{"id":6103,"date":"2026-10-19T09:48:28","date_gmt":"2026-10-19T09:48:28","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-velaverkfraedi-gunnar-skulason-kaldal\/"},"modified":"2026-10-19T09:48:28","modified_gmt":"2026-10-19T09:48:28","slug":"doktorsvorn-i-velaverkfraedi-gunnar-skulason-kaldal","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-velaverkfraedi-gunnar-skulason-kaldal\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed v\u00e9laverkfr\u00e6\u00f0i &#8211; Gunnar Sk\u00falason Kaldal"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p><strong>Doktorsefni:<\/strong>\u00a0Gunnar Sk\u00falason Kaldal<\/p>\n<p><strong>Heiti ritger\u00f0ar:<\/strong>\u00a0Bur\u00f0ar\u00feolsgreining \u00e1 f\u00f3\u00f0ringum h\u00e1hitaborholna (Nonlinear Finite-Element Analysis of Casings in High-Temperature Geothermal Wells )<\/p>\n<p><strong>Andm\u00e6lendur:<\/strong><\/p>\n<p>Dr. Arve Bj\u00f8rset, v\u00edsindama\u00f0ur vi\u00f0 Equinor Research Center og pr\u00f3fessor vi\u00f0 Western Norway University of Applied Science.<br \/> Dr. Catalin Teodoriu, d\u00f3sent og forstj\u00f3ri greiningarmi\u00f0st\u00f6\u00f0var jar\u00f0borana vi\u00f0 Mewbourne School of Petroleum and Geolocical Engineering, University of Oklahoma.<strong><\/strong><\/p>\n<\/p>\n<p><strong>Lei\u00f0beinandi:<\/strong>\u00a0Dr. Magn\u00fas \u00de\u00f3r J\u00f3nsson, pr\u00f3fessor vi\u00f0 I\u00f0na\u00f0arverkfr\u00e6\u00f0i-, v\u00e9laverkfr\u00e6\u00f0i- og t\u00f6lvunarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands.<\/p>\n<p><strong>A\u00f0rir \u00ed doktorsnefnd: <\/strong><\/p>\n<p>Dr. Halld\u00f3r P\u00e1lsson, pr\u00f3fessor vi\u00f0 I\u00f0na\u00f0arverkfr\u00e6\u00f0i-, v\u00e9laverkfr\u00e6\u00f0i- og t\u00f6lvunarfr\u00e6\u00f0ideild.<\/p>\n<p>Dr. Sigr\u00fan Nanna Karlsd\u00f3ttir, pr\u00f3fessor vi\u00f0 I\u00f0na\u00f0arverkfr\u00e6\u00f0i-, v\u00e9laverkfr\u00e6\u00f0i- og t\u00f6lvunarfr\u00e6\u00f0ideild.<\/p>\n<p>\u00a0<\/p>\n<p><strong>Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. R\u00fanar Unn\u00fe\u00f3rsson, pr\u00f3fessor og deildarforseti I\u00f0na\u00f0arverkfr\u00e6\u00f0i, v\u00e9laverkfr\u00e6\u00f0i og t\u00f6lvunarfr\u00e6\u00f0ideildar.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>\u00c1grip<\/strong><\/p>\n<p>H\u00e1hitaborholur eru bora\u00f0ar \u00ed \u00e1f\u00f6ngum og f\u00f3\u00f0ra\u00f0ar me\u00f0 st\u00e1lf\u00f3\u00f0ringum sem eru steyptar a\u00f0 utanver\u00f0u. Vegna \u00f6ryggissj\u00f3narmi\u00f0a ver\u00f0ur a\u00f0 vera h\u00e6gt a\u00f0 beisla jar\u00f0hitav\u00f6kva jafnt \u00ed borun sem og \u00ed vinnslu eftir a\u00f0 framkv\u00e6mdum er loki\u00f0. \u00cd \u00f6llum tilvikum \u00fearf bur\u00f0ar\u00feol f\u00f3\u00f0ringa a\u00f0 vera tryggt. \u00c1 me\u00f0an borun stendur er borholum haldi\u00f0 k\u00f6ldum me\u00f0 hringd\u00e6lingu borle\u00f0ju e\u00f0a \u00e1d\u00e6lingu me\u00f0 vatni. \u00deegar \u00fe\u00e6r hitna eftir borun getur hitastigsh\u00e6kkunin or\u00f0i\u00f0 umtalsver\u00f0. Varma\u00feensla veldur