Mobile Drliing Rigs by Bharat Heavy Electricals Limited

The IRI 900 Series drilling rig is designed for reliability, fast rig-up and efficient operation. Is is a performance proven drilling rig. It established its reputation as a mechanical drive rig and is available now in this design. However, the basic design has been expanded to offer a new possibility. 

An electric drive drawworks group has been developed using one 1000 HP traction motor for both drawworks and rotary drive. The electric drive rig is available as both a single and double drum drawworks. A split trailer version of the 900 rig has also been developed. The electric drive rig utilizes this trailer mount while the mechanical drive rig may be either self propelled or trailer mounted. the split trailer design separates the original mechanical self propelled rig into two loads to control package weights where permittable limits may cause problems. 

The drawworks trailer including the drawworks, its power group and the hydraulic power unit moves as a load. The mast on its own bogie moves with its hydraulic raising system, the reserve line spool and the travelling block in strung-up condition. As a mechanical drive self propelled rig, the two engine power package, compound drawworks, heavy duty rotary drive and deep section mast are unitized into one self propelled load. Either the trailer rig or the self propelled rig may be matched with a choice of single piece or multiple piece substructures with 17' floor height, reducing moving and rig-up time to a minimum. 

Mechanical Drive Arrangement Power:
Two engines totalling up to 950 horsepower at 2100 RPM provides single or two engine power to all rig functions, including hoisting, rotating, mud pump or roading. Engines are high mounted for convenient accessibility to encourage good preventive maintenance. Torque Converters
- Two converters individually matched to engines selected. Automatic lock-up feature in each converter for maximum efficiency. 

Transmission:
- Allison CLT 5961 in combination with converters. Synchronized full load shifting with five forward speeds and one reverse speed. Driller can instantly select the proper gear in any operation. The wide range of speeds available to the drawworks reduces dwell time between speed ranges and reduces total trip time. 

Compound:
- Integral with final drum drive. Idler adjusted high speed roller chain in oil bath case compounding each engine drive to drawworks drum shaft. 

Drawworks:
- Model 2346 large diameter drum barrel with 12" x 46" water circulating type brake rims bolted to drum. Full wrap single point adjusted, fully equalized brake bands. Outboard drum clutch for easy maintenance 10,000 single line pull parmac V-80 brake driven through overrunning coupling. 

Catworks:
- Hydraulic catworks including high capacity breakout cylinder spinning and make-up cylinder and planetary gear, self-locking handling winch for smooth, safer catheading operations. 

Drawworks Drive:
- Heavy-duty propeller shaft drive through two Model 450 right-angle gear boxes and compounding chains to drawworks drum shaft. Allows individual power transmission from either engine directly to drum shaft. 

Rotary Drive:
- Propeller shaft via full air rotary clutch, heavy-duty reverse gear box, and oil bath roller chain elevated rotary drive, unitized on back face of mast. Simple propeller shaft connection at rig-up and rig-down. Nominal max. rotary speed 220 RPM. Nominal table working torque-30,000 ft. lbs.