Retraction type long stroke hydraulic power pressurizer

Abstract

The invention relates to a retraction type long stroke hydraulic power pressurizer. An upper barrel body, a middle barrel body and a lower barrel body are sequentially connected to form an outer shell, the upper part of the upper barrel body is vortically connected with a drill collar, a core shaft is inserted into the outer shell, the upper end of the core shaft is positioned in the inner cavity of the upper barrel body, and is vortically connected with an upper connector, the lower part of the core shaft is provided with a core shaft circular bead which is supported under a lower end opening of the lower barrel body, and the lower end of the core shaft circular bead is connected with a downhole motor; and center ducts of the core shaft and the upper connector are communicated with a center duct of the outer shell, the core shaft and the lower barrel body are sealed, the circumferential wall of the upper part of the core shaft is provided with guiding long slots extending to the middle part of the core shaft, and the inner wall of the middle barrel body is symmetrically provided with support tables which are respectively embedded in the guiding long slots. The lower parts of the guiding long slots are respectively connected with an arc-shaped sliding chute, the arc-shaped sliding chutes are cylindrical spirals, the lower ends of the arc-shaped sliding chutes are respectively tilted to the right, and positioning short slots extending along the axis direction are respectively arranged over the lower ends of the arc-shaped sliding chutes. According to the hydraulic power pressurizer, flexible connection between the drill collar and a drill bit is realized, and the hydraulic power pressurizer has a simple structure and is operated reliably.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a retractable long-stroke hydraulic pressurizer, which belongs to the technical field of oil and gas drilling tools. Background technique [0002] In oil and gas drilling, the drill string in the well usually drives the drill bit below to rotate and break the rock. The drill string in the well is mainly composed of drill pipe and drill collar. [0003] During the drilling of directional wells and horizontal wells, the sliding drilling method is often used to change the direction of the wellbore, increase and decrease the inclination, and sometimes the sliding drilling method is also used to drill the vertical well section. In the process of sliding drilling, due to the cuttings bed, unsmooth wellbore trajectory, and poor drilling fluid performance, the friction between the drill string and the well wall is large, resulting in the reduced load of the hook suspending the drill string and the dril...

AI Technical Summary

Problems solved by technology

In addition, during the lowering process, the drill string will slide down unevenly, which will easily cause the drill bit to suddenly hit the bottom of the well, and sometimes it may damage the drill bit and the downhole power drilling tool, causing the sealing line of the screw pump to be washed away and stop rotating, resulting in no ROP Wait, this phenomenon is called the backpressure problem of sliding drilling

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