Runar Nygaard, Jesus De Andrade and Arild Saasen

First DrillWell PhD dissertation

26.11.2015

Jesus Alberto de Andrade Correia has completed his Ph.D. dissertation entitled: “Cement Sheath Integrity during Thermal Cycling”.

The evaluation committee has consisted of: Associate Professor Runar Nygaard, Missouri University of Science & Technology, Technology advisor Arild Saasen, Det norske oljeselskap and Adjunct Professor Tor Berge Gjersvik, NTNU. The title of the public lecture was: «Recent advances in lost circulation preventive industry practises including the use of managed pressure drilling systems». The main adviser has been Professor Sigbjørn Sangesland and co-advisers Professor Michael Golan and Senior Researcher Torbjørn Vrålstad, SINTEF Petroleum Research.

Correira's work is addressing potential breach of long term well integrity caused by temperature cycling in the wellbore. He has addressed this problem by developing a novel laboratory set-up to investigate deformations and fractures in a scaled down section of a wellbore under pressurized conditions up to 500 psi confining pressure.

The deformation and failure in the cement sheath is characterized using acoustic emissions events while running the experiments and inspecting the core between the temperature cycles in computer tomography.

The experimental work main contribution is the design, development and construction of this novel testing apparatus. The use of CT scanning as part of this testing is a pioneering work which he contributed to. The experiments conducted gave new insights into the formations of permeable flow paths in the cement sheath. The second main area of investigation in the thesis is numerical modeling of the cement sheath integrity. The main novel contribution of this work is the evaluation of casing standoff effect on cement sheath integrity.

Jesus De Andrade will continue working in NTNU-IPT as a Post Doc on topics related to Well Integrity and Subsea Production Systems.

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