Neutral Point

The neutral point is usually defined as the point in the drillstring where the axial stress changes from compression to tension. The location of this neutral point depends on the weight-on-bit and the buoyancy factor of the drilling fluid. In practice, since the WOB fluctuates, the position of the neutral point changes. It is therefore quite common to refer to a "transition zone" as the section where axial stress changes from compression to tension.

Drillstring components located in this "transition zone" may, therefore, alternately experience compression and tension. These cyclic oscillations can damage downhole tools. A prime example is drilling jars, whose life may be drastically shortened if the jars are located in the transition zone. It is also important, as previously explained, to know if any drill pipe is being run in compression. Therefore it is important to know the location of the neutral point.

Was this article helpful?

+1 0
Helping Your Child Learn To Read

Helping Your Child Learn To Read

When parents help their children learn to read, they help open the door to a new world. As a parent, you can begin an endless learning chain: You read to your children, they develop a love of stories and poems, they want to read on their own, they practice reading, and finally they read for their own information or pleasure. They become readers, and their world is forever expanded and enriched.

Get My Free Ebook


Responses

  • odetta pisano
    Where is neutral point in BHA design?
    7 years ago
  • Fastolph
    What is neutral point in drilling pipe?
    7 years ago
  • hagosa
    How to calculate neutral point in drilling jar?
    3 years ago
  • Belladonna
    How to determine a neutral point in the drill string?
    2 years ago
  • jemma
    Why do we avoid nuetral point on drilling string?
    2 years ago
  • blanco
    What is nutral point in drilling?
    1 year ago
  • Reijo
    How to calculate neutral point with drill pipe?
    1 year ago
  • ursula decker
    How to find the neutral point in a deviated well with a bumper sub?
    1 year ago
  • Meneaduc
    How can dectect the neutral point of the drilling string?
    9 months ago
  • Erling
    How to calculate neutral position pipe weight?
    21 days ago

Post a comment