Quality Inspection Items And Key Points of Drill Pipes

As an indispensable key component in drilling operations, the performance and safety of drill pipe is directly related to the smooth progress of drilling work and the safety of operators. In the fields of oil, natural gas, geological exploration and hydrological drilling, the quality inspection of drill pipes is particularly important.

Importance of inspection

As a typical representative of OCTG pipe, drill pipes are subjected to huge pressure, torque and vibration during drilling, and are also faced with problems such as wear, corrosion and fatigue. Failure of drill pipes may lead to interruption of drilling operations and even cause serious safety accidents.

Therefore, regular inspection of drill pipes can timely discover potential problems, prevent accidents, and ensure the continuity and safety of operations.

Common problems with drill pipes

1. Wear: During the use of drill pipes, both the inner and outer surfaces may be worn due to friction.

2. Corrosion: Under certain circumstances, drill pipes may be subject to chemical or electrochemical corrosion.

3. Fatigue: Fatigue cracks may occur in drill pipes under long-term cyclic loads.

4. Plastic deformation: Under high pressure, drill pipes may undergo plastic deformation.

5. Thread damage: The thread is the key part of the drill pipe connection and is susceptible to damage.

Drill pipe inspection items

1. Appearance inspection: Check whether there are cracks, corrosion, wear and tear on the surface of the drill pipe.

2. Dimension inspection: Measure the diameter, length, thread accuracy and other parameters of the drill pipe to ensure compliance with the standards.

3. Mechanical property inspection: Including tests such as tensile strength, yield strength, impact toughness, torsion test, etc.

4. Non-destructive testing: Use ultrasonic, magnetic powder, penetration and other methods to detect whether there are defects inside the drill pipe.

Key points of inspection analysis

1. Appearance inspection

Use high-brightness light source and appropriate magnification equipment to carefully check whether there are scratches, indentations, corrosion pits and other defects on the surface of the drill pipe. Pay special attention to whether there is deformation, wear or cracks at the drill pipe joint. Check whether the coating is complete and uniform, and whether there is any shedding or blistering.

2. Dimension inspection

Use precision measuring tools such as calipers, micrometers and thread gauges to accurately measure the diameter, length and thread parameters of the drill pipe. Pay attention to the diameter changes in different parts to ensure the accuracy of the measurement results.

3. Mechanical property testing

Tensile test is used to understand the tensile strength, yield strength and torsion performance of the drill pipe, and impact test is used to evaluate the impact toughness of the drill pipe. Bending test can detect the bending resistance of the drill pipe.

4. Nondestructive testing

Ultrasonic testing: Select appropriate probes and coupling agents, pay attention to the moving speed and angle of the probe, and ensure that the test covers the entire drill pipe.

Magnetic particle testing: Select appropriate magnetic powder and application method to ensure that the magnetic powder can evenly cover the surface of the drill pipe and improve the detection sensitivity.

Penetrant testing: Control the penetration time of the penetrant to ensure the cleaning effect, and use appropriate light sources to check the development effect of the penetrant.

Testing precautions

1. Preparation before testing: Ensure that the surface of the drill pipe is clean and free of oil, dust and other debris to avoid affecting the accuracy of the test.

2. Operating specifications: The test personnel must strictly follow the test operating procedures to avoid misjudgment or missed detection due to improper operation.

3. Data recording: During the test process, various test data should be recorded in a timely and accurate manner, including measurement values, defect locations and other information.

4. Multiple measurements: For key parameters, multiple measurements should be taken and the average value should be taken to improve the reliability of the test results.

5. Environmental monitoring: Pay attention to the temperature, humidity and other conditions of the test environment to ensure that they meet the test requirements and avoid environmental factors affecting the test results.

6. Test sequence: Perform tests in a reasonable test sequence to avoid missed tests or repeated tests.

7. Abnormal situation handling: If an abnormal situation is found, the test should be stopped in time, the cause should be analyzed, and corresponding measures should be taken to deal with it.

8. Comparative analysis: Compare and analyze the test results with the standard value or historical data to find potential problems in time.

Summary

Drill pipe detection is an important part of the drilling industry. It is not only related to the efficiency and cost of the operation, but also to the safety of the operators and the normal operation of the drilling equipment. With the development of technology, drill pipe detection methods are also constantly improving. More automated and intelligent detection equipment will further improve the accuracy and efficiency of detection. Therefore, drilling companies should attach importance to drill pipe detection, select appropriate detection methods and standards, ensure the reliability and safety of drill pipes, and thus ensure the smooth progress of the entire drilling operation.