Restimulation of Unconventional Reservoirs: When Are Refracs Beneficial?
- Michael Vincent (Insight Consulting)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- May 2011
- Document Type
- Journal Paper
- 36 - 52
- 2011. Society of Petroleum Engineers
- 4.3.3 Aspaltenes, 1.8 Formation Damage, 2.5.2 Fracturing Materials (Fluids, Proppant), 4.1.2 Separation and Treating, 4.3.4 Scale
- Bakken, restimulation, refrac, increased recovery, propped fracture
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- 2,724 since 2007
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Restimulation treatments have been attempted in a wide variety of reservoirs, and more than 140 papers have been published documenting the success and failure of these efforts. A database of these published examples has been compiled and analyzed to identify the mechanisms responsible for production improvement following restimulation with propped fractures (refracs). A portion of this database was recently published (Vincent 2010), and specific field examples were highlighted to demonstrate that refrac treatments can improve production by numerous mechanisms, including
- Enlarged fracture geometry
- Improved pay coverage through increased fracture height in vertical wells
- Greater lateral coverage in horizontal wells or initiation of more transverse fractures
- Increased fracture conductivity compared with initial frac
- Restoration of fracture-conductivity loss caused by embedment, cyclic stress, proppant degradation, gel damage, scale, asphaltene precipitation, fines plugging, and other factors
- Increased conductivity in previously unpropped or inadequately propped portions of fracture
- Use of more-suitable fracturing fluids
- Reorientation caused by stress-field alterations, leading to contact of "new" rock
This paper will briefly review restimulation attempts in six Canadian reservoirs of interest to the local audience, and will then present a more-detailed review of restimulation of horizontal wells in the unconventional Bakken oil formation. In addition to a summary of published results, this paper will introduce a significant amount of previously unpublished data regarding refrac treatments of horizontal laterals completed in the Middle Bakken. This study will identify several additional concerns and opportunities with restimulating horizontal wellbores that were not previously identified in literature reviews. This organized summary of field results and references will provide significant value to readers evaluating or designing restimulation treatments.
|File Size||2 MB||Number of Pages||61|
Besler, M.R. 2008. Re-fracturing: Is Too Little Prevention Requiring theCure? Presented at the 2008 Williston Basin Petroleum Conference, Minot, NorthDakota, USA, April 27-29.
Besler, M.R., Steele, J.W., Egan, T., and Wagner, J. 2007. Improving WellProductivity and Profitability in the Bakken--A Summary of Our ExperiencesDrilling, Stimulating, and Operating Horizontal Wells. Paper SPE 110679presented at the SPE Annual Technical Conference and Exhibition, Anaheim,California, USA, 11-14 November. doi: 10.2118/110679-MS.
Cobb, S.L. and Farrell, J.J. 1986. Evaluation of Long-Term ProppantStability. Paper SPE 14133 presented at the SPE International Meeting onPetroleum Engineering, Beijing, 17-20 March. doi: 10.2118/14133-MS.
Core Laboratories. 2002-2005. Stim-Lab Proppant Conductivity Consortium, http://www.corelab.com/pe/stimlab/Consortia/ProppantConductivity.aspx.
Coulter, G.R. and Menzie, D.E. 1973. The Design of Refrac Treatments forRestimulation of Subsurface Formations. Paper SPE 4400 presented at theSPE/AIME Rocky Mountain Regional Meeting, Casper, Wyoming, USA, May 15-16. doi: 10.2118/4400-MS.
Dunek, K.L., Walser, D.W., and Astakhov, D.K. 2009. Far-Field VolumetricDistribution of Fracturing Fluids Away From an Uncemented Horizontal Liner inthe Bakken Formation. Paper SPE 115826 presented at the SPE Rocky MountainTechnology Conference, Denver, 14-16 April. doi: 10.2118/115826-MS.
Eberhard, M. 2008. Review of Current Bakken Practices, MT and ND. Presentedat the 2008 Williston Basin Petroleum Conference, Minot, North Dakota, USA,April 27-29.
Fox, J.N. and Martiniuk, C.D. 1994. Reservoir Characteristics and PetroleumPotential of the Bakken Formation, Southwest Manitoba. J Can Pet Technol 33 (8): 19-27. JCPT Paper No. 94-08-02. doi: 10.2118/94-08-02.
