Nomenclature of Kingdream roller cone bits for oil well drilling

    1 Bit diameter code: indicated by numbers (integer or fraction). The numbers indicate diameter of the bit in inches.
    2 Bit series code: for tri-cone bit, 9 standard series are designated based on main features of the bearing and sealing structures. Apart from bearing and seal, a major modification to bit structure will be defined as a special structure, and standard series plus special structure or the combination of special structures makes the special series. The series code of single cone bit is indicated by "Y*". "Y" means one cone, and "*" is the design number, which indicates different design features. The series codes of oil well drilling bits are shown in the following table.

    Series codes of oil well drilling bits:

    3 Bit classification code: According to the regulations in SPE/IADC 23937, bit classification code consists of three digits, the first digit stands for cutting structure and formation code, the second one stands for stratigraphic classification code, and the last digit stands for rock bit structure feature code.
    4 Additional structure features of the bit: When bits need to be improved or to be reinforced to meet the special requirement of drilling application and formation, the additional structure features indicated by one or more letters will be added to the classification code. See the following table:


    Table: Additional structure features of the bit

    For example: an 8-1/2 HJT537GL tri-cone bit
    8 1/2: Bit diameter is 8-1/2 inches (215.9mm);
    HJT: Metal face sealed journal bearing, special gage protection;
    537: Insert bit for drilling in soft to medium hard formation with low compressive strength;
    G: Reinforced bit head OD;
    L: Bit head OD stabilization pad.

    Kingdream Roller Cone Bit for Shallow Oil Well Drilling

    Kingdream roller cone bits for shallow oil well drilling are manufactured by Shanghai Kingdream Sub-company. The product sizes are from 8-1/2" to 26" including 3 series and nearly 200 types. Bit sizes from 8-1/2" to 12-1/4" are suitable for drilling upper sections within 2,000 meters depth, while bit sizes from 13-5/8" to 26" can be used to drill various formations from soft to extremely hard.

    Nomenclature of Kingdream roller cone bits for shallow oil well drilling

    1 Bit diameter code:indicated by numbers (integer or fraction). The numbers indicate diameter of the bit in inches.
    2 Bit series code:for tri-cone bit, three standard series are designated based on main features of the bearing and sealing structures. Apart from bearing and seal, a major modification to bit structure will be defined as a special structure, and standard series plus special structure or the combination of special structures makes the special series, as shown by the following table:

    table: Kingdream Roller Cone Bit for Shallow Oil Well Drilling