Non-magnetic Directional Joint

I. Core roles

1. Isolation of magnetic interference: It is like an "extended link" in a non-magnetic area, which can isolate magnetic drilling tools such as screw motors and drill bits from the measuring probe while drilling, control the magnetic interference source at a safe distance, ensure that the magnetic field environment of the probe meets the measurement requirements, and avoid deviations in key data such as azimuth angle.

2. Connect drilling tools and transmit power: Connect different specifications of non-magnetic drill rods, non-magnetic drill collars, or bottom motors through high-precision threads at both ends, while transmitting the torque, tension, and pressure required for drilling, ensuring the overall operation of the drilling tool assembly.

3. Ensure the circulation of drilling fluid: The internal flow channel is designed with hydraulic optimization to allow the drilling fluid to pass smoothly, reduce eddy currents and pressure fluctuations, which not only ensures the efficiency of the bottom motor, but also reduces the damage of hydraulic impact to the exploration pipe.

II. Materials and key characteristics

1. Common materials: High performance non-magnetic steels such as P550 and P650 are commonly used, and some scenarios may use high-grade non-magnetic stainless steel with stronger corrosion resistance. These materials can ensure non-magnetic performance while also meeting the requirements of high strength and corrosion resistance; Worn and failed joints can also be accessed through LoWare ®- NMBU metal powder core wire material welding repair, the magnetic permeability can still be controlled below 1.01 after repair, meeting the requirements for use.

2. Core features:

One is low magnetic permeability, usually requiring a relative magnetic permeability of ≤ 1.01 to avoid self generated magnetic field interference;

Secondly, it has high strength and toughness, capable of withstanding underground alternating torque, vibration, and high-pressure environments, preventing faults such as twisting and cracking;

The third is strong corrosion resistance, which, when combined with surface passivation and anti-corrosion coating treatment, can resist corrosion from corrosive media such as acidic water and salt spray underground;

The fourth is high wear resistance. After precision forging and heat treatment optimization, the surface hardness can reach HRC30-35, which can adapt to high dust and high friction underground working conditions.

III. Main application scenarios

This directional joint is widely used in directional drilling operations for oil, natural gas, and coal mines. In the measurement system while drilling for directional oil drilling, it is an important channel for transmitting mud pulses or electromagnetic wave signals; In the underground wired drilling measurement system of coal mines, it can provide non-magnetic environment extension and mechanical connection for non-magnetic drill rods with cable cores, especially suitable for precise orientation scenarios such as gas extraction, to avoid blind spots in extraction due to measurement deviations.