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
- 0 in the last 30 days
- 749 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 12.00|
|SPE Non-Member Price:||USD 35.00|
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.
|File Size||536 KB||Number of Pages||6|
Banerjee, R., Gunasekera, D., and Fletcher, C.K.J. 2004. Simulation ofHydraulically Fractured Horizontal and Vertical Wells to Well Testing AccuracyUsing Unstructured Grids.Proc. of the 7th European Conference on theMathematics of Oil Recovery, Baverno, Italy:M-21.
Barenblatt, G.I., Entov, V.M., and Ryzhik, V.M. 1990. Theory of Fluid FlowsThrough Natural Rocks. Dordrecht/Boston/London: Kluwer Academic Publishers.395.
Bastian, P.A. and Sherman, J.B. 1993. Analysis of a HydraulicallyFractured, Low-Permeability Gas Reservoir Using Numerical Simulation. SPEAdvanced Technology Series 1 (2): 172-181. SPE 21511.
Ehrl, E. and Schueler, S.K. 2000. Simulation of a Tight Gas Reservoirwith Horizontal Multifractured Wells. Paper SPE 65108 presented at the SPEEuropean Petroleum Conference, Paris, 24-25 October.
Friedel, T., Mtchedlishvili, G., Behr, A., Voigt, H.-D., and Häfner, F.2004. Numerical Analysis of Cleanup Processes in German Tight-Gas Formationswith Fractured Wells. Oil & Gas European Magazine30 (9): 133-136.
Friedel, T., Nekrassov, A., Behr, A., Mtchedlishvili, G., and Haefner, F.2002. Representation of Fractured Well to Numerical Modeling Post-FracturingProduction from Tight Reservoirs. Proc., 8th European Conference on theMathematics of Oil Recovery, Freiberg, Germany, 3-6 September.
Holditch, S.A. 1979. FactorsAffecting Water Blocking and Gas Flow From Hydraulically Fractured GasWells. JPT 31 (12): 1,515-1,524.SPE 7561.
Howard, G.C. and Fast, C.R. 1970. Hydraulic Fracturing. SPE Monograph Series, Vol. 2. Dallas: SPE.
Nghiem, L.X., Forsyth, P.A. Jr., and Behie, A. 1984. A Fully Implicit Hydraulic FractureModel. JPT 36 (7): 1,191-1,198. SPE 10506.
Robinson, B.M., Holditch, S.A., Whitehead, W.S., and Peterson, R.E. 1992. Hydraulic Fracturing Research in EastTexas: Third GRI Staged Field Experiment . JPT 44 (1): 78-87. SPE22878.
Settari, A. 1980. Simulation ofHydraulic Fracturing Processes. SPEJ 20 (6): 487-500. SPE 7693.
Settari, A., Puchyr, P.J., and Bachman, R.C. 1990. Partially Decoupled Modeling ofHydraulic Fracturing Process. SPEPE 5 (1): 37-44. SPE 16031.
Settari, A., Sullivan R.B., and Bachman R.C. 2002. The Modeling of the Effect of WaterBlockage and Geomechanics in Waterfracs. Paper SPE 77600 presented at theSPE Annual Technical Conference and Exhibition, San Antonio, Texas, 29September-2 October.
Sherman, J.B. and Holditch, S.A. 1991. Effect of Injected Fracture Fluidsand Operating Procedures on Ultimate Gas Recovery. Paper SPE 21496presented at the SPE Gas Technology Symposium, Houston, 22-24 January.
Soliman, M.Y. and Hunt, J.L. 1985. Effect of Fracturing Fluid and ItsCleanup on Well Performance. Paper SPE 14514 presented at the SPE EasternRegional Meeting, Morgantown, West Virginia, 6-8 November.
Tannich, J.D. 1975. LiquidRemoval From Hydraulically Fractured Gas Wells. JPT 27 (11):1,309-1,317.SPE 5113.