SU832021A1 - Core bit - Google Patents

Description

(54) COLUMN CHAIN

one

This invention relates to a drilling technique, namely roller cone bits.

According to the main av. St. No. 713975 is known a coring bit containing sections, on which squash and core samples are fixed, located around the perimeter at the vertices of the pentagon, while the wells forming the cones are located at its three vertices, and the connecting lines divide the pentagon into three triangles Г1 .

However, since both core samples and cone bits in the bit are located asymmetrically with respect to the bore holes of cones, during the drilling process during core formation, asymmetric loads are transmitted from the core samples to the sharks lek. tsimi sharoshkalsh, after which it is destroyed by the armament of the bit cones.

The purpose of the invention is to increase the core output of a nominal diameter by centering it relative to the longitudinal axis of the core bit and eliminating the fracture of the core during the drilling process, as well as maintaining the mechanical drilling speed.

This goal is achieved by the fact that the core bit is equipped with wear-resistant inserts for drilling the core mounted on the bit section with core-forming cones in the adjacent area

0 bore-forming mills, with wear-resistant inserts for core drilling located above the lower rock-cutting edges of the mills.

Figure 1 shows the column 5 chisel, bottom view; in fig. 2, section A-A in FIG. 1, in FIG. 3 section bb in fig. one.

The core bit includes a housing 1 With a connecting thread 2, flushing channels 3 and a core-receiving channel 4, connected to the inner section 5 with trunnions 6, with the outer sections 7 with Bis axles with two outer linings 9.

five

The core-forming cones 11, 12 and well-forming cones 13, 14 and 15, respectively, are installed on the trunks b and 8, hard-alloyed 10, respectively. Core-forming cones 0 11,12 and well-forming cones

13,14 and 15 are armed in the form of teeth 16. Wear-resistant inserts 17 are installed on the inner section 5

In the process of drilling, rotation from the drilling machine through the cylinder of drill pipe and the coring device, which is connected via a connecting thread 2 to the core bit body 1, through the inner section 5 with trunks b and the outer section 1 with trunnions 8. is transferred to the cones 11 -15.

The core bit works after

blowing way.

The core samples 11,12 and the borehole forming 13-15 cones, mounted respectively on the pins 6 and 8, rotate, destroy the bottom-hole rock with the teeth 16.

The borehole roller cutter 13-15 processes the peripheral portion of the annular slab, the caliber of the borehole diameter D.

The core is formed in the process of drilling with core-forming scissors 11, 12 and enters through a core-receiving channel 4 with a diameter d, and wear-resistant inserts 17 installed on the internal section 5 of the core bit above the lower rock-breaking edges of the teeth 16 of core-forming cones 11,12 ensure centering of the core of the nominal channel 4, prevention of core fracture while maintaining constant mechanical drilling speed, since they do not participate and do not contact in the process of core formation at the bottom of a well

M

with the bottom hole rock, does not affect the reduction of the mechanical drilling rate.

The presence of wear-resistant inserts installed on the inner section of the coring bit above. lower rock-cutting edges of core samples of cones, provides an increase in the output of the core.

invention formula

Claims (2)

1.Kolonkovoe chisel on the author. No. 713975, characterized in that, in order to increase the yield S core of nominal diameter by centering it with respect to pro. the axial axis of the coring bit and the elimination of the core fracture in the drilling process, it is equipped with wear-resistant bins for drilling the core mounted on the bit section with core-forming cones in the area of the adjacent well-forming cones. , 2. The column chisel according to claim 1, which means that, in order to preserve the mechanical speed of drilling, wear-resistant inserts for core drilling are located above the lower rock-breaking edges of core-forming eaves. Sources of information taken into account in the examination 1. USSR author's certificate No. 713975, cl. E 21 V 9/18, 1966 (prototype). -one" /five 1