D Miningwell 26 Inch Drill 12 1/4 Second Hand Bits Tricone Roller Bit for Minimg

Product Description

Advantages of roller cone bits:

1. High-strength and high-toughness carbide teeth are used to improve the impact resistance of the teeth and reduce the tooth
breakage rate;
2. The optimally designed tooth row number, tooth number, exposed tooth height and unique alloy tooth shape give full play to the
cutting ability and cutting speed of the drill bit;
3. Widely used in petroleum exploration, mining exploration, geothermal wells, hydrological exploration and other fields.
Our company can provide specific solutions according to the actual drilling situation, and customize assembled drill bits of any
diameter, including large-diameter machine pile drill bits, different types of drill bits, reaming bits, directional drilling
bits, etc.
 

Table of classification of formation hardness and bit selection
Roller cone bit	IADC code of diamond bit	Formation description	Rock type	Compressive strength(Mpa)	ROP(m/h)
IADC code
111/124	M/S112~M/S223	Very soft:sticky soft formation with low compressive strength.	Clay	<25	>20
			Siltstone
			sandstone
116/137	M/S222~M/S323	Soft:soft formation with low compressive strength and high drillability.	Clay rock	25~50	10~20
			Marl
			Lignite
			sandstone
417/527	M/S323~M/S433	Medium soft:soft to medium formation with low compressive strength and steak.	Clay rock	50~75	5~15
			Marl
			Lignite
			Sandstone
			Siltstone
			Anhydrite
			Tuff
517/537	M322~M443	Medium:medium to hard formation with high compressive strength and thin abrasive streak.	Mudstone	75~100	2~6
			Dark rock
			shale
537/617	M422~M444	Medium hard:hard and dense formation with high compressive strength and medium abrasiveness.	Dark rock	100~200	1.5~3
			Hard shale
			Anhydrite
			Sandstone
			Dolomite

 

IADC CODE SELECTION
IADC	WOB	RPM	Application
	(KN/mm)	(r/min)
111/114/115	0.3-0.75	200-80	very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk
116/117	0.35-0.8	150-80	very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk
121	0.3-0.85	200-80	soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone
124/125		180-60
131	0.3-0.95	180-80	soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds
136/137	0.35-1.0	120-60
211/241	0.3-0.95	180-80	medium formations with high compressive strength, like medium, soft shake, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbeds.
216/217	0.4-1.0	100-60
246/247	0.4-1.0	80-50	medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite
321	0.4-1.0	150-70	medium abrasive formations, like abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble
324	0.4-1.0	120-50
437/447/435	0.35-0.9	240-70	very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk, gypsum, salt, soft limestone
517/527/515	0.35-1.0	220-60	soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone
537/547/535	0.45-1.0	220-50	soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds
617/615	0.45-1.1	200-50	medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite
637/635	0.5-1.1	180-40	hard formation with high compressive strength, like limestone, sandstone, dolomite, hard gypsum, marble
Note: Above limits of WOB and RRPM should not be used simultaneously

 

Q1: Wonder if you accept small orders?

A1: Do not worry. Feel free to contact us .in order to get more orders and give our clients more convener ,we accept small order.

 

Q2: Can you send products  to my country? 

A2: Sure, we can. If you do not have your own ship forwarder, we can help you. 

 

Q3: Can you do OEM for me?

A3: We accept all OEM orders,just contact us and give me your design.we will offer you a reasonable price and make samples for you ASAP.

 

Q4: What's your payment terms ?

A4: By T/T,LC AT SIGHT,30% deposit in advance, balance 70%  before shipment.   

 

Q5: How can I place the order?

A5: First sign the PI,pay deposit,then we will arrange the production.After finished production need you pay  balance. Finally we will ship the Goods.

 

Q6: When can I get the quotation ?

A6: We usually quote you within 24 hours after we get your inquiry. If you are very urgent to get the quotation.Please call us or tell us in your mail, so that we could regard your inquiry priority.