API Spec 7-1 And SY/T5144 Standard Slick Spiral And Non-Magnetic
Drill Collars In Various Sizes For Petroleum Drilling
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Product overview:
The Drill Collar produced and sold by our company Huichi Petro is
one of the core tools in oilfield drilling operations. It is a
thick-walled, heavy-weight tubular drill bit that is connected
between the drill pipe and the drill bit and is an important part
of the drill string. It is mainly used to provide vertical drilling
pressure to the drill bit, maintain the stability of the wellbore
trajectory, and transmit rotational torque. Its high strength, wear
resistance and corrosion resistance make it an ideal choice for
deep wells, ultra-deep wells and complex formation drilling.
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Core functions:
- Weight-added guidance: Increase the weight of the bottom of the drill string through
high-density materials to ensure that the drill bit efficiently
breaks the rock and drills into the formation.
- Stabilize the wellbore: The rigid structure reduces the vibration and vibration of the
drill string, avoids well deviation, and improves drilling
accuracy.
- Torque transmission: Seamlessly connect the drill string system to ensure stable
transmission of power to the drill bit to achieve rock cutting and
crushing.
- Extreme environment resistance: Adapt to harsh drilling conditions such as high temperature, high
pressure, and corrosive mud.
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Technical parameters:
- Material: high-quality alloy steel (such as 4145H/4140), optional
nitriding/chrome plating surface treatment.
- Specifications: outer diameter 4.75"-11", length 9-10 meters, inner hole diameter
suitable for a variety of drilling tool combinations.
- Tensile strength: ≥965 MPa, yield strength ≥758 MPa.
- Connection thread: API standard NC, FH, etc., support customized buckle type.
- Customized service: drill collar products of different lengths and outer diameters can
be provided according to customer needs, ranging from 5 feet to 32
feet in length, and outer diameters ranging from 3-1/8" to 11".
| Specification | Outer diameter (mm) | Inner diameter (mm) | Code | Thread | Length (mm) | Ordering outer diameter (mm) | Ordering length (mm) | Gross weight (kg) | Finished product weight (kg) |
| 3-1/8 | 79.4 | 31.8 (1-1/4) | NC23-31 | NC23 | 9140 | 100 | 9600 | 592 | 298 |
| 3-1/2 | 88.9 | 38.1 (1-1/2) | NC26-35 | NC26 | 9140 | 110 | 9600 | 717 | 364 |
| 4-1/8 | 104.8 | 50.8 (2) | NC31-41 | NC31 | 9140/9450 | 120 | 9600 | 853 | 474/490 |
| 4-3/4 | 120.6 | 50.8 (2) | NC35-47 | NC35 | 9140/9450 | 130 | 9600 | 1001 | 674/697 |
| 5 | 127.0 | 57.2 (2-1/4) | NC38-50 | NC38 | 9140/9450 | 140 | 9600 | 1161 | 725/749 |
| 6 | 152.4 | 57.2 (2-1/4) | NC44-60 | NC44 | 9140/9450 | 165 | 9600 | 1613 | 1125/1163 |
| 71.4 (2-13/16) | NC44-60 | 9140/9450 | 9600 | 1022/1056 |
| 6-1/4 | 158.8 | 57.2 (2-1/4) | NC44-62 | NC44 | 9140/9450 | 170 | 9600 | 1712 | 1237/1279 |
| 71.4(2-13/16) | NC46-62 | 9140/9450 | 9600 | 1134/1172 |
| 6-1/2 | 165.1 | 57.2(2-1/4) | NC46-65 | NC46 | 9140/9450 | 172 | 9600 | 1752 | 1352/1398 |
| 71.4(2-13/16) | NC46-65 | NC50 | 9140/9450 | 9600 | 1249/1291 |
| 6-3/4 | 171.4 | 57.2(2-1/4) | NC46-67 | NC46 | 9140/9450 | 180 | 9600 | 1919 | 1471/1521 |
| 7 | 177.8 | 57.2 (2-1/4) | NC50-70 | NC50 | 9140/9450 | 190 | 9600 | 2138 | 1597/1651 |
| 71.4(2-13/16) | NC50-70 | 9140/9450 | 9600 | 1494/1545 |
| 7-1/4 | 184.2 | 71.4(2-13/16) | NC50-72 | NC50 | 9140/9450 | 200 | 9600 | 2369 | 1625/1680 |
| 7-3/4 | 196.8 | 71.4(2-13/16) | NC56-77 | NC56 | 9140/9450 | 210 | 9600 | 2612 | 1895/ 1960 |
| 8 | 203.2 | 71.4(2-13/16) | NC56-80 | NC56/ 6-5/8REG | 9140/9450 | 210 | 9600 | 2612 | 2040/2109 |
| 8-1/4 | 209.6 | 71.4(2-13/16) | 6-5/8REG | 6-5/8REG | 9140/9450 | 220 | 9600 | 2867 | 2188/2263 |
| 9 | 228.6 | 71.4(2-13/16) | NC61-90 | NC61 | 9140/9450 | 240 | 9600 | 3412 | 2658/2748 |
| 9-1/2 | 241.3 | 76.2(2-13/16) | 7-5/8REG | 7-5/8REG | 9140/9450 | 250 | 9600 | 3702 | 2954/3054 |
| 9-3/4 | 247.6 | 76.2 (3) | NC70-97 | NC70 | 9140/9450 | 255 | 9600 | 3852 | 3127/3234 |
| 10 | 254.0 | 76.2 (3) | NC70-100 | NC70 | 9140/9450 | 270 | 9600 | 4318 | 3308/3421 |
| 11 | 279.4 | 76.2 (3) | 8-5/8REG | 8-5/8REG | 9140/9450 | 290 | 9600 | 4982 | 4072/4210 |
| Mechanical properties: |
| <7-inch drill collar: yield strength≥758MPa, tensile
strength≥965MPa,Four times elongation≥ 13%, Impact energy≥54J,
(Single impact energy≥47J, average value≥54J), Hardness range
285HB~341HB; |
| ≥7-inch drill collar: yield strength≥689MPa,tensile
strength≥931MPa, Four times elongation≥ 13%,Impact energy≥54J,
