Page 80 - Well Control for Completions and Interventions

Well Construction and Completion Design 71

Figure 2.4 Slotted liner. Source: Image courtesy of Euroslot.

Figure 2.5 Predrilled or slotted liner completion. Left: Single zone. Right: Multiple
zone with ECP or swell packer zonal isolation.

Table 2.2 Predrilled and slotted liner completions summary
Advantages Disadvantages
Relatively cheap—elimination of Water or gas entry difficult to control
cementing costs (and time) unless external casing packers or
“Swell” packers are used
Elimination of perforating costs Not easy to selectively stimulate
different parts of the producing
interval unless ECP’s or swell packers
are used
Slots can be sized to give a degree of Mud filter cake very difficult to remove
sand control in course sand and can leave residual damage
formations
Some degree of borehole stability Reduction in diameter over producing
achieved interval
Some production logs difficult to
interpret—at worst they become
meaningless