How To Assess a Depth of Permeability Impairment of the Wellbore Zone Using Drillstem-Testing Flow-Period Data

Szpunar, T.; Budak, P.

doi:10.2118/157852-pa

Cited by 5 publications

(3 citation statements)

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“…where N -number of log p D vs. t i data which plot along the straight line. As shown in [12] the INiG -PIB method may be also used for the calculation of the wellbore zone permeability and the extent of the zone with improved/impaired permeability around the wellbore. It has been demonstrated in paper [11] that the INiG -PIB method yields results which are very close to the results of "slug test" method.…”

Section: Methods Of Interpretation Of "Slug Test" Data Using Inig -Pibmentioning

confidence: 99%

“…As demonstrated in [12] the short time data in Figure 3 represents the wellbore zone permeability (fracture permeability), whereas the long time data indicates permeability of coal matrix. If so, the following values may be calculated for the above provided example using the INiG -PIB method: As shown, the results of the slug test and the INiG -PIB method are in acceptable agreement.…”

Section: Methods Of Interpretation Of "Slug Test" Data Using Inig -Pibmentioning

confidence: 99%

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Methods for evaluation of “in situ” coal permeability in underground coal mines using hydrodynamic test data

Szpunar¹,

Budak²

2018

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The paper presents methods for in situ evaluation of coal permeability paying special attention to methods invented in the Oil and Gas Institute-National Research Institute (INiG-PIB). Included are: • a slug test method and alternative interpretation of slug test data using procedure devised in INiG-PIB, • a method which uses injection of water with a constant flow rate into a horizontal drainage well and accounts for the three dimensional flow (invented in INiG-PIB), • a method which uses air pressure decay in an isolated segment of a horizontal/vertical well to calculate permeability and skin effect (invented in INiG-PIB).

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Section: Methods Of Interpretation Of "Slug Test" Data Using Inig -Pibmentioning

confidence: 99%

Section: Methods Of Interpretation Of "Slug Test" Data Using Inig -Pibmentioning

confidence: 99%

Methods for evaluation of “in situ” coal permeability in underground coal mines using hydrodynamic test data

Szpunar¹,

Budak²

2018

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“…For nearly all of the analyzed case studies it has been observed that the log p D vs. t plot is linear for the initial and final period of flow and that both flow periods are separated by a transition period, for which the log p D vs. t relation does not follow the linear trend (Szpunar and Budak, 2012). This observation may be explained by the difference between the permeability of the well bore zone and permeability of the reservoir using the following reasoning:…”

Section: Technique For Interpretation Of Dst Flow Period Datamentioning

confidence: 98%

Comparison of techniques which use the DST flow period data for evaluation of reservoir parameters

Szpunar¹,

Budak²

2020

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This paper presents a comparison of techniques utilizing DST flow period data for calculation of permeability and skin. Results obtained using the commonly accepted "type curve" method and the technique presented in Szpunar (2001) are summarized. It has been demonstrated that the results of each of these methods do not differ much. Advantages and disadvantages of each technique are discussed. Our new method presented in Szpunar (2001) and developed by Szpunar and Budak (2012) may also be used for interpretation of downhole pressure or water level behavior in coal bed methane wells and water wells which do not flow to the surface after the pressure disturbance is introduced by addition or removal of water from the well. Apart from reservoir permeability and skin, the presented method enables calculation of permeability of the wellbore zone and depth of impaired/improved permeability, providing the pressure drop within the DST conduit is negligible when compared to hydrostatic pressure exerted upon reservoir by a column of liquid moving up the well. The commonly known "type curve" method does not offer such possibility. According to the authors, the "type curve" methods-in spite of their theoretical merits-provide results which are uncertain because they require adaptation of the measured curve to one of theoretical curves, the shapes of which are very similar. Summarizing-there is an acceptable agreement between permeability calculated using each of the methods discussed, but one should not expect that permeability calculated using each of the methods to be identical.

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Reservoir Formation Damage

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How To Assess a Depth of Permeability Impairment of the Wellbore Zone Using Drillstem-Testing Flow-Period Data

Cited by 5 publications

References 5 publications

Methods for evaluation of “in situ” coal permeability in underground coal mines using hydrodynamic test data

Methods for evaluation of “in situ” coal permeability in underground coal mines using hydrodynamic test data

Comparison of techniques which use the DST flow period data for evaluation of reservoir parameters

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