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10366 Estimation of the Replacement Time Interval Due to CO2 Corrosion in Oilwells by Random Process Modelling

Picture for 10366 Estimation of the Replacement Time Interval Due to CO2 Corrosion in Oilwells by Random Process
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Product Number: 51300-10366-SG
ISBN: 10366 2010 CP
Author: Raymundo Case, PhD
Publication Date: 2010
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$20.00
$20.00
The predictive assessment of the optimum replacement time due to the corrosion damage accumulation allows the control of associated operating expenditures in oilfield operations. To such purpose a model was developed for the assessment of CO2 corrosion related damage accumulation.

The model proposed is based on the calculation of the CO2 corrosion damage accumulation and failure probability as a sequence of random processes. The distribution of failure likelihood is then assessed in terms of a Markov random process from both an Ergodic, or repair, and an Absorbent, or unhindered damage accumulation, scenarios.

The value of the optimum replacement time estimated by the model proposed was compared with an actual documented case from a mature oilfield development. The modelled results indicate that the mean transition time for failure without mitigation is around 6 years which coincide with the observed behaviour from the field. The modelled optimum replacement time interval for this case was estimated as 5 years of service time.

Keywords: CO2 corrosion, stochastical models, localized corrosion failure, reliability prediction
The predictive assessment of the optimum replacement time due to the corrosion damage accumulation allows the control of associated operating expenditures in oilfield operations. To such purpose a model was developed for the assessment of CO2 corrosion related damage accumulation.

The model proposed is based on the calculation of the CO2 corrosion damage accumulation and failure probability as a sequence of random processes. The distribution of failure likelihood is then assessed in terms of a Markov random process from both an Ergodic, or repair, and an Absorbent, or unhindered damage accumulation, scenarios.

The value of the optimum replacement time estimated by the model proposed was compared with an actual documented case from a mature oilfield development. The modelled results indicate that the mean transition time for failure without mitigation is around 6 years which coincide with the observed behaviour from the field. The modelled optimum replacement time interval for this case was estimated as 5 years of service time.

Keywords: CO2 corrosion, stochastical models, localized corrosion failure, reliability prediction
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