External casing packer and method of performing cementing job

A method comprising:

• providing a packer comprising:
• a mandrel,
• a primary opening seat attached to an interior of the mandrel,
• a secondary opening seat attached to the interior of the mandrel,
• a landing seat attached to the interior of the mandrel,
• a packer element attached to an exterior of the mandrel, and
• a closing seat attached to the interior of the mandrel,
• wherein the secondary opening seat is between the primary opening seat and the landing seat,
• wherein the primary opening seat is between the closing seat and the secondary opening seat,
• wherein the primary opening seat is configured to engage an opening plug and move from a first position where the primary opening seat covers an opening to a second position where the primary opening seat does not cover the opening,
• wherein the secondary opening seat is configured to engage the primary opening seat and move from a first position where the secondary opening seat covers a port to a second position where the secondary opening seat does not cover the port,
• wherein the landing seat is configured to engage the secondary opening seat and provide a seal,
• wherein the packer element is configured to set when the port is not covered and the seal is provided, and
• wherein the closing seat is configured to engage a closing plug and move from a first position where the closing seat does not cover the opening to a second position;
• where the closing seat covers the opening;
• providing the opening plug;
• providing the closing plug;
• placing the opening plug into the packer;
• and
• placing the closing plug into the packer;
• wherein placing the opening plug into the packer precedes placing the closing plug into the packer.

A method comprising:

• providing a packer comprising:
• a mandrel,
• a primary opening seat attached to an interior of the mandrel,
• a secondary opening seat attached to the interior of the mandrel,
• a landing seat attached to the interior of the mandrel,
• a packer element attached to an exterior of the mandrel, and
• a closing seat attached to the interior of the mandrel,
• wherein the secondary opening seat is between the primary opening seat and the landing seat,
• wherein the primary opening seat is between the closing seat and the secondary opening seat,
• wherein the primary opening seat is configured to engage an opening plug and move from a first position where the primary opening seat covers an opening to a second position where the primary opening seat does not cover the opening,
• wherein the secondary opening seat is configured to engage the primary opening seat and move from a first position where the secondary opening seat covers a port to a second position where the secondary opening seat does not cover the port,
• wherein the landing seat is configured to engage the secondary opening seat and provide a seal,
• wherein the packer element is configured to set when the port is not covered and the seal is provided, and
• wherein the closing seat is configured to engage a closing plug and move from a first position where the closing seat does not cover the opening to a second position;
• providing the opening plug;
• placing the packer in a wellbore;
• placing the opening plug into the wellbore;
• providing sufficient pressure to land the opening plug on the primary opening seat and move the primary opening seat from the first position to the second position thereby uncovering the opening, land the primary opening seat on the secondary opening seat and move the secondary opening seat from the first position to the second position thereby uncovering the port, and set the packer element.