案例分享 Expandable steel patches restored casing integrity for sidetracking after cement squeezes proved ineffective
Enabled production from existing slot in mature field despite fully penetrating casing wear across 26 ft.
Casing Repair
Restore completion integrity after casing damage
Use through-tubing technology to rapidly remediate corroded and worn casing
Casing damage is often considered a problem of mature wells, suffered only after years or decades of corrosion, erosion, or wear fatigue, However, it is increasingly occurring in newer wells because of the wear incurred while installing initial casing in long horizontal and tortuous wellbores.
Casing repair options depend on the size and condition of the casing, the depth and extent of the leak or damage, and the productivity (economics) of the well. Schlumberger offers a full range of casing isolation, repair, and replacement technologies.
Isolate the Damage
Squeeze cement into the damage to restore isolation without impeding wellbore ID, or place a cement plug or mechanical packer or plug to isolate the damaged zone.
Patch the Casing
Run a patch through tubing across the damaged zone, and isolate the damaged casing by cementing it in place or inflating it to create a complete seal while retaining nearly full wellbore ID.
Cut and Reconnect the Casing
Cut off the damaged casing and leave a stub that can be connected to a new casing string.
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