Neven Leonard, Nenad Smontara

CO2 ROZ Conference, Midland, Texas,

08.12.2016.

CURRENT STATUS OF EOR CO2

FLOODING PROJECT IN CROATIA,

CONTENT

• 1. INTRODUCTION,

• 2. REASONS FOR STARTING EOR PROJECT,

• 3. EOR PROJECT REALIZATION,

• 4. EOR MONITORING & RESERVOIR SIMULATION

• 5. CONCLUSION

EOR PROJECT PREPARATION

1978 – 1991, ”SCREENING” PHASE FOR 14

LARGEST OIL FIELDS IN CROATIA

EXAMING CO2 PVT CONDITIONS – ORIGINAL OIL

NUMERICAL SIMULATION OF TERTIARY

PHASE OF OIL PRODUCTION

CO2 PILOT PROJECT ON IVANIĆ 2001. – 2006.

EOR – CO2 SOURCE

Ivanić

&

Žutica

GTP

Molve

EOR – CO2 INJECTION QUANTITIES

Ivanić

Žutica North

• INJECTORS:

22 WAG, 8 DISPOSAL

PRODUCERS: 76

Žutica South

INJECTORS:

17 WAG, 5 DISPOSAL

PRODUCERS: 85

1st

PH

AS

E

GTP Molve

Facilities: CO2 Compressor stationFacilities: CS CO2, Liquefaction

and pumping station

CS Žutica

GTP Ethane

Facilities: Membrane separation

unit

2n

d P

HA

SE

30 000 000 m3

1.1 * 109 cuft

injected

Scope of 2016/2017

CO

MP.

EOR PROJECT - TECHNICAL CONTENT AND SIMPLIFIED SCHEME

COMP. ST.

ŽUTICA

IVANIĆ

ŽUTICA

PUMP

200 barLIQUEFACTION

CO2

88 km100 bar

ETHANE

PLANT

MEMBRANE

SEPARATOR

CO2DEH.

DEH.COMP.

30 bar

LO-CAT

Refinery

600 000 m3/d

COMP.

GTP MOLVE – CO2 SOURCE

20”

• Installed electric energy 5.5 MW • 3 x 1.8 MW Compression 0-30 bar (0-435 PSI),

21 * 106 cuft/day CO2

• CO2 Dehydration unit • TS 35/3.3/0.4 kV, DCS

GTP ETHANE

Cooling

tower

CO2

pumpCompressor

for CO2

Molve

Ivanić & Žutica

oilfields

CS CO2 Ethane

TS building

heat exchanger & cooling towers

• Rated power 2.1 MW • 2 x 0.71 MW Compression 30-90 bar

(435-1305 PSI), 21 * 106 cuft/day CO2

• CO2 cooling – cooling tower• CO2 pumps 90 to 200 bar (1305-2900 PSI),

2x200 kW• TS 35/10/0.69/0.4 kV, DCS

CONSTRUCTION OF PIPELINE NETWORK

Installed pipelines network:

• CO2 colector pipeline 8” – 9340 m• Oil field Ivanić pipelines 11500 m : 8” – 550 m,

6” – 5782 m,4” – 1772 m,2” – 3500 m,

CO2 section nodes – 4.

• Oil field Žutica pipelines 20200 m : 8” – 3700 m,6” – 7550 m,4” – 2400 m,2” – 6550 m,

CO2 section nodes – 6.

41040 m pipelines, 10 CO2 nodes

EOR SUB-SURFACE ACTIVITIES 2012

• Pilot re-lining on the well Žu-111Successfully finished in April 2012 !

• mandatory (based on Mining project ) re-lining with NEW CASING,• prepared and designed by INA internal resources - Drilling & Well Services Management,

RE-LININGBEFORE AFTER

EOR SUB-SURFACE ACTIVITIES 2013

• 49 wells (37 WAG + 12 disposal) re-lining with NEW CASING: 4” or 31/2”

4” casing

successfully

installed

EF IVANIĆ FIRST RESULTS OF CO2 INJECTION

12

Exploitation field Ivanić:- 43 production wells;- 2 measurement wells;- 14 WAG injecton wells (2 without permit);- 5 water injection wells;- 2 substitute WAG wells CO2.

