The Fundamental Principles and Standard Evaluation for Fluid Loss and Possible Extensions of Test Methodology to Assess Consequences for Formation Damage

Karl Ronny Klungtvedt, Arild Saasen, Jan Kristian Vasshus, Vegard Bror Trodal, Swapan Kumar Mandal, Bjørn Berglind and Mahmoud Khalifeh
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Karl Ronny Klungtvedt: European Mud Company AS, 4033 Stavanger, Norway
Arild Saasen: Department of Energy and Petroleum Engineering, University of Stavanger, 4021 Stavanger, Norway
Jan Kristian Vasshus: European Mud Company AS, 4033 Stavanger, Norway
Vegard Bror Trodal: Department of Energy and Petroleum Engineering, University of Stavanger, 4021 Stavanger, Norway
Swapan Kumar Mandal: European Mud Company AS, 4033 Stavanger, Norway
Bjørn Berglind: European Mud Company AS, 4033 Stavanger, Norway
Mahmoud Khalifeh: Department of Energy and Petroleum Engineering, University of Stavanger, 4021 Stavanger, Norway

Energies, 2021, vol. 14, issue 8, 1-19

Abstract: Industry testing procedures such as ANSI/API 13B-1 describe a method for measuring fluid loss and studying filter-cake formation against a medium of either a filter paper or a porous disc, without giving information about potential formation damage. Considering the thickness of the discs, it may also be possible to extend the method to gain an insight into aspects of formation damage. A new experimental set-up and methodology was created to evaluate changes to the porous discs after HTHP testing to generate insight into signs of formation damage, such as changes in disc mass and permeability. Such measurements were enabled by placing the disc in a cell, which allowed for reverse flow of fluid to lift off the filter-cake. Experiments were conducted with different drilling fluid compositions to evaluate the use of the new methodology. The first test series showed consistent changes in disc mass as a function of the additives applied into the fluid. The data yield insights into how the discs are sealed and to which degree solids, fibers or polymers are entering the discs. A second series of tests were set up to extend the procedure to also measure changes in the disc’s permeability to air and water. The results showed that there was a positive correlation between changes in disc mass and changes in permeability. The conclusions are that the methodology may enable identifying signs of formation damage and that further studies should be conducted to optimize the method.

Keywords: fluid loss; formation damage; lost circulation; drilling fluids; filter-cake removal (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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