Selecting Candidate Wells for Refracturing Using Production Data
- Nicolas P. Roussel (ConocoPhillips) | Mukul M. Sharma (University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- February 2013
- Document Type
- Journal Paper
- 36 - 45
- 2013. Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 5.8.1 Tight Gas
- 3 in the last 30 days
- 1,912 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 12.00|
|SPE Non-Member Price:||USD 35.00|
The selection of candidate wells for refracturing is often very difficult to peform based on the information available at the surface. We propose a systematic methodology to allow a field engineer to evaluate a well's potential for refracturing from an analysis of field-production data and other reservoir data commonly available. The well-selection method was successfully confronted to a case study in the Wattenberg field using data from 300 Codell tight gas wells.
The performance of refracturing treatments has been observed to be highly variable in the Wattenberg field (Colorado), with some wells underperforming while others are restored to initial or even higher production rates. Historically, multiple approaches have been taken to select the best candidate wells, including heuristic guidelines, field correlations, and neural networks.
After identifying the physical phenomena that are thought to impact the performance of refracturing operations, five dimensionless groups were developed to quantify them. By choosing a dimensionless approach, the goal is to establish refracturing criteria that will not limited to one specific field, but may used in distinct oil and gas fields. One potential motivation for refracturing is the stress reorientation occurring around a fractured well, causing the refracture to propagate orthogonally to the initial fracture in underdepleted sections of the reservoir. Numerical simulations of the areal extent of the stress-reversal region as well as tiltmeter measurements confirmed the existence of refracture reorientation in the Codell formation. Guidelines for the selection of refracturing candidates were expressed in terms of the potential for stress reorientation, the quality of the initial completion, the initial production decline, and the reservoir depletion around the well of interest. Two groups of wells showed the most promise for refracturing: (a) ineffective initial completions with a small initial production decline and (b) long initial fractures in underdepleted reservoirs. The dimensionless groups help us identify such wells and provide quantitative criteria for selection of wells that may be good candidates for refracturing.
|File Size||1 MB||Number of Pages||10|
Berchenko, I. and Detournay, E. 1997. Deviation of hydraulic fracturesthrough poroelastic stress changes induced by fluid injection and pumping.Int. J. Rock Mech. Min. Sci. 34 (6): 1009-1019. http://dx.doi.org/10.1016/S1365-1609(97)80010-X.
Crowell, R.F. and Jennings, A.R. 1978. A Diagnostic Technique forRestimulation Candidate Selection. Presented at the SPE Annual TechnicalConference and Exhibition, Houston, 1-3 October. SPE-7556-MS. http://dx.doi.org/10.2118/7556-MS.
Elbel, J.L. and Mack, M.G. 1993. Refracturing: Observations and Theories.Presented at the SPE Production Operations Symposium, Oklahoma City, Oklahoma,USA, 21-23 March. SPE-25464-MS. http://dx.doi.org/10.2118/25464-MS.
Guppy, K.H., Cinco-Ley, H., and Ramey, H.J. Jr. 1981. Effect of Non-DarcyFlow on the Constant-Pressure Production of Fractured Wells. SPE J. 21 (3): 390-400. SPE-9344-PA. http://dx.doi.org/10.2118/9344-PA.
Liu, H., Lan, Z., Zhang, G. et al. 2008. Evaluation ofRefracure Reorientation in Both Laboratory and Field Scales. Presented at theSPE International Symposium and Exhibition on Formation Damage Control,Lafayette, Louisiana, USA, 13-15 February. SPE-112445-MS. http://dx.doi.org/10.2118/112445-MS.
Minner, W.A., Wright, C.A., Stanley, G.R. et al. 2002.Waterflood and Production-Induced Stress Changes Dramatically Affect HydraulicFracture Behavior in Lost Hills Infill Wells. Presented at the SPE AnnualTechnical Conference and Exhibition, San Antonio, Texas, USA, 29 September-2October. SPE-77536-MS. http://dx.doi.org/10.2118/77536-MS.
Mohaghegh, S., Reeves, S., and Hill, D. 2000. Development of an IntelligentSystems Approach for Restimulation Candidate Selection. Presented at theSPE/CERI Gas Technology Symposium, Calgary, Alberta, 3-5 April. SPE-59767-MS.http://dx.doi.org/10.2118/59767-MS.
Moore, L.P. and Ramakrishnan, H. 2006. Restimulation: CandidateSelection Methodologies and Treatment Optimization. Presented at the SPE AnnualTechnical Conference and Exhibition, San Antonio, Texas, USA, 24-27 September.SPE-102681-MS. http://dx.doi.org/10.2118/102681-MS.
Oberwinkler, C. and Economides, M.J. 2003. The DefinitiveIdentification of Candidate Wells for Refracturing. Presented at the SPE AnnualTechnical Conference and Exhibition, Denver, 5-8 October. SPE-84211-MS. http://dx.doi.org/10.2118/84211-MS.
