Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
A hydraulic stress measurement system for deep borehole investigations
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-1998-0769
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik. FracSinus Rock Stress Measurement AB, Luleå.ORCID-id: 0000-0002-9333-4477
University of Strasbourg, School and Observatory of Earth Sciences, Strasbour.
University of Strasbourg, School and Observatory of Earth Sciences, Strasbourg.
2017 (Engelska)Ingår i: Geophysical Research Abstracts, ISSN 1029-7006, E-ISSN 1607-7962, Vol. 19Artikel i tidskrift, Meeting abstract (Refereegranskat) Published
Abstract [en]

Lulea University of Technology (LTU) is developing and building a wire-line system for hydraulic rock stress measurements, with funding from the Swedish Research Council and Lulea University of Technology. In this project, LTU is collaborating with University of Strasbourg and Geosigma AB. The stress state influences drilling and drillability, as well as rock mass stability and permeability. Therefore, knowledge about the state of in-situ stress (stress magnitudes, and orientations) and its spatial variation with depth is essential for many underground rock engineering projects, for example for underground storage of hazardous material (e.g. nuclear waste, carbon dioxide), deep geothermal exploration, and underground infrastructure (e.g. tunneling, hydropower dams). The system is designed to conduct hydraulic stress testing in slim boreholes. There are three types of test methods: (1) hydraulic fracturing, (2) sleeve fracturing and (3) hydraulic testing of pre-existing fractures. These are robust methods for determining in situ stresses from boreholes. Integration of the three methods allows determination of the three-dimensional stress tensor and its spatial variation with depth in a scientific unambiguously way. The stress system is composed of a downhole and a surface unit. The downhole unit consists of hydraulic fracturing equipment (straddle packers and downhole imaging tool) and their associated data acquisition systems. The testing system is state of the art in several aspects including: (1) Large depth range (3 km), (2) Ability to test three borehole dimensions (N=76 mm, H=96 mm, and P=122 mm), (3) Resistivity imager maps the orientation of tested fracture; (4) Highly stiff and resistive to corrosion downhole testing equipment; and (5) Very detailed control on the injection flow rate and cumulative volume is obtained by a hydraulic injection pump with variable piston rate, and a highly sensitive flow-meter. At EGU General Assembly 2017, we would like to present this new and unique stress measurement system and some initial test results from a 1200 m long borehole in crystalline rock

Ort, förlag, år, upplaga, sidor
European Geosciences Union (EGU), 2017. Vol. 19
Nationell ämneskategori
Geologi
Forskningsämne
Malmgeologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-67844OAI: oai:DiVA.org:ltu-67844DiVA, id: diva2:1187693
Konferens
European Geosciences Union general assembly 2017. Vienna, Austria, 23–28 April 2017
Tillgänglig från: 2018-03-05 Skapad: 2018-03-05 Senast uppdaterad: 2018-09-25Bibliografiskt granskad

Open Access i DiVA

fulltext(35 kB)46 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 35 kBChecksumma SHA-512
1122c5fd490fe094356f3aa0a2ea25b694db4bf6a7e15d54e3047c0cf7ee3e67dbfc468f361ca330be6a1e6b96a2bddf96d568c79dad9590079e1ba1b0f7b95c
Typ fulltextMimetyp application/pdf

Sök vidare i DiVA

Av författaren/redaktören
Ask, MariaAsk, Daniel
Av organisationen
Geovetenskap och miljöteknik
I samma tidskrift
Geophysical Research Abstracts
Geologi

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 46 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 203 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf