Heavy Weight Spiral Drill Collars / Drill Pipe Api Oil Drilling Grade S135

MOQ： 1 pc
Price： Negotiable
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Payment Terms	L/C, D/A, D/P, T/T, Western Union
Supply Ability	1000 pcs per month
Delivery Time	Within 8 days after deposit
Packaging Details	Pallet or wooden case
Material	Alloy Steel
Model	NC23-31
OD(mm)	79.4
ID(mm)	31.8
L(m) ±152.4mm d	9.14
DF(mm) ±0.4	76.2
Brand Name	TR Solids Control
Model Number	NC23-31
Certification	API Certificate, ISOCertificate
Place of Origin	Xi'an China

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Product Specification


Payment Terms	L/C, D/A, D/P, T/T, Western Union	Supply Ability	1000 pcs per month
Delivery Time	Within 8 days after deposit	Packaging Details	Pallet or wooden case
Material	Alloy Steel	Model	NC23-31
OD(mm)	79.4	ID(mm)	31.8
L(m) ±152.4mm d	9.14	DF(mm) ±0.4	76.2
Brand Name	TR Solids Control	Model Number	NC23-31
Certification	API Certificate, ISOCertificate	Place of Origin	Xi'an China
High Light	drilling accessories tools ，drill accessories kit

Spiral Drill collar

The major function of spiral drill collar: It is to prevent drilling tools from pressure differential block during drilling, the spiral groove allows the mud flow freely around the drill collar to balance pressure preventing pressure block, so effectively avoid bit sticking from differential pressure. Spiral collar can also reduce the contact area between the wall and tubular body, so as to avoid from sticking phenomenon of drill string.

Product Description

Product Description
API 7 Oil Well Drilling Spiral Non-Magnetic Drill Collar
1) Standard: API Spec 7
2) API and ISO certified

3) Specification: 3-1/8'', 3-1/2'', 4-1/8'', 4", 4-3/4'', 5'', 6" 6-1/4", 6-3/4", 7", 7-1/4", 7-3/4", 8", 8-1/4", 9", 9-1/2", 9-3/4", 10", 11"

4) Material: Alloy Steel
5) Description
A drill collar is a device used in the drilling of oil wells for weighting the drill bit, enabling it to drill through rock. It is a bar made of solid steel, either plain carbon steel or a non-magnetic steel alloy, drilled lengthwise to permit the passage of drilling fluids. A drill collar forms the lowest element of a drill string, which encompasses all the elements of a down-hole process from the surface to the rock bit.
6) Structure
These devices are typically 31 feet (about 9.45 m) long and threaded at both ends, male at one end and female at the other, to allow multiple drill collars to be joined above the bit assembly.
The number of drill collars attached to a drill string will depend upon the material composition of the strata at the drill site and the likely depth of the well. A relatively shallow well with less dense geologic structure through which the bit must pass will require fewer drill collars than a deep shaft through dense material.
Typically, drill collars will be consistent in length but may vary in diameter, and their outside configuration may be slick or spiral. The outside diameter may vary from about 3-1/2 inches (8.89 cm) to 11 inches (27.9 cm) and greater. The reference to slick or spiral outer configuration refers to the machining of the outside surface of the collar.
7) Characteristic of Non-mechanical Drill Collar
Materials of Non-magnetic drill collars are made from chrome manganese low carbon austenitic alloy, which has following characteristic:
a. The chemical composition should be controlled strictly during the refining and forging process.
b. With excellent lower Magnetic permeability, high strength of mechanical properties and outstanding resistant to stress corrosion cracking and no tendency to galling.
8) Parameter

Type	OD(mm)	ID(mm)	L(m) ±152.4mm d	DF(mm) ±0.4
NC23-31	79.4	31.8	9.14	76.2
NC26-35	88.9	38.1	9.14	82.9
NC31-41	104.8	50.8	9.14or9.45	100.4
NC35-47	120.6	50.8	9.14or9.45	114.7
NC38-50	127	57.2	9.14or9.45	121
NC44-60	152.4	57.2	9.14or9.45	144.5
NC44-60	152.4	71.4	9.14or9.45	144.5
NC46-62	158.8	57.2	9.14or9.45	149.2
NC46-62	158.8	71.4	9.14or9.45	150
NC46-65	165.1	57.2	9.14or9.45	154.8
NC46-65	165.1	71.4	9.14or9.45	154.8
NC46-67	171.4	57.2	9.14or9.45	159.5
NC50-70	177.8	57.2	9.14or9.45	164.7
NC50-70	177.8	71.4	9.14or9.45	164.7
NC50-72	184.2	71.4	9.14or9.45	169.5
NC56-77	196.8	71.4	9.14or9.45	185.3
NC56-80	203.2	71.4	9.14or9.45	190.1
6-5/8REG	209.6	71.4	9.14or9.45	195.6
NC61-90	228.6	71.4	9.14or9.45	212.7
7-5/8REG	241.3	76.2	9.14or9.45	223.8
NC70-97	247.6	76.2	9.14or9.45	232.6
NC70-100	254	76.2	9.14or9.45	237.3
8-5/8REG	279.4	76.2	9.14or9.45	266.7
NC50-67	171.5	71.4	9.14or9.45	159.5

9) Mechanical Property

OD Size	Yield Strength σ0.2 Mpa(psi)	Tensile Strength σb Mpa(psi)	Elongation δ4%	Reduction of area %	Reduction of area %
3-1/8~6-3/4	≥758 -110,000	≥827 -120,000	≥18	50	≥50
7~10	≥689 -100,000	≥758 -110,000	≥20	50	≥50

Company Details

Bronze Gleitlager

Bronze Sleeve Bushings

and

Graphite Plugged Bushings

from Quality China Factory



Business Type:

Manufacturer 


Year Established:

2010 


Total Annual:

40 Million-50 Million


Employee Number:

350~450 


Ecer Certification：

Verified Supplier 

Xi'An TianRui Petroleum Machinery Equipment Co.,Ltd. (For short: TR Solids Control) is a professional manufacturer of solids control equipment and mud recovery system, located in Xi'an City, China. Since 2010, TR Solids Control focused on the development and production of... Xi'An TianRui Petroleum Machinery Equipment Co.,Ltd. (For short: TR Solids Control) is a professional manufacturer of solids control equipment and mud recovery system, located in Xi'an City, China. Since 2010, TR Solids Control focused on the development and production of...

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Xi'an TianRui Petroleum Machinery Equipment Co., Ltd.
No.10 West of North Second Rig, Weiyang District, Xi’an City, China
https://www.drillingmud-system.com/

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