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Browsing by Author "Simon, Katarina"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Cleaning capability of different fluid systems used in coiled tubing drilling
    (2005) Simon, Katarina; Gaurina-Medimurec, Nediljka; Matanović, Davorin; Krištafor, Zdenko
    Coiled tubing drilling (CDT) worldwide has grown tremendously in the last decade. In well drilling application gas, foam and liquid (mud) can be used as drilling fluid. The use of a liquid is much simpler and cheaper than the other alternatives and should therefore be considered wherever possible. Using of biopolymer fluid systems is widely accepted. One of the most important fluid system characteristics is hole-cleaning capability, because coiled tubing rotation is not possible. Results of laboratory testing of different fluid systems as well as fluid flow simulation for different geometries of wellbore in term of efficient cuttings transport during coiled tubing drilling are presented in the paper.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Contribution in testing swelling packers behavior
    (2009) Matanović, Davorin; Simon, Katarina; Gaurina-Medimurec, Nediljka; Pašić, Borivoje; Malnar, Matija
    Effect of polymer swelling that was considered to be a problem, gives today a possibility, to complete wells that are a problem one for conventional packer setting and sealing. Polymers (rubbers) can swell in hydrocarbons or water based fluids as well. Several ways of application have been accepted. Mainly they are connected with open hole and sand screen completions in unconsolidated formations. The ability of changing the volume to more than several hundred percent, can help to avoid packer failure. When defining swelling packer elements it is important to determine their mechanical properties, swelling speed in various fluids, and stability (ageing tests). To implement home made products it was necessary to provide laboratory testing equipment for such purpose. The developed apparatus enables use of different fluids, temperature change up to known reservoir temperature, and pressure differential that element can withstand.