Monitoring a Water Flood of Moderate Saturation Changes with Crosswell Electromagnetics (EM): A Case Study from Dom Joao Brazil

Wilt, Michael; Zhang, Ping; Maeki, Jorge; Netto, Paulo; Queiroz, J.; Santos, J.; Oliveira, Valterlene de

doi:10.1190/segam2012-1226.1

Cited by 5 publications

(3 citation statements)

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“…This process employs an iterative procedure to update and minimize the differences between the measured data and the modelled responses in a least-squares sense (Abubakar et al, 2005;Li, Abubakar, Li, Pan, & Habashy, 2010;Wilt & Alumbaugh, 2014). The resulting resistivity distributions are used to track inter-well fluid movements (Mieles et al, 2009;Wilt et al, 2012).…”

Section: Principles Of Em Induction Cross-well Tomographymentioning

confidence: 99%

Applications of tomography in the oil-gas industry – Part 2

Xie¹,

Wilt

2015

Industrial Tomography

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Section: Principles Of Em Induction Cross-well Tomographymentioning

confidence: 99%

Applications of tomography in the oil-gas industry – Part 2

Xie¹,

Wilt

2015

Industrial Tomography

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“…Wilt et al . ). The study indicated that cross‐well EM is less likely than ERT to provide reliable time‐lapse images under the expected SAGD conditions.…”

Section: Introductionmentioning

confidence: 97%

“…The feasibility study also included a cross-well electromagnetic system for reservoir-scale resistivity imaging (e.g. Wilt et al 2012). The study indicated that cross-well EM is less likely than ERT to provide reliable time-lapse images under the expected SAGD conditions.…”

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confidence: 99%

Reservoir monitoring of steam‐assisted gravity drainage using borehole measurements

Tøndel

Schütt

Dümmong

et al. 2014

Geophysical Prospecting

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This paper presents the results from a research project focusing on permanent cross‐well geophysical methods for reservoir monitoring during steam‐assisted gravity drainage. A feasibility study indicated detectable differences in seismic and electrical reservoir properties based on expected changes in temperature and fluid saturation during the production of extra heavy oil. As a result of this, a permanent cross‐well system was installed at the Leismer Demonstration Area, located in the Athabasca Oil Sands region in Alberta, Canada. Baseline data sets, including cross‐well seismic, three‐dimensional vertical seismic profiling and cross‐well electrical resistivity tomography, have been acquired. Comparisons between conventional surface seismic and downhole seismic data show an increase in resolution and frequency content as expected. Steam‐assisted gravity drainage‐induced time‐lapse effects are clearly visible in the 3D vertical seismic profiling and electrical resistivity tomography data sets, even after a few months of oil production. In general, the 3D vertical seismic profiling images show a higher resolution than the surface seismic data, in particular when dealing with vertical positioning of the time‐lapse events. The electrical resistivity tomography baseline shows clear separation between zones of high and low electrical resistivity, and during 23 months of electrical resistivity tomography measurements the maximum reduction of resistivity is 85%. Time‐lapse observations from acoustic and electrical borehole data correspond well, and are also supported by temperature measurements in the two observation wells. Emerging technologies, updated models, improved flexibility, and reduced costs will allow future reservoir monitoring with surface and borehole data in combination, or even with borehole data exclusively.

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DAS/DTS/DSS/DPS/DxS - Do We Measure What Adds Value?

et al. 2016

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Inwell measurement of rates and ratios do not allow operators to proactively control flow into the well. For intelligent fields there is a growing need for tools that enable engineers to ‘see’ further into the reservoir in order to adjust and/or change the flow control strategy as required. From a reservoir management perspective the most value can be achieved when implementing intelligent flow control systems coupled with surveillance tools. Hence, this study presents a way of defining a fit for purpose surveillance strategy that can be coupled with active flow control systems that facilitates the optimisation of the recovery efficiency. A dynamic simulator was used to analyse and determine a monitoring strategy that provides the most cost effective method of understanding various phenomena occurring within the reservoir, such as water/gas encroachment. The intention of the study was to determine if the data set currently obtained is sufficient enough to provide a deep understanding of the reservoir. The dynamic simulator modelled the temperature, saturation and pressure changes and the post-processer was used to derive corresponding changes in resistivity and acoustic properties. The change in temperature was important to model in order to study the parameter for its surveillance value as well as to capture thermal effects on reservoir fluid properties and geomechanical properties. The electro-magnetic and acoustic properties were calculated using a well-known formulae; resistivity was derived by inverting the Archie equation. Results from the study were used to specify what the surveillance tools should measure and what detection distance would allow operators to proactively adjust the flow control devices/valves in order to maximise the value of the development. Sensitivity and optimisation analysis was conducted to obtain the distance of investigation required by the surveillance. The study demonstrated that a simple 1-way coupling gives representative estimations of electro-magnetic and acoustic properties over field production time. This will be able to assist in determining which methods of surveillance can be used over the life of the field assisting in recommending a suitable data acquisition strategy to extract maximum value from the tools available; DAS/DTS/DSS/DPS/DxS, EM, seismic and other methods. Simple 1-way coupling is often enough to estimate the change with suitable accuracy to assess feasibility of various surveillance techniques. DAS could have an application in continuous cross-well tomography to follow the flood front; this subject is to be studied further.

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Monitoring a Water Flood of Moderate Saturation Changes with Crosswell Electromagnetics (EM): A Case Study from Dom Joao Brazil

Cited by 5 publications

References 0 publications

Applications of tomography in the oil-gas industry – Part 2

Applications of tomography in the oil-gas industry – Part 2

Reservoir monitoring of steam‐assisted gravity drainage using borehole measurements

DAS/DTS/DSS/DPS/DxS - Do We Measure What Adds Value?

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