Patent ID: 9534477
Date: 2017-01-03
CPC Classifications: E21B

Claim:
1. A method for installing a flexible liner by eversion down a borehole, the method comprising: attaching a hollow fixture atop a casing of a borehole; situating a bypass pipe between the casing and an interior of the fixture, an open bottom end of the bypass pipe extending a distance into the borehole and an open top end extending into the interior of the fixture, whereby any water flowing upward in the borehole toward the casing can flow upward through the bypass pipe and into the interior of the fixture; securing a first end of a flexible liner above the casing; disposing the liner into the fixture; adding a water-based mud into an interior of the liner to create a liner interior pressure; everting the liner, by the liner interior pressure, down the borehole, with the bypass pipe outside the liner; and allowing water to flow upward from the borehole from beneath an everting second end of the flexible liner through the bypass pipe and into the interior of the fixture.