Gutor, C., Al-Saleem, A., Rieger, B., and Lemp, S. 2003. New Life for OldWells--A Case Study of the Effects of Re-Stimulating Gas Wells Using FracturingThrough Coiled Tubing and Snubbing Techniques. Paper SPE 81730 presented at theSPE/ICoTA Coiled Tubng Conference and Exhibition, Houston, 8-9 April. doi: 10.2118/81730-MS.
Hahn, G. 1986. How Long Will It Prop? Drilling, The WellsitePublication 47 (6): 596. Dallas: Energy Publications.
Handren, P. and Palisch, T. 2007. Successful Hybrid Slickwater FractureDesign Evolution--An East Texas Cotton Valley Taylor Case History. Paper SPE110451 presented at the SPE Annual Technical Conference and Exhibition,Anaheim, California, USA, 11-14 November. doi: 10.2118/110451-MS.
Howard, G.C. and Fast, C.R. 1970. Hydraulic Fracturing. MonographSeries, SPE, Richardson, Texas 2.
Kasper, D., Hendry, H.E., and Renaut, R.W. 1995. Stratigraphy andDepositional Environments of the Bakken Formation (Upper Devonian/LowerMississippian) in West-central Saskatchewan. J Can Pet Technol 34 (4): 25-32. JCPT Paper No. 95-04-02. doi: 10.2118/95-04-02.
Ko, S.C.M., Domier, D.B., and MacDermott, R.N. 1995. Waterflood Optimizationof the Buffalo Coulee Bakken Heavy Oil Pool of Southwestern Saskatchewan. PaperSPE 30285 presented at the SPE International Heavy Oil Symposium, Calgary,19-21 June. doi:10.2118/30285-MS.
Krasey, R. and Jackson, M. 1992. Revitalization of the Pembina. J Can PetTechnol 31 (9): 65-72. JCPT Paper No. 92-09-08. doi: 10.2118/92-09-08.
Kreis, L.K., Costa, A., and Osadetz, K.G. 2005. New Perspectives on theHydrocarbon Potential of Bakken and Torquay Formations, SoutheasternSaskatchewan. Proc., 2005 Core Conference: Global Roundup—Exploring EnergySystems, Calgary, 23-24 June, 134-177. http://www.cspg.org/conventions/abstracts/2005Core/kreis_l_hydrocarbon_potential_bakken_torquay.pdf.
Lantz, T., Greene, D., Eberhard, M., Norrid, S., and Pershall, R. 2007.Refracture Treatments Proving Successful in Horizontal Bakken Wells: RichlandCounty, Montana. Paper SPE 108117 presented at the Rocky Mountain Oil and GasTechnology Symposium, Denver, 16-18 April. doi: 10.2118/108117-MS.
Leshchyshyn, T., Poleschuk, A., Hernke, K., and Lamb, M. 1999. Technical andEconomic Rationalization of Oil Refracture Programs on Wells PreviouslyStimulated With Water-Based Fracture Fluids. Paper 99-60 presented at theCSPG/Petroleum Society Joint Convention, Calgary, 14-18 June. doi: 10.2118/99-60.
Majcher, M.B., Estrada, C.A., and Archer, J.C. 2005. Evaluation of thePotential for Reduction in Well Spacing of the Bakken Sand Pool, Court Field.Paper SPE 97741 presented at the SPE/PS-CIM/CHOA International ThermalOperations and Heavy Oil Symposium, 1-3 November. doi: 10.2118/99741-MS.
McDaniel, B.W. 1986. Conductivity Testing of Proppants at High Temperatureand Stress. Paper SPE 15067 presented at the 1986 SPE California RegionalMeeting, Oakland, California, 2-4 April. doi: 10.2118/15067-MS.
McMillan, D.J. and Suffron, R.D. 1995. Innovative Re-fracturing ProgramProduces Economic and Technical Success in Foothills Cardium Formation. PaperCIM 95-44 presented at the 46th Annual Technical Meeting, Calgary, 7-9 June. doi: 10.2118/95-44.
