surface well testing presentation_new (1)
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Click to edit Master subtitle style4/23/12
Presented by: Mirza AhsanInternETS
SURFACE WELL TESTING(SWT)
Tubing ConveyedPerforation (TCP)Drill Stem Testing (DST)
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DST Introductoin
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The primary DST functions, whetherconducted in openhole or casedwells, are to:
Isolate the target zone.
Control well flow.
Convey fluid to surface.
Acquire downhole data.
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Surface Well Testing
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WELL TESTING is the only techniqueexamining a significant portion of thereservoir under dynamic conditions to
determine its production capabilities andreservoir properties.
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SWT General layout
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Flow Head
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It supports the weight of the teststring.
It allows up-and-down androtation movement of the teststring.
It flows out of the well through aflow valve.
It allows to pump fluid into thewell through a kill valve.
It allows tools to be introduced
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Flow head-Configuration
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The 4 gates valves:
Swab valve: to run tools in downhole.
Master valve: to isolate the surfaceequipment from the downhole string. Itis the first valve at surface to control thewell.
Kill valve: to inject fluid (mud) to kill thewell or acid to improve well production.
Flow line: to control the flow. Normally
closed.
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Flow Head-Description
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Flow Head-Swivel
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It allows rotationof subsurfaceequipment.
It supports theweight of the drill
string thanks toroller bearings.
It supports also
the weight of the
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Flow Head-Four common operations
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Build up and set packer
Drawdown
Killing and acidizing
Running tools downhole
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Choke Manifold
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q Four gates valves
q A fixed Chokeq An Adjustable
Choke
q Tapping points formeasurement upand down streamchoke
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Main functions of ChokeManifold
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s Safety function: control of the well headpressure.
s Allows different choke sizes: control theFLOWRATE.
s Prevents water and gas coning:limitation of flow rate.
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Choke Manifold
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Adjustable Choke Fixed Choke
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Emergency Shut DownSystem
Well closure: The ESDinitiates well closure whenthe pressure in the flowline either rises above ahigh-level threshold or fallsbelow a low-levelthreshold.
The ESD is mandatory
when the wellheadpressure exceeds 5,000psi, whenever H2S ispresent, or in highpressure/temperature/flowrate conditions.
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Separator
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17q Pressure vessel used to separate well
fluids into gaseous and liquidcomponents.
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Separator-Design
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18Types
Two phase - Gas and liquids
Three phase - Gas, oil and water
Designs
Horizontal
Capacity, separation efficiency, maintenanceVertical
Less floor space, foreign material, liquid levels
Spherical
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Separator
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19 Must be able to handle exploration wells
where the nature of the fluids is notknown prior to the start of the test.
Must be able to deal with light oil, heavyoil, foaming crudes, gas condensate,waxy crudes.
Must be able to cope with H2S andpossibly CO2
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Separator
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20The Separator will provide a means for
metering of the various fluids
permit sampling of the fluids
allow for the removal of water from the oil
containing the pressure safely within thepressure envelope
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Separator
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f
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Separator-Safetyinstruments
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22 Automatic Control Valves
Non Return Valve
Cork Valve Sight Glasses
il
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Separator-Gas & OilMetering
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23 Gas Metering
Daniel Orifice Meter
Oil Metering
Rotron vortex meter
Floco positive displacement meter
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Gauge tank
Storing liquids when pressure is low
Storing liquids when large samples are required
Metering liquids when flow rate is low
Calculating the volume correction factor at the tank tocalibrate oil meters
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-Meter
factor.-Shrinkagefactor.
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Surge tank
Whenever H2S is expectedto be in the well effluent, asurge tank must be usedinstead of a gauge tank.
Storing liquids whenpressure is low
Storing liquids when largesamples are required
Metering liquids when flowrate is low
Calculating the volumecorrection factor at the
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-Meterfactor.-Shrinkagefactor.
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Oil Manifold
The oil manifold linksthe separator to thetank, the transferpump, and theburners. It allows oilleaving the separatorto be diverted to thetank or the burners, orsent directly to a
production line.
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S.W.O.T Analysis:
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28 Strengths:
Cutting-Edge Technology
Global Experience, Local knowledge &expertise
High Quality of service
Maximum Satisfaction & Retention ofclients
In time job completion
Affordable service cost to clients
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S.W.O.T Analysis:
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29 Weaknesses:
Lack of Backup equipment
Lack of Specifically designed Trainee Engineer
Program
Limited infrastructure as compared to competitors
Limited Services available for clients
Lack of Research & Development budget, Policies& well defined procedures
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S.W.O.T Analysis:
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30 Opportunities:
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S.W.O.T Analysis:
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31 Threats:
Strong Competition in Industry
Limited Infrastructure
Loss of business due to limited infrastructure &services provided to the client
Lack of confidence in services from safety
conscious clients
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Surface Well Testing
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