Drilling Operations of the first Iceland

Deep Drilling Well (IDDP)

Sveinbjörn Hólmgeirsson

Project Manager Landsvirkjun Power

Ásgrímur Guðmundsson, Bjarni Pálsson, Kristinn Ingason, Hinrik Árni Bóasson, Sverrir Þórhallsson

What is IDDP?

IDDP is a long-term geothermal research program, established in year 2000

The goal is to improve the economics of geothermal energy by producing supercritical fluids from 4-5 km depth

National Energy Authority

Saga Rig 0-87 mJune 2008

• Surface casing

– 36” hole to 87 m (26” bit and 36” under-reamer)

– 32” x 0,5” steel casing

Jötunn Rig 87-260-796 mNov-Dec 2008

• Intermediate Casing 1

– 26 ½” Drillbit

– 24 ½” Casing 162 lb/ft, K55

• Intermediate Casing 2

– 23” Drillbit

– 18 ⅝” Casing 114 lb/ft, K55

Týr Rig 796 m - final depthMarch-July 2009

• 270 ton hook load

• Topdrive

• Automatic pipehandlingsystem

• 3 x Mudpumps

• 180 m3 mudtanks

2009-03-29

Broken Float Sub at 1194 m

Standpipe pressure drops

Torque drops

2009-03-29

Broken Float Sub at 1194 m

2009-03-29

Broken Float Sub at 1194 m

• Equipment downhole:

– 16 ½” Drillbit

– 9 ½” Mudmotor with 16 ⅜” sleeve stabilizer

– 16 ½” Stabilizer

– The other part of the Float Sub.

2009-03-31

Fish #1 on surface

• Complete success offishing with an Overshot

2009-04-18

Broken 8” DC at 2074 m

2009-04-19

Fish #2 on surface

• Managed to retrieve the fishto surface.

• The brokenthread box

2009-04-21

Stuck at 2101 m depth

• Pulled out three singles for reaming when hook load dropped suddenly of 20 tons

Drop in hook load

Standpipe pressure drops

Torque increases

No rotation

2009-04-29

Part of Fish #3 on surface

• Left in hole, 32 m of fish

• The fishing tool could not be relased

• Explosives to blast the string a part

2009-05-01

Fishing attempt

• RIH with a fishing assembly

• Connect to the box of the collar and tried to pull

• Unable to rotate or pull where the connection did not hold. Unable to reload the JAR because of the bad connection

2009-05-02

Cementing a Side Track plug #1

• 100 m cement plug planned to side track and drill pass the fish.

• Three attempts needed to get desired depth of TOC.

• Time drilling and sidetracking

• Success at 1934 m

2009-05-12

Stuck at 2005 m

• Decided to set the Anchor casing at 2005 m due to hazard zones higher up in the well (brittle formation because of cooling and heating).

• After having reached 2005 m and after 25 min. of circulation, the string got stuck.

• Circulation was maintained to clean the fill. The string was pulled and jarred for 3 days before it was loose.

2009-05-17

Wiper trip and circulate the fill of bottom

• Wiper trip before running the anchor casing.

• Bottom found at 1972 m (33 m fill).

• Tried to clean the fill with high viscous pills.

• Increased torque.

• Decided to POOH and deal with the fill after having cemented the Anchor casing.

2009-05-(18-24)

Run and cement Anchor Casing

• Run the 13 ⅝” and 13 ⅜” casing. Casing set at 1957 m (not to close to the fill).

• Cemented in two steps:

– Traditional inner string job, with a float collar and a float shoe up to known loss zones at 1600 m.

– Fill the annulus through the killline.

2009-05-27

Drilling for Production casing

• The well was drilled to 2016 m with a 12 ¼” bit.

• Total loss of circulation.

• Difficult cleaning because of a larger diameter hole below shoe (1957 m - 2005 m).

• POOH for a cementing job from bottom to casing shoe.

• Fiberglass cementing pipes used with good results (easily drillable if stuck).

• Continued drilling.

