Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (5): 162-168.doi: 10.3969/j.issn.1673-8926.2017.05.020

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Microorganism preparation and application evaluation on microbial enhanced high-pour point oil recovery in Liaohe Oilfield

WANG Xiaotong1, XIANG Longbin2, ZHANG Yixin3   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
    3. Missouri University of Science and Technology at Rolla, Rolla 65401, Missouri, U.S.A
  • Received:2016-12-21 Revised:2017-02-15 Online:2017-09-21 Published:2017-09-21

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Abstract: The high pour-point oil is characterized by high proportion of wax,high freezing point and low fluidity, which make it difficult for development. To solve this problem,one strain of P.aeruginosa and two strains of Geobacillus were selected for microbial enhance high-pour point oil recovery research and characteristics assessment through four components analysis and the saturated hydrocarbon GC spectrum analysis. The results show that four components of oil selectively degrade by the strains:degradation rate is 23.0%-42.3%,meaning while the long carbon chain in the oil is shortened,the value of w(nC21-)/w(nC22+) and w(nC21 + nC22)/w(nC28 + nC29) increased by 0.33-0.57. The strains'capability of producing bio-surfactant was evaluated:the surface tension of P.aeruginosa fermentation broth decreases from 72.21 mN/m to 26.81 mN/m. The two strains of Geobacillus emulsify high-pour point oil with an emulsification index of 70.6% and 82.3% respectively. Based on characteristics of these three microorganisms,a novel compound microorganism preparation which is compatible with indigenous microorganisms was successfully designed. The oil viscosity decreases by 63.86% and the oil freezing point is lowered by 6℃ by this microbial preparation. Through water flooding simulation test,the preparation enhances high-pour point oil recovery by 6.46%-8.48% in the middle permeability(200 mD) and low permeability(50 mD). Afield test involved 6 wells was conducted in Liaohe Oilfield,which demonstrates the stability and high efficiency of this novel compound microorganism preparation in enhancing high freezing point oil recovery.

Key words: high-resolution sequence stratigraphy, base level, alluvial fan, Guantao Formation, Liaohe Depression

CLC Number: 

  • TE357.9
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