Preventing Heel Dominated Fractures in Horizontal Well Refracturing
- Sophie Yi (The University of Texas at Austin, now with Pioneer Natural Resources) | Ripudaman Manchanda (The University of Texas at Austin) | Mukul Sharma (The University of Texas at Austin) | Nicolas Roussel (ConocoPhillips)
- Document ID
- Society of Petroleum Engineers
- SPE Hydraulic Fracturing Technology Conference and Exhibition, 5-7 February, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 4.1 Processing Systems and Design, 1.10 Drilling Equipment, 5.1 Reservoir Characterisation, 2 Well completion, 4 Facilities Design, Construction and Operation, 5.1.10 Reservoir Geomechanics, 2.5.2 Fracturing Materials (Fluids, Proppant), 5 Reservoir Desciption & Dynamics, 0.2 Wellbore Design, 1.6.6 Directional Drilling, 1.6 Drilling Operations, 4.1.2 Separation and Treating, 1.10 Drilling Equipment, 5.5 Reservoir Simulation, 2.5.5 Re-fracturing, 2.4 Hydraulic Fracturing
- Refrac Modeling, Heel-Dominated Fractures, Proppant Placement, Treatment Distribution, Bullheading Refrac
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Horizontal-well refracturing is important in the development of unconventional plays to improve the productivity of the refraced well and to protect parent wells from the fractures propagating from the nearby child wells. In the field, heel-biased fracture propagation is frequently observed in refracturing treatments, leaving a large fraction the wellbore understimulated. In this paper, we explain the mechanisms of heel-biased fracture propagation and suggest strategies to mitigate such behavior.
We model refracturing operations accounting for reservoir geomechanics, wellbore hydrodynamics, completion strategies, as well as near-wellbore effects. A coupled reservoir geomechanics simulator is used to calculate the poroelastic stress changes in the reservoir due to production. Then, a multi-fracture simulator with newly developed wellbore fluid and proppant transport model is applied to simulate the refracturing process. A field refrac case is simulated and the simulation results show good agreement with field diagnostics including proppant distribution among multiple fractures. The simulation results help us understand the mechanisms behind heel-biased fracture propagation in refractured wells and allow us to investigate strategies to improve refrac treatment efficiency.
The mechanisms affecting treatment distribution in refracs are investigated from two perspectives: the non-uniform pore pressure and stress profile in the reservoir, and the wellbore hydrodynamics. The latter perspective studies the fluid and proppant transport and separation in the wellbore. With the long wellbore length and the large number of open fractures, the impact of wellbore hydrodynamics on the refrac treatment distribution is very important. Wellbore friction is believed to be a minor reason for the heel-biased treatment distribution compared to proppant inertia, which could lead to the pre-mature screen out of the toe-side clusters.
Simulation results show that using small refrac stages with more frequent diverting agent application can help avoid over-stimulating the dominant fractures and promote more uniform fracture propagation. Strategies that moderate the proppant inertia could also help mitigate the heel-biased trend of refrac treatment distribution.
|File Size||1 MB||Number of Pages||20|
Cadotte, R.J., Crowley, Z. and Elbel, B. 2018a. Evaluation of Cement-Isolated Casing Liner and Degradable Particulate Diverter Refracturing Treatments in the Haynesville Shale. Presented at the SPE Hydraulic Fracturing Technology Conference and Exhibition, The Woodlands, TX, 23-25 January. SPE-189843-MS. https://doi.org/10.2118/189843-MS.
Cadotte, R.J., Elbel, B. and Modeland, N. 2018b. Unconventional Multiplay Evaluation of Casing-in-Casing Refracturing Treatments. Presented at the SPE International Hydraulic Fracturing Technology Conference and Exhibition, Muscat, Oman, 16-18 October. SPE-191451-18IHFT-MS. https://doi.org/10.2118/191451-18IHFT-MS.
