English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 60696/93562 (65%)
造訪人次 : 1038551      線上人數 : 27
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/118856

    題名: Porothermoelastic Response and Damage Potential of Tripping Unconventional Cores from Six Different Shale Plays
    作者: Ali Taghichian;Hamid Hashemolhosseini;Musharraf Zaman, F.ASCE;Zon-Yee Yang
    關鍵詞: Unconventional reservoirs;Core retrieval;Core damage;Poroelasticity;Porothermoelastic response;Characteristic time;Tripping velocity
    日期: 2019
    上傳時間: 2020-07-06 12:10:36 (UTC+8)
    出版者: American Society of Civil Engineers
    摘要: Coring operations in the petroleum industry are generally performed to study geological, petrophysical, geomechanical, and drilling properties of reservoir formations and characteristics of reservoir fluids. Some of these studies need intact cores for performing mechanical tests or for measuring reservoir fluid properties. Therefore, retrieval of intact cores is crucial to coring jobs. During the coring operation and tripping a core out of a well, it experiences a sudden or gradual decrease in confining stress, pore pressure, and temperature (time-dependent boundary conditions) depending on the mud pressure, in situ stress, reservoir temperature, and reservoir pore pressure. Some porothermoelastic (PTE) properties of the retrieved core also change due to the change in reservoir conditions at or near the surface. Specifically, changes in the core properties depend on the in situ conditions, mud pressure, and the tripping velocity. These conditions or phenomena, which occur simultaneously, induce mechanical, poroelastic (PE), and thermal stresses in the core, which may cause failure. In this paper, the PTE behavior of unconventional tripping of cores is studied with the goal of identifying the most influential variables and the risk of core damage. First, the PTE and in situ properties of six different shale plays located in the US are collected from the literature. The Marcellus shale data are then used to identify the following three most important controlling factors and their effect on the core damage: use of PE and/or PTE approaches, use of constant or variable properties, and change in tripping velocity. Second, the gradual change in stress, pore pressure, and temperature during core tripping is examined in the Marcellus shale. Third, PTE behavior and damage potential of the selected six shale plays during tripping are investigated, and the results among these reservoirs are compared. Fourth, a comprehensive sensitivity analysis is performed for each of these shale plays via changing the input variables by selected percentages and observing the change in the effective stress field. Finally, some guidelines are presented, along with an optimization procedure for tripping velocity, for efficient coring operations. A commonly used software, FLAC3D, is used for all numerical analyses because of its capability and features of simulating coupled problems as a PTE medium with variable properties and time-dependent boundary conditions.
    關聯: International Journal of Geomechanics 19(1), 04018185(18 pages)
    DOI: 10.1061/(ASCE)GM.1943-5622.0001328
    顯示於類別:[土木工程學系暨研究所] 期刊論文


    檔案 描述 大小格式瀏覽次數



    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