UA32569U - Crown for rotary-percussion drilling of wells - Google Patents

Abstract

Drill crown has body, central and peripheral pins, cylindrical slots with additional reborings, blow channel with additional slot.

Description

Description of the invention

A useful model relates to mining, in particular to drill bits for shock-rotation 2 drilling of wells with submersible pneumatic hammers.

An analogue is the KNSh-105 screw drill bit | (Drill bit: AS USSR Mo1227799, MKY E 21 B 10/36; Announced 04.18.84; Publ. 06.30.86. Bull. Mo16)1.

The drill bit contains a body in which the central and peripheral pins are installed, along the perimeter of which there are cylindrical grooves for the removal of mud, in which the blowing channel passes. She 70 is characterized by low stability and drilling speed.

The closest technical solution, chosen as a prototype, is a drill bit, containing a body in which central and peripheral pins are installed, along the perimeter of which there are cylindrical grooves for the removal of mud, in which a blowdown channel passes. K-1008 Ikhrutsky A. A., Kavarma I. I. A new rock-crushing tool for drilling wells at Kryvbass mines// Development of mines 12 mine. - Kryvyi Rih: Kryvyi Rih Technical University, 2002. - edition. 78. - P.143-147).

The disadvantage of the known design is the inefficient location of the pins on the working surface of the crown, the large diameter of the pins, which significantly reduces the drilling speed when using low-power submersible pneumatic hammers. Another disadvantage is the large grooves for removing sludge, which reduce the effectiveness of cleaning the bottom space.

The task of the useful model is to improve the design of the drill bit by improving the conditions for removing mud and increasing the volume of rock removed in one blow, which allows you to increase the speed of drilling and reduce the wear of the bit.

The task is solved due to the fact that the drill bit contains a body in which the central and peripheral pins are installed, along the perimeter of which there are cylindrical grooves for the removal of mud, in which one blowing channel passes. -

According to the useful model, cylindrical grooves are made with additional grooves, an additional groove is located at the outlet of the blow-off channel, the radius of the pins is taken from the following condition: 1 2 in ЕЯ АЙ Ф "nowhere to catch zo e; (se) where E is the Young's modulus of the rock; oh

E:en - the radius of the pin;

A - impact energy; si

Zo Fe; - auxiliary variables, which are defined as follows: "about 2.ts. same sh-- p. P-2-sh so « - for rocks of medium strength with 70 vr-lov Vo. rut-oriv8v.Oyu 12849. pr) 8th - for rocks of increased strength at vo - 105 Dovv.1079.0u -00293.0yu 1888. or sor - strength limit of the rock under all-round compression; c Ok - diameter of the crown; with also - Poisson's ratio of the breed; c - compressive strength limit of the rock; 1 n - the share of the work performed by the force E from the deformation of the sealing core and transferred from the sealing core to

F 20 rock destruction; so pe 2. te 341-2 -t while the number of pins is determined from the expression: z-. ZI; , 4. Een with | and the area of the grooves for removing sludge is determined from the ratio:

Er - (300 - 900)--35. where 7 is the specific mass of the rock and the radius of the cylinder groove is determined from the ratio: v-v

KI and the angle of rotation of the grooves and the channel is equal: 65 schu -18.3- 0-50)

The claimed utility model is illustrated by the following diagrams, where Fig. 1 shows a crown, general view; in Fig. 2 - the working surface of the crown; Fig. 3 shows an additional groove of the purge channel.

The crown is implemented as follows.

The drill bit is designed for percussive-rotary drilling of wells with submersible pneumatic hammers with axial exhaust of spent air.

The drill bit contains a housing 1, in which the central Z and peripheral 2 pins are installed, along the perimeter of which cylindrical grooves 5 are located for removing the mud. There is one blowing channel 4 in the body 1. In order to improve the conditions for removing sludge, the cylindrical grooves 5 are made with additional 7/0 grooves, at the outlet of the blowing channel 4 there is an additional groove b. An additional groove 6 at the end of the blowing channel 4 allows for uniform distribution of air in the slaughter zone, which improves the removal of drilling mud.

In order to increase the volume of rock removed in one blow, the radius of the pins 2, З is taken from the following condition: 1 7

Hey A

75 Kenitz 1 37's (Y - ' m» voi de E - Young's modulus of the breed;

Een is the radius of the pin;

A - impact energy;

Fe; - auxiliary variables, which are defined as follows: 2.ts. fe No p. П-2-ш со - for rocks of medium strength з 2 - 5-10 .18.107.бю -001886.02 -12849.OK - for rocks of increased strength во - 105 Довв.1079.0у -00293.0ю 1888. ор ш со межа rock strength under comprehensive compression;

Ok - the diameter of the crown; yin ya - Poisson's ratio of the breed; yuyu c - compressive strength limit of the rock; se pt - the share of the work performed by the force E from the deformation of the compaction core and transferred from the compaction core to the destruction of the rock, according to |11: ptp- z 341-2 -t "

The approximate number of pins is 2, Z t--9 - two s 4 Ben. "" Layout of the working part of the crown

As the basic method of placing pins 2, C, the method of Yarn was chosen - pins 2, C are placed

Ring-shaped zones. The disadvantage of this technique is that it does not take into account the possibility of working together with pins to destroy the rock. Therefore, the author, based on the basic methodology, proposed the following solution. ko Radius of the outer annular zone: c) o Nnav - 5 Azn (22 Number of internal annular zones: (Te) Ok Te and --- щ-- 2 no

Man - --3- y y y de р - the step of installing pins when successively deepening into the rock, mm s р-201.v de Р, - the radius of the punch hole on the surface, m (11: 1 7 yu di Ey Gota

Z. I. BenZ 0-2. that where E is the force of impact, which is applied to one pin 2, Z, H 11: - 2. BUT , because example: Ken "lit

The radii of the inner ring-shaped zones when moving from the edge to the center:

In, "pEeonnv | 02-05 95 Approximate number of pins 2, З for each ring-shaped zone, including the outer one:

Piani 70 where 7 is the total number of pins 2, 3.

