Doctoral dissertation: Asanthi Jinasena

Asanthi Jinasena will have her doctoral dissertation on October 8th: “Models and estimators for flow of topside drilling fluid”

08 Oct

Praktisk informasjon

  • Dato: 8. oktober 2019
  • Tid: kl. 10.00 - 15.00
  • Sted: Campus Porsgrunn, Auditorium B-133 campus Porsgrunn

    Til å bedømme avhandlingen er oppnevnt:

    • Første opponent:  Dr. Marta Dueñas Diez, Repsol Services, USA
    • Andre opponent: Professor emeritus Steinar Sælid, NTNU
    • Administrator av komiteen: Førsteamanuensis André Vagner Gaathaug, USN


    • Hovedveileder for doktorgradsarbeidet har vært førsteamanuensis Roshan Sharma, USN, og biveiledere har vært dr. Glenn Ole Kaasa, Kelda Drilling Controls.



    Kl 10.00 Prøveforelesning

    Tema for prøveforelesning:

    “State-of-the-art of AI in oil & gas production optimization and comparison to traditional methods”

    Kl 13.00 Disputas

    Prøveforelesning og disputas er åpen for alle interesserte. 


About the dissertation

In this thesis, a novel concept for the real-time measurement of return fluid flow rate of oil well drilling process was presented.  A Venturi channel is used as a flow sensor to measure the fluid flow rate.  The developed method is accurate, fast, and can measure the fluid flow rate using only two fluid level measurements from the channel.

For the estimation of the flow rate, various model-based estimators have been studied. This method is specifically useful for the conventional petroleum drilling industry.Ashanti Jinasena - photo

Accurate measurements of the drilling fluid coming out of the drilling well are crucial for identifying any undesired incident such as a kick or a loss during oil drilling.  These incidents can be either prevented or properly controlled by early identification. This can further reduce the risks related to incidents and can decrease the non-productive time.

Although the flow sensor has been studied with application to the oil industry, the results obtained in this Ph.D. study is generic and can be applied to other processes as well. The flow measurement concept has been successfully tested at the single-phase flow experimental facility at USN. The next step would be to test it in a pilot-scale drilling facility.

This research is a part of the project 'Semi-kidd' (sensors and models for improved kick/loss detection in drilling) which is funded by the Research Council of Norway and Equinor ASA. The project is led by USN and consists of external partners including Equinor, NTNU, Kelda Drilling Controls, Cybernetic Drilling Technologies, MHWirth, Sensor Technology, and Teknova.