Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (6): 122-126.doi: 10.3969/j.issn.1673-8926.2013.06.023

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A productivity model of vertically fractured well with varying conductivity for low permeability reservoirs

XIONG Jian1， ZENG Shan2， WANG Shaoping2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China； 2. No. 2 Oil Production Plant， PetroChina Changqing Oilfield Company， Qingyang 745100， China
  • Online:2013-11-26 Published:2013-11-26

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Abstract:

In view of that the flow conductivity of vertical fracture varies at different place after fracturing in the low permeability reservoirs, based on the change of fluid flowrule after fracturing, this paper established a productivitymodel of vertically fractured well with varying conductivity for lowpermeability reservoirs, considering the influence of starting pressure gradient, and analyzed the influences of different factors on productivity. The result shows that the influence of the attenuation coefficient on the oil well productivity increases with the enhancement of producing pressure drop, and decreases with the increase of crack length. When the fracture conductivity is small, the longer the crack length is, the bigger the attenuation coefficient is, and the less the oil well productivity is. On the contrary, the shorter the crack length is, the smaller the attenuation coefficient is, and the more the oil well productivity is.

Key words:  reservoir sensitivity, Toutunhe Formation, Middle Jurassic, Fudong slope

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