Meza, B., Tremblay, B., and Doan, Q. 2002. Visualization of Sand StructuresSurrounding a Horizontal Well Slot During Cold Production. Paper SPE 79025presented at the SSPE International Thermal Operations and Heavy Oil Symposiumand International Horizontal Well Technology Conference, Calgary, 4-7 November.doi: 10.2118/79025-MS.
Meza-Diaz, B, Tremblay, B., and Doan, Q. 2003. Mechanisms of Sand ProductionThrough Horizontal Well Slots in Primary Production. J Can Pet Technol 42 (10): 36-46. JCPT Paper No. 03-10-04. doi: 10.2118/03-10-04.
Montgomery, C.T. and Steanson, R.E. 1985. Proppant Selection--The Key toSuccessful Fracture Stimulation. J Pet Technol 37 (12):2163-2172. SPE-12616-PA. doi:10.2118/12616-PA.
Phillips, Z.D., Halverson, R.J., Strauss, S.R., Layman, J.M. II, and Green,T.W. 2007. A Case Study in the Bakken Formation: Changes to Hydraulic FractureStimulation Treatments Result in Improved Oil Production and Reduced TreatmentCosts. Paper SPE 108045 presented at the Rocky Mountain Oil & GasTechnology Symposium, Denver, 16-18 April. doi: 10.2118/108405-MS.
Pollastro, R.M., Cook, T.A., Roberts, L.N.R., Schenk, C.J., Lewan, M.D.,Anna, L.O., Gaswirth, S.B., Lillis, P.G., Klett, T.R., and Charpentier, R.R.2008. Assessment of Undiscovered Oil Resource in the Devonian-MississippianBakken Formation, Williston Basin Province, Montana and North Dakota, 2008.National Assessment of Oil and Gas Fact Sheet 2008-3021, U.S. Geological Survey(April 2008), http://pubs.usgs.gov/fs/2008/3021/pdf/FS08-3021_508.pdf.
Rankin, R., Thibodeau, M., Vincent, M.C., and Palisch, T.T. 2010. ImprovedProduction and Profitability Achieved With Superior Completions in HorizontalWells: A Bakken/Three Forks Case History. Paper SPE 134595 presented at the SPEAnnual Technical Conference, Florence, Italy, 19-22 September. doi: 10.2118/134595-MS.
Reeves, S.R. 1996. Assessment of Technological Barriers and PotentialBenefits of Restimulation R&D for Natural Gas Wells. Final Report, GRI96/0267, Gas Research Institute, Chicago, Illinois (July 1996).
Sallee, W.L. and Rugg, F.E. 1953. Artificial Formation Fracturing inSouthern Oklahoma and North Central Texas. AAPG Bulletin 37(11) : 2539-2550. doi:10.1306/5CEADDFD-16BB-11D7-8645000102C1865D.
Shah, S.N., Vincent, M.C., Rodriquez, R., and Palisch, T. 2010. FractureOrientation and Proppant Selection for Optimizing Production in HorizontalWells. Paper SPE 128612 presented at the SPE Oil and Gas India Conference andExhibition, Mumbai, India, 20-22 January. doi: 10.2118/128612-MS.
Vincent, M.C. 2009. Examining Our Assumptions--Have OversimplificationsJeopardized Our Ability to Design Optimal Fracture Treatments? Paper SPE 119143presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands,Texas, USA, 19-21 January. doi:10.2118/119143-MS.
Vincent, M.C. 2010. Refracs--Why Do They Work, and Why Do They Fail in 100Published Field Studies? Paper SPE 134330 presented at the SPE Annual TechnicalConference and Exhibition, Florence, Italy, 19-22 September. doi: 10.2118/134330-MS.
Vincent, M.C., Miller, H.B., Milton-Tayler, D., and Kaufman, P.B. 2004.Erosion by Proppant: A Comparison of the Erosivity of Sand and CeramicProppants during Slurry Injection and Flowback of Proppant. Paper SPE 90604presented at the SPE Annual Technical Conference and Exhibition, Houston, 26-29September. doi:10.2118/90604-MS.
Williams, P. 2008. Characteristics: Defined and Described. In BakkenShale: The Play Book. Houston, Texas: Hart Energy.