ACP / ECP annular casing packers (also known as external casing packer) are one of the packers types that is popular because they provide improved sealing and centralization (check also: Permanent Packers). They are used to: Prevent gas migration. Reduce the gas-to-oil production ratio. Reduce or prevent water production. Isolate production or injection zones. Avoid … Continue reading External Casing Packer ECP Applications & Mechanism