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