Basic Understanding about Drill Pipe

Drillpipe is seamless steel pipe made up in the drill string and it is the major component of the entire drillstring. Typically, 90% – 95% of the total length is drill pipe. Thread connection of drill pipe is called “Tool Joint”. One end of drill pipe has a female end which is named as “Box” (see Figure 1).


Figure 1 – Box End of Tool Joint

Another end of drill pipe is a male end known as “Pin” (see Figure 2).


Figure 2 – Pin End of Tool Joint

Component of Tool Joints – Pin (Figure 3)


 Figure 3 – Pin End Component

Component of Tool Joints – Box (Figure 4)


Figure 4 – Box End Component

Figure 5 shows when the drill pipes are made up together.


Figure 5 – Drillpipe Make Up

 Each joint of drill pipe is sometimes called “Single” and the length of each single is classified based on three API length range in the table below (see Table 1).


Table 1 – API Range of DrillPipe

The most common drill pipe length is commonly in “Range 2 (R2)”. Each joint of drill pipe does not have the same length therefore all drill pipes must be measured to get an exact length. Drilling depth is measured by length of drill string (drill pipe, drill collar, BHA) hence the right measurement is the key of the right depth.

The drill pipes are manufactured in various sizes, material, etc. In order to standard pipe grade, API classifies drill pipe into several classes based on the table below (Table 2).

Tensile requirements - common oilfield


 Table 2 – API Drill Pipe Grade US customary unit (Ref: API Specification 5DP Specification for Drill Pipe EFFECTIVE DATE: AUGUST 1, 2010 Page 87)

In the industry, there are several drill pipes manufactured from several companies. Therefore, in order to get the detailed specification of particular pipe, it is recommended that you need to find data from the manufacture spec sheet.


Figure 6 – 4.000″ WEAR KNOT 14.00ppf 0.330″ wall IU

 We wish you would enjoy learning from our article. Please feel free to leave us some comments.


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15 Responses to Basic Understanding about Drill Pipe

  1. Masoud says:

    I think it would be better if you added something about classification of drill pipes based on their quality after using. I mean those adjectives that we use like “brand new” , “premium” and etc and also corresponding color which oilfield people assign to DPs.

  2. You should say something about inspection leading to classification, the use of ultrasonics, pipe derating procedures, why no ERW drill pipe, etc.

  3. Teguh says:

    Alway enjoy your post, thaks!

  4. Bilal Osman says:

    Great article. I was also hoping you explain a little the differences in thread types and how connections are are sealed. That would make the article more comprehensive.

  5. kelechi says:

    Thanks for this article and all others. Sincei got to know this website, I have checked it up daily. I just finished my masters in petroleum engineering and I hope to be a drilling engineer. I have found the clear way you convey information most helpful.

  6. Umar Ali Saleh says:

    This is splendid.

  7. Riyan fatoni says:

    It’s very good, to increase our knowledge about the drilling system.

  8. kaushik bora says:

    All of your informations / posts are helpful from beginners to seniors of drilling industry.

  9. hadi says:

    i want a information about thread of drilling pipe.

  10. NADIR says:

    i am looking for the BHA

  11. SAMUEL says:


  12. Asim Muhammad Khan says:

    Good data to find out soo many thing.

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