SU1465536A1 - Roller bit - Google Patents

Abstract

The invention relates to the rock-breaking drilling tools used in the construction of a well. The chisel includes a paw 1 with a roller cutter 2, a flushing system, a central plug 4 and a sensor for wear of the roller cutter 11. The sensor 1I is installed in the leg 1 with the ability to interact with the reverse cone of the roller cutter 2. The central plug 4 is held by a locking rod 6 connected to the piston 7. The piston 7 compresses the oil filling the cavity 9 and the channel 10 of the sensor 11. The piston cavity in the foot is stepped. The diameter of the cavity 9 exceeds the diameter of the piston 7. The sensor 11 is closed by a plug 13 or a ball valve. When the bearing is worn, the roller cutter 2 contacts the reverse cone with the plug 13 or the ball valve. This leads to depressurization of the sensor 11. The plug 4 is released and, moving, communicates the sensor cavity with the bit's flushing system. The pressure on the mud pumps is reduced. If, when the bit is detached from the bottom and then installed on the bottom, the pressure at the pumps changes; This indicates that the bit bearing is worn. I zp f-ly, 1 ill. (C O)

Description

channel 10 of wear sensor II; a fixed channel 10. If, when detached, it is fixed in leg I. The piston cavity of leg 1 is stepped, and the diameter of cavity 9 exceeds the diameter of piston 7 installed in bore 12. Hydraulic channel - 10 the cork 13 is hermetically sealed. The cavity 9 and the channel 10 are filled with oil through the valve 14. It is also possible to use a ball valve in the sensor 11 instead of the valve 13 that intersects the channel 10 and contacts the reverse cone of the roller cone 2 with the limit bearing wear. During the operation of such a device, the ball is pressed by the inverse cone of the roller cutter 2, thus opening channel 10

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When installed on the bottom of the well, the pressure at the pumps does not change, the cause of the pressure decrease is not the wear of the bit support.

Formula inventions

1, Roller bit containing paws with a flushing channel between them, mounted on the reverse cone pillars, mounted in the piston cavity of each paw, a spring-loaded piston with a stop rod, a plug in the flushing channel, which interacts with the stop rod, a wear sensor on the foot with a hydraulic a channel connected to the piston cavity and an overlapping overlapping element mounted on the outside that is interoperable with the reverse cone of the cone with allowable wear of the supports, characterized in that ensuring reliable information on support wear, the flushing channel is made with a ledge in the lower part, the piston cavity is made with a larger diameter stage, and the piston is placed with the possibility of moving it into a larger diameter piston cavity stage and communicating the hydraulic channel of the sensor and the flushing channel between the legs when unclamping and moving the cork to the ledge.

Roller bit works as follows.

When drilling, the roller cutter 2 rotates without touching the plug 13, the distance from which to the return cone of the cutter 2 is set depending on the value of the limit wear of the bit bearing. When the bearing is worn, the roller cutter 2 under the effect of the load on the bit shifts relative to the axle axis by the amount of bearing wear. At a certain amount of wear, the support of the roller cutter with its reverse cone contacts the plug 13, which leads to its destruction and depressurization of the gas gun 10. 8, squeezing out the oil moves the piston 7 and the rod 6, which has a release channel 10.

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When installed on the bottom of the well, the pressure at the pumps does not change, the cause of the pressure decrease is not the wear of the bit support.

Formula inventions

Claims (2)

1, Roller bit containing paws with a flushing channel between them, mounted on the reverse cone pillars, mounted in the piston cavity of each paw, a spring-loaded piston with a stop rod, a plug in the flushing channel, which interacts with the stop rod, a wear sensor on the foot with a hydraulic a channel connected to the piston cavity and an overlapping overlapping element mounted on the outside that is interoperable with the reverse cone of the cone with allowable wear of the supports, characterized in that ensuring reliable information on support wear, the flushing channel is made with a ledge in the lower part, the piston cavity is made with a larger diameter stage, and the piston is placed with the possibility of moving it into a larger diameter piston cavity stage and communicating the hydraulic channel of the sensor and the flushing channel between the legs when unclamping and moving the cork to the ledge. 314655364 2. A chisel according to item I, the distinctive element is designed in the form of a ball valve with a covering element.