SU91905A1 - Roller bit for well drilling in a planetary way - Google Patents

Description

The effectiveness of planetary drilling increases dramatically in the presence of lateral milling of the rock. Therefore, it is advisable to carry destructive tool edges away from its axis. At the same time, the absence of the need for destructive edges in the middle of the bit gives the opportunity to improve the design of the bit support and direct the stream of clay solution directly to the points of contact between the teeth of the cones with the bottom hole.

The development of these positions is proposed for drilling wells with a planetary roller bit, which is characterized by the fact that the roller has one row of zigzag-shaped teeth with verpets in the form of a flat trapezium, and the teeth provide a hook to the end of the recess to capture the rock.

On (1pp 1 pzobrazho bit chisel in a partial longitudinal section; in Fig. 2 - the kid in front of the bit cutter; in Fig. 3 - the rear view of it.

FIG. 1 denotes: (1) - bit body, (2) - lumpy hard metal reamer cutter, - 3 - roller cutter, (4) - ball bearing-lock, (5) - bit removable paw with an axis for bearing, 6 - ball support, (7) - plug for ball lock.

The bit cutter is provided with teeth, the tops of which are made obviously blunt, in the form of a flat trapezium. The teeth slightly expand at the base.

(ft 2). The tooth of such a shape keeps, until complete wear, the ability to effectively destroy the rock, while the triangular teeth of cippels in drill bits in strong stalls quickly become dull, and their triangular shape makes it possible for the wear of the tooth to drastically increase the bearing surface to 1. drilling efficiency.

The cutter cones have one row of zigzag teeth. For a better grip of the rock during lateral milling, the tooth of the cones is provided with notches at the end.

The chisel support has a ball lock (or roller lock). Wto is achieved by broadening the support, due to its shortening.

The cutters are so positioned that the washing face is directed directly to the zone of contact between the cutter teeth and the rock, which contributes to the effectiveness of the bit operation.

To calibrate the borehole diameter, protect the paws of the bit from the borehole wall, the bit body is assembled with several parallel rows of incisors (2) of the hard alloy.

Subject invention

1. Roller bit for clamping boreholes using the bucket method, H5 bearing with a ball or roller lock, characterized in that the roller bits have one row of zigzag zoos with vertexes in the form of a flat trapezoid, and the tooth itself is provided with notches at the end to grip rocks with lateral milling.

. 2. A chisel in accordance with p. 1.0 tonnes of liter, so that to calibrate the diameter of an alloy, its body has several parallel rows of cutters made of hard alloy.

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