Cement Plug with CemNET Technology Enables Sidetrack After Lost Circulation Event, Pakistan | Schlumberger
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Location
Pakistan, Asia
Details

Pakistan
Southern Provinces

Lithology
Naturally fractured limestone

Depleted zone depth, m [ft]
1,400 [4,600]

Initial mud weight, g/cm3 [lbm/galUS]
1.08 [9.0]

Loss-control mud weight, g/cm3 [lbm/galUS]
1.03 [8.6]

Sidetrack kickof point, m [ft]
1,050 [3,400]

Background
An operator was preparing to abandon a depleted zone and then sidetrack the well at a shallower depth to access additional reserves. Immediately after the depleted zone’s packer was milled, the well incurred circulation losses of 3.2–4.8 m3/h [20–30 bbl/h] across the perforations. The mud was loaded with sawdust and rice husk, reducing density to maintain the fluid level in the well for cementing.
Products Used
CemNET Loss-Control Fiber
LiteCRETE Lightweight Cement Slurry
SqueezeCRETE Remedial Cementing Solution

Cement Plug with CemNET Technology Enables Sidetrack After Lost Circulation Event, Pakistan

Low-density LiteCRETE slurry isolates depleted zone for abandonment

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To deliver lightweight cement with high compressive strength and avoid losses, Schlumberger designed and delivered a 2.4-m3 [15-bbl] cement plug comprising LiteCRETE slurry at 1.44 g/cm3 [12 lbm/galUS] and CemNET technology at 4.3 kg/m3 [1.5 lbm/bbl]. No losses were seen after the plug hit the perforations, and the well had full returns during reverse circulation. After setting, the plug was tagged with 5-t weight on bit and the well pressure tested to 6.9 MPa [1,000 psi].
Products Used
CemNET
Advanced loss-control fiber technology

Control lost circulation to improve cement returns.
LiteCRETE
Lightweight cement slurry

Optimize cement properties for reliable zonal isolation.
SqueezeCRETE
Remedial cementing solution

Repair extremely small gaps or fractures in wellbores at the microscale.

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