Description

Roller Kelly Bushing
 Square drive Roller Kelly bushing

1.Description
⑴Square drive Roller Kelly bushing is designed for driving Kelly in the drilling operation.
⑵Roller Kelly bushing can be square drive or pin drive, and can be applicable for rotary table size from 17½ to 37½. By changing roller sizes, the bushing can accommodate square kellys from 2½ to 5¼ or hex kellys from 3 to 6. Roller Kelly bushing has three series: SD(light duty), MD(medium duty) and HD(heavy duty).
⑶All technical data and properties of Roller Kelly bushing conform to the requirements of API Spec 7K.

2.Structure
Square drive Roller Kelly bushing consists of lower body half, upper body half, roller, roller pin and etc. when the bushing is installed to square kelly or hex kelly, the square part of the lower body half can be fitted in the square of the master bushing. When operating, the rotary table drive master bushing and master bushing drive Roller Kelly bushing and Roller Kelly bushing drive square kelly or hex Kelly to rotate, such is the torque transporting. The lower body half is conically shaped to readily enter the bore of the master bushing and automatically center bushing and drill string within the bore of the master bushing. Inside rollers are journal bearings which are fitted to the roller pin, when kelly rotates and moves downward, the rollers rotates with Kelly, such change sliding friction to rolling friction and minimize the abrasion of the kelly. The bushing is equipped with mud-scrapper assembly to clean the mud.

3.Specifications for Square drive Roller Kelly bushing
Chart for specifications of Square drive Roller Kelly bushing:

Specification

HDS

MDS

LDS

square kelly

3in-6 in

2½in -5¼ in

2½in -5¼ in

hex kelly

3in -6 in

3 in -4 ¼ in

3 in -4¼in

Type

Heavy duty

Middle duty

Light duty

 Pin Drive Roller Kelly bushing

1.Description
⑴Pin drive Roller Kelly bushing is designed for driving Kelly in the drilling operation.
⑵Roller Kelly bushing can be square drive or pin drive, and can be applicable for rotary table size from 17½ to 37½. By changing roller sizes, the bushing can accommodate square kellys from 2½ to 5¼ or hex kellys from 3 to 6. Roller Kelly bushing has three series: SD(light duty), MD(medium duty) and HD(heavy duty).
⑶All technical data and properties of Roller Kelly bushing conform to the requirements of API Spec 7K.

2.Structure
Pin drive Roller Kelly bushing consists of lower body half, upper body half, roller, roller pin and etc. when the bushing is installed to square kelly or hex kelly, the square part of the lower body half can be fitted in the square of the master bushing. When operating, the rotary table drive master bushing and master bushing drive Roller Kelly bushing and Roller Kelly bushing drive square kelly or hex Kelly to rotate, such is the torque transporting. The lower body half is conically shaped to readily enter the bore of the master bushing and automatically center bushing and drill string within the bore of the master bushing. Inside rollers are journal bearings which are fitted to the roller pin, when kelly rotates and moves downward, the rollers rotates with Kelly, such change sliding friction to rolling friction and minimize the abrasion of the kelly. The bushing is equipped with mud-scrapper assembly to clean the mud.

3.Specifications for Pin drive Roller Kelly bushing
Chart for specifications of Pin drive Roller Kelly bushing:

Specification

27-HDP

20-HDP

20-MDP

17-MDP

square kelly

3 in-6 in

3in-6in

2½ in-5½ in

2½in -5¼in

hex kelly

3 in-6 in

3in-6in

3 in-4¼in

3in -4¼in

Type

Heavy duty

Heavy duty

Middle duty

Middle duty