COMPLETION INTERVAL

STATOIL A/S Well 7120/7-2 Page 3 of

Casing Size Meters

30 "from 263 m to 325 m

•

Material Consumption for Interval:

Product

BariteItyoming BentaniteCaustic SodaSoda Ash

Material Cost for Interval & 16.171.18

Number of Days^ 4

(Bit Size) Meters

36 " hnte from 263 m tn 326 m

Units

31

27

18

8

Size

MT

MT

25 kg

50 kg

Cost/Unit

$ 151.20

403.60

22.47

22.79

Total Cost

$ 4,687.20

10,897.20

404.46

182.32

Average Cost per meter $ 260.83

Average Cost per Day $ 2,042.80

Comments

Drilled this section with seawater, and 6 m of spud mud was spotted at each

connection. The hole was .displaced with mud, 40 m of 1.23 s.g. prior to running

30" casing.

PRENTA/S-MMONES

COMPLETION INTERVAL

COMPANY. STATOIL A/S Well 7120/7-2 Page. of.

Casing Size

20

Material Consumption for Interval:

Product

Barite

Wyoming Bentonite

Caustic Soda

Bicarbonate of Soda

Pro - Defoamer

Soda Ash

;rs

o 365 m

Units

65

21

17

12

1

5

(Bit Size)26

Size

MT

MT

25 kg

50 kg

25 l t r

50 kg '

" hnlfi from 326 m

Cost/Unit

$ 151.20 $

403.60

22.47

26.57

72.19

22.79

Meterstn 370 m

Total Cost

9,828.00

8,475.60

381.99

318.84

72.19

113.95

Material Cost for Interval $ 19,190.57

Number of Days ^ 5

.Average Cost per meter $

.Average Cost per Day $

436.15

3,838.00

Comments

Drilled 12 1/4" pilot hole to 410 m. Cemented back to 350 m. Drilled 26" hole

to 370 m using underreainer.

PRENTA/S-MNONE5

COMPLETION INTERVAL

r.r>MPAMY STATOIL A/S Well Mn 7120/7-? Page. of.

Casing Size Meters

13 3/8 » f r o m 263 m to 800 m

(Bit Size) Meters

17 1/2 "holefrom 365 m to 815 m

Material Consumption for Interval:

Product Units Size Cost/Unit Total Cost

BariteWyoming BentoniteCaustic SodaBicarbonate of SodaUnical

36710128

MTMT25 kg50 kg25 kg

$ 151.20403.6022.4726.5722.60

$ 5443.202825.20224.70318.84180.80

Material Cost for Interval $.

Number of Days

8992.74 19.98.Average Cost per meter $

.Average Cost per Day $ 2997.58

Comments

Drilling of this interval conmenced after a 10 day industrial dispute, 20"csg. having been set at 365 m. The interval was drilled in 3 days withprehydrated bentonite. Logs were run satisfactorily and csg. set at 800 m.

COMPLETION INTERVAL

rOMPAWY STATOIL

Casing Size Meters

9.5/8" "from 263 to

Material Consumption for Interval:

Product

BARITE

CAUSTIC SODA

GYPSUM

MILPOLYMER 3 0 2

DRISPAC REGULAR

DRISPAC SUPERLO

PRODEFOAMER

WYOMING BENTONITE

SODA ASH

DETERGENT

UNICAL

Material Cost for Interval $ 5 9 6 8 6

Number of Days

WHII

1S0?

Units

95

31

142

128

30

15

7

1

1

1

10

, 61

C o m m e n t s _ . , , . . . . .Drilled this section witt

No problems encountered.

kin 7J2Q/7-9,

(Bit Size)

, ,_ Page.

19 V*4" "hnlftfrom 8 0 0

Size

MT

25 kg

40 kg

25 kg

50 lbs

50 lbs

25 1

MT

50 kg

55 gal

25 kg

Average Cost

..- Average Cost

Cost/Unit

151,20

22,47

10,82

252,71

199,00

208,00

72,19

403,60

22,79

495,00

22,60

per meter $ F

4 of 6

Meters

to 1515

Total Cost

14364,00

696,57

1536,44

32346,88

5970,00

3120,00

505,33

403,60

22,79

495,00

226,00

nerDavS 5426,06

i GYP/Polymer mud.

- -

COMPLETION INTERVAL

nOMPAMV STATOH, A/S Well 7120/7-2 Page. of.

