本文選題：FEMDEM　切入點(diǎn)：FDEM-flow　出處：《巖土力學(xué)》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(dú)特的拓?fù)溥B接關(guān)系,將節(jié)理單元作為流體流動(dòng)的天然通道,基于立方定律來(lái)表征流體在巖石本身及裂隙中的流動(dòng),而巖石本身滲透性則通過(guò)標(biāo)定合適節(jié)理單元張開(kāi)度來(lái)表征。用一個(gè)含解析解自由面穩(wěn)態(tài)滲流算例初步驗(yàn)證了本文滲流算法及標(biāo)定巖石本身滲透率方法的正確性。最后計(jì)算了一個(gè)水力壓裂算例,驗(yàn)證了該FDEM-flow方法可同時(shí)考慮巖石本身的滲透性和裂隙的滲透性,用簡(jiǎn)單的純裂隙滲流完成了對(duì)復(fù)雜問(wèn)題的處理。研究結(jié)果表明:修改后的FDEM-flow方法能夠很好地再現(xiàn)壓裂過(guò)程中流體壓力的分布及裂隙的擴(kuò)展,可簡(jiǎn)潔地求解水力壓裂這一復(fù)雜力學(xué)的問(wèn)題,適用范圍更廣。為模擬頁(yè)巖氣開(kāi)采、干熱巖地?zé)岖@取中的水力壓裂問(wèn)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(guó)地質(zhì)大學(xué)工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金青年項(xiàng)目(No.11602006) 北京市自然科學(xué)基金青年項(xiàng)目(No.1174012) 朝陽(yáng)區(qū)博士后科研活動(dòng)經(jīng)費(fèi)資助(No.2016ZZ-01-08)~~
【分類號(hào)】：TV223

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