Q4\ Match the items from list A with the suitable ones from list B:ABexceeds the tensile strength ofUsing insufficient mud weight in over-pressured formations1aformationsA special feature for the Mohr-Coulomb criterion,2bthe ratio between the uniaxialcompressive strength and the tensilestrength is (8).In isotropic horizontal stress state, theprincipal stresses at the verticalborehole wall are:3mechanical (in-situ stresses), chemical,thermal, and hydraulic effects.If the redistributed stress state in the dvicinity of the wellbore exceeds therock strength4pure hydrostatic loading.Tensile failure occurs when the stressOr: Radial stress, Oe: Tangential stress,eimposed by drilling mud02: Axial stressIn a principal stress plot of the Griffithcriterion,6.over pressured shales.7The local stress distribution around a gwellbore are controlled bythen instability may result8.Pore collapse may occur underhOr =Pw , 0, = 20h - Pw , Oz= Oy9.Stresses around borehole are:iwill cause the hole to become unstableand collapse.10 borehole stability problems are often jencountered inthe orientation of the failure plane isindependent of the confining stress.

Table A and Table B are given. Various properties of Table A are matched with desirable properties…

Q4\ Match the items from list A with the suitable ones from list B: A В exceeds the tensile strength of Using insufficient mud weight in over- pressured formations 1 a formations A special feature for the Mohr– Coulomb criterion, 2 the ratio between the uniaxial compressive strength and the tensile strength is (8). In isotropic horizontal stress state, the principal stresses at the vertical borehole wall are: mechanical (in-situ stresses), chemical, thermal, and hydraulic effects. с 4 If the redistributed stress state in the d pure hydrostatic loading. vicinity of the wellbore exceeds the rock strength 5 Tensile failure occurs when the stress O:: Radial stress, oe: Tangential stress, e imposed by drilling mud 02: Axial stress In a principal stress plot of the Griffith criterion, f over pressured shales. The local stress distribution around a g wellbore are controlled by 7 then instability may result 8 Pore collapse may occur under h O, =Pw, 0o = 20h - Pw, Oz= Oy 9. Stresses around borehole are: i will cause the hole to become unstable and collapse. 10 borehole stability problems are often j encountered in the orientation of the failure plane is independent of the confining stress.

Q4\ Match the items from list A with the suitable ones from list B: A В exceeds the tensile strength of Using insufficient mud weight in over- pressured formations 1 a formations A special feature for the Mohr– Coulomb criterion, 2 the ratio between the uniaxial compressive strength and the tensile strength is (8). In isotropic horizontal stress state, the principal stresses at the vertical borehole wall are: mechanical (in-situ stresses), chemical, thermal, and hydraulic effects. с 4 If the redistributed stress state in the d pure hydrostatic loading. vicinity of the wellbore exceeds the rock strength 5 Tensile failure occurs when the stress O:: Radial stress, oe: Tangential stress, e imposed by drilling mud 02: Axial stress In a principal stress plot of the Griffith criterion, f over pressured shales. The local stress distribution around a g wellbore are controlled by 7 then instability may result 8 Pore collapse may occur under h O, =Pw, 0o = 20h - Pw, Oz= Oy 9. Stresses around borehole are: i will cause the hole to become unstable and collapse. 10 borehole stability problems are often j encountered in the orientation of the failure plane is independent of the confining stress.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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