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Author

Mengjiao Yu

Other affiliations: University of Texas at Austin
Bio: Mengjiao Yu is an academic researcher from University of Tulsa. The author has contributed to research in topics: Drilling fluid & Lost circulation. The author has an hindex of 25, co-authored 148 publications receiving 2316 citations. Previous affiliations of Mengjiao Yu include University of Texas at Austin.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the effects of mechanical forces and poroelasticity on shale behavior are included, as well as chemical and thermal effects, for determining wellbore stability for oil and gas drilling operations.

190 citations

Journal ArticleDOI
TL;DR: Fonseca et al. as discussed by the authors presented a model that combines chemical effects with mechanical effects and provided a quantitative tool for evaluating well-bore stability in shales, where fluxes of water and ions into and out of the shale are accounted for.

89 citations

Proceedings ArticleDOI
01 Jan 2001
TL;DR: In this paper, the authors compared experimental data presented by Ewy and Stankovich [2000] with the model presented in this paper and showed that the relative magnitude of the hydraulic conductivity of the shale, the membrane efficiency of the KII, and the effective diffusion coefficient of solute (Deff) all have an influence on the net pore pressure behavior of a shale exposed to a drilling mud.
Abstract: The model presented in Chapter 2 is compared with experimental data presented by Ewy and Stankovich [2000]. It is shown that the relative magnitude of the hydraulic conductivity of the shale (KI), the membrane efficiency of the shale (KII), and the effective diffusion coefficient of solute (Deff) all have an influence on the net pore pressure behavior of a shale exposed to a drilling mud. After the model has been calibrated with one set of experimental data, excellent predictions under other operating conditions can be made. Good agreement with experimental data is obtained for such predictions.

73 citations


Cited by
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Journal ArticleDOI
TL;DR: The theory of residues conformal mapping has been studied in this paper, where the Laplace transformation is used to define a complex variable infinite series in the complex plane, and the calculus of variations analytic functions of the infinite series is studied.
Abstract: Ordinary differential equations of the first order linear differential equations complex numbers and linear algebra simultaneous linear differential equations numerical methods the descriptive theory of nonlinear differential equations mechanical systems and electric circuits Fourier series Fourier integrals and Fourier transforms the Laplace transformation partial differential equations Bessel functions and Legendre polynomials applications and further properties of matrices vector analysis the calculus of variations analytic functions of a complex variable infinite series in the complex plane the theory of residues conformal mapping.

622 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of mechanical forces and poroelasticity on shale behavior are included, as well as chemical and thermal effects, for determining wellbore stability for oil and gas drilling operations.

190 citations

Journal ArticleDOI
TL;DR: In this article, the authors measured and compared spontaneous imbibition of oil and water into the crushed packs of the similar shales and found that the intact samples consistently imbibe more oil than water.
Abstract: Recent experiments show the strong water uptake of gas shales which are strongly oil-wet based on contact angle measurements.1,2 Clay hydration, microfracture induction, lamination, and osmotic effect are collectively responsible for the excess water uptake. However, the previous measurements are not sufficient to isolate the above factors nor to explain why the bulk of shale samples can hardly imbibe the oil which completely spreads on their surface. To answer the remaining questions, we measure and compare spontaneous imbibition of oil and water into the crushed packs of the similar shales. In contrast to the intact samples, the crushed samples consistently imbibe more oil than water. The comparative study suggests that the connected pore network of the intact samples is water wet while the majority of rock including poorly connected pores is oil-wet. This argument is backed by complete spreading of oil on fresh surfaces of the rock. In contrast to the artificial pores of crushed rock, the existing pore...

175 citations

Journal ArticleDOI
TL;DR: In this article, the applicability of multilwalled carbon nanotube (MWCNT), nanosilica and glass beads (GBs) as primary additives for enhancing the filtrate volume, lubricity and other rheological properties of WBDF was investigated.

173 citations