From Straight Lines to Deconvolution: The Evolution of the State of the Art
in Well Test Analysis

Gringarten, Alain C.

doi:10.2523/102079-ms

Cited by 39 publications

(31 citation statements)

References 57 publications

(116 reference statements)

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“…Deconvolution has received more attention recently (von Schroeter et al 2001(von Schroeter et al , 2002Levitan 2005;Gringarten 2006) with the introduction of a stable deconvolution algorithm (von Schroeter et al 2001).…”

Section: Deconvolutionmentioning

confidence: 99%

“…It is believed that the modern deconvolution algorithm, which was introduced in the early 2000s, is much better in terms of identification than the pressure derivative technique that was introduced in the 1980s (Gringarten 2006). It is becoming easier to use deconvolution as part of the standard well test analysis, and several variations are available in modern well test analysis software.…”

Section: Deconvolutionmentioning

confidence: 99%

See 1 more Smart Citation

The Application of Well Test Deconvolution to Wireline Formation Tester Pressure Buildup and Falloff Data to Improve Coalbed Methane Reservoir Characterization

Osman

Thwaites²

2014

Day 3 Thu, February 27, 2014

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Coalbed methane (CBM) reservoirs are a growing source of relatively clean energy in many parts of the world. CBM reservoirs are fundamentally different from traditional hydrocarbon reservoirs. Gas is adsorbed on the surface of the coal cleats and not stored in pores. Still, estimation of the permeability of the coal cleats is important in judging the potential producibility of a given coal seam.Traditionally, CBM reservoirs are surface tested using injection or production techniques to access reservoir permeability (Clarkson and Bustin 2011). Recently, pressure buildup and falloff tests using the straddle packer module of a wireline formation tester have been used in CBM reservoirs to assess reservoir permeability successfully. However, low permeability, limited station time, or both have, in some cases, reduced the quality of the interpretation results.Deconvolution techniques have been available for some time; however, few practical examples are available in the literature. The use of deconvolution will generally allow extracting more of the same data. The derivative response uncertainty is normally due to errors in estimating the reservoir pressure and the flow rate. Generally, wireline formation testers provide reliable measurements of the reservoir pressure and flow rate.We applied deconvolution to pressure buildup and falloff for the first time on data acquired in a CBM environment with a straddle packer. The use of deconvolution has improved the permeability estimation from the different tests. We were also able to identify the limitations of the technique and the uncertainties in the analysis results.

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Section: Deconvolutionmentioning

confidence: 99%

Section: Deconvolutionmentioning

confidence: 99%

The Application of Well Test Deconvolution to Wireline Formation Tester Pressure Buildup and Falloff Data to Improve Coalbed Methane Reservoir Characterization

Osman

Thwaites²

2014

Day 3 Thu, February 27, 2014

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“…Well test analysis leads to the determination of parameters such as formation permeability, large-scale heterogeneities, boundaries, or well productivity (Gringarten, 2008).…”

Section: Connected Volumementioning

confidence: 99%

Using Seismic Attributes and Multiple-Point Statistics to Condition Facies Modelling of a Deepwater Turbidite Reservoir

Ronot

Ruelland

2014

All Days

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TX 75083-3836, U.S.A., fax ϩ1-972-952-9435 Seven scenarios were designed to account for geological uncertainties, and multiple stochastic realizations were generated for each scenario. Connected oil volume inferred from well testing was used as the main controlling parameter for evaluating the resulting facies models. Scenarios considering high channel stacking and large channels came best at honouring dynamic data. Other scenarios with models presenting a connected volume too low in the fairway, if considered or proven realistic, puts into question the role of levees in the dynamic behaviour of the reservoir.

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“…According to Gringarten (2006), a rate history to be used for the purpose of proper pressure-transient analysis should honor two important aspects:…”

Section: Reservoir Engineering Aspects Of Accurate Rate Measurementsmentioning

confidence: 99%

Improving Reservoir Characterization Using Accurate Flow-Rate History

Pinilla

Pardo

Warlick

et al. 2008

SPE Annual Technical Conference and Exhibition

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Well testing is one of the most effective means to characterize hydrocarbon reservoirs under dynamic conditions. Such characterization of reservoirs is as accurate as the data used for interpretation. It is, therefore, essential to have accurate measurements of both rates and pressures due to their complementary nature. Although pressure measurements are accurate, one needs to pay more attention to the rate measurements, especially during the early stages of exploration. Accurate measurements of gas and liquid flow rates using a separator are very difficult because of poor separation among the three phases when the flowing oil is heavy and viscous. This condition gets even worse in situations like low gas rates, low density contrasts among liquids, contamination of the different effluents after separation, and well instabilities leading to carry-over or carry-under.Multiphase metering based on a dual-energy Venturi technology enables simultaneous, accurate rate measurements of oil, water and gas phases produced from development, exploration or appraisal wells, while the downhole gauges measure the pressures.This paper presents comprehensive results from field tests conducted with multiphase meters in carbonate reservoirs producing Arabian heavy oil. These tests were conducted with production logging tools enabling characterization of laminated layers. Complete analyses of downhole gauge data are presented to demonstrate how the characterization of investigated formations improves with accurate rate measurements. It is also shown that if the rate measurements are not rigorous, it might lead to a misleading interpretation of the acquired pressure data.

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From Straight Lines to Deconvolution: The Evolution of the State of the Art in Well Test Analysis

Cited by 39 publications

References 57 publications

The Application of Well Test Deconvolution to Wireline Formation Tester Pressure Buildup and Falloff Data to Improve Coalbed Methane Reservoir Characterization

The Application of Well Test Deconvolution to Wireline Formation Tester Pressure Buildup and Falloff Data to Improve Coalbed Methane Reservoir Characterization

Using Seismic Attributes and Multiple-Point Statistics to Condition Facies Modelling of a Deepwater Turbidite Reservoir

Improving Reservoir Characterization Using Accurate Flow-Rate History

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