Browsing by Subject "cement slurries"

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Access status: Open Access ,
An application of organic nanosilica to cement slurries based on Portland cement
(2015) Jamrozik, Aleksandra; Stryczek, Stanisław; Wiśniowski, Rafał; Gonet, Andrzej; Wójcik, Rafał
More and more attention is paid nowadays to the quality and durability of the applied cement slurries. Apart from the appropriate rheological, technological and strength parameters, the slurry should be resistant to the strongly mineralized reservoir waters. Appropriate phase composition of cement slurries, especially high CSH content is responsible for the change of pore structure in the cement slurry; the number of fine gel pores which are not available for the fluid increases and the number of capillary pores responsible for the transport of corrosive factors inside the cement slurry decreases. The use of nanosilica as an additive improving the properties of cement slurries has recently gained popularity. Bearing in mind these properties of nSiO2, there were conducted laboratory experiments on the use of organic nanosilica for cement slurries based on Portland cement CEM I 52.5 R.
Access status: Open Access ,
Analysis of technological parameters of cement slurries used for sealing casing in the Lublin Basin area
(2016) Stryczek, Stanisław; Wiśniowski, Rafał; Kremieniewski, Marcin; Rzepka, Marcin; Kotwica, Łukasz; Złotkowski, Albert
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 9 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.
Access status: Open Access ,
Analysis of technological parameters of cementing slurries for horizontal casing works in Pomeranian Basin
(2015) Stryczek, Stanisław; Wiśniowski, Rafał; Kotwica, Łukasz; Złotkowski, Albert; Rzepka, Marcin; Kremieniewski, Marcin; Skrzypaszek, Krzysztof
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.
Access status: Open Access ,
Badania mikrostruktury stwardniałych zaczynów cementowych stosowanych do uszczelniania głębokich otworów wiertniczych
(2006) Stryczek, Stanisław; Brylicki, Witold; Rzepka, Marcin
Hardened cement slurry in a well can be affected by a number of factors, e.g. formation waters, high temperature and high pressure. The borehole conditions and also type of the used binder decide about the microstructure of the slurry. The results of analyses of microstructure of hardened slurries used for cementing production pipes in drilling wells are presented. Cement slurries were made on the basis of drilling cement WG and metallurgical cement CEM III/A 32.5. Samples were exposed to the well-like conditions (in static temperatures 95 degree od Celsius and 120 degree of Celsius and at a pressure of 20 MPa). The microstructure was analysed with SEM and X-ray microanalysis. The obtained results enable an evaluation of the sealing properties of specific binder types, and their correct selection in view of the conditions in deep wells.
Access status: Open Access ,
Influence of bentonite addition on parameters of fresh and hardened cement slurry
(2017) Kremieniewski, Marcin; Stryczek, Stanisław; Wiśniowski, Rafał; Rzepka, Marcin; Gonet, Andrzej
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.
Access status: Open Access ,
Laboratoryjne metody oceny trwałości stwardniałych zaczynów cementowych stosowanych do uszczelniania otworów wiertniczych
(2007) Rzepka, Marcin; Stryczek, Stanisław
The paper deals with laboratory methods of assessing durability of hardened cement slurries used for sealing drilling wells lie in evaluation of, e.g. strength parameters of hardened cement slurry, its porosity and gas permeability as well as the type of the formed microstructure. There are also presented exemplary results of analyses of hardened cement slurries obtained for samples long exposed to the simulated well conditions in highly mineralized waters and temperature 95-120 degrees of Celsius.
Access status: Open Access ,
Laboratoryjne metody określania parametrów technologicznych świeżych zaczynów uszczelniających przed zabiegiem związanym z procesem uszczelniania kolumn rur okładzinowych w otworach wiertniczych
(2008) Rzepka, Marcin; Stryczek, Stanisław
The quality of the applied cement slurry plays an important role in the correct sealing of the well. The composition and parameters of sealing slurry mainly depend on geologic and hydrogeologic conditions of the well in which the binding processes and cement stone formation take place, depth, temperature and pressure downhole. Therefore, prior to the application for sealing casing pipes in a drilling well, the sealing slurry should be analyzed in laboratory conditions. The tests should cover all the technological parameters which could have a direct influence on the course and efficiency of cementing procedure in a drilling well.
