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An approach to improve wellbore stability in active shale formations using nanomaterials

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Petroleum 2021年第1期7卷 24-32页

作者： Raoof Gholami Arshad Raza Minou Rabiei Nikoo Fakhari Punissha Balasubramaniam Vamegh Rasouli Ramasamy Nagarajan Department of Petroleum Engineering Curtin UniversityMalaysia Department of Petroleum and Gas Engineering University of Engineering and Technology(UET)LahorePakistan Department of Petroleum Engineering University of North DakotaUSA Department of Chemical Engineering Curtin UniversityMalaysia Department of Applied Geology Curtin UniversityMalaysia

Drilling through active shale formations has been a challenging practice in the oil and gas industry for a long period of time,given the complexity of shale structure and its interaction with Water Based Muds(WBMs).Although there have been many additives and methodologies proposed for a safe drilling through shale formations using WBMs,little success has been reported to the application of these methods once tested under different field *** this paper,a new WBM formulated by nanomaterials was proposed to stabilize active shale layers during drilling.A series of rheological,density,filtration loss,bentonite dispersion and shale recovery tests were conducted on the mud samples formulated by nanosilica and Nano Glass Flakes(NGFs).The results indicated that NGF,as a cheap but effective nanomaterial,is able to significantly reduce the flirtation loss without posing any significant impacts on the density and the rheology of *** also appeared that the bentonite molecules were incapable to either hydrate or disperse in the drilling fluid system in the presence of *** seems that NGFs can stabilize clay minerals and reduce the filtration loss as remarkably efficient additive,but caution must be taken to ensure that they are properly disperse in the WBMs.

关键词： Water based muds Active shale Nano glass flakes Nanosilica Wellbore instability abstract

Compact embedding in Besov spaces and B-separable elleptic operators

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Science China Mathematics 2010年第4期53卷 1067-1084页

作者： SHAKHMUROV Veli B. Department of Electronics Engineering and Communication Okan University

Necessary and sufficient conditions for compactness of sets in Banach space valued Besov class Bp,q s(Ω;E) is *** embedding theorems in Besov-Lions type spaces B l,s p,q(Ω;E0,E) are studied,where E0,E are two Banach spaces and E 0  *** most regular class of interpolation space E α,between E 0 and E are found such that the mixed differential operator D α is bounded and compact from B p,q l,s (Ω;E 0,E) to B p,q s (Ω;E α) and Ehrling-Nirenberg-Gagliardo type sharp estimates *** using these results the separability of differential operators with variable coefficients and the maximal B-regularity of parabolic Cauchy problem are *** applications,the infinite systems of the elliptic partial differential equations and parabolic Cauchy problems are studied.

关键词： embedding theorems Banach-valued function spaces differential-operator equations maximal B-regularity operator-valued Fourier multipliers interpolation of Banach spaces abstract parabolic Cauchy problem

ON BANACH SUPPORT OF AN ERGODIC AND QUASI-INVARIANT MEASURE

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Chinese Science Bulletin 1990年第15期35卷 1233-1236页

作者：杨亚立 Department of Mathematics Shanghai Normal University Shanghai 200234 PRC

Concerning the study of Banach support for the sample space of a random process, the idea can go back to the penetrating investigation of R. Dudley, V.N. Sudaso and X. Fernique, about Gaussian cylindrical measure. Gross, Ito, Sato and J. Kuelbs have investigated Banach support of a measure which, however, considers essentially Gaussian measure and proves that there exists Banach support for ordinary Gaussian measures. The abstract Wieber space introduced by Gross plays an important role in the study of Gaussian process. The ergodic and quasi-invariant measures investigated in this note are much wider than the abstract Wiener spaces, and the results obtained are stronger than the

关键词： quasi-invariant measure abstract Wiener space.

"INDUCTIONLESS INDUCTION" AND RELATIVE COMPLETENESS

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Chinese Science Bulletin 1989年第23期34卷 2011-2014页

作者：林惠民 Institute of Software Academia Sinica Beijing 100080 PRC

I. INTRODUCTION A set of equations, called axioms, defines a variety, i. e. the collection of models models satisfying these equations. The completeness of the first-order equational logic states that an equation is t... 详细信息

关键词： abstract data types algebraic specifications inductionless induction relative completeness

Neurocognitive sequelae of cerebral malaria in adults: A pilot study in Benguela Central Hospital, Angola

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