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    Tytuł:
    Cement slurries used in drilling – types, properties, application
    Autorzy:
    Pikłowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1179537.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    cement grout
    cement slurry
    cementing
    chemical composition
    drilling
    Opis:
    The cement slurry is formed by mixing water with Portland cement or with a mixture of cement containingf various additives. The most important goal of cementing boreholes is to counter the inflow of water into productive levels of rocks with oil and gas. Physico-chemical conditions in borehole have a major effect on the properties of the grouts (bonding, hardening and durability). The most important of these are increased temperature and pressure as well as the presence of reservoir waters, drilling mud and gas migration. The article specifies the requirements for cement grouts used in drilling. The formation process and various types of cement have been characterized due to their phase composition and chemical and mineralogical composition. The treatment methods for the cements of drilling cements are also given. Finally, examples of drilling in the Polish Lowlands are illustrated as a sample of many factors affecting the type, properties and application of cement.
    Źródło:
    World Scientific News; 2017, 76; 149-165
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Receptura zaczynu lekkiego do uszczelniania otworów w strefie niskich ciśnień złożowych
    Formula of lightweight cement slurry for sealing boreholes in the low reservoir pressure zone
    Autorzy:
    Kremieniewski, Marcin
    Pikłowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1834111.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Nafty i Gazu - Państwowy Instytut Badawczy
    Tematy:
    zaczyn cementowy
    zaczyn lekki
    cementowanie otworów wiertniczych
    frakcjonowanie
    sedymentacja
    anizotropia
    cement slurry
    lightweight slurry
    well cementing
    fractionation
    sedimentation
    anisotropy
    Opis:
    In the technology of sealing casing columns in a borehole, sometimes it is necessary to use cement slurry with reduced density. This occurs most often during sealing of the borehole in the low reservoir pressure zone. To design lightweight cement slurry, an addition of filler material is used, the density of which is much lower than the density of cement. However, the presence of such an additive in the structure of fresh cement slurry may sometimes cause destabilization of the system manifested by excessive fractionation, as a result of which light particles migrate to the upper parts of the cement slurry and heavy cement grains sink to the bottom. In addition, cement slurries containing light additives also show reduced values of mechanical parameters, greater porosity and capacity for gas migration, which may disqualify a given cement slurry for use in borehole conditions. In order to eliminate these adverse changes occurring in the structure of both fresh and hardened lightweight cement slurry, admixtures are used to significantly improve the technological parameters of the designed recipe. Appropriate selection, both quantitative and qualitative, of selected agents makes it possible to eliminate the cement slurry fractionation, as a result of which it is possible to obtain a homogeneous structure of the fresh cement slurry, and the cement sheath formed after setting will demonstrate the isotropic properties of the tested mechanical parameters. In addition, additives and low molecular weight admixtures allow sealing of the cement sheath matrix in such a way that the compressive strength is significantly improved and the value of permeability and porosity is reduced. The article discusses the results of research on the development of lightweight cement slurry recipes intended for scaling of openings in the zone of low reservoir pressures. As a control sample, a recipe was selected that had been used in well conditions. This cement slurry was selected for modification due to the lack of sedimentation stability. The following recipes contained various amounts of filling materials. As light additives, filter perlite, aluminosilicate microsphere and glass microsphere were used. However, two forms of silica were used to improve sedimentation stability and obtain appropriate mechanical parameters: a colloidal sodium silicate solution and hydrophilic nanosilica. The designed cement slurry recipes were characterized by appropriate technological parameters and sedimentation stability. The modifications introduced to the cement slurries allowed to achieve a homogeneous microstructure of the hardened cement slurry and an increase in the value of mechanical parameters was obtained. The developed group of recipes can be used to seal openings in the low reservoir pressure zone at a temperature of about 30°C and a pressure of about 3 MPa.
    Źródło:
    Nafta-Gaz; 2020, 76, 9; 577-584
    0867-8871
    Pojawia się w:
    Nafta-Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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