Mathematical Modeling of Gas in Riser
Ulf Jakob Aarsnes, Espen Hauge, John-Morten Godhavn
Source abstract
Abstract A mathematical model which describes the dynamics of gas being circulated out of a riser is presented. The model is valid for conventional drilling where no backpressure is applied, controlled mud level (equivalent to dual gradient drilling), managed pressure drilling with backpressure, and with a riser gas handler. The presented model is validated with data from a field trial where gas was circulated down the drillstring and into an open riser with a reduced riser liquid level (controlled mud level). Underlying assumptions makes the models conservative. The model is suited to evaluate the procedures for use of a riser gas handler, and an example with automatic control of the rig choke shows how a gas kick can be safely circulated from the riser.
Evidence graph
No public relationships recorded yet.
Integrity note: This page is a factual metadata record created by deterministic ingestion. It is not a claim that the work moves a mathematical frontier or has been independently verified.