Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (2): 627-634.doi: 10.13278/j.cnki.jjuese.20190316

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Analysis of Gas-Water Distribution and Water Production Control Factors in the East 2nd Area of Sulige Gas Field

Lin Mengxiong1, Liu Li2, Zhang Yiguo1, Chang Sen1, Xia Yang1   

  1. 1. Institute of Geology, No.5 Gas Production Plant, Changqing Oilfield Company, Xi'an 710000, China;
    2. Oil and Gas Resources Strategic Research Center, Ministry of Natural Resources, Beijing 100034, China
  • Received:2019-12-27 Online:2020-03-26 Published:2020-03-31
  • Supported by:
    Supported by National Science and Technology Major Project During the "13th Five-Year Plan" Period(2016ZX05004-006)

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Abstract: Aiming at the gas and water distribution and control factors needed for the efficient and sustainable development of low-porosity and low-permeability tight sandstone gas reservoirs, a comprehensive analysis of gas reservoir geological and production dynamic data was conducted in the East 2nd area of Sulige gas field. The results show that:1) the geological structure and the intensity of hydrocarbon generation control the macro-pattern of gas-water distribution in this area, and the gas reservoirs are developed on the low-lying part or micro-structure near the source rocks; 2) the physical parameters of reservoir play a key role in controlling the gas-water distribution; 3) the sand bodies with good physical properties have less capillary resistance, and natural gas is more likely to displace the formation water in sandstone reservoirs to form gas layers. The porosity of the gas layers in the study area is between 7% and 14%, and the permeability is between 0.50×10-3 and 2.00×10-3 μm2. The factors such as mudstone barriers complicate the gas-water distribution. The thickness increase of the mudstone barrier in the first Member of Shanxi Formation leads to the decrease of daily gas production but increase water production in the 8th Member of Shihezi Formation in the corresponding area. It is concluded that the production capacity of tight sandstone gas reservoirs is greatly affected by the development method. The pressure sensitive and velocity sensitive effects should be considered for a reasonable production allocation of gas reservoirs:the longer the production time is, the greater the production pressure difference is, the faster the gas well water production rate, and the larger the water production volume. The horizontal well development can increase the drainage area of gas wells, and it can, in turn, reduce the production pressure difference and the water-gas ratio, increase productivity, and extend the water-free or low-water gas recovery period and recovery ratio.

Key words: Sulige gas field, gas-water distribution, porosity, permeability, control factors, development method, recovery ratio

CLC Number: 

  • P618.13
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