spennumyndun \u00ed f\u00f3\u00f0ringunum vegna skor\u00f0unar steypunnar. \u00deegar hef\u00f0bundnar h\u00e1hitaholur hitna myndast \u00fev\u00ed h\u00e1ar spennur sem \u00ed flestum tilvikum valda varanlegum formbreytingum. A\u00f0 auki veldur h\u00e1tt hitastig styrktarveikingu \u00ed st\u00e1li og steypu sem lei\u00f0ir til aukinnar h\u00e6ttu \u00e1 skemmdum. F\u00f3\u00f0ringaskemmdir, s.s. g\u00falpmyndun og togslit, geta or\u00f0i\u00f0 \u00e1 mismunandi stigum \u00e1 l\u00edft\u00edma borholna og er \u00fev\u00ed mikilv\u00e6gt a\u00f0 greina \u00edtarlega \u00e1lagss\u00f6gu f\u00f3\u00f0ringa til a\u00f0 skilja m\u00f6guleg \u00e1lagstilfelli og h\u00e6ttur sem fylgja. Me\u00f0 auknum \u00e1huga \u00e1 dj\u00fapborun til vinnslu \u00e1 orkur\u00edkum jar\u00f0varmav\u00f6kva ver\u00f0ur bur\u00f0ar\u00feol f\u00f3\u00f0ringa einn af takamarkandi \u00fe\u00e1ttunum vegna h\u00e6rra hitastigs, \u00fer\u00fdstings, og aukinnar efnis\u00e1raunar \u00ed formi t\u00e6ringar. Afkastageta borholna r\u00e6\u00f0st ekki einungis af \u00fev\u00ed a\u00f0 gj\u00f6fular \u00e6\u00f0ar s\u00e9u rofnar \u00ed borun heldur einnig af l\u00edft\u00edma mannvirkisins. \u00d3l\u00ednulegir efniseiginleikar, f\u00e6rslur og tenging \u00e1 milli yfirbor\u00f0a \u00ed borholum mynda bur\u00f0ar\u00feolskerfi sem ekki er au\u00f0leysanlegt me\u00f0 einf\u00f6ldum reiknia\u00f0fer\u00f0um. Bur\u00f0ar\u00feolskerfi\u00f0 er \u00fev\u00ed leyst h\u00e9r me\u00f0 einingaa\u00f0fer\u00f0inni (e. nonlinear finite-element method) \u00fear sem \u00f3l\u00ednuleiki kerfisins er tekinn me\u00f0 \u00ed reikninginn. L\u00edk\u00f6nin sem \u00fer\u00f3u\u00f0 hafa veri\u00f0 h\u00e9r er h\u00e6gt er a\u00f0 nota til bur\u00f0ar\u00feolsgreiningar \u00e1 f\u00f3\u00f0ringum til varnar skemmdum og til a\u00f0sto\u00f0ar vi\u00f0 h\u00f6nnun og efnisval. Doktorsritger\u00f0in l\u00fdsir f\u00f3\u00f0ringaskemmdum og bur\u00f0ar\u00feolsgreiningum sem byggja grunn til betri skilnings \u00e1 bur\u00f0ar\u00feoli f\u00f3\u00f0ringa h\u00e1hitaborholna.<\/p>\n<p>\u00a0<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Gunnar lauk B.Sc. gr\u00e1\u00f0u \u00ed v\u00e9laverkfr\u00e6\u00f0i fr\u00e1 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2007 og M.S. gr\u00e1\u00f0u \u00e1ri\u00f0 2009 fr\u00e1 sama sk\u00f3la. Eftir brautskr\u00e1ningu h\u00f3f hann doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands. Hluti n\u00e1msins f\u00f3r fram vi\u00f0 N\u00fdsk\u00f6punarmi\u00f0st\u00f6\u00f0 \u00cdslands.<\/p>\n<p>Me\u00f0 n\u00e1mi hefur Gunnar sinnt stundakennslu vi\u00f0 H\u00e1sk\u00f3la \u00cdslands og Jar\u00f0hitask\u00f3la H\u00e1sk\u00f3la Sameinu\u00f0u \u00fej\u00f3\u00f0anna og unni\u00f0 \u00ed fullu starfi sem verkfr\u00e6\u00f0ingur hj\u00e1 \u00cdslenskum orkuranns\u00f3knum (\u00cdSOR) fr\u00e1 \u00fev\u00ed \u00ed okt\u00f3ber 2015.<\/p>\n<\/div><\/div>","protected":false},"featured_media":1892,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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