C&P: Optimizing Refracture Treatments in Horizontal Shale Oil and Gas Reservoirs

Speaker Robert Barba
Integrated Energy Services Inc. Bob spent 10 years with Schlumberger as an open hole field engineer, sales engineer, and product development manager. While at Schlumberger he was the North American product champion for the FracHite and Quantifrac products that integrated wireline, testing, and pumping inputs to optimize hydraulic fracture treatments.  ...


Integrated Energy Services Inc.



Bob spent 10 years with Schlumberger as an open hole field engineer, sales engineer, and product development manager. While at Schlumberger he was the North American product champion for the FracHite and Quantifrac products that integrated wireline, testing, and pumping inputs to optimize hydraulic fracture treatments.  He was also the product development manager for the QLA program that made the field log analysis “Cyberlook” program available to customers on personal computers.  Since then he has spent 19 years consulting to over 175 companies on petrophysics and completion optimization. He served as a SPE Distinguished Lecturer on integrating petrophysics with the hydraulic fracture treatment optimization process.  He has focused on the integration of petrophysics with completion designs in a variety of reservoirs in North America, conducting numerous field studies for operators evaluating the "completion efficiency" of over 1200 wells and providing "best practices" recommendations based on the study results (SPE 90483). His latest SPE paper (125008) focuses on the refracturing optimization process.  He has been responsible for the petrophysical analysis of 35 major fields worldwide as part of integrated reservoir characterization studies identifying remaining mobile hydrocarbons. He has authored 33 technical papers on the integration of petrophysics with completion designs, horizontal wells, and reservoir characterization projects.   His most recent project has been working with two major operators optimizing their completion practices in the Marcellus shale.   Bob has a BS from the US Naval Academy and MBA from the University of Florida. He is also a member of the SPE, SPWLA, AAPG, and Petroleum Society of the Canadian CIM.


Full Description
In the shale resource plays most of the activity to date has been in drilling and completing new wellbores and holding acreage by production.  In virtually all shale plays operators have increased the number of frac stages and generally obtained better production results.  This suggests that the original completions may not have adequately stimulated the length of the original wellbore and that refracture treatments in the unstimulated rock may be beneficial.  Refracs in long perforated horizontal wellbores pose several challenges in their design and execution.   Production logs typically show 80% of the production from 20% of the perforation clusters.  If the producing clusters have been drawn down below the reservoir pressure of the unstimulated rock the refrac may not initiate in the virgin rock where the majority of the reserves remain. Mechanical isolation of existing perforation clusters becomes critical, and working inside existing tubulars provides some challenges. Determining the optimum cluster and stage spacing requires an estimation of effective permeability and in-situ stress from DFIT testing which may not have been available prior to the initial completion.  A methodology is proposed to identify refracture candidates, mechanically isolate existing perforations, determine the optimum cluster and stage spacing, and successfully execute refrac treatments in a horizontal shale reservoir.
Organizer Mark Chapman

When?

Wed, May. 25, 2011
11:30 a.m. - 1 p.m. US/Central

How Much?

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Where?

Greenspoint Club
16925 Northchase Drive
Houston, Texas 77060

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