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• W4253215411 abstract "Rock-Drilling Fluid Interaction Studies on the Diffusion Cell Eudes Siqueira Muniz; Eudes Siqueira Muniz Pontificia U Catolica Search for other works by this author on: This Site Google Scholar Sergio A.B. Fontoura; Sergio A.B. Fontoura Catholic U. of Rio de Janeiro Search for other works by this author on: This Site Google Scholar Rosana Fatima Teixeira Lomba Rosana Fatima Teixeira Lomba Petrobras S.A. Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Latin American and Caribbean Petroleum Engineering Conference, Rio de Janeiro, Brazil, June 2005. Paper Number: SPE-94768-MS https://doi.org/10.2118/94768-MS Published: June 20 2005 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Muniz, Eudes Siqueira, Fontoura, Sergio A.B., and Rosana Fatima Teixeira Lomba. Rock-Drilling Fluid Interaction Studies on the Diffusion Cell. Paper presented at the SPE Latin American and Caribbean Petroleum Engineering Conference, Rio de Janeiro, Brazil, June 2005. doi: https://doi.org/10.2118/94768-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Latin America and Caribbean Petroleum Engineering Conference Search Advanced Search AbstractThis paper presents a new set of rock-drilling fluid interaction tests carried out in the diffusion cell using saline solutions and mineral oil on a Brazilian offshore shale. The diffusion cell was designed to apply hydraulic and chemical gradients through shale samples in order to evaluate shale-fluid interaction. The proposed test allows the determination of rock permeability, the coefficient of reflectivity (membrane efficiency) and the ionic diffusion coefficient. These parameters are essential to carry out proper wellbore stability analysis when taking shale-drilling fluid interaction into account. Shale characterization, testing methodology and test results are described. The results showed an average permeability of 46 nD and membrane efficiency less than 2 % for the tested shale.IntroductionDrilling through shales has presented serious problems of instability and most of them have been attributed to interaction between this rock and the drilling fluid. Normally, long periods of time are necessary to solve some of these problems and that contributes to raise drilling costs. 10-years old data, [1], indicate that nearly 30 % of the additional costs during drilling operations are caused by wellbore instabilities and from these, almost 90 % occur during drilling through shales. These problems used to consume more than US$ 500 million per year considering the technology available then. Much has been learned since then, and that allowed the successful drilling of highly inclined wells with the use of a new generation of drilling fluids. However, on average, the losses are still quite high and there is much to be done to transform the research results into daily practice. The proper selection of the drilling fluid for a given situation is still an issue to be dealt with in drilling operations.The ideal drilling fluid concerning stability of wells must keep the confining effective stresses around the well high enough to preclude rock failure. This can be achieved by, at least, three distinct manners. Firstly, by avoiding pore pressure increase due to fluid penetration through the use of high-entry pressure fluids, i.e., oil-based-like type of fluid. Secondly, by playing with the osmotic effects caused by water-based, saline fluids. Thirdly, by the use of invert-emulsion fluids, [2], that combine the two previous mechanisms.The pore pressure control, achieved through osmotic effects, can be exercised understanding the concepts and quantifying the processes of mass transport due to hydraulic and chemical gradients. In low permeability rocks, such as shales, these gradients induce changes in pore pressures due to effects of hydraulic and ionic diffusion and osmotic effects that can change with rock capability to restrict ion flux through the formation. This is the most studied topic related to shale-drilling fluid interaction.In spite of the importance of drilling fluid-shale interaction, few experimental studies that mimic drilling fluid contact with shale under partial borehole conditions have been developed around the world, [2–7]. At the same time, some of these studies only present qualitative results about the rock-fluid interactions without obtaining the mass transport parameters necessary in wellbore stability analyses.In order to evaluate shale-drilling fluid interactions, new equipment capable to simulate in situ pressure conditions was developed and presented by Muniz et al. (2004) [8]. In this equipment, hydraulic and ionic gradients can be imposed to a shale sample in order to estimate its permeability, the reflection coefficient (membrane efficiency) and the ionic diffusion coefficient. These parameters are used as input in computer programs that take into account physical-chemical interactions to evaluate wellbore stability.The aim of the present paper is to describe the procedures to evaluate the mass transport parameters, i.e., permeability, ion diffusion and membrane efficiency, of shales. Offshore Brazilian shale was used for the tests. Tests and results using the mercury injection technique and scanning electronic microscopy are presented. The reflection coefficients obtained using the computer program FPORO©, described in reference [9], compared well with the values obtained directly from the experiments. Keywords: shale, wellbore design, upstream oil & gas, spe 94768, coefficient, saline solution, fontoura, fluid interaction, membrane efficiency, shale sample Subjects: Wellbore Design, Drilling Fluids and Materials, Reservoir Characterization, Wellbore integrity This content is only available via PDF. 2005. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4253215411 title " Rock-Drilling Fluid Interaction Studies on the Diffusion Cell " @default.
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