drilling the tune field with potassium formate brine
DESCRIPTION
Presentation given by Norsk Hydro and M-I at IQPC conference in June 2003. Describes the use of potassium formate brines as the reservoir drilling and completion fluids in four wells in the Tune field development, offshore Norway.TRANSCRIPT
Tune Case (NH)Experience from Drilling and Completion using formate based fluids
Tune Case (NH)Experience from Drilling and Completion using formate based fluids
Drilling & Completion Fluid Seminar, Aberdeen 03.06.24By Atle Nottveit, Manager Well Completion
Drilling & Completion Fluid Seminar, Aberdeen 03.06.24By Atle Nottveit, Manager Well Completion
Agenda – 03.06.24
Tune Field Information
Mud and completion fluids criteria
Fluids alternative
Drilling and completion experience
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Tune Field data Location
Block 30/8 ca. 130 km northwest of Bergen 10km west of Oseberg Field Centre
Fluids Gas/ condensate @ 525 bar, 131 oC
Production strategy Pure gas depletion
Reserves Gas
– 22.9 GSm3 Phase1 – (27.1 GSm3 incl. Phase 2 &3)
Condensate: – 5.8 MSm3 Phase 1
– (7.0 MSm3 incl. Phase 2&3)
Producers: 4 ( +1+1 Phase 2&3) Sub sea template, tie-in Oseberg Field
Centre 2 x 11 km 11.5” Carbon pipelines
Oseberg
Tune
Oseberg Sør
Brage
Field Centre/ OSA/OSB/OSD
OSC
Oseberg Øst
Tune Field data
Fluids criteria
Drillability MW = 1.65sg
Open hole completion Minimum formation damage Avoid plugging of sand screens Fluid loss control, while running sand screen
Same type of fluid both for drilling and completion Limitation of pit capacity at rigsite
(Deep Sea Delta)
Fluid alternativesAlternative #1
OBM as drilling fluid and run sand screen in same.
Alternative #2 OBM as drilling fluid. Run screen through OBM with
LSOBM (Low solids oil based mud) in open hole.
Alternative #3 Formpro (Potassium formate) RDIF as drilling fluid and
run screen in same.
Alternative #4 Formpro (Potassium/Cesium formate) RDIF as drilling
fluid and run screen in same.
Fluid alternatives
Alternative #3 chosen, but during drilling, well clean up was delayed from 2-3 weeks until 1 year. Well A 14 an A 11 was therefore completed in
Potassium/Cesium Formate based Formpro. Well A 12 AH displaced to Potassium/Cesium
formate based Formpro in reservoir section after 7 months.
A 13 only well left with Potassium Formate based Formpro.
Typical drilling fluid parameters
MW: 1.65 sg
PV: 21 - 30 cP
3rpm: 3 - 5 lbs/100 sq. ft.
HTHP: 9 - 11 mls
LGS: 320 – 420 (including CaCO3)
Drilling and completion experiences
Excellent hole cleaning
Lower friction than other WBM system
Stable wellbore
Aeration in fluid
Drilling experience
Drilling experience
DrillingDrilling Down TimeCompletionCompl. Down time