西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (2): 141-148.DOI: 10.11885/j.issn.1674-5086.2019.05.29.04

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Optimization Design of Well Pattern in Heterogeneous Gas Storage

LIU Pengcheng1,2, YU Haojie1,2, AN Hongyan1,2, XU Wen1,2, ZHU Yajun1,2   

  1. 1. Exploration and Development Reserch Institute of PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low-permeability Oil & Gas Fields, Xi'an, Shaanxi 710018, China
  • Received:2019-05-29 Online:2020-04-10 Published:2020-04-10
  • Supported by:
     

Abstract: Gas storage well pattern design is very different from conventional gas field well pattern design. Under the same investment conditions, the conventional gas field well network design pursues the maximum recovery of gas field, while gas storage well network design pursues maximum working gas volume in one gas production cycle (3~4 months). Because of the great different of gas production capacity in different areas, one set of well pattern is not suitable for gas storage wells built on heterogeneous reservoirs. Taking Su A gas storage as an example, the area for gas storage network is divided into areas of high permeability and low permeability. We analyze the production capacity of gas wells in the two areas and the regional working gas volume variation with the number of gas wells. And we propose a non-uniform well pattern based on the maximization of working gas volume, and determine the reasonable well pattern density in high permeability zone and low permeability zone. When there are 11 wells in the gas storage, with non-uniform well pattern, the well pattern density in the high-permeability area is 1.7 wells/km2, and that in the low-permeability area is 0.38 wells/km2. The working gas volume of gas storage will be increased by 0.99×108 m3 than that of uniform well pattern.

 

Key words: heterogeneous gas reservoir, gas storage, uniform well pattern, non-uniform well pattern, working gas volume

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