Casing Size Meters

7 " from 1349 m to 2519 m

(Bit Size) Meters

8 1/2 « hole from 1502 m to 2523 m

Material Consumption for Interval:

Product

BariteBentonite

Caustic Soda

Bicarbonate of SodaUnical

Drispac Superlo

Pro - Defoamer

Soltex

W.O. 21

Units

62

1

88

5

230

105

1

10

1

Size

MT

MT

25 kg

50 kg

25 kg

50 1b

25 l t r50 lb25 kg

Cost/Unit

$ 151.20

403.6022.47

26.57

22.60208.00

72.19103.95

273.26

Total Cost

$ 9,374.40

403.601,977.36

132.85

5,198.00

21,840.00

72.19

1,039.50273.26

4.

Material Cost for Interval & 40.311.16

Number of Days 24

.Average Cost per meter $_ 39.48

.Average.Cost per Day $ 1.679.63

Comments

After drilling out 9 5/8" casing shoe, the mud system was gradually convertedfrom a gyp-polymer to a dispersed Cel-Lignosulfonate system. No problemsencountered while drilling this section.

COMPLETION INTERVAL

COMPANY. STATOH, A/S Well 7120/7-2 Page. of.

Casing Size

"from

Material Consumption

Product

Meters

to

for Interval:

Units

(Bit Size)

Size

" hole f mm

Cost/Unit

Meters

tn

Total Cost

Materials used during logging and testing. Including correction on inventory

when well finished.

Barite

Caustic Soda

Drispac Regular

Bicarbonate of Soda

Salt

XC - Polymer

Soda Ash

Lime

W.O. 21

32

5

34

48

195

5

5

1

3

MT

25 kg

50 lb

50 kg

50 kg

50 lb

50 kg

40 kg

25 kg

$ 151.30

22.47

199.00

26.57

11.55

393.80

22.79

10.82

273.26

$ 4,838.40

112.35

6,766.00

1,275.36

2,252.25

1,969.00

113.95

10.82

819.78

Material Cost for Interval s 18,157.91

Number of Days 24

.Average Cost per meter $_

.Average Cost per Day $ _ 756.58

Comments

DAILY DRILLING MUD ADDITIONS

Contractor. SMEDVIG

Rig No.. WEST VANGUARD

_OPERATOR_

Well Nam*_ And No.

STATOIL A/SLEGAL

.DESCRIPTION.

7120/7-2 .Field. TROMS0FLAKET .COUNTRY. N3RWRY

Promud a/*Warehouse _ TANANGER

S p u d

. Date Days To T.D..DATE T.D. , _ , TOTAL TOTALREACHED 21 /7 /83 . D E P T t < 2523 m. C O S T t 162,510.17

/ /// 0 J7I//I //?./// lWJ7fJ/£ / / / / / / / / / /// 'i/iJ7ii/is/i / / / / /

OATC

25/526/527/528/529/5

30/531/5

1/62/63/6

4/65/66/67/6

STRIKE

17/618/6

OEPTH

300.296326325

325410

370370365

365365365365

365365

/

/ 4

3

521

2

31

916

231765

31

1

82

566

27

2

B47

1

52

344

18

14

116

44

8

1

4

f///W ///////////4

R

1

1

3

2

)" CS

|»" CS

; SET

; SET

CT 325

ff 365

H

M

\

/

/OAILV COST

3,341.151,305.742,841.415.777.842,905.04

2,213.262,687.443,553.715.114.475,621.58

19,190.57

4.687.20NIL .NILNIL

NIL554.80

CUMULATIVECOST

3.341.154,646.897,488.30

13.266.1416,171.1816.171.18

18,384.4421,071.9924,625.7029,740.1735.361.7535.361.75

40.048.9540,048.9540,048.9540.048.95

40.048.9540,603.75

o»tn 18/6/83. North Sp_a- _ Region Norway. PAGE. _OF_

DAILY DRILLING MUD ADDITIONS

Contractor. SMEDV1G

Rig No.

Promud a/tWarehouse _

WEST VANGUARD

_OPERATOR_

Well NameAnd No

STATO1L A/SLEGAL

.DESCRIPTION.

7120/7-2 -Field TROMSflfLAKET .COUNTRY. NORWAY

TANANGERSpud , , . , , „ , No. DrillingDate Z 6 / 5 / B J - Days To T.D..

DATE T.D. TOTALREACHED 21/7/83. DEPTH 2523 m.

