A Semianalytical Model for Evaluating the Performance of a Refractured Vertical Well With an Orthogonal Refracture
- Bailu Teng (University of Alberta) | Huazhou Andy Li (University of Alberta)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- April 2019
- Document Type
- Journal Paper
- 891 - 911
- 2019.Society of Petroleum Engineers
- Semi-analytical model, Fracture conductivity, Refracturing treatment
- 14 in the last 30 days
- 166 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 12.00|
|SPE Non-Member Price:||USD 35.00|
Production from a fractured vertical well will lead to a redistribution of the stress field in formations. If the induced stress changes are sufficiently large to overcome the effect of the initial horizontal-stress deviator, the direction of the minimum horizontal stress can be turned into the direction of the maximum horizontal stress within an elliptical region around the initial fracture, resulting in a stress-reversal region near the wellbore. In such cases, a refracturing treatment can create a refracture that propagates orthogonally to the initial fracture because of the stress reversal. As such, the high-pressure area of the formation can be stimulated by the refracture, and the productivity of the refractured well can be improved. In this work, we develop a semianalytical model to evaluate the performance of a refractured vertical well with an orthogonal refracture. To simulate the well performance throughout the entire production period, we divide the well production into three stages: the first stage, when the well is producing oil with the initial fracture; the second stage, when the well is shut down for the refracturing treatment; and the third stage, when the well is producing oil with both the initial fracture and the refracture. In addition, by discretizing the initial fracture and the refracture into small segments, the conductivity of the fractures can be taken into account, and the geometry of the fracture system can be captured. We use the Green-function method to analytically simulate the reservoir flow and use the finite-difference method to numerically simulate the fracture flow; therefore, a semianalytical model can be constructed by coupling the reservoir-flow equations with the fracture-flow equations. This proposed model is applied to different wellbore and reservoir conditions. The calculated results show that this proposed model is versatile because it can simulate various wellbore constraints, including the conditions of constant bottomhole pressure (BHP), varying BHP, constant production rate, and varying production rate. The permeability anisotropy of the reservoir system, as well as the nonuniform conductivity distribution along the fracture, can also be incorporated into this proposed model. In addition, we demonstrate that this proposed model can be used to simulate other types of refractured vertical wells with minor modifications.
|File Size||1 MB||Number of Pages||21|
Aghighi, M. A., Rahman, S. S., and Rahman, M. M. 2009. Effect of Formation Stress Distribution on Hydraulic Fracture Reorientation in Tight Gas Sands. Presented at the Asia Pacific Oil and Gas Conference & Exhibition, Jakarta, 4–6 August. SPE-122723-MS. https://doi.org/10.2118/122723-MS.
Bello, R. O. and Wattenbarger, R. A. 2008. Rate Transient Analysis in Naturally Fractured Shale Gas Reservoirs. Presented at the CIPC/SPE Gas Technology Symposium 2008 Joint Conference, Calgary, 16–19 June. SPE-114591-MS. https://doi.org/10.2118/114591-MS.
Benedict, D. and Miskimins, J. L. 2009. The Effects of Hydraulic Fracture Reorientation. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, 19–21 January. SPE-119355-MS. https://doi.org/10.2118/119355-MS.
Branch, G. A. and Drennan, K. M. 1991. Refracture Stimulations in the Norge Marchand Unit: A Case Study. Presented at the SPE Production Operations Symposium, Oklahoma City, Oklahoma, 7–9 April. SPE-21642-MS. https://doi.org/10.2118/21642-MS.
Chen, Z., Liao, X., Zhao, X. et al. 2016. A Semianalytical Approach for Obtaining Type Curves of Multiple-Fractured Horizontal Wells With Secondary-Fracture Networks. SPE J. 21 (2): 538–549. SPE-178913-PA. https://doi.org/10.2118/178913-PA.
Daneshy, A. A. 1978. Hydraulic Fracture Propagation in Layered Formations. SPE J. 18 (1): 33–41. SPE-6088-PA. https://doi.org/10.2118/6088-PA.
ECLIPSE Industry-Reference Reservoir Simulator. 2015. Houston: Schlumberger.
Elbel, J. L. and Mack, M. G. 1993. Refracturing: Observations and Theories. Presented at the SPE Production Operations Symposium, Oklahoma City, Oklahoma, 21–23 March. SPE-25464-MS. https://doi.org/10.2118/25464-MS.
Ertekin, T., Abou-Kassem, J. H., and King, G. R. 2001. Basic Applied Reservoir Simulation. Richardson, Texas: Textbook Series, Society of Petroleum Engineers.
Gala, D. P. and Sharma, M. M. 2017. Effect of Fluid Type and Composition on Changes in Reservoir Stresses Due to Production: Implications for Refracturing. Presented at the 51st US Rock Mechanics/Geomechanics Symposium, San Francisco, 25–28 June. ARMA-2017-0042.
Gringarten, A. C. and Ramey, H. J. 1973. The Use of Source and Green’s Functions in Solving Unsteady-Flow Problems in Reservoirs. SPE J. 13 (5): 285–296. SPE-3818-PA. https://doi.org/10.2118/3818-PA.
Hubbert, M. K. and Willis, D. G. 1957. Mechanics of Hydraulic Fracturing. SPE-686-G.
Jiang, W., Bo, C., Yang, L. et al. 2016. Optimum Time and Critical Re-Orientation Pressure of Re-Fracturing. Presented at the SPE Asia Pacific Hydraulic Fracturing Conference, Beijing, 24–26 August. SPE-181837-MS. https://doi.org/10.2118/181837-MS.
