西南石油大学学报(自然科学版)

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Experiment of Microscopic Displacement of Gas and Water in Loose
Sandstone Gas Reservoir of Sebei

Chen Zhaohui1, Xie Yiting2, Deng Yong3   

  1. 1. School of Petroleum Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. State Key Laboratory of Oil and Gas Reservoir Geology & Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    3. SINOPEC Southwest Branch,Chengdu,Sichuan 610081,China
  • Online:2013-08-01 Published:2013-08-01

Abstract:

By the slice model and microscopic visualization technology,we simulated the formation of irreducible water in the
course of reservoir accumulation and the seepage mechanics of water production in the course of reservoir development with
experiment about microscopic displacement. The results showed by that:in the first,when the gas displacement is complete,
there is only irreducible water in the reservoir,and it will be transformed to secondary mobile water due to the reservoir pressure
reduction,and then it will be produced by displacement pressure difference but the quantity is less and there is hardly any
influence to the production of gas well;and then,when the gas displacement is not complete,the original mobile water will
be gradually produced after opening well,and it will generate serious influence on gas well production because of higher water
quantity;finally,the ultimate recovery ratio of Sebei gas field is estimated to be 64.00%,and we got the result from the initial
gas saturation obtained by gas displacing water experiment and the residual gas saturation by water displacing experiment. The
analysis of the effect of secondary mobile water and original mobile water on the development of gas reservoir,and of the
productive year and the ultimate recovery rate is hoped to provide reference for gas field development.

Key words: loose sandstone, microscopic visualization, displacement experiment, irreducible water, mobile water