TOTAL.COST $ . 162.510.17

DATE

i»83119/6

20./621/6 I

21/6

237624/6

25/626/6

T77628/629/6"3076

1/7

2/73/7

4 /7

DEPTH

meters

385

668815

815"8f5~J77[997227

13901515

151515151515

515

1610I734

1850

/7 A

436

10

102

11506

6

95

• ' ' (

337

11

yd"10

10

24

136

13

2

31

8

i1

4

R

12

3

/ *

1122S433

11

11

142

/ ^3

5

8

10

10

1540

#/

V / JP/VK,

122

1

1

7

/A

822

_!Q_36

12

m

12R

U$j/j$/ / / / / / / /^ y V / / / / / /

6

5.11

1

7

ID

3

15

13

1

1 ._

3/8" pSG SE

9 5

r AT 8i

'8" CSC

0 M

SET , ,T 150! M

/

/DAILY COST

174.081,761.061,815.608.992.74

2,185.648.665.73

13,862.1712,225.221.735.39

10,734.011.797.617,559.45

995.00NIL426.39

39,686.61

3.199.71339.00

1,083.76

CUMULATIVECOST

40,777.ftl42,538.8944,354.4944.354.49

46,540.1355,205.8669,068.038i;293.2583.028.6493,762.6595,560.26

103,119.71103,614.71103.614.71104,041.10104,041.10

107,240.81107,579.81108.663.57

n a U , 4/7/83.Pro mud a/s

.Technical Representative S0rb0/Bergllnd/Gravdal/Sol^. t r l t. tWest.

North Sea. Norway. PAGE 2 OF 5

DAILY DRILLING MUD ADDITIONS

Contractor. SMEDVIG

Rig No. WEST VANGUARD

.OPERATOR..

Well NameAnd No

STATOILLEGAL

.DESCRIPTION.

7120/7-2 Field TROMS0FLAKET NORWAY

DATE T.D. TOTALREACHED 21/7/83. DEPTH

DATE

d«3 1

5/7

_6777/78/79/7

10/711/712/713/714/715/716/717/718/719/720/721/722 n23/724/725/7TOTAL:

/

OtPTH / ^

meter* /

1955

2021211521632174

218422082226

_2245_2285

1360

.232124122455

247025212523

252125232523

2523

3

20

553?

3

76^

62

WMi////M//////////6

6

10

553

245

S26

722

2251

88

22

23

20

181010

1010

11

11

5

10

105

230

5

3

103

53

712

•j

313

312

251

105

1

1

10

10

2

5

1

1

1

1 7" LINER D f "ERVAL

7/DAILY COST

2,197.811,278.623,024.003,796.20

624.001,559.15

962.35293.41

2.256.943,567.88

791.951,038.751.122.54

CUMULATIVECOST

110,861.38112,140.00115,164.00118,960.20119,584.20121,143.35122,105.70122,399.11124,656.05128,223.93129,015.88130,054.63131.177.17

3,087.421 134,264.591,083.044,154.14

157.94270.94460.94

2,710.011.250.67

40,311.16

135,347.63139,501.77139,659.71139,930.64 "140,391.58143,101.59144.352.26

Data 25/7/83.Promud a/s

.Technical Representative. McKenzie/Sola/S0rtx». . District. North Sea. .Region. Norway. PAGE 3 QF 5

!DAILY DRILLING MUD ADDITIONS

Contractor

Rig No.

Promud a/sWarehouse

DAI I

n»83i26/727/728/729/730/731/7

1/82/8

3/84 /85/8

6/87/88/8

9/810/811/812/8"13/814/8

15/816/8

17/8

Date

DEPTH / 42523'2523

_252i25232523

-2521,25213]2523

.252125232523

J5212521J252~3l

252325232523"252T25232523

2523.2523, „ ,

3

11

17/8/83.

SMEOVIG OPERATOR STATOILLEGALDESCRIPTION

Well NameWEST VANGUARD And No. 7120/7-2 Field TROMS0FLAKET COUNTRY

SpudTANANGER D a t a 26 /5 /83 .

No. DrillingDays To T.D.

DARE

TET.DACHEC

TI 21/7/83. C

OTALEPTH 2523 m.

£ ^44f•'^'$ty• ^ z/^x '^v7 / / / / / / / / / / / / / / / / / / / /

1

NO

23

9USAGE

1j

10

52

21

23

!

195 5

'romud a/sFechnical Reprassntativn District

/£ <f / / o /̂/ o^/ f/f / / / / / / oV / oV/ if

/ / / / / / / / /

Nor th Sea. Rnglon Norvray.

