The waterless scraper coring bit is a drill bit used for coring drilling in soft to medium-hard formations. Its structure mainly consists of drill bit body, scraper blade, carbide column, gauge area, etc. The scraper blade is usually embedded in the drill bit body, and the carbide column is located between the scraper blade and the gauge area to support and fix the scraper blade. The diameter protection area is used to protect the outer diameter of the drill bit body and prevent excessive wear of the drill bit.
The characteristic of the water-eye-less scraper coring drill bit is that there are no water holes, so the scraped core cannot be removed from the hole by flushing fluid. Instead, the core is stored in the inner cavity and cannot be removed until the drill bit is worn. This drill bit is suitable for soft to medium-hard drillability formations, such as limestone, marl, etc.
It should be noted that the waterless scraper coring drill bit needs to be operated with caution to avoid core clogging due to improper operation, thereby affecting the core quality. At the same time, since the core cannot be removed by flushing fluid, other methods need to be used to remove the core from the drill bit cavity.
To sum up, the waterless scraper coring bit is a drill bit suitable for coring drilling in soft to medium-hard formations. The structure is relatively simple, but the operation needs to be careful to ensure the quality of coring.
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