2009-06-02

Coring

• Decided to drill a spot core (9 m) from 2040 m.

• Known loss zones from previous track.

• Managed to drill 2 m until no penetration observed. No core inside the barrel.

2009-06-(04-07)

Junk basket and cement to shoe

• RIH with a Mill tooth bit and a Junk Basket trying to retrieve the rest of the core bit.

• Drill the well to 2060 m and cement possible junk in hole and clog the losses.

• Fiberglass drill pipes used for the cementing job.

• TOC found at 1970 m.

2009-06-08

Stuck at 2103 m

• Continued drilling until the string got stuck at2103 m.

• Managed to get loose by pulling 160 tons.

• Circulated for 1 ½” hour.

• RIH again slowly and when the bit was onbottom the torque increased and the string wasstuck.

• Returns lost imediately and the string wasblocked for circulation.

2009-06-08

Stuck at 2103 m (bit at 2090 m)

RIH slowly

Pill for sweeping

Torque increases

Pulled out

2009-06-08

Stuck at 2103 m (bit at 2090 m)

• The Hook load decreases by 10-15 tons!

RIH

Torque increases

Pulled out

Torque increases

Bit pushed up

String blocked for circ.

2009-06-10

Blind Back off

• A Blind Back off was carried out.

• A factory made up connection on the Anderdrift tool broke.

• Left in hole, 17 m of fish

• RIH with a fishing BHA without results.

2009-06-(15-22)

Cementing a Side Track plug #2 and side

track

• Cement a plug from top of fish at 2072 m and up to 1928 m (30 m inside the casing).

• Two attempts needed to get desired depth of TOC.

• Time drilling and side tracking.

• At 1985 m the bit was in formation.

• Continued drilling.

2009-06-24

Stuck in Magma!

• At 2100 m the bit was pulled up to casing and the well was cleaned. No fill was on bottom.

• At 2104 m the torque increased and the ROP doubled from 2 m/hr to 4 m/hr.

• The hook load decraesed by 40 tons.

• Managed to keep circulation and returns.

• Quenched glass in the returns.

• Proof of Magma.

2009-06-08

Stuck in Magma at 2104 m

• The Hook load decreases by 50 tons!

RIH

Torque increases

RIH

Hook load decreases

Bit pushed off bottom

Torque increases

Pulled out

2009-06-24

Stuck in Magma!

• The circulation was maintained for 24 hrs.

• The string was loose.

2009-06-29

Running casing and liner

• Decided to run 9 ⅝” production casing.

• Set it at the same depth as the Anchor casing1957 m and cement it to surface.

• In the open hole section a 9 ⅝” slotted liner wasset from 1957 to 2080 m.

Into magma 1st time Into magma 2nd time

Into magma 3rd time

0

10

20

30

40

50

60

70

80

90

100

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

De

pth

(m)

DaysPre - Drilling of IDDP - 01

Actual

Estimated

Broken Mud

pump

0

100

200

300

400

500

600

700

800

900

19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

De

pth

(m)

DaysDrilling works I - IDDP - 01

Actual

Estimated

IC - 1

IC - 2

Broken mud pump

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

61 71 81 91 101 111 121 131 141 151 161 171 181

De

pth

(m)

Days

Drilling works II - IDDP - 01

Actual

Estimated

AC

PC

PZ

800 m

2400 m

3500 m

4500 m

Sidetrack I Coring Sidetrack II

Bit change

2 Corings

7 Corings

Broken BHA

Junk basket

Drilled into magma 1st time

Drilled into magma 2nd time

Drilled into magma 3rd time

Stuck at 2005 m

Running Anchor casing and cementing

Thank you!

IDDP Consortium

National Energy Authority

Principal Science Investigators:

Gudmundur Omar Fridleifsson, HS orka hf

Wilfred A. Elders, University of California at Riverside

2009-05-(18-24)

CBL log 14 hrs after cementation

1600 m

2009-05-(18-24)

Running and cement Anchor Casing