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The advantages of diamond wire-line core drilling are as follows:

High Drilling Efficiency

- Reduction of Auxiliary Time: Compared with ordinary drilling methods, wire-line coring drilling reduces the auxiliary time for tripping, increases the pure drilling time, and the economic effect is more significant as the borehole gets deeper. It can increase the drilling time by about 25% - 100%.

- Quick Retrieval of Cores: When the core is blocked, it can be retrieved immediately without having to lift the entire set of drilling tools, avoiding frequent tripping due to core blockage and thus improving the drilling efficiency.

Good Core Quality

- Improved Recovery Rate: During the drilling process, when the core is blocked, it can be retrieved in a timely manner, reducing the wear time of the core in the core barrel, which is beneficial for improving the recovery rate and quality of the core. It can ensure a relatively high core recovery rate and provide more abundant and accurate data for geological analysis.

- Ensured Integrity: The coring process is carried out inside the drill pipe, reducing the friction between the core and the wellbore and the drill pipe, and lowering the possibility of core damage, which is conducive to improving the integrity of the core.

Long Service Life of Bits and Drilling Tools

- Reduced Bit Wear: It reduces the chances of bit wear caused by reaming, screwing and unscrewing, and collision with the borehole wall, thus prolonging the bit's service life. Meanwhile, the small clearance between the drill pipe and the borehole wall makes the bit work stably and relatively reduces bit damage.

- Reduced Drill Pipe Consumption: It reduces the wear caused by screwing and unscrewing of the drill pipe threads, prolonging the service life of the drill pipe and reducing the consumption of pipe materials.

Low Labor Intensity

- Simple Operation: The core barrel is retrieved from the drill pipe by using a fishing tool with a wire rope, eliminating the need for workers to frequently screw and unscrew the drill pipe, reducing the labor intensity of workers. This advantage is especially obvious in deep hole drilling or drilling in complex formations.

High Safety

- Reduction of Borehole Accidents: It reduces the chances of flushing fluid suction and imbalance of the borehole wall pressure, thereby reducing the occurrence of borehole accidents. In addition, the drill pipe string can also serve as a casing, which is beneficial for quickly passing through complex formations and reducing the drilling risks.

Strong Adaptability

- Applicable to Multiple Formations: Diamond wire-line coring bits have high hardness and strong wear resistance, and are suitable for a variety of complex formation conditions, such as hard rock, fractured zones, and alternating hard and soft layers.

- Capable of Deviation Survey: A deviation survey instrument can be lowered inside the drill pipe by using the wire rope of the coring winch for deviation survey, which is convenient for timely understanding the inclination of the borehole and ensuring the quality of the borehole.