DD287556A5 - DREHSCHLAGBOHRWERKZEUG - Google Patents

Abstract

The present invention relates to a rotary impact drilling tool having such a structural design of the rock-erosion elements and with such a length of the axial displacement of the socket with respect to the Gehaeuse, which ensure a Vergroeszerung the length of the Verschleiszteils the rock-erosion elements in the drilling process. The object is achieved by providing each rock-crushing element in the peripheral ring with a means for its detection in the socket, which is provided with a means for axial displacement with respect to the housing. The amount of axial displacement with respect to the housing is at least equal to the length of the wear portion of the rock-killing element. The present invention tool is most effectively used for sinking blast, petroleum, and geological exploration wells into highly abrasive rock. Fig. 1 {rotary impact drilling tool; Peripheral ring; Determination; version; Displacement, axial; Length; Verschleiszteil; Element, stone-crushing}

Description

To this end, it is desirable that the distance between the adjacent ring passages present on the side surface of the shaft of the rock-destructive element be based on the following relationship

cos α

where Ri is the radius of rotation of the rotary impact tool (in m), R _{2 is} the radius of the socket (in m), and α is an angle of inclination of each rock-destructing element in the peripheral rim to the face of the socket on the side of the demolishing rock between 45 and 89 " lies.

The upper limit of the inclination angle α of the rock-destroying element in the peripheral ring (α = 89 °) is determined by the Necessary to form a clearance between the borehole wall and the drilling tool to eventual To avoid jamming of the drilling tool in the borehole. The lower limit (α = 45 °) is constructive Considerations conditioned and based on the condition of maximum transmission of impact energy over the

Rock-destroying element chosen for mountain rock.

Furthermore, it is desirable that the length of the wearing part of each rock-destroying element be based on the

relationship

H = In-D-L

is selected, where L is the distance between the adjacent ring passages on the side surface of the shaft of the rock-destructive element (in m) and η 2 * 2 the number of ring passages on the side surface of the rock-destroying

Elementes are. The means for detecting each rock-destroying element in the peripheral rim with respect to the socket can be made as a socket

resilient material are carried out, the said steinszerstö. · ". , de element encloses and is arranged in a blind cavity provided in the socket, which communicates with the space between the socket and the housing.

Such a structural design of the mentioned means simplifies the design of the drilling tool and also gives the Possibility of avoiding its jamming in the borehole during installation and removal work. When deep holes are drilled in heavily worn mountain rocks, it is convenient to use a tool

apply, in which at the end face of the socket on the side of the rock to be destroyed supporting elements are fixed, whose height is the overhang of the rock-destroying elements beyond said end face out the same, wherein the means for axial displacement of the socket with respect to the housing is a slot connection ,

This offers the possibility of depending on the version under the effect of the reaction of the bottom hole on the support elements

to move up after the wear of the rock-destroying elements and expose them, i. Automatically compensate for the wear of rock-destructive elements during drilling.

It is advantageous that each section of the end face of the housing, with which when drilling the shaft of the gosteinzerstörenden Element in the peripheral ring cooperates, is executed rectilinear and to the longitudinal axis of said gosteinzerstörenden Element is perpendicular. Thereby, the highest efficiency of the transmission of the impact energy from the housing of this drilling tool to the

Rock-destroying elements and over these on the rock achieved.

In this case, the length of Abcchnittes the end face of the housing, with the drilling of the rock-destroying element of Peripheral wreath cooperates, greater than the length of the section of the end face of the shaft of said

be rock-destructive element, which cooperates with the mentioned portion of the housing.

This allows the rock-destroying elements in the peripheral ring to extend to the periphery of the tool at a Upward shift of the socket depending on the wear of the rock-destroying elements to move freely what

in turn, the constancy of the diameter of the tool urd thus the diameter of the drilled hole ensures.

It is advantageous that the entire surface of the passage cross-section of the mentioned in the version mentioned Durchgangsskanälo for passing the flushing medium less than the entire surface of the passage cross-section

the passageways provided in the housing for passing the flushing medium is.

