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Thread: Simple question about force and pressure

  1. #1 Simple question about force and pressure 
    Average Human guymillion's Avatar
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    When would it be an appropriate time to use the following equation:

    force=pressure*area

    What exactly is this equation saying? How can it be used?

    It seems simple, but I want to really understand what it means.


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    Genius Duck Moderator Dywyddyr's Avatar
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    Hydraulic systems.
    Gun barrels (internal ballistics).
    Manometers.
    Submarine hulls.


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    Forum Bachelors Degree Kerling's Avatar
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    Also politics
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    In the information age ignorance is a choice.
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    Universal Mind John Galt's Avatar
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    Quote Originally Posted by guymillion View Post
    When would it be an appropriate time to use the following equation:

    force=pressure*area

    What exactly is this equation saying? How can it be used?

    It seems simple, but I want to really understand what it means.
    Here is a specific example. First the background information.

    When drilling oil and gas wells a drilling fluid is used which contains particles that coat the borehole wall against permeable formations. On angled wells the drill string tends to lie on the low side of the hole, against this filter cake. Typically, in order to control the formation pressures, the hydrostatic head of the mud will be set above formation pressure, so there is a net pressure pushing the drillin string against the formation. Use the equation to determine the magnitude of that force and you can quickly see that if an extended length of the string is so constrained it will be impossible to move it. This stuck pipe condition is something the well design program takes great pains to avoid.

    I am certain there are hundreds, no thousands, of comparable detailed examples in every industry.
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