• Temperature
• Pressure
• Wear (especially bit)
• Tripping Time
Output
Prediction and Mitigation
of Dynamic Phenomena
• Whirl
• Stick-Slip
• Bit-Bounce
Stability Thresholds
• Buckling
• Snaking
Load Power Spectra
Loads for Fatigue Analysis
• Average loads
• Peak loads
• Lifetime estimations
Drill String / BHA Design
Recommendations
Pre-Well Analyses
Rate of Penetration (ROP)
Model
Our modeling team offers interdisciplinary modeling expertise.
Our major strength is providing models that are specially tailored to your requirements.
minimized computational effort
maximized relevance of results
Short-Term Dynamics Long-Term Dynamics
adjustable
complexity
Modeling – Input and Output
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group |
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• Time / Frequency Domain Simulations
• Multi Body Systems (MBS)
• Finite Element Method (FEM)
• Real-Time Capability (HDL)
• Reduction Techniques
• Complex Drill String Setup
• Complex BHA Setup
• Complex Wellbore Geometry
• Contact Models incl. Formation Data
• Post Processing
Buckling
Simulation Techniques
Simulation – Techniques and Results
Post Processing
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group |
Analyses of Results
Online-Simulation of MBS and Complex FE-Models
Stability Maps
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Simulation
Examine all important drill
string effects under various
conditions:
forward and backward whirl,
stick-slip, Eigenmodes,
buckling, snaking, straight /
curved / inclined wellbores,
high or low friction stabilizers
and bits.
Control / Automation
Optimize drilling performance.
Explore mitigation and control
strategies. Cost-effective
feasibility studies.
Training
Learn through experience.
Gain understanding of complex
behavior in an easy way.
Analysis Our competences in
drilling mechanics enable
us to professionally treat,
analyze and interpret field
data e.g., for mechanical
failure detection or
operation optimization.
Monitoring
Develop failure prediction
and monitoring algorithms
for reduction of non-
productive time.
Problem-Specific Development
Do you have a special question,
problem or request? We will
gladly extend our test stand meet
your needs.
Analysis – Experiment
Mini-Rig OSTrator Data Evaluation
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group |
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Our Offer to You
Modeling, Simulation and Analysis:
Are you looking for theoretical scientific support, tailored models, innovative simulation techniques,
advanced measurement data analyses, or experimental analyses to maximize drilling performance,
minimize failure rates, and reduce drilling cost?
Our team’s R&D services provide you with insights and solutions to help you accomplish your objectives.
Short-Term Projects:
Do you need short-term support on a well-defined problem, e.g., from an ongoing development
project? We have the methodical expertise and equipment needed to solve your problem by means of
simulation, experiment, and/or measured data analysis.
Research Projects:
Are you interested in a long-term collaboration to tackle a challenging scientific problem? We are
pleased to define an individually-tailored project plan together with you. In this mode of collaboration,
a scientist from our institute works full-time on the defined problem for at least one year. He or she has
full access to the experience and equipment of our team and, optionally, works with your team on-site
for reasonable periods of time.
We would be pleased to prepare an individual quote
based on your request.
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group |
Your contact:
Prof. Dr.-Ing. habil. G.-P. Ostermeyer
TU Braunschweig
Institute of Dynamics and Vibrations
Schleinitzstraße 20
D-38106 Braunschweig, Germany
Tel. +49 (0) 531 391-7000
Fax +49 (0) 531 391-7017
www.ids.tu-braunschweig.de