Izbira jedrnikov pri geomehanskem vrtanju

diplomsko delo

Simon Bajuk (Author), Željko Vukelič (Mentor), Jurij Šporin (Co-mentor)

Abstract

Pravilna izbira jedrnikov pri geomehanskem vrtanju je le eden izmed ključev do kvalitetno pridobljenega jedra. Trenutno so v uporabi že nekaj časa razviti enostenski, dvostenski in trostenski jedrniki, ki pa jih zaradi potrebe izvleka celotnega drogovja ob pridobivanju jedra v svetu počasi nadomeščajo novejše in naprednejše metode jedrovanja. Dve izmed takih metod sta metoda jedrovanja »wire line« in pridobivanje jedra po metodi sonic, ki za razliko od ostalih omogočata pridobitek jedra v krajšem časovnem intervalu. Metoda jedrovanja po sistemu »wire line« je bila razvita predvsem zaradi časovnih prihrankov v smislu skrajšanja časovnega manevra pri odstranjevanju jedrnika iz vrtine ter ponovne vgradnje nazaj v vrtino. Pri metodi jedrovanja sonic pa je za napredovanje jedrnika v formacije tal v uporabi visokofrekvenčna resonančna energija. Med vrtanjem se energija transportira preko vrtalnega drogovja do vrtalne glave z različnimi soničnimi frekvencami. Različne karakteristike, prednosti in slabosti jedrnikov in jedrnih metod smo opisali in našteli v prvem delu diplomskega dela. V nadaljevanju smo opisali vplivne parametre na kvaliteto in kvantiteto pridobljenega jedra. Izbira vrtalne krone, s katero napredujemo, je pomembna, saj je prva komponenta na celotnem sestavu vrtalnega drogovja. Običajno so v uporabi diamantne krone in krone iz karbidnih materialov. Za boljše in hitrejše napredovanje v formacije tal je v uporabi izplačni medij. Glavna naloga izplačnega medija, ki kroži skozi vrtalno drogovje in nato po obodu vrtine na površje, je, da v toku kroženja izpira in s seboj iznaša izvrtanino.

Keywords

geomehansko vrtanje;izbira jedrnikov;jedrovanje;jedro;metoda sonic;metoda wire line;

Data

Language:	Slovenian
Year of publishing:	2017
Typology:	2.11 - Undergraduate Thesis
Organization:	UL NTF - Faculty of Natural Sciences and Engineering
Publisher:	[S. Bajuk]
UDC:	622
COBISS:	1695071
Views:	942
Downloads:	665
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Core barrel selection for geomechanical drilling
Secondary abstract:	The correct selection of core barrels in geomechanical drilling is only one of the keys to get well drilled core sample. Currently are in use single tube, double tube and triple tube core barrels. Beacuse of need to pull out all the drill rods of borehole to get sample are now slowly replaced with newer and more advanced methods of core sampling. Two of the more advanced methods are; the »wire line« method of sampling and sonic sampling. These two methods can provide core in less time than other previously mentioned methods. The »wire line« method was developed mainly beacuse of saving time due to pull in and out core samppler. In the sonic method of samppling, high frequency resonance energy is used to drill in formations. During drilling, energy is transported trough drill rods to a drill head with different sonic frequences. In first part of diploma thesis work i described different characteristics, advantages and disadvantages of core barrels. In continuation i was describing influential parameters on the quality and quantity obtained core. The selection of the drill bit with which we are drilling is important, beacuse it is the first component on the whole drill assembly. Usually, diamond crowns and crowns of carbide materials are in use. For faster progression in formations, the drilling fluids are in use. The main task of fluid, which circulate through the drill rods and then back to the surface is to collect and amount the cuttings from the working face.
Secondary keywords:	geomechanical drilling;core barrel selection;sonic method;coring;corre;wire line method;
Type (COBISS):	Final paper
Study programme:	0
Thesis comment:	Univ. Ljubljana, Naravoslovnotehniška fak., Oddelek za geotehnologijo, rudarstvo in okolje
Pages:	VII, 38 f.
ID:	10910695