BITART type 310 and modifications


It is designed for separating spacer fluid and cement slurry squeezed to annular space during casing cementing. It provides cleaning of casing inner surface from cement slurry residues as well as leak-proof fit to back valve and cementing process end signal.


It is equipped with high-strength plastic core covered with elastomeric coat made from wear resistant polymer material.

Five-petal design provides stable running in string with firm separation of spacer fluid from cement slurry without loss of tightness across the whole squeezing interval.

Qualitative casing inner wall cleaning is achieved by means of specially designed geometry of cement plug and foremost by means of special form of petals, its quantity and location.

The use of modern high quality polymer materials allows plug standing high pressure differential excluding the possibility of its destroying during landing to back valve and ensuring the receiving of cementing process end signal at the surface.

However, the high strength capacities the used materials provide easy drilling-out using PDC bit and do not inflict damages to the bit.

Example of conventional designation at the time of order:

BITART type XXX top cement plug for OK YYY mm where, 
OK casing;
XXX type (modification) of device;
YYY casing diameter.

Advantages (features):

  • Design is fully adapted for drilling-out with PDC bit;
  • Under development the shoe valve unit was tested by differential pressure of 20MPa (200atm.);
  • Presence of additional option rotation retention mechanism Safe Lock allows excluding cement plug rotation during drilling-out, facilitate drilling-out process, and reduce well construction time;
  • Used materials are compatible for operations in environments with liquid fuels, oils, petrol etc. content.

Additional options:

  • Rotation retention mechanism Safe Lock prevents cement plug rotation during drilling-out (option available for plugs from 168,28mm (6 5/8) to 339,70mm (13 3/8);

* The use of plugs with Safe Lock option is possible only with corresponding equipment also equipped with Safe Lock option.

Modifications of top plugs BITART:

Additional options
BITART type 310
BITART type 311
Base version
Rotation retention mechanism Safe Lock
- +

Technical characteristics:

Top cement plugs BITART type 310 are produced for casing cementing in diameters from 114,30mm (4 ½ in) to 339,70mm (13 3/8 in).

Base variant of top cement plug - BITART type 310. At customers option the top cement plug BITART type 310 can be equipped with additional options not included to the base set and come in the following modifications: BITART type 311.

Technical characteristics of top cement plugs BITART type 310, 311:

Parameter Value
Casing OD, mm
114,30 146,05 168,28 177,80 244,48 323.85  339.70
Max. OD, mm
220,00 222,00 232,00 235,00 250,00 340,00
Min. ID after drilling-out, mm
110,50 140,00 161,50 171,00 235,00 314,00
Diameter of body circulation holes, mm
20,00 20,00 20,00 20,00 15,00 10,00
Max. operating temperature, C 130,0
Weight, kg
2,5 4,0 5,0 6,0 9,0 15,0  20,0