Neptune Energy made a discovery in Norwegian sea. Here is how a complex exploration wells can be planned using Pro Well Plan.

Recently Neptune Energy drilled a well 6407/8-8 S Calypso in Norwegian sea. The well has been drilled using the Deepsea Yantai semi-submersible rig upto depth of 3496 meters in Garn formation, a sandstone reservoir in middle and lower Jurassic formation.

6407/8-8 S Calypso is located at ED-50 co-ordinates of 64° 24'36.9952" N and 7° 31'21.1425" E. The Calypso prospect is located 14 km north-west of the Draugen field and 22 km north-east of the Njord A platform, within the Neptune-operated PL938 License.

Posted 19.12.2022 09:00 by Muhammad Suleman
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An overview of hole sections are described shortly here.

9-7/8" Pilot Hole

9-7/8” pilot hole was drilled from seabed at 298.3 meters up to 1045 meters from RKB using 1.03 sg sea water as drilling fluid.

42"x36” Section

42"x36" hole was drilled using sea water and 36"x30" conductor casing was set at 373 meters.

26” Section

26" section was drilled upto depth of 1045 meters with sea water as drilling fluid. According to offset data available with Pro Well Plan through NPD, the formation drilled in this section might be Naust formation in Nordland Group. 20" casing (N-80, 133 lb/ft) was run upto section bottom and cemented with top of cement almost 150 meters above shoe.

17-1/2” Section (Contingent Section)

A contingent 17-1/2” section was planned to be drilled from seabed up to 1,950 meters using maximum 1.4 sg oil base mud. 13-3/8" casing was planned to be run if required.

12-1/4” Section

12-1/4” section was planned to top of reservoir at section TD of 2855 meters using 1.6 sg oil base mud. 9-5/8" casing (P-110, 53.5 ppf) was planned to run upto section depth with top of cement 400 meters above shoe.

8-1/2” Section

The main bore was planned to complete in 8-1/2” open hole upto depth of 3501 meters in Garn Formation, using 1.4 sg oil base mud. A contingent 7" liner was also planned with further drilling of 6" hole as contingent in case of failure to reach target with previous casing.


Two sidetracks were planned for data gathering. First one was planned at around 1050 meters in 20" casing or 13-3/8" casing. Before this sidetrack, 9-5/8" casing were to cut and removed. Then 12-1/4" section planned to drill down to depth of 2849 meters using oil base mud. 9-5/8" casing was planned to run and cemented with top of cement 400 meters above shoe. 8-1/2" open hole was planned down to depth of 3485 meters using oil base mud.

Full Page Schematic

Pro Well Plan is comprehensive software which can be used to plan such exploration wellbores with easy access to range of offset data integrated in it.

Visual Comparison of geology, section depths, casing properties can easily be performed using explorer panel in PWP. Moreover, all this data can be imported to current well with a single click and adjusted to new parameters.

See recording below to see how offset analysis for an exploration well can be done efficiently using data from several sources, all at one place, that is Pro Well Plan.

A design for 6407/8-8 S is created in Pro Well Plan using its coordinates. Its location on map gives all the relevant data of nearby wellbores. Each dot on Map represents a wellbore and it is super easy to visualize and compare data of these nearby wellbores.

Casing Data

Casing data along with hole sizes, mud weights and geological formations can easily be compared under Pro Well Plan Comparison Tab. Access to such data in with a single click gives immense power to drilling engineers to make decisions with full confidence.

Well Paths Data

Well Paths of nearby wellbores gives very important information about extent and depth of nearby wellbores. This feature is under further development where anti-collision feature will be introduced to ease the planning of well path for an exploration well. An immense opportunity will be created here to tap the unexplored areas with mitigating risk using data from sources.

Pressures Data

Pressures data includes pore pressures, fracture pressures and mud weights. For an exploration wells, such data is always uncertain. Using Pro Well Plan, drilling engineers can have look at hundreds of nearby wellbores with their pressures data available to compare with a single click.

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