From left Ulf Jakob F. Aarsnes (IRIS) and Prof. Florent di Meglio (Mines ParisTech).

A travelogue from a DrillWell postdoc

17.03.2017

Ulf Jakob F. Aarsnes, a postdoc at DrillWell and IRIS, is shearing his experiences from his collaborations with other universities, together with some of the research results extracted from these visits.

University of Calgary
I visited Prof. Roman Short at the University of Calgary for one week in September. Roman has significant experience in both working with sophisticated mathematical descriptions of the drill string and the actual field practices. This has enabled us to corroborate mathematical analysis with field data to derive application oriented results within the technically challenging problem of stick slip.

Stick slip is usually considered a phenomenon of bit-rock interaction, but is also often observed with the bit off bottom. In our work, we present a distributed model of a drill string with an along-string Coulomb friction to investigate the effect of borehole inclination and borehole friction on the incidence of stick-slip. To isolate the effect of this distributed friction, we consider datasets with where the drill string rotation is restarted off bottom after a connection. High frequency field data from two deviated wells with surface and downhole sensors were used.

This collaboration has so far resulted in one Journal paper and two conference paper submissions on this topic.

ulfjakob

Banff national park outside Calgary. From left. Prof. Giovanniantonio Natale (UofC), Madeleine Natale (UofC), Prof. Roman Shor (UofC) and Ulf Jakob F. Aarsnes (IRIS).

Mines ParisTech
I spent October through December 2016 visiting Prof. Florent di Meglio at Mines ParisTech. Florent di Meglio is an expert on analysis, estimation and control of distributed dynamic systems. We want to leverage this expertise to make novel contributions on topics within drilling where the distributed nature of the system is essential to the qualitative behavior of the system, and consequently cannot be ignored. Such distributed behavior is exhibited in the gas-liquid flow and cuttings transport in a well, and in drill string vibrations.

Ongoing research collaborations include:

Modeling and estimation of transient cuttings transport
- Apply distributed transient cuttings transport model to closed loop estimation.
- Leverage expertise in estimation of distributed systems at to make contribution on this topic.
Drill string vibrations
- Torsional and axial vibrations likely to require description of the distributed interaction between the drill string and borehole as well as the bit-rock interaction.
- Analysis can yield insight on mechanism for instability and prediction of occurrence.
Automated pressure control of two-phase flow in pipes
- Distributed descriptions incorporating delay effects are required to analyze robustness and performance of control structures for pressure control two phase flow.

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