Digger Differential fill-up Float Shoe allows 90% casing fill-upduring run-in, reducing
surge pressures caused by the piston effect of running in restricted I.D. Use of differential shoe provides additional buoyancy by allowing only 81% casingfill-up further enhancing works efficiency.
Circulating can be established at any time while running in. Dropping a ball
converts the differential valve to a regular back-pressure valve. When collar and
shoe are run together, dropping one ball converts both units.
After allowing
sufficient time for ball to reach the equipment conversion can be achieve by
applying approximately 600-800psiofpumppressure(adjustable)
Available sizes 3 1/2” to 6 5/8” and any special sizes can be custom made as required.
Digger Autofill float collar permits the casing to fill automatically while being run into thehole. The valve is always in open position, allowing maximum filling of the casing as it running in the wellbore.This is especially effective on liner job and sensitive hole conditions.
Features:
Casing can be automatically filled up during running-in.
Casing can be circulated at any time at low rates, without having to convert
the valve from the fill-up to the back-pressure mode.
It can be provided in conventional as well as with non-rotating profile.
PDC Drillable.
Available sizes 3 1/2” to 6 5/8” and any special sizes can be custom made as required.