Xinjiang Petroleum Geology

Xinjiang Petroleum Geology ›› 2009, Vol. 30 ›› Issue (6): 738-741.

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Analysis of Pressure Behavior of Well in Double-Porosity Reservoir with Finite Conductivity Vertical Fractures

CAI Ming-jin1, JIA Yong-lu1, CAI Sheng-quan2, ZHAO Bin2, FANG Jun3   

  1. 1. Institute of Petroleum Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. No.1 Production Plant,Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;
    3. Borehole Operation Engineering Company, Jilin Oilfield Company, PetroChina, Songyuan, Jilin 138001, China
  • Received:2009-03-10 Revised:2009-05-18 Published:2020-10-23

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Abstract: The well with finite conductivity vertical fractures would be formed after fracturing in double-porosity reservoir. Based on the Warren-Root model, the mathematical model for well with finite conductivity vertical fractures in double-porosity reservoir is developed using mass conservation law and elliptical flow method. The equation for bottom-hole pressure of vertical fractured well is obtained using Laplace transform, and the main affecting factors to the bottom-hole pressure behavior are analyzed. The results indicates that wellbore storage factor, skin factor and fracture conductivity are the most obvious affecting factors to it, and the time of interporosity flow from matrix to natural fracture is affected strikingly by wellbore storage factor. Also, the buildup test result from a vertical fractured well in carbonate reservoir is explained.

Key words: double-porosity, fracturing, vertical fracture, conductivity

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