Front-back jet polycrystalline compound mono-cone bit

Abstract

The invention belongs to the field of petroleum drilling and in particular discloses a front-back jet polycrystalline compound mono-cone bit. The front-back jet polycrystalline compound mono-cone bit comprises a cone (1) and a bit matrix (2), wherein a main shaft (15) extended obliquely inward is arranged at the end part of the bit matrix (2), the cone (1) is arranged on the main shaft (15), a water injection hole (6) as well as a forward diagonal water hole (7) and a backward diagonal water hole (5) communicated with the water injection hole (6) are formed inside the bit matrix (2), dip direction of the forward diagonal water hole (7) is the same with the dip direction of the main shaft (15), and the dip direction of the backward diagonal water hole (5) is opposite to the dip direction of the main shaft (15); and multiple rows of sprocket holes with rotation tracks equally spaced and staggered are arranged on the cone (1), and cutting teeth (22) are arranged in the sprocket holes in an interference manner. According to the scheme of the invention, the front-back jet polycrystalline compound mono-cone bit has the advantages of stable permanent tooth brazing, large cone bearing space, more comprehensive rock breaking and the like.

Description

technical field [0001] The invention relates to the field of oil drilling, in particular to a front and rear injection polycrystalline composite single-cone drill bit. Background technique [0002] In the past few years, the hybrid drill bit used in the field of rock drill bits has the combined rock breaking technology of roller cone bit teeth and PDC bit teeth, which improves the working index of the drill bit and reduces the drilling cost. It is the latest development of the two technologies of the drill bit. [0003] Patent number: 200880016630, the name of the patent is "a hybrid drill and its drilling method"; patent number: 2012105525560, the name of the patent is "a hybrid drill with enhanced core cutting function". [0004] The above two kinds of hybrid drill bits all use cylindrical polycrystalline composite tooth column in manufacture, and there are some shortcomings in the process. One is to braze the horizontal composite tooth column to the cylindrical groove sur...

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Problems solved by technology

[0004] The above two kinds of hybrid drill bits all use cylindrical polycrystalline composite tooth column in manufacture, and there are some shortcomings in the process. One is to braze the horizontal composite tooth column to the cylindrical groove surface of the blade end face, The brazing temperature is not easy to control, and the reliability of fixing the composite teeth is poor. Second, the volume of the gear is too small to accommodate the bearing. The speed of the gear is high and the bearing life is low and easy to fail. The third is that the teeth of the gear are only in the arc part of the composite tooth. The bottom of the well participates in the combined rock breaking of composite teeth

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