Mojdeh Delshad Research Projects

Flow Transport Modeling

Gary A. Pope, Mojdeh Delshad

The objective of this research is to develop and apply a three-dimensional, multiphase, multicomponent model capable of simulating the fate and transport of nonaqueous liquids (NAPLS) in the saturated and unsaturated zones of confined and unconfined aquifers. The model is capable of simulating multiple solids and fluid phases under realistic aquifer conditions and transformation of both organic and microbiological species. Some of the specific objectives of this research are:
 

Fractured Media - Characterization and Remediation

Public Abstract

We have developed and implemented a multiphase and multicomponent dual porosity model in a 3-D flow and transport numerical model called UTCHEM in order to evaluate the potential of current characterization and remediation technologies of nonaqueous phase liquids (NAPLs) in fractured porous media. Many natural porous media are fractured and some contain NAPL contamination. For example, the Bear Creek Burial Grounds at Oak Ridge Laboratory and the Test Area North at Idaho National Laboratory are sites with fractured media contaminated by dense NAPLs.

Modeling Wettability Alteration Using Chemical Enhanced Oil Recovery Processes in Naturally Fractured Reservoirs

Mojdeh Delshad, Kamy Sepehrnoori, Gary A. Pope

Funding amount: $445,000 for the period of Oct. 2004 - Sep. 2007

This research will provide a computer model of the complex wettability alterations that occur when detergents are used to induce oil production from fractured oil reservoirs. Extremely large volumes of oil remain in such known oil reservoirs and better models are needed to economically produce such oil by enhanced oil recovery methods.

Polymer Injectivity for a Horizontal Well with Coupled Formation-Wellbore Hydraulics

Matt Balhoff, Mojdeh Delshad, Chun Huh

Polymers are often injected into horizontal wells during EOR processes. During injection of these high-viscosity, non-Newtonian polymers, a significant pressure drop may occur along the length of the well. Accurate models for pressure drop in the well and polymer leakage into the reservoir are necessary for simulation but presently do not exist.

Surfactant Enhanced Aquifer Remediation

Abstract

The presence of dissolved-phase plumes of chlorinated solvents in many US aquifers was documented by the Council on Environmental Quality in 1981. Mackay and Cherry summarized the evidence that these plumes were derived from the dissolution and volatilization of chlorinated solvents and other dense, non-aqueous phase liquids (DNAPLs) present, but not necessarily observed, in sediment and rock beneath spill sites.

The Role of Rate-Limited Mass Transfer in Surfactant-Enhanced Aquifer Remediation

Principal Investigators: Mojdeh Delshad and Gary A. Pope

Abstract

Chlorinated solvents known as dense non-aqueous phase liquids (DNAPLs) are one of the most serious groundwater contamination problems in the U.S. Surfactant enhanced aquifer remediation has emerged in recent years as the best available technology for remediating groundwater contaminated by chlorinated solvents. Accurate flow and transport modeling with the University of Texas chemical flooding simulator, UTCHEM, has played a critical role in the understanding of surfactant remediation and its efficient and reliable use to clean up superfund sites.