دورية أكاديمية

Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence

التفاصيل البيبلوغرافية
العنوان: Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence
المؤلفون: Rodrigues, Patricia Evelyn
المساهمون: Batzle, Michael L., Prasad, Manika, Li, Yaoguo, Sava, Paul C., Yang, Yuan, Merkel, Richard
بيانات النشر: Colorado School of Mines. Arthur Lakes Library
سنة النشر: 2007
المجموعة: Digital Collections of Colorado (Colorado State University)
مصطلحات موضوعية: confinement, heavy oils, amplitude dependence, shear modulus, Heavy oil -- Elastic properties -- Measurement, Shear waves, Elastic wave propagation, Rheometers, Viscoelasticity
الوصف: 2014 Spring. ; Includes illustrations (some color), maps. ; Includes bibliographical references (pages 94-99). ; The success of seismic and other acoustic monitoring techniques is based on the ability of geophysicists to accurately model acoustic waves propagation. True "fluids" are not capable of supporting shear stress; however, heavy oils are viscoelastic and allow the transmission of shear waves. The shear modulus of heavy oils is highly dependent on frequency which adds a major difficulty since the data we study are obtained at different frequencies. Measuring elastic properties at high frequencies has been done for many years and it is much simpler than low frequencies measurements; specifically in bulk heavy oils. The equipment deforms the sample at frequencies from 3 to 3000 Hz and it works well for solid-like samples but cannot be used for liquid-like samples. An alternative method to measure the shear modulus of heavy oils at low frequencies is the rheometer which measures the shear modulus at frequencies from 0.01 to 100 Hz with strains amplitudes in the order of 10-4, two or three orders of magnitude larger than tension/compression. Linear viscoelasticity theory indicates that measurements done in the linear viscoelastic regime should be consistent between techniques as elastic properties are independent of amplitude. My research is focused on understanding rheometer measurements, and validating them against the tension/compression technique. However, in this work I identified two aspects of the rheometer that make their measurements not consistent with tension/compression results. The first is the presence of the two solid-liquid interfaces provided by the parallel plates; and the second is the increased strains amplitudes in the rheometer. The solid-liquid interfaces cause reorientation of the surface active components of the heavy oils, increasing the shear modulus near the interface in a scale that can be measured by the rheometer. This was evidenced by an increased of the shear modulus when ...
نوع الوثيقة: text
وصف الملف: born digital; doctoral dissertations; application/pdf
اللغة: English
العلاقة: 2014 - Mines Theses & Dissertations; T 7448; http://hdl.handle.net/11124/413Test
الإتاحة: http://hdl.handle.net/11124/413Test
حقوق: Copyright of the original work is retained by the author.
رقم الانضمام: edsbas.78999017
قاعدة البيانات: BASE