NORWAY

TOTALCOST $ 162,510.17

/ / / /

// if

/oAlLV COST

420.471,154.971,791.00

NIL652.60451.14

2,601.111,663.20

1.058.404,221.25

995.00

398.00N I LN I L

NILN I LN I L

N I LN I L

N I LNILN I L

NTTi

/

CUMULATIVECOST

144.772.73145,927.70147,718.70147.718.70148,371.30148,822.44 -151,423.55153,086.75154.145.15158,366.40159,361.40159.759.40159,759.40159,759.40159.759.40159,759.40159,759.40159,759.40159,759.40159.759.40159,759.40159,759.401S9.7V) AO

PAGE 4 OF S

1 DAILY DRILLING MUD ADDITIONS

Contractor. SMEDVIG

Rig No.

Promud a/sWarehouse .

WEST VANGUARD

_OPERATOR_

Well Name_ And No

STATOILLEGAL

.DESCRIPTION.

7120/7-2 Flald TRCMS0FLAKET COUNTRY NORWAY

TANANGERSpud

.Oate_No. I

. DaysToT.D..DATET.D. TOTAL TOTALREACHED 21/7/83. DEPTH 2523 in. COST » 162.510.17

// J7fj/f of// PTiJ'/77f"jfr/7i J7l~f?i ifflTj ifi f/7 ifi /// «,*// /// / /

OATE

IM83I18/819/819/8

DEPTH

25232523

- / '

83

3245 34

248

•

195 5s5

11 3

)' /

(TN

/

'FMTDR TTTna•rcrrA j INTE RVAL

/

/DAILY COSTCUMULATIVE

COST

1,209.60 160.969.00453.6& 161,422.60

. 1,087.57i 162,510.1718,157.91

Promud a/sData 19/8/83. Technical Representative. .District. North Sea.

B » P i o n " ^ y - PAGE_J> OF 5

DRILLING MUD RECAP

Contractor SMO3VIG

Rig NO. WEST VANGUARD

. _ . OPERATOR—

Well NameAnd No

STATOILLEGAL

.DESCRIPTION.

7120/7-2 _ Field TROMSgnAKET .COUNTRY. NORWAY

Promud a/sWarehouse. TANANKER

Spud No. Drilling DATET.D. , 1 / 7 / R , TOTAL TOTAL.Date 26 /5 /B3 Days To T.D REACHED ^ ' / ' / " • » • DEPTH **2i m- COST $

OA1L

25/526/527/5?8/S29/530 /S31/5

1/62/6V64/6Vfi6/67/6

17/618/619/6Pf)/fi21/6

23/624/6?Vfi26/627/6?ft/6?9/6

TIME

24002400240024032400

24002400

2400240074002400240024002400

24002400240024002400

?4nn240024002400240024002400

2400

DIPfMitiete'i

300296326325

325410

370370365365365365365

365365385668815R15777997

1227139015151515

1515

V. 1IPPVI

1.051.051.051.051.05

1.101.10

1.1Q1.101-101.101.101.101.10_MD1.10

1-101.111.121.14

i.tn1.101.101.151,251.25

.L25.1.25

i .

100+100+100+100+,60

654745454545454545

ISEB24048495248

47484843465055

52

r.

189

98

1010101010

&L_D;10

131211

7

109

1010131215

13

V.ILOr-HNi

..1 10IHM

SPUSPUSPUSPUSPU

2529

15262020202020

spirrp.10

23153740

242022212319

25

21

GtL1..1 lb lOOM-p

0 ll>

MUDMUDMUDMUDMUD

23/4020/3116/4324/413Q/5130/5130/5130/5130/51

10/2617/4013/5223/3630/35

6/96/86/76/14

11/2211/2515/5114/45

D H

9A

V.'105Til105

lOi10J

106

1Qf10711298

ins10Eio:10ai9.8

9,6

f ILl K A l ttml,A0 mm)

API

N/CN/C

N/CN/C1818

181818

18

1520

22.532

10108

7.59.5115

8.0

7.5

HI Hf ''tI3?mj

I K |

33333

3

2333111122

22

Al-jnnity

.7

.21.2

.55

.55

.55

.55

.55

.55

.3

.33

.48

.31

.18

.55

.30

.60

.2

.15

.15

.1

.1

P, M,

.4/.S

.15/35

.7A4

.2/.4•3/,e.y.t,3/.e.3/ .6.3/.C

.15/3J

.18/4(22/51.12/3"

,1 / , ;. 1 / . :X)5/3C. 1 / . :05/25X)5/2!

