Komparativna analiza metoda pseudoizacije

master's thesis

• Title: Komparativna analiza metoda pseudoizacije : diplomski rad
• Title (english): Comparative analysis of methods of pseudoisation : master's thesis
• Author: Dino Dadić
• Mentor: Domagoj Vulin (mentor)
• Committee member: Domagoj Vulin
• Committee member: Tomislav Kurevija
• Committee member: Borivoje Pašić
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Petroleum and Gas Engineering and energy); Zagreb
• Defense date and country: 2015-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Petroleum Mining

Abstract

Jedan od najtežih zadataka u pVT (engl. pressure-volume-temperature) karakterizaciji ležišnih fluida je opis sastava C7+ frakcije koji će kasnije rezultirati kvalitetno podešenom jednadžbom stanja i realističnim simuliranim podacima. Laboratorijski izvještaji ležišnih fluida obično daju ograničen sastav i opis težih komponenata - ugljikovodici teži od heksana grupiraju u C7+ frakciju s određenom (izmjerenom) molarnom masom i relativnom gustoćom. Upravo takva definicija teških komponenata stvara glavne probleme pri predviđanju termodinamičkih svojstava i volumetrijskog ponašanja ležišnih fluida. Stoga je svrha C7+ karakterizacije dobiti bolji opis nedefiniranih komponenata pomoću pseudokomponenata tako da se eksperimentalni pVT podaci usporede s predviđenima karakterizacijom jednadžbom stanja (JS). U radu je detaljno razrađeno dijeljenje plus frakcije Whitsonovom metodom, koja se najčešće koristi u praksi za definiciju plus frakcije. Ta metoda polazi od statističke obrade raspodjele komponenata u proširenom sastavu, te na temelju karakteristike te raspodjele definira pseudokomponente. Pri tome su parametri statističke raspodjele determinirani tako da se računski odredi prošireni sastav, a zatim, pošto bi numeričko rješavanje i podešavanje parametara za toliki broj komponenata bilo presloženo, ponovo se, pošto su im poznata fizikalna svojstva, niz tih komponenata grupira i radi se podešavanje parametara JS na samo nekoliko pseudokomponenata, najčešće 3 do 5. Statističkom obradom, kakva je korištena u ovom radu, moguće je „ugladiti“ prošireni sastav. Time se mogu umanjiti problemi koji nastaju zbog mjerne pogreške, i na novi način se može definirati sastav do C7+ ,kakav se standardno koristi za podešavanje JS.

Abstract (english)

Abstract: One of the most complex tasks in pVT characterization of reservoir fludis is describing the compsotion of C7+ fraction on which depends the quality of prediction of EOS (equation-of-state) and simulation data. Experimental data usually gives limited composition and description of heavy ends – usually all hydrocarbones heavier than hexane are lumped into single C7+ fraction with measured molecular weight and specific gravity. It has become clear that insufficient description of heavier components reduces the accuracy of pVT predictions.. The main purpose of C7+ characterization is getting better description of heavy fraction by lumping various SCN groups into pseudocomponents and matching experimantal pVT data with those predicted with EOS characterization. Distribution of plus fraction by Whitson's method, which is commonly used for descrbing the plus fraction, is analized in thesis. That method is based on statistic preocessing of divison of components in expanded composition, and based on characteristics of that distribution defines 3 -5 pseudocomponents. Statistic processing, as one described in thesis, can be used for „smoothening“ expanded composition. That reduces the problems caused by measuring errors, and in new way defines the compsition up to C7+ which is commonly used for EOS predicitons.

• Keywords: raspodjela; pseudoizacija i pravila miješanja; gama distribucija; Gaussova kvadratura
• Keywords (english): distribution; pseudoization; mixing rules; gamma distribution; Gaussian quadrature
• Language: croatian
• URN:NBN: urn:nbn:hr:169:342689
• Study programme: Title: Petroleum Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka naftnog rudarstva (magistar/magistra inženjer/inženjerka naftnog rudarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2015-12-16 10:09:43