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    Wyświetlanie 1-5 z 5
    Tytuł:
    Influence of bentonite addition on parameters of fresh and hardened cement slurry
    Autorzy:
    Kremieniewski, M.
    Stryczek, S.
    Wiśniowski, R.
    Rzepka, M.
    Gonet, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/298669.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cement slurries
    bentonite
    Opis:
    The recipe of cement slurry contains a number of additives and admixtures used for obtaining appropriate technological parameters. Some of these agents have a loose form and their density is higher or lower than that of working water, which may result in sedimentation of solid phase. For the sake of eliminating this effect, the viscosity of the working fluid should be increased to keep the fine solids over the entire volume of the slurry. This can be done with the use of appropriate high-molecular polymers. However, bearing in mind the cost of the polymers, bentonite is most frequently applied. Bentonite (montmorillonite) has a packet build and the resulting higher water-demand causes an increase of viscosity of working fluid. It is most frequently used to improve the sedimentation stability, though the presence of this additive is not neutral for the technological parameters of the slurry. During research works aimed at analyzing the influence of montmorillonite on the parameters of fresh and hardened cement slurry predefined quantities of bentonite were used in proportion to the working water. Reference recipes of slurries were worked out to trace the changes. The following properties of the slurry were defined: rheological parameters, filtration, thickening time, water settling, sedimentation stability. For hardened cement samples the bentonite addition was analyzed in view of its influence on the mechanical properties (compressive strength), physicochemical parameters (adhesiveness to steel pipes and adhesiveness to rock formation). Additionally, hardened cement slurry underwent analyses describing the microstructure of the sample porosity and permeability tests). For the sake of determining the influence of mineral additives on parameters of slurry and the hardened slurry there were performer tests for recipes of slurries to be used in wellbore conditions at temperature from 30°C to 90°C and pressure from 5 MPa to 35 MPa.
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 2; 335-348
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of technological parameters of cement slurries used for sealing casing in the Lublin Basin area
    Autorzy:
    Stryczek, S.
    Wiśniowski, R.
    Kremieniewski, M.
    Rzepka, M.
    Kotwica, Ł.
    Złotkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/298876.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cement slurries
    Lublin Basin
    Opis:
    Both fresh and hardened cement slurries should meet respective standards. Recently the Faculty of Drilling, Oil and Gas AGH UST and Oil and Gas Institute – National Research Institute have recently realized works within the OPTIDRILLTEC project aimed at the modification of the existing and working out of new recipes of slurries to be used for sealing wells on shale deposits. For this reason a crew of specialists realized scientific analyses with the use of high class control and measuring systems. These are, among others, pressure consistometers, filtration presses, viscometers, apparatus for measuring permeability and migration of gas, mercury porosimeter, ultrasound cement analyzer, strength testing machine. The investigations of cement slurries are aimed at working out recipes of slurries for sealing casing in wellbores drilled in shale gas formations.
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 1; 145-158
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of technological parameters of cementing slurries for horizontal casing works in Pomeranian Basin
    Autorzy:
    Stryczek, S.
    Wiśniowski, R.
    Kotwica, Ł.
    Złotkowski, A.
    Rzepka, M.
    Kremieniewski, M.
    Skrzypaszek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/299052.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cement slurries
    horizontal casing works
    Opis:
    Paper presents results of investigation on the properties of cement slurries used in casing works in horizontal wells. Six slurries were investigated. Each slurry was optimized to fulfill the demands of a particular well drilled in Pomeranian Basin in northern Poland. Slurries were designed the way to obtain flow diameter in the range 240-270 mm and exhibiting no sedimentation. Special emphasis was put on the stability of the slurries, due to high requirements for stability of slurries used in casing works in horizontal wells. Slurries were cured in conditions characteristic for particular wells (pressure in the range between 35 and 49 MPa, temperature in the range between 80 and 90 degrees of Celsius). For hardened slurries mechanical properties were determined. Phase composition of hardened slurries was determined with XRD and thermal analysis. In addition microstructural observations were done in order to determine the influence of temperature on microstructure of hardened cement matrix.
    Źródło:
    AGH Drilling, Oil, Gas; 2015, 32, 2; 431-442
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technological parameters of innovative cement slurries used for sealing wellbores in shale formations
    Autorzy:
    Kremieniewski, M.
    Rzepka, M.
    Stryczek, S.
    Wiśniowski, R.
    Kotwica, Ł.
    Złotkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/298705.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cement slurry
    well cementing
    sealing ceasing
    shale formations
    Opis:
    In the years 2014–2016 two scientific units, i.e. Faculty of Drilling, Oil and Gas, AGH UST and Oil and Gas Institute – National Research Institute cooperated on the realization of a project called Optidrilltec. A group of innovative recipes of slurries to be used for sealing wellbores in shale formations were worked out. Both fresh and hardened cement slurries should meet restrictive technological requirements, therefore this issue was in the focus of the conducted research. Laboratory experiments were performed on high-class research and control/measurement equipment, thanks to which innovative recipes of cement slurries for sealing casing in shale gas formations could be worked out. These recipes comply with standards and can be successfully used as read-made applications for sealing casing installed in shale formations.
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 4; 781-800
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the efficiency of cleaning annular space with a new flushing fluid
    Autorzy:
    Kremieniewski, M.
    Rzepka, M.
    Stryczek, S.
    Wiśniowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/298916.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    flush fluid
    buffer fluid
    cementing casing columns
    flushing annular space
    surface active agents
    surfactants
    annular space
    Opis:
    One of the most important conditions to be met when cementing casing columns is obtaining appropriate tightness of the sealed interval, otherwise gas will have to be released from the annular space due to the dangerously high pressure in the upper part of the well. Gas migrating along the well in the annular space can penetrate directly the soil, groundwater or atmosphere. To counteract these unfavorable effects the casing columns are sealed and the annular space filled with appropriate cement slurry. During injection, the slurry displaces mud from the annular space. However mud residue left out in the wellbore walls may cause that the slurry does not bond the rock sufficiently well and consequently gas may flow on the hardened cement slurry/rock/casing contact. This effect can be eliminated by thorough cleaning of the annular space from mud cake with flush fluid, followed by its complete displacement with buffer fluid and cement slurry. Hence it is crucial for the efficiency of cementing to precede this job with thorough cleaning of the annular space with appropriate flush fluids. Laboratory experiments were undertaken to work out a new flush fluid with which the efficiency of removal of filtration cake from the wellbore walls and the cleaning of the annular space will be improved. Tests were performed for a group of agents, which appropriately selected as far as their quantity and quality is concerned, could create bases for a new type of fluid with very good flushing properties. The efficiency of mud cake removal was analyzed in a mud flow simulator. The analysis of the results revealed that the efficiency of removal of the mud cake on the rock surface can be improved by synergic operation of surfactants and surface active agent, when they are used in good concentrations. The influence of the injection volume and duration of contact of the flush fluid with the rock were taken into account as the main emphasis was on how to increase the efficiency of the designed fluid on the near well zone. The works on the new recipe of flush fluid and its efficiency were based on the measurement of adhesiveness of hardened cement slurry and the rock sample, from which mud cake was removed with the use of flush fluid. The analysis of the laboratory results shows that the efficiency of mud cake removal was considerably increased when the presented flush fluid was applied.
    Źródło:
    AGH Drilling, Oil, Gas; 2018, 35, 1; 219-233
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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