西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (1): 147-153.

• 石油与天然气工程 • Previous Articles     Next Articles

Study of Areal Sweep Efficiency for Invert 9-Spot Pattern of LowPermeability Reservoir

Lü Dongliang1, Tang Hai1, Guo Fenzhuan1，2, Cao Feng3, Duan Chunlin4   

  1. 1. School of Petroleum Engineering，Southwest Petroleum University，Chengdu，Sichuan 610500，China2. Tubular Goods Research，CNPC，Xi’an，Shaanxi 710065，China3. Great Wall drilling engineering Co.，LTD，CNPC，Panjin，Liaoning 124107，China4. The Great Wall Drilling Engineering Branch，CNPC，Panjin，Liaoning 124107，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-02-01 Published:2012-02-01

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Abstract: Based on the characteristics of water flooding exploitation in low-permeability reservoir and the stream tube model，
and by taking the start-up pressure gradient into consideration，we establish the areal sweep efficiency formula and water
breakthrough time formula. The formula help solve the theoretical problem of the calculation of areal sweep efficiency of lowspeed
non-Darcy seepage flow，which is different from Darcy seepage flow. The results show that the water breakthrough time
and areal sweep efficiency of invert 9-spot pattern in low-permeability reservoir are different in borderline well and corner well.
It is necessary to adopt a different working system to adjust to the uniformity degree of water flooding in borderline well and
corner well. This research provides theory basis for development and evaluation of low-permeability reservoir.

Key words: threshold pressure gradient, low permeability reservoir, invert 9-spot pattern, areal sweep efficiency, water breakthroughtime

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