Calculation of The Internal Capacity of Drill Pipes

Drill pipes are an indispensable tool in oil drilling. They are responsible for transmitting torque and pressure from the drill bit. They are often used in the structure of oil and gas wells together with octg pipes and casing pipes to jointly ensure the safety and efficiency of drilling projects. Drill pipes play a vital role in the drilling process. Correctly selecting the size of drill pipes can effectively improve drilling efficiency.

What is the internal capacity of drill pipes

The internal capacity of drill pipes refers to the capacity of liquid or mud that can be stored inside the drill pipe. It is one of the important parameters in drilling projects. When drilling, liquid or mud needs to be transported through the drill pipe. By calculating the internal capacity of the drill pipe, the storage capacity of liquid or mud during the drilling operation can be clearly known.

How to calculate the internal capacity of drill pipes

The calculation of the internal capacity of drill pipes requires the inner diameter, outer diameter and length of the drill pipe.

The calculation formula of the drill pipe internal capacity is: V=π×[(D1²-D2²)/4]×L

Wherein, V represents the internal capacity of the drill pipe, π is the circumference, D1 is the outer diameter of the drill pipe, D2 is the inner diameter of the drill pipe, and L is the length of the drill pipe. By using this formula, the value of the drill pipe internal capacity can be quickly calculated.

Calculation method of the internal capacity of drill pipes of different sizes

To calculate the internal capacity of the drill pipe, factors such as the length, diameter, and thread size of the drill pipe need to be considered. The calculation method of the internal capacity of drill pipes of different sizes is as follows:

1. 2 7/8-inch drill pipe: internal capacity ≈ (drill pipe length-joint length) × 0.0001819

2. 3 1/2-inch drill pipe: internal capacity ≈ (drill pipe length-joint length) × 0.0003266

3. 4 1/2-inch drill pipe: internal capacity ≈ (drill pipe length-joint length) × 0.0006162

4. 6 5/8-inch drill pipe: internal capacity ≈ (drill pipe length-joint length) × 0.001537

In the above formula, the joint length needs to be adjusted according to the specific use of the drill pipe.

The significance of the internal capacity of the drill pipe

Knowing the internal capacity of the drill pipe can help engineers reasonably control the storage capacity of liquid or mud during drilling, so as to ensure the continuity and stability of drilling operations.

If the liquid or mud storage inside the drill pipe is insufficient, it may cause problems such as faults or stuck drill during drilling. Therefore, as an important parameter, the internal capacity of the drill pipe needs to be taken seriously by drilling engineers and calculated accurately.

How to improve the accuracy of the internal capacity of the drill pipe

1. Strengthen the accuracy of on-site measurements, especially the accuracy of the measurement of the inner diameter of the drill pipe.

2. Consider the impact of the joints and wear between the drill pipes on the internal capacity.

3. Use high-precision measuring instruments reasonably.

Other precautions for drill pipes

1. The installation and use of the drill pipe should comply with relevant requirements, and necessary inspections and repairs should be carried out.

2. When using the drill pipe, it is necessary to strictly control the load it bears to prevent breakage or other safety accidents.

3. The size of the drill pipe should be selected according to the specific drilling operation requirements, and the drill pipe should not be too small or too large. Common materials include high-strength carbon steel pipes and alloy materials with excellent corrosion resistance.

4. The material of the drill pipe should have a certain tensile strength and toughness to meet the process requirements of oil drilling.

5. Some special connection points may also be equipped with pup joints to better achieve equipment docking.

Summary

In summary, correctly selecting drill pipes of different sizes and calculating their internal capacity are crucial to the smooth progress of the oil drilling process. During the drilling process, attention should be paid to controlling the load of the drill pipe, and necessary inspections and adjustments should be made to the installation, use and maintenance of the drill pipe.

Read more: Size of Drill Pipe or How Many Types of Drill Pipe Threads Are There?