Lithologic Reservoirs ›› 2009, Vol. 21 ›› Issue (4): 96-98.doi: 10.3969/j.issn.1673-8926.2009.04.019

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Influence factor of stress-sensitivity on gas well abandoment pressure and recovery ratio in low permeability reservoirs

FU Chunmei1，TANG Hai1，ZOU Yifeng1，LV Dongliang1，FU Chunyan2   

  1. 1. Southwest Petroleum University， Chengdu 610500， China； 2. Guangya Polymer Co. Ltd. Sichuan， Chengdu 610500， China
  • Online:2009-12-16 Published:2009-12-16

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Abstract:

Tight and lowpermeability reservoirs have obvious stress-sensitivity phenomenon. The relationship between permeability ratio and effective stress is established by the stress-sensitivity experiment of core and the research on the rules of core permeability changing with effective stress. Effective permeability reduces with the increasing of effective pressure .The inconvertible permeability damages reach to 0.55％～24％ and the average is 8.1％.The pressure equation considering stress-sensitivity of gas well can be given by the influence of stress-sensitivity on abandonment pressure. And then the influence of stress-sensitivity on recovery ratio are studied referring to a simple equation compution of recovery ratio.

Key words: high resolution sequence stratigraphy, base level cycle, lithofacies and paleogeography, upper Ganchaigou Formation, Qaidam Basin

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