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

Abstract

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.

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

“…Type curves for the analysis of drawdown and buildup data, as well as pressure transient data from observation wells using the transient interporosity flow model and their applications to field data, can be found in Bourdet and Gringarten (1980), Gringarten (1984) -x. CHEN (1984), and Reynolds et al (1985).…”

Analysis of flow behavior in fractured lithophysal reservoirs

“…We This limits the transient effect to be of only short duration (Gringarten, 1984). The improvement can be made by simplify the geometry of storage matrix blocks, depending on the geology of the reservoirs.…”

Analysis of hydraulic tests of the Culebra and Magenta Dolomites and Dewey Lake Redbeds conducted at the Waste Isolation Pilot Plant Site

“…The boundary was modeled as a discrete feature 1,140 ft (350 m) from H-6b, but more likely represents the increase in Culebra transmissivity known to occur to the west in Nash Draw and/or to the east towards wells DOE-2 and WIPP-13 (Beauheim, 1986(Beauheim, , 1987b. The estimated skin factor is strongly negative (-5.9, indicating a stimulated well in direct connection with fractures (Gringarten, 1984). Other interpreted parameters are listed in Table 6-1.…”