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Izbira izplačnega fluida pri izdelavi globokih geotermalnih vrtin
Es, Marko (Author), Vukelić, Željko (Mentor) More about this mentor... This link opens in a new window

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Abstract
V magistrskem delu je predstavljena tehnologija rotacijskega vrtanja in vloga izplačnega fluida pri rotacijskem vrtanju. Razložen je cirkulacijski sistem izplačnega fluida in njegovi sestavni deli. Obravnavane so funkcije in potrebne lastnosti izplačnega fluida, ki nam pomaga uspešno izvesti globoko geotermalno vrtino. V magistrski nalogi so predstavljeni tudi posamezni dodatki izplačnim fluidom ter njihovi vplivi na posamezne lastnosti izplačnih fluidov. Opisani so tudi postopki merjenja lastnosti izplačnih fluidov kot tudi naprave za njihovo merjenje. Kot konkreten primer je predstavljena vrtina globine 2400 metrov. Za to vrtino je izdelana receptura izplačnega fluida za posamezne intervale vrtanja, na koncu pa imamo tudi preglednico, v kateri so zapisane skupne količine potrebnih dodatkov izplaki za celotno izvedbo vrtine. Glavni namen magistrske naloge je pokazati, kako optimalno izbrati izplačni fluid za izdelavo globokih geotermalnih vrtin. V konkretnem primeru je bila izplaka na vodni osnovi z dodatkom gipsovega polimera, za katero menim, da se lahko enakovredno meri s klasično bentonitno izplako oziroma jo v določenih lastnostih celo prekaša. Glavna prednost je stabilizacija potencialno nestabilnih skrilavcev in glinenih plasti v formaciji. Pri izbranem izplačnem fluidu obstajajo tudi določene omejitve. Glavna omejitev je višina temperature. Polimerne izplake so namreč stabilne do temperature 120 °C, vendar lahko z dodajanjem določenih kopolimerov zvišamo stabilnost izplake vsaj do 162 °C, kar pomeni, da so polimerni izplačni fluidi na vodni osnovi primerni za izdelavo globokih geotermalnih vrtin do globine 3000 metrov na območju severovzhodne Slovenije.

Language:Slovenian
Keywords:izplačni fluid, gipsov polimer, globoke geotermalne vrtine
Work type:Master's thesis/paper (mb22)
Organization:NTF - Faculty of Natural Sciences and Engineering
Year:2018
COBISS.SI-ID:1728607 Link is opened in a new window
Views:443
Downloads:196
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Secondary language

Language:English
Title:Design of drilling fluid for deep geothermal wells
Abstract:
This master thesis presents the technology of rotary drilling as well as the role of drilling fluid in the process. Drilling fluid circulation system is also explained in this thesis. The functions and necessary properties of drilling fluids which are essential for the construction of deep geothermal well have been treated. Drilling fluid additives and their impact on drilling fluid properties is presented and well explained. The procedures for measuring drilling fluid properties and their corresponding measuring equipment have also been described. As a real case, a geothermal well of depth 2400 meters was purposed. Recipe for drilling fluid with ingredients for all the intervals was designed for individual intervals of drilling. At the end is a table that summarises quantities of necessary additives. The main objective of thesis is to show how to optimally choose drilling fluid for deep geothermal well completion. For the purpose of this study, a water based drilling fluid with gypsum polymer additive was chosen. This was selected because, it can fulfil all the necessary functions just as good as traditional bentonite drilling fluid, or even better sometimes. The main advantage of gypsum polymer drilling fluid is its good stabilisation of unstable shales and clay layers in formations. There are also some disadvantages associated with using polymer drilling fluid. The main limitation here is temperature because most polymers are only stable until 120 °C, but by adding specific co-polymers, the stability of polymer mud can be increased to at least 162 °C. This draws the conclusion that water-based gypsum-polymer drilling fluids are suitable for drilling deep geothermal wells as deep as 3000 meters in north-eastern Slovenia.

Keywords:drilling fluid, gypsum polymer, deep geothermal wells

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