MiniMD Series Roller Cone Drilling Bits for slim hole drilling applications
In addition to the features of MD motor bit, MiniMD slim hole bit is also designed with special bearing & seal structure and lubrication system. MiniMD bit’s cutter material and cutting structure are reasonably matches with rock properties of the formation and this eliminated the specific problems such as low drilling efficiency and cutter breakage and loss, etc.
MiniMD slim hole bit has structure features of metal face sealed and enhanced head O.D. protection, so that the bit is suitable for drilling slim hole and ultra-deep well drilling applications.
· MiniMD slim hole bit is the ideal choice for drilling slim hole sections in deep and ultra-deep well drilling applications.
· The size range of MiniMD series bit is 5 3/4 – 6 1/2 inch and its IADC code is 437 – 647.
High reliability and long working life
Bushing bearing with metal face seal
The series bit adopts advanced bushing bearing pair and reliable metal face seals to enhance reliability of the bit
New type of lubrication system
Precisely designed and processed lubrication system and the use of new type of synthetic grease can improve balancing speed of the pressures inside and outside of the bearing package and achieve better protection of the bearing and seal system of the bit.
Improve bit stability, prevent bit diameter shrinkage
and extend the bit’s working life
Inclined double-stable head O.D.
Improved stability of small size head O.D. and reduced bit vibration at the bottom hole are achieved by using specially designed inclined double-stable head body. Hydraulic system of the b仆is also opti而zed on the basis of the special head O.D. design an as a result, bottom flow field under the condition of insufficient hydraulic power in lower section in deep well is largely improved, removal of drilling cuttings is also improved and wear of the bit and other drilling tools by drilling cuttings is reduced and therefore, ROP is further improved.
(Optional features: D, H, X, V)
