Pulse jet damping and depressurizing device and using method

Abstract

The invention provides a pulse jet damping and depressurizing device and a using method. The pulse jet damping and depressurizing device comprises an upper connector, an outer barrel, a pressurizing rod, a piston, a movable sealing device, an injection mechanism and a lower connector, a check valve assembly is arranged between the lower end of the upper connector and the upper portion of the outerbarrel, the lower end of the outer barrel is connected with the injection mechanism, the piston is located in the outer barrel, the compression spring is arranged between the piston and the outer barrel, and is positioned at the middle lower portion in the outer barrel; the lower end of the piston is connected with the pressurizing rod, the lower end of the pressurizing rod penetrates through theinjection mechanism and is connected with the lower connector located below the injection mechanism, and the pressurizing rod is connected with the lower portion of the injection mechanism in a sliding and sealing mode; and a jet hole is formed in the upper portion of the pressurizing rod in the radial direction. Vibration of a drill string can be absorbed, absorbed mechanical energy is convertedinto hydraulic injection, the purpose of reducing the bottom hole pressure is finally achieved, and safe and efficient well drilling is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a pulse jet shock absorbing and pressure reducing device and a using method. Background technique [0002] In deep water drilling, because seawater replaces the rock of land drilling, the pressure of the overlying strata decreases, which reduces the fracture pressure. On the other hand, because the pore pressure in deep water formations is higher than that of land drilling, the formation pressure window is narrow. , in deepwater drilling, the safe drilling fluid density window is very small and difficult to control. If the drilling fluid density is greater than the fracture, then the formation with fractures will be easily lost or fractured. If the drilling fluid density is reduced, but it is lower than the pore pressure, overflow will occur or the well wall will collapse. These complications can lead to increased drilling costs and sometimes even drilling...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of high working cost and low efficiency caused by the narrow safe density window of the existing deepwater drilling fluid, the present invention provides a pulse jet shock absorbing and pressure reducing device and its use method. The present invention can absorb the mechanical energy generated by the vibration of the drill string, and then Convert mechanical energy into hydraulic energy to provide greater pressure for jet holes, thereby generating greater negative pressure, and finally accelerate the upward return of annular drilling fluid, thereby achieving the purpose of reducing pressure

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