Conductor Analysis


Documents wellhead system integrity. 4Subsea’s conductor analysis documents that the conductor can maintain required integrity during the entire lifespan of the well. By tailoring the analysis to the specific rig choice, well location and design, we reduce cost by maximizing the operational window and avoid oversized equipment.

4Subsea conductor analysis

 

Typical Challenges for Operators

 

Do any of these apply to your drilling operations?
  • It’s difficult to understand requirements related to static and dynamic wellhead loads
  • You lack documentation of conductor integrity for the planned operation
  • You struggle with limited operational windows during drilling
  • You want to avoid installing an oversized conductor
  • You are experiencing poor service life of your wellhead system

 

The conductor is the main load bearing component in a satellite well, typically drilled for exploration or appraisal purposes. In order to have control of the well, it is crucial that the conductor retains its integrity at all times. Primarily during the entire drilling campaign, but also in the case of an accident, such as loss of position or if a capping stack needs to be installed.

 

By presenting the main results on our digital platform in addition to the traditional report, the consequence of installation tolerances, design choices or length of operations are visualized in a clear and understandable way. This enables you to select results based on actual well stick-up and inclination after installation, and to understand how it affects operation limits and service life.

 

The conductor behaviour is dependent on a range of parameters. Waves and vessel motions govern the loads applied to the well; the well resistance is dominated by soil support and the strength of the well components. Our conductor analysis efficiently takes care of both the load and the resistance side, and investigates uncertainties in input when relevant.

 

4Subsea conductor analysis desktop view
4Subsea conductor analysis graph

 

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Key Benefits

  • Ensures compliance with regulatory requirements and NORSOK (On the NCS: “Innretningsforskriften”)
  • Highlights potential issues early and limits costly late minute design changes
  • Provides concrete advice on possible changes in well design/operation procedures as mitigating actions
  • Gives easy access to results, presented as interactive plots in a web solution

 

Key Features

  • Assesses the wells ability to withstand both extreme loads and fatigue loading, such as:
    • Axial bearing capacity assessment: optimisation of required number of conductor joints
    • Structural capacity evaluation: verifies ability to withstand static and dynamic riser loads
    • Soil capacity evaluation with respect to loads imposed by conductor
  • Conclusive assessments with recommendations on how to meet requirements, reviewed against operating guidelines.
  • Interpretation of geotechnical reports and site surveys through partnership with Norwegian Geotechnical Institute (NGI)

 

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