What is Coiled Tubing Concentric Coiled Tubing (CCT) · Concentric Coiled Tubing && applications in...
Transcript of What is Coiled Tubing Concentric Coiled Tubing (CCT) · Concentric Coiled Tubing && applications in...
5/22/2012
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Mounir AbabouMounir Ababou
Technical Manager, Baker HughesTechnical Manager, Baker Hughes
Pressure Pumping Pressure Pumping –– OmanOman
May May 20122012
Concentric Coiled TubingConcentric Coiled Tubing& & applications in Tar Mats applications in Tar Mats
Third EAGE/SPE Workshop on Tar MatsThird EAGE/SPE Workshop on Tar MatsAbu DhabiAbu Dhabi
Objectives
•• CCT overviewCCT overview
•• ApplicationsApplications
•• New TechnologiesNew Technologies
•• Way forwardWay forward
What is Coiled Tubing Concentric Coiled Tubing (CCT)
•Coiled Tubing inside another
Coiled tubing
•Works on Jet pump technology
1.75” inner CT 2 7/8” outer CT
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Fluid ReturnFluid Return
InjectionInjection
CCT – Average pumping rates
1” pipe (60-80 lpm)
2” pipe (100-160 lpm)
2” x 1” CCT
Vacuum Pump (jet pump)
2 1/8” & 2-1/2” ODs
Pressure & temperature
memory gauge
Velocity
CCT Vacuum Technology
Intake screen
Power fluid
Returns
Well-Vac / Sand-Vac?
• It is the same tool, but has different modes
• Well-Vac mode has no external jets
• Sand-Vac mode has external jets to agitate and fluidize sand
Tool Graphic
Forward Jetting
Reverse Jetting
Wellbore Fluid &
Solid Intake
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Tool Graphic – Sand Vac mode
Forward Jetting
Reverse Jetting
Wellbore Fluid &
Solid Intake
• Solids and fluid vacuuming
• 22.5 gpm power fluid rate
• 20% of power fluid diverted externally to
fluidize solids ( ~ 4.2 gpm)
• Wellbore suction rate of 2.9 gpm
Tool Graphic – Well Vac mode
Wellbore Fluid &
Solid Intake
• Fluid vacuuming only
• All power fluid routed to jet pump
• Increase wellbore fluid recovery
Tool Graphic – External jetting mode
External Jetting – 100% fluid out
CCT & WellVac Tool Video
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CCT Applications• Acid Stimulation
• Sand clean outs
• Inflow profiling (determining
how much sand/water/Oil produced across each meter interval)
• MPLT
• Removing schmoo from injectors
• Acid flow back from H2S wells
• Others: hot water injection to induce flow thick crude & PVT sampling
•CCT/WellVac technology allows cleaning wells with
2,500Kpa (360PSI)BHP using only water•NO Foam/Nitrogen is required
Note: the screens are 2.5mm opening
The challenge of cleaning Sand from low pressure reservoirs
CCT fully rigged up
CT Tower allows safe extended
job time – Weight is sustained by
tower, not by any crane
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Return line – Green color
Choke Manifold
Return Tank/Desander
Sampling point
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Surface Returns / Sampling
Oil mixture
Oil layer
Formation water
Friction reduced power
fluid
Sand layer
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Amount of sand recovered Amount of sand recovered
within within 1515mnmnAmount of sand recovered Amount of sand recovered
in less than in less than 1515mnmn
An average of An average of 3 3 --7 7 MT of sand are regularly removed MT of sand are regularly removed
from client wells.from client wells.
0.0%
20.0%
40.0%
60.0%
80.0%
100.0%
120.0%
0
20
40
60
80
100
120
1410 1460 1510 1560 1610 1660
Oil
Cu
t /
Wa
ter
Cu
t
Gro
ss R
ate
(m
3/d
ay
)
Well#1 Inflow results
Net Rate m3/day
Wat. Cut
Inflow Profiling Results – Well #1
0.0%
20.0%
40.0%
60.0%
80.0%
100.0%
120.0%
0
10
20
30
40
50
60
1150 1250 1350 1450 1550
Oil
Cu
t /
Wa
ter
Cu
t
Gro
ss R
ate
(m
3/d
ay
)
Well#2 Inflow results
Net Rate m3/dayWat. CutOil cut
Client can decide to
seal this water zone
Draw down generated downhole Horizontal Water injector plugging
• Newly drilled horizontal injectors plugging after few
weeks injection
• 6 1/8”O.H x 1,000m long
• Acid Stimulation unsuccessful onto solving the issue
• Client wanted to know plugging mechanism
• CCT was RIH and managed to recover the virgin
plugging materials across all the O.H section
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Horizontal Water injector plugging•8-day production test in a Oxy well.
