Effect of Pore Pressure Variation on Borehole Stability of Drilling in Sandstone Reservoir

Yu Wei Li; Jia Liu; Chao Yang Hu; Shuang Li; Yu Liu

doi:10.4028/www.scientific.net/AMR.577.163

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 577Effect of Pore Pressure Variation on Borehole...

Effect of Pore Pressure Variation on Borehole Stability of Drilling in Sandstone Reservoir

Abstract:

Considering pore pressure variation of sidewall rock, which is caused by drilling fluid filtering, the porosity variation model of sidewall rock in sandstone reservoir and effective stress factor variation model are established, and according to relationship between pore pressure and total volume strain of sandstone, the calculation model of safe window of drilling fluid density on sandstone reservoir, with which considered variation of porosity and effective stress factor are finally established. Applying the calculation of this model shows that: with increased function of drilling fluid filtering, which is as increased as pore pressure of sidewall rock, caving pressure that ensures well hole stability is increased, fracturing pressure is decreased, safe window of drilling fluid is narrowing, and that is against of safety drilling.

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Periodical:

Advanced Materials Research (Volume 577)

Pages:

163-166

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.577.163

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Online since:

October 2012

Authors:

Yu Wei Li, Jia Liu, Chao Yang Hu, Shuang Li, Yu Liu

Keywords:

Caving Pressure, Effective Stress Factor, Fracturing Pressure, Porosity

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