- Title : Advanced Oil Well Drilling Engineering by Dr. Bill Mitchell
Mitchell Engineeering - Publish : The Society of Petroleum Engineers of the AIME, PO Box 833836, Richardson, Texas, 75083-3836, USA.
- Type Document : pdf
- Release : July 1995
- Total Page : 626 Page
- Size : 18.24 Mb
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Decrypted Contents
TUBULAR DESIGN AND USE
GENERAL
The axiom of tubular design is that the loads placed on a tube by natural phenomena must be offset by its strengths. There are many natural phenomena which could dictate a particular tubular design. Also, there are many theories for determining the strengths of a tube. The tubular designer must therefore derive practical design equations from the theories and phenomena. These equations represent the "criteria for tubular design".
COMMON FAILURE THEORY ASSUSPTIONS
The most common simplifying assumptions with regard to tubular strengths are that the failure theory known as the MAXIMUM STRAIN ENERGY OF DISTORTION THEORY applies only to tubular collapse strengths and that only biaxial- loads are considered within the theory. Thus tensile loads and burst loads are thought to be uniaxial and strengths are rationalized with the MAXIMUM PRINCIPAL STRESS THEORY OF FAILURE. Design factors are usually based on experience.
GENERAL
The axiom of tubular design is that the loads placed on a tube by natural phenomena must be offset by its strengths. There are many natural phenomena which could dictate a particular tubular design. Also, there are many theories for determining the strengths of a tube. The tubular designer must therefore derive practical design equations from the theories and phenomena. These equations represent the "criteria for tubular design".
COMMON FAILURE THEORY ASSUSPTIONS
The most common simplifying assumptions with regard to tubular strengths are that the failure theory known as the MAXIMUM STRAIN ENERGY OF DISTORTION THEORY applies only to tubular collapse strengths and that only biaxial- loads are considered within the theory. Thus tensile loads and burst loads are thought to be uniaxial and strengths are rationalized with the MAXIMUM PRINCIPAL STRESS THEORY OF FAILURE. Design factors are usually based on experience.
- This theory predicts failure of a specimen subjected to any combination of loads when the portion of the strain energy per unit volume producing change of shape (as opposed to change of volume) reaches a failure determined by a uniaxial test. Refer to Strengths of Materials, by S. Timonshenko, reprint 1976, Krieger Publishing Company.
- Biaxial loads are those which result in the material of a structure being subjected to the simultaneous action of tension or compression in two perpendicular directions. Reference same as above.
- Uniaxial loads are those which result in the material of a structure beingsubjected to the action of tension or compression in one direction only. Referencesame as above.
- This theory predicts failure of a specimen subjected to any combination ofnormal and shear stresses when the maximum principal stress, which is themaximum normal stress acting on a set of perpendicular planes which have noshear stress acting on them, reaches a failure value determined by a uniaxialtest. Reference same as above.
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