ABANDONMENT AND CONTAINMENT SYSTEM FOR GAS WELLS

摘要

The invention presents a method for plugging and abandoning spent wells. An expandable liner hanger having sealing elements positioned thereon, is run-in and expanded, creating at least one seal against fluid migration. A redundant seal is created using a swellable annular sealing device, such as a swell packer. The swell packer and liner hanger are run-in and expanded. A bottom valve is closed and the expansion and running tools released from the liner hanger. After pulling out of the running tool, the wellbore is cemented creating an effective plug.

主权项

1. A method for plugging and abandoning a subterranean wellbore having a casing positioned therein, the method comprising the steps of:
running a tool string into the wellbore, the tool string having a swellable annular sealing device, and an expandable liner hanger with at least one annular sealing element mounted thereon; radially expanding the swellable annular sealing device; creating a fluid-tight annular seal between the swellable annular sealing device and the casing; radially expanding the expandable liner hanger and contacting the casing with the at least one annular sealing element; and creating a fluid-tight annular seal between the expandable liner hanger and the casing, wherein the step of radially expanding the swellable annular sealing device further comprises the step of exposing a swellable material positioned on the device to an actuating fluid, an actuating chemical, or to heat.