Integrating DAS, Treatment Pressure Analysis and Video-Based Perforation Imaging to Evaluate Limited Entry Treatment Effectiveness
- David Cramer (ConocoPhillips) | Kyle Friehauf (ConocoPhillips) | Glyn Roberts (EV) | Jeff Whittaker (EV)
- 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 Facilities Design, Construction and Operation, 4.1.2 Separation and Treating, 2 Well completion, 3 Production and Well Operations, 2.2 Installation and Completion Operations, 2.5.2 Fracturing Materials (Fluids, Proppant), 2.2.2 Perforating, 1.10 Drilling Equipment, 2.4 Hydraulic Fracturing, 1.6.6 Directional Drilling, 2.1.3 Completion Equipment, 1.6 Drilling Operations, 1.10 Drilling Equipment, 4.1 Processing Systems and Design
- perforation imaging, pressure analysis, hydraulic fracturing, diagnostics, case study
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The primary objectives of perforating a lengthy cased-and-cemented wellbore section for fracture stimulation are to 1.) enable extensive communication with the reservoir and 2.) control the allocation of fluid and proppant into multiple intervals as efficiently as possible during fracturing treatments. Simultaneously treating multiple intervals reduces the number of fracturing stages required, thus reducing treatment cost. One way to control the allocation is to use limited entry perforating. Limited entry is the process of either limiting the number of perforations or reducing the size of the perforation entry-hole to achieve significant perforation friction pressure during a hydraulic fracturing treatment. Perforation friction establishes a backpressure in the wellbore that helps to allocate flow among multiple, simultaneously-treated perforation intervals/clusters that have differing fracture propagation pressures. Execution and optimization of limited entry perforating requires awareness of the factors that can affect performance. This paper presents a case study of plug-and-perf horizontal well treatments in an unconventional shale play in which various diagnostic methods were used to better understand and quantify these factors.
Within the case study, three types of perforation evaluation diagnostics were implemented: 1.) injection step-down tests and pressure analysis of the fracturing treatments, 2.) video-based perforation imaging and 3.) distributed acoustic sensing (DAS).
Injection step-down tests indicated that all perforations were initially accepting fluid. However, history-matched solutions of step-down tests are non-unique due to multiple variables involved in the calculations and uncertainty regarding the exact initial-perforation conditions. Surface pressure analysis of the main fracturing treatments indicated that in certain cases, several perforations were not accepting fluid and proppant (slurry) by the end of the job. The number of inactive perforations was typically equivalent to the amount contained in two clusters.
Video-based imaging highlighted several trends and concepts for perforating. Zero-phase perforating toward the high side of the well was advantageous for obtaining quality images and relatively consistent perforation dimensions. A large majority of perforations showed unambiguous qualitative evidence of significant proppant entry. Even though images captured were post-stimulation, it was apparent that initial perforation dimensions were significantly smaller and gun phasing had a more significant effect than originally predicted. Evaluation of the erosion patterns on the perforations showed a positional bias where for a given frac stage, perforations in clusters nearest the heel of the well were more eroded than perforations in clusters nearest the toe of the well.
Distributed acoustic sensing (DAS) analysis confirmed the conclusions of the surface pressure analysis. In the example provided, the data showed all clusters accepting fluid during the step-down test. Later in the stage, the DAS data showed two clusters not accepting fluid at different times of the stage. DAS analysis was able to confirm the timing and position of the two clusters. The DAS data also showed a positional bias, allocating more slurry volume to clusters nearest the heel of the well. However, DAS analysis also showed that changing the number of perforations in a cluster had a larger effect than the positional bias. The staggered perforation design featuring two fewer perforations in the cluster closest to the heel effectively counteracted the positional bias but resulted in diverting too much slurry volume from that cluster.
The results also highlight the importance of perforator quality control in terms of perforation hole size. Treating pressure and DAS analysis indicated a particular cluster stopped taking slurry relatively early in the treatment and post-frac imaging dimensioned the hole sizes and revealed they were extremely undersized from the expected hole size.
