頁巖儲層多段壓裂后裂縫自然閉合壓力遞減規(guī)律
[Abstract]:Shale reservoir has the characteristics of low porosity and ultra-low permeability. At present, it is the key technology to develop shale and other unconventional reservoirs efficiently by multi-stage fracturing in horizontal wells. However, the flow characteristics of fluid in horizontal wells with multiple fractures closing at the same time are obviously different from those of single fractures. As a result, the pressure decline analysis method, which is mature for fracturing vertical wells at present, can not be directly applied to the pressure decline analysis of shale reservoir after multistage fracturing. Considering the stress-sensitive effect caused by the natural closure of fractures and the geological characteristics of the development of natural micro-fractures in shale reservoir, the filtration loss of fracturing fluid in shale reservoir is analyzed by using a dual porous medium percolation model. Combined with the pseudo-three-dimensional fracture model based on elasto-plastic mechanics theory, the fracture volume conservation equation is established, and the pressure decline model is obtained under the condition of natural closure of fractures in shut-in stage after multistage fracturing in shale reservoirs. The results show that the matrix porosity, fracture permeability and stress sensitivity coefficient are the main factors that affect the pressure decline during shut-in.
【作者單位】: 西南石油大學(xué)油氣藏地質(zhì)及開發(fā)工程國家重點實驗室;
【基金】:國家自然科學(xué)基金重大項目“頁巖地層動態(tài)隨機裂縫控制機理與無水壓裂理論”(51490653) 國家“973”計劃“中國南方海相頁巖氣高效開發(fā)的基礎(chǔ)研究”(2013CB228004)
【分類號】:TE377
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