Annular speed-increasing cyclone for vertical well

Abstract

The invention discloses an annular speed-increasing cyclone for a vertical well. The annular speed-increasing cyclone comprises an inner barrel, a rubber impeller and an outer barrel, wherein the inner barrel is formed by splicing two half barrels which are detachably connected; a rubber barrel groove is formed in the middle of the inner barrel; external thread parts are arranged at the upper end and the lower end of the inner barrel; the external thread parts at the two ends are in threaded connection with locking nuts; a group of tong tooth grooves are formed in the inner wall of the inner barrel; matched tong teeth are placed in the tong tooth grooves; the rubber impeller comprises a rubber barrel and a group of blades which are radially connected to the periphery of the rubber barrel; the rubber barrel is sleeved in the rubber barrel groove; the outer barrel is sleeved on the outer side of the inner barrel; the outer barrel and the inner barrel are fixed through the locking nuts; the outer barrel is provided with a group of blade grooves for the blades to extend out; and movable gaps are reserved between the blade grooves and the blades. According to the annular speed-increasing cyclone, transverse shear stress is applied to drilling fluid at an underground annular position by utilizing the rotation of the rubber impeller, and the flow velocity of the drilling fluid is increased, so that an effect of clearing rock debris falling blocks accumulated and retained in a borehole is achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum equipment, in particular to an annular speed-increasing cyclone for vertical wells. Background technique [0002] In the process of oil drilling construction, the well wall is often unstable and collapsed due to various reasons, thereby forming an irregular well diameter. "Candied haws" or "big belly" wells. [0003] In this type of irregular well diameter section, due to the significant decrease in the return velocity of the annular space and the change of the flow trajectory of the drilling fluid fluid area, the ability of the drilling fluid to carry cuttings or rock fragments is also greatly reduced, and some cuttings or rocks The falling blocks perform repeated rising and falling movements in the "big belly" well section, and gradually accumulate and remain away from the drilling tool and the high flow rate area. When the circulation is stopped, the debris or debris accumulated in the "big...

AI Technical Summary

Problems solved by technology

When the circulation is stopped, the debris or debris accumulated in the "big belly" well section will start to slide down the wellbore due to gravity. If it slides down to a relatively regular well section and remains or accumulates, it will cause tripping resistance. If it is not handled properly, it may even easily cause a stuck pipe accident; in addition, if the cuttings or pieces fall to the bottom of the well, it will form sand, which will make it impossible to drill to the bottom smoothly, and it needs to be cleared by reaming cycle to prolong the construction period; If cuttings or falling blocks cannot be removed, when they slide down and are carried up by the drilling fluid again to the well section with regular diameter, it is easy to cause poor pump, poor top drive and resistance and stuck phenomenon again.

[0004] Therefore, when there is an irregular well diameter and the formation of "candied haws" or "big belly" wellbore, the drilling fluid will become less effective in carrying cuttings or falling blocks in this well section, which will not only reduce the drilling timeliness, but also prolong the construction period and increase the drilling cost , and bring great hidden dangers to construction safety

[0005] At present, in order to remove accumulated cuttings or falling blocks in this type of well section, the method of adjusting the rheology of the drilling fluid is often used on site, that is, the method of thick slurry or heavy thick slurry. This method mainly increases the viscosity and shear rate of the drilling fluid. However, it is difficult for the cuttings or falling blocks in the edge area far away from the drill tool in the "big belly" due to the flow velocity and flow trajectory. It is started by fluid flushing and then taken away from the area, so the removal efficiency is very low and the effect is poor. It often requires multiple cycles of thick / heavy slurry and multiple short trips for treatment, which increases the cost of drilling fluid and also Extended drilling cycle

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