By reducing the total area of the mentioned channels of the socket in comparison to the said channels dos Gohäusos is at the HindLrchleiton the flushing medium in the space between the housing and the socket overpressure

built up. This overpressure contributes to a pushing out of the socket out of the housing and prevents oinungeschlossenes folding the tool when friction between the borehole wall and the

Version during the execution of installation and removal work. embodiments

In the following, the invention will be explained in greater detail by means of concrete embodiments of an impact-driven drilling tool with reference to the enclosed drawings. Show it

1 shows a rotary impact drilling tool according to the invention; Fig. 2: a view A in Figure 1 on an enlarged scale. 3 shows a erfindosoßchchwerkzeug with a variant of the slot connection of the socket with the

Casing; 4 shows a part of the invention Wrokzougs for Schlagschlagbohren using a bushing of resilient

Material as a means for detecting the element destroying rocks in the peripheral ring.

The rotary percussion drilling tool according to the invention comprises a housing 1 (Fig. 1) for cooperation with a percussion and rotary device (not shown) and a cup-shaped socket 2. In the latter, central and peripheral channels 3 and 4, respectively, are made In these channels 3,4 are stone destroying elements 5 and 6, respectively. All the rock destroying elements 5, 6 have shafts 7 and 8, respectively, which cooperate with the end face of the housing 1. The socket 2 is With the aid of this, means 9 are provided for their axial displacement with respect to the housing 1. When sinking non-deep boreholes, said means 9 are made as a threaded connection, with a thread 10 cut on the sweeter side surface of the housing 1, while another thread 11 is performed on the inner surface of the wall of the socket 2.

In the housing 1 for passage of a flushing medium, at least one passage 12 is provided, one end of which communicates with a flushing medium source (not shown) and the other end communicates with the space 13 between the end face of the housing 1 and the inner surface of the socket 2.

In the barrel ing also at least one passage 14 for passing the flushing medium from the space 13 into the borehole 15 is executed.

In order to protect the rock-destroying elements 6 in Umfangskram during installation and removal of the tool against falling out on the entire length of the wearing part and thus avoid Verklemmuigen in the hole 1Q, each rock-destroying element 6 in the peripheral ring with a means 16 (Figure 2) his statement in the version 2 provided. This means is formed as a tracking element 17 with a spring 18 which is arranged in a blind cavity 19, which is executed in the socket 2 and is in communication with the peripheral channel 4. The locking element 17 cooperates with an associated annular passage 20 which is provided on the side surface of the shaft 8. The distance L between the adjacent ring passages 20 is set as follows:

where Ri is the radius of the rotary impact tool (in m) (R ₁ is a distance between the work axis and the contact point of the stone destructing element with the borehole wall), the radius of the socket (in m), and α is an inclination angle of each Stoinzerstörenden element 6 in Umfe ngskranz means to the end face 21 of the version 2 on the side of the rock to be destroyed. In order to avoid jamming of the tool according to the invention in the borehole 15, ie to ensure a clearance between the wall of the borehole 15 and this tool, the angle α is in a range of 45 to 89 °. The lower limit of the angle (α = 45 °) is selected based on the condition of the maximum transmission of the impact energy through the gamma destroying element 8 to the Gobirge rock.

The interval (0.8-1.0) in the above-mentioned relationship is chosen on the following considerations. The upper limit (1.0) ensures that the maximum diameter of the borehole is limited to the diameter of the tool according to the invention when drilling subsequent boreholes after compensating the wear of the rock-destroying elements 6. The design of the lower limit value (0.8) is thereby conditional that the compensation of wear with the transfer of the blocking element 17 (Figure 2) in the adjacent ring passage 20 must be made too often, if this word is less than 0.8.

In the presence of locking elements 17 in the tool, wtn selects the length H (FIG. 1) of the wearing part of the rock-destroying elements 5, 6 from the following relationship

where η & 2 is the number of the passages 20 on the side surface of the shaft 8.

Thus, the length H of the wearing part of the rock-destroying elements 5,6 is proportional to the distance L between the adjacent rings 20 and is determined by the number of these ring passages 20, while in the case of locking elements 17 (Figure 2) the greatest length H (Fig 1) of the wearing part of the gostein destroying elements 5, 6 is limited by a word which is determined from the following relationship:

This limitation follows from the fact that jamming of the tool when performing the installation and removal work must be avoided.

