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DOWNHOLE SHUT-IN
TOOL
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MAIN FEATURES
Nan
Gall’s downhole shut-in tool, in conjunction with
Nan Gall memory gauges, can produce benefits in the following
circumstances:
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Wellbore
storage effects during pressure build-up surveys can
“mask” the reservoir flow period, thus making
interpretation very difficult.
-
Leaking
flow-line valves on many older wells can mean that true
surface shut-in is never achieved.
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Oil-gas
wells, when shut-in at surface, can have a large gas
cap forming which gives erroneously high bottom-hole
pressures.
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The
length of time wells must be shut-in at surface to achieve
useful bottom-hole pressure information is excessive.
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Pressure
fall-off data following water injection is always distorted
by the hydrostatic column above the gauges.
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SPECIFICATIONS
OPEN
POSITION
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- Electro-mechanical
downhole shut-in tool using 2 x AA Lithium cells.
- Length –
2 ½ feet
- Weight –
20 lbs.
- Maximum Working
Temperature – 150ºC.
- Maximum Working
Pressure – 10,000 psi.
- Maximum Differential
Pressure – 5,000 psi.
- Minimum Working
Pressure – 200 psi.
- Suitable for
all completions 1.875” or larger.
- No restriction
in flow area – dictated by the lock ID.
- Standard Slickline
connection (15/16” sucker rod)
- Programmable
delay time of up to 7 days (in 10 minute intervals). Simple
operation – no computer required.
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CLOSED
POSITION
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 Back
to list of specification sheets
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