Consideration of Damaged Zone in a Tight Gas Reservoir Model With a Hydraulically Fractured Well
- Aron Behr (Freiberg U. of Mining and Technology) | George Mtchedlishvili (Freiberg U. of Mining and Technology) | Torsten Friedel (Freiberg U. of Mining and Technology) | Frieder K.A. Haefner (Freiberg U. of Mining and Technology)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2006
- Document Type
- Journal Paper
- 206 - 211
- 2006. Society of Petroleum Engineers
- 5.4.2 Gas Injection Methods, 5.5 Reservoir Simulation, 5.5.8 History Matching, 1.8 Formation Damage, 5.1.5 Geologic Modeling, 5.3.1 Flow in Porous Media, 5.6.4 Drillstem/Well Testing, 4.6 Natural Gas, 5.3.2 Multiphase Flow, 4.1.2 Separation and Treating, 5.2 Reservoir Fluid Dynamics, 2.5.2 Fracturing Materials (Fluids, Proppant), 5.8.1 Tight Gas, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation
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This paper provides a detailed description of conditions in the hydraulically damaged fracture environment after closure and how to integrate them into a reservoir-simulation model.
A special model-initialization algorithm was developed and realized in a support tool to make possible the computing of a post-fracture performance in tight gas formations by a reservoir simulator. The input represents the treatment schedule of the fracturing process and some results produced by commercial fracturing packages or geophysical measurements.
To represent the fracture geometry and properties, the information about the distribution of the proppant concentration in the fracture as well as the fracture-width variation is translated into the permeabilities and porosities of the fracture gridblocks. To determine the fracturing-fluid saturation in the invaded zone, a new approach was derived to imitate the fracture propagation at a fracturing period under consideration of the leakoff processes. The penetration of the fracturing fluid into the matrix was modeled by the Buckley-Leverett equations for two-phase nonmiscible displacement, with boundary conditions provided by a classical leakoff theory.
The approach is illustrated with a simulation model prepared for the analysis of the cleanup process in a damaged fractured well within a Rotliegende tight gas formation in north Germany.
The fluid that leaked off into the tight gas formation during the fracturing treatment may significantly suppress gas production because of the two-phase flow effects and the capillary end effect between the reservoir and fracture (Holditch 1979). Therefore, for more plausible evaluation of hydraulic fracture stimulation, an accurate representation of the flow in the immediate fracture environment becomes a necessity. In terms of numerical simulation of post-fracture well performance, the problem can be addressed by (1) an adequate representation of the fracture in a reservoir simulator and (2) a reasonably accurate picture of the initial fluid distribution around the fracture.
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