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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…