Based on the results of the case study, it was recommended to use a staggered perforation design with more gradual changes. This was verified with modeling using updated parameters which showed that the resulting changes are likely to improve slurry allocation.
|File Size||6 MB||Number of Pages||43|
Behrmann, L.A., and Elbel, J.L. 1991. Effect of Perforations on Fracture Initiation. J Pet Technol, 43 (05) 608-615. SPE 20661-PA. http://dx.doi.org/10.2118/20661-PA
Behrmann, L.A., Nolte, K.G. 1999. Perforating Requirements for Fracture Stimulations. SPE Drilling & Completion 14 (04). 228 - 234. SPE-59480-PA. http://dx.doi.org/10.2118/59480-PA
Crespo, F., Kunnath Aven, N., Cortez, J., Soliman, M., Bokane, A., Jain, S., Deshpande, Y. 2013. Proppant Distribution in Multistage Hydraulic Fractured Wells: A Large-Scale Inside-Casing Investigation. SPE 163856-MS, prepared for presentation at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, 4-6 February. http://dx.doi.org/10.2118/163856-MS
Cramer, D.D. 1987. The Application of Limited-Entry Techniques in Massive Hydraulic Fracturing Treatments. SPE 16189-MS presented at the SPE Production Operations Symposium, Oklahoma City, 8-10 March. http://dx.doi.org/10.2118/16189-MS
Cramer, D.D., Dawson, J., Ouabdesselam, M. 1991. An Improved Gelled Oil System for High-Temperature Fracturing Applications. SPE 21859-MS presented at the Rocky Mountain Regional Meeting and Low-Permeability Reservoirs Symposium, Denver, April 15-17. http://dx.doi.org/10.2118/21859-MS
Cramer, D. D. 1996. Rewards & Pitfalls of Using Treating Pressure Analysis for Evaluating Fracture Design. SPE 36772-MS presented at the SPE Annual Technical Conference and Exhibition, Denver, 6-9 October. http://dx.doi.org/10.2118/36772-MS
Crump, J.B., Conway, M.W. 1988. Effects of Perforation-Entry Friction on Bottomhole Treating Analysis. J Pet Technol 40 (08). 1,041 - 1,048. SPE-15474-PA. http://dx.doi.org/10.2118/15474-PA
Daneshy, A.A. 2011. Hydraulic Fracturing of Horizontal Wells: Issues and Insights. SPE 140134-MS presented at the SPE Hydraulic Fracturing Technology Conference and Exhibition, The Woodlands, 24-26 January. http://dx.doi.org/10.2118/140134-MS
El-Rabaa, A.M., Shah, S.N., Lord, D.L. 1997. New Perforation Pressure Loss Correlations for Limited Entry Fracturing Treatments. SPE 38373-MS presented at the SPE Rocky Mountain Regional Meeting, Casper, WY, Society of Petroleum Engineers. http://dx.doi.org/10.2118/38373-MS
Haustveit, K., Dahlgren, K., Greenwood, H., Peryam, T., Kennedy, B., Dawson, M. 2017. New Age Fracture Mapping Diagnostic Tools-A STACK Case Study. SPE 184862-MS. http://dx.doi.org/10.2118/184862-MS
Holley, E. H., & Kalia, N. 2015. Fiber-optic Monitoring: Stimulation Results from Unconventional Reservoirs. Unconventional Resources Technology Conference. doi:10.15530/URTEC-2015-2151906
Lowe, T., Potts, M., & Wood, D. 2013. A Case History of Comprehensive Hydraulic Fracturing Monitoring in the Cana Woodford. SPE 166295-MS. http://dx.doi.org/10.2118/166295-MS
Long, G., Xu, G. 2017. The Effects of Perforation Erosion on Practical Hydraulic-Fracturing Applications. SPE Journal. 22(02). 645-659. SPE-185173-PA. http://dx.doi.org/10.2118/185173-PA
Lord, D.L., McGowen, J.M. 1986. Real-Time Treating Pressure Analysis Aided by New Correlation. SPE 15367-MS, presented at the 61st SPE Annual Technical Conference, New Orleans, 5-8 Oct. http://dx.doi.org/10.2118/15367-MS
Lord, D. L., Shah, S.N., Rein, R.G.Jr., Lawson III, J.T. 1994. Study of Perforation Friction Pressure Employing a Large-Scale Fracturing Flow Simulator. SPE 28508-MS presented at the 1994 SPE Annual Technical Conference and Exhibition, New Orleans, Sept. 25-28. http://dx.doi.org/10.2118/28508-MS
