PDC drill bit with anti-mud-drum nozzle structure

Abstract

The invention discloses a PDC drill bit with an anti-mud-drum nozzle structure. The drill bit comprises a cutter wing, a PDC tooth and a drill bit main body; nozzles are arranged in a chip space and the front end face of the drill bit main body closing to the outer edge, and center nozzles are further arranged in the chip space and the front end face of the drill bit main body closing to the center part; there are 1-4 center nozzles, and the aperture of the center nozzles is 5-15 mm; the center nozzles are fixing nozzles soldered or sintered in a water hole. Small nozzles are arranged in closing to the center part, and the structure can effectively brush the center part of the drill bit, reduce the technical requirement of rock debris carrying property of mud, avoid great increase of mud cost, the drilling time and high cost for the frequent trip of the drill bit mud drum, and reduce the drilling work cycle and save drilling cost.

Description

technical field [0001] The invention belongs to the technical field of drill bit design and manufacture, in particular to the design and manufacturing technology of a rotary drilling bit for petroleum and geology, and in particular to a PDC bit with an anti-balling nozzle structure. Background technique [0002] At present, rotary drilling bits including PDC teeth as cutting teeth are widely used in fields such as petroleum and geology, and such bits are called PDC bits for short. The PDC bit has the advantages of high ROP and long drilling life. PDC bits are increasingly used in the drilling process, and balling of PDC bits is a common occurrence in field applications. The mud bag of the drill bit makes the PDC composite sheet of the drill bit unable to effectively attack the formation rock, resulting in a slowdown of the drilling speed. In the case of ineffective treatment, the mud bag must be removed manually, resulting in an increase in the number of trips, reducing the...

AI Technical Summary

Problems solved by technology

Mud performance factors, poor mud performance, poor ability to carry cuttings, not easy to take away cuttings, the drill bit is prone to mud pockets at the bottom of the well, and a large amount of production costs need to be invested to improve the quality of the mud, and the economic benefits will be greatly reduced

The nozzle design cannot meet the chip removal requirements, and the poor chip removal in the flow channel prevents the cuttings from leaving the bottom of the well smoothly, and the solid phase is easily adsorbed on the drill bit

[0004] In the existing PDC bit structure, the cuttings in the core of the drill bit are difficult to be carried away by the mud, and it is difficult to solve the problem of mud balling of the bit

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