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Factory Price 22 Inch IADC 517 Api Tci Tricone Drill Bit Oil Well Direction Rock Drilling

Factory Price 22 Inch IADC 517 Api Tci Tricone Drill Bit Oil Well Direction Rock Drilling


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Product Description

Product Description

Basical Specification
Size of tricone bit	22 inch 558.8mm
Connection	7 5/8" Reg pin
IADC code	517 537
Bearing	Journal /roller
Sealed	rubber or metal sealed
Operating Parameters
WOB (Weight On Bit)	0.35~1.05 KN/mm (bit Dia.)
Rotary speed	110~40 r/min
Make up torque	8.5~12.2 KN.M
Formation	Medium formation with high compressive strength ,and high drillability ,such as mudstone, gypsum,salt,soft limestone,etc.

Optimal test method for drilling parameters

Drill for 5 minutes with initially selected proper WOB and moderate RPM (60~100r/min) and record the ROP (as shown in the table below).
Moderately inctease WOB and keep the same RPM and drill under this WOB for 5 minutes and again record the RPO (as shown in the table below).
Decrease WOB b the same extent and tepeat step 2.
Find the WOB in the tow groups of test than can yield highest ROP.
Properly change RPM under optimal WOB and record the ROP (as shown in the table below).
Select the RPM at the highest ROP.
Set the drilling parameter at the best combination:60KN RPM: 120r/min 

Times	RPM:100r/min		WOB:60KN
Times	WOB (KN)	Drilling hour (min/m)	RPM (r/min)	Drilling hour (min/m
1	80	8	100	7
2	100	9	120	5.5
3	60	7	80	8
Select	60	7	120	5.5

IADC code	WOB (KN/mm)	RPM (r/min)	Applicable Formations
437/447/435	0.35~0.9	240~70	Very soft formations with low compressive strength and high drillability,such as clay,mudstone,chalk,gypsum,salt,soft limestone, etc.
517/527/515	0.35~1.0	220~60	Soft formations with low compressive strength and high drillability,such as mudstone,gypsum,salt,soft limestone, etc.
537/547/535	0.45~1.0	220~50	Soft to medium formations with low compressive strength, such as medium, soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds, etc.
617/615	0.45~1.1	200~50	Medium hard formation with high compress strength, such as hard shale, limestone, sandstone, dolomite. etc
637/635	0.5~1.1	180~40	Hard formations with high compressive strength, such as sandstone, limestone, dolomite ,hard gypsum, marble, etc.