The Längo H of the wear part of the rock-destroying elements 5,6 agrees for the purpose of more complete utilization of the tool with respect to the stability of the rock-destructive elements 5,6 with the amount of axial displacement of the socket 2 with respect to the same 1 over

 The rotary impact drilling tool according to the invention operates as follows.

The tool is installed at a location where the borehole 15 is to be drilled. A pneumatic or hydraulic rotary hammer (not shown) disposed above the mandrel transmits rotation and impact pulses to the tool. The force in the axial direction is transmitted via housing 1 to torso-destructive elemento 5,6, which is supported on the bottom of borehole 15, while shafts 7 and 8 are supported against the end face of housing 1. After completion of the drilling of the borehole, the tool is lifted. The rock-destroying elements 6, which are housed in the peripheral channels 4, secured against falling out to the full length of the wearing part with Sporrelementen 17, whereby the possibility of jamming of the tool in the borehole 15 during installation and removal work is prevented. The size of the wear of the gostoinzorstörcnden elements 5.6, which is ge kommate when drilling the borehole 15, compensated by displacement dor version 2 with respect to the housing 1 by the

Version 2 screwed into the housing 1 via the thread 10. In this case, the locking elements 17 (Figure 2) are transferred into the adjacent annular passages 20 on the side surface of the shafts 6 of the rock-destroying elements 6, so that the wear compensates and the determined overhang of the rock-destructive elements 6 (Figure 1) with respect to the socket 2 is restored. Characterized in that the distance L (Fig. 2) is selected between adjacent annular passages 20, starting from the above-mentioned relationship, the constancy of the diameter of each subsequent borehole is pierced, which is pierced with the tool according to the invention, and the possibility of jamming of the tool in the borehole 15 (Fin 1) in performing the installation and removal work at any length H of the wear part of the rock-destroying elements 6 excluded.

If the drilling tool according to the invention for deep hole boring is determined by severely worn rocks, then the supporting elements 22 (FIG. 3) are attached to the end face 21 of the socket, whose height equals the transition of the elements destroying the rock elements 5,6 beyond said end face is. To ensure upward displacement of the socket 2 under the effect of the reaction of the bottom hole on the support members 22 depending on the wear of the rock-destroying elements 5,6 using the means 9 for axial displacement of the socket 2 with respect to the housing 1, which is a slot connection formed by grooves 23 on the outer side surface of the housing and protrusions 24 formed on the inner surface of the walls of the socket 2.

Each section 25 of the end face of the housing 1, cooperates with the drilling of the shaft 8 of the associated rock-destroying element 6 in the peripheral rim, is rectilinear and perpendicular to the longitudinal axis of said rock-destroying element 6. Such an embodiment of the end face of the housing 1 allows the Achieving the maximum efficiency in the transmission of impact energy from the housing 1 on the rock-destructive elements 5 and 6 and on this on the rock. Each section 25 has a length which is greater than the length d of the portion of the end face of the shank 8 of said rock-destroying element 6. This allows the rock-destroying elements 6 in the peripheral rim to move freely towards the periphery of the tool when the socket 2 is pushed upward, depending on the wear of the rock-destructive elements 5, 6, whereby the diameter of the tool and consequently the diameter of the borehole 15 to be drilled are kept constant becomes. For uniform supply of the flushing medium in the space 13 between the Gohäuso 1 and the socket 2, a plurality of circumferential channels 26 are executed, one end of which via a channel 27 with a Spulungsmediumsquelle (not shown) and the other end with the space 13 between Housing 1 and 2 socket is connected. In order to generate an excess pressure in the space 13, which contributes to pushing the socket 2 out of the housing 1, the total area of the passage cross-section of said channels 26 is greater than the total area of the passage cross-section of the through-channels 14 provided in the socket 2 are. Due to the existing pressure an accidental collapse of the tool is prevented in the occurrence of friction between the wall of the borehole 15 and the socket 2, when the installation and removal work is performed.

The rotary impact drilling tool according to the invention functions as follows.

