A New Formation Core Sampling Bit to Prevent Core Fracture

Abstract

The invention discloses a novel stratum rock core sampling drill preventing a rock core from fracturing. The novel stratum rock core sampling drill comprises a drill crown and a stainless steel drill rod, wherein the drill crown is saw-toothed and covered with diamond particles; four sharp scrapers are installed inside the drill rod; and a scraper controller is installed at the tail of the drill rod. The novel stratum rock core sampling drill is characterized in that the length of the scrapers is equal to the length of the drill rod; the scraper controller can control the scrapers to open and close; when the scraper controller is turned on, the scrapers and the inner wall of the drill rod are in an oblique crossing state at a certain angle; when the scraper controller is turned off, the scrapers and the inner wall of the drill rod are tightly attached at a zero angle; the four scrapers are uniformly distributed on the inner wall of the drill rod; and tips of the four scrapers form a circle with the diameter of 25 mm. The novel stratum rock core sampling drill has the benefits as follows: after rock core drilling is finished, the scraper controller is turned off, so that the scrapers and the inner wall of the drill rod are tightly attached at a zero angle; and space is made between the drill rod and a rock core inside the drill rod, the drill rod is pulled out, and the rock core inside the drill rod can be effectively prevented from fracturing.

Description

technical field [0001] The invention relates to a portable formation core sampling drill bit, in particular to a portable formation core sampling drill bit which prevents the core from breaking. Background technique [0002] The application of the portable formation core sampling rig has provided great help for the acquisition of rock samples in the field environment. The original imported drill bit of the drilling rig is a heavy-duty imported diamond drill bit with a stainless steel shank, and a diamond crown with a water leakage groove. The original domestic drill bit is a diamond thin-skinned drill bit, and there are two water outlet notches on the crown of the drill bit. These two drill bits are designed with a water outlet on the crown of the drill bit. During the working process of the drill, water flows in from the tail of the drill bit and flows out from the notch of the crown to cool the drill bit and reduce the wear of the drill bit. [0003] However, in actual f...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to aim at the defects of the existing drill bits, to provide a formation core sampling drill bit which prevents the core fracture, which can reduce the probability of core fracture in the drill bit while meeting the sample size requirements of the core column, and solve the problem of the drilling process. The core is easy to separate from the basement rock formation. Even if the core breaks, it can effectively avoid the occurrence of the core blocking the drill pipe.

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