Courtier, J., Gray, D., Smith, M., Stegent, N., Carmichael, J., Hassan, M. and Ciezobka, J. 2016. Legacy well protection refrac mitigates offset well completion communications in joint industry project. Presented at the SPE Liquids-Rich Basins Conference-North America, Midland, Texas, 21-22 September. SPE-181767-MS. https://doi.org/10.2118/181767-MS.
Elbel, B., Modeland, N., Habachy, S., Nabors, J. and Brannon, R. 2018. Evaluation of a Casing-in-Casing Refracturing Operation in the Burleson County Eagle Ford Formation. Presented at the IADC/SPE Drilling Conference and Exhibition, Fort Worth, Texas, 6-8 March. SPE-189644-MS. https://doi.org/10.2118/189644-MS.
Evans, S., Holley, E., Dawson, K., Garrison, N., Montes, M., Preston, G. and Hudson, S. 2016. Eagle Ford Case History: Evaluation of Diversion Techniques to Increase Stimulation Effectiveness. Presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, San Antonio, Texas, 1-3 August. URTec-2459883-MS. https://doi.org/10.15530/URTEC-2016-2459883.
Fisher, M.K., Heinze, J.R., Harris, C.D., Davidson, B.M., Wright, C.A. and Dunn, K.P. 2004. Optimizing Horizontal Completion Techniques in the Barnett Shale Using Microseismic Fracture Mapping. Presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, 26-29 September. SPE-90051-MS. https://doi.org/10.2118/90051-MS.
Fragachan, F.E., Babey, A.G., Arnold, D.M., Heminway, E.M. and Yuan, F. 2015. Secret Weapon Against the Red Queen: Using Chemical Packers and Degradable Mechanical Diverters in Refracturing Operations. Presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, 28-30 September. SPE-174789-MS. https://doi.org/10.2118/174789-MS.
Han, M., Tanakov, I., Bunker, E. and Vulgamore, T. 2018. New Mexico Delaware Basin Horizontal Well Heel Frac and Refrac Program and Hydraulic Fracture Diagnostics. Presented at the Unconventional Resources Technology Conference, Houston, Texas, 23-25 July. URTEC-2888446-MS. https://doi.org/10.15530/URTEC-2018-2888446.
Leonard, R.S., Moore, C.P., Woodroof, R.A. and Senters, C.W. 2015. Refracs-Diagnostics provide a second chance to get it right. Presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, 28-30 September. SPE-174979-MS. https://doi.org/10.2118/174979-MS.
Leonard, R.S., Woodroof, R.A., Senters, C.W., Wood, T.M. and Drylie, S.W. 2016. Evaluating and optimizing refracs-what the diagnostics are telling us. Presented at the SPE Annual Technical Conference and Exhibition, Dubai, UAE, 26-28 September. SPE-181676-MS. https://doi.org/10.2118/181676-MS.
Manchanda, R., Hwang, J., Bhardwaj, P., Sharma, M.M., Maguire, M. and Greenwald, J. 2018. Strategies for Improving the Performance of Child Wells in the Permian Basin. Presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, Houston, Texas, 23-25 July. URTEC-2900679-MS. https://doi.org/10.15530/URTEC-2018-2900679.
Molenaar, M.M. and Cox, B.E. 2013. Field cases of hydraulic fracture stimulation diagnostics using fiber optic distributed acoustic sensing (DAS) measurements and Analyses. Presented at SPE Unconventional Gas Conference and Exhibition, Muscat, Oman, 28-30 January. SPE-164030-MS. https://doi.org/10.2118/164030-MS.
Pankaj, P. and Shukla, P. 2018. Application of Refracturing Using Coiled Tubing Opens a New Door of Opportunities for Unconventional Reservoir Stimulation. Presented at the SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition. The Woodlands, Texas, 27-28 March. SPE-189933-MS. https://doi.org/10.2118/189933-MS.
