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    Tytuł:
    Correlation of parameters describing microstructure of hardened cement slurry for the purpose of increasing tightness of cement mantle
    Autorzy:
    Kremieniewski, M.
    Stryczek, S.
    Wiśniowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/298675.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    permeability
    porosity
    hardened cement slurry
    threshold diameter
    threshold radius
    threshold pressure
    boundary effect
    Opis:
    The results of laboratory experiments on fresh cement slurries are presented in this paper. The samples of hardened cement slurry were hydrated for 28 days in wellbore-like conditions and then analyzed for parameters describing their microstructure. The obtained results created a basis for a correlation analysis of parameters of microstructure of hardened cement slurries. The dependences having the big-gest effect on increasing the tightness of the cement mantle were also addressed to.
    Źródło:
    AGH Drilling, Oil, Gas; 2014, 31, 3; 413-421
    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
    Tytuł:
    Comparison of gas migration test and building structural strength of slurry in the aspect of limiting gas invasion
    Autorzy:
    Kremieniewski, M.
    Rzepka, M.
    Stryczek, S.
    Wiśniowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/298587.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    gas migration
    structural strength
    cement slurry
    hardened cement slurry
    transition period
    transition time
    Opis:
    The problem of eliminating natural gas microflows through the cement slurry while bonding has been investigated by scientists in a number of scientific and research centers. Works have been undertaken to define the causes of gas migration and predict possibilities of interchannel communication in the hardened cement slurry. In the course of bonding cement slurry changes its state from liquid through gel to solid. Accordingly, the gas migration effects should be taken into account in the formation of these phases. The results of tests of gas migration in the course of binding and building structural strength have been presented in this paper. Both research methods have been compared and a high dependence of parameters defined by each of them has been found. The research works were conducted with the use of innovative apparatuses thanks to which the phenomena taking place in the course of binding can be observed. This gives the possibility of working out recipes of sealing slurries applicable to deposits where the risk of occurrence of gas migration is high.
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 3; 595-608
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure of porous space in cement sheath used for sealing oil wells
    Autorzy:
    Kremieniewski, M.
    Rzepka, M.
    Stryczek, S.
    Wiśniowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/298870.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cement slurry
    drilling
    oil wells
    Opis:
    The effect of cement slurry modification on the microstructure of the annular space in a wellbore is presented in this paper. An admixture of macromolecular copolymer GS was used, which is usually applied in cement slurry technology to counteract gas migration by the binding cement slurry. The copolymer addition also results in sealing up the cement matrix at the stage of the binding and formation of hardened cement slurry. The modification of a slurry composition with this admixture results in the fact that the cement matrix has low porosity and is strongly compact. Consequently, a significantly higher number of micropores with small diameters are formed than those with larger micropores in the analyzed hardened cement slurry sample. An admixture of a macromolecular copolymer (7 wt.% of the cement) was added and 10% of the latex was removed from the recipe to show the influence of the modified recipe on the microstructure of the cement sheath. Thanks to this modification, the microcement participation could be reduced by 50% with the simultaneously improved quality of the most important technological parameters of fresh and hardened cement slurry. The basic and modified recipes were analyzed. The following parameters of the slurry were determined: rheology, filtration, water settlement, and time of densification. The influence of the modified slurry on the parameters describing the microstructure of the hardened slurry was analyzed for the hardened slurry (i.e., porosimetric porosity and microtomographic porosity). The microstructure of a sample fracture was also investigated. The analyses were conducted for recipes of slurries to be used for sealing wells at a temperature of 40°C and pressure of 10 MPa.
    Źródło:
    AGH Drilling, Oil, Gas; 2018, 35, 3; 433-442
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of anti-sedimentation agents on the technological parameters of cement slurry
    Autorzy:
    Kremieniewski, M.
    Rzepka, M.
    Stryczek, S.
    Wiśniowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/298824.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    sealing slurries
    rheological properties
    rheological models
    superplastifiers
    cement slurries
    Opis:
    Recently, the intensifying development of shale drilling has contributed to the more numerous realization of directional and horizontal boreholes. Moreover, such boreholes are more advantageous as they provide about 4 times higher production than in their vertical counterparts, give access to poorly drained areas, or production of already developed reservoir, where only a new borehole has to be introduced to the network. It should be stressed that the sealing of the casing columns is a challenge because of the restrictions set before drilling fluids used for sealing horizontal boreholes. Slurries play a special role while sealing horizontal boreholes and therefore their technological parameters and density should be adjusted to the geological-reservoir conditions. At the stage of designing slurries for sealing horizontal boreholes, the most important parameters are: sedimentation stability, zero water settling water settling and low filtration. Meeting these requirements was possible by selecting proper admixtures and additives, which in turn, is a guarantee of the uniform and homogeneous structure of fresh and hardened cement slurry. Thus formed cement sheath of bounded slurry should be impervious to gas and have good mechanical properties over the length of the sealing without any trends of anisotropy of the medium in particular points. Modification and designing specialist recipes for definite technological conditions lie, among others, in choosing proper slurry additives and admixtures. However, obtaining appropriate parameters for given conditions may be connected with a change of other parameters deciding about the efficiency of the sealing of a given horizon. Therefore while working out a new recipe for a slurry, the designer should account for the analytical results and influence of the applied agents on all of the parameters of slurry. This is the subject matter of the paper.
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 4; 945-957
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recipes of cement slurries for sealing casing in deep wellbores
    Autorzy:
    Rzepka, M.
    Stryczek, S.
    Kremieniewski, M.
    Wiśniowski, R.
    Dębińska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/298793.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cement slurries
    deep wellbores
    Opis:
    The authors of this paper discuss issues connected with the sealing of deep casing columns. The results of analyses of cement slurry recipes recently used for sealing wellbores in Poland have been presented. Laboratory experiments were performed on samples at temperature 90–120 degrees of Cesius and pressure 60–70 MPa. Recipes of slurries were worked out at the Oil and Gas Institute Section in Krosno and Cement Services (EXALO group). Slurries were based on 10% NaCl brine with such additives as: – 20–25% of latex (prevents gas migration and lowers filtration); – silica powder (increases thermal resistance of hardened cement slurry at high temperature); – hematite (weighing material: 30–110% of cement mass); – microcement (sealing up the cement matrix). The G type HRS drilling cement, meeting standard ‘PN-EN ISO 10426-1 “Oil and gas industry” – Cements and materials for cementing wellbores’, was used as a binder. The density of the presented slurries ranged between 2050 and 2350 kg/m3, plastic viscosity a hundred or so mPa•s and thickening time from 3.5–6 hrs. The filtration of slurry oscillated between 30 and 40 cm3/30 min, with zero water settlement. The compressive strength of hardened sealing slurries was high (frequently over 30 MPa). The detailed analyses of slurries and hardened cement slurries as well as works on the improvement of recipes, resulted in the systematic improvement of the quality of cementing jobs on production casing in deep wellbores on hydrocarbon deposits.
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 2; 455-470
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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:
    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
      Wyświetlanie 1-10 z 10

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