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DonNTU Master Stadnyuk Jury Vladimirovich

Stadnyuk Jury Vladimirovich

Mining - geological faculty

Theme of work:

A subsea well formation feature research by submersible hydraulically actuated shells

Supervisor: docent Jushkov Ivan Alexandrovich

E-mail:
yur_sta@mail.ru
Biography Masters work Library Links Search results The individual task

      The urgency of conduct work

    The represented development concerns to offshore drilling engineering-geological wells on a shelf.
    Offshore engineering-geological driiling takes leading place in a offshore engineering-geological researches complex. In present, only this method ensures reception of quantitative values of the physic-mechanical soil parameters. The modern practice of offshore engineering-geological researches has lots of drilling methods. For increase in productivity of bore plant, increase of their use profitability, reduction of cost bottom's rock sampling is necessary permanent research of sampling material process, with the purpose of choices rational drilling method in concrete deposit conditions.

      The purpose and problems of research work

   The purpose of research work is discovering of the influence mechanism stream water on subsea well formation process.

   In this work have been lay down and solve following problems:

  • use experience of pressure flooded water jets in drilling and mining is researched;
  • having generalized approaches to the mechanism of erosion by various authors, is chosen the concrete approach on consistent and inconsistent soils;
  • flow rate, stream velocity on an output from nozzles and on a face, necessary distance up to a face for different diameters is calculated;
  • construction of drilling tool erosion unit on the basis of hydroshock tool UGVP-130 is projected.

          The prospective scientific novelty

       Available erosion soil samplers have a number of defects, as that: restriction on drilling rocks, on drilling depth, on monolit safety.
        The developed scheme allows to realize a two-regime cycle of works:

  • erosion by a solid or ring face;
  • drilling by the hydroshock mechanism.
       It enables to make sampling from any depth of a well, to expand using sphere, to raise its universality.

          The review of available development the set

    The analysis of already existing technologies and designs with the purpose of revealing, finally, their positives and negatives for creation of a new model sampler therefore is supposed.

       At construction the Stalingrad's Hydroelectric power station have been developed and introduced by group of workers: N. D. Duginets, G. À. Seleznev, N. J. Artemyev and Ì. D. Nepenkin a method of hydraulic drilling in a combination with vibrators. This method has gotten the name «hydrovibrodrilling». The method of the wells building consists that dipping pipe in a soil and its partial destruction are made by the vibrator, and final destruction of a soil and its extraction from pipe are made to hydravlic method.

       The conducting researches, in the former USSR and abroad, the opportunity of effective rocks destruction is shown by pressure non-stop jets.

       At National mountain university (Dnipropetrovsk) is developed the design the tool for ring drillings, consisting of the ring case with washing channels and hydromonitor nozzles.

       The Rig ÊÌÎ-3 of laboratory MITMGEO allows to select mmonolits in length up to 4 m and diameter 100 mm from sandy deposits of average density, at depth of the sea up to 30 m. Hydroshock has the hydromonitor nozzle providing use of the fulfilled liquid on washout ring space.

        Developed A.A.Skochinsky NNC SF-IM together with the Tula state technical university and firm NITEP hydromechanical method of destruction of rocks consists in simultaneous influence on a destroyed massif of high pressure water jets and the mechanical tool.

       The Hydrosampler PO-70 is intended for sampling at drilling in sand, silt, clay with a parameter of consistence more than 0,25, and also in loamy soil and loam.
       The basic negative - significant time of selection (> 45 minutes) and insufficient, for the dense deposits, getting ability.

       The rig hydrovibrating submersible (UGVP) are intended for one-trip drilling wells in soils a sandy-argillaceous complex with prolayers of hard rocks.

       The Borehole mining method is based on in-situ water jet cutting of rock mass. BHM is the remote mining method of extracting of mineral resources through boreholes by high-pressure water jets. The borehole-mining tool is lowered into the borehole and at the bottom part of the tool, one portion of that water comes out through the hydro monitor nozzle in a shape of water jet and cuts the material creating slurry, the eductor sucks the slurry and pumps it up to the surface.

    Scheme action of the soil sampler
    Animation illustrates process of sampler action

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    © 2006 Stadnyuk J. V.

    © 2006 DonNTU