Hydraulic variable-diameter stabilizer and method for changing more than three diameters

Abstract

The invention discloses a hydraulic diameter-variable stabilizer capable of changing more than three diameters and a diameter-variable method. The hydraulic diameter-variable stabilizer capable of changing more than three diameters comprises a body 1; an upper mandrel 2 is installed in a hole in the upper end of the body; the upper mandrel is connected with a lower mandrel 9; the upper mandrel is externally provided with a reset spring 4; the body is provided with a group of spiral wings 20; each spiral wing is provided with a group of circular holes; each circular hole is internally provided with a righting block 8; the bottom of the righting block is slidably connected with a group of beveloid 7 sleeved on the upper mandrel; a rotary sleeve 12 and a slide sleeve 13 are sleeved on the lower mandrel; an outer slide sleeve 14 is sleeved outside a slide sleeve of the rotary sleeve; and a position variable spring 15 is installed between the outer slide sleeve and the slide sleeve. The hydraulic diameter-variable stabilizer is capable of changing the righting dimension of the stabilizer through the open and close of a slush pump, satisfying the requirement of the drilling well track change, improving the control precision of the well track, improving the working efficiency of the directional well and horizontal well, reducing the frequency of lifting the drilling tools, and reducing the drilling locking accident generated by the change of the well diameter. The depth of a key channel is changed, so more variable diameters can be processed.

Description

technical field [0001] The invention relates to a hydraulic variable-diameter stabilizer and a diameter-variable method capable of changing more than three diameters, and belongs to the technical field of petroleum drilling tools. Background technique [0002] At present, there are mainly four ways to change the diameter of the oil drilling variable diameter stabilizer in the downhole working state: one is to realize the diameter change by controlling the drilling fluid displacement, the other is to realize the diameter change by putting steel balls into the drill pipe, and the third is to realize the diameter change. The diameter change is realized by controlling the drilling pressure, and the fourth is realized by electric control. The existing drilling fluid displacement control method has the following deficiencies: first, the downhole diameter changer has only two working positions of retraction and expansion; second, the pins in the diameter reduction mechanism slide i...

AI Technical Summary

Problems solved by technology

The existing drilling fluid displacement control method has the following deficiencies: first, the downhole diameter changer has only two working positions of retraction and expansion; second, the pins in the diameter reduction mechanism slide in the chute and are easily worn and stuck; Third, drilling pin holes on the body to fix the pins weakens the mechanical strength of the body

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