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Integrated risk management: a Petrobras application in offshore well construction safety to minimize critical emergency disconnections

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Petroleum Science 2018年第2期15卷 421-431页

作者： Claudio Benevenuto de Campos Lima Pedro Esteves Aranha Jose Francisco Tebaldi de Castro Gilson Brito Alves Lima Augusto Borella Hougaz Felipe de Souza Terra Petrobras Department of Production Engineering Federal Fluminense University

In order to avoid mistakes and to save a great deal of time in analysis, an innovative methodology was developed that can analyze the well operations and rig characteristics involved to define the best emergency disconnect sequence （EDS） available. A solution was developed based on the characteristics of the rigs and blowout preventers （BOPs）, and six variables were considered that directly affect the choice of EDS. All possible combinations of 64 scenarios were analyzed, and the priority of choice of the EDS was defined empirically. This paper presents an approach to EDS risk management and examples of exposure time （time without riser safety margin and shear capability） for the same well, which can be lowered from 13% to 0.1%. The impact of this reduction is related to the ability of the BOP to cut some of the heavy casings, in addition to improved availability of EDS modes. This implementation opened up many possibilities for the performance of risk exposure analysis, enabling comparison of several BOP configurations of contracted rigs and selection of the best options. This innovative approach allowed a better management of the rig schedules, prioritizing safety aspects and making it possible to allocate the fleet in a systematic way.

关键词： well safety Safety barriers Emergency disconnect sequence (EDS) well control Kick well design

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Use of graphs to assess well safety in drilling projects and during operations by identification of available barrier elements and consolidation of barrier envelopes

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Petroleum Research 2024年第3期9卷 418-431页

作者： Nelson Choueri Jr Marcelo Anunciacao Jaculli Amanda Gabriela Aparecida Silva Leite JoséRicardo Pelaquim Mendes University of Campinas Brazil

Two independent barrier envelopes are the usual requirement used in most well operations to avoid catastrophic *** are classified as primary-concerning preventing the occurrence of a kick,and secondary-concerning controlling the kick to avoid a *** envelopes consist of barrier elements,thus verifying the quality of these elements is *** elements may be either redundant or mandatory,and these relationships are what constitute the barrier *** this work,we present a methodology to evaluate well safety by identifying existing barrier elements and barrier envelopes and mapping their relationships through the usage of graphs *** technique explicitly states the relationship between barriers and between them and *** enables a simpler visualization for well designers and allows the development of computer programs to control the safety and integrity of wells,both in the design phase and during drilling.12 graphs are provided for a 4-phase well(conductor,surface,production,and drill-in),considering both the primary and secondary *** for constructing each graph is thoroughly *** these graphs are used,reliability values can then be assigned to each barrier element,which results in the reliability of entire barrier *** can be further extended to analyze the safety of each operation by applying the system to operational sequences and even comparing well designs.

关键词： Barrier elements Barrier envelopes well design well safety Graphs technique

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