New openhole packer enabled isolation of unwanted zones
Alternate Path screens and shunted swell packers have traditionally
provided a solution for multizone openhole gravel packing, but the packer
swelling process is slow, increasing costs—especially in deepwater
applications—while the rig waits. Pumping gravel before swelling is
complete can cause the gravel to enter the packer element–wellbore
annulus, preventing an effective seal.
The new OSMP OptiPac service mechanical packer addresses all these
concerns. The mechanically activated packer is hydrostatically set in a matter
of seconds as the setting tool moves through it. Gravel packing can begin
immediately without affecting the seal, saving a significant amount of rig
time. The packer is equipped with field-proven Alternate Path shunt tubes. Once
the uppermost zone is packed, gravel is diverted through the shunt tubes to the
next zone, and the process repeats until all the zones are packed.
Operator saved more than USD 100 million and enhanced recovery
OptiPac openhole gravel-pack service and OSMP packers delivered complete
gravel packs in Wells 1 and 3, confirmed by downhole gauge data and mass
balance analysis. Two OSMP packers straddling the unwanted zone in Well 1 and
shunted blanks across the zone enabled isolation of the zone, reducing the well
count by two and saving Total >USD 100 million.
A single packer in Well 3 provides the ability to seal off the lower
reservoir layers by setting a high-expansion plug in a section of blank pipe
when water breaks through in the future. Cost-effective water management gives
Total the opportunity to produce at an accelerated rate and improves ultimate
recovery. Reservoir simulations show that water shutoff can result in an
incremental production of 1,000,000 BOE from field B.
Well 2 is scheduled for openhole gravel-pack completion at a later date;
it will use two OSMP packers with shunted blanks in between to isolate the
water zone. Total is currently evaluating the deployment of additional OSMP
packers in future wells. For further details, read SPE 189491.