J35/3

05/.3

1 hllM'JvIMP11'}

8007500

45007100

800800

800800800

4500

55008300

1100013000

152Q01950019500200002000020000

20000

20000

CJIOUUI|pp..i,

20100

80100

00

000

40160240150280

12001200160016001520130014001460

Sjna1 oyVol 1

TRTR

TRTR

TRTRTRTRTR

TR

TR1/41/41/4

00

.2TRTRTR

TR

TR

'.>• >!•<]>1 • b y

555544

444

4

4577

4667

10101111

OnI1, byVo. J

wale*

Voi )

959b

9595

9696

969696

96

9695939J

9694949390908989

Mciliv-

22.520.020.020.020.020.020.020.020.0

20.027.517.522.525.0

_-

5 .010.017.517.520.020.0

Exces:Gypih/hH

2.02.03.43.02.62.2

2.1

2.1

118

131157190

128158130147155163

165

176

HL MARK!.

Mix spud mud.Drill 17 1/2" pilot- hnlp.Drill 36" hole.Ream 36" hole.Run and ant. 30" casing.Run riser.Drill 12 1/4" pilot hole.Open hole to 26".Pull r iser. Ream with 26"bitRun casinq. Cmt. Run riser.Pull r iser . Shut down.Rig shut down.Rig shut down.Rig shut down.

Return to r ig .Test BOP.Drill cmt. plug to 385 m.Drill to 668 m.Logging.Set 13 3/8" casinq.Cmt. 13 3/8" csg. DriJJ cant.Displ.to Gyp mud.Drr 1 2 ^ 4 'Drill 12 1/4" hole.Dril l . Increase mw. to 1.25.Drill 12 1/4" hole.Ream and wash wiper trips.logging. Run 9 5/8" casing.

D l , t e 29/6/83.Promud a/s

.Technical Representative. West/Sola. .District. North Sea. Norway- OF_

DRILLING MUD RECAP

Contractor _ SMEDV1G

Rig No.. WEST VANGUARD

.OPERATOR—

Well Name_ And No.

STAT01LLEGAL

.DESCRIPTION.

7120/7-2 Field TROMSgfLAKET .COUNTRY. NORWAY

Promud a/sWarehouse. TANANGER

S p u d

. DateNo.Drilllr.8Days To T.D..

DATE T.D. TOTALREACHED 21/7 /B3. D E pTH 2523 m.

TOTAL.COST S 162,510.17

U983'

30/6

1/72/7

1/74/7

V 76/77/7

fi/79/7

10 n11/712/7

11/714/7IS/716/717/7

1R/719/720/721/7

??n23/724/7

?V726/7

?7/7

2400

24002400

24002400

it rin24002400

24002400

24002400

r2400

?4002400

-MOO.24002400

24002400

24002400

240024002400

24002400

?4(M

DEPTHmeted

1515

15151610

17341850

20212115

71fi32174

218422082226

72462225

236023942412

24552470

25212523

252325232523

25232523

.*. 1

1.26

1.251.25

1.2«i1.25

1.2*1.32

1.3;

1*221.32

1.32

1.3;

1.1?1.321.32

1.3;

1.321.32

1.321.321.32

1 .1?1.33

1 33

F .

6 0 | 16 24

5448

5354

•n5158

5458

5.85550

5058545554

.64.56

5959

_5fiJ5454

5560

56

1419

1718

i f i

1418

1fi18161816

1719

1fi1817

?018

2020

If)1515

1516

17

2421

2020

1R

1518

1616

1616

151517141414

18141515

151313

1212

13

& in

13/42

10/357/36

9/389/38

q/lfi

5/329/39

8/378/378/375/325/27fi/255/245/214/205/19

5/194/174/154/15

5/143/134/12

4/124/15

4/18

95I

FILl H~Tl

imp 111 i

8 .0

9S|7.9B.37.7939il

SB.B.19£

32.98

.as.a7a9

aa9.7

aa1093

M.1098

a7ai9599

SB31

7,58 .0

7 fi7 .78 .2

1.75.85 .75.85.8

5.24.4

4.54.44.9

4.44.74 .64.8

4.S4.84.8

4,85.2

6.4

HI hi1

20

•)•>

2221

?120

222223

2222

212122

21212121

2\—2121

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M

n a t , 27/7/83.Promud a/s

.Technical Representative . MsKenzie/Sola/S0rb0. . District. North Sea. .Region. Norway.PAGE 2 OF 3

DRILLING MUD RECAP

Contractor

Rig No.. wrer

^OPERATOR._

Well Name_ And No

STATOILLEGAL

.DESCRIPTION.

