Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 161-168.doi: 10.12108/yxyqc.20190519

• PETROLEUM ENGINEERING • Previous Articles    

Pressure transient of fractured horizontal well with complex fracture distribution in composite reservoir

XU Youjie1, LIU Qiguo1, WANG Rui2, LIU Yicheng3   

  1. 1. School of Oil & Gas Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. Petroleum Industry Press, Beijing 100000, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610000, China
  • Received:2018-12-27 Revised:2019-04-08 Online:2019-09-21 Published:2019-09-16

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Abstract: Hydraulic fracturing technology is a vital method to increase oil field production and improve reservoir properties near wellbore. In the actual process of multi-stage fracturing volume modification,complex fracture network volume formed near wellbore due to complex formation conditions. Therefore,it is necessary to strengthen the study of volume fracturing modification test model of horizontal well. Based on the seepage characteristics of complex fracture distribution for multi-stage fractured well,a well-test mathematic model of radial composite multi-stage fractured well was established. Wellbore pressure was obtained by coupling reservoir and hydraulic fracture in Laplace domain,and the impact of wellbore storage and skin factor were considered by employing Duhamel principle. Applying Stehfest numerical inversion algorithm,wellbore pressure in real time domain can be calculated and pressure response log-log curve were plotted,and flow regimes were identified by characteristics of pressure-derivative curve. The correctness of this method was proved by model verification. The effects of fracture asymmetry factor,angle between fracture and wellbore,fracture distribution,radius of inner region and mobility ratio on characteristic curves were analyzed. The results show that the fractures of asymmetric staggered distribution are helpful to increase the control area of fractures,thereby reducing the pressure drop loss of fluid flowing into the wellbore,and larger inner radius leads to smaller pressure in log-log plot. This model can provide theoretical basis for the well-test interpretation and fracturing design of complex fracture formed by multistage fractured horizontal well.

Key words: multi-stage fractured horizontal well, complex fracture distribution, transient pressure, fracture asymmetry, composite reservoir

CLC Number: 

  • TE33+1.1
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