Before the start of drilling the socket 2 is pushed out of the housing to the maximum length under the effect of its own weight or the excess pressure of the flushing medium. The rock-destroying elements 5 in the central ring, which have no means 16 for detection in the version 2, have also been pushed out of the latter up to the entire length of the wearing part. When setting up the tool on the sole, the gosteinzerstörenden elements 5 are inserted into the socket 2 until the shafts 7 come into contact with the end face of the Gohäuses 1 and the socket is supported with their Stützolomenten 22 against the sole. In this situation, all rock-destructive Elcmonto 5, 6 have an overhang equal to the height of the support elements 22. Axial loading, torque and impact pulses are transmitted to the tool from the pneumatic or hydraulic ram (not shown) located above the tool.

Under the effect of the above-listed loads, the rock-destroying elements 5, 6 penetrate into the rock and smash it, so that drilling of the borehole is made. When drilling a Vorschloiß happens the rock-destroying elements 5,6 in their height. Therefore, on the support members 22 of the socket 2, an increased force acts on the string of the bottom hole, and the socket 2 begins to move upwards, exposing the stone-disturbing elements 5, 6. With an upward shift of the version 2, the stone-disturbing elements receive a feed towards the periphery of the tool, which ensures the constancy of its diameter and thus the diameter of the borehole 15 to be bored. Thus, the Schlitzvorbindung the socket 2 with the housing gives the opportunity to perform drilling with automatic compensation of wear of the nuisance elements 5,6, which increases the working efficiency of the drilling tool.

To the design of erfiru. In order to simplify tooling and to prevent entanglement thereof in the wellbore 15 in the process of performing installation and removal operations, one may use a means 16 for detecting each obstacle zone element β of the peripheral rim with respect to the socket 2 which serves as a socket 28 (FIG ) is made of resilient material. The said rock-destroying member 6 enclosing sleeve 28 is housed in the socket 2 in an annular cavity 29 which communicates with the Rdum 13 between the socket 2 and the housing 1 in connection. The operation of the tool using the Buchson 28 mentioned is analogous to that described above. Thus, the Drehungsbohrwerkzeug erfindungsgomäß made possible by possible axial advancement of the socket with respect to the housing on the length of the erosion part of the stuttering torque Elomente an increase in this length and thus an increase in stability.

In addition, the tool according to the invention enables the boring with automatic compensation of the wear of the rock-destroying elements by means of the movable pre-binding of the socket with the housing, which considerably increases the working efficiency.

Claims (9)

