Analysis of stress sensitivity and its influence on oil productionfrom tight reservoirs

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This paper presents a study of the relationship betweenpermeability and effective stress in tight petroleum reservoirformations. Specifically, a quantitative method is developed to describethe correlation between permeability and effective stress, a method basedon the original in situ reservoir effective stress rather than ondecreased effective stress during development. The experimental resultsshow that the relationship between intrinsic permeability and effectivestress in reservoirs in general follows a quadratic polynomial functionalform, found to best capture how effective stress influences formationpermeability. In addition, this experimental study reveals that changesin formation permeability, caused by both elastic and plasticdeformation, are permanent and irreversible. Related pore-deformationtests using electronic ... continued below

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Lei, Qun; Xiong, Wei; Yuan, Cui & Wu, Yu-Shu August 28, 2007.

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This paper presents a study of the relationship betweenpermeability and effective stress in tight petroleum reservoirformations. Specifically, a quantitative method is developed to describethe correlation between permeability and effective stress, a method basedon the original in situ reservoir effective stress rather than ondecreased effective stress during development. The experimental resultsshow that the relationship between intrinsic permeability and effectivestress in reservoirs in general follows a quadratic polynomial functionalform, found to best capture how effective stress influences formationpermeability. In addition, this experimental study reveals that changesin formation permeability, caused by both elastic and plasticdeformation, are permanent and irreversible. Related pore-deformationtests using electronic microscope scanning and constant-rate mercuryinjection techniques show that while stress variation generally has smallimpact onrock porosity, the size and shape of pore throats have asignificant impact on permeability-stress sensitivity. Based on the testresults and theoretical analyses, we believe that there exists a cone ofpressure depression in the area near production within suchstress-sensitive tight reservoirs, leading to a low-permeability zone,and that well production will decrease under the influence of stresssensitivity.

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  • 2007 Society of Petroleum Engineers (SPE) EasternRegional Meeting, Lexington, KY, 17-19 October2007

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  • Report No.: LBNL--63410
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 929669
  • Archival Resource Key: ark:/67531/metadc900427

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Office of Scientific & Technical Information Technical Reports

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  • August 28, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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Lei, Qun; Xiong, Wei; Yuan, Cui & Wu, Yu-Shu. Analysis of stress sensitivity and its influence on oil productionfrom tight reservoirs, article, August 28, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc900427/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.