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Is it possible to suck air out of drilling hole completely?

  1. Feb 22, 2016 #1
    and after sucking air out we seal off the hole in order to eliminate any change in influx and pressure downhole?
    and if possible, what would be the procedure?
     
  2. jcsd
  3. Feb 22, 2016 #2

    BvU

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    Hello Ahmed,

    Is this about holes in wood, plastic, metal ? Or about holes in the earth ?
    You cannot assume everybody who wants to help knows everything about your context - or posesses telepathic capabilities !
     
  4. Feb 22, 2016 #3
    How does the air stay down there in the first place. Wouldn't it rise up through the borehole?

    Chet
     
  5. Feb 22, 2016 #4

    CWatters

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    The word completely in the title suggests removing 100% of the air leaving a vacuum. Hard vacuums are difficult to produce. What are you trying to achieve?
     
  6. Feb 22, 2016 #5
    He's talking about boreholes for wells drilled into the ground, which are typically filled with water up to the water table. He seems to be asking if air can be removed (a second phase) from below the water level. Most wells for oil and gas production have a pipe running down the center of the borehole that is cemented in place to the surrounding geological formation (except at the very bottom few meters). Where this air would be located and how it got there would be the puzzle to me.

    Chet
     
  7. Feb 22, 2016 #6
    i mean when if i drill with a small machine underground and seal off the hole after machine is set underground and all air is sucked out, will that eliminate the change in pressure. the machine will be underground and no air will be to enter the hole from the surface so that will cancel the change in influx and resulting in a kick, right?(my theory is that pressure of any kind is present when air is, i think)
    i'm just thinking out loud here so would really appreciate your help.
    thanks..
     
  8. Feb 22, 2016 #7
    I stand corrected.
     
  9. Feb 22, 2016 #8
    so do you think my theory is correct?
    i dont know if it was stated before or not, i tried looking online but couldn't find anything
     
  10. Feb 22, 2016 #9
    I'm really not able to even come close to understanding what you are asking.
     
  11. Feb 22, 2016 #10
    in usual drilling operations, drilling fluid is pumped in to balance the formation pressure in order not to get a kick( change in influx rate from formation fluid and gases) and blowing. so instead of using drilling fluid which is more dense than the formation pressure we could suck air out of the hole when a small machine( a single machine like a small car for example) is set downhole and then seal off the hole. like drilling through an air free rock in outer space, if the rock isn't injected with air( drilling pipe) no matter the fluids in it, it won't change the ratio of pressure already present.
    am i making any sense here?
     
  12. Feb 22, 2016 #11
    No. And I have some experience with drilling mud and formation fluids.
     
  13. Feb 23, 2016 #12

    CWatters

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    Unlike Chester I've no experience of drilling oil wells. However..

    I can see how using a dense drilling fluid might help stop oil or gas being pushed up the drill hole. That makes sense.

    I can see how using air instead of drilling fluid would be less effective. Air is less dense than drilling fluid so the pressure created at the bottom of the well by the air would be less than that created by drilling fluid. So it would be less able to counter the pressure in the oil/gas.

    How would using something even less dense than air (like a vacuum) be better?

    Not to me.
     
  14. Feb 23, 2016 #13
    He may think that if there is no air there is no pressure. Based on this quote:
    "(my theory is that pressure of any kind is present when air is, i think)".
     
  15. Feb 24, 2016 #14
    yes that's exactly what i mean. i know that air is less dense than the drilling fluid but if there is no air inside the hole from the beginning then oil and gas will be less dense therefore it won't blow up to the surface
    right?
     
  16. Feb 24, 2016 #15

    Bystander

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    Wrong. Formation pressure is formation pressure.
     
  17. Feb 24, 2016 #16
    can u explain why would it be wrong?
    just for clarifying, when i suck air outside of the drilling string connected to the reservoir the formation fluids will be less dense so the pressure will decrease and it wont result in a kick
     
  18. Feb 24, 2016 #17
    What makes you have this strange idea that the formation fluids will be less dense? Formation fluids are virtually incompressible.
     
  19. Feb 25, 2016 #18

    davenn

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    regardless of if there is air or something else placed in the drill hole .... the oil and gas underground is under intense pressure and the presence or absence of anything else in the hole isn't going to change that

    indeed


    Dave
     
  20. Feb 25, 2016 #19

    CWatters

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    Removing the air won't make the oil or less dense. Even if it did make it less dense it wouldn't reduce the pressure. Its the pressure that causes the oil to be pushed to the surface.
     
  21. Feb 25, 2016 #20
    This thread is sucking the air out of all of us!!!
     
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