Expandable Patches Repair Sand Screens in Horizontal Well | SLB
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Tech Report

Expandable steel patches overlapped to repair sand screens in horizontal well

Published: 01/22/2018

 
Schematic shows six expandable steel patches overlapped to repair damaged screens in horizontal well.
After a test run, CT was used to run four overlapping patches to cover the lower zone and two patches to cover the upper zone. Subsequently, the CT was pressurized to inflate the packer used to expand the patches and mold them to the ID of the damaged screen sections—even across overlaps. This operation marked the first time
  • 114-mm [4 1/2-in] patches were set in 127-mm, 26.8-kg/m casing
  • six patches with four overlaps were set in a single well
  • a horizontal screen repair was performed via CT at >4,000-m MD.
Location
Caspian Sea
Details

Casing size and weight
127 mm, 26.8 kg/m
[5 in, 18 lbm/ft]

Intervention zone 1
4,014–4,062 m
[13,169–13,327 ft]

Intervention zone 2
3,874–3,898 m
[12,710–12,789 ft]

Background

A Caspian operator identified damaged sand screens in two zones of an openhole gravel-packed horizontal well. To avoid pulling the completion or plugging back the lateral, the operator decided to patch the damaged sections, which were 24 m and 48 m [79 ft and 157 ft] long, respectively. Coiled tubing (CT) was available to run expandable steel patches, but it had never been used to perform this operation at more than 4,000 m [more than 13,100 ft]. In addition, the riser limited maximum patch length to 14 m [46 ft].
Products Used
Standard and HT Expandable Steel Patches
Rated up to 482 degF [250 degC]

For oil and gas well casing leak repair, perforation shutoff, tubing repair, and other remedial operations.
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