The Effect of Restricted Fluid Entry on Well Productivity

Brons, Folkert; Marting, V.E.

doi:10.2118/1322-g

Cited by 26 publications

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“…18. SOLUTION FOR b = 0.3 and h wO = 200presented in Ref 17. were obtained by assuming uniform flux at the wellbore and then computing the wellbore pressure at a location three-quarters of the distance along the open interval.…”

mentioning

confidence: 99%

New Skin and Wellbore Storage Type Curves for Partially Penetrated Wells

Kuchuk¹,

Kirwan²

1987

SPE Formation Evaluation

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mentioning

confidence: 99%

New Skin and Wellbore Storage Type Curves for Partially Penetrated Wells

Kuchuk¹,

Kirwan²

1987

SPE Formation Evaluation

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“…In the above equations, q is the point convergence intensity, the partially penetrating well is a uniform line sink, the total productivity of the well is Q, according to Equation (13), there holds q = Q/L pD . (22) Note that in the above equations, L is the drilled well length, L p is the producing well length.…”

Section: Consequently Equation (3) Becomesmentioning

confidence: 99%

“…The problem of fluid flow into wells with partial penetration has received much attention in the past years, both in ground-water hydrology ( [ 7,8,9,10]) and in petroleum engineering ( [ 12,13,14,15,16,17,18]). …”

Section: Introductionmentioning

confidence: 99%

Well-Test-Analysis of Partially Penetrating Wells in a Circular Cylinder Drainage Volume

2003

Canadian International Petroleum Conference

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With the similar methods in Ref. [1,2,3,4,5], taking a partially penetrating well as a uniform line sink in three dimensional space, by developing necessary mathematical analysis, this paper presents partially penetrating wells pressure drawdown formulae in a circular cylinder drainage volume with constant pressure at edge boundary. We also provide the formulae to calculate pseudo-skin factor due to partial penetration. And if the producing well length is equal to the pay zone thickness, the equations of fully penetrating wells are obtained.

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“…The impact of such a development on well test interpretation and its place in the evolution of well test analysis methods are discussed in the present paper. produced by well damage or result from partial penetration (Brons and Marting 1961) or multiphase flow around the well (Kazemi 1975). Type-curve analysis (Ramey 1970;Agarwal et al 1970;McKinley 1971;Gringarten et al , 1975Cinco-Ley et al 1978;Agarwal et al 1979) was introduced by Ramey (1970) to get an insight into the meaning of the skin and therefore on the means to cure it.…”

Section: Introductionmentioning

confidence: 99%

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

Gringarten

2008

SPE Reservoir Evaluation &Amp; Engineering

114

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Well test analysis has been used for many years to assess well condition and obtain reservoir parameters. Early interpretation methods (by use of straight lines or log-log pressure plots) were limited to the estimation of well performance. With the introduction of pressure-derivative analysis in 1983 and the development of complex interpretation models that are able to account for detailed geological features, well test analysis has become a very powerful tool for reservoir characterization. A new milestone has been reached recently with the introduction of deconvolution. Deconvolution is a process that converts pressure data at variable rate into a single drawdown at constant rate, thus making more data available for interpretation than in the original data set, in which only periods at constant rate can be analyzed. Consequently, it is possible to see boundaries in deconvolved data, a considerable advantage compared with conventional analysis, in which boundaries often are not seen and must be inferred. This has a significant impact on the ability to certify reserves.This paper reviews the evolution of well test analysis techniques during the past half century and shows how improvements have come in a series of step changes 20 years apart. Each one has increased the ability to discriminate among potential interpretation models and to verify the consistency of the analysis. This has increased drastically the amount of information that one can extract from well test data and, more importantly, the confidence in that information. IntroductionResults that can be obtained from well testing are a function of the range and the quality of the pressure and rate data available and of the approach used for their analysis. Consequently, at any given time, the extent and quality of an analysis (and therefore what can be expected from well test interpretation) are limited by the stateof-the-art techniques in both data acquisition and analysis. As data improve and better interpretation methods are developed, more and more useful information can be extracted from well test data.Early well test analysis techniques were developed independently from one another and often gave widely different results for the same tests (Ramey 1992). This has had several consequences:• An analysis was never complete because there always was an alternative analysis method that had not been tried.• Interpreters had no basis on which to agree on analysis results.• The general opinion was that well testing was useless given the wide range of possible results.Significant progress was achieved in the late 1970s and early 1980s with the development of an integrated methodology on the basis of signal theory and the subsequent introduction of derivatives. It was found that, although reservoirs are all different in terms of depth, pressure, fluid composition, geology, etc., their behaviors in well tests were made of a few basic components that were always the same. Well test analysis was about finding these components, which could be achieved in a systemati...

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The Effect of Restricted Fluid Entry on Well Productivity

Cited by 26 publications

References 0 publications

New Skin and Wellbore Storage Type Curves for Partially Penetrated Wells

New Skin and Wellbore Storage Type Curves for Partially Penetrated Wells

Well-Test-Analysis of Partially Penetrating Wells in a Circular Cylinder Drainage Volume

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

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