Analytical solutions for pressure perturbation and fluid leakage through aquitards and wells in multilayered aquifer systems
Reads0
Chats0
TLDR
In this article, the authors developed generalized analytical solutions that account for the combined effect of diffuse and focused leakage in a system of N aquifers with alternating leaky aquitards in response to fluid injection/extraction with any number of injection/pumping (active) wells, and passive leakage/recharge in any number, NL, of leaky wells.Abstract:
[1] Large-scale groundwater pumping or deep fluid injection in a multilayered subsurface system may generate pressure perturbation not only in the target formation(s), but also in over- and underlying units. Hydraulic communication in the vertical direction may occur via diffuse leakage through aquitards and/or via focused leakage through leaky wells. Existing analytical solutions for pressure perturbation and fluid flow in such systems consider either diffuse leakage or focused leakage, but never in combination with each other. In this study, we developed generalized analytical solutions that account for the combined effect of diffuse and focused leakage. The new solutions solve for pressure changes in a system of N aquifers with alternating leaky aquitards in response to fluid injection/extraction with any number, NI, of injection/pumping (active) wells, and passive leakage/recharge in any number, NL, of leaky wells. The equations of horizontal groundwater flow in the aquifers are coupled by the vertical flow equations in the aquitards and by the flow continuity equations in the leaky wells. The solution methodology, described in detail in this paper, involves transforming the transient flow equations into the Laplace domain; decoupling the resulting ordinary differential equations (ODEs) coupled by diffuse leakage via eigenvalue analysis; solving a system of NL × N linear algebraic equations for the unknown rates of flow through leakage wells; and superposing the solution of pressure buildup/drawdown in aquifers and aquitards resulting from flow in the NI active and NL leaky wells. Verification of the new methodology was achieved by comparison with existing analytical solutions for diffuse leakage and for focused leakage, and against a numerical solution for combined diffuse and focused leakage. Application to an eight-aquifer system with leaky aquitards and one leaky well demonstrates the usefulness and efficiency of the approach, and illustrates the pressure behavior over a spectrum of leakage scenarios and parameters.read more
Citations
More filters
Journal ArticleDOI
Making sense of global sensitivity analyses
TL;DR: Improved understanding of sensitivity analysis methods is presented through a comparison of the local sensitivity and two globalensitivity analysis methods: the Morris and Sobol'/Saltelli methods and an alternative approximation method is developed to efficiently compute the Sobol' index.
Journal ArticleDOI
Impact-driven pressure management via targeted brine extraction Conceptual studies of CO2 storage in saline formations
TL;DR: In this paper, the authors introduce the concept of impact-driven pressure management (IDPM), which involves optimization of fluid extraction to meet local (not global) performance criteria (i.e., the goal is to limit pressure increases primarily where environmental impact is a concern), and evaluate the feasibility of IDPM for a hypothetical CO 2 storage operation in an idealized multi-formation system containing a critically stressed fault zone.
Journal ArticleDOI
Diffusive leakage of brine from aquifers during CO 2 geological storage
Morteza Dejam,Hassan Hassanzadeh +1 more
TL;DR: In this article, the authors investigated the diffusive leakage of brine from a storage aquifer into overlying and underlying low permeability layers during geosequestration of carbon dioxide (CO2) through development of a theoretical model.
Journal ArticleDOI
Pressure Buildup and Brine Migration During CO2 Storage in Multilayered Aquifers
TL;DR: This study presents the application of a recently developed analytical solution for pressure buildup and leakage rates in a multilayered aquifer-aquitard system with focused and diffuse brine leakage and presents several example applications for a hypothetical CO2 injection scenario to demonstrate that the new solution is an efficient tool for analyzing regional pressure buildup.
Journal ArticleDOI
Early detection of brine and CO2 leakage through abandoned wells using pressure and surface-deformation monitoring data: Concept and demonstration
TL;DR: In this paper, the authors developed a methodology for early detection of potential CO2 leakage from geological storage formations using pressure and surface deformation anomalies. But their method is based on the assumption that leakage-induced pressure signals travel much faster than the migrating CO2; thus such anomalies may be detected early enough for risk management measures taking effect in avoiding substantial CO2 leaks.
References
More filters
Book
Dynamics of fluids in porous media
TL;DR: In this paper, the Milieux poreux Reference Record was created on 2004-09-07, modified on 2016-08-08 and the reference record was updated in 2016.
Book
Hydraulics of Groundwater
TL;DR: The reference record was created on 2004-09-07, modified on 2016-08-08 as discussed by the authors, using the reference record of the Ecoulement souterrain reference record.
Journal ArticleDOI
The relation between the lowering of the Piezometric surface and the rate and duration of discharge of a well using ground‐water storage
TL;DR: The mathematical theory of ground-water hydraulics has been based entirely on a postulate that equilibrium has been attained and therefore that water-levels are no longer falling.
Journal ArticleDOI
Remark on algorithm 368: Numerical inversion of Laplace transforms
TL;DR: A formalism which allows us to explicate certain rather gross properties of language processing systems and should be useful for designing the outlines of complex programming systems and their implementation, and it should be especially good for documentation.