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Rejuvenation of a mature oil field: Underground Gas Storage and Enhanced Oil Recovery, Schönkirchen Tief Field, Austria

IEA-EOR Conference 2009

Torsten Clemens, Joop de Kok, Yannick Yanze

2 | Torsten Clemens, Joop de Kok, Yannick Yanze

Gas supply shortage in 2008


Outline

Reservoir overview Concept Underground Gas Storage (UGS) + Enhanced Oil

Recovery (EOR) Simulation setup Optimization of UGS Dewatering Cycling EOR Conclusions


Reservoir overview

Highly fractured dolomite Water- to mixed wet 19 mn Sm3 STOIIP GOC at 2550 mss OWC 2740 mss Producing since 1962 Current recovery factor 59

% Water flooded

-2750

-275

0

-275

0

-275

0

-275

0

-275

0

-2750

Dummy 1

Dummy 2

G T 002

RE T 002

ST 058

ST 052

MA 125

ST 011

ST 038a

ST 042

ST 049ST 090

ST 080a

STRT 003

STRT 002

ST 090a

ST 078

ST 069

ST 067

ST 064

ST 062

ST 059

ST 057

ST 056

ST 051

ST 050

ST 048

ST 047

ST 028

ST 021 old

ST 017

ST 012

ST 007 old

ST 006 old

ST 046

ST 045 SP

ST 044

ST 041ST 040a SP

ST 039ST 038

ST 036

ST 034

ST 033 SP

ST 032

ST 031

ST 030a

ST 029

ST 027

ST 026

ST 025

ST 024

ST 023

ST 022

ST 020

ST 019

ST 018

ST 016

ST 015

ST 014

ST 013

ST 010

ST 009a

ST 008

ST 005

ST 004

ST 003ST 002

ST 001

P UET 002aP UET 002

P UET 001

P T 014

P T 012

P T 011

P T 010

P T 006

TAL W 002

OLL W 002

OLL W 001

MA T 003

MA T 002aMA T 002MA T 001

G UET 001bG UET 001aG UET 001

BO T 003aBO T 003

P T S 001

P UET 001a

P T 009P T 008

P T 007

P T 005

P T 004

P T 003

P T 002

P T 001

522400 523200 524000 524800 525600 526400 527200 528000 528800 529600 530400 531200 532000 532800 533600 534400 535200 536000

522400 523200 524000 524800 525600 526400 527200 528000 528800 529600 530400 531200 532000 532800 533600 534400 535200 536000

5354

400

5355

200

5356

000

5356

800

5357

600

5358

400

5359

200

5360

000

5360

800

5361

600

5362

400

5363

200

53544005355200

53560005356800

53576005358400

53592005360000

53608005361600

53624005363200

-2900-2850-2800-2750-2700-2650-2600-2550

Depth

0 500 1000 1500 2000 2500m

1:37500


Historical production – initial conditions


Historical production – initial oil production phase


Historical production – perforation higher


Historical production – water injection


Historical production – current conditions


Sorw = 25%

Historical production – current conditions


Underground Gas Storage & EOR - fractures


Sorw = 25%

Sorg = 15%

Underground Gas Storage & EOR - matrix


Simulation setup

Is it possible to build up the required volumes of gas? How long does it take to build up the UGS? Is dewatering required? How much cushion gas is required to safely produce the gas

volumes? How many wells are necessary to inject and produce the

required gas volumes? Where to place the injection / production wells? What are the risks and uncertainties? Is there any EOR potential? Is there an opportunity to accelerate current production?


Dual-permeability approach: two superimposed grids

Fracture grid

fracture-fracture exchanges

Matrix grid

matrix-matrix exchanges

Pm, Sm

Pf, Sf

unknowns

km, m

kf, f, σinputproperties

matrix-fracture exchanges

Simulation setup


History match

Multiple history matches Multiple predictions


Optimization of UGS – phased approach

0.5 2.5 5.5

Time in years

Phase 1

Tota

l in

ject

ed g

as

[b

illio

n m

³] 3

2

1

0



0.5 2.5 5.5

Time in years

Phase 1 Monitoring phase

Tota

l in

ject

ed g

as

[b

illio

n m

³] 3

2

1

0



0.5 2.5 5.5

Time in years

Phase 1 Monitoring phase

Phase 2

Tota

l in

ject

ed g

as

[b

illio

n m

³] 3

2

1

0


Dewatering to increase gas volume

0 0.1 0.2 0.3 0.4 0.5 Time in years

1.5

1.8

0.9

0

0.6

Without dewatering

Tota

l in

ject

ed g

as

[bill

ion m

³]

0.3

1.2



0 0.1 0.2 0.3 0.4 0.5 Time in years

1.5

1.8

0.9

0

0.6

Without dewatering

With dewatering

Tota

l in

ject

ed g

as

[bill

ion m

³]

0.3

1.2



Original oil/water contact

Vertical dewatering wells

Water injection into sandstoneHorizontal gas injection wells


Gas/liquid contact movement in the fractures

0.00E+00

2.00E+08

4.00E+08

6.00E+08

8.00E+08

1.00E+09

1.20E+09

1/3/11 29/6/11 27/10/11 24/2/12 23/6/12 21/10/12

DATE

FG

IT,

FG

PT

(S

M3)

-2720

-2700

-2680

-2660

-2640

-2620

-2600

-2580

-2560

-2540

-2520

GO

C F

RA

C (

MS

S)


UGS & EOR - concept

Downdip production wells

Original oil/water contact

Crestal gas injection wellsOil rim

Residual oil 25 %

Residual oil 15 %


Enhanced Oil Recovery (EOR)

2008

2030


Enhanced Oil Recovery (EOR)

Production of incremental oil after several cycles

Up to 5 % recovery of incremental oil in place


Effect of gas cycling on oil production


Gas/Oil Contact in Fractures and Matrix

Gas Injection Gas Production

Gas/Oil Contact in Fractures

Water/Oil Contact in Fractures

Gas/Oil Gravity Drainage in Matrix

Gas/Oil Gravity Drainage in Matrix

Well Well

Gas invasion in matrix

Gas invasion in matrix


Conclusions

Schönkirchen Tief is good candidate reservoir for high

performance Underground Gas Storage

1.5 bn m³ gas can be injected in phase one and 3 bn m³ gas

in phase two (dewatering required)


Conclusions

Schönkirchen Tief is good candidate reservoir for high

performance Underground Gas Storage

1.5 bn m³ gas can be injected in phase one and 3 bn m³ gas

in phase two (dewatering required)

De-watering can be optimised by drilling vertical wells deep

below the original oil/water contact

Enhanced Oil Recovery can be achieved due to the

difference in residual oil saturation towards water and gas

Up to 5 % incremental oil can be recovered


Acknowledgements

Thanks to:

OMV E&P for the permission to publish this paper

omv exploration & production move & more. rejuvenation of a mature oil field: underground...

Documents

yannick yanze slide

torsten clemens

yannick yanze simulation

yannick yanze sor w

current production

cushion gas

required volumes of

required gas volumes