CO282

852

63

54

31

18

28

5984

46

5

7

EF Ivanić first results of CO2 injection

13

Exploitation field Ivanić:- 43 production wells;- 2 measurement wells;- 14 WAG injecton wells (2 without permit);- 5 water injection wells;- 2 substitute WAG wells CO2.

CO282

852

63

54

31

18

28

5984

46

5

7

10

Ql Qo Qw Qg Cycle

bbl/d bbl/d bbl/d cuft/d h

1.'14. 0 0 0 0

3.'15. 120 3 117 3320

4.'15. 60 3 57 1660 6 x 2h

01.'16. 264 12.6 251.4 6074 24 h

04.'16. 330 15.6 314.4 10488 24 h

07.'16. 492 34.8 457.2 96444 24 h

08.'16. 288 20.4 267.6 56433 24 h

09.'16. 198 13.8 184.2 38811 24 h

11.'16. 636 75 561 807964 24 h

12.'16. 624 87.6 536.4 704139 24 h

Iva-7 Method

artificial

lift

natural

flow

Ql Qo Qw Qg Cycle

bbl/d bbl/d bbl/d cuft/d h

1.'14. 6 5.94 0.06 1695 2 x 2h

7.'15 102 3 99 4414 24h

04.'16. 108 3 105 10347 24 h

07.'16. 318 15 303 181906 24 h

08.'16. 282 53.4 228.6 556206 24 h

09.'16. 120 19.8 100.2 488190 24 h

10.'16. 120 19.8 100.2 488190 24 h

11.'16. 78 24.6 53.4 762550 24 h

Iva-10 Method

artificial

lift

natural

flow

EOR IVANIĆ - MONITORING

Prior to the start of CO2 injection, initial conditions of the 43 production wells were

determined.

Continuous measurements of fluid quantities on all production wells with 3-phaze

metering separators to detect any increase in oil production (hundreds of

measurements)

Detection of CO2 concentration in associated gas on production wells resulted in

the ability to make timely decisions for interventions in production wells

Continuous fluid level measurement on all production wells

Well logging measurements (production logs) in injection and production wells for

monitoring CO2 injection profiles of the targeted reservoirs

PRODUCTION LOG MEASUREMENT

Collected data used for calibration of existing numerical model for Ivanić oilfield,

and better comprehension of the oil displacement process

The numerical model was crucial in understanding and managing unexpected

quantities of produced fluid from the production

Current Ivanić E300 model is being continuously updated to increase it’s

predictive accuracy

Major obstacle in the quality is field production using SRP’s;

When wells start to flow naturally, predictive power of the model is expected to

improve

The model has been able to predict the quick CO2 breakthrough in Iva-13

producer

An ongoing campaign to improve vertical and horizontal sweep efficiency

(production/injection profile harmonization, detailed production measurements)

MONITORING DATA VITAL FOR RESERVOIR SIMULATION AND

RELIABLE PREDICTIONS

GAMMA RESERVOIR CO2 SATURATION: OCTOBER 2014 – NOVEMBER 2016

275.00.000 m3 CO2 injected - 9% HCPV

MONITORING DATA VITAL FOR RESERVOIR SIMULATION

• Besides, updating the model with production data.

Sensitivities are being run in order to estimate

expected EOR increment;

• Expected impact is being manually shifted by using

cum CO2 injected (as %HCPV) vs. expected

increment;

• By doing so, better fit to actual pilot is being achieved

while keeping expected recovery constant.

2016 = 18 000 m3

OIL FIELD IVANIĆ – FIRST RESULTS

CONCLUSION

• Incremental oil production: 3,9 * 106 m3 / 3,4 *106 t(22.6 * 106 bbl)

• Incremental gas production: 599 * 106 m3 (21.2 * 109 cuft)

•Prolonged oil and gas production of Ivanić and Žutica mature fields (for the next 25 years)

•During the project, the total of: 3,55 *109 m3 / 6,94 *106 t (125 * 109 cuft) CO2 will be injected

•Expected re-production of: 0,8 mlrd. m3 / 1,50 mil. t (28 * 109 cuft) CO2

• CO2 retention in the reservoir: 2,78 billion m3 / 5,44 million t(97 * 109 cuft)

THANK YOU FOR YOUR ATENTION !!!

SRETNO !!!