Diverter Procedure While Drilling Fixed

(1) Where shallow casing strings or conductor pipe are set, fracture gradients will be low. It may be impossible to close the BOP on a shallow gas kick without breaking down the formation at the shoe. If a shallow gas kick is taken while drilling top hole then the kick should be diverted.

Drilling shallow sand too fast can result in large volumes of gas cut mud in the annulus and cause the well to flow, also fast drilling can load up the annulus increasing the mud density leading to lost circulation and the level in annulus drops far enough then well may flow.

When drilling top hole a diverter should be installed and it is good practice to leave the diverter installed until 133/8'' casing has run. An automatic diverter system should first:

  1. Open an alternative flow path to overboard lines.
  2. Close shaker valve and trip tank valve.
  3. Close diverter annular around drill pipe.
  4. If there are two overboard lines then the upwind valve should be manually closed.
  • 2) If any indication of flow is observed while drilling top hole, close diverter immediately as the gas will reach surface in a very short time and it is inadvisable to attempt a flow check.
  • 3) Suggested diverting procedure in the event of shallow gas kick.
  1. Maintain maximum pump rate and commence pumping kill mud if available.
  2. Space out so that the lower safety valve is above the drill floor.
  3. With diverter line open close shaker valve and diverter packer.
  4. Shut down all non-essential equipment; if there is an indication of gas on rig floor or cellar area then activate deluge systems.
  5. On jack-up and platform rigs monitor sea for evidence of gas breaking out around conductor.
  6. If mud reserves run out then continue pumping with seawater.
  7. While drilling top hole a float should be run. This will prevent gas entering drill string if a kick is taken while making a connection. It will also stop backflow through the drill string on connection.
Annular Bop Diverter
Figure 2 - Floating Rig Example of Line Up (Shut-In)

This can be used as a reference template to line up the following procedures.

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Responses

  • JOE
    What is a deverter in Well control?
    2 years ago
  • wiseman
    When and why should a well diverted?
    2 years ago
  • john
    Is diverter connected above or below BOP?
    1 year ago
  • jemima
    When drilling shallow why are diverters used instead of bop?
    1 year ago
  • karita vaara
    When is a diverter used in drilling operations?
    1 year ago
  • WILLIE
    What is a diverter stack in driling?
    12 months ago
  • Felix
    What is the main reason for a diverter drill?
    11 months ago
  • ULRICH
    Where in drill string is the diverter?
    9 months ago
  • markku
    How a Diverter system works in a operating sequence?
    9 months ago
  • harry
    What is a drilling divertor for?
    9 months ago
  • Immacolata
    Can BOP trip drill be done without closing the BOP?
    8 months ago
  • will
    What is a diverter used for drilling wells?
    7 months ago
  • fulgenzio
    What is drill hole size for flexifit diverter?
    5 months ago
  • gianni
    What is a surface diverter in drilling?
    5 months ago
  • klaudia
    What happens if i connect a diverter spool to a mud tank during kicks?
    5 months ago
  • John
    What is the work of a diverter in drilling?
    3 months ago

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