Washpipe assemblies for a power swivel

A power swivel for rotating a tubular string to form a borehole in a subterranean formation, the power swivel comprising:

• a motor;
• a stem coupled to the motor to rotate the stem about a rotational axis, wherein the stem is configured to be coupled to the tubular string;
• a washpipe assembly in fluid communication with the stem, wherein the washpipe assembly includes a central axis and comprises:
• a washpipe including a radially outermost cylindrical surface;
• and
• a lower packing assembly coupled to the stem, wherein the lower packing assembly includes a seal assembly;
• wherein the seal assembly includes a plurality of annular seal members each including a body and a contact insert mounted to the body, wherein the contact insert is sealingly engaged with the radially outermost cylindrical surface of the washpipe.

A power swivel for rotating a tubular string to form a borehole in a subterranean formation, the power swivel comprising:

• a gear box including a housing;
• a bonnet coupled to the housing;
• a motor;
• a stem coupled to the motor and the gear box to rotate the stem about a rotational axis, wherein the stem is configured to be coupled to the tubular string;
• a washpipe assembly in fluid communication with the stem, wherein the washpipe assembly includes a central axis and comprises:
• a washpipe including an upper end, a lower end opposite the upper end, a radially outermost cylindrical surface disposed between the upper end and the lower end, and a connection profile disposed between the radially outermost cylindrical surface and the upper end;
• a lower packing assembly coupled to the stem, wherein the lower packing assembly includes a seal assembly that further includes a plurality of annular seal members each including a body comprising an elastomer and a contact insert comprising a polymer and mounted to the body, wherein the contact insert is sealingly engaged with the radially outermost cylindrical surface of the washpipe;
• and
• an upper packing assembly coupled to the bonnet, wherein the upper packing assembly includes a connection profile that is mated with the connection profile of the washpipe such that the washpipe is prevented from rotating about the central axis relative to the upper packing assembly.