A controllable variable diameter drill bit
A drill bit and drill body technology, which is applied in the field of controllable variable diameter drill bits, can solve the problems of stick-slip of drill pipe, stuck drill bit in stable operation, small drill bit in cementing annulus, etc. The effect of improving rock breaking efficiency
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Embodiment 1
[0041] When the drill bit is worn out with the rock formation during the drilling process, the drill bit becomes smaller and smaller, resulting in a smaller diameter of the drilled hole, which makes it difficult to run in the hole, resulting in the need for a short trip in the middle of the hole, and correcting the hole to prevent jamming. ;The flow of drilling fluid into the pressurized sliding sleeve (2) can be appropriately increased to drive the pressurized sliding sleeve (2) to push the locking sliding sleeve (4), thrust bearing (5) and connector (7) to move downward and compress When the spring (9) and the connector (7) move downward, they will push the connecting rod (8) to drive the combination blade to expand slightly outward, so as to complete the small diameter change of the drill bit to compensate for the radial change caused by the wear of the drill bit. The size is reduced to correct the hole diameter, thereby avoiding the problem of bit sticking caused by the red...
Embodiment 2
[0043] During the drilling construction process, limited by factors such as well depth, formation pressure and casing layer number and diameter, the diameter of the wellbore drilled by a conventional drilling bit with a fixed diameter cannot meet the annular gap required for casing cementing. It can increase the flow of drilling fluid into the pressurized sliding sleeve (2), and drive the pressurized sliding sleeve (2) to push the locking sliding sleeve (4), thrust bearing (5) and connector (7) to move down the compression spring ( 9), when the connector (7) moves downward, it will push the connecting rod (8) to drive the combined blade to expand outward, so as to implement the diameter reduction of the drill bit. When the pressurized sliding sleeve (2) pushes the locking sliding sleeve ( 4) After sliding out of the guide groove, because the locking slideway (403) on the upper end of the self-locking column (401) only touches half of the inclined surface of the V-shaped locking...
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