Alexis Koulidis, Ph.D.

Alexis Koulidis, Ph.D.

Publications

Journal Articles

  1. Koulidis, A., Bloemendal, M., & Vardon, P. J. (2026).
    Experimental Assessment of Sealing Integrity of Grouts and Clay Pellets Under Thermal Cycles Representative of HT-ATES Operation.
    Geothermal Energy.
    DOI

  2. Bruhn, D., Abels, H., Barnhoorn, A., …, Koulidis, A., et al. (2026).
    An Urban Energy Laboratory for Monitoring and Better Understanding of Subsurface Processes Related to Low-Enthalpy Geothermal Heat Production – UrbEnLab.
    Scientific Drilling.
    DOI

  3. Koulidis, A., Grubben, T. M., van der Schans, M., Bloemendal, M., & Vardon, P. J. (2025).
    The Impact of Bridging Additives on Wellbore Strengthening in Shallow Unconsolidated Formations.
    Groundwater Journal.
    DOI

  4. Koulidis, A., Ooi, G., & Ahmed, S. (2024).
    Application of Artificial Intelligence to Predict Rock Strength and Drilling Efficiency Using In-Cutter Sensing Data and Vibration Modes.
    Journal of Petroleum Exploration and Production Technology.
    DOI

  5. Skenderija, J., Koulidis, A., Sorgun, M., & Ahmed, S. (2024).
    Improved Cuttings Transport in Horizontal Wells: An Experimental Study Using a Clamp-on Tool for Efficient Hole Cleaning.
    Arabian Journal for Science and Engineering, 49, 9027–9042.
    DOI

  6. Koulidis, A., Pelfrene, G., & Ahmed, S. (2024).
    Experimental Investigation of Rock Cutting Process and Derivation of 3D Spatial Distribution of the Formation Strength Using In-Cutter Sensing.
    Journal of Petroleum Exploration and Production Technology, 14, 365–380.
    DOI

Journal Articles in Preparation

  1. Grubben, T. M., Koulidis, A., Bloemendal, M., Hartog, N., Muraro, S., & Vardon, P. J. (2026).
    The role of shear dilation in the stability of boreholes in unconsolidated sands.
    Geomechanics for Energy and the Environment. Submitted.

  2. Koulidis, A., Vardon, P. J., & Bloemendal, M. (2026).
    Lithology Prediction and Screen Placement Advisory for ATES and Groundwater Wells Using Drilling Data and Artificial Neural Networks.
    In preparation.

  3. Koulidis, A., de Vries, E., van der Schans, M., Vardon, P. J., & Bloemendal, M. (2026).
    Evaluating Enzyme-Treated PAC-Based Drilling Fluids for Well Development Using Advanced Experimental Methods.
    In preparation.

  4. van der Schans, M., Koulidis, A., de Vries, E., Bloemendal, M., & Vardon, P. J. (2026).
    Novel Return Permeability Tests: The Effect of Drilling Additives on Wells for High-Temperature Aquifer Thermal Energy Storage (HT-ATES).
    In preparation.

Peer-Reviewed Conference Articles

  1. Daniilidis, A., Abels, H., …, Koulidis, A., et al. (2026).
    Delft Subsurface Energy Laboratory – DSUEL: update on research efforts.
    World Geothermal Congress.

  2. Koulidis, A., Laumann, S., & Vardon, P. J. (2026).
    Comprehensive Assessment of the DEL-GT-02 Drilling Operations at TU Delft Campus.
    World Geothermal Congress.

  3. Koulidis, A., van der Schans, M., Bloemendal, M., & Vardon, P. J. (2026).
    Drilling Challenges and Solutions for HT-ATES Systems in Deep Aquifers.
    World Geothermal Congress.

  4. Vardon, P., Abels, H., Bloemendal, M., …, Koulidis, A., et al. (2025).
    A Deep Monitoring Borehole for Subsurface Processes in Low-Enthalpy Sedimentary Geothermal Systems.
    Europe Geothermal Congress.

  5. Koulidis, A., Bloemendal, M., & Vardon, P. J. (2025).
    Long-Term Thermal Heating and Cooling: An Experimental Analysis of Grouting Behaviour for HT-ATES Systems.
    Europe Geothermal Congress.

  6. Bloemendal, M., Koulidis, A., Hashemi, A., van der Schans, M., et al. (2025).
    High-Temperature Aquifer Thermal Energy Storage (HT-ATES) system for research development and demonstration on the TU Delft campus.
    Europe Geothermal Congress.

