Rotary-tooth drilling bit

Abstract

The invention discloses a rotary-tooth drilling bit which comprises a connector, a basal body, blades and cutting teeth, wherein the cutting teeth are arranged on the blade surfaces of the blades, the advancing direction of the drilling bit in use is taken as the front, each blade is provided with an inner cone part, a nose part and an outer cone part in sequence from a position of each front part blade surface, which is nearly close to the center of the end surface of the front end of the basal body, to each rear part blade surface; at least one rotary tooth is arranged on the blade surface of each blade, the rotary tooth is a cutting tooth capable of rotating around the self axle wire, and the rotary tooth is mounted inside a rotary tooth hole on the blade through a rotation device. According to the rotary-tooth drilling bit, through arranging at least one rotary tooth on the blade surface of each blade, the entire circumference of the cutting end surface of the rotary tooth is enabled to participate in cutting to stratum during the stratum cutting process through the drilling bit, the use ratio of the cutting end surface of the rotary tooth is improved, the service life of the drilling bit is prolonged greatly, the depth drilling capability of a single drilling bit is enhanced remarkably, the drilling speed of the drilling bit is kept to be higher, the drilling period is shortened, and the drilling cost is reduced.

Description

technical field [0001] The invention relates to a drill bit for oil and gas drilling, in particular to a rotary tooth drill bit with rotary teeth that can automatically rotate around the central axis during drilling. Background technique [0002] In recent years, various oil fields have higher and higher requirements on the development cycle and safety of oil and gas, and the performance and service life of various matching tools have been greatly improved. The requirements for ROP and footage are getting higher and higher. For example, the PDC bit (short for polycrystalline diamond compact bit) has a unique principle of cutting the formation, which can greatly increase the drilling speed of the bit, and has become the first choice for drilling speed. [0003] In recent years, with the improvement of materials and manufacturing processes, the adaptability of PDC drill bits to formations has become wider and wider. The cutting teeth of the traditional PDC bit are fixedly br...

AI Technical Summary

Problems solved by technology

The cutting teeth embedded in the body of the blade (generally accounting for about 50% of the entire cutting teeth) do not participate in the cutting of the formation, and basically remain intact until the end of the service life of the drill bit, resulting in a short service life of the drill bit. A single drill bit If the footage is insufficient, the drilling speed of the drill bit will gradually decrease, prolonging the drilling cycle and increasing the drilling cost

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