發(fā)布時間：2018-03-31 19:15

  本文選題：FEMDEM　切入點：FDEM-flow　出處：《巖土力學》2017年06期

【摘要】：可考慮巖石本身滲透性的FDEM-flow方法充分利用原FEMDEM中節(jié)理單元和三角形單元獨特的拓撲連接關系,將節(jié)理單元作為流體流動的天然通道,基于立方定律來表征流體在巖石本身及裂隙中的流動,而巖石本身滲透性則通過標定合適節(jié)理單元張開度來表征。用一個含解析解自由面穩(wěn)態(tài)滲流算例初步驗證了本文滲流算法及標定巖石本身滲透率方法的正確性。最后計算了一個水力壓裂算例,驗證了該FDEM-flow方法可同時考慮巖石本身的滲透性和裂隙的滲透性,用簡單的純裂隙滲流完成了對復雜問題的處理。研究結果表明:修改后的FDEM-flow方法能夠很好地再現(xiàn)壓裂過程中流體壓力的分布及裂隙的擴展,可簡潔地求解水力壓裂這一復雜力學的問題,適用范圍更廣。為模擬頁巖氣開采、干熱巖地熱獲取中的水力壓裂問題提供新的求解工具。
[Abstract]:The FDEM-flow method, which considers the permeability of rock itself, makes full use of the unique topological connection between the joint element and the triangular element in the original FEMDEM, and takes the joint element as the natural channel for fluid flow. Based on the cubic law to characterize the flow of fluid in the rock itself and in fractures, The permeability of the rock itself is characterized by the proper opening degree of the joint unit, and the correctness of the proposed seepage algorithm and the method of calibrating the permeability of the rock is preliminarily verified by an example of steady seepage with an analytical solution. Finally, a hydraulic fracturing example is calculated. It is verified that the FDEM-flow method can consider both the permeability of rock itself and the permeability of fractures. Simple pure fracture seepage is used to deal with complex problems. The results show that the modified FDEM-flow method can well reproduce the distribution of fluid pressure and crack propagation during fracturing. The complex mechanics problem of hydraulic fracturing can be solved succinctly, and the application scope is wider, which provides a new solution tool for the hydraulic fracturing problem in the process of simulating shale gas production and geothermic acquisition of dry hot rock.
【作者單位】： 中國地質大學工程學院;
【基金】：國家自然科學基金青年項目(No.11602006) 北京市自然科學基金青年項目(No.1174012) 朝陽區(qū)博士后科研活動經費資助(No.2016ZZ-01-08)~~
【分類號】：TV223

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本文編號：1692079