7120/7-2 .Field _lBQMSeEL6KEE_ COUNTRY NORWAY

Promud a/sWarehouse. TAKBNGER _

Spud_Date_

No. Drilling26/5/83 Days To T.D..

DATE T.D. TOTALREACHED 21/7/83. D E P T H 2523 m.

TOTAL.COST S 162,510.17

DAIC

"'fir287729/7

30/731/7

1/82/8

3/8

4/85/8

fi/fl7/8

_8/89/8

m/R11/812/813/814/8

1V«16/817/818/8

19/8

24002400

2400240024002400240024002400

?4on240024002400

240024002400240024002400240024002400

2400

Bt fe'i

2523 1.20l2523

25232523

25232523252325232523

252325232523

25232523

2523252325232523

252325232523

2523

1.20

1 ?J1.201.201.201.201.201.20

i ?n1.201 . 2 01.2C

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474040

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1110

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111010

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3/193/19

3/185/16

4/123/82/9

3/82/9

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Cementing.Attempt to squeeze.

•i

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Run test string.Perforating.

Perforated. Ran bit&scrapeRun junk sub. Circ. Sat baMake up test equipment.""*"Started flowing.Flowing.Shut in well to build pres

•t n

Bullheading. Break down foTag packer - Run stinger.Plug and abandon program.

H If

•1 II

II II

H n

Date. 19/8/83.Promud a/s

.Technical Representative. North Sea. .Region. Norway. PAGE. -OF_

Petrofysical evaluation

In well 7120/7-2 the middle Jurassic sandstone was reached at

2149.5m RKB. The sandstone is hydrocarbon bearing with

relatively dry gas in an interval from 2149.5 to the gas-water

contact at 2228m RKB. The enclosed graphical reservoir log

covers the interval from 2145-2300 m RKB.

Input parameters for the log evaluation are given in the log

heading, and table 4 gives a summary of the results.

The log evaluation compares well with the core measurements.

RFT-summary

Four RFT-runs were performed 22 July 1983. The first run

resulted in 19 pretest pressure points out of 24 attempts, from

2150m to 2491m RKB, table 1. Ten of these 19 successful pretest

pressure points were in the hydrocarbon zone. Resistivity

logruns over the reservoir interval indicate a gas-water contact

somewhere between 2228 m and 2230 m RKB. Fig. 1 shows a gas

gradient of 0.214 g/cc and a water gradient of 1.052 g/cc,

computed from the RFT pretest pressure points. Linear regression

curve fit has been applied to establish both gradients. Using

the gas-and water gradients gives a gas-water contact at 2228 m

RKB.

Four samples were taken, one at each run. Sampling levels were:

Sample no. 1 at 2150.5m RKB. The 1 gallon chamber was opened on

the rig, containing 0.164 cubic m (5.8 cuft) gas and 1.8 liter

mudfiltrate with a film of condensate. Opening pressure was

137.9 barg (2000 psig). 2 3/4 gallon chamber failed.

Sample no. 2 at 2151 m RKB was a segregated sample. -The 2 3/4

gallon chamber contained 1.40 cubic m (49.6 cuft) gas, 3 liter of

mudfiltrate and condensate. The 1 gallon chamber had an opening

pressure of 158.6 barg (2300 psig) and was sent onshore of

laboratory analysis.

Sample no. 3 at 2225m RKB was a segregated sample. Both chambers

had an opening pressure of 0 barg and contained only

mudfiltrate/water. The 2 3/4 gallon chamber contained 10.5 liter

and the 1 gallon chamber 3.75 liter (no gas).

Sample no. 4 at 2220m RKB was a segregated sample. The 2 3/4

gallon chamber contaied 10.75 liter mudfiltrate/water and a minor

gas content. The 1 gallon chamber had an opening pressure of

89.6 barg (1300 psig) and was sent onshore for laboratory

analysis.

