The SealRight Open Hole Isolation Packer is a mechanical packer that enables instant isolation of zones within the reservoir, providing a rapid, simple and cost-effective method of zonal isolation. This packer can be run in open or cased hole applications, and maintains full bore access in high angle and horizontal wells. Run as an integral part of the liner string, multiple packers can be spaced out as required to isolate between reservoir stages. The liner string is then plugged off and pressure is applied from the surface to the predetermined setting pressure. This pressure enters the packer setting chamber, allowing the setting piston to displace the seal elements outwards against the wall of the open hole creating an immediate pressure-tight seal.