Analysis of Pressure Buildup Tests in a Naturally Fractured Reservoir

Crawford, Gary E.; Hagedorn, A.R.; Pierce, Aaron E.

doi:10.2118/4558-pa

Cited by 55 publications

(14 citation statements)

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“…In the work of Crawford et al (1976), the Warren-Root solution was combined with a nonlinear, least-squares regression technique to analyze field buildup data. A significant work on the analysis of pressure data influenced by wellbore storage and skin effects, was presented by Bourdet and Gringarten (1980).…”

Section: However Odeh (1965) Noted Two Years Later That For All Pracmentioning

confidence: 99%

Transient flow of slightly compressible fluids through double-porosity, double-permeability systems ? A state-of-the-art review

Chen

1989

Transp Porous Med

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The theory of transient flow of slightly compressible fluids through naturally fractured reservoirs based on the double porosity conceptualization is summarized. The main achievements in the theory of fluid flow in leaky aquifer systems which are closely related with the double-porosity, double-permeability problems are also addressed. The main emphasis of this review is the analytical treatment of these problems.

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Section: However Odeh (1965) Noted Two Years Later That For All Pracmentioning

confidence: 99%

Transient flow of slightly compressible fluids through double-porosity, double-permeability systems ? A state-of-the-art review

Chen

1989

Transp Porous Med

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“…2,20 This, however, can help only in multilayered reservoirs, not in fissured reservoirs. As discussed in another part of this paper, storage effects in fissured reservoirs include the effect of fissures intersecting the well and usually are one or two orders of magnitude greater than storage effects in the wellbore.…”

Section: The Double-porosity Modelmentioning

confidence: 99%

Interpretation of Tests in Fissured and Multilayered Reservoirs With Double-Porosity Behavior: Theory and Practice

Gringarten

1984

Journal of Petroleum Technology

142

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This paper summarizes current knowledge of reservoirs with double-porosity behavior. These include both naturally fissured reservoirs and multilayered reservoirs with high permeability contrast between layers. The first part presents available solutions to the direct problem (i.e., solutions to the diffusivity equation) that have appeared in the oil and groundwater literature over the past 20 years. The second part discusses methods for solving the inverse problem-i.e., identifying a double-porosity behavior and evaluating all corresponding well and reservoir parameters.Several field examples demonstrate various aspects of double-porosity behavior and illustrate how additional knowledge of the reservoir (e.g., fissured vs. multilayered, gas saturation, etc.) can be obtained from numerical values of the reservoir parameters. Practical considerations for planning tests in doubleporosity reservoirs also are included.

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“…Application to analysis of field data Crawford et al (1976) presented some field pressure buildup data (Table 2) that demonstrated the pressure response of a naturally fractured reservoir and supported the existence of the triple-porosity system. The test well was shut in after about 10 hours and pressure-buildup data were recorded with high-precision pressure gauges from a well, which produced from a two-layer reservoir.…”

Section: 5mentioning

confidence: 95%

“…The analytical model developed in this study can match the pressure response quite well (Figure 12) with the model parameters given in Table 3. Fracture porosity and matrix permeability were estimated using the 13 fracture permeability, matrix porosity, fracture-matrix storativity ratio, and fracturematrix transmissivity ratio given by Crawford et al (1976). The shape factors were evaluated using the same definition as that given by Abdassah and Ershaghi (1986).…”

Section: Application To Analysis Of Field Datamentioning

confidence: 99%

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Analysis of flow behavior in fractured lithophysal reservoirs

Liu

Bodvarsson

2003

Journal of Contaminant Hydrology

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This study develops a mathematical model for the analysis of pressure behavior in fractured lithophysal reservoirs. The lithophysal rock is described as a tri-continuum medium, consisting of fractures, rock matrices, and cavities. In the conceptual model, fractures have homogeneous properties throughout and interact with rock matrices and cavities that have different permeabilities and porosities. Global flow occurs through the fracture network only, while rock matrices and cavities contain the majority of fluid storage and provide fluid drainage to the fractures. Interporosity flows between the triple media are described using a pseudosteady-state concept and the system is characterized by interporosity transmissivity ratios and storativity ratio of each continuum. Pressure behavior is analyzed by examining the pressure drawdown curves, the derivative plots, and the effects of the characteristic parameters. Typical pressure responses from fractures, matrices, and cavities are represented by three semilog straight lines; the transitions by two troughs below the stabilization lines in the derivative plots. The analytical solution to the proposed model is further verified using a numerical simulation.The analytical model has also been applied to a published field-buildup well test and is able to match the pressure buildup data.Keywords: Naturally fractured reservoirs, Dual-porosity model, Triple-porosity model, Warren-Root solution, Well testing analysis, Dual-continuum medium. 2 IntroductionCharacterizing the behavior of naturally fractured reservoirs is important for studying the flow and transport processes in underground natural-resources recovery, waste storage, and contaminant remediation. In general, fractured rock can be considered as a multiporous medium, in which fractures and porous blocks constitute the flow system.Because of their high permeability and connectivity, fractures provide major flow channels for global fluid movement, whereas high-porosity porous blocks contain the majority of fluid storage and provide gradual fluid drainage to the fractures. Fluid flow in fractured rock is of interest in many engineering fields and has been a subject of active research for several decades. Barenblatt et al. (1960) first introduced the dual-porosity model, in which a fractured medium is represented by two completely overlapping continua, porous matrix and fractures. This double-porosity model was further developedby Warren and Root (1963) to represent the naturally fractured reservoir as an idealized system formed by identical rock-matrix blocks, separated by an orthogonally fractures.Any infinitesimal volume of the fractured formation contains a large proportion of the two constitutive media. Each point in the system is therefore assigned with two pressures, one for the fracture and the other for the matrix. Fluid exchange between the two constitutive media has been describeded by various models. A pseudosteady-state interporosity flow concept was proposed by Barenblatt et al (1960) and subsequent...

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Analysis of Pressure Buildup Tests in a Naturally Fractured Reservoir

Cited by 55 publications

References 0 publications

Transient flow of slightly compressible fluids through double-porosity, double-permeability systems ? A state-of-the-art review

Transient flow of slightly compressible fluids through double-porosity, double-permeability systems ? A state-of-the-art review

Interpretation of Tests in Fissured and Multilayered Reservoirs With Double-Porosity Behavior: Theory and Practice

Analysis of flow behavior in fractured lithophysal reservoirs

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