The angle of installation of pins 2, Z for the |th ring-shaped zone: zBO sa B Za 1

Further, according to the calculations, pins 2, C are located in ring-shaped zones. The mutual angle of rotation 72 between the pins 2, Z of adjacent ring-shaped zones is chosen so that the distance between two or three pins is equal to the step of setting the pins at the same time as 2 or Z pins are buried in the rock, respectively.

Pin installation step 2, C with simultaneous sinking of two pins into the rock

Eid - 11 Sv

The step of installing pins with simultaneous penetration into the rock of three pins 2, Z dz.

Elements of the crown, which are responsible for removing sludge

The diameter of the purge channel 4 is equal to the diameter of the exhaust channel on the impact piston of the submersible pneumatic impactor. The angle of inclination of channel 4 is 592-302,

The total area of the grooves 5 is determined from the expression

Ek - Y300-9003--35. in o, where 7 is the specific mass of the rock

The number of grooves 5 is equal to the number of pins 2 of the outer annular zone.

The radius of the cylindrical groove 5 (22) in - TE (Se)

KI iv) where 8, - the area of a single groove is 58, - Ek /t

Angle of rotation of grooves 5 and channel 4 cm p-18.7-0-50) p

Additional grooves 6 improve the efficiency of sludge removal due to the redirection of the flow of compressed air in the area with low speed. The diameter of the additional groove is equal to the diameter of the blowing channel, the angle of inclination is -10-409, "

The crown works like this. t0 The shank of the body 1 is struck by the impact mechanism (plunging pneumatic impactor), the energy З с of which is transmitted to the central З and peripheral 2 pins. Under the action of this blow, pins 2, Z destroy the rock in

From" the drilling process. Next, through the channel in the piston-impactor of the plunging pneumatic impactor, the spent compressed air enters the underbite zone through the blow-down channel of the crown 4. There, picking up particles of drilling mud, through enlarged grooves for removing mud 5, it brings them to the surface through the annular space.

The technical efficiency of the model consists in better cleaning of the underbore space and an increase in the volume of rock and chipped in one blow, which allows to increase the speed of drilling and reduce the wear of the crown. km This is due to the enlarged grooves for removing sludge and an additional groove at the end of the central blowing channel, as well as taking into account the group work of the rock destruction pins when they are located on the working surface of the crown.

Ge 20 Sources of information 1. Protasov Yu. I. Theoretical foundations! mechanical destruction of rocks. - M.: Nedra, 1985. - 242 p.

Me, 2. Pryadko Yu. A. development of the technique of designing crowns with cylindrospherical carbide inserts for rod drilling: Autoref. thesis Ph.D. technical of science - Novosibirsk, 1988.

Z. Zygeles R. M., Strekalova R. V., Mustafina N. N. Selection of the optimal sizes of rock-destroying 22 sediments and their rational placement on the face surface 136-149 Trudyi VNIIIBT 1975 p.

Claims (2)

Formula of the invention 60 A drill bit containing a body in which central and peripheral pins are installed, along the perimeter of which cylindrical grooves are arranged for the removal of mud, in which one blowing channel passes, which is characterized by the fact that the cylindrical grooves are made with additional grooves at the outlet of the blowing an additional groove is located in the channel, the radius of the pins is determined by the formula: b5 EV AY Esn x0.85157.---- y, x s, where E, is the Young's modulus of the rock; En radius pin; DA - impact energy; and auxiliary variables, which are defined as follows: from 1 Fo. gels at 1-2 p.). so - for rocks of medium strength: F,-105.I8.103. р -0.01886.Yuk 12849 pk - for rocks of increased strength: Ф,-1075.(286.107.рк -0.0293. рю ВИВ Ок св limit of strength of the rock in all-round compression, р: diameter of the crown, n - Poisson's ratio of the rock , in c - compressive strength limit of the rock, t - the share of the work performed by the force E from the deformation of the compaction core and transferred from the compaction core to - destruction of the rock, Ph.D. p-Z-ZSHVUSH University of Applied Sciences" (2) 3. n -E. and at the same time, the number of pins is determined from the expression: i-th (8), iv) to - -t, and en cm 3o, and the area of the grooves for removing sludge is determined from the ratio: со Е, - (300 -900)--35. y, where y is the specific mass of the rock, and the radius of the cylindrical groove is determined from the ratio: 2. 5 shsh with Ki -I--t, p ;" " and the angle of rotation of the grooves and the channel is equal to o -16.u- 00-50, with ko 1 (22) (32) s 60 b5