PhD position: Improving reservoir souring treatments for chalk formations in Kongens Lyngby, Denmark

at Technical University of Denmark
Location Kongens Lyngby, Denmark
Date Posted November 20, 2018
Category Reservoir Engineer
Job Type Permanent

Description

PhD position: Improving reservoir souring treatments for chalk formations

The Danish Hydrocarbon Research and Technology Centre, Technical University of
Denmark (DTU), invites applicants for a multisicipline PhD position in the area of numerical modelling of biological proccesses in the subsurface.

Responsibilities and tasks
Biological hydrogen sulphide production in subsurface reservoirs and pipelines is an
unfavourable phenomenon as leads to higher operational costs. The produced hydrogen sulphide is a toxic gas leading to health and safety issues; it also enhances infrastructure corrosion among other negative effects. Souring in such systems is mainly due to
respiration of anaerobic microorganisms (sulphate-reducing prokaryotes, SRP) that
reduces sulphate to sulphide. These microorganisms may exist indigenously in the
reservoirs or/and may be introduced into the system during drilling and waterflooding.
Utilising seawater for waterflooding provides additional sulphate and SRP in the system. The main strategies to reduce the probability of souring are: injecting nitrate and/or
nitrite to inhibit SRP activity and/or oxidize sulphide; removing sulphate from injection
water; and biocide treatments.

Controlling the microbial souring by injecting nitrate to shift the indigenous microbial community away from sulfide production has become an established method. However, to predict and design the cost effective long-term strategies for the souring control process
more work is needed. The reliable quantification of the mechanism of different treatments under altered reservoir conditions is still a challenge and requires more examinations.
The effects of altered reservoir conditions, fractures, reservoir heterogeneity, bio-

availability, self-inhibition, among others, on the souring control process have not been
studied in detail in chalk reservoirs. Detailed reservoir simulations incorporating all the
relevant available information are required to predict the success of various treatment
options while reducing the uncertainties.

The PhD student will develope numerical models for coupled proccesses in chalk
formations. He/She will investigate the interaction among different hydraulic, chemical
and biological processes controlling the flow dynamic in the reservoirs. A thorough
sensitivity analysis on the effect of different mechanisms on the microbial growth and
hydrogen sulphide production at different scales will be conducted to identify the most
influential parameters. This will be then tested for data measured for the targeted field.
The position will be an integrated part of the Scale & Corrosion programme with the focus on improving well integrity. The PhD project involves also field studies.
Qualifications

M.Sc. degree in engineering or other relevant areas;
Excellent Knowledge of the fundamentals of multiphase flow and transport in porous media;
A good knowledge of geomicrobiology and applied mathematic is very valuable.
Previous experience with devloping numerical codes for reactive transport models is highly advantageous.
Ability to work in a multi-disciplinary environment as an independent researcher;
Good writing and communication skills in English;
Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval, and the candidate
will be enrolled in one of the general degree programmes at DTU. For information about
our enrolment requirements and the general planning of the PhD study programme,
please see the DTU PhD Guide.
We offer

DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in
an international environment. We strive for academic excellence in an environment
characterized by collegial respect and academic freedom tempered by responsibility.

Salary and appointment terms

The appointment will be based on the collective agreement with the Danish
Confederation of Professional Associations. The allowance will be agreed upon with the relevant union.
The period of employment is 3 years.

You can read more about career paths at DTU here.
Further information
Further information may be obtained from Dr. Hamid Nick, hamid@dtu.dk
You can read about the scientific basis for the centre’s activities here:
www.oilgas.dtu.dk/english/Research
Application procedure:

Please submit your online application no later than 12 December 2018. Apply at
www.career.dtu.dk
Applications must be submitted as one pdf filecontaining all materials to be given consideration. To apply, please open the link "Apply online," fill in the online application form, and attach all your materials in English in one pdf file. The file must include:
Application stating your specific interest, motivation and qualifications for the project.
Curriculum vitae
Research statement and names and addresses of three references
Authorized copies of BSc and MSc degree diplomas, and transcript of grades (an official translation into English). Excel sheet with translation of grades to the Danish grading system (see guidelines and Excel spreadsheet here )
Candidates may apply prior to obtaining their master's degree, but cannot begin before
having received it.
All interested candidates irrespective of age, gender, race, disability, religion or ethnic
background are encouraged to apply.
About the employer
DTU is a technical university providing internationally leading research, education,
innovation and scientific advice. Our staff of 6,000 advance science and technology to
create innovative solutions that meet the demands of society, and our 11,200 students are being educated to address the technological challenges of the future. DTU is an
independent academic university collaborating globally with business, industry, government and public agencies.
Areas of Research
Applied Mathematics
Hydrology
Clinical Toxicology

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