Improve production with high drawdown and clean perforation tunnel
Petroleum Development Oman (PDO) was drilling in the Saddad area in the
Al Wusta region and wanted to decrease its operation time while completing a
vertical well. With a potentially high volume of oil located within the Khaleel
(Karim) reservoir, the common completion strategy has yielded a flow rate of
240 m3/d. The operator conducted additional studies on ways to
produce more from this reservoir. A clean perforation tunnel can be achieved
using high-pressure drawdown and has been proven as a key contributor to
improve the productivity up to 450 m3/d, a 87.5% increase in
comparison with previously used completion strategies.
Deploy robust packer to minimize release risk from gun shock
Schlumberger recommended using the robust QUANTUM RH retrievable
hydraulic-set sealbore production packer, which features superior strength
constraint in comparison with conventional retrievable or permanent packers and
enables reliable, easy completion string recovery. In addition, an automatic
gun release system was used to immediately drop the guns and begin producing
the well after the perforation was established. A completion fluid was used to
create a static underbalance condition during perforation that maximized
perforation tunnel clean out and enabled well flow to surface.
Save USD 700,000 in operating costs and increase oil production
Combining the well completion strategy with tubing-conveyed perforation
in a "shoot and drop" operation saved two days in rig time with a single trip
downhole. The automatic gun release system eliminated the need to initiate well
production after a planned CT operation, resulting in a combined estimated
total of USD 135,000 in operational cost savings for the well.
The technology was then used in six additional wells, increasing
production by an average of 200 m3/d of oil per well and saving a
total of USD 700,000 in associated well costs for all seven wells.