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Horizontal Well Productivity Enhancement through Drawdown Management Approach in Vaca Muerta Shale

Authors
Daniela Rojas (YPF S.A.) | Alejandro Lerza (Chevron Corp.)
DOI
https://doi.org/10.2118/189822-MS
Document ID
SPE-189822-MS
Publisher
Society of Petroleum Engineers
Source
SPE Canada Unconventional Resources Conference, 13-14 March, Calgary, Alberta, Canada
Publication Date
2018
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-582-2
Copyright
2018. Society of Petroleum Engineers
Disciplines
5.8.4 Shale Oil, 5.6.3 Pressure Transient Analysis, 1.6.6 Directional Drilling, 1.6 Drilling Operations, 5 Reservoir Desciption & Dynamics, 3 Production and Well Operations, 6.1 HSSE & Social Responsibility Management, 6.1 HSSE & Social Responsibility Management, 5.8 Unconventional and Complex Reservoirs, 3 Production and Well Operations, 2 Well completion, 0.2.2 Geomechanics, 2.4 Hydraulic Fracturing, 5.7 Reserves Evaluation, 0.2 Wellbore Design
Keywords
Argentina, Shale Oil, Vaca Muerta, Horizontal, Drawdown Management
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Abstract

Drawdown management optimization in overpressured formations is recognized as challenging by reservoir engineers. Well flowback operational procedures can vary widely and have an impact not only in the first months of production but on the long term performance as well. In this study, the results of choke management in more than a hundred horizontal wells in Loma Campana block, located in Vaca Muerta Shale Oil window, will be evaluated to investigate the potential impact on estimated ultimate recovery (EUR) and net present value (NPV).

Using different flowback strategies, production data of wells in the same interval within Vaca Muerta Fm. have been analyzed using diagnostic plots commonly applied in unconventional reservoirs to identify early flow regimes. The evolution of stress over hydraulic fractures have been evaluated as well, which may contribute to a permanent conductivity loss due to hysteresis effects. Several forecasts have been created using Rate Transient Analysis (RTA) to quantify EUR loss due to aggressive choke management and to establish a relationship between drawdown and productivity degradation.

The study found out that an aggressive choke management may cause a reduction in EUR of up to 20%. This can be attributed to a loss in fracture conductivity as a result of geomechanical-related factors. Therefore, an aggressive drawdown management is prone to minimize value, but understanding the tradeoff between the financial benefit due to production acceleration versus loss in reserves (as a result of fracture degradation) is the key issue that will be investigated in this paper. Furthermore, the proposed methodology used to integrate production performance analysis with the economic evaluation has allowed defining an optimum drawdown management for Vaca Muerta wells. Therefore, a standard procedure based on best practices is proposed for managing new wells put on production.

As summary, this work provides evidence of production dependence on drawdown based on empirical data of horizontal wells in Loma Campana Oilfield. Complementing the study with RTA analysis has allowed quantifying the loss in EUR, estimating the effect of fracture degradation and verifying the economic impact. Finally, a workflow is proposed to accomplish optimum pressure decline with the right choke selection over time to optimize well performance.

File Size  1 MBNumber of Pages   13

Roberto Suarez-Rivera, Chaitanya Deenadayalu, Maxim Chertov, Ricardo Novalo Hartanto, Patrick Gathogo, Schulumberger, and Rahul Kunjir, University of Utah, "Improving Horizontal Completions on Heterogeneous Tight Shales", paper CSUG/SPE 146998 presented at the Canadian Unconventional Resources Conference, Calgary, Alberta, Canada, 15-17 November 2011.

D.M. Anderson; M. Nobakht; S. Moghadam; and L. Mattar, Fekete Associates Inc. "Analysis of Production Data from Fractures Shale Gas Wells", paper SPE 131787 presented at the Unconventional Gas Conference, Pittsburgh, Pennsylvania, USA, 23-25 February 2010.

Monti, Luciano J.; Suarez, Mariano I.; Thompon, Antony R.; SPE, YPF S.A.; and Vega, Leonardo, SPE, W.D. Von Gonten&Co, "Modeling Vertical Multifractures Wells in Vaca Muerta Shale Oil Play, Argentina", paper SPE 164537 presented at the Unconventional Resources Conference-USA, The Woodlands, Texas, USA, 10-12 April 2013.

Hoss Belyadi, Consol Energy; Ebrahim Fathi and Fatemeh Belyadi, WVU, "Manage Pressure Drawdown in Utica/Point Pleasant with Case Studies", paper SPE 184054 presented at the SPE Eastern Regional Meeting, Ohio, USA, 13-15 September 2016

Toby Deen; Johan Daal and James Tucker, Devon Energy, "Maximizing Well Deliverability in the Eagle Ford Shale Through Flowback Operations", paper SPE 174831 presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, USA, 28-30 September 2015.

Orkhan Samandarli, SPE; Beth McDonald, SPE; Gervazio Barzola, AAPG; Mark Murray, SPE; and Perry Richmond, SPE, Pioneer Natural Resources, "Understanding Shale Performance: Performance Analysis Workflow with Analytical Models in Eagle Ford Shale Play", paper SPE 169004 presented at the SPE Unconventional Resources Conference, The Woodlands, Texas, USA, 1-3 April 2014.

Matias Fernandez Badessich and Vicente Berrios, YPF, "Integrated Dynamic Flow Analysis to Caracterized an Unconventional Reservoir in Argentina: The Loma La Lata Case", paper SPE 156163 presented in SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 8-10 October 2012.

Rimedio, M., Shannon, C., Monti, L., Lerza, A., Roberts, M., & Quiroga, J. "Interference Behavior Analysis in Vaca Muerta Shale Oil Development, Loma Campana Field, Argentina." paper SPE 2154850 presented at the Unconventional Resources Technology Conference, San Antonio 20-22 July 2015.

P. Liang, J.M. Thompson, L. Mattar, Fekete Associates Inc. "Importance of the Transition Period to Compound Linear Flow in Unconventional Reservoirs", paper SPE 162646 presented at the SPE Canadian Unconventional Resources Conference, Calgary, Alberta, Canada, 30 October-1 November 2012.

K. Wilson, Chevron Energy Technology Company, "Analysis of Drawdown Sensitivity in Shale Reservoirs Using Couple-Geomechanical Models", paper SPE-175029 presented at the SPE Annual Technical Conference and Exhibition, Houton, Texas, USA, 28-30 September 2015.

J.M. Terracina, J. M. Turner, D.H. Collins and S.E. Spillars, Hexion "Proppant Selection and its Effect on the Results of Fracturing Treatments Performed in Shale Formations", paper SPE 135502 presented at the SPE Annual Technical Conference and Exhibition, Florence, Italy, 19-22 September 2010.

R.A. Wattenbarger, A. H. El-Banbi, M. E. Villegas and J.B. Maggard "Production Analysis of Linear Flow Into Fractured Tight Gas Wells", paper SPE 39931 presented at the SPE Rocky Mountain Regional/Low Permeability Reservoirs Symposium and Exhibition, Denver, Colorado, 5-8 April 1998.

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