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    Wyświetlanie 1-5 z 5
    Tytuł:
    Slimhole well casing design for high-temperature geothermal exploration and reservoir assessment
    Autorzy:
    Kruszewski, M.
    Thorhallsson, S.
    Assadi, M.
    Śliwa, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/298892.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    geothermal exploration wells
    slimhole casing
    Opis:
    It is anticipated that utilization of geothermal resources for renewable energy production will continue to grow globally. Since cost of drilling and well construction constitutes a considerable share of the total cost of the geothermal installations, development and evaluation of low-cost alternatives is crucial for expansion of this industry. This paper describes slimhole casing design for geothermal exploration wells, as an alternative for reduced cost and improved environmental performance. The main goal of the paper is to contribute to cost effective casing design program that satisfies severe reservoir conditions of geothermal wells. A case study is presented for casing design for a 2000 m deep vertical well with water level at 200 m, where the New Zealand Code of Practice has been applied. The “worst case scenario”, i.e. when temperature and pressure follow the boiling point depth curve (BPD), has been considered as base case for the casing design, when drilling in a high-temperature geothermal area. Alternative methods are also presented for determining the minimum casing setting depths and the results are compared. Pressure and temperature conditions inside the well were established using X-steam program, an Excel add-in, and the final results, establishing loading criteria that the casing has to withstand i.e.: burst, collapse and tension/compression are presented.
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 2; 465-493
    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:
    The importance of the formation and fracture pressures for the selection of the depths for casing setting in Slovakia
    Autorzy:
    Pinka, J.
    Kucirkova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/298914.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    casing strings
    fracture pressure
    pore pressure
    fracture gradients
    Opis:
    Different oil companies place shallow casing strings at different depths. Apparently there is no general method or procedure that gives the optimal location. This article is an attempt to define this optimum casing seat location. The potential benefits will improve safety and economy of the operation. The two major factors determine the depth of the casing shoe, that is, the fracture pressure and the pore pressure. A third factor is the lithology, because it is desirable to place the casing shoe in a competent shale section. The methods of predicting fracture gradients for deeper wells already exist. In this article, a method of predicting fracture gradients for shallow well has been derived. This method is combined with kick tolerance criteria to obtain a casing depth selection method. Also, the variation in fracture pressures at any depth has been investigated.
    Źródło:
    AGH Drilling, Oil, Gas; 2015, 32, 2; 381-394
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Criteria and risk of integrity loss for wells with sustained casing pressure
    Autorzy:
    Yao, T.
    Wojtanowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/298828.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    well integrity
    gas migration
    sustained casing pressure
    environmental risk
    Opis:
    Sustained casing pressure (SCP) represents a major issue because of its large scale occurrence and risks to health, safety, and the environment. Present regulatory assessment of sustained casing pressure is mostly qualitative with implicit risk formulation. It currently holds that wells with casing head pressure that can be bled-down to zero and is followed by slow 24-hour pressure buildup are below acceptable level of risk. This study introduces new quantitative metrics of well integrity loss risk - the instant cement sheath leak rate of 15 scf/min (barrier integrity), and the total annual environmental gas discharge of 6 tons of volatile organic compounds (VOC) per year. Field data from 19 wells reportedly affected by sustained casing pressure (SCP) are examined with a SCP testing software to assess whether or not wells with pressure that is able to bleed to zero would meet the proposed criteria. Using modeling and software tools developed by Xu and Wojtanowicz (2001) and Kinik and Wojtanowicz (2011), it is determined that three of the 19 wells (15.8) examined would fail the instant leak rate criterion. On the total discharge criterion, assuming the wells' annuli above the cement top filled out with seawater, it was also found, again, that 15.8 percent of the wells would fail the total environmental discharge criterion. Moreover, for the worst-case scenario of absolute open gas flow (empty annulus above the cement top), five of 19 wells (26.3) would fail the criterion. It is shown that - statistically, the bleed-down of casing pressure to zero gives a 90-percent confidence of the well passing the proposed criteria. Furthermore, no clear correlation was observed between pressure build-up and the barrier integrity or the environmental gas discharge criteria, thus questioning the 24-hour pressure buildup relevance as a risk indicator.
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 2; 639-654
    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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