Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (5): 124-128.doi: 10.3969/j.issn.1673-8926.2012.05.024

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Areal sweep efficiency of staggered well pattern of horizontal wells in low permeability reservoirs

ZHOU Ying1， TANGHai1， LU Dongliang1， ZHAOChunming2， LIAOXingwu2   

  1. 1. College of Petroleum Engineering， Southwest University of Petroleum， Chengdu 610500， China； 2. Research Institute of Exploration and Development， Tianjin Branch， CNOOC， Tanggu 300452， China
  • Online:2012-10-20 Published:2012-10-20

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Abstract:

Bymeans of characteristics of the staggered well water flooding exploitation in lowpermeability reservoirs, and on the basis of streamtubemodel and the Beckley-Leverett equation, the areal sweep efficiency formula and water breakthrough time formula considering start-up pressure gradient were derived for the staggered well pattern of horizontal wells. This theory solved the problems of theoretical calculation of areal sweep efficiency and water breakthrough time on the state of non-Darcy flow. The case study shows that the theoretically calculated results are very close to the reservoir. So this method is scientific and reasonable, and it can be used to quantitatively characterize the reservoir produced degree in staggered well pattern and provide theory basis for development and evaluation of lowpermeability reservoirs.

Key words: polymer flooding, operation cost, prediction method, gray prediction, principal component analysis

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