SPE 108117

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SPE 108117
Refracture Treatments Proving Successful In
Horizontal Bakken Wells Richland Co, Montana

• David Greene Enerplus Resources USA
• Tom Lantz Pebble Petroleum
• Mike Eberhard, Scott Norrid, and Richard Pershall
  Halliburton Energy Services

2007 Rocky Mountain Oil Gas Technology
Symposium 17 April 2007 Denver, Colorado
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Outline

• Field Description
• Original Completion Designs
• Refracture Candidates
• Production Results
• Conclusions

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Sleeping Giant Bakken Play
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Bakken Reservoir Properties

• Net Thickness 6 15 ft
• Porosity 8 12
• Permeability 0.05 - 0.5 md
• Kv/Kh 0.1
• Water Sat. 15 25
• Oil Gravity 42 API
• GOR 500 scf/stb

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Middle Bakken Type Log
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Candidate Background

• Original 17 horizontal wells drilled
• 3,000 ft. Laterals w/ cemented liners and limited
  perforations to divert frac
• 300,000 to 600,000 lbs of 20/40 resin coated
  proppant

640 ACRE SPACING UNIT
AZIMUTH OF PRINCIPLE STRESS
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Refrac Candidate Selection

• Identify wells w/ poorer proppant coverage from
  initial frac treatment using tracer logs
• Review original completion including number of
  perfs, frac size treatment characteristics

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Refrac Candidate Selection
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Wellbore Schematic
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Original Treatment Chart
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Refracture Treatment Chart
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Comparison of the Original and Refracture
Treatment Pressures
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Refracture Treatment Tracer Log
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Refrac Results
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Production Chart
Refrac
Refrac
21,531 STB
Fig. 8Production chart showing production
increase due to refracture treatment and
decreased GOR. (Lone Tree State 36-2-H)
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Going Forward

• Evaluation of continuing Refrac program which
  includes wells with uncemented liners.
• Design of Frac treatments continues to evolve.
• Determine potential for possible candidate wells
  for third fracture treatment.

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• Thank You.
• Questions?