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Study on the Mechanism of Microbial Removal for Fracturing Fluid Residue in Formation

  • Lei Guanglun
  • Wang Zhihui
  • Ma Xin
  • Da Qian
  • Zhang Xin
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

Hydraulic fracturing is the necessary technology to develop unconventional oil and gas reservoirs such as low permeability reservoirs and ultra-low permeability reservoirs. However, during the fracturing process, the residue after gel breaking can seriously block the oil and gas seepage channel which is an important cause of formation damage. This paper intends to explore the mechanism of microbial removal of fracturing fluid residue by microbial reduction and decompression. In order to study the mechanism of the microbial removal for fracturing fluid residue, some experimental researches were carried on as the following: ① The microorganism was isolated from formation water which is able to utilize guar gum as a sole carbon source. ② The residue was collected, and biodegradation experiments were carried out. ③ The changes of residue quality and particle size during the biodegradation process were analyzed by macroscopic gravimetric method and microscopic laser particle size method to explain the mechanism of removal of formation damage. The results showed that: (1) With the increase of microbial biodegradation time, the degradation rate of fracturing fluid residue is up to 36.73%. It indicated that the microorganism used in this paper can use the guar residue as a sole carbon source for microbial growth and can reduce the total amount of fracturing fluid residue in the formation. (2) The particle size of fracturing fluid residue decreased with the increase of biodegradation time, and the median particle diameter decreases by more than 60%. The research results provide a theoretical basis for the removal of fracturing fluid residue by microorganisms.

Keywords

Low permeability Fracturing fluid residue Damage clogging Microbial biodegradation 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Lei Guanglun
    • 1
  • Wang Zhihui
    • 1
  • Ma Xin
    • 1
  • Da Qian
    • 1
  • Zhang Xin
    • 1
  1. 1.School of Petroleum EngineeringChina University of PetroleumQingdaoChina

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