A modular well tubular head comprising: a bowl tubular for connecting with an uphole component, the bowl tubular comprising a bowl body; and a casing connector for reversibly connecting with the bowl tubular and with casing, the casing connector comprising a connector body, wherein a flow path is defined through the connector body and the bowl body; characterized in: a casing connector port defined in the connector body for providing fluid communication between the flow path and a flow line; a removable connection point reversibly connected with the casing body at the casing connector port, the removable connection point comprising a threaded box end for connecting with the flow line; wherein the bowl tubular comprises an uphole component connection point on the bowl body for connecting with the uphole component, a first modular connection point on the bowl body for reversibly connecting with the casing connector, and a hanger profile defined on an inside surface of the bowl body; the casing connector comprises a casing connection point on the connector body for connecting with the casing, and a second modular connection point on the connector body for reversibly connecting with the bowl body. a bowl tubular for connecting with an uphole component, the bowl tubular comprising a bowl body; and a casing connector for reversibly connecting with the bowl tubular and with casing, the casing connector comprising a connector body, wherein a flow path is defined through the connector body and the bowl body; characterized in: a casing connector port defined in the connector body for providing fluid communication between the flow path and a flow line; a removable connection point reversibly connected with the casing body at the casing connector port, the removable connection point comprising a threaded box end for connecting with the flow line; wherein the bowl tubular comprises an uphole component connection point on the bowl body for connecting with the uphole component, a first modular connection point on the bowl body for reversibly connecting with the casing connector, and a hanger profile defined on an inside surface of the bowl body; the casing connector comprises a casing connection point on the connector body for connecting with the casing, and a second modular connection point on the connector body for reversibly connecting with the bowl body. a casing connector port defined in the connector body for providing fluid communication between the flow path and a flow line; a removable connection point reversibly connected with the casing body at the casing connector port, the removable connection point comprising a threaded box end for connecting with the flow line; wherein the bowl tubular comprises an uphole component connection point on the bowl body for connecting with the uphole component, a first modular connection point on the bowl body for reversibly connecting with the casing connector, and a hanger profile defined on an inside surface of the bowl body; the casing connector comprises a casing connection point on the connector body for connecting with the casing, and a second modular connection point on the connector body for reversibly connecting with the bowl body.