Reinforced pulse polycrystalline diamond compact bit for well drilling

Abstract

The invention relates to a reinforced pulse polycrystalline diamond compact bit for well drilling. The reinforced pulse polycrystalline diamond compact bit is that a water channel is formed in an inner cavity of a drill bit body along an axis; a division area is formed in the lower part of the water channel; organ-pipe shaped self-oscillating cavitation nozzles are uniformly mounted at the lower part of the division area; an organ pipe structure is arranged above the division area; a stepped cylindrical hole shaped nozzle water feeding cavity, a nozzle resonant cavity and a nozzle water outlet are arranged on the organ pipe structure from top to bottom in a sequence; the aperture of the nozzle water inlet cavity is more than the aperture of the water channel and the aperture of the nozzle resonant cavity; the aperture of the nozzle resonant cavity is more than the aperture of the nozzle water outlet; a water inlet in the upper end of the nozzle water feeding cavity is communicated with the water channel; the nozzle water outlet is communicated with the center of the division area; a pulse resonant cavity water feeding hole, a pulse resonant cavity disturbance area, a pulse resonant cavity impact area and a pulse resonant cavity separating are formed in the organ pipe type self-oscillating cavitation nozzles from top and bottom in a sequence along the axes; a pulse resonant cavity water outlet is formed in the lower end of the pulse resonant cavity separating area. The drill bit can improve the well bottom cleaning effect and the hydraulic rock breaking capacity.

Description

technical field [0001] The invention relates to a drill bit for drilling, in particular to an enhanced pulse polycrystalline diamond composite sheet drill bit for drilling, and belongs to the technical field of petroleum drilling equipment. Background technique [0002] The drill bit is the main tool for drilling and breaking rocks. Since its appearance, it has developed into different types and series for different strata and lithology. Usually, when selecting a drill bit, the engineering and geological conditions are considered, and economic benefits are taken into consideration, mainly from the following two aspects: (1) the same drill bit can obtain more footage; (2) the same time can obtain Faster ROP. The amount of footage obtained by the same drill bit is mainly related to geological conditions, drilling materials and engineering technical parameters; under certain conditions of geological conditions, drilling materials and engineering parameters, a higher ROP can be...

AI Technical Summary

Problems solved by technology

[0006] 1. Conventional polycrystalline diamond compact drill bit is combined with ordinary nozzle. After the drilling fluid passes through the water hole in the drill tool and the inner cavity of the drill bit, when the drilling fluid flows out of the nozzle, since the fluid has not been disturbed, a continuous jet is produced at the bottom of the well. This continuous jet Although it is helpful to hydraulic rock breaking and cleaning the bottom of the well to a certain extent, the degree of tumbling and migration of cuttings is limited, which is easy to cause repeated cutting; the continuous jet also generates a relative positive pressure field at the bottom of the well, which is harmful to the bottom of the well. The rock has a certain pressing effect, which limits the increase of ROP

[0007] 2. When the pulsed cavitation jet tool is used to cooperate with the drill bit, the length of the tool itself plus the height of the drill bit usually causes cavitation to occur about 0.5m away from the nozzle. The effective spray distance of any cavitation jet is certain. If the effective spray distance If it is less than the distance between the cavitation occurrence location and the water hole of the drill bit, the pulse jet generated at the nozzle will be weakened, and the effect of hydraulic rock breaking and bottom hole cleaning will also be weakened, and the degree of increasing the ROP will be limited

[0008] 3. Since the design of the organ tube type self-vibrating cavitation nozzle is limited by the size of the water hole of the drill bit and its own strength requirements, the generated pulse effect cannot be maximized. In addition, after the depth of the well, with the increase of the bottom confining pressure, It will also weaken the actual effect of the organ tube type self-vibrating cavitation nozzle, which weakens the effect of hydraulic rock breaking and cleaning the bottom of the well, and the degree of increasing the ROP is also limited

[0009] 4. One of the principles of drilling safety is to simplify drilling tools as much as possible, that is, the joints in the drilling tool assembly should be as few as possible. When using pulse cavitation jet joints, it will increase the hidden safety hazard in the well; in addition, the single-bend screw is now vigorously promoted Continuous steerable drilling technology, when it is necessary to control and adjust the well trajectory, due to the access of the pulse cavitation jet joint, it increases the difficulty of engineering control and adjustment of the well trajectory

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