Potapenko, D.I., Tinkham, S.K., Lecerf, B., Fredd, C.N., Samuelson, M.L., Gillard, M.R., Le Calvez, J.H. and Daniels, J.L, 2009. Barnett Shale refracture stimulations using a novel diversion technique. Presented at the SPE Hydraulic Fracturing Technology Conference. The Woodlands, Texas, 19-21, January. SPE-119646-MS. https://doi.org/10.2118/119636-MS.
Roussel, N.P. and Sharma, M.M., 2012. Role of stress reorientation in the success of refracture treatments in tight gas sands. SPE Prod & Oper, 27(04), pp.346-355. https://doi.org/10.2118/134491-PA.
Somanchi, K., O'Brien, C., Huckabee, P. and Ugueto, G. 2016. Insights and observations into limited entry perforation dynamics from fiber-optic diagnostics. Presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, San Antonio, Texas, 1-3 August. URTEC-2458389-MS. https://doi.org/10.15530/URTEC-2016-2458389.
Tran, T.V., Civan, F. and Robb, I.D. 2009. Correlating flowing time and condition for perforation plugging by suspended particles. SPE Drill & Compl, 24(03), pp.398-403. SPE-120847-PA. https://dx.doi.org/10.2118/120847-PA.
Ugueto, C., Gustavo, A., Huckabee, P.T., Molenaar, M.M., Wyker, B. and Somanchi, K. 2016. Perforation cluster efficiency of cemented plug and perf limited entry completions; Insights from fiber optics diagnostics. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, 9-11 February. SPE-179124-MS. https://doi.org/10.2118/179124-MS.
Wang, H., Yang, X., Zhang, W. and Sharma, M.M. 2018. Predicting Sand Production in HPHT Wells in the Tarim Basin. Presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, 24-26 September. SPE-191406-MS. https://doi.org/10.2118/191406-MS.
Whitfield, T., Watkins, M.H. and Dickinson, L.J. 2018. Pre-Loads: Successful Mitigation of Damaging Frac Hits in the Eagle Ford. Presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, 24-26 September. SPE-191712-MS. https://doi.org/10.2118/191712-MS.
Wright, C.A., Conant, R.A., Stewart, D.W. and Byerly, P.M. 1994. Reorientation of propped refracture treatments. Presented at the Rock Mechanics in Petroleum Engineering, Delft, Netherlands, 29-31 August. SPE-28078-MS. https://doi.org/10.2118/28078-MS.
Wu, C.H. and Sharma, M.M. 2016. Effect of Perforation Geometry and Orientation on Proppant Placement in Perforation Clusters in a Horizontal Well. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, 9-11 February. SPE-179117-MS. https://doi.org/10.2118/179117-MS.
Wu, C.H., Yi, S. and Sharma, M.M. 2017. Proppant distribution among multiple perforation clusters in a horizontal wellbore. Presented at the SPE Hydraulic Fracturing Technology Conference and Exhibition, The Woodlands, Texas, 24-26 January. SPE-184861-MS. https://doi.org/10.2118/184861-MS.
Yi, S. and Sharma, M. 2016. A model for refracturing operations in horizontal wells employing diverting agents. Presented at the SPE Asia Pacific Hydraulic Fracturing Conference, Beijing, China, 24-26 August. SPE-181795-MS. https://doi.org/10.2118/181795-MS.
Yi, S.S., and Sharma, M.M. 2018. A New Method to Calculate Slurry Distribution Among Multiple Fractures During Fracturing and Refracturing. J. Pet. Sci. Eng. 170: 304-314. https://doi.org/10.1016/j.petrol.2018.06.048.
Yi, S. S., Wu, C.-H., and Sharma, M. M. 2018. Proppant Distribution Among Multiple Perforation Clusters in Plug-and-Perforate Stages. SPE Prod & Oper 33(04): 654-665. SPE-184861-PA. https://doi.org/10.2118/184861-PA.