Patent ID: 7726393

Claim:
A wellhead assembly comprising: a casing; a first tubular member extending above the casing said first tubular member comprising an inner surface comprising at least a first portion and a second portion wherein the first portion has a greater diameter than the second portion; a first tubular member flange extending from the first tubular member; a generally elongate annular member in the first tubular member, said annular member having a first end portion extending above the first tubular member and a second end portion below the first end portion, said generally elongate annular member interfacing with at least one of said first tubular member inner surface portions, wherein the generally elongate annular member is a wellhead isolation tool; a second flange extending from the wellhead isolation tool; a seal interposed between the wellhead isolation tool and the first tubular member; a fastener fastening the second flange to the first tubular member flange; and a production tubular member aligned with the wellhead isolation tool, wherein an axial force acting on the wellhead isolation tool will be reacted in the second flange prior to being reacted in the first tubular member flange, wherein said first tubular member comprises an inner lip portion, wherein the inner lip portion extends between the wellhead isolation tool and the production tubular member.