Access status: Open Access ,
Possibilities of applying the extended eyring rheological model in the technology of cement slurries used in oil drilling
(Wydawnictwa AGH, 2024) Skrzypaszek, Krzysztof
This study explores the feasibility of implementing an extended Eyring rheological model to describe the dependence between shear stress and shear rate in cement slurries used in drilling technologies. Advances in cement slurry technology have rendered traditional mathematical models, particularly the widely used linear Bingham model recommended by the API RP 13D (American Petroleum Institute Recommended Practice 13D) standard, insufficient for accurately predicting flow resistance during pumping operations. A misalignment between the model and the actual behavior of cement slurries can result in significant errors, potentially increasing operational costs. By identifying and applying the relevant rheological model, it is possible to optimize the system’s performance, minimizing total pressure losses and thereby reducing overall drilling costs. This paper investigates the applicability of more sophisticated three-parameter rheological models, commonly utilized in other engineering disciplines, to address these challenges. Specifically, the extended Eyring model was adapted to the proprietary RheoSolution methodology developed by the Department of Drilling, Oil and Gas. To validate this approach, a series of laboratory tests were conducted on cement slurries widely used in the oil industry. The results were analyzed and compared against mathematical models recommended by the API standard. The findings confirm that the extended Eyring model offers superior accuracy in determining the rheological parameters of cement slurries for drilling applications, underscoring its potential as a robust tool for improving the efficiency of drilling operations.
Access status: Open Access ,
Recipes of cement slurries for sealing casing in deep wellbores
(2016) Rzepka, Marcin; Stryczek, Stanisław; Kremieniewski, Marcin; Wiśniowski, Rafał; Dębińska, Edyta
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/m$^{3}$, 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 cm$^{3}$/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.
Access status: Open Access ,
The influence of anti-sedimentation agents on the technological parameters of cement slurry
(Wydawnictwa AGH, 2017) Kremieniewski, Marcin; Rzepka, Marcin; Stryczek, Stanisław; Wiśniowski, Rafał
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.
Access status: Open Access ,
The influence of ash from fluidized-bed combustion of lignite on rheological properties of cement slurries
(2014) Skrzypaszek, Krzysztof; Stryczek, Stanisław; Wiśniowski, Rafał
Cementing jobs are a very important element of drilling technology considering the completion of a given field. The selection of an appropriate recipe for sealing slurry is a challenge for the cementing services and research units. Both fresh and set slurry should meet a number of technological requirements. Various chemical, physical and mechanical properties of the ground and rock mass media to a different degree influence the technological parameters of the injected fluid. The sealing slurries have to meet certain criteria if the high efficiency of works is to be provided. The first of them is the criterion of physicochemical congruence with the environment. The second condition stems from the criterion of pumping the slurry. It is realized by selecting an appropriate rheological model and rheological parameters of the sealing slurry. The third requirement is connected with the need of providing suitable strength and durability of hardened sealing slurries as a result of the physicochemical processes. The fourth condition should account for the economy and ecology factors. The selection of recipes for sealing slurries should not be accidental or an output of unfniished laboratory tests. The correct sealing and reinforcing of the rock mass are prerequisites of further engineering works performed in the wellbore. The results of laboratory experiments on the concentration of ash from the fluidized-bed combustion of lignites on rheological parameters of fresh sealing slurries based on drilling cement class G (HSR) Dyckerhoff (API Class G HSR - Black Label) for various water/cement ratios are presented in this paper.
Access status: Open Access ,
The influence of selected liquefiers on the rheological parameters of cement slurries
(Wydawnictwa AGH, 2017) Stryczek, Stanisław; Gonet, Andrzej; Wiśniowski, Rafał; Złotkowski, Albert
The rheological properties of sealing slurries are very important when designing and executing cementing jobs and reinforcing ground and rock mass with the use of drilling technology. In order to ensure a high level of efficiency, the applied sealing slurries should meet several requirements. One of the most important criteria is pumpability. The rheological model and the rheological parameters of the sealing slurries should be properly selected to ensure efficient pumping. On this basis the flow resistance of the slurry in the circulation system can be calculated. The paper presents the results of laboratory experiments on the influence of some liquefiers on the formation of rheological properties of cement slurries used for sealing and strengthening rock mass, and for cementing jobs.
Access status: Open Access ,
The influence of time of rheological parameters of fresh cement slurries
(2014) Stryczek, Stanisław; Wiśniowski, Rafał; Gonet, Andrzej; Złotkowski, Albert
The rheological properties of sealing slurries are very important at the stage of designing and realization of works related to the sealing and reinforcement of the ground rock mass with the use of drilling technologies. For providing high efficiency of the works related to the sealing of casing pipes in deep wells and the rock mass with borehole injection methods, the rheological parameters of sealing slurries should be selected depending on [1,2]: — reservoir conditions of ground and rocks to be sealed, — geometry of borehole and circulation system, — interactions between the stream of injected slurry and the resulting flow resistance, especially in the sealed medium. The results of laboratory experiments focusing on the influence of time on the rheological parameters of fresh sealing slurries based on API Class G HSR - Black Label drilling cement (Dyckerhoff) for various water to cement ratios are presented in the paper.
Access status: Open Access ,
Wpływ rodzaju cementu na właściwości reologiczne zaczynów uszczelniających stosowanych w technologiach wiertniczych
(2010) Stryczek, Stanisław; Wiśniowski, Rafał; Gonet, Andrzej; Złotkowski, Albert
Right and optimality design hydraulic of flow cement slurry has influence on good grouting drill casing in wellbore. For this purpose is necessary definite rheological parameter cement slurry and checking in rheological fluid model, which best represented characteristic this composition. Type of used cement and quantity water of concrete mix effected on physic-chemical property and command for each case water-cement ratio rheological model and his mathematic parameter. In paper presentation result laboratory studies measurement rheological parameter four popular used cement in technology of drill casing grouting and command for each rheological model and mathematic value for him.