(Single impact energy≥47J, average value≥54J), Hardness range
285HB~341HB. |
| Drill collar can be customized as per customer's design. |
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Material and process:
- Forging process: integral die forging to eliminate internal defects and ensure
structural uniformity.
- Heat treatment: quenching and tempering treatment improves hardness and toughness
and extends service life.
- Inspection standard: 100% ultrasonic flaw detection (UT) + magnetic particle inspection
(MPI), in line with API SPEC 7-1 specification.
- Various types: Drill collars are divided into various types, including integral
drill collars, spiral drill collars and non-magnetic drill collars.
- High strength and rigidity: The wall thickness of the drill collar is large, generally
38~53mm, which is equivalent to 4~6 times the wall thickness of the
drill pipe.
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Application areas:
The drill collars produced and sold by our company Huichi petro are
widely used in various land and offshore platform oil field
geological exploration, development drilling and land
high-difficulty exploration project operations. They are suitable
for drilling shallow wells, medium-deep wells, deep wells and
horizontal wells. Drill collars play an indispensable role in
drilling construction of different types of formation conditions,
including soft formations, hard formations and complex formations.
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Product advantages:
The drill collar products provided by our company Huichi petro have
significant advantages in quality and performance.
- Ultra-long life: Surface hardening treatment reduces wear rate and maintenance
costs by more than 30%.
- Flexible adaptation: Supports non-standard customization to meet special well depth and
geological requirements.
- Safe and reliable: Strict quality control system ensures that each drill collar meets
international standards and industry specifications and has stable
and reliable performance.
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After-sales service:
Our company Huichi petro has a professional technical team that can
provide personalized solutions and high-quality after-sales service
and drilling solution optimization free of charge according to the
specific needs of customers. , Provide all-round support and
guarantee for your drilling operations. Choosing our drill collar
products means choosing efficient, safe and reliable drilling
operation guarantee. Global logistics support, 48-hour emergency
response. Free replacement of damage caused by material defects
during the warranty period.
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Contact us:
Get the drill collar selection manual and quotation now to inject
reliable power into your drilling project!
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Product display:
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Product package:
Product packaging: iron box or iron frame, wooden pallet, wooden
box, bulk or customized according to customer requirements.
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Product detection:
100% inspection will be carried out before shipment, and video
image data and inspection reports will be provided.
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Accepted delivery terms:
FOB, CFR, CIF, EXW, FAS, CIP, FCA, CPT, DEQ, DDP, DDU, Express
Delivery, DAF, DES.
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About HuiChi (HC) petro:
Shandong Huichi Industry & Trade is a professional supplier of
drilling equipment for the oil and gas industry. We are committed
to providing the best products and services to customers around the
world.
We HuiChi (HC) Petro always regard our customers as our partners
and aim to achieve long-term cooperation value. Our Huichi products
cover different fields such as oil fields, water wells, HDD, etc.
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Why choose HuiChi (HC) petro?
One-stop drilling equipment supply;
Employee engineers have more than 10 years of experience in
supplying drilling equipment;
More than 10 people engaged in export business;
More than 40 partner countries and regions;
More than 200 customers having close cooperative relationships;
More than 250+ partner factories as suppliers.
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Focus on well drilling equipment , we have been working hard and
hope to become your most professional oil & gas equipment supplier
and the best partner!
Sales Manager: Cherry Chi
Email: cherry@huichipetro.com
Mob/WhatsApp/We chat: +86 15553820372
