III. Liner Systems - e.6. Tieback Mill Assembly

Allamon Tool Company’s Tieback Mill assembly incorporates two mills for preparing an existing liner top to accept a tieback seal stem. The lower mill is made of bronze and is used to polish the ID of the tieback while not damaging the seal bore surface. The top mill is used to mill away undesirable cement at the liner top and to shape the tieback sleeve for seal stem stabbing. The mill assembly incorporates a drill pipe connection on bottom so that a clean out work string and bit can be run inside the liner top during tieback cleanout run. Tieback Mill Assembly Tieback Sleeve ID (in.) Top Dress Mill OD (in.) Polishing Mill OD (in.) Top Connection (in.) Bottom Connection (in.) 5.750 5.190 3-1/2 IF 3 Stub Acme 5.500 5.750 5.440 3-1/2 IF 3 Stub Acme 5.750 6.325 5.690 3-1/2 IF 3 Stub Acme 7.375 8.250 7.315 4-1/2 IF 4-1/4 Stub Acme 7.625 8.250 7.565 4-1/2 IF 4-1/4 Stub Acme