Elektronička sonda za nerazorno ispitivanje cijevi naftne bušotine primjenom impulsnih vrtložnih struja

scientific master's theses

• Title (english): Pulsed eddy current based electronic tool for nondestructive inspection of oil-well casing
• Author: Davorin Ambruš
• Mentor: Vedran Bilas (mentor)
• Committee member: Ratko Magjarević (predsjednik povjerenstva)
• Committee member: Vedran Bilas (član povjerenstva)
• Committee member: Igor Zorić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Electronic Systems and Information Processing); Zagreb
• Defense date and country: 2005-12-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Electronics
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U radu je prezentirana metodologija projektiranja i izvedbe elektroničke sonde za nerazorno ispitivanje zaštitne cijevi naftne bušotine. Ispitivanje je temeljeno na metodi impulsnih vrtložnih struja, a uključuje određivanje osnovnih mehaničkih značajki cijevi (debljine stijenke i unutarnjeg promjera).
Na početku su definirani osnovni tehnički zahtjevi vezani za potrebne mjerne karakteristike sonde, te uvjete rada u visokotemperaturnom okruženju. U skladu s traženim zahtjevima, sustavno je obrađena problematika izbora optimalnih elektroničkih komponenata i sklopova za rad na visokim temperaturama, te načina njihovog povezivanja i ugradnje. Opisani su osnovni fizikalni mehanizmi kvarova, te praktične metode za ostvarenje potrebne funkcionalnosti i pouzdanosti sonde na temperaturama do 175 °C. Analizirana je mjerna metoda temeljena na impulsnim vrtložnim strujama, te su pokazane njezine osnovne prednosti u odnosu na ostale primjenjive metode. Pri tome je posebna pažnja posvećena prednostima metode s instrumentacijskog aspekta (manja potrošnja, manja duljina sonde, kraće vrijeme ispitivanja, jednostavnija sklopovska izvedba). Na temelju provedenih razmatranja mjerne metode i problema ekstremnih radnih uvjeta, predložena je i opisana sklopovska i programska konfiguracija elektroničke sonde. Na kraju su prezentirani rezultati laboratorijskih ispitivanja, te je dana konačna ocjena izvedbe sonde na temelju početnih tehničkih zahtjeva.

Abstract (english)

In this master's thesis, a methodology for design and implementation of the electronic tool for nondestructive inspection of oil-well casing is presented. The inspection is based on pulsed eddy current method and features determination of basic mechanical properties of the tube (wall thickness and inner diameter measurement).
First of all, initial technical requirements are defined, related to the desired measurement performance of the tool and the demand for operation in high-temperature environment. According to these requirements, the selection of optimal electronic components and circuit design procedures for high-temperature operation is thoroughly discussed. Also, basic failure mechanisms are described, as well as practical design methods for achieving the required functionality and reliability of the tool at temperatures up to 175 °C. Pulsed eddy current based measurement method is analyzed and its main advantages over other applicable methods are shown. The most important features of the method from the instrumentation point of view are specifically highlighted (low power consumption, low length of the tool, shorter inspection period, simpler electronic circuitry). Based on discussions of the measurement method and harsh operating environment, a hardware and software configuration of the electronic tool is proposed. Finally, results of laboratory tests are provided. Verification of the electronic tool design is also performed, based on initial technical requirements.

• Keywords: Nerazorno ispitivanje; impulsne vrtložne struje; zaštitna cijev naftne bušotine; elektronička instrumentacija; visokotemperaturno okruženje; projektiranje i izvedba elektroničkih sklopova; pouzdanost
• Keywords (english): Nondestructive testing; pulsed eddy current; oil-well casing; electronic instrumentation; high-temperature environment; electronic design; reliability
• Language: croatian
• URN:NBN: urn:nbn:hr:168:298105
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-07-16 08:07:32