•CCT used to clean up the drilling fluid and then determine a stable
oil production and drawdown pressure from the zone.
•The Oil viscosity was 2,000 cp at 120 F (formation temp 120 - 125 F).
•Initially the tool intake screen plugged frequently and pumping had
to be stopped to flush the screens.
•After about 20 hours, the drilling fluid was cleaned up and a stable
production rate & drawdown pressure were achieved & the job was
successful.
•CCT work in the East Venezuela heavy oil fields deal with 2,000 –
3,000 cp oil.
•In Canada the oil was also quite viscous, 5,000 cP at 25 C typical
CCT experience into removing thick Oil
Over Over 55,,000 000 cPcP oil cleanedoil cleaned
Exploration Well #1
5 7/8” Open Hole to
1,930 m
TOL 7”Liner 29 ppf @ 522 mtbf
13 3/8” 72 #, L80 NVAM @ 537 mtbf
9 5/8” 40# K55 VAMTOP @
592 mtbf
69 x 3 1/2” Tubing
20" 133# K-55 x 18 5/8" 87.5# K-55 BTC
CSG Shoe @ 216 mtbf ahbdf
5 7/8” Open Hole to
1,930 m
PHL packer at 560 m
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•CCT used as the main mean to product the well
•Demonstrate movable hydrocarbons in order to prove the
commerciality of the prospect.
•Collect representative hydrocarbon samples for a better
estimate of oil viscosity (best estimate is 1,500 cP).
•Collect bottom hole PVT sample including the analysis of
H2S in the produced reservoir fluids.
Exploration well # 1 – Tar Mats/ Heavy Oil
Steam injected in
annular
80C Water
injected into
CCT
CHOKE MANIFOLD
10,000 psi
1
2
3
4
5
6
7
Turbine
FOS 100 bbl tankMBP Tank
SEPAR.
80
m3
80
m3
Baker HP Pump
75 – 120 l/min
40,000 KPa
Transfer Pump
To Flare pit
HP Pump 80 m3
SV
MV
CCT
WV
Casing Vent
‘A’ Annulus
SP
SP
SP
DH
FLOW CONTROL
CHOKE
Steam
PI&TI
BY-PASS
By-pass on separator
utilised.
Hot Water
80 C
150
l/min
250 psig
Hot Water
Vent
PR
RO Feed Water
SV
Steam 180
C
20-50 gpm
2,150 psig
Steam Vent
PR
Hot water/ Steam Injection
Radiating heat into reservoir
Attempt improve Oil mobility
•Circulate 80C water continuously for several days
•Inject 180C steam intermittently in the annular
•Keep producing well circulating 80C water in the CCT
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Attempting to improve Oil Mobility
Attempt improve Oil mobility
Results
•Formation water only circulated out – one spot of crude oil
recovered at the BHA
•PVT sample run using CCT
•MPLT run using CCT
•CCT required again in this well #1 to remove a certain quantity of
formation water and replace it with optimised brine for accurate real
time logging using TeleVac
•Exploration well # 2 will call for 3 weeks continuous pumping
In January 2012, CCT recovered 50,000 cP + waxy/Asphaltenic material
from water injector
•3.3% Ashphaltenes
•1-2% Oil & Wax
(containing 5% C18)
•38% iron sulfides
•57% other irons
Computer Modeling
2” concentric
1” Pipe
Friction reduced water
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The next step: combining Telemetry
cable & CCT BHA into TeleVac Technology••TeleVac Technology TeleVac Technology
Launched May Launched May 1212, , 20122012
••Possibility to run logging Possibility to run logging
tools while pumping special tools while pumping special
solvents/ producing wells solvents/ producing wells
with CCT are opening new with CCT are opening new
horizons horizons –– This is a break This is a break
through for the Oil Industrythrough for the Oil Industry
Telemetry cable parameters
BakerBaker
• Mono copper cable
• Isolated by rubber sheath
• Engulfed in steel pipe
Conclusions
• CCT can provide field solution to produce
heavy oils and obtain downhole sample
• Advances in technologies would allow hotter
fluids to be pumped
• New CCT logging capabilities will certainly
open up horizons that were not accessible few
months ago.
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Thank you….Thank you….
End of presentation…discussion…End of presentation…discussion…