SU524904A1 - Core Chisel - Google Patents

Description

(54) COLUMN CHAIN

one

The invention relates to a rock-breaking tool, namely to roller cone bits.

The coring bit with a well, with core-forming cones, is well known, in my mine, from the acid sections with trunnions P-}. The disadvantage of the known is poor cleaning of the bottom hole from cuttings and formation of sludge plugs in the cavities.

The closest to the proposed is a coring bit, comprising a housing with flushing channels, inner and outer sections with trunnions, on. which are mounted, respectively, the core and well-forming cones. In this bit, the flushing fluid is directed through the channels in the housing to the cones, which prevents the formation of sludge plugs between the sections and the cones 2.

The disadvantage of this bit is the low mechanical speed of drilling. due to the lack of direct injection to the bottom of the well flow of flushing fluid,

The purpose of the invention is to increase the mechanical

speed of drilling due to improved

cleaning of a slab from slime.

This goal is achieved by the subject. AXE NAPF of each core-forming cone is rotated in the horizontal plane in

the direction of rotation of the bit with respect to the axis of symmetry of adjacently located holes “drill”, the powder is formed with jaiefi

sharp corner.

FIG. 1 shows the coring bit in section; in fig. 2 is a schematic of the location of the cutters and flushing channels at the bottom of the Dr Lot.

The chisel includes a housing 1 and an inner section 2 rigidly attached to it, three outer sections 3 and three pads 4, Core-forming rollers 6 are installed on trunnions 5 of inner section 2, and well-forming cones 8 on flush-mounted axles 7 of outer section 8 It is fed through channels 9 of a large cross section, which guide it strictly between the cones. To clean the cones 6 and 8 from the cuttings, a part of the wash is used. fluids I-is given through kangsha 10 of a smaller section i

In terms of the core-forming process, the cones 6 are rotated with respect to the well-forming cones 8 in the direction of the axis 5.

lot. The axes OO of the cones 6 form with the axis of symmetry 0 Oj the cones 8 the acute angle L Thanks to the indicated rotation of the core-forming cones 6, the space between them and the cones 8 is released, where the flushing channels 9 go. the flow of fluid directly to the bottom of the well,

In addition, rotation of the cones 6 eliminates the clamping of the rock between the end of the tooth of the cone and the core. This is achieved by simultaneous contact of the tooth with the face and the core at point A. With further rotation of the cone 6 to fully support the tooth A, A, the tip of the tooth from the point A moves to point Bj, which is from the core point B at a distance of b. In the known bits, the preservation of the core is ensured by the mixing of core-forming cones, which is associated with a decrease in their size, and, consequently, and efficiency.

The proposed layout of the sharoshe and flushing channels can be applied in bits with a different number of sharoko

W

Due to the specified performance of the bit, liquid is supplied to the bottom of the well and thus better cleaned of sludge. In addition, the well-forming core ensures the safety of the core without reducing the size and equipment of core-forming cones.

Claims (2)

1.Avt. St. No. 184763, cl. E 21 V 9/18, 1964 .. 2. US patent No. 2621026, cl. 175332, 1952, gate of core-forming cones relative