Michael Wilt
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View article: 3D modeling of deep borehole electromagnetic measurements with energized casing source for fracture mapping at the Utah Frontier Observatory for Research in Geothermal Energy
3D modeling of deep borehole electromagnetic measurements with energized casing source for fracture mapping at the Utah Frontier Observatory for Research in Geothermal Energy Open
We present a 3D numerical modelling analysis evaluating the deployment of a borehole electromagnetic measurement tool to detect and image a stimulated zone at the Utah Frontier Observatory for Research in Geothermal Energy geothermal site.…
View article: Borehole induction coil transmitter
Borehole induction coil transmitter Open
A borehole induction coil transmitter which is a part of a cross-borehole electromagnetic field system that is used for underground imaging applications. The transmitter consists of four major parts: 1) a wound ferrite or mu-metal core, 2)…
View article: ERT and crosswell EM imaging of CO2: Examples from a shallow injection experiment at the Carbon Management Canada CaMI FRS in Southeast Alberta, Canada
ERT and crosswell EM imaging of CO2: Examples from a shallow injection experiment at the Carbon Management Canada CaMI FRS in Southeast Alberta, Canada Open
Electromagnetic (EM) geophysical techniques offer the possibility of monitoring subsurface CO2 in saline reservoirs due to the fact that CO2 has high electrical resistivity compared to the surrounding geologic materials. In this paper we f…
View article: Enhanced Multi-Dimensional Inversion Through Target-Specific Inversion Parameter Bounds With an Application to Crosswell Electromagnetic for Sequestration Monitoring
Enhanced Multi-Dimensional Inversion Through Target-Specific Inversion Parameter Bounds With an Application to Crosswell Electromagnetic for Sequestration Monitoring Open
In geophysical inversions, lower and upper model parameter bounds are a means of solution stabilization. Further, constraints that intend to let only geologically plausible inverse solutions pass are amenable to lower and upper bounds. Rel…
View article: Observing and modeling the effects of production infrastructure in electromagnetic surveys
Observing and modeling the effects of production infrastructure in electromagnetic surveys Open
Electromagnetic (EM) methods are among the original techniques for subsurface characterization in exploration geophysics because of their particular sensitivity to the earth electrical conductivity, a physical property of rocks distinct ye…
View article: Wellbore integrity assessment with casing-based advanced sensing
Wellbore integrity assessment with casing-based advanced sensing Open
Wellbore integrity is of paramount importance to subsurface resource extraction, energy storage 1 and waste disposal. After installation, well casing and cement are subject to mechanical stress due to near-well pressure changes and fluid i…
View article: The effects of well damage and completion designs on geoelectrical responses in mature wellbore environments
The effects of well damage and completion designs on geoelectrical responses in mature wellbore environments Open
Well integrity is one of the major concerns in long-term geologic storage sites due to the potential risk of well leakage and groundwater contamination. Evaluating changes in electrical responses due to energized steel-cased wells has the …
View article: An adaptable technique for comparative image assessment: Application to crosswell electromagnetic survey design for fluid monitoring
An adaptable technique for comparative image assessment: Application to crosswell electromagnetic survey design for fluid monitoring Open
Reservoir integrity stewardship accompanying carbon capture and sequestration considers fluid extraction and reinjection as a risk-mitigating method against overpressuring that could lead to caprock damage and ensuing CO2 leakage. Crosswel…
View article: WISE-CASING: Containment and Monitoring Institute (CaMI), Calgary, Canada FEM-DC Model
WISE-CASING: Containment and Monitoring Institute (CaMI), Calgary, Canada FEM-DC Model Open
For the model calculation we applied EM3D using completion diagram of CaMI site and a background resistivity consistent with the borehole logs. It was also important to use the accurate position of the return electrode. We note that for th…
View article: WISE-CASING: Frequency Domain EM Data from Cymric Oil Field, CA
WISE-CASING: Frequency Domain EM Data from Cymric Oil Field, CA Open
Cymric oil field frequency domain electromagnetic (FEM) data with two parts of data labeled Part 1 and Part 2. Part 1 utilizes an electrical source line parallel to the receiver line, while Part 2 utilizes an electrical source line at a 75…
View article: Finite-element analysis of top-casing electric source method for imaging hydraulically active fracture zones
Finite-element analysis of top-casing electric source method for imaging hydraulically active fracture zones Open
Imaging hydraulically active fracture zones (HAFZ) is of paramount importance to subsurface resource extraction, geologic storage, and hazardous waste disposal. We have developed advanced 3D finite-element (FE) electrical imaging algorithm…
View article: Effects of completion design on electrically stimulated casing and its 3D response
Effects of completion design on electrically stimulated casing and its 3D response Open
To better understand the factors contributing to electromagentic (EM) observables in developed field sites, we examine in detail through finite element analysis the specific effects of casing completion design. The presense of steel casing…
View article: Top-casing electric-source method for imaging hydraulically active fracture zones
Top-casing electric-source method for imaging hydraulically active fracture zones Open
We examine the detection and imaging sensitivity of surface electric field measurements over a 3D hydraulically active fracture zone (HAFZ) at depth when one end point of a surface electric dipole source is directly connected to a wellhead…
View article: Casing-integrity mapping using top-casing electrodes and surface based EM fields
Casing-integrity mapping using top-casing electrodes and surface based EM fields Open
Wellbore integrity is of paramount importance to subsurface resource extraction, energy storage and hazardous waste disposal. We introduce a simple non-invasive technology for casing integrity screening, based on the continuity of electric…
View article: Fracture mapping in geothermal fields with long-offset induction logging
Fracture mapping in geothermal fields with long-offset induction logging Open
The mapping of producing fractures in a geothermal field is an important technical objective in field development. Locating, orienting, and assessing producing fractures can guide drilling programs and optimize the placement of production …
View article: Evaluation of Deep Subsurface Resistivity Imaging for Hydrofracture Monitoring
Evaluation of Deep Subsurface Resistivity Imaging for Hydrofracture Monitoring Open
This report describes the results of the first of its kind monitoring of a hydrofracture operation with electromagnetic measurements. The researchers teamed with oil and gas producer Encana Corporation to design and execute a borehole to s…