Innovative concept of hydrofracturing for deep stress measurement

T. Ito, H. Kato, H. Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

For the effective measurement of the reopening pressure in hydraulic fracturing, it is necessary to use the testing equipment with sufficiently small compliance. If not, there is no way to estimate the maximum stress in a plane perpendicular to a borehole, i.e. the maximum horizontal stress assuming a vertical borehole, from the reopening pressure. This limitation makes it difficult to apply the hydraulic fracturing for the measurement of the maximum stress, because the compliance of conventional equipments is generally so large. Taking account of this situation, we propose a new strategy which allows us to do the in-situ tests of hydraulic fracturing for stress measurement at depths more than 1 km. The system consists of two components which are (a) the compact drilling tool with a built-in mudmotor and (b) the packer tool with a built-in pump. Each of them is conveyed in drill pipe on wireline. The compact drilling tool is used to drill an additional hole with 47 mm (AQ size) in diameter and 2-3 m in length at the bottom of an original borehole, and the hydraulic fracturing is carried out in the drilled hole by using the small packer tool.

Original languageEnglish
Title of host publicationProceedings of the International Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application
Pages53-60
Number of pages8
Publication statusPublished - 2006 Dec 1
EventInternational Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application - Trondheim, Norway
Duration: 2006 Jun 192006 Jun 21

Publication series

NameProceedings of the International Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application

Other

OtherInternational Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application
CountryNorway
CityTrondheim
Period06/6/1906/6/21

ASJC Scopus subject areas

  • Geophysics

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  • Cite this

    Ito, T., Kato, H., & Tanaka, H. (2006). Innovative concept of hydrofracturing for deep stress measurement. In Proceedings of the International Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application (pp. 53-60). (Proceedings of the International Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application).