Drill Collar
Drill Collar

Drill Collar


API SPEC 7-1 drill collar is made with rolling or forging AISI4145H chromium molybdenum alloy steel. Therefore, it needs to control chemical composition and the content of trace elements effectively.


1. Advantage: Competitive price and quality from our own factory

2. Certification: Approved by ISO9001, CE, SGS every year.

3. We promise that all steel sold will have a 2-year warranty period and will be responsible for every batch of goods you buy!

API SPEC 7-1 drill collar is made with rolling or forging AISI4145H chromium molybdenum alloy steel. Therefore, it needs to control chemical composition and the content of trace elements effectively.

Drill collar is a specialized tool used in the drilling of oil and gas wells. It is a heavy and thick-walled tube that is made of high-strength steel. The drill collar is attached to the drill string and is located directly above the drill bit. Its primary function is to provide weight on the drill bit, which helps to maintain a consistent rate of penetration and prevent deviation of the borehole.

One of the key advantages of drill collars is their ability to provide directional control during drilling. By adding more weight to the drill bit, the drill collar helps to keep the bit aligned with the desired direction of the borehole. This is especially important in directional drilling, where precise control of the wellbore trajectory is required.

Drill collars also play an essential role in the transmission of drilling torque from the drilling rig to the drill bit. The heavy weight of the drill collar helps to transfer the rotational force from the drill string to the drill bit, enabling efficient and effective drilling.

In addition to its primary functions, the drill collar can also be equipped with additional tools and accessories to enhance its capabilities. For example, stabilizers can be attached to the drill collar to help maintain the stability of the drill string and prevent it from deviating from the desired path.

Overall, drill collars are crucial components in the drilling of oil and gas wells. Their ability to provide weight, directional control, and torque transmission makes them essential tools for efficient and effective drilling operations. With their high-strength construction and versatility, drill collars are widely used in the oil and gas industry to achieve optimal drilling results.

Specification

Standard

Number

OD
(in.)

ID
(in.)

Length
(ft)

Weight
(lb/ft)

Typical Bending
Strength Ratio

SY5144-2007/API7-1

NC 23-31

3-1/8

1-1/4

30

22

2.57:1

NC 26-35 (2-3/8 IF)

3-1/2

1-1/2

30

27

2.42:1

NC 31-41 (2-7/8 IF)

4-1/8

2

30 or 31

34

2.43:1

NC 35-47

4-3 /4

2

30 or 31

47

2.58:1

NC 38-50 (3-1/2 IF)

5

2-1/4

30 or 31

54

2.38:1

NC 44-60

6

2-1/4

30 or 31

83










































































































Warehouse Storage

Shandong Juhuo Special Steel Co., Ltd. is a comprehensive enterpriseintegrating steel supply and processing. The company has a large inventory of metal materials such as stainless steel, galvanized, profiles, aluminum.copper, lead, etc, which can meet the needs of customers in different fields.The company has strong strength and has a professional team with excellent technology and rich experience.The company has also introduced advanced production equipment and processing technology, which can provide customers with steel products of various specifications and processing requirements.



Customer conversation

We provide the products consultation , purchase plan suggestion , logistic service ( including the shipment service , custom works ,etc ).



Application field

Taking technology as the guide, quality as the guarantee, and service as the purpose, the company actively explores the market, expands the scale of operation, and constantly improves enterprise management to ensure product quality and service quality.



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  • The company's products have passed ISO9001 certification. We can offer many types of products and our products are exported to Southeast Asia, Middle East and Africa. Products can be customized

  • according to customer requirements. To meet the requirements of different customers.

FAQ

  • A: Under normal circumstances, our online service time is 8:00-22:00 Beijing time, after 22:00, we will reply to your inquiry on the next working day.

  • A: The inner layer is packed with waterproof paper, the outer layer is packed with iron sheets, and fixed with fumigated wooden pallets. It can effectively protect the product from corrosion during the shipping process.

  • A: Sure, we can send samples all over the world, and our samples are free.

  • A: You need to provide the grade, width, thickness, coating, and tonnage you need to buy.

  • A: Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo and other ports, you can choose other ports according to your needs.

  • A: Due to the cyclical changes in raw material prices, prices vary from period to period.

  • A: We have ISO9001, SGS, EWC and other certifications.

  • A: Generally speaking, our delivery time is within 30-45 days, it may be delayed if there is a large demand or special circumstances.

  • A: Of course, we welcome customers from all over the world to visit our factory.

  • A: Of course, all of our products are strictly quality tested before packing, and unqualified products will be destroyed.