Risk-based well decommissioning Software

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1 Deploy

Systematically and comparatively evaluating risks for innovative well barrier design

Page last modified
April 11 2024

Astrimar has established track record supporting operator well decommissioning design decisions and ALARP (as low as reasonably practicable) risk demonstration. Many wells to be decommissioned will have challenges requiring innovative designs that deviate from those specified in industry (e.g. OGUK or NORSOK) guidelines or require application of new plugging technologies. For these wells, a quantified or semi-quantified risk assessment is fundamental to demonstrating acceptable risk management and ALARP. Astrimar’s STEM-flow software supports prediction of barrier system failure over time.

Pros & Limitations
Enables alternate well decommissioning designs and solutions
Optimises use of data to predict barrier performance
Helps understand impact of uncertainty over time
Supports identification of cost effective solutions while maintaining acceptable risk
Enables risk assessment process suited to demonstrating ALARP
Supports assessment of impact of non-ideal and novel conditions through analysis of barrier system failure mechanisms
The simplified failure mechanism models assume homogeneity of barriers and interfaces (however, simulations estimate expected performance over a range of possible input criteria)
Models require initial identification of barrier failure modes and mechanisms (Typically supported by a FMECA analysis)
Specification Title Specification Description
Assessment of multiple designs, optimising for cost, safety, compliance and risk
Assessment of alternative well barrier materials, including novel plugging technologies, and impact of technology uncertainty
Assesses cost-benefit from a risk-managed perspective to support cost reduction through comparative assessment
Ability to assess multiple abandonment designs and associated risk, to enable non-standard innovative P&A solutions
Supports operators in demonstrating compliance in adopting risk-based well P&A
Supports risk-based qualification of novel P&A technologies and their acceptance for deployment


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Astrimar is an independent specialist engineering consultancy delivering excellence in engineered solutions and reliability assurance.

  • Reliability, Integrity & Technical Risk Management
  • Innovative Engineering Design & Advanced Analysis
  • Technology Qualification

Our highly trained team are experts in developing innovative solutions through advanced approaches to Engineering design & analysis, Reliability & Data analysis, Technical risk, Integrity management, and Technology qualification in subsea oil & gas, and wider energy & utilities sectors.

Our clients include innovators developing new energy transition technologies, as well as long-standing subsea clients, operators, equipment manufacturers and technology developers.

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