www.sigra.com.auSigra Pty Ltd93 Colebard St West, Acacia Ridge,
QLD, Australia, 4110+61 7 3216 6344 [email protected]
The packer is fitted to the casing string then run into the
drill hole. A ball value is dropped into the casing to seal the
bottom valve. The casing is pressurised with fluid, inflating the
packer which seals the borehole wall. When the pressure rises
sharply the burst valve opens allowing fluid to flow into the outer
annulus. Cement grout may then be pumped via the casing to seal the
casing to the formation. The burst valve acts as a non-return valve
to prevent the return of grout into the casing.
After the correct volume of cement grout is pumped into the
casing, a cement displacement plug is pumped in until it reaches
the non return valve whereupon a hydraulic lock is formed. The
drill string may then be run into the casing to drill out the
cement displacement plug, cement grout and bottom valve.
The packer system has no sliding seals where leaks would occur,
and it will remain inflated for a long period. It is remarkably
easy to use.
EXTERNAL CASING PACKER
The Sigra external casing packer is an easily set packer for use
when cementing holes above a set depth. In its initial form, it is
built on 7" casing with API Buttress threads. The casing packer is
83⁄32" (206mm) in diameter for use in 8½" to 12" drill holes. The
packer is designed for a hold back pressure differential of 1000psi
(7mpa).
Production Equipment
PE-ECP-04/2010
Differential pressure graph
Maximum Differential Pressure (MPa)
Differential pressure graph
