Special Oil & Gas Reservoirs >

2022 , Vol. 29 >Issue 1: 141 - 146

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.01.021

Reservoir Engineering

On Factors Influencing Fracture Damage in Tight Gas Reservoirs, Linxing Block

  • Yu Cuipei ,
  • Zhang Binhai ,
  • Li Zihan ,
  • Huang Jing ,
  • Dong Zibiao ,
  • Yue Qiansheng
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  • 1. Yangtze University, Jingzhou, Hubei 434023, China;
    2. Beijing Research Center, CNOOC (China) Co., Ltd., Beijing 100010, China

Received date: 2021-05-31

  Revised date: 2021-11-15

  Online published: 2023-01-10

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Abstract

In order to identify the factors influencing the fracturing damage in tight gas reservoirs, Linxing block, laboratory experiments were performed with core permeability damage rate as an evaluation index to analyze the damage of reservoir sensitivity, water block effect, guar gum fracturing fluid residue after gel breaking and residue content to the reservoirs. The results showed that the reservoirs were moderately to weakly water-sensitive, and weakly to moderately weakly acid-sensitive and alkali-sensitive; the reservoir water block index was 85% to 100%, and the damage was strong to extremely strong; when single ammonium persulfate is used as gel breaker, the gel breaking viscosity was high at a temperature of lower than 30 ℃ and the damage to reservoirs was strong; the damage rate of fracturing fluid residue to reservoir permeability was low. The extent of damage to Linxing fractured tight gas reservoir in descending order was water block damage, fracturing fluid residue damage after gel breaking, reservoir sensitivity damage, and fracturing fluid residue damage. This study plays a guiding role in the selection of fracturing fluid systems and reservoir protection measures for Linxing tight gas reservoirs.

Key words： tight sandstone gas; guar gum fracturing fluid; reservoir damage; water block; gel breaking; Linxing Block

Cite this article

Yu Cuipei , Zhang Binhai , Li Zihan , Huang Jing , Dong Zibiao , Yue Qiansheng . On Factors Influencing Fracture Damage in Tight Gas Reservoirs, Linxing Block[J]. Special Oil & Gas Reservoirs, 2022 , 29(1) : 141 -146 . DOI: 10.3969/j.issn.1006-6535.2022.01.021

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