Acid Darts with Burst Discs

6.12. Cement Darts with Shearable plugs

The plug is held with a crosswire, whose thickness is given in the list and which shears at the given pressure. Pigs are designed to nest into each other so that a 2500psi pig can follow a 1750psi pig and they will shear in known succession. These pigs usually need a catcher for the plug.

These have only been made in the wire sizes indicated and for the coil tubing sizes indicated. The list could be extended, but some preliminary work with thicker wires suggests that it may be difficult to obtain consistent results.


1.25" CT For use in 098-125WT tubing

p/n 120061	72thou wire	2500psi orange

p/n 120062	64thou wire	1750psi blue

1.50"CT For use in 098-125WT tubing

p/n 120091	72thou wire	2500psi black

p/n 120092	64thou wire	1750psi white

120091/2 may stick in heavy wall tubing. For 156WT tubing, use 120093/4 instead; they use a reduced diameter centre to avoid sticking.


p/n 120093	72thou wire	2500psi yellow

p/n 120094	64thou wire	1750psi green

1.75"CT For use in 098-156WT tubing

p/n 120141	72thou wire	2500psi orange

p/n 120142	64thou wire	1750psi blue