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Crucial effect of system compliance on the maximum stress estimation in the hydrofracturing method: Theoretical considerations and field-test verification

Earth, Planets and Space volume 58, pages 963–971 (2006)Cite this article

Abstract

Why do the currently available data sets from field hydrofracturing tests indicate that the measured re-opening pressure lies close to the shut-in pressure far more often than can reasonably be expected? In order to explain such a strange phenomenon, it is necessary to take into consideration two additional factors, those of (1) a residual aperture of fracture and (2) hydraulic compliance of the test equipment, both of which are ignored in the conventional theory of hydraulic fracturing. The residual aperture causes pressure penetration into the fracture prior to opening, and its effect is to reduce the re-opening pressure by a factor of two from the value expected when the conventional theory is used. The conventional theory implies that the fracture always begins to open at a borehole pressure less than the shut-in pressure. However, due to the effect of large hydraulic compliance, the reopening pressure measured in the conventional manner becomes larger than the true reopening pressure and approaches the shut-in pressure. Contrary to this, the reopening pressure measured using the test equipment with sufficiently small compliance represents a good estimate of the true reopening pressure. This pressure is related to the maximum horizontal stress SH, and its measured value allows us to estimate the value of SH.

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Authors and Affiliations

  1. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    Takatoshi Ito & Akira Igarashi

  2. Geotechnos Co. Ltd., 5-10-5, Shinbashi, Minato-ku, Tokyo, 105-0004, Japan

    Harumi Kato

  3. Center for Deep Earth Exploration, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawaku, Yokohama, Kanagawa, 236-0001, Japan

    Hisao Ito

  4. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

    Osam Sano

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  1. Takatoshi Ito
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  2. Akira Igarashi
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  3. Harumi Kato
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  4. Hisao Ito
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Correspondence to Takatoshi Ito.

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Ito, T., Igarashi, A., Kato, H. et al. Crucial effect of system compliance on the maximum stress estimation in the hydrofracturing method: Theoretical considerations and field-test verification. Earth Planet Sp 58, 963–971 (2006). https://doi.org/10.1186/BF03352601

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  • DOI: https://doi.org/10.1186/BF03352601

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