Designation:

It designed for fitting bottomhole assembly for the purpose of its direction along the wellbore and protection from damage during well construction of difficult wells.

Equipping:

It is equipped with eccentric plastic guide plug, which rotates during casing running. Rotating in the direction of least resistance the guide plug orients the shoe during running operations allowing bypassing obstacles facilitating casing RIH in difficult wellbore sections, sharp bends and curvatures.

Eccentric plug has three circulation holes directed apart fro provision qualitative flushing. Body of the shoe has three additional side circulation holes.

For the cases when during casing RIH the priority is circulation through central holes only there is shoe modification where side circulation holes closed by bursting discs. In case of central holes plugging the side holes are opened. This happens by means of creation over pressure in casing. When specific pressure value is reached discs are destroyed and circulation goes through created holes. Easy drilling polymer materials are used in producing shoes. This allows drillingout using PDC bit without any damages to the bit.

Example of conventional designation at the time of order:

BITART type XXX shoe with eccentric free rotating plastic guide plug for OK YYY thread ZZZ where, 

OK – casing;
XXX – type (modification) of device;
YYY – casing diameter;
ZZZ – type of tool joint.

Advantages (features):

• Design is fully adapted for drilling-out with PDC bit;
• Rotating in the direction of least resistance the guide plug orients the shoe during running operations allowing bypassing obstacles providing uninterrupted casing or liner RIH;
• The eccentric plastic guide plug is resistant to high axial compression and bending loads;
• Presence of additional option “side holes adjustable opening pressure” allows casing RIH with high efficiency flushing through central holes in guide plug with no risk of accidents connected with loss of circulation due to shoe plugging.

Modifications of shoe with eccentric free rotating plastic guide plug BITART:

Technical characteristics:

Shoes with eccentric free rotating plastic guide plug BITART type 150 are produced for equipping casings in diameter 101,60mm (4 in) up to 244,48mm (9 5/8 in), can be produced with the following types of tool joints: buttress thread under GOST 632-80, buttress thread under API 5B and premium threads TMK FMC, TMK GF, TMK PF, TMK PF ET, VAM TOP.

The base version of shoe – BITART type 150. At customer’s option BITART type 150 can be equipped with additional options not included to the base set and can be produced in modification BITART type 151.

Additional options:

“Side holes adjustable opening pressure” – during RIH the circulation goes through central holes of shoe guide plug; the side holes are closed by bursting discs, which if necessary can be activated by means of creation over pressure in casing.

Technical characteristics of shoe with eccentric free rotating plastic guide plug BITART type 150, 151:

*parameter for shoes BITART type 151