Project showcase

Well Design and Cost Optimization Study

Project goal

To reduce drilling costs and identify suitable well control measures for the purposes of assuring safety integrity amid a cost-conscious environment

Client:

Oil and Gas Operator

Asset:

Exploration well

Location:

Mediterranean Sea

The Request

Due to the criticality and unique complexity of the project goal and requirements, the operator required a specialist consultancy to:

  • Identify opportunities to reduce drilling costs
  • Develop a well control contingency plan for the exploration well
  • Determine safe, suitable, and cost-effective well control measures for the well


The Challenge

After a detailed analysis of the well design, it was identified that there could be significant challenges for regaining control of the well in the event of a blowout from the target reservoir.

Why

The reservoir targets were expected to contain dry gas with a significant flow potential

Options Available

  1. Reduce the flow potential and hence the kill requirements through reduction of the tubular sizes. This would however reduce production capacity and add significant costs to the project
  2. Determine suitable contingency measures for well control and improve contingency plan and toolkit

What we did

Option 2: A well control study was performed by Add Energy’s well control and blowout specialists, the results included:

  • Significant updates to the existing blowout contingency plan detailing the well control challenges of this well

  • Identification of suitable contingency measures

  • A bulletproof contingency toolkit for assuring efficient and effective well control of the “worst case” scenario blowout

  • Opportunities to reduce drilling costs

  • Identification of improved well design achieved by installing 9 5/8" casing above the top of the shallowest gas sand at a safe depth of 5000 meters

  • Access rights to the RWIS (the world’s only single relief well injection spool)

Project Benefits

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Well Control Assurance

A bulletproof contingency toolkit designed to assure efficient and effective well control of the “worst case” scenario blowout
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Cost Reduction

By securing access rights to the RWIS, the operator did not need to run additional casing strings, saving over $12M
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Drilling Target Achieved

Drilling targets were reached with the most desired bit size (8 ½")
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Emergency Response – On Demand

Access to the RWIS ensured the operator had sufficient well control measures, ready to call upon in the case of an emergency

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