Institute of Dynamics and Vibrations Drill String Dynamics Group Prof. Dr.-Ing. habil. G.-P. Ostermeyer Technische Universität Braunschweig, Germany
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).
Modeling
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.
Analysis
Simulation
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
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.
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group | Page 2
Modeling – Complexity and Techniques
Subsystem
Physical/detailed Models
Algebraic Models • Stick-Slip • Whirl
Frictional Contacts • torque and drag • polymer friction
Full system
Abstraction / Approximation
Abstract Models
Minimal Models • Stick-Slip • Whirl
Particle Simulations • cutting transport or • flow and friction simulations are feasible
String-Mud-Interaction • lateral damping • virtual string mass
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group | Page 3
Full Models
Modeling – Input and Output 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
Model
Output Short-Term Dynamics
• Drilling Process • Wellbore Geometry • Drill String Setup
Prediction and Mitigation of Dynamic Phenomena
• BHA
• Whirl
• Mud • Formation • Temperature
• Stick-Slip adjustable complexity
Long-Term Dynamics Loads for Fatigue Analysis • Average loads • Peak loads • Lifetime estimations
• Bit-Bounce
• Pressure
Stability Thresholds Drill String / BHA Design • Buckling Recommendations
• Wear (especially bit)
• Snaking
• Tripping Time
Load Power Spectra
Rate of Penetration (ROP) Pre-Well Analyses
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 2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group | Page 4
Simulation – Techniques and Results Simulation Techniques
Online-Simulation of MBS and Complex FE-Models
• 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
Analyses of Results
• Post Processing
Stability Maps
Post Processing
Buckling 2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group | Page 5
Analysis – Experiment Mini-Rig OSTrator
Data Evaluation
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. Problem-Specific Development Do you have a special question, problem or request? We will gladly extend our test stand meet your needs.
Training Learn through experience. Gain understanding of complex behavior in an easy way.
2013 | Prof. Dr.-Ing. habil. G.-P. Ostermeyer | Drill String Dynamics Group | Page 6
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 nonproductive time.
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 | Page 7
Your contact: Prof. Dr.-Ing. habil. G.-P. Ostermeyer
TU Braunschweig Institute of Dynamics and Vibrations
Tel. +49 (0) 531 391-7000 Fax +49 (0) 531 391-7017
Schleinitzstraße 20 D-38106 Braunschweig, Germany
[email protected] www.ids.tu-braunschweig.de