Drillable seat for multi-stage tools

A method of forming a drillable seat for use in an oil and gas tool comprising:

• removably attaching a tooling piece to an upper portion of a sliding sleeve, wherein the upper portion of the sliding sleeve comprises a seat mold;
• pouring a settable material into the seat mold, wherein the settable material consists of a cement composition;
• causing or allowing the settable material to set;
• and
• removing the tooling piece from the upper portion of the sliding sleeve,
• wherein the drillable seat comprises;
• one or more sleeve shoulders located on an outside of the drillable seat that are in connection with an inside shoulder of the sliding sleeve, wherein the one or more sleeve shoulders comprise an angled portion;
• and
• a plug shoulder located on an inside of the drillable seat,
• wherein the drillable seat is configured to receive a compressive force in a first direction at the location of the plug shoulder and a compressive force in a second direction that is opposite from the first direction at the location of the one or more sleeve shoulders.