- Near-bit Stabilizers

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Drilling Tools: Near-bit Stabilizers

Near-bit Stabilizers

Near-bit stabilizers are designed for reaming the wellbore and improving downhole motor performance.

Ejection stabilizers are used for bore hole reaming, improved cuttings removal, ROP increase by means of restricting hydrostatic mud pressure and collimation of borehole walls. They are used in complicated geological environment with hole dragging, borehole wall collapse in medium and hard formations.

Application:

Drilling soft and medium abrasive formations (MC-type)

Drilling medium abrasive and hard formations (CT-type)

Design:

Bearing surfaces of the blades are hardfaced with wear-resistant material to prevent early wear. PDC cutters on the bearing surfaces improve durability of near-bit stabilizers.


Some Types of Near-bit Stabilizers:

Designation Size: mm / in PIN Size, “API REG Total
length, mm
Length of theBearing surface, mm
CT H171/M171 490 19 9/32 Box 6 5/8 Reg/ Box 6 5/8 Reg 1070 300
CTK M171/171 490 19 9/32 Pin 5 1/2 FH/Box NC50 761 300
CTK M171/171 490 19 9/32 Box 6 5/8 Reg/ Box 6 5/8 Reg 866 300
CTK H171/M171 393,7 15 1/2 Box 6 5/8 Reg/ Box 6 5/8 Reg 825 323
CTK M177/152 393,7 15 1/2 Box 7 5/8 Reg/ Box 6 5/8 Reg 390 179,6
CTK H171/M171 385 15 5/32 Box 6 5/8 Reg/ Box 6 5/8 Reg 825 323
CT M133/133 311,1 12 1/4 Box NC50/ Box NC50 655,4 300
CTK M152/147 311,1 12 1/4 Box 6 5/8 Reg/ Box 6 5/8 Reg 505 200,7
CTK M152/152 295,3 11 5/8 Box 6 5/8 Reg/ Box 6 5/8 Reg 395 225,8
CT M152/152 295,3 11 5/8 Box 6 5/8 Reg/ Box 6 5/8 Reg 671,8 300
CT M133/133 295,3 11 5/8 Box NC50/ Box NC50 639,6 300
CTK M152/152 295,3 11 5/8 Box 6 5/8 Reg/ Box 6 5/8 Reg 671,8 310,2
CTK M152/152 294 11 9/16 Box 6 5/8 Reg/ Box 6 5/8 Reg 395 227,1
CTK M152/H152 294 11 9/16 Box 6 5/8 Reg/ Box 6 5/8 Reg 483,4 225,8
CT H152/M152 294 11 9/16 Box 6 5/8 Reg/ Box 6 5/8 Reg 686,6 300
CT M152/152 294 11 9/16 Box 6 5/8 Reg/ Box 6 5/8 Reg 567,8 150
CT H152/M152 292 11 1/2 Box 6 5/8 Reg/ Box 6 5/8 Reg 683,1 300
CTK M152/147 292 11 1/2 Box 6 5/8 Reg/ Box 6 5/8 Reg 505 220
CTK H171/M171 290 11 13/32 Box 6 5/8 Reg/ Box 6 5/8 Reg 722 322
CTK M117/117 220,7 8 11/16 Box 4 1/2 Reg/ Box 4 1/2 Reg 295 150
CTK M117/H117 218,2 8 19/32 Box 4 1/2 Reg/ Box 4 1/2 Reg 526,2 149,2
CTK H147/M133 218 8 19/32 Pin 5 ½ FH/Box NC50 350,1 115
CTK M133/133 218 8 19/32 Box NC50/ Box NC50 386 150
CTK H133/M133 215,9 8 1/2 Pin NC50/ Box NC50 500 153,1
CTK M133/133 215,9 8 1/2 Box NC50/ Box NC50 386 153
CT M117/117 215,9 8 1/2 Box 4 1/2 Reg/ Box 4 1/2 Reg 480 290
CT M117/117 215,9 8 1/2 Box 4 1/2 Reg/ Box 4 1/2 Reg 622,8 300
CTK M117/117 215,9 8 1/2 Box 4 1/2 Reg/ Box 4 1/2 Reg 622,8 300
CT H133/M133 215,9 8 1/2 Pin NC50/ Box NC50 864,4 310
CTK M117/117 215,9 8 1/2 Box 4 1/2 Reg/ Box 4 1/2 Reg 295 150
CTK H147/M133 215,9 8 1/2 Pin 5 1/2 FH/Box NC50 350,1 117,1
CTK M117/H117 215,1 8 15/32 Box 4 1/2 Reg/ Pin 4 1/2 Reg 523 149,2
СТ М117/117 215,0 8 15/32 Box 4 1/2 Reg/ Box 4 1/2 Reg 476,3 150
CTK M117/117 214 8 7/16 Box 4 1/2 Reg/ Box 4 1/2 Reg 295 151,1
CTK H147/M133 213,5 8 13/32 Pin 5 1/2 FH/Box NC50 500 152,6
CTK M117/117 213 8 3/8 Box 4 1/2 Reg/ Box 4 1/2 Reg 295 152,1
CTK H147/M147 212,7 8 3/8 Pin 5 1/2 Reg/ Box 5 1/2 Reg 516 154
CTK M117/117 212 8 11/32 Box 4 1/2 Reg/ Box 4 1/2 Reg 295 153,1
CT H133/M133 187 7 3/8 Pin NC50/ Box NC50 500 152
CTK H88/M88 144 5 21/32 Pin 3 1/2 Reg/ Box 3 1/2 Reg 429 190
CTK H88/M88 142,9 5 5/8 Pin 3 1/2 Reg/ Box 3 1/2 Reg 433 222
CTK H88/M88 142,9 5 5/8 Pin 3 1/2 Reg/ Box 3 1/2 Reg 437 190
CT M88/88 142 5 19/32 Box 3 1/2 Reg/ Box 3 1/2 Reg 318,7 200
CTK H76/M76 124 4 7/8 Pin 2 7/8 Reg/ Box 2 7/8 Reg 378 152,7
CT H76/M76 123,8 4 7/8 Pin 2 7/8 Reg/ Box 2 7/8 Reg 410 210
CT M76/76 123,8 4 7/8 Pin 2 7/8 Reg/ Box 2 7/8 Reg 314 200
CT H76/M76 122,8 4 27/32 Pin 2 7/8 Reg/ Box 2 7/8 Reg 321 200
CTK H76/M76 121 4 3/4 Pin 2 7/8 Reg/ Box 2 7/8 Reg 378 152,7
CT H86/M86 120,6 4 3/4 Pin NC31/ Box NC31 630 210
CTK H66/M66 101 3 31/32 Pin 2 3/8 Reg/ Box 2 3/8 Reg 347 161
CTK H66/M66 95 3 3/4 Pin 2 3/8 Reg/ Box 2 3/8 Reg 336 161