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Internship | Microfracture Modelling In Cement Of CCS Wells

Stage Utrecht, NL
Geplaatst 14 jun. 2021

Soort opleiding

Bachelor

Functie

Onderzoek

Taalvereiste

Engels (Vloeiend)

Werkervaring

0 tot 1 jaar

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Internship | Microfracture Modelling In Cement Of CCS Wells

Utrecht

Full-time


The success of CCS is critically dependent on preventing any leakages. Microfractures in the cement between the wellbore and the rock could form an important risk. We perform numerical modelling to understand them better.


WHAT WILL YOU BE DOING?

The complete temperature and pressure field during CO2 injection for CCS can be reasonably well calculated. We have many models available for that – as long as the input is available. The behavior of the cement between well tubing and reservoir rock, however, is not so well known. And indeed, it can be one of the weaker barriers against leakage. This is related to the large pressure and temperature changes that my induce microcracks. The microcracks are possible pathways for leakage along the well trajectory.


We want to improve our understanding of these processes through numerical modelling. The input pressures and temperatures are quite well known, but better understanding is warranted of the two-phase flow behavior in these micro-annuli and their mechanical response to those temperatures and pressures. We started a finite-element workflow to simulate this. In the present project, this workflow will be extended, calibrated and applied to a design field case. We expect a one-way coupling to suffice as well leakage should not impact reservoir pressure/tubing conditions much. The model could take into account the impact of creeping formations, and casing eccentricity.


An essential model result is the aperture of the microannulus along the thickness of the caprock through the life of the well. This output then will be input in analytical or numerical methods that calculate the transient CO2 leakage rate along the casing, across the caprock, over the life of the well. The complicated behavior of CO2 requires the use of a two-phase, 2-component model, including evaporation or CO2 dissolution in water.


The project focuses on a particular field case but the tool should be applicable to any other CCS project.

WHAT DO WE REQUIRE OF YOU?

We are looking for an enthusiastic student with background in earth sciences, with affinity with physics models and mathematics, and experience in programming and numerical modelling.

WHAT CAN YOU EXPECT OF YOUR WORK SITUATION?

The main location where the student will be working will be in the Applied Geoscience department. This is a busy department with many projects across the department borders and projects from outside TNO in many application areas, like geothermal energy, CO2 storage, gas production risks, etc.

WHAT CAN TNO OFFER YOU?

You want to work on the precursor of your career; an internship gives you an opportunity to take a good look at your prospective future employer. TNO goes a step further. It’s not just looking that interests us; you and your knowledge are essential to our innovation. That’s why we attach a great deal of value to your personal and professional development. You will, of course, be properly supervised during your internship and be given the scope for you to get the best out of yourself. Naturally, we provide suitable internship compensation.

Delen:

Innovation with purpose: that is what TNO stands for. We develop knowledge not for its own sake, but for practical application.
TNO connects people and knowledge to create innovations that boost the competitive strength of industry and the well-being of society in a sustainable way.
Do you want to do ground-breaking work in multidisciplinary projects, seek out new knowledge? Do you want...


Innovation with purpose: that is what TNO stands for. We develop knowledge not for its own sake, but for practical application.

TNO connects people and knowledge to create innovations that boost the competitive strength of industry and the well-being of society in a sustainable way.

Do you want to do ground-breaking work in multidisciplinary projects, seek out new knowledge? Do you want to help customers with innovative, practical and smart solutions? Are you ambitious and energetic, a thinker and a doer? Then check out our possibilities.

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