Bypass short joint capable of being activated and circulated repeatedly

Abstract

The invention relates to a bypass short joint capable of being activated and circulated repeatedly, relating to the field of petroleum natural gas well drilling, well completion and work-over treatment tools. According to the technical scheme, an outer body with a cavity consists of a body, an upper connector and a lower connector; the upper part of the body is provided with no less than two spraying nozzles in a radial direction; the body is internally provided with a slide sleeve which is in slidingly sealing match with the body; radial through holes corresponding to the spraying nozzles are arranged in the upper part of the slide sleeve; a spherical base is arranged below the through holes; a route groove is arranged in the lower part of the slide sleeve in an axial direction and is externally sleeved with a spring; the body is provided with a positioning pin; downstream limiting match is formed by the positioning pin and the route groove in the lower part of the slide sleeve; a slide sleeve downstream stopping point position is a communication position of a slide sleeve through hole and the spraying nozzle of the body; and a ball basket is arranged inside the hollow cavity below the slide sleeve. The bypass short joint disclosed by the invention can be used for treating well leakage and repeated bypass circulation in a well washing process. The bypass short joint has a simple structure and is simple and convenient to operate.

Description

technical field [0001] The invention relates to the field of special pipe tools for oil and gas drilling, well completion and workover operations, in particular to a bypass nipple that can be activated and cycled multiple times for dealing with lost circulation accidents and well cleaning operations. Background technique [0002] Lost circulation is a common complex situation in the well during oil and natural gas drilling. Most drilling processes have different degrees of lost circulation. Severe lost circulation will lead to a drop in well pressure, affect normal drilling, cause wellbore instability, and induce formation fluid to flow into the wellbore And blowout, temporary plugging method and large-diameter plugging materials need to be lowered into the drill pipe to pump the plugging slurry at the top of the leaky layer, and the drill needs to be tripped and the downhole drilling tool assembly needs to be reconfigured, which takes a long time and affects During normal p...

AI Technical Summary

Problems solved by technology

[0002] Lost circulation is a common complex situation in the well during oil and natural gas drilling. Most drilling processes have different degrees of lost circulation. Severe lost circulation will lead to a drop in well pressure, affect normal drilling, cause wellbore instability, and induce formation fluid to flow into the wellbore And blowout, temporary plugging method and large-diameter plugging materials need to be lowered into the drill pipe to pump the plugging slurry at the top of the leaky layer, and the drill needs to be tripped and the downhole drilling tool assembly needs to be reconfigured, which takes a long time and affects During the normal production time, if the treatment is not timely, oil and gas layers are prone to the complicated situation of coexistence of blowouts and leaks

In addition, in the current domestic workover operations, it has not been used to activate the bypass cycle by throwing the ball multiple times to increase the circulation displacement in the annular area of ​​the bypass sub-section to clean the sub-joint of the casing.

Images