Wellbore stability issues has been a challenge in the recent decades for oil and gas industry due to increased drilling in high temperature and pressure zone. In order to overcome wellbore stability issues it is critical to understand and quantify the mud properties leading to these issues. Characterizing the effects of the mud filter cake, formation damage, and filtration over time using sandstone cores having different permeabilities helps drilling engineers plan a suitable mud design that will promote stability of the wellbore by balancing formation pressures.
Filtrate invasion and mud cake build up can be considered as primary factors controlling wellbore stability while drilling. Decreasing the near wellbore permeability by forming a low permeability mud cake can strengthen the wellbore and mitigate lost circulation problems. Few studies have investigated filtration and filter cake characteristics under high pressure and temperature situations using realistic downhole media
This study focuses on experimental methods to investigate the effects of particle bridging, filtrate invasion and permeability on some common water-based muds used by the industry. The methodology in this paper is based on filtration tests at different time steps on sandstone cores of 15.9 md, 122 md, 423 md, and 1130 md fitted into pore plugging testing apparatus. The scanning electron microscope and elemental mapping was used to characterize filter cake and further investigating the particles invasion in the core samples. Finally, mud cake permeability of the samples was calculated using analytical models from literature.
|Commitee:||Boukadi, Fathi, Guo, Boyun|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 55/03M(E), Masters Abstracts International|
|Keywords:||Drilling fluid, Filtration, Fluid invasion, LCM, Mud cake, PPT, SEM, Wellbore stability|
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