DOSECC

Hybrid Coring System

The DOSECC Hybrid Coring System (DHCS) is designed to collect continuous core to depths approaching 20,000 feet (6000 m). This unique diamond coring system is attached to a conventional rotary drill rig. The DHCS is hydraulically driven and uses modular components for its feed cylinder, rotating head, power pack, wireline winch and mud pumps. The rotating head has a dynamic capacity of 185,000 lbs. and is attached to a hydraulic feed cylinder that is hung from the traveling block of the rotary rig. This assembly is stabilized by floor to crown tensioned guide cables. During coring operations, standard wireline coring rods are used with a thin-kerf diamond bit that drills a nominal 4-inch hole and recovers core with a diameter of about 2.5 inches. The core barrel is retrieved by a wireline winch; an operation that allows the rods and coring assembly to remain at the bottom of the hole. The rotary rig is used in its standard configuration to open the hole, set casing, trip drill rods and perform cementing operations. During these operations, the DHCS is set back in the derrick, out of the way of other activities.

The DHCS is designed for ease of shipping and is packed into three 20 foot and one 40 foot shipping containers. It is suited for remote operations with the containers housing a workshop and a spare parts inventory. The system can be accommodated by a large variety of host rotary rigs.

• See Rig Specifications on specifics of DHCS components.
• See Rig Photos for Photos taken during drilling projects.

DHCS Rig Specifications

SPECIFICATIONS OF POWER PACK

• Detroit Series 60 Model #6064-GK33 450 HP Diesel
• Electronic Engine Management System
• 24 VDC Electrical and Air Compressor
• Diesel-Hydraulic Power Pack
• Containerized, Skid Mounted
• 500 gallon (1,892 liter) Fuel Reservoir
• Dual Air/Oil Coolers – Thermostatically Controlled
• High Pressure and Return Filtration System (5 Micron)
• Remote Digital Engine monitoring at Control Console

SPECIFICATION OF MUD PUMPS

• 2 - FMC Triplex Plunger Pump Model #M1620:
  Hydraulically Driven 90 gpm (342 lpm) at 350 rpm
  1990 psi (137 x105 pa) Max.
• 1 – FMC Triplex Piston Pump Model #L1118:
  Hydraulically Driven 27 gpm (102 lpm) at 640 rpm
  1200 psi (82 x105 pa) Max

SPECIFICATION OF TOP DRIVE

• Variable Hydraulic/2 Speed Gear Box
• 185,000 lb (83,915 kg) Dynamic Capacity
• 250,000 lb (112,500 kg) Static Capacity
• 0 – 900 rpm Variable Torque/Speed
• 4 in (10.16 cm) IF Pin Down Floating Spindle
• King 2.5 BL Swivel
• Kelly Valve 5000 psi ( 137 x105 pa) 4 in (10.16 cm) IF Pin Down
• 4 - 1.25 in (31.75 mm) Diameter Guide Cable Arms

SPECIFICATION OF FEED CYLINDER

• 25 ft (7.62 m) Stroke; 12 in (0.3 m) Bore; 5.5 in (13.97 cm) Rod
• 250,000 lb (112,500 kg) Capacity
• Elevator Upper Connection 3.50 in (8.89 cm) D.P.
• Load Cell Lower Connection to Top Drive Frame

SPECIFICATION OF WIRELINE WINCH

• Hydraulically Driven
• Capacity 20,000 ft (6,096 m) of 0.472 in (12.1 mm) Cable
• 323 ft/min (98.5 m/min) Bare Drum
• 440 ft/min (134.1 m/min) Full Drum
• 20,454 lb (9,204 kg) Pull Bare Drum
• 15,244 lb (6,860 kg) Pull Full Drum
• Hydraulic Failsafe Brake
• Manual Band Brake

SPECIFICATION OF CONTROL CONSOLE

• Electronic Control for all Coring Functions
• Skid Mounted for Rig Floor Placement
• Enclosed – Air Conditioned Doghouse

SPECIFICATIONS OF INSTRUMENTATION

• Wireline Counter, Rate and Weight Indicator
• String/Weight on Bit
• Rotation, rpm
• 2 – Pump, gpm
• Hydraulic Feed Pressure, Mud Pump Pressure
• Drill Head Position/Feed Rate
• Digital Display and Recording

SPECIFICATIONS OF SUPPORT EQUIPMENT

• Shop Container:
  • Hand and Power Tools
  • Hydraulic Hose Crimper
  • Lighting and Power Distribution Part Container with Inventory
  • 2,000 gallon (7,600 liter) Batch Cementing Unit - Hydraulically Driven