J4 ›› 2009, Vol. 39 ›› Issue (3): 503-506.

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Study and Application of Synthetical Pressure-fracture Technical on Low Pressure and Tight Gas Reservoir

QIN Yu-ying1|CHEN Fu-hu1|WANG Fu-ping2   

  1. 1.Exploration and Development Institute, North-China Branch Company, SINOPEC|Zhengzhou 450006,China;2.College of Applying Technology, Jilin University, Changchun 130022, China
  • Received:2008-12-04 Online:2009-05-26 Published:2009-05-26

Abstract:

The Daniudi gas field belongs to a reservoir of lower pressure and tight gas with a low pressure, a strong heterogeneity, a small diameter of pore and throat, a high capillary pressure, a character of multi-zone superimposed and varies gap distance between zones, which results in difficulty in reservoir protection and fracturing. A method of low damage fracture fluid with liquid N2 is adopted, which can decrease the reservoir damage and protect reservoir. Large-scale fracturing can prolong fracture length, enlarge drainage area and increase gas rate per layer. The gas production increased from 200 m3/d to 7.23×104 m3/d. Fracture operation time was reduced nearly 67%, and the cost was reduced 20.69% after separated fracturing without pulling string realized balance stimulation for multi-layer superimposed.

Key words: Daniudi gas field, low permeability, gas reservoir, multi-layer superimposed horizon, synthesical pressure-fracture

CLC Number: 

  • P634.5
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