Standard specification for drill pipe grading and inspection

Drill pipe is an essential tool in oil drilling. Drill pipes are divided into multiple grades according to strength and service life. Each grade of drill pipe has its corresponding technical indicators and usage requirements. In order to ensure the quality and safety of drill pipes, it is necessary to carry out classification testing on drill pipes of various grades.

Drill pipe grading standards:

1. Drill pipe material

There are many drill pipe materials available on the market. According to the strength and service life of the material, drill pipes can be divided into steel grade and non-steel grade. Among them, steel grade drill pipes are divided into four grades: G, S, E and X according to different grades. Non-steel grade drill pipes are divided into five grades: A, B, C, D and E.

2. Technical indicators
(1) Drill pipe outer diameter
The outer diameter is one of the important indicators of drill pipe strength and service life. Different grades of drill pipe outer diameters have different regulations.

(2) Drill pipe wall thickness
The wall thickness of the drill pipe also has a great impact on the strength and service life of the drill pipe. Different standards must also be specified according to different grades.

(3) Tensile strength and yield strength
The tensile strength and yield strength of drill pipe are the main indicators of drill pipe grade, and different grades of drill pipe have their corresponding requirements. In the classification inspection, it is necessary to check whether the tensile strength and yield strength of the drill pipe meet the specified standards.

3. Grading testing methods and standards
The grading inspection of drill pipes should comply with standards such as "Basic Technical Conditions for Drilling Equipment in the Oil and Gas Industry" and "Technical Regulations for Drill Rod Grading". Its basic contents include the following aspects:
(1) Testing personnel should receive professional training and hold relevant certificates.
(2) Basic inspections such as appearance inspection, dimensional inspection, and physical weight inspection are required for each drill pipe.
(3) Steel grade drill pipes should be tested for tensile strength, yield strength and impact toughness; non-steel grade drill pipes should be tested for yield strength and impact toughness.
(4) Based on the test results, grade and identify the drill pipe.

Drill pipe operating specifications:

When producing and using drill pipe, we must strictly follow the standards and procedures, and pay special attention to the following aspects:
(1) When purchasing drill pipe, choose products from regular manufacturers and avoid purchasing inferior or fake products.
(2) During the transportation, storage, and use of drill pipes, care should be taken to avoid excessive bending and collision of the drill pipes to prevent damage to the drill pipes.
(3) Testing personnel should hold relevant certificates to ensure their testing capabilities and professionalism.
(4) In grading testing, testing should be carried out in strict accordance with standards and procedures, and results and grading should not be modified at will.
(5) When using drill pipe, operate it according to standard requirements to avoid excessive stretching or twisting that may cause the drill pipe to break.

Summarize:

This article introduces the standard specifications for drill pipe grading testing, including different grades of drill pipe materials and technical indicators, as well as grading testing methods and standards. Enterprises must follow relevant standard procedures during production and use to ensure the quality and safety of drill pipes.

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