from total losses to full circulation: degradable fluid
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From Total Losses to Full Circulation: Degradable Fluid System for Workovers PEPANZ - 22 March 2017
Ashley Watling - Schlumberger
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© 2014 Schlumberger. All rights reserved.
An asterisk is used throughout this presentation to denote a mark of Schlumberger.
Measurable Impact is a mark of Schlumberger. Be Certain is a mark of Schlumberger.
Other company, product, and service names are the properties of their respective owners.
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What’s the Problem?
o Large number of workovers required due to solids production
o Workovers becoming increasingly difficult as reservoirs deplete
o Complete or partial losses observed in pay zones
o Production reduced, wells shut-in, wasted water and rig moves
o Solution Required to :
o Temporarily reduce loses for pump replacements
o Minimal formation damage
o Call out operation
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The Approach
Fiber based pill
Classically sized
lost circulation
material (LCM)
Medium Small Large
o Dimension of loss zone typically uncertain
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Bridge before entry into formation
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Degradation
6 days at 40 degC 1 day at 40 degC Initial
o No flush or intervention required, cleans up on production
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Field Trial 1
o 7” intermediate casing
o 2-7/8” tubing to 853m
o 4-1/2” pre-perforated liner to 1,110m (212m) 0.5” EH, 6 spf
o Highly deviated up to 62˚
o Water level ~130m from surface
o Unable to maintain circulation while replacing PCP
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Field Trial 1
o Rig equipment used (no additional equipment onsite)
o 25 bbl pill, 88% losses cured
o 22% under AFE
o Post job results inline with expectation (no pre-job results available)
o Sample from job monitored for degradation in district lab in hot bath
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Track Record
o 12 wells completed at 83% Success Rate
o 7 additional call outs
o 2 fluid formulations based on cleat size, loss rate and production history
o Completions trialed
o Vertical and Deviated
o Openhole, pre-perforated casing, tubing above and within opehole sections
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Lessons Learnt
o Rig Requirements
o Mixing Equipment
o Schlumberger Batch Mixer for superior mixing (and keeps rig tanks clean)
o Rig triplex to minimize equipment on location
o Additional wellsite QA/QC
o Remove strainers inline
o PAH/BTEX Testing completed
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Value Proposition
o Preserve production potential: Prevent fluid invasion into the reservoir
o No post job flush: Cleans-up upon production
o Pill prepared on site: Rapid response in light vehicle
o Increased rig efficiency: Less rig moves
o More Production: Less wells shut-in
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Personnel on Project
• Nikita Silko
• Sustaining
Engineer
• Novosibirsk
Technology
Center
• Irina Markova
• IP Attorney
• Novosibirsk
• Arnoud
Meyer
• Lost
Circulation
Product
Champion
• France
• Ashley
Watling
• Well Services
Technical
Sales
Support
Engineer
• Daniel Kalinin
• Geomarket Well
Services
Technical
Manager
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Way Forward
o Determine method of identifying potential candidate wells
o Continue to build case studies
o Trialing with second client this month
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Discussion
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