Lantz, T. G., Greene, D., Eberhard, M. et al. 2007. Refracture Treatments Proving Successful In Horizontal Bakken Wells; Richland Co, MT. Presented at the Rocky Mountain Oil & Gas Technology Symposium, Denver, 16–18 April. SPE-108117-MS. https://doi.org/10.2118/108117-MS.
Liu, H., Lan, Z., Zhang, G. et al. 2008. Evaluation of Refracture Reorientation in Both Laboratory and Field Scales. Presented at the SPE International Symposium and Exhibition on Formation Damage Control, Lafayette, Louisiana, 13–15 February. SPE-112445-MS. https://doi.org/10.2118/112445-MS.
Luo, W. and Tang C. 2015. Pressure-Transient Analysis of Multiwing Fractures Connected to a Vertical Wellbore. SPE J. 20 (2): 360–367. SPE-171556-PA. https://doi.org/10.2118/171556-PA.
Medlin, W. L. and Masse, L. 1984. Laboratory Experiments in Fracture Propagation. SPE J. 24 (3): 256–268. SPE-10377-PA. https://doi.org/10.2118/10377-PA.
Potapenko, D. I., Tinkham, S. K., Lecerf, B. et al. 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-119636-MS. https://doi.org/10.2118/119636-MS.
Roussel, N. P. and Sharma, M. M. 2010. Quantifying Transient Effects in Altered-Stress Refracturing of Vertical Wells. SPE J. 15 (3): 770–782. SPE-119522-PA. https://doi.org/10.2118/119522-PA.
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 (4): 346–355. SPE-134491-PA. https://doi.org/10.2118/134491-PA.
Roussel, N. P. and Sharma, M. M. 2013. Selecting Candidate Wells for Refracturing Using Production Data. SPE Prod & Oper 28 (1): 36–45. SPE-146103-PA. https://doi.org/10.2118/146103-PA.
Ruhle, W. 2016. Refracturing: Empirical Results in the Bakken Formation. Presented at the Unconventional Resources Technology Conference, San Antonio, Texas, 1–3 August. URTEC-2461740-MS. https://doi.org/10.15530/URTEC-2016-2461740.
Siebrits, E., Elbel, J. L., Detournay, E. et al. 1998. Parameters Affecting Azimuth and Length of a Secondary Fracture During a Refracture Treatment. Presented at the SPE Annual Technical Conference and Exhibition, New Orleans, 27–30 September. SPE-48928-MS. https://doi.org/10.2118/48928-MS.
Siebrits, E., Elbel, J. L., Hoover, R. S. et al. 2000. Refracture Reorientation Enhances Gas Production in Barnett Shale Tight Gas Wells. Presented at the SPE Annual Technical Conference and Exhibition, Dallas, 1–4 October. SPE-63030-MS. https://doi.org/10.2118/63030-MS.
Spivey, J. P. and Lee, W. J. 1998. New Solutions for Pressure Transient Response for a Horizontal or a Hydraulically Fractured Well at an Arbitrary Orientation in an Anisotropic Reservoir. Presented at the SPE Annual Technical Conference and Exhibition, New Orleans, 27–30 September. SPE-49236-MS. https://doi.org/10.2118/49236-MS.
Warpinski, N. R. and Branagan, P. T. 1989. Altered-Stress Fracturing. J Pet Technol 41 (9): 990–997. SPE-17533-PA. https://doi.org/10.2118/17533-PA.
Weng, X. and Siebrits, E. 2007. Effect of Production-Induced Stress Field on Refracture Propagation and Pressure Response. Presented at the SPE Hydraulic Fracturing Technology Conference, College Station, Texas, 29–31 January. SPE-106043-MS. https://doi.org/10.2118/106043-MS.
Wolhart, S. L., Mclntosh, G. E., Zoll, M. B. et al. 2007. Surface Tiltmeter Mapping Shows Hydraulic Fracture Reorientation in the Codell Formation, Wattenberg Field, Colorado. Presented at the SPE Hydraulic Fracturing Technology Conference, College Station, Texas, 29–31 January. SPE-110034-MS. https://doi.org/10.2118/110034-MS.
Wright, C. A., Conant, R. A., Stewart, D. W. et al. 1994. Reorientation of Propped Refracture Treatments. Presented at Rock Mechanics in Petroleum Engineering, Delft, The Netherlands, 29–31 August. SPE-28078-MS. https://doi.org/10.2118/28078-MS.
Yang, D., Zhang, F., Styles, J. A. et al. 2015. Performance Evaluation of a Horizontal Well With Multiple Fractures by Use of a Slab-Source Function. SPE J. 20 (3): 652–662. SPE-173184-PA. https://doi.org/10.2118/173184-PA.
Yu, W. and Wu, K. 2016. A Semianalytical Model for Production Simulation From Nonplanar Hydraulic-Fracture Geometry in Tight Oil Reservoirs. SPE J. 21 (3): 1028–1040. SPE-178440-PA. https://doi.org/10.2118/178440-PA.
Zhao, B., Zhang, G., and Lin, Q. 2016. The Application of Cryogenic Treatment During Refracture Process—Laboratory Studies. Presented at the 50th US Rock Mechanics/Geomechanics Symposium, Houston, 26–29 June. ARMA-2016-552.
Zhou, W., Banerjee, R., Poe, B. D. et al. 2014. Semianalytical Production Simulation of Complex Hydraulic-Fracture-Networks. SPE J. 19 (1): 6–18. SPE-157367-PA. https://doi.org/10.2118/157367-PA.