Access status: Open Access ,
Wpływ solanki na właściwości reologiczne zaczynów uszczelniających z domieszką superplastyfikatorów
(2011) Stryczek, Stanisław; Wiśniowski, Rafał; Gonet, Andrzej; Złotkowski, Albert
The improvement of properties of salt-rock command to use cement slurry to receive with brine and characterize high fluent. One with ways improvement rheological parameters is adding superplasticizer, which working was should check for every worked recipe. In paper describe laboratory investigation influence of five kind superplasticizer of Basf Company on rheological parameter cement slurry.
Access status: Open Access ,
Wpływ superplastyfikatora Glenium® SKY 503 na kształtowanie się właściwości technologicznych zaczynów uszczelniających
(2010) Radzik, Marcin; Stryczek, Stanisław; Gonet, Andrzej; Wiśniowski, Rafał
The quality and efficiency of sealing the casing is significantly conditioned by proper sealing slurry for the casing as well as entire cementing procedure. The selection of slurry parameters depends on individual conditions and the well to be cemented. Sealing slurries should have certain properties so that they can well perform in the well. Sealing slurries should have a strictly defined time of bonding and be pumpable oper the entire time of cementing procedure. Their technological parameters should be considerably stable in high temperatures and pressure conditions which are present at great depths. Hardened cement stone cannot be corroded, cannot be permeable. It should be adhesive to the drilled rocks and casing. It should also have time-unchangeable strength parameters over the whole period in which the field is exploited through a given well. The results of laboratory experiments on the influence of various concentrations of superplastifier Glenium/R SKY 503 on technological parameters of fresh and bonded sealing slurry based on metallurgical cement CEM III/A 32,5 R are presented in this paper.
Access status: Open Access ,
Wyznaczanie oporów laminarnego przepływu zaczynów cementowych, opisywanych modelem Herschela-Bulkleya
(2006) Wiśniowski, Rafał; Stryczek, Stanisław; Skrzypaszek, Krzysztof
Rheological characteristic of cements slurries presently used in practice is presented. Then a rheological model of a non-linear elastic-viscous (Herschel-Bulkley) fluid was given, as recommended for sealing slurries. Suitable dependences were introduced, enabling determination of flow resistances accompanying pumping of the sealing slurry, as described by the Herschel-Bulkley model, through an installment having a spherical and ring cross-section. Methods of determining an equivalent diameter of flow cross-section were given and calculated values for Herschel-Bulkley fluid flowing through an annular space between concentric pipes were compared. A calculational example was given in the closing part of the paper.
Access status: Open Access ,
Zaczyny cementowe odporne na zjawisko migracji gazu
(2011) Kremieniewski, Marcin; Stryczek, Stanisław
The article presents the research results of cement slurries resistant to the gas migration process during the bonding of the slurries in wellbore conditions (HTHP). The research was done on slurries with density range 1.48-1.84 g/cm3, the temperature range was 25-80 degrees of Celsius and the pressure range was 3-42 MPa depending on the conditions. The research was carried out on the specially constructed device. It enables the observation of the gas migration through the slurry in simulated wellbore conditions. The research results were than correlated with the slurry's setting time. Both new and previously used additives that prevent gas migration through the bonding slurry were added during the research.
Access status: Open Access ,
Zaczyny uszczelniające do wypełniania pustek w górotworze solnym
(2011) Stryczek, Stanisław; Gonet, Andrzej; Wiśniowski, Rafał; Złotkowski, Albert
Closing of old salt workings and improving of the rock mass stability necessitates working out of recipes for cement slurry which is resistant to the environment in which is it will be used. Moreover, the slurry should have high liquidity and low permeability. Laboratory analyses of technological parameters of fresh and set sealing slurries made on the basis of granulated ground blast furnace slag and Portland cement CEM I 42,5R with the use of saturated brine of Salt Mine "Wieliczka" are presented in the paper.
Access status: Open Access ,
Zagospodarowanie odpadów wiertniczych jako dodatku do zaczynów cementowych
(2009) Gonet, Andrzej; Jamrozik, Aleksandra; Brylicki, Witold; Czekaj, Lucyna
Certain quantities of waste is produced in oil industry during the drilling operations. Their are mainly used drilling fluids and drilling cuttings which create management problems. The increasing requirements of environmental protection force us to search for more effective methods of neutralizing, management and utilization of waste. The future methods treatment of drill waste is broadly comprehended recycling. The presented results concern the researches cement slurries prepared on base of cement metallurgical CEM III / A 32,5 with an addition of products of roasting of drilling wastes.