Risk control in the well drilling phase: BOP system reliability assessment

Strand, Geir-Ove; Lundteigen, Mary Ann

doi:10.1201/b19094-101

Cited by 5 publications

(8 citation statements)

References 15 publications

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“…however, that is a contingency as it requires time to deploy the ROV. The standard procedure entitles the driller to use the BOP control panel and/or the emergency shut-down system (ESD) (Strand & Lundteigen, 2015).…”

Section: Blowout Preventer Systemsmentioning

confidence: 99%

“…A Technical review detailed by Strand & Lundteigen (2015), identified seven distinct BOP well isolation (close-in) scenarios that vary in accordance with the drilling stage, drilling technique and the arrangement of: drill string position and spacing, pressure, well geometry, and kick tolerance/fracture gradient. Kick tolerance is the maximum amount of influx of certain density that would cause the weakest formation interval to fracture.…”

Section: Blowout Preventer Systemsmentioning

confidence: 99%

“…Kick tolerance is the maximum amount of influx of certain density that would cause the weakest formation interval to fracture. The characteristics of the BOP that impact its reliability aspects, such as being a system activated under demand and testable overtime, are investigated by several studies (Cai, Liu, Liu, Tian, Dong, et al, 2012;Cai, Liu, Liu, Tian, Zhang, et al, 2012;Strand & Lundteigen, 2015) and will not be detailed in this paper. The important characteristic of the BOP system that should be highlighted for the purposes of this paper is that such system change from rig to rig and are also a function of the well design.…”

Section: Blowout Preventer Systemsmentioning

confidence: 99%

“…The BOP control system (E16), a safety critical part of the BOP system, was chosen as an example of a safety barrier system. For the sake of simplicity, the BOP control system was simplified into the following major critical elements (Strand & Lundteigen, 2015):  Main control system composed of two redundant BOP control panels;…”

Section: Blowout Risk Model Customization (Level 2 and 3)mentioning

confidence: 99%

“…up of three main subsystems to achieve this function (Deepwater Horizon Study Group, 2011)(Strand & Lundteigen, 2015):  The control system that distributes hydraulic power fluid from the hydraulic power unit and accumulator banks used for activation of the BOP closure elements. Modern control systems are based on two principles; electro-hydraulic ('multiplex') or pilot hydraulic ('all hydraulic').…”

mentioning

confidence: 99%

See 4 more Smart Citations

Offshore drilling blowout risk model – an integration of basic causes, safety barriers, risk influencing factors and operational performance indicators

Perez

Dalu

Gómez

et al. 2018

Safety and Reliability

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Offshore drilling is an activity inherent to the oil and gas industry as it is essential for confirming the economic feasibility of hydrocarbon reservoirs. However, operational uncertainties and risks inherent to typical major accident hazards are associated with the performance of this activity, where blowouts are assumed to be one of the major contributors to risk in offshore drilling. This paper presents an accident precursor risk model for offshore drilling blowouts that integrates the blowout basic causes, safety critical barriers & elements, Risk Influencing Factors (RIF) including Human and Organizational Factors (HOF), and Operational Performance Indicators (OPI). The method, which was adopted to design the model and allow its customization for reflecting the characteristics of any drilling rig, well and operation is also described and demonstrated using a theoretical example. The model is hybrid, as it combines bow-tie diagram (fault tree and event tree) with directed acyclic graphs (DAG), to account for the effect of the RIF on the performance of safety barriers through the direct observation of pre-defined OPI.

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Section: Blowout Preventer Systemsmentioning

confidence: 99%

Section: Blowout Preventer Systemsmentioning

confidence: 99%

Section: Blowout Preventer Systemsmentioning

confidence: 99%

Section: Blowout Risk Model Customization (Level 2 and 3)mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Offshore drilling blowout risk model – an integration of basic causes, safety barriers, risk influencing factors and operational performance indicators

Perez

Dalu

Gómez

et al. 2018

Safety and Reliability

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show abstract

Performance analysis for subsea blind shear ram preventers subject to testing strategies

Zhang

Barros

et al. 2018

Reliability Engineering & System Safety

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In a subsea blowout preventer system, a subsea blind shear ram preventer (BSRP) plays as a crucial safety barrier by cutting off the drill pipe and sealing the wellhead to prevent serious accident. Testing and repairs of BSRPs are the main issues in operation and maintenance activities. It is important to assess unavailability during proof and partial testing phases in order to ensure their safety functions. This paper presents a newly state-based approach for unavailability analysis by incorporating testing activities of BSRPs into multiphase Markov process.In the approach, states waiting for repair are taken into consideration. Analytical formulas for evaluation of time-dependent unavailability and average unavailability for BSRPs are developed. In addition, the non-periodic characteristics and effects of degradation are also taken into account in proof testing. The effects of testing errors and postponed repairs on the tendency of unavailability in partial testing phases are checked in the proposed models.Performance analyses for BSRP configurations, scenarios and cases considered in the paper are carried out to demonstrate the application of the proposed models. Monte Carlo models for both proof and partial testing are developed and simulated. Different comparisons are performed for validation of the set of the derived formulations.

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Modelling framework for performance analysis of SIS subject to degradation due to proof tests

Srivastav

Barros

Lundteigen

2020

Reliability Engineering & System Safety

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Risk control in the well drilling phase: BOP system reliability assessment

Cited by 5 publications

References 15 publications

Offshore drilling blowout risk model – an integration of basic causes, safety barriers, risk influencing factors and operational performance indicators

Offshore drilling blowout risk model – an integration of basic causes, safety barriers, risk influencing factors and operational performance indicators

Performance analysis for subsea blind shear ram preventers subject to testing strategies

Modelling framework for performance analysis of SIS subject to degradation due to proof tests

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