DC Electric Drilling Rig 1. ZJ40~ZJ70 RIG 2.conform to the API specification 3.Adopting advanced AC-SCR-DC technology DC Electric Drilling Rig Technical characteristics*Adopting advanced AC-SCR-DC technology;*Both swing lift and sling-shot parallel-integrated substructures with 9m and 10.5m floor height are optional. All parts on rig floor and mast are installed on ground and raised with drawworks power;*Main brake of drawworks can be hydraulic disc brake or band brake;*Rotary table is driven by drawworks power through compound drive or by an independent motor. In addition, emergency device is provided to drive rotary table via drawworks one in emergency for reliable drilling operations;*Logic control, supervision and maintenance during complete drilling operations are available by PLC processes. The drilling data can be stored, printed and remote transmitted. All operations by driller can be completed in the cabin for better working conditions and less working strength;*Top drive drilling system can be equipped;*Integrated skid rail may be provided to meet requirements for cluster well drilling. Technical parameters 

Drilling rig model		ZJ40/2250 D	ZJ50/3150 D		ZJ70/4500D
Nominal drilling depth, m	114mm(4½") drill pipe	2500-4000	3500-5000		4500-7000
	127mm(5") drill pipe	2000-3200	2800-4500		4000-6000
Max. hook load, kN(t)		2250	3150		4500
Hook speed, m/s		0-1.44	0.21-1.39		0.21-1.36/0.25-1.91
Line strung of hoisting system		10	12		12
Drill line diameter, mm		32	35		38
Max. pull of fast line, kN		280	350		485
Drawworks	Model	JC40D	JC50D		JC70D
	Power rating, kW(HP)	735	1100		1470
	Speed	4	4		4
Main brake		Hydraulic disc brake
Auxiliary brake		Eddy or pneumatic air cooled disk brake
Crown block		TC225	TC315	TC450
Traveling block		YC225	YC315	YC450
Sheave OD of hoisting system, mm(in)		1120	1270	1524
Hook		DG225	DG315	DG450
Swivel	Model	SL225	SL450	SL450
	Stem dia., mm	75	75	75
Rotary table	Table opening, mm(in)	698.5	952.5	952.5
	Speed	I or  II, smooth change
	Drive mode	Independent electric drive or compound drive
Mast	Type	K
	Height, m	43	45
	Max. load, kN	2250	3150	4500
	Racking board height, m	24.5,25.5,26.5
Substructure	Type	Swing lift or sling-shot
	Floor height, m	7.5	9	9		10.5
	Clear height, m	4.8	7.6	7.6		9
Mud pump	Model × number	F-1300×2	F-1600×2	F-1600×3
	Drive mode	DC electric
Electric drive mode		AC-SCR-DC, one for one or one for two control

DC Electric Drilling Rig