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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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Reliability of permanent downhole systems:Minimum sample and quality index

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Petroleum Research 2024年第3期9卷 472-480页

作者： Maria Juliana Martins de Souza Antonio Heverton Martins Silva JoséRicardo Pelaquim Mendes marcelo anunciacao jaculli UNICAMP ENERGIACAMPINASSPBrazil PETROBRAS SUB/EQSB/IESUB/STIESMACAERJBrazil

Permanent downhole monitoring systems are responsible for measuring pressure and temperature time series and enable uninterrupted reservoir characterization during the oil field production period,playing a key role in the oil and gas *** in hostile pressure and temperature environments(i)close to the reservoir,in the case of the PDG(Permanent Downhole Gauge)sensor,and(ii)at the wellhead,in the case of the TPT(Pressure and Temperature Transducer)and PT(Pressure Transducer),its data are transmitted from the subsea environment to the Floating Production Storage and Offloading(FPSO),where the Master Control System(MCS)provides the information in engineering *** infor-mation fulfills its function in the FPSO plant and finally is stored in an onshore data *** complexity,importance,and maintenance difficulty of this system make it necessary to control and manage its ***,the objective of this work is to increase the availability and maximize the useful life of the downhole permanent monitoring system through the reliability calculation,using the Weibull estimate with 2 parameters,and the application of an index quality of statistical *** proposed method for estimating reliability uses a database containing information from permanent downhole monitoring systems of the PDG,TPT,and PT type,from January 1st,2008 to January 9th,2014,and considers only the failures that occur until the arrival of the data in the *** the reliability results,it can be observed that stratifications of this database could generate samples with a smaller number of observations,thus inferring reliability even with a small number of *** deepening of this method results in the definition of the minimum sample that allows removing reliability inferences without statistical significance and a quality index that allows classifying the reliability estimates of stratified sets of the largest sample of a *** is worth mentioning h

关键词： Reliability Permanentdownhole system Index quality MinimumSample PDG

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