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Title: Laboratory measurements of flow through wellbore cement-casing microannuli.

Abstract

Abstract not provided.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1261051
Report Number(s):
SAND2015-5082C
594695
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 49th Us Rock Mechanics/Geomechanics Symposium held June 28 - July 1, 2015 in San Francisco, CA.
Country of Publication:
United States
Language:
English

Citation Formats

Matteo, Edward N, Stormont, John C., Ahmad, Rashid, Ellison, Joshua, and Taha, Mahmoud Reda. Laboratory measurements of flow through wellbore cement-casing microannuli.. United States: N. p., 2015. Web.
Matteo, Edward N, Stormont, John C., Ahmad, Rashid, Ellison, Joshua, & Taha, Mahmoud Reda. Laboratory measurements of flow through wellbore cement-casing microannuli.. United States.
Matteo, Edward N, Stormont, John C., Ahmad, Rashid, Ellison, Joshua, and Taha, Mahmoud Reda. Mon . "Laboratory measurements of flow through wellbore cement-casing microannuli.". United States. doi:. https://www.osti.gov/servlets/purl/1261051.
@article{osti_1261051,
title = {Laboratory measurements of flow through wellbore cement-casing microannuli.},
author = {Matteo, Edward N and Stormont, John C. and Ahmad, Rashid and Ellison, Joshua and Taha, Mahmoud Reda},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 2015},
month = {Mon Jun 01 00:00:00 EDT 2015}
}

Conference:
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  • Abstract not provided.
  • Until recently, the visco-inertial flow equation, which is an adaptation of Forchheimer's quadratic equation, has been used to describe gas flow behavior at higher flow rates and pressures. The inability of this equation, in some cases, to fully describe high-velocity, high-pressure gas flow behavior, especially around the well bore, led to the consideration of other empirical equations. In this paper, formal derivation of Forchheimer's cubic equation is made by considering the kinetic energy equation of mean flow and dimensional relations for one-dimensional, linear, incompressible fluid flow. By the addition of the cubic term, this equation is regarded as a modifiedmore » Forchheimer's quadratic equation which accounts for the flow rates obtained beyond the laminar flow condition. The cubic equation spans a wide range of flow rates and regimes, i.e. Darcy type, inertial type, and turbulent. For suitable use in gas flow studies, this equation has been adapted, modified, and corrected for the gas slippage effect. The physical basis of the cubic term has been established by using boundary layer theory to explain the high-velocity, high-pressure flow behavior through a porous path. Gamma, the main parameter in the cubic term, is directly related to a characteristic, dimensionless shape factor which is significant at higher flow rates. It is inversely related to viscosity, but has no dependence on the gas slippage coefficient in the higher flow regime.« less
  • This paper describes recently observed problems of cement sheath deposition on the inside circumference of a casing string. Actual job parameters and several proposed causes of the cement sheath are reviewed. The probable hypothesis for the cement sheath deposition is a combination of temperature, cement retardation, large cement volumes, and the surfactant contained in the slurry. This hypothesis was explored through the use of large-scale, physical models to duplicate the actual well problem in the laboratory. Based on test results, the principal cause of cement sheath development is surfactant in the cement slurry. Once the surfactant is removed or retardingmore » agent is added to the slurry, the cement slurry can be successfully placed. This paper also includes a laboratory procedure that provides for timely screening of potential cement slurries to determine sheathing tendencies.« less
  • We present a set of reactive transport experiments in cement fractures. The experiments simulate coupling between flow and reaction when acidic, CO{sub 2}-rich fluids flow along a leaky wellbore. An analog dilute acid with a pH between 2.0 and 3.15 was injected at constant rate between 0.3 and 9.4 cm/s into a fractured cement core. Pressure differential across the core and effluent pH were measured to track flow path evolution, which was analyzed with electron microscopy after injection. In many experiments reaction was restricted within relatively narrow, tortuous channels along the fracture surface. The observations are consistent with coupling betweenmore » flow and dissolution/precipitation. Injected acid reacts along the fracture surface to leach calcium from cement phases. Ahead of the reaction front, high pH pore fluid mixes with calcium-rich water and induces mineral precipitation. Increases in the pressure differential for most experiments indicate that precipitation can be sufficient to restrict flow. Experimental data from this study combined with published field evidence for mineral precipitation along cemented annuli suggests that leakage of CO{sub 2}-rich fluids along a wellbore may seal the leakage pathway if the initial aperture is small and residence time allows mobilization and precipitation of minerals along the fracture.« less