Systems and methods for plugging a well

A method of plugging a cased well in a single downhole trip of a downhole tool, the method comprising:

• lowering the downhole tool within a cased well using a tool string;
• setting an upper resettable packer of the downhole tool in the cased well at a location uphole of a first perforation location, the upper resettable packer being immovably fixed axially in an axial position with respect to the downhole tool;
• perforating casing of the cased well at the first perforation location with the downhole tool with the upper resettable packer in the axial position;
• perforating the casing at a second perforation location via the downhole tool;
• setting a lower resettable packer of the downhole tool in the cased well at a location between the first perforation location and the second perforation location;
• and
• pumping cement through the downhole tool, out into a bore of the cased well through a flow-through assembly axially fixed with respect to and positioned internally across the upper resettable packer, and into an annulus of the cased well via the perforations in the casing at the second perforation location to create a plug, while the upper resettable packer remains in the axial position and the flow-through assembly remains in position relative to the upper resettable packer.

A downhole tool for use in plugging a cased well with a casing comprising a bore in a single trip downhole, the downhole tool comprising:

• an upper resettable packer that is immovably fixed axially in an axial position with respect to the downhole tool;
• a perforating gun located downhole from the upper resettable packer when positioned in the cased well and operable to perforate the casing of the cased well with the upper resettable packer in the axial position;
• a lower resettable packer that, when the downhole tool is positioned in the cased well, is downhole of the first perforating gun;
• and
• a flow-through assembly axially fixed with respect to, and positioned internally across, the upper resettable packer and configured to allow fluid flow into the bore of the cased well with the upper resettable packer still in the axial position and while maintaining the position of the flow-through assembly relative to the upper resettable packer.