Summary
This paper provides a case history of the first hydraulic fracture on a
subsea horizontal well in the Quissamã formation, a low-permeability limestone
reservoir in Campos basin, Brazil.
The well was drilled in the direction of the expected fracture growth, thus
evolving longitudinal fractures along the horizontal section. It is part of a
research project to evaluate selective stimulation methods for subsea
horizontal wells. Every aspect since the drilling, completion, and evaluation
of the well was handled with the end in mind of hydraulically fracturing it in
several stages.
Hydraulically fracturing a horizontal well has become a more accepted
practice in our industry. The procedures used in fracturing vertical wells must
be taken into consideration when fracturing a horizontal well, to avoid
refracturing work. Near-wellbore (NWB) problems are usually the main reason
that fracturing work is not completed. This paper describes hydraulic-fracture
treatments with detailed discussion on analysis of calibration tests,
fluid-efficiency tests (FETs), and lessons learned.
Results of the pumping work will be presented showing theory and how common
practices played a key role for a successful application of techniques used.
Laboratory tests performed with cores taken from the well itself, such as rock
mechanics, proppant embedment, compaction measurements, and basic mineralogy,
are presented.
Production results will be presented and compared to conventional methods
used on other subsea horizontal wells in Campos basin.
© 2010. Society of Petroleum Engineers.
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History
- Original manuscript received:
7 October 2005
- Meeting paper published:
15 February 2006
- Revised manuscript received:
28 April 2008
- Manuscript approved:
6 May 2008
- Published online:
21 January 2010
- Version of record:
11 March 2010
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