Hydraulic type variable outer diameter cutting bed removing tool

Abstract

The invention provides a hydraulic type variable outer diameter cutting bed removing tool. The hydraulic type variable outer diameter cutting bed removing tool comprise a tube body, an upper spring, a scraper, a connecting rod, a cutter seat, a lower spring, a piston tube, a center pipe, a sliding pin, a cross rod, a side flow channel, a sliding sleeve, a shell, a planetary gear, a drive gear, a screw rod, a universal shaft and a center shaft, the sliding sleeve and the tube body are machined on the shell, the sliding sleeve and the tube body are welded through the cross rod, one end of the connecting rod is hinged to the lower end of the scraper, and the other end of the connecting rod is hinged to hinging support seats outside the cutting seat; the three hinging support seats outside the cutter seat are correspondingly mounted in three grooves in the middle of the tube body, the scraper is mounted on the slope of the groove in the middle of the tube body, the piston tube is mounted on the inner cavity on the lower part of the tube body, the screw rod, the universal shaft and the center shaft are mounted in the shell after being sequentially connected, the drive gear is mounted on the center shaft, and the drive gear, the planetary gear and a gear ring protruded on the inner wall of the sliding sleeve are sequentially engaged. According to the hydraulic type variable outer diameter cutting bed removing tool, the structure is simple, and rock removing can be effectively conducted under the work condition of rotary drilling-in or sliding drilling-in.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a hydraulic variable outer diameter debris bed removal tool. Background technique [0002] During the drilling process, the formation of the cuttings bed will cause many drilling problems: reduce the annular space, causing the pump to suffocate; increase the frictional torque during the drilling process; drill sticking or sticking due to sand sinking, which will affect drilling safety and Drilling cycle, etc. At present, the cleaning methods for the cuttings bed mainly include: ①Increase the displacement and rotation speed. The increase in displacement will cause the soft formation to collapse or fall off, increasing the risk of downhole accidents; ②Adjust the drilling fluid performance to reduce the rheological properties of the drilling fluid , to improve the ability of drilling fluid to carry rock and suspend, but its effect is limited; ③ Mechanical cleaning, use...

AI Technical Summary

Problems solved by technology

[0002] During the drilling process, the formation of the cuttings bed will cause many drilling problems: reduce the annular space, causing the pump to suffocate; increase the frictional torque during the drilling process; drill sticking or sticking due to sand sinking, which will affect drilling safety and Drilling cycle, etc.

At present, the cleaning methods for the cuttings bed mainly include: ①Increase the displacement and rotation speed. The increase in displacement will cause the soft formation to collapse or fall off, increasing the risk of downhole accidents; ②Adjust the drilling fluid performance to reduce the rheological properties of the drilling fluid , to improve the ability of drilling fluid to carry rock and suspend, but its effect is limited; ③ Mechanical cleaning, use the method of rotating the drilling tool while pulling out to stir the cuttings bed, change the flow field, or regularly set the well interval for short tripping, Removal of cuttings beds by reaming and other measures, although very beneficial to rock clearing, seriously affects the efficiency of drilling

The dynamic cuttings bed remover while drilling (ZL201210395798.5) is installed in the drilling tool assembly. When the drilling fluid passes through, or in the state of rotating drilling, or in the state of sliding drilling, It can rotate and scrape the cuttings bed, but if the size of the cutting sleeve is too large, it will not be conducive to the running and drilling of the drill string, and if it is too small, its range of action will be limited, resulting in unsatisfactory rock cleaning effect

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