Damping lateral vibrations of drill strings

Over the last decades the costs of drilling oil and gas wells have soared. One of the ways to reduce drilling costs is to drill the wells at a faster rate. This can be done by changing operational parameters, like the rotational velocity of the drill string or the weight on the bit. However, increasing these parameters can lead to violent vibrations down hole. The most significant, and least investigated, type of vibration is whirling. Whirling is the lateral vibration of a drill string. Especially backward and chaotic whirling (see Figure) can cause major damage to the drill string components. A solution has been invented to prevent these violent types of whirling from developing. This proposed solution is further investigated computationally, supported by experiments.

Subject

drillstring

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Embargo date

2025-07-01

Part of collection

Student theses

Document type

master thesis

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file embargo until 2025-07-01