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Roller kelly bushing
Casing bushing
|
Roller Kelly Bushing
General
Roller Kelly Bushings are designed and manufactured as per API Spec 7K "Drilling and Well Servicing Equipment" for driving Kelly in the drilling operation.
Roller kelly bushings are constructed in upper body half, low body half, rollers, rollers pin and etc., can be available in square drive or pin drive. Square drive roller kelly bushing designed with taper contact surface in low body half, while pin drive roller kelly bushing designed with pin to be installed in low body half.
According to torque of drilling, roller kelly bushing can be available in heavy duty, medium duty and light duty, heavy duty bushings are for high torque and high speed drilling operations while medium duty and light duty are for medium or shadow depth drilling operations.
Roller kelly bushings can accommodate square Kelly or hex Kelly, for square Kelly, the bushing is designed with four flat rollers, and for hex Kelly, the bushing is designed with two V-shaped rollers and two flat rollers. By changing roller size, roller kelly bushing can accommodate square Kelly from 2½" to 5¼" or hex Kelly from 3" to 6", and can be installed in rotary table range from 17½" to 37½".
Specification of Roller Kelly Bushing
Model |
HDS |
27-HDP |
20-HDP |
MDS |
27-MDP |
17-MDP |
LDS |
For
square kelly |
3"~6" |
3"~6" |
3"~6" |
2½"
to 5¼" |
2½"
to 5¼" |
2½"
to 5¼" |
2½"
to 5¼" |
For
hex kelly |
3"~6" |
3"~6" |
3"~6" |
3" to
4¼" |
3" to
4¼" |
3" to
4¼" |
3" to
4¼" |
Drive
model |
Square |
Pin |
Pin |
Square |
Pin |
Pin |
Square |
Product photo of Roller Kelly Bushing
HDS |
HDP |
 |
 |
Exploded
figure for
HDS Roller Kelly Bushing
The
square dimension of
square drive roller kelly
bushing is 342.9 (0~-0.40)×342.9(0~-0.40)
and contact taper
is 1:3(9°27′45″)
HDS |
Description |
 
|
|
S.N. |
Description |
Qty |
|
1 |
Hold down nut |
4 |
|
2 |
Lock washer |
4 |
|
3 |
Hold down bolt |
4 |
|
4 |
Upper body half |
1 |
|
5 |
Lower body half |
1 |
|
6 |
Thrust washer |
8 |
|
7 |
O-ring seal |
8 |
|
8 |
O-ring |
8 |
|
9 |
Sheave bearing |
4 |
|
10 |
Flat roller |
2 |
|
11-a |
V- roller |
2 |
|
11 |
Screw pin |
4 |
|
12 |
Grease fitting |
4 |
|
13 |
Roller pin |
4 |
|
14 |
Pin |
8 |
|
Exploded
figure for
HDP Roller Kelly Bushing
HDP |
HDS |
  |
|
S.N. |
Description |
Qty |
|
1 |
Hold down nut |
4 |
|
2 |
Lock washer |
4 |
|
3 |
Hold down bolt |
4 |
|
4 |
Upper body half |
1 |
|
5 |
Retainer ring |
4 |
|
6 |
Lower body half |
1 |
|
7 |
Pin |
4 |
|
8 |
O-ring seal |
8 |
|
9 |
O-ring |
8 |
|
10 |
Thrust washer |
8 |
|
11 |
O-ring seal |
8 |
|
12 |
O-ring |
8 |
|
13 |
Sheave bearing |
4 |
|
14 |
Roller |
4 |
|
15 |
Screw pin |
4 |
|
16 |
Grease fitting |
4 |
|
17 |
Roller pin |
4 |
|
18 |
Thrust washer |
8 |
|
Contact
dimension
of pin drive
roller
Kelly bushing and pin drive master bushing:
|
Nominal size for rotary table |
L |
D |
|
in |
mm |
±1/16in |
±1.588mm |
±0.005in |
±0.127mm |
|
17½ |
444.5 |
19 |
482.6 |
2.472 |
62.79 |
|
20½ |
520.7 |
23 |
584.2 |
2.472 |
62.79 |
|
27½ |
696.5 |
25% |
654.05 |
3.265 |
82.93 |
|
37½ |
952.5 |
25% |
654.05 |
3.265 |
82.93 |
|
