RU168413U1 - DRILL BIT - Google Patents

Abstract

The drill bit is a pneumatic percussion drilling tool and is intended for drilling permafrost sedimentary rocks with cleaning the face with compressed air. The drill bit comprises a crown body and matrix sectors reinforced with carbide cutters. The body of the crown is made with a threaded connection for connection to the core tube. The matrix sectors are mounted and secured to the end girdle of the crown housing by welding. Increased drill bit life. 1 ill.

Description

The utility model relates to a pneumatic percussion drilling tool and is intended for drilling of permafrost sedimentary rocks with cleaning the face with compressed air.

Known drill bit containing a one-piece housing of the tail and end parts. Moreover, the end part is reinforced with carbide inserts (A.S. USSR 1227799, class E21B 10/36, 1986).

During drilling, more rapid wear of peripheral carbide inserts occurs. Then, with hard-working carbide inserts still in the central part of the body, the crown becomes unusable as a whole. Especially economically disadvantageous, this design becomes with large diameters of the crowns.

Hard in technical essence to the claimed invention are carbide drill bits according to GOST 11108-70 type M6, CM5, CA6 and crowns SM9 (SKB "Geotechnika"). The disadvantage of the above crown designs is their one-time use, low resource, low drilling speeds. When drilling with cleaning the bottom of the air due to the effects of temperature heating, vibration, axial loads, torque, there is a rapid wear of solid inserts, sectors of the housing matrix. Moreover, the wear of the sectors of the matrix is faster and it is necessary to reject the crown with a workable body. The crown cannot be restored and has a low resource. Strength characteristics, materials used in the construction do not allow the use of forced regimes when drilling permafrost strata with cleaning the bottom of the air with frequent alternation of hard and soft rocks, resulting in low drilling speeds. A large consumption of crowns due to the low resource and low speeds increases the cost of one linear meter of wells and generally reduces the efficiency of drilling.

The closest in technical essence to the claimed utility model is a drill bit containing a removable ring and a solid body of tail and end parts, and the removable ring and end part are reinforced with carbide inserts. A detachable ring is screwed onto the crown case from the end part (AS USSR 334371, class E21C 13/02, 1972).

In the area of the threaded connection there are no carbide inserts, therefore, the destruction of the bottom of the well under the thread is difficult. In addition, the threaded connection is poked and there are problems with unscrewing the removable ring when replacing it. When carbide inserts wear in the end part, the entire crown housing becomes unusable.

The utility model solves the problem of increasing the efficiency of drilling large diameter wells by increasing the life of the drill bit.

The technical result is to increase the life of the drill bit due to the simplicity and ease of use of the device, which allows efficiently and with minimal cost to work on its restoration.

The indicated technical result is achieved in that the drill bit comprises a crown body and matrix sectors reinforced with carbide cutters, the crown body being made with a threaded connection for connection to the core pipe, the matrix sectors are mounted and fixed to the end girdle of the crown body by welding, and the crown body has a length that allows for several crown restoration operations.

The essence is illustrated by drawings of a General view of FIG. 1 and FIG. 2.

The drill bit comprises a crown body 1 and matrix sectors 2 reinforced with carbide cutters 3, the crown body 1 having a length that allows several crown restoration operations and is made with a threaded connection for connection to the core pipe. Sectors of the matrix 2 are installed and fixed on the end belt of the housing of the crown 1 by welding.

Concrete implementation example

The drill bit has the following distinguishing features:

1. The crown is prefabricated. The body of the crown and the matrix sector is made separately of steel pipe billets with different strength characteristics for the required diameter of core pipes, diameter of drilling, rock passable. On one side, a standard or special thread is cut on the casing for connection to a core pipe. On the other hand, a groove is made for installation and fixation by welding sectors of the matrix. The tube blank of the matrix sectors is made with an internal groove under the crown of the crown body. The sectors are reinforced with carbide cutters, and the sectors are cut into pieces. Sectors of the matrix are installed, fixed on the crown body in quantity and at a distance depending on the diameter of the drilling of passable rocks and connected at the last stage of manufacture by electric welding. The crown body has a length that allows for several crown restoration operations.

2. Cutting the worn sectors of the matrix, the housing can be used repeatedly. To do this, the groove-belt is again prepared on the body, on which new sectors are welded. For the manufacture of the housing and sectors of the matrix, materials with different characteristics are used. With increasing strength of the housing material, wear occurs much later than the sectors of the matrix. Having a supply of crown components (housing and sectors), restoration of crowns is possible in workshops and even in the field.

3. With repeated use of the housing and replacement of the matrix sectors, the costs of manufacturing, purchasing crowns are reduced, and the resource of crowns is increased.

4. The design of the crown allows for more solid brazing of carbide inserts into sectors, changing the size of the matrix sectors, blowing-out windows of the crown, internal and external gaps, the number of sectors in the crown, their arrangement, reinforcing the sectors with various hard alloys, using forced drilling modes depending on the diameter of drilling , physical and mechanical properties of rocks, mining and geological conditions, which indirectly allows you to increase the drilling speed.

During the final assembly of the structure, the crown sectors of the matrix, reinforced with hard alloy, are installed and fixed on the end girdle of the housing by welding. In the event of wear of the sectors and carbide inserts during operation, the restoration of the crown is done by cutting off the housing belt along with the sectors on the lathe, preparing a new belt with fixing new sectors on it. The body must have a length that allows several crown restoration operations. This allows you to increase the life of the drill bit.

Tests of the drill bit when drilling in frozen rocks of the 5th-7th drillability category with cleaning the bottom of the air showed the following work results in comparison with the work of standard crowns of the CM5 and CA6 type used:

1. The resource of the drill bit is up to 10-20 times (with a single use of the housing).

2. The mechanical drilling speed is up to 3-5 times higher.

3. Provides cost savings per linear meter.

4. The universality, simplicity of design, manufacturing technology, and the restoration of the drill bit is confirmed.

Such a drill bit is a simple and easy-to-use design with an extended service life and the possibility of efficient restoration with minimal costs.

Claims (1)

A drill bit comprising a crown body and matrix sectors reinforced with carbide cutters, wherein the core body is threaded to be connected to the core pipe, and the matrix sectors are mounted and secured to the end girdle of the core body by welding, characterized in that the crown body has a length allowing to perform several crown restoration operations.

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