Shaanxi Senwell Drilling Equipment Co., Ltd.

China Manufacturer with main products: Drill Pipe, Drill Collar, Stabilizer, Casing Tubing, Square Kelly, Drill Bit, Line Pipe, Fishing Tools

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Drill Collar

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Export Markets: North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe


  Drill Collar and Non-Magnetic Drill Collar  

Drill collars are made with material AISI 4145H in accordance with API Spec 7-1. We supply slick drill collars,  spiral drill collars and short / pony drill collar; their sizes are 30 feet  and 31 feet.
Steel grade:
AISI 4145 H modified alloy steel, full length heat treated, with chemical analysis and mechanical properties which conform to the requirements of API Spec 7 (latest edition)

- finished drill collars
- slick or spiral
- with or without slip + elevator recess
- bored drill collar bars, plain end

Drill collars are made of self-designed premium alloy steel bar and pipe materials, and heat treated by continuous gas furnace to meet the mechanical requirements in API Specs.  

Drill Collars
Slick collars
Spriral collars
Flex collars  
2, Elevator, Slip Recess or Slip Holes
Unless otherwise specified, those are machined according to API RP7G recommendation.
3, Stress Relief Groove
4, Cold Rolling of Thread Roots
5, Make In & Break Out
6, Hardbanding 
7, Thread Surface Process
All threads will be treated with phosphate coating process to improve wearness and prevent galling.

Service Process

Service Guarantee

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    ECVV doesn't charge any service fee to Buyers for buying this product.

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  • Product Quality Commitment

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  • Deposit Service Commitments

    In order to improve the quality of service, ECVV will charge for a 100CNY deposit for the agent purchasing order, and the deposit will be part of subsequent purchasing costs.

    After paying a deposit, if the purchasing order is not completed because of unsatisfied ECVV services, ECVV will refund your deposit.

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