Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (1): 135-139.doi: 10.3969/j.issn.1673-8926.2017.01.018

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Optimization of reasonable production pressure difference of fractured horizontal well in low permeability tight reservoirs

DENG Xuefeng   

  1. Research Institute of Petroleum Engineering and Technology, Sinopec North China Branch Company, Zhengzhou 450000, China
  • Received:2016-08-18 Revised:2016-10-10 Online:2017-01-21 Published:2017-01-21

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Abstract: In order to establish effective numerical simulation method to calculate the reasonable production pressure difference of fractured horizontal well, the threshold pressure gradient and pressure-sensitive effect in tight and fractured reservoirs of Yanchang Formation in HH oilfield, Ordos Basin. The permeability was modified by introducing dynamic permeability theory and pressure- sensitive effect into numerical simulation calculation, since the theory could effectively simulate the characteristics of nonlinear flow in low permeability reservoirs. Therefore, a new method for productivity of fractured horizontal well in low permeability reservoir was established, which takes into consideration the effects of threshold pressure gradient together with pressure-sensitive effect on the productivity of fractured horizontal well. The results indicate that the calculation result by this new numerical simulation method accord well with field production characteristics of fractured horizontal well in low permeability reservoirs, and there are apparent effects of threshold pressure gradient and pressure-sensitive effect on productivity of fractured horizontal well. In addition, the range of reasonable production pressure difference of fractured horizontal well in HH oilfield was optimized.

Key words: tight sandstone, rock conductivity, grain conductivity, formation water conductivity, cementation index, permeability

CLC Number: 

  • TE348
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