wireline formation testing without the wireline...2018/01/09 · horizontal / deviated wells...
TRANSCRIPT
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Wireline Formation Testing Without the Wireline
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Power supplied by downhole battery
Logic and data recording in downhole memory sub
Commands and replies by two-way pressure pulse communications
Conveyance by –
Garaged inside drillpipe “Shuttle (CWS)”
Drop Off
Toolpush for 3⅞ - 4⅛” (98 - 105mm)
© 2004 Weatherford. All rights reserved.
Memory Formation Testing
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Horizontal / deviated wells
Problem hole conditions
Provides a solution if wireline unit is unavailable
Smaller hole sizes
Identify oil water gas contacts
Identify compartmentalized reservoirs
Depleted reservoirs
© 2004 Weatherford. All rights reserved.
Memory Formation Testing Applications
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Access to pressure data previously inaccessible
Reliable operation
Low sticking risk – tool is self centering when set, and generates positive pressure at pad at the end of each test
Triple draw down
Tool attached to drill pipe (already fished!)
Small rig footprint
Operated with a crew of two
© 2004 Weatherford. All rights reserved.
Memory Formation Testing Advantages
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Drill pipe depth not wireline depth
Parameters fixed at start of job
Dataset is ‘near time’ not realtime
Realtime LQC is limited to delta-P
© 2004 Weatherford. All rights reserved.
Memory Formation Testing Challenges
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Single, dual or triple pretest option
Programmed Tests are fully adjustable in terms of time, drawdown rate and volume
Drawdown pressure – 6,000 psi
40cc pretest size available
Up to 1.2cc/sec rate
Sidewall force – Variable to 3,300 lb
Suggest small slow test first followed by faster second / third test
© 2004 Weatherford. All rights reserved.
Memory Formation Testing Drawdown Options
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Memory Formation Tester Deployment
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Signalling from Surface
Signals are sent from surface using the mud pumps
Command options are:
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Memory Formation Testing Sequence
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Pretest Routine
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Real Time LQC – Defining Delta P
© 2004 Weatherford. All rights reserved.
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Why Delta P and not Final Shut in Pressure?
No Seal
Tight Test
Good Test
© 2004 Weatherford. All rights reserved.
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Realtime LQC – Animation
24.72 37.08 43.26 46.35
Two pulses sent down to request a test Tool replies, command received Test carried out, tool replies test complete
12-bit sequence
User selects discriminator
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Summary
The Memory Formation Tester has unique well access advantages
Demonstrated significant rig time savings and improved safety compared to wireline pipe conveyed logging
The Memory Formation Tester has demonstrated a low differential pressure sticking risk
Memory Formation Testing has produced significant data value to clients
© 2004 Weatherford. All rights reserved.
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Questions?