Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 152-160.doi: 10.12108/yxyqc.20200117

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Pressure transient analysis for separate-layer acid fracturing well of tidal flat fractured carbonate reservoirs in western Sichuan Basin

SHI Wenyang1, YAO Yuedong1, CHENG Shiqing1, GU Shaohua2, SHI Zhiliang2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Research Institute of Exploration&Production, SINOPEC, Beijing 100083, China
  • Received:2019-06-27 Revised:2019-08-26 Online:2020-01-21 Published:2019-11-22

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Abstract: In order to reflect the complex flow characteristics of reservoir after separate-layer acid fracturing, aiming at tidal flat fractured carbonate reservoir,a pressure transient analysis model considering crossflow for separate-layer acid fracturing wells in fractured carbonate reservoir was established,and the bottom-hole pressure was obtained by Laplace transformation and numerical inversion. According to the type curves of pressure and its derivative,the flow stages were identified and divided,and the effects of interlayer physical property differences, crossflow and separate-layer modification differences on pressure response were analyzed. The results show that there are seven flow stages of tidal flat fractured carbonate reservoir in separate-layer acid fracturing,and the type curve has the flow characteristics of composite model and layered crossflow model. The greater the difference of interlayer properties,the more obvious the crossflow and concave on the pressure derivative curve are. The separate-layer acid fracturing degree and scope both affect the time and scale of transition flow occurrence. The higher the mobility ratio of high-permeability layer is,the more obvious the transition flow stage is,and the pressure derivative value is the half of the mobility ratio of high-permeability layer during outer radial flow stage. The model can provide a method for quickly identifying the acid fracturing degree of high-permeability layer, which can be used to evaluate the acid fracturing effect of multi-layer fractured carbonate reservoir and determine the degree of acid fracturing modification of individual layer.

Key words: fractured carbonate reservoir, crossflow, separate-layer acid fracturing, pressure transient analysis, Leikoupo Formation, tidal flat facies in western Sichuan Basin

CLC Number: 

  • TE357.2
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