Scale effects in hollow cylinder tests




<正>Two types of tests conducted routinely on hollow cylinders are splitting tests and collapse tests.In the former case,a hollow cylindrical sample is pressurised internally until a fracture is formed in the axial plane of the sample at a fracture initiation pressure.This form of test is used in connection with hydraulic fracturing to directly measure fracture strength.In the latter case,a hollow cylindrical sample is pressurised externally until failure occurs at the internal wall of the sample,either by a shear or tensile mechanism,eventually leading to total collapse.This form of test is used in relation to problems of wellbore stability and sand production associated with the petroleum industry.The results of two laboratory experimental programs exploring some respective aspects of scale effect for both of the above test procedures are discussed.The prospects for extrapolating laboratory scale data to the field are explored,based on both empirical fits to data and theoretical models.


Figure;Scale effects in hollow cylinder tests;Hole;


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Springer Journals Database

Total: 13 articles

  • [1] Y.H. Hatzor;;V. Palchik, A microstructure-based failure criterion for Aminadav dolomites, International Journal of Rock Mechanics and Mining Sciences,
  • [2] Enever,J.R, Case studies of hydraulic fractnre stress measurement in Australia, Comprehensive Rock Engineering,Vol3,Rock Testing and Site Characterisation,
  • [3] Ewy,R.T;Ray,P;Bovber,C.A;Norman,P.D;Goodman.H.E, Openhole stability and sanding preditions by 3D extrapolation from hole collapse tests, SPE paper 56592,
  • [4] Koojiman,A.P;van den Elzen,MG.A.;Veeken,C.A.M, Hollow cylinder collapse:measurement of deformation and failure in an x-ray scanner,observation of size effect, Proc. 32nd US Rock Mechanics Sympsiurn,Rock Mchanics as a Multidisiplinary Science,


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