Drilling Operations of the first Iceland Deep Drilling Well (IDDP)

Transcription

1 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

2 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

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4 Saga Rig 0-87 m June 2008 Surface casing 36 hole to 87 m (26 bit and 36 under-reamer) 32 x 0,5 steel casing

5 Jötunn Rig m Nov-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

6 Týr Rig 796 m - final depth March-July ton hook load Topdrive Automatic pipehandling system 3 x Mudpumps 180 m 3 mudtanks

7 Broken Float Sub at 1194 m Standpipe pressure drops Torque drops

8 Broken Float Sub at 1194 m

9 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.

10 Fish #1 on surface Complete success of fishing with an Overshot

11 Broken 8 DC at 2074 m

12 Fish #2 on surface Managed to retrieve the fish to surface. The broken thread box

13 Stuck at 2101 m depth Pulled out three singles for reaming when hook load dropped suddenly of 20 tons Standpipe pressure drops Torque increases Drop in hook load No rotation

14 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

15 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

16 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

17 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.

18 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.

19 (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.

20 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 m). POOH for a cementing job from bottom to casing shoe. Fiberglass cementing pipes used with good results (easily drillable if stuck). Continued drilling.

21 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.

22 (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.

23 Stuck at 2103 m Continued drilling until the string got stuck at 2103 m. Managed to get loose by pulling 160 tons. Circulated for 1 ½ hour. RIH again slowly and when the bit was on bottom the torque increased and the string was stuck. Returns lost imediately and the string was blocked for circulation.

24 Pulled out Stuck at 2103 m (bit at 2090 m) Pill for sweeping Torque increases RIH slowly

25 Stuck at 2103 m (bit at 2090 m) The Hook load decreases by tons! String blocked for circ. Bit pushed up Pulled out Torque increases Torque increases RIH

26 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.

27 (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.

28 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.

29 Stuck in Magma at 2104 m The Hook load decreases by 50 tons! RIH Pulled out RIH Bit pushed off bottom Torque increases Torque increases Hook load decreases

30 Stuck in Magma! The circulation was maintained for 24 hrs. The string was loose.

31 Running casing and liner Decided to run 9 ⅝ production casing. Set it at the same depth as the Anchor casing 1957 m and cement it to surface. In the open hole section a 9 ⅝ slotted liner was set from 1957 to 2080 m.

32 Into magma 3 rd time Into magma 1 st time Into magma 2 nd time

33 Depth(m) Pre - Drilling of IDDP - 01 Days Actual Estimated

34 Depth(m) Broken Mud pump Drilling works I - IDDP - 01 Days IC IC Broken mud pump Actual Estimated

35 Depth(m) 0 Drilling works II - IDDP - 01 Days m Broken BHA AC Junk basket Drilled into magma 1st time Sidetrack I Coring Sidetrack II Running Anchor casing and cementing Drilled into magma 2nd time Drilled into magma 3rd time 2500 Bit change 2400 m Stuck at 2005 m 3000 PC Corings 3500 m PZ 4500 Actual 7 Corings 4500 m Estimated 5000

36 Thank you!

37 IDDP Consortium National Energy Authority Principal Science Investigators: Gudmundur Omar Fridleifsson, HS orka hf Wilfred A. Elders, University of California at Riverside

38 1600 m (18-24) CBL log 14 hrs after cementation

39 (18-24) Running and cement Anchor Casing

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