Designation:

It designed for fitting bottomhole assembly for the purpose of its direction along the wellbore and protection from damage during running as well as preventing fluid or cement slurry backflow from annular space to string during cementing.

Equipping:

It is equipped with high-strength plastic guide plug resistant to high axial compressive and bending loads. Shoe mounted float-type back valve Real Seal II™ provides reliable pressurization of tube side both in directional and horizontal wells. Guide plug of the shoe has central circulation hole, and the additional side circulation holes are placed in shoe body. Modern polymer materials used in producing shoes allow standing continuous washover cycles with muds with high content of abrasive particles, and provide quick drilling-out using PDC bit without bit damages.

Example of conventional designation at the time of order:

BITART type XXX shoe with float back valve and 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;
• Under development the shoe valve unit was tested by back-pressure of 30MPa (300 atm.) and flushing fluid with high content of sand within 24 hours.
• Design of shoe mounted back valve provides ability of its use in well of any curvature;
• Presence of additional option “Auto fill-up” allows tripping-in casing without loss of time for periodic stops for casing fill-up;
• Presence of additional option “rotation retention mechanism Safe Lock™” allows excluding cement plug rotation during drilling-out, facilitate drilling-out process, and reduce drilling-out time.

Additional options:

• “Without side holes” – absence of additional side circulation holes in shoe body;
  
• “Auto fill-up” provides auto casing fill-up during tripping-in (option available for shoes from 168,28mm (6 5/8) to 339,70mm (13 3/8);
  
• “Rotation retention mechanism Safe Lock™” prevents cement plug rotation during drilling-out (option available for shoes from 168,28mm (6 5/8) to 339,70mm (13 3/8).
  

Shoe modification with float back valve and plastic guide plug BITART:

Technical characteristics

Shoes with float back valve BITART type 210 are produced for equipping casings in diameter 101,60mm (4 in) up to 339,70mm (13 3/8 in), can be produced with the following types of tool joints: buttress thread under GOST 632-80, buttress thread under API 5B.

The base version of shoe – BITART type 210. At customer’s option BITART type 210 can be equipped with additional options not included to the base set and can be produced in modification BITART type 211, 212, 213, 214, 215, 216, 217.

Technical characteristics of shoe with float back valve and plastic guide plug BITART type 210, 211, 212, 213, 214, 215, 216, 217:

*parameter for shoes BITART type 210,215,216,217.
*parameter for shoes BITART type 212,214,215,217.