Shield a derated external casing packer valve from fracturing
Set in a plug-and-perf horizontal well, an ECP valve was derated to
6,000 psi [41 MPa] by the manufacturer after being run in a formation that
required a fracturing pressure of 6,800 psi [47 MPa].
It was determined that the best solution was to keep the ECP in place
but cover the valve with a casing patch to shield it from fracturing pressure.
However, a patch would reduce the diameter the plugs had to pass through, and a
cleanout operation to remove plugs and start production could prove
Deploy an expandable steel patch to accommodate minimum ID
The operator had planned to run plugs with an OD of 4.425 in [112.395
mm] for the stimulation operations and switch to 4.3-in [109.22-mm] plugs if
needed. However, a conventional 5.5-in, 20-lbm/ft [139.7-mm, 29.76-kg/m] casing
patch would not have a sufficient ID to allow even the 4.3-in plugs to pass
through the patch.