  7. Koulidis, A., Skenderija, J., & Ahmed, S. (2023).
    Drilling Monitoring System: Mud Motor Condition and Performance Evaluation.
    In: SPE Middle East Oil, Gas and Geosciences Show.
    SPE-213422-MS.
    DOI

  8. Skenderija, J., Koulidis, A., Sanchez, D., & Ahmed, S. (2023).
    Advanced Hole Cleaning in Horizontal Wells: Experimental Investigation Supported by a Downhole Clamp-on Tool.
    In: SPE Middle East Oil, Gas and Geosciences Show.
    SPE-213675-MS.
    DOI

  9. Koulidis, A., & Ahmed, S. (2023).
    Advisory System for Drilling Optimization Using Artificial Intelligence and In-Cutter Sensing Data.
    In: SPE AI Symposium.
    SPE-214468-MS.
    DOI

  10. Koulidis, A., Zhan, G., & Ahmed, S. (2022).
    Embedded Force Sensing At The Cutter.
    In: SPE Abu Dhabi International Petroleum Exhibition & Conference (ADIPEC).
    SPE-211511-MS.
    DOI

  11. Koulidis, A., Ooi, G., Skenderija, J., & Ahmed, S. (2022).
    Drilling Data Quality and Reliability: A Novel Algorithm for Data Correction and Validation.
    In: SPE International Petroleum Technology Conference.
    SPE-22123-MS.
    DOI

  12. Koulidis, A., Abdullatif, M., Abdel-Kader, A. G., Ayachi, M. I., Ahmed, S., Gooneratne, C., Magana-Mora, A., Affleck, M., & Alsheikh, M. (2021).
    Field Assessment of Camera-Based Drilling Dynamics.
    In: SPE Middle East Oil & Gas Show & Conference.
    DOI

  13. Skenderija, J., Koulidis, A., Kelessidis, V., & Ahmed, S. (2021).
    Application of a Drilling Simulator for Real-Time Drilling Hydraulics Training and Research.
    In: Middle East Oil & Gas Show & Conference.
    SPE-204579-MS.
    DOI

  14. Koulidis, A., Mohammed, F., & Ahmed, S. (2021).
    Micromechanics of Drilling: A Laboratory Investigation of Formation Evaluation At The Bit.
    In: SPE Middle East Oil & Gas Show & Conference.
    SPE-204670-MS.
    DOI

  15. Koulidis, A., Kelessidis, V., & Ahmed, S. (2021).
    Exploitation of Field Drilling Data With An Innovative Drilling Simulator: Highly Effective Simulation Of Rotating And Sliding Mode.
    In: SPE/IADC Middle East Drilling Technology Conference and Exhibition.
    SPE-202176-MS.
    DOI

  16. Abdel-Aal, M. A., Mohamed, F. M., Abdelkader, A. G., AbdulLatif, M. A., Koulidis, A., & Ahmed, S. (2020).
    Development and Field Testing of a Novel Multifunctional Drilling Enhancement Tool in a Middle East Field.
    In: SPE International Petroleum Technology Conference.
    20IPTC-19745-MS.
    DOI

  17. Kelessidis, V., Ahmed, S., & Koulidis, A. (2015).
    An Improved Drilling Simulator for Operations, Research and Training.
    In: SPE 19th Middle East Oil & Gas Show & Conference.
    SPE-172793-MS.
    DOI

Book Chapters

  1. Koulidis, A., & Ahmed, S. (2024).
    Positive Displacement Motor Condition and Performance Prediction Using Surface and Downhole Sensor Data.
    In S. Irawan (Ed.), Exploring the World of Drilling (1st edition). IntechOpen.
    DOI

Conference Abstracts

  1. Fremouw, M., Koulidis, A., & Bloemendal, M. (2026).
    Assessing and Designing a Pilot Aquathermal System on the TU Delft Campus.
    EGU General Assembly.

  2. Grubben, T. M., Koulidis, A., van der Schans, M., Bloemendal, M., Hartog, N., & Vardon, P. J. (2025).
    On the Existence of Stable Boreholes in Sand.
    International Conference on Energy Geotechnics.

  3. Vardon, P. J., van der Schans, M., Koulidis, A., Grubben, T. M., Beernink, S. T. W., & Bloemendal, M. (2024).
    High-Temperature Aquifer Thermal Energy Storage Research and Demonstration Project in Conjunction with Geothermal Energy.
    EGU General Assembly.

  4. Bloemendal, M., van der Schans, M., Koulidis, A., Grubben, T. M., Beernink, S. T. W., Hartog, N., & Vardon, P. J. (2023).
    Breaking Technological Grounds for Heat Storage.
    DAP (Geothermal) Symposium.