Oberwinkler, C., Ruthammer, G., Zangl, G. et al. 2004. NewTools for Fracture Design Optimization. Presented at the SPE InternationalSymposium and Exhibition on Formation Damage Control, Lafayette, Louisiana,USA, 18-20 February. SPE-86467-MS. http://dx.doi.org/10.2118/86467-MS.
Reeves, S.R. 2001. Natural Gas Production Enhancement viaRestimulation. Final Report GRI-01/0144 (June 2001).
Reeves, S.R., Bastian, P.A., Spivey, J.P. et al. 2000.Benchmarking of Restimulation Candidate Selection Techniques in Layered, TightGas Sand Formations Using Reservoir Simulation. Presented at the SPE AnnualTechnical Conference and Exhibition, Dallas, 1-4 October. SPE-63096-MS. http://dx.doi.org/10.2118/63096-MS.
Reeves, S.R., Hill, D.G., Tiner, R.L. et al. 1999.Restimulation of Tight Gas Sand Wells in the Rocky Mountain Region. Presentedat the SPE Rocky Mountain Regional Meeting, Gillette, Wyoming, USA, 15-18 May.SPE-55627-MS. http://dx.doi.org/10.2118/55627-MS.
Roussel, N.P. and Sharma, M.M. 2010. Quantifying Transient Effects inAltered-Stress Refracturing of Vertical Wells. SPE J. 15(3): 770-782. SPE-119522-PA. http://dx.doi.org/10.2118/119522-PA.
Roussel, N.P. and Sharma, M.M. 2010. Role of StressReorientation in the Success of Refracture Treatments in Tight Gas Sands.Presented at the SPE Annual Technical Conference and Exhibition, Florence,Italy, 19-22 September. SPE-134491-MS. http://dx.doi.org/10.2118/134491-MS.
Roussel, N.P. and Sharma, M.M. 2011. Optimizing FractureSpacing and Sequencing in Horizontal-Well Fracturing. SPE Prod &Oper 26 (2): 173-184. SPE-127986-PA. http://dx.doi.org/10.2118/127986-PA.
Siebrits, E., Elbel, J.L., Detournay, E. et al. 1998.Parameters Affecting Azimuth and Length of a Secondary Fracture During aRefracture Treatment. Presented at the SPE Annual Technical Conference andExhibition, New Orleans, 27-30 September. SPE-48928-MS. http://dx.doi.org/10.2118/48928-MS.
Singh, V., Roussel, N.P., and Sharma, M.M. 2008. StressReorientation Around Horizontal Wells. Presented at the SPE Annual TechnicalConference and Exhibition, Denver, 21-24 September. SPE-116092-MS. http://dx.doi.org/10.2118/116092-MS.
Sneddon, I.N. 1946. The Distribution of Stress in the Neighbourhood of aCrack in an Elastic Solid. Proc. of the Royal Society of London. Series A.Mathematical and Physical Sciences 187 (1009): 229-260. http://dx.doi.org/10.1098/rspa.1946.0077.
Vincent, M.C. 2010. Refracs: Why Do They Work, And Why Do They Fail In 100Published Field Studies? Presented at the SPE Annual Technical Conference andExhibition, Florence, Italy, 19-22 September. SPE-134330-MS. http://dx.doi.org/10.2118/134330-MS.
Walsh, M.P. and Lake, L.W. 2003. A Generalized Approach toPrimary Hydrocarbon Recovery, 361-367. Amsterdam: Elsevier Science B.V.
Warpinski, N.R. and Branagan, P.T. 1989. Altered-Stress Fracturing. J.Pet Tech 41 (9): 990-997. SPE-17533-PA. http://dx.doi.org/10.2118/17533-PA.
Weng, X. and Siebrits, E. 2007. Effect of Production InducedStress Field on Refracture Propagation and Pressure Response. Presented at theSPE Hydraulic Fracturing Technology Conference, College Station, Texas, USA,29-31 January. SPE-106043-MS. http://dx.doi.org/10.2118/106043-MS.
Wolhart, S.L., McIntosh, G.E., Zoll, M.B. et al. 2007. Surface TiltmeterMapping Shows Hydraulic Fracture Reorientation in the Codell Formation,Wattenberg Field, Colorado. Presented at the SPE Annual Technical Conferenceand Exhibition, Anaheim, California, USA, 11-14 November. SPE-110034-MS. http://dx.doi.org/10.2118/110034-MS.
Wright, C.A. and Conant, R.A. 1995. Hydraulic FractureReorientation in Primary and Secondary Recovery from Low-PermeabilityReservoirs. Presented at the SPE Annual Technical Conference and Exhibition,Dallas, 22-25 October. SPE-30484-MS. http://dx.doi.org/10.2118/30484-MS.