Martinez, R., Hill, A.D., Zhu, D. 2014. Diagnosis of Fracture Flow Conditions with Acoustic Sensing. SPE 168601-MS. http://dx.doi.org/10.2118/168601-MS
Molenaar, M.M., Cox, B.E. 2013. Field Cases of Hydraulic Fracture Stimulation Diagnostics Using Fiber Optic Distributed Acoustic Sensing (DAS) Measurements and Analyses. SPE 164030-MS. http://dx.doi.org/10.2118/164030-MS
Nagel, N. B., M. Sanchez-Nagel. 2011. "Stress Shadowing and Microseismic Events: A Numerical Evaluation", Paper SPE 147363-MS presented at the SPE Annual Technical Conference and Exhibition, Denver, 30 October-2 November. http://dx.doi.org/10.2118/147363-MS
PetroWiki. 2018. https://petrowiki.org/Elastic_wellbore_stress_concentration
Roberts, G., Lilly, T.B., Tymons, T.R. 2018. Improved Well Stimulation Through the Application of Downhole Video Analytics. SPE 191466-18IHFT-MS presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Jan. 23. http://dx.doi.org/10.2118/189851-MS
Roberts, G., Whittaker, J.L., McDonald, J. 2018. A Novel Hydraulic Fracture Evaluation Method Using Downhole Video Images to Analyze Perforation Erosion. SPE 191466-18IHFT-MS presented at the SPE International Hydraulic Fracturing Technology Conference, Muscat, Oct. 16. http://dx.doi.org/10.2118/191466-18IHFT-MS
Rytlewski, G. R., Cook, J. M. 2006. A Study of Fracture Initiation Pressures in Cemented Cased-Hole Wells Without Perforations. SPE-100572-MS presented at The SPE Gas Technology Symposium, Calgary, Alberta, Canada. 15-17 May. SPE-100572-MS. http://dx.doi.org/10.2118/100572-MS
Schlumberger Oilfield Glossary. 2018. https://www.glossary.oilfield.slb.com
Shah, S.N., Lord, D.L. 1990. Hydraulic Fracturing Slurry Transport in Horizontal Pipes. SPE Drill Eng. Sept., 225-232. SPE 18994-PA. http://dx.doi.org/10.2118/18994-PA
Shen, Y., Holley, E., Jaaskelainen, M. 2017. Quantitative Real-Time DAS Analysis for Plug-and-Perf Completion Operation. Unconventional Resources Technology Conference. http://dx.doi.org/10.15530/URTEC-2017-2668525
Somanchi, K., Brewer, J., Reynolds, A. 2017. Extreme Limited Entry Design Improves Distribution Efficiency in Plug-n-Perf Completions: Insights from Fiber-Optic Diagnostics. SPE 184834-MS. http://dx.doi.org/10.2118/184834-MS.
Stokely, C. L. 2016. Acoustics-Based Flow Monitoring During Hydraulic Fracturing. SPE 179151-MS Engineers. http://dx.doi.org/10.2118/179151-MS
Ugueto, G. A., Huckabee, P. T., & Molenaar, M. M. 2015. Challenging Assumptions About Fracture Stimulation Placement Effectiveness Using Fiber Optic Distributed Sensing Diagnostics: Diversion, Stage Isolation and Overflushing. SPE 173348-MS. http://dx.doi.org/10.2118/173348-MS
Ugueto C., G. A., Huckabee, P. T., Molenaar, M. M., Wyker, B., Somanchi, K. 2016. Perforation Cluster Efficiency of Cemented Plug and Perf Limited Entry Completions; Insights from Fiber Optics Diagnostics. SPE 179124-MS. http://dx.doi.org/10.2118/179124-MS
Weddle, P., Griffin, L., Pearson, M. 2018. Mining the Bakken II - Pushing the Envelope with Extreme Limited Entry Perforating. SPE 189880-MS presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, TX, USA, 23-25 January. http://dx.doi.org/10.2118/189880-MS
Weijers, L., de Pater, H., Owens, K., . 1994. Geometry of Hydraulic Fractures Induced From Horizontal Wells. SPE Prod & Fac. 9 (02). 87-92. SPE-25049-PA. http://dx.doi.org/10.2118/25049-PA
Wheaton, B., Haustveit, K., Deeg, W., Miskimins, J., Barree, R. 2016. A Case Study of Completion Effectiveness in the Eagle Ford Shale Using DAS/DTS Observations and Hydraulic Fracture Modeling. SPE 179149-MS. http://dx.doi.org/10.2118/179149-MS
Xu, G., Wong, S.-W. 2013. Interaction of Multiple Non-Planar Hydraulic Fractures in Horizontal Wells. IPTC-17043-MS presented at the International Petroleum Technology Conference, Beijing, 26-28 March. http://dx.doi.org/10.2523/IPTC-17043-MS