Daily depth report of USDP-4 drilling (2003)

Tohoku Geothermal Energy Co. Ltd.

Apr. 5

Apr. 6

Apr. 7

Apr. 8-9

Depth of previous day

261.3

261.3

264

246.5

Drilled depth (m)

262.4 (12-1/4")

264.0

246.5

260.4

-

Wgt On Bit/table rev (t/rpm)

3-5/45 (HOP)

-

Hole diameter (inch)

20

20

20

20

Mud s.g./viscosity

Aerated

In/Out mud temp (C)

Mud loss (kl/h)

10

Remarks

Cleaning, measurement, 82m 0Ž¡50'-S

Cleaning, measurement reaming, drilling cleaning, measurement
110m 1Ž¡50'-S1Ž¡W, 137m 4Ž¡30'-S1Ž¡W, 165m 7Ž¡-S, 193m 10Ž¡10'-S4Ž¡W

Casing (18-5/8") in-out, assemble of reaming BHA
221m 12Ž¡15'-S, 239m 13Ž¡30'-S3Ž¡E

Reaming, cleaning, preparation of for 22"casing shoe mill

Mar. 20

Mar. 21

Mar. 22

Mar. 23

Mar. 24

Mar. 25-Apr.4

Apr. 4

Depth of previous day

209.6

214.0

228.0

246.5

260.4 (12-1/4")

260.4 (12-1/4")

256.4 (20")

Drilled depth (m)

214.0

228.0

246.5

260.4

-

55.3-256.4 (20")

261.3 (20")

Wgt On Bit/table rev (t/rpm)

2/DHM

1.5-3/DHM

2-3/DHM

3/DHM

-

3-5/35-45 (HOP)

1-5/45 (HOP)

Hole diameter (inch)

12-1/4

12-1/4

12-1/4

12-1/4

12-1/4

20

20

Mud s.g./viscosity

water

water

water

water

water

water to aerated (1.0-1.02)/27-32

Aerated

In/Out mud temp (C)

17-35/17-35

Mud loss (kl/h)

>77

>77

>77

>77

0 to 20

6-40

Remarks

Drilling, cleaning, measurement

Cleaning, drilling, cleaning.

Cleaning, measurement, drilling, cleaning

Cleaning. orienting, drilling, cleaning, orienting, drilling

Cleaning, cementing (supergel), cleaning

Widening, cleaning
130m-3Ž¡50', 179m-8Ž¡

Reaming (141.2-256.5m), widening (256.5-261.3), cleaning,

Mar. 8

Mar. 9

Mar. 10

Mar. 11

Mar. 12

Mar. 13

Mar. 14-19

Depth of previous day

159.5

159.2

163.2

189.6

196.0

202.0

209.6

Drilled depth (m)

89.5-114.4

163.2

189.6

196.0

202.0

209.6

109.1-160.5

Wgt On Bit/table rev (t/rpm)

1/DHM

1.5-2/DHM

1.5-2/DHM

1-1.5/DHM

10/40

1-2/DHM

1-2/DHM to 10/40

Hole diameter (inch)

12-1/4

12-1/4

12-1/4

12-1/4

12-1/4

12-1/4

12-1/4

Mud s.g./viscosity

1.02/34

water

water

water

water

1.03/35-water

In/Out mud temp (C)

18/19

Mud loss (kl/h)

zero

2->92

>70

>92

>90 to >154

>77

0 to >154

Remarks

Reaming

Cleaning,
reaming.

Reaming

S26W-1Ž¡10' (85m), S28W-3Ž¡20' (113m), S20W-5Ž¡10' (141m), S16W-8Ž¡(178m)

Cementing, hole cleaning

Cementing, reaming

Feb. 24

Feb. 25

Feb. 26

Feb. 27

Feb. 28

Mar. 4

Mar. 5

Depth of previous day

70.3

72.7

80.0

80

114.0

136.0

144.5

Drilled depth (m)

72.7

80.0

-

114.0

136.0

144.5

159.5

Wgt On Bit/table rev (t/rpm)

1.5/50

2/50

3/DHM

3/DHM

3/DHM

4/50

4-5/45

Hole diameter (inch)

12-1/4

12-1/4

12-1/4

12-1/4

12-1/4

12-1/4

12-1/4

Mud s.g./viscosity

1.04/41

water

water

In/Out mud temp (C)

16/17

19/20

Mud loss (kl/h)

17 to total loss

15-40 to 6-11

0 to 5

0 to 8

0 to total (<92)

total to 14

8 to >154

Remarks

Hole cleaning,
cementing
reaming

Cementing,
depth of kick-off point.

Cementing,
reaming,
hole cleaning

Hole cleaning,
orianting

Hole cleaning

Cementing, reaming, hole cleaning

S10W-3Ž¡20' (112m), S17W-2Ž¡50' (139m)
Cleaning, cementing

Jan. 15

Jan. 16

Jan. 17

Jan. 19

Feb. 18

Feb. 19

Feb. 20

Depthof previous day

0

19.0

27.8

51.0

51.0

51.0

68.2

Drilled depth (m)

19.0

27.8

51.0

-

-

68.2

70.3

Wgt On Bit /table rev (t/rpm)

Air hammer

Air hammer

Air hammer

Rotary operation starts

1-1.5/45

1/45

Hole diameter (inch)

(680mm)

(680mm)

(680mm)

(580mm) casing 22 (560mm)

(580mm) casing 22 (560mm)

12-1/4

12-1/4

Mud s.g./viscosity

1.02/

In/Out mud temp (C)

10/16

Mud loss (kl/h)

0.28

0

5 to >230

Remarks

24 hr-work began.

*Preparation of rig site and water supply system from Jan. 20 to Feb. 17.

*Air-hammer drilling work starts on January 10, 2003.

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