FAQ

FAQ

  1. What is the Pressure Drop thru PBL?
    No significant Pressure Drop , even when cage is full.
    Pressure drop = pQ2/10858 (A)2 psi (p-Mud weight lb/gal, Q-circulation rate gpm, A-Area in2)
     
  2. When deactivated, do the balls in the cage create a flow restriction?
    The balls in the cage do not create a flow restriction.
     
  3. Where do you install the PBL?
    Normally just above the Mud motor & MWD, LWD collars but can be placed in string wherever required.

  4. How many cycles are possible during one run?
    4 for 4 ¾” & 5 for 6 ¾”, 8 ¼”, 9 ½” (See the Spec table for more details).
    Extended catcher cages to accommodate up to 10 sets of balls (cycles) are available on request.
     
  5. What is the drift of the PBL?
    4 ¾’- 1.25, 6 ¾”-1.27/1.50, 8 ¼”-1.50/2.27 (See the Spec table for more details).
    If other ball drop tools are placed below the PBL we would recommend to Drift the PBL on site to make sure required balls will pass thru’ the PBL.
     
  6. Can you pump cement thru the PBL?
    Yes, you can pump thixotropic cement thru the PBL tool.
     
  7. How much LCM can be displaced thru the PBL once opened?
    No limitations to the amount of LCM that can be pumped
     
  8. Can other ball activated tools be run below the PBL?
    Yes, but the NO-GO must be sized for the other tools (see question Nr. 5)
     
  9. What length does the PBL have?
    8 – 9 ft (2,4 m – 2,8 m) - the length COULD vary SLIGHTLY according to ANY connection rework
     
  10. What connections does the PBL have?
    NC38 NC 50 6 5/8” Reg & 7 5/8” Reg.
    Available on all standard drill pipe connections. Alternative connection also available on request. (See the Spec. table for more details)

  11. Are HT connections available on PBL’s?
    Yes but please allow lead-time for special connections.
     
  12. What is the TFA thru the ports on the PBL?
    4 ¾’- 1.901sq/in, 6 ¾”-2.454sq/in, 8 ¼”-3.534sq/in. (See the Spec table for more details)

  13. Can multiple PBL’s be run at the same time?
    Yes they can, please refer to DSI Rep for advice.
     
  14. What kind of material are the activation balls?
    Torlon (Black) for 4 ¾” OD and smaller (rated to 450F or 232C)
    Ertalyte(White) for 6 ¾” OD above size. (rated to 340F+ or 171C+)
    Torlon can be supplied for larger tool sizes on request for HTHP applications.
     
  15. What is the shear value/De-activation Pressure of the PBL’s?
    Varies from 1500psi - 5000psi (on customer request). All tools are dressed with specific PSI seats, typically 2800 to 3,000 psi. Lower psi seats can be supplied for land rigs or where requested.
     
  16. What limits the quantity of cycles on the PBL?
    Length of the catcher cage.
     
  17. Can the PBL be cycled more than the recommended amount of times?
    Not during one run but after empty the balls from the cage you can run the tool again.
     
  18. When using Darted Activation Balls, how many times can the PBL be Cycled?
    3 for 4 ¾” & 4 for 6 ¾”, 8 ¼”, 9 ½” (See the Spec table for more details).
    With extended catcher cages more cycles are possible.
     
  19. What is the highest angle that an activation ball can be dropped with circulation thru the bit?
    The activation ball can be dropped up to an hole angle of 90° and above.
    DE-activation has been achieved in holes of +90 Degrees
    The ball-dart combination is recommended with a hole angle of 55°.

  20. What are the procedures for Activating/Deactivating the PBL?
    Please check the operating instruction available on our website
     
  21. What is the max operating temperature that the PBL can be used?
    Up to 450F or 232C
     
  22. Is there any flow to the bit once the PBL is activated?
    No, there is no flow to the bit anymore.

  23. How many hours downhole can the tool be used?
    300 +hrs (it is not recommended to make a special pipe trip to remove the PBL from the BHA if maximum limit met)