Table 1

RFT pressure points 7120/7-2

Depthm RKB

2150

2158

2170

2171

2178

2188

2200

2207

2215

2225

2230

2234

2240

2244

2250

2291

2420

2470

2491

2158

Pressurepsia

3502

3517

3512

3517

3517

3518

3524

3525

3528

3530

3538

3546

3548

3540

3563

3627

,3825

3894

3922

3514

kPa

24145

24249

24214

24248

24248

24255

24297

24304

24324

24339

24393

24449

24463

24407

24566

25007

26372

26848

27041

24228

g/cc

1.145

1.146

1.138

1.139

1.136

1.131

1.126

1.123

1.120

1.116

1.116

1.116*

1.114

1.109*

1.114

s1 . 1 1 3

1.112

1.109

1.107

1.145*

comments

* pretest pressure points not included in evaluation

Gas gradient linear fit: R2 = 0.848

Water gradient linear fit R2 - 1.00. .

'Table 3

Ion analysis of water samples from well 7120/7~2

Other properties

PH

Specific gravity 60/60 F

Resistivity, ohm meters

Resistivity, calc. from eq. NaCl

Suspended solids, mg/1

RFT(sample no.4) DST(separator sample)

:6.92 at 20 deg. C 6.35 at 20 deg. C

:1.022 1.012

:0.275 at 20 deg. C 0.560 at 20 deg. C

:0.270 0.478

:2542.94 1407.08

Cations

Sodium, Na (calc)

Calcium, Ca

Magnesium, Mg

Barium, Ba

Iron, Fe

Strontium

Potassium

mg/1

8900

272

34

1

11

5.1

214

mg/1

44 00

242

90

0.4

0.5

3.6

157

iAnions

Cloride, Cl :

Sulfate, SO4 :

Carbonate, C03

Bicarbonate, HCO3 .

Hydroxide

Total dissolved solids (calc)

.13963

4200

0

: 805

: 0

:28405

6213

1400

0

966

0

13473

7120/7-2 DST nr.1: 2153-2164.8 & 2168-2179.8 m RKB

Tab

FLOW PERIOD

Initial flow

Initial build-up

Main flow

Build-up

Gas gravity

Condensate gravity

C o2H 2 S

Bs & W

DURATIONMin

5.5

66

3000

2880

= .68

= .77

= 5%

= None

= 8%

WHPkPa

3342

-

6900

WgT

-29

BHPkPa *

21893

24160

22361

24127

BgT

78.

78.

84.

83.

*

2

8

9

3

GASRATESm 3 **

-

702450

CONDRATESm 3 ***

-

31.5

* Flopetrol SDP 83065

** Average

*** Measured

last 6 hrs

in tank

.

CHOKEInch

32/64

-

64/64• a .

CD

5

KJELLER HADDRESS N-2007 Kjeller, Norway NTELEPHONE (02)712560 - 713560TELEX 76361 energ n 7

REPORTTYPE

ALDEN-1751 Halden, Norway331 )831005335 energ n

REPORT NO.IFE/KR/F-84/008

REPORT TITLEREPORT ON STABLE ISOTOPES (5 C AND 5D) ONA NATURAL GAS FROM WELL 7120/7-2

CLIENTSTATOILDen norske stats oljeselskap a.s.

CLIENT REF.

SUMMARYThe gas components CH , C H C H . i"c,H1Q.

n"C/.H10 a n d

CO have been separated from natural gases of well 7120/7-2, and the 3 C-values of these components have beenmeasured. The isotopic composition of hydrogen whichwas made from the H O during the combustion of CH havealso been measured.

Both samples from well 7120/7-2 have been formed at a higlmaturity situation in the condensate field of the oilwindow. A source LOM of about 13 is indicatred for thegases. A high maturity source is also inferred from thecombined use of the 5 C methane value and the 6Dmethane value.

.., - - « -.f.(; •

* I •• i ! '

f •* * *•

AVAILABILITY

PrivateConfidential

DATE1984-01-17

DATE OF LAST REV.

REV. NO.

NUMBER OF PAGES

4

NUMBER OF ISSUES20

DISTRIBUTIONOppdragsgiver 10Andresen, B.Brevik, E.Garder, K.Gaudernack, B.Raheim, A.Berg, J.O.

KEYWORDS

NAME

PREPARED BY Bjflrg AndresenEinar BrevikArne Raheim

REVIEWED BY

APPROVED BY Karen Garder

DATE

1984-01-17

1984-01-17

SIGNATURE

REPORT ON STABLE ISOTOPES (513C AND 5D) ON NATURAL GASES FROMWELL 7120/7-2

ANALYTICAL PROCEDURE

The natural gas has been separated into the different gas componentsby a Carlo-Erba 4200 instrument. The hydrocarbon gas components wereoxydized in separate CuO-ovens, which enables us to collect severaltimes when the concentration of a gas component is low. Thecombustion products CO and H O were frozen into collection vesslesand separated. The isotopic measurements were performed on a FinniganMat 251 mass spectrometer. Our 8 C-value on NBS-22 is -29.77+/- .06 /oo.

