Interference Tests in Naturally Fractured Reservoirs Under the Influence of Gas Cap or Water Influx

1993 ◽  
Author(s):  
A.S. Al-Bemani ◽  
Iraj Ershaghi
Keyword(s):  
Fractured Reservoirs ◽  
Naturally Fractured Reservoirs ◽  
Water Influx ◽  
Naturally Fractured ◽  
Interference Tests

scholarly journals A Global Search Algorithm for Determining Water Influx in Naturally Fractured Reservoirs

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2658
Author(s):  
Jiali Zhang ◽  
Xinwei Liao ◽  
Zhiming Chen ◽  
Nutao Wang
Keyword(s):  
Search Algorithm ◽  
Fractured Reservoirs ◽  
Flow Regimes ◽  
Global Search ◽  
Naturally Fractured Reservoirs ◽  
Gas Reservoir ◽  
Global Search Algorithm ◽  
Water Influx ◽  
Naturally Fractured

The determination of water influx in naturally fractured reservoirs is always a significant and difficult task in gas reservoir engineering. To improve this situation, this paper presents a new global search algorithm to determine water influx in the naturally fractured gas reservoirs. In the methodology, a dimensionless water influx derivative curve is first introduced in this paper. It is used to identify flow regimes of water invasion by combining with the water influx characteristic curve. Following that, a sensitivity analysis is performed to study the impacts of key factors on flow regimes. Finally, based on the sensitivity study and material balance equation, a global search algorithm is proposed to obtain water influx. Results show that there are two steps in the dimensionless water influx curve and a “V-shape” in the derivative curve. The smaller the aquifer and gas reservoir radius ratio is, the earlier and more obvious the “V-shape” appears. The smaller the storativity ratio is, the earlier the “V-shape” appears. The smaller the interporosity flow coefficient is, the more obvious the “V-shape” is. Results of the field application demonstrate the method applicability, which provide a good reference for further work about determination of water influx.

The Interpretation of Interference Tests in Naturally Fractured Reservoirs with Uniform Fracture Distribution

1969 ◽  
Vol 9 (04) ◽  
pp. 463-472 ◽  
Author(s):  
H. Kazemi ◽  
M.S. Seth ◽  
G.W. Thomas
Keyword(s):  
Numerical Solutions ◽  
Standard Procedure ◽  
Fractured Reservoirs ◽  
Homogeneous Model ◽  
Single Layer ◽  
Early Time ◽  
Naturally Fractured Reservoirs ◽  
Late Time ◽  
Naturally Fractured ◽  
Interference Tests

Abstract The double-porosity model of Warren and Root for examining pressure drawdown and buildup phenomena in naturally fractured reservoirs has been extended to interpret interference test results. Both analytical and numerical solutions are presented. The practicality of some of the assumptions in the Warren-Root model was also investigated. The standard procedure for interpreting interference tests in naturally fractured reservoirs heretofore employed an equivalent homogeneous reservoir model. A comparison of our results with the equivalent homogeneous model indicates the latter is inadequate for early time responses. For late time responses, however, the simpler equivalent homogeneous model yields favorable results. Finally, the effects of well spacing and the magnitude of the interporosity flow parameter are briefly cited. Introduction Interference tests can be used to provide reservoir information not obtainable from conventional pressure drawdown and buildup tests. The technique involves measuring the response in one or more wells arising from a pressure perturbation introduced into another well. It has been successfully applied to single-layer, homogeneous, unfractured, isotropic and anisotropic formations to arrive at values of well storage capacity and a measure of directional permeability.

scholarly journals Interference test interpretation in naturally fractured reservoirs

DYNA ◽  
2020 ◽  
Vol 87 (214) ◽  
pp. 121-128
Author(s):  
Freddy Humberto Escobar ◽  
Carlos Andrés Torregrosa Marlés ◽  
Guiber Olaya Marín
Keyword(s):  
Reservoir Characterization ◽  
Fractured Reservoirs ◽  
Naturally Fractured Reservoirs ◽  
Fractured Reservoir ◽  
Pressure Derivative ◽  
Naturally Fractured ◽  
Characteristic Points ◽  
Interference Test ◽  
Interference Tests ◽  
Analytical Expressions

The naturally fractured reservoir characterization is crucial because it can help to predict the flow pattern of fluids, and the storativity ratio of the fractures and to understand whether two or more wells have communication, among others. This paper presents a practical methodology for interpreting interference tests in naturally fractured reservoirs using characteristic points found on the pressure derivative curve. These kinds of tests describe a system that consists of a producing well and an observation well separated by a distance (r). Using characteristic points and features found on the pressure and pressure derivative log-log plot, Analytical expressions were developed from the characteristic points of the pressure and pressure derivative log-log plot to determine the interporosity flow parameter (λ) and the storativity ratio of the fractures (ω). Finally, examples are used to successfully verify the expressions developed so that the naturally-fractured parameters were reproduced with good accuracy.

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