Floats in the BHA play a critical role in protecting
the rig from uncontrolled hydrocarbons in the formation.
However running into hole (RIH) with a float, or
non-return valve (NRV), can be operationally inconvenient.
The float will add surge pressure to the formation
and also creates a fluid void in the drill pipe that needs
periodic top-filling to prevent the pipe from collapsing.
the Churchill SFF, one super-major measured 3 hours twenty
minutes saved per 10,000 feet RIH.
Self-Filling Float (SFF) takes a different approach,
allowing the operator to select the timing of the
float activation. By using the SFF rapid, surge-free
RIH can be achieved before activation puts it into
a fully protected mode, providing two high quality
non return barriers between the rig and the formation.
The SFF will allow the string to self-fill whilst
RIH. This saves 30%-50% of the time spent tripping
into hole compared to regular floats.
Formation damage induced by surge pressures can be
avoided with the SFF in the open position. If surge
is an issue the SFF allows faster RIH before reaching
the speed threshold.
shallow-hole MWD testing
Full pumping capability is retained during RIH. Pumping
will not prematurely shear out the pins and so there is
no restriction on shallow-hole testing at any time.
& Rapid activation - No activation wait times
Approaching activation depth the steel dart is dropped whilst
the final few stands are RIH so that it is in place when
needed. Watch our movie
to see how the dart can be dropped 'early' so there is zero
The Flapper type has a large thru-bore prior to activation,
allowing activation balls to be delivered through the SFF
into tools below it.
Resistant to 350°C (660°F), the SFF uses high quality
materials to deliver performance in any environment.
flow rate performance
Optimised internal geometries and high durability surface
finishes mean that pressure loss is minimal and the SFF
can handle any anticipated flow rate.