RESULTS

The results are given in the following table :

Sampl

7120/RFT 2

e

71

-215 m

C H 4

5 1 3 C

- 4 0 . 8

5D

-122

C2HG

5 1 3 C

- 2 8 . 8

SHa5 1 3 C

- 2 8 . 2

5 1 3 C

- 2 6 . 4

4

513

-27

H 10

C

.5

C°25 1 3 C

- 1 0 .

7120/7-2 -41.1 -149 -26.8 -26.6 -25.0 -26.4 -15.1RFT 2219 m

13 0Our uncertainly on the 5 C-value is estimated to be +/- .3 /oo, andincludes all the different analyses steps.

The uncertainty on the 5D-value is about +/- 5 /oo. The isotopicmeasurement has been performed in Mook's laboratory, Groningen,Netherland.

INTERPRETATION

1 3THE 5 C-values of methane, ethane, propane and n-butane for the twosamples have been plotted on the maturity diagram by james (1983)*figure 1. A source LOM of about 13, eq. to a vitrinite reflectanceof about 1.6 is indicated. The 5 C-methane values plot above themethane line in the diagram. This is often the case for LOMs from12 to 14, the range of maturities where condensates are common.

The carbon and hydrogen isotopic composition of the two samples havebeen plotted in a 6 C methane vs. 50 methane cross plot. (Schoell,1983)** figure 2. This also indicate that the gases were formed athigh maturity in the condensate field of the oil window.

It is possible that the more negative 6 C CO value of the deepestsample (RFT 2219) suggests that this is closer to the source.

CONCLUSION

Both samples from well 7120/7-2 have been formed at a highmaturity situation in the condensate field of the oil window. A sourceLOM of about 13 is indicated for the gases. A high maturity source isalso inferred from the combined use of the 5 C methane value and the6 D methane value.

James, Alan T. (1983) : Correlation of Natural Gas by Use ofCarbon Isotopic Distribution 8etween Hydrocarbon Components,A.A.P.G. December, 1983

Schoell, M. 1983 : Genetic Characertization of Natural Gases.A.A.P.G. December, 1983.

8UVJIVI

1-; ., 12 14 16 18

COQ

o

OILWiii* » ,-m

CONDENSATE

METHANE HIGH-TEMPERATUREMETHANE

ETHANE

PROPANEn-BUTANE

n-PENTANE

n-C4

i-c4

CO-

2- 2 2+ 3 - 3 3+ 4-THERMAL ALTERATION INDEX

Figure 1. Carbon isotopic separations of the gases from well 7120/7-2 areplotted on the maturity diagram (after James, 1983). A source I£M of about13 is indicated for the gases.

Ttie calculated carbon isotopic separations between gas component are plotteton the vertical axis using a sliding scale that is simply the algebraic difference,in parts per mil, between the isotopic compositions of the natural gas components.The scale does not possess a fixed origin, but is oriented with the more depleted913C values at the upper end. Use of this sliding scale allows the maturity ofa gas to be assessed without prior knowledge of the isotopic composition of thegas1 source.

Institute forenergy technology

RF 2115

2 Vo l %

40.8

28.8

28.2

27.5

26.4

10.5

71.0

5.3

2.2

.5

.3

5.7

RF 22193C Vo l

41.1

26.8

26.6

26.4

25.0

15.1

72.0

4.2

1.5

.4

.3

1.0

Ixistituttforenergiteknikk

10— Cj.1%120 3 0 , 5 0 -300

B-250 -200 -150 -100

70 50

Figure 2 a. Variations of mole-cular composition in naturalgases related to the isotopevaritaitons of methane.

Figure 2b. Carbon and hydrogenisotope variations in methanes.

The principle for the genetic characterization of natural gases is thatthe primary gases (B-biogenic gas, T-associated gas, TT-non-associatedgas) are defined by fields of compositional variations. These primarygases may become mixed and form various mixtures "M" of intermediatecomposition. "TT (m) " and "TT (h) " are non associated gases from marinesource rocks and coal gases from N.W. Germany respectively, composi-tional shifts due to migration are indicated by arrows Md (deep migration)and Ms (shallow migration) respectively. "T " are gases associated withpetroleum in an initial phase of formation. °"T " are gases associated withcondensates. '(Schoell, 1983).