Abstract: A plug insert for use in a frac plug tool comprising a plug top, a plug body and an elastomeric O-ring, The plug top is shaped to rest on a seat of an upper end of a mandrel of the frac plug tool and the plug body is shaped to fit in a flow passage of the mandrel wherein the plug body includes a shear pin opening. The elastomeric O-ring is locatable around a portion of the plug body and sized to block fluid flow through the flow passage of the mandrel when the plug body is located in the flow passage. A frac plug tool for use in a well comprising the plug insert and a shear pin to hold that insert above the mandrel seat of the tool and method of assembling the tool are also disclosed.

Abstract: A plug insert for use in a frac plug tool comprising a plug top, a plug body and an elastomeric O-ring, The plug top is shaped to rest on a seat of an upper end of a mandrel of the frac plug tool and the plug body is shaped to fit in a flow passage of the mandrel wherein the plug body includes a shear pin opening. The elastomeric O-ring is locatable around a portion of the plug body and sized to block fluid flow through the flow passage of the mandrel when the plug body is located in the flow passage. A frac plug tool for use in a well comprising the plug insert and a shear pin to hold that insert above the mandrel seat of the tool and method of assembling the tool are also disclosed.