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The difference between drill collars and drill rods

The difference between drill collars and drill rods

The drill collar is attached to the drill pipe and plays a role in overall weighting to prevent deviation. The inner diameter of the drill collar is smaller than that of the drill pipe and the weight is larger than that of the drill pipe. During the drilling process, the drilling pressure is formed by the weight of the drill string (connected by the drill pipe), so the lower part of the drill string is subjected to compressive stress.

2023/12/19

Working principle of non-magnetic drill collars

Working principle of non-magnetic drill collars

The interference magnetic field lines above and below the non-magnetic drill collar have no effect on the measuring instrument, so the non-magnetic drill collar creates a non-magnetic environment for the magnetic measuring instrument, ensuring that the data measured by the magnetic measuring instrument is true geomagnetic field information.

2023/12/15

Precautions for using non-magnetic drill collars

Precautions for using non-magnetic drill collars

1. After use, mud and dirt should be removed, the safety of each component should be checked, then anti rust oil should be applied and stored in a dry and ventilated place. 2. On site inspection, if one of the criteria for repair or scrapping is found, it should be recycled for repair or scrapping. 3. In order to ensure the accuracy of magnetic instrument measurement results, it is necessary to choose the length of the non-magnetic drill collar reasonably.

2023/12/13

The function of spiral drill collars

The function of spiral drill collars

Spiral drill collars are used to machine three right-handed spiral grooves on the outer cylindrical surface of circular drill collars. Leave a 305~560mm section at the external threaded end joint and a 457~610mm circular drill collar section without machining spiral grooves at the internal threaded end joint for ease of connection and repair. The weight is 4% less than that of circular drill collars of the same size.

2023/12/11

Non magnetic drill collar action

Non magnetic drill collar action

Non magnetic drill collars are made of a low-carbon, high chromium manganese alloy steel. They are refined through strict chemical composition ratios and forged to achieve their mechanical properties. They have good low magnetic permeability, high strength mechanical properties, excellent intergranular corrosion cracking resistance, and excellent wear resistance. When the magnetic field strength is 1 × 105/4 Π At A/m, the relative magnetic permeability of the non-magnetic drill collar µ r ≤ 1.010.

2023/12/08

The function and shape classification of drill collars

The function and shape classification of drill collars

Drill collars are used to increase the weight of the drill string and provide greater drilling pressure to the drill bit, accelerating the drilling speed. Due to its strong rigidity and good stability, it also plays a role in stabilizing the drill bit and maintaining the wellbore trajectory.

2023/12/06

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