APPLICATION OF A FORCED VIBRATION MODELING APPROACH TO BETTER QUANTIFY THE ROLE OF DOWNHOLE VIBRATIONS AND EXCITATION TOOLS


Drilling operations can induce several external excitations to the drillstring and bottom-hole assembly (BHA) due, namely, to the drillstring-wellbore contacts, bit-rock interactions, fluid flow, and mass imbalances. On the one hand, such undesirable excitations may lead to excessive vibrations and damage to the drill bit, BHA, or drill-pipes.

On the other hand, some vibration tools are used to intentionally introduce a source of lateral vibrations in the drillstring to reduce the friction effects and enhance the rate of penetration. Whether these vibrations are undesirable or intentional, efficient models are necessary to predict them accurately to help optimize the drilling parameters and vibration tools placement in the drillstring.

The time-domain analysis can give a detailed portrayal of drillstring vibrations, but usually requires a lengthy computational time, especially for the simulation of long structures. This paper focuses on an alternative analysis using a forced vibration model based on a linearized frequency analysis.

It consists of studying the magnitude of the displacement, velocity, acceleration, and internal efforts, when the drillstring is subject to an external harmonic excitation at a given frequency. The novelty of this work is in showing the capacities and limitations of the forced vibration analysis compared to time-domain analysis.

The fast computation of the frequency analysis can provide efficient and accurate predictions and, therefore, could be employed to optimize the BHA design and drilling parameters, and therefore reduce the harmful vibrations and improve the performance of any drilling systems equipped with downhole excitation tools. To learn more about us, visit here: https://www.helmerichpayne.com/resources/technical-publications/application-of-a-forced-vibration-modeling-approach-to-better-quantify-the-role-of-downhole-vibrations-and-excitation-tools or you can also contact us here: https://www.helmerichpayne.com/contact.

Comments

Post a Comment

Popular posts from this blog

DrillScan® Digital Solutions PRESENTS Advanced Well Engineering - Tailored software for smarter, efficient, failure-proof drilling!

Image
  HOW WE HELP We accelerate well delivery and maximize well lifespan for energy operators through physics-based modeling and drilling expertise AWE offers constant performance improvement for the client by leveraging the extensive experience of our engineering team and DrillScan® digital solutions. BitScan™ Software for auto processing, validation & export of PDC models. WellScan ® Advanced suite for quick and accurate well engineering.   LiveScan™ & REST APIs Integrated real-time solution for drilling monitoring & optimization. WHO WE ARE A century of achievement. A reputation of excellence. We are a drilling engineering and R&D team renowned for pioneering the development and implementation of industry-leading physics-based models. DRILLSCAN DIGITAL SOLUTIONS Enhance drilling engineer performance with precise digital solutions. ADVANCED WELL ENGINEERING Premium engineering ...
Read more

MAGVAR™ OMNI TECHNOLOGY

Image
  Achieve Unmatched Accuracy MagVAR™ Omni technology elevates standard surveying practices by delivering more precise wellbore trajectory and shape. By integrating our survey correction services with continuous inclination measurements, it helps ensure exceptional accuracy in both lateral and vertical positioning. This enhanced mapping provides valuable insights into the trajectory and configuration of your well to help you reach your intended geological target with confidence. A comprehensive understanding of the wellbore trajectory and shape can: ·        Facilitate strong agreement between geologic & drilling teams ·        Minimize positional errors ·        Identify tortuosity ·        Improve wellbore quality ·        Improve Geology-Drilling data ·        Reduce costly re-drills ·  ...
Read more

DRILLSCAN® SOFTWARE IDENTIFIES DRILLING DYSFUNCTION CAUSES IN COMPLEX, MULTILATERAL ERD WELL

Image
An operator in the North Sea faced a lower completion lock-up 800m above total depth (TD), followed by a stuck pipe event in an ERD multi-lateral well. In an initial effort to push the completion down to TD, all slack off weight and torque margin were used. Since no improvement was observed, the decision was made to pull-out. However, the string remained stuck and despite the rig efforts to free it, the lower completion had to be cut and left in hole. H&P’s DrillScan® technology team performed an in-depth post-analysis, reviewing all available data to identify what might have caused the lock-up event. The data provided was used to simulate the downhole conditions undergone by the completion with the DrillScan genuine stiff-string model. The results and conclusions pointed to string dysfunctions: suboptimal tripping and lubricating/ backreaming practices (BHA POOH) led to repeatedly exceeding the screens yield strength (lower completion RIH). H&P’s DrillScan software was a...
Read more