A rotary impact auger tool comprising a housing adapted to cooperate with a percussion and rotation device and having at least one passageway for passing a purge medium serving to flush the drilling fluid out of the wellbore, and a cup-shaped socket having concentric rings and axially therein slidable rock-crushing elements having shanks cooperating with the housing, the socket being provided with means for its axial displacement relative to the housing and having at least one passageway for passing the mud flushing the drilling mud out of the wellbore, characterized in that each rock-destroying element (6) is provided with a means (16) for its detection in the socket (2) whose axial displacement length with respect to the housing (1) is at least equal to the length (H) of the wear eils of the rock-destroying element (5,6) is. 2. Rotary impact tool according to claim 1, characterized in that on the side surface of the shank (8) of each rock-destroying element (6) in the peripheral ring ring passages (20) are executed and that the means (16) for detecting said rock-destructive element (6) spring-loaded locking element (17) is formed, which engages with the associated annular passage (20) and is arranged in a blind cavity (19) provided in the socket (2) and in communication with a peripheral channel (4) where the rock-destroying element (6) fits. 3. rotary impact drilling tool according to claim 2, characterized in that the Abotand (L) between the on the side surface of the shank (8) of the rock-destructive element (6) existing adjacent annular passages (20) ₍ starting from the following relationship where R _{1 is} the radius of rotation of the rotary impact tool (in m), R _{2 is} the radius of the socket (in m) and α is an angle of inclination of each rock erosion element in the peripheral ring to the end face of the socket on the side of the rock to be destroyed and 89 °. 4. Rotary impact drilling tool according to claim 3, characterized in that the length (H) of the wear part of each rock-destroying element (5,6), starting from the relationship where L is the distance between the adjacent ring passages on the side surface of the shaft of the rock-destroying element (in m) and η Ss 2 is the number of ring passages on the side surface of the rock-destructing element. 5. Rotary hammer drill according to claim 1, characterized in that the means (16) for detecting each rock-destroying element (6) in the peripheral ring with respect to the socket (2) as a bush (28) made of resilient material, the said rock-destructive element (6) and disposed in a blind annular cavity (2! 3) formed in the socket (2), which communicates with the space (13) between the socket (2) and the housing (1). 6. rotary percussion drill according to claim 1, characterized in that on the end face (21) of the socket (2) on the Be hey of the rock to be destroyed supporting elements (22) are fixed, the height of the overhang of the gssteinzerstörenden elements (5,6) via said end face (21) is the same, the means (9) for axially displacing the socket (9) with respect to the housing (1) constitutes a prebond slot. 7. Rotary percussion drill according to claim 1, characterized in that each section (25) of the end face of the housing (1) with which during drilling of the shank (8) of the rock-destroying element (6) cooperates in the peripheral rim, is rectilinear and to the longitudinal axis said rock-destroying element (6) is perpendicular. 8. Rotary hammer drill according to claim 1, characterized in that the length ()) of the portion (25) of the end face of the housing (1) with which the rock-destructive element (6) cooperates in drilling in the peripheral rim, is greater than the length (d ) of the portion of the end surface of the shank (8) of said rock-destroying element (6) which cooperates with said portion (25) of the housing (1). 9. A rotary impact drilling tool according to claim 6, characterized in that the entire surface of the passage cross section in the socket (2) said passageways (14) for passing the flushing medium is less than the entire surface of the passage cross section of the housing (1) provided through channels (12 ) for passing the flushing medium. For this 3 pages drawings Field of application of the invention The present invention relates to the drilling technique and more particularly relates to a rotary impact drilling tool. The rotary impact auger tool of the invention is most suitably used for sinking explosive, petroleum and geological exploration wells in highly abrasive rock. Characteristic of the known state of the art Known is a tool for rotary impact drilling (SU, A, 284918), which contains a housing, which serves for cooperation with the impact and rotating device, and a cup-shaped socket. In this version arranged in concentric rings and axially displaceable rock-destroying elements housed with shafts, which cooperate with the housing. The socket is provided with a means for its displacement relative to the housing. The housing and the socket each have a passageway for passing a flushing medium, which serves to flush out the drilling mud from the wellbore. The known tool can be used for drilling boreholes in weakly and heavily worn rocks. However, the use of this tool is difficult in heavily worn rocks because the rock-destroying elements due to limited length of the wearing part wear out quickly and no means are available that allow to compensate for the wear of the rock-destructive elements. This requires a low stability of the drilling tool. Object of the invention The invention aims to increase the stability and the working efficiency of the rotary impact drill. Explanation of the essence of the invention The invention has for its object to provide a rotary percussion drill with such a constructive design of the gosteinzerstörenden elements and with such a length of the axial displacement of the socket with respect to the housing, which ensure an increase in the length of the wear part of the rock-destructive elements in the drilling process. According to the invention this object is achieved in that in the rotary impact drilling tool, comprising a housing which is intended for cooperation with a percussion and rotation device and at least one passage channel for Hindschleloiten serving a Horusionspülon the drilling mud from the well irrigation medium, and a cup-shaped Socket having housed therein concentric rings and axially displaceable rock-destroying elements with shanks, which cooperate with the housing, wherein the socket is provided with a means for their axial displacement with respect to the housing and at least one passage for passing the flushing of the drilling mud from the Borehole has the serving flushing medium, according to the invention, each rock-destroying element in the peripheral ring is provided with a means for its detection in the socket whose axial displacement length with respect to the housing m at least equal to the length of the wearing part of the rock-destroying element. It is expedient that on the side surface of the shaft of each rock-destroying element in the peripheral ring Ringdu.'chlässe are executed and that the means for detecting said rock-destroying element is designed as a spring-loaded locking element which comes with dom associated Ringdurchla'S engaged and in a blind cavity is arranged, which is provided in the version and is in communication with a peripheral channel in which the gosU inzerstörendo element finds place. This makes it possible to protect the rock-destroying elements in the peripheral ring against falling out to the full length of the wearing part in the implementation of installation and removal work with the drilling tool according to the invention and thus oine jamming of the tool in the borehole to avoid.