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A sealing mechanism is provided. In one embodiment, a system includes a connector configured to couple one or more flow-control valves to equipment installed at a well and an isolation sleeve configured to be retained by the connector. The isolation sleeve may include a seal and a hydraulically actu

A sealing mechanism is provided. In one embodiment, a system includes a connector configured to couple one or more flow-control valves to equipment installed at a well and an isolation sleeve configured to be retained by the connector. The isolation sleeve may include a seal and a hydraulically actuated piston disposed adjacent one another about a body of the isolation sleeve such that actuation of the piston engages the seal. Additional systems, devices, and methods are also disclosed.

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1. A system comprising: a connector configured to couple one or more flow-control valves to equipment installed at a well; andan isolation sleeve configured to be retained by the connector, the isolation sleeve including a body, a seal disposed about the body, and a hydraulically actuated piston dis

1. A system comprising: a connector configured to couple one or more flow-control valves to equipment installed at a well; andan isolation sleeve configured to be retained by the connector, the isolation sleeve including a body, a seal disposed about the body, and a hydraulically actuated piston disposed about the body adjacent to the seal, wherein the hydraulically actuated piston is positioned to engage the seal and to drive the seal along the body in response to actuation. 2. The system of claim 1, wherein the seal includes an elastomeric seal. 3. The system of claim 2, wherein the body includes a shoulder and the hydraulically actuated piston is positioned to drive the seal over the shoulder onto a portion of the body with a larger circumference in response to actuation. 4. The system of claim 3, wherein the body, the seal, and the hydraulically actuated piston are configured to enable the hydraulically actuated piston to energize the seal in response to actuation such that the seal engages a bore of a component of the equipment installed at the well when the isolation sleeve is positioned within the bore. 5. The system of claim 1, wherein the connector and the body of the isolation sleeve include passageways connected to one another to route hydraulic control fluid through the connector and the body of the isolation sleeve to the hydraulically actuated piston. 6. The system of claim 1, comprising the one or more flow-control valves. 7. The system of claim 1, wherein the connector is configured to couple the one or more flow-control valves to a blowout preventer installed at the well. 8. The system of claim 1, wherein the connector is configured to couple the one or more flow-control valves to a wellhead component installed at the well. 9. The system of claim 1, comprising the equipment installed at the well. 10. A system comprising: an isolation sleeve including a body, a seal disposed about the body, and a piston disposed about the body that divides a recess in the body into first and second regions, the body including an internal passageway connected to the first region to enable fluid to be routed into the first region via the internal passageway to actuate the piston and energize the seal by driving the seal along the body. 11. The system of claim 10, comprising a collar disposed about the body such that the seal is disposed between the collar and the piston. 12. The system of claim 11, wherein the collar is secured to the body with one or more shear pins. 13. The system of claim 10, wherein the piston includes at least one vent hole connected to the second region to allow fluid in the second region to exit the recess through the at least one vent hole. 14. The system of claim 10, comprising a connector having a first end configured to retain and seal the isolation sleeve within a component of a well capping system and a second end configured to enable sealing with a wellhead assembly component. 15. A method comprising: aligning a connector of a well capping system with equipment installed at a well, the connector including an isolation sleeve;moving the isolation sleeve into a bore of the equipment installed at the well; andapplying hydraulic pressure to a side of a piston of the isolation sleeve to actuate the piston and engage a seal to cause the seal to be driven over a shoulder of the isolation sleeve to energize the seal against the bore of the equipment installed at the well. 16. The method of claim 15, comprising activating a valve of the well capping system to inhibit flow of fluid through the well capping system. 17. The method of claim 15, comprising: venting the hydraulic pressure to release the piston; andremoving the isolation sleeve from the bore of the equipment. 18. The method of claim 15, wherein moving the isolation sleeve into a bore of the equipment installed at the well includes moving the isolation sleeve into a bore of a wellhead component or a blowout preventer. 19. The method of claim 15, wherein applying hydraulic pressure to the side of the piston includes routing hydraulic control fluid through both the isolation sleeve and another component of the connector into a chamber adjacent the side of the piston.