Minimum path partitioning—An illustration of the Monge property

The hardware reliability of a gas monitoring system was investigated using the fuzzy fault tree analysis method. A fault tree was developed considering the hardware failure of the gas monitoring system as a top event. Two minimum path sets were achieved through qualitative analysis using the ascending method. The concept of fuzzy number of the fuzzy set theory was applied to describe the probability of basic event occurrence in the fault tree, and the fuzzy failure probabilities of the middle and top events were calculated using fuzzy AND and OR operators. The results show that the proposed fuzzy fault tree is an effective method of reliability analysis for gas monitoring systems. Results of calculations using this method are more reasonable than those obtained with the conventional fault tree method.

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Well Integrity Analysis and Application Based on FTA Method

Research in Economics and Management ◽

10.22158/rem.v2n1p20 ◽

2016 ◽

Vol 2 (1) ◽

pp. 20

Author(s):

Lili Yan

Keyword(s):

Risk Factors ◽

Oil And Gas ◽

Gas Production ◽

Control Measures ◽

Analysis Model ◽

Oil And Gas Production ◽

Wellbore Integrity ◽

Minimum Path ◽

Failure Risk ◽

Production Run

With the increase of development the well integcrity problem are becoming more and more serious. This article uses the Fault Tree Analysis (FTA) method for many factors, such as completion, production and operation process, pressure annulus, the cementing quality, the wellhead system and leakage of pipe string. Many wellbore risk factors to conduct a comprehensive analysis and evaluation. Through the qualitative analysis of wellbore integrity failure risk, determining the level of risk factors and establishing the damage analysis model of the wellbore. According to the selected blocks in Shengli Oilfield example analysis of single wells find out the minimum cut sets, the minimum path sets and structure importance. The results showed that the selected block probability of top event is calculated and it’s 0.9961, and the actual selection conforms to statistics prove that the proposed based on the FTA wellbore damage risk analysis method is feasible, and through quantitative analysis and calculation of basic events of different important degree of parameters.According to these risk factors for prevention of failure risk control measures are put forward, which provides reference for predict wellbore integrity to ensure the safety of oil and gas production run smoothly.

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