JPS6332957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mine wall drilling device, and more particularly to a semi-expendable shaped explosive device.

The semi-expendable mine wall drilling device has an elongated supporter,
A radially oriented capsule-shaped filling body is fixed along this support. This assembly is inserted into the well to a certain depth, at which depth it is desirable to drill a hole in the well casing, and after the explosion the supporter is raised to the ground surface, where the supporter now collects some fragments of the filler case. The debris remains attached to the supporter. The portion of the packing case that is ruptured by the explosion constitutes the debris that is retained within the well, but the amount of this debris is limited due to the recovery of the supports.

The supports used are often in the form of elongated strips with mounting holes adapted to receive fillers. For some applications, it is desirable to have large diameter and many perforations. Such applications refer, for example, to the preparation of enclosed production areas for the formation of gravel fills. These high packing density devices have many limitations that cannot be overcome by the prior art. Supports with spirally twisted strips have been devised to obtain several radially oriented filling bodies.

Conventional supports cannot be adapted to dense packings because of their design and the resulting lack of ruggedness. Such supports are twisted over their length after the filling has been applied. Since the mounting hole is also torsionally deformed, the filling body may not retain sufficient strength. In addition to this, if the known device is used for well casings of different diameters, the same implementation effect cannot be obtained everywhere. For large diameter well casings,
Only a filling body leaning against the casing shows a good effect. Other fillings whose front surface is relatively far from the wall lose a significant part of their effectiveness. In pit wall drilling equipment for preparation of gravel filling, it is particularly important to obtain large diameter boreholes that are spaced as regularly as possible (for example 2 cm) in all directions. For example, using conventional equipment that can reach a density of four holes per foot, it is possible to obtain twice that density by lowering two of these equipment to the same depth. It will be. However, it is not known how to insert them to obtain regularly spaced perforations.

Therefore, it would be desirable to have a punching device that can accommodate a high density of fillers and provide an excellent topography at a low manufacturing cost. It is important to have this low price;
Generally, after an explosion, the supporter becomes deformed, becomes brittle, or cannot be reused.

It is an object of the present invention to provide a mine wall drilling device particularly suitable for obtaining regularly arranged, large-diameter, high-density drilling.

Another object of the invention is to provide a wall drilling device in which the packing support is particularly simple and strong.

A disadvantage of previously known semi-expendable wellbore drilling equipment is that a large amount of debris remains in the well after an explosion.
In fact, the explosion ruptures all the packing casings into pieces, leaving only parts of these casings on the supports, which are fixed in the supports. This drawback is particularly important for devices with dense packing.

Another object of the invention is to reduce the amount of burnt debris produced in such equipment.

In the present invention, a mine wall drilling device comprises: an elongated supporter having a series of flat opposing portions that are angularly offset about the longitudinal direction and provided with longitudinally spaced attachment holes; and an explosive charge body having a sealed case fixed to a supporter in a mounting hole with an axis substantially perpendicular to opposite sides. An electrically actuated detonator is coupled to the charge for igniting them. Each of the supporter parts has two mounting holes spaced longitudinally such that the distance between their centers is less than their maximum diameter perpendicular to the axis of the explosive charge; The explosive charge case has a rear portion of reduced diameter that engages within the mounting hole such that two explosive charges are secured to each of the support portions with their axes oriented in radially opposite directions. . The supporter comprises a tube, the continuous portion of which is flattened at its opposite ends in a predetermined radial direction to form the flattened side portion.

The detonator has an electrically actuated fuse for igniting two detonating cords, one of the detonating cords having a series of first explosive charges each consisting of a first explosive charge in each section; Each section is connected to a series of second explosive charges comprising other explosive charges in the section. The two codes are fired simultaneously by one detonation relay if necessary to be cycled by another detonation relay. The case of each filling body has a metal body, which has sufficient resistance for installation, and has a cover made of a brittle material, such as ceramic, for example. The rear part of the packing body has a slot for the passage of the detonating fuse.

The metal body of each said filling body consists of extruded steel, which steel is such that the main part of the body is open to the detonation effect, while their rear part remains attached to the supporter after detonation. The rupture resistance in the axial direction of the explosive charge is greater than in the direction perpendicular to the axis. For large diameter wells,
A spacer is installed between the supporter and the base of the filler case. Each spacer includes a reinforced annular portion adapted to receive a rear portion. Within this annular portion, a spacer is provided in order to reduce the well fluid volume within the annular portion while ensuring proper transmission of the fuse detonation in the direction of the packing by proper adhesion of the fuse to the packing case. , having a lateral portion adapted to be inserted into the fuse passage slot when the rear portion of the filler case is placed within the spacer.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a wall drilling device 11 is suspended from the end of a cable 12 and positioned within a well 13, which is covered by a well casing 14 extending through the earth's surface 15. In order to start creating an area containing hydrocarbons, it is necessary to prepare the area for filling with gravel, which requires digging holes in the area in a dense manner and with a large diameter. A mine wall drilling device made for this purpose connects a conventional cable head 16 via a casing collar locator 17 to determine the exact depth.
is attached to. The mine wall drilling device comprises an upper head 18, an adapter 20, one or more connecting members 21, a supporter 22 supporting one or more explosive charges 23 and a lower endpiece 24.
Consisting of

In FIGS. 2A and 2B, the cylindrical upper head 18 has a thread 26.
is screwed onto the lower end of the casing collar locator 17. An electrical connector 27 is mounted in an insulating seal within the shaft of the upper head 18 and is connected to the bottom of an insulated conductor 28. Said head 18 is attached to an adapter 20 by means of screws 30, for example, and this adapter 2
0 consists of a sleeve 31 welded off-center to a plate 32. A side catch 33 is welded between the sleeve 31 and the plate 32. Said head 18 is located off-center in the hole, so that the casing collar locator 17
is preferably located near the wall of the well casing 14 to provide a better signal. A plate 32 is connected to the supporter 22 via a connecting member 21. The connecting member 21 is best illustrated in FIG. 3 and consists of two half-shells 35 and 36;
The half-shells are attached to each other by screws 37. Each half-shell (e.g. 35) consists of a piece of bent iron with rounded ends and a square rail 40 welded to it, so that after assembly the two half-shells are located between the head 18 and the support 22. Limited angular movement is possible. Furthermore, each half-shell has a transverse projection 41 on which the detonating cord or detonating relay and the electrical conductor are fixed.

Supporter 2 shown in FIGS. 4 and 5
2 includes a series of planar sections that are offset by 90 degrees with respect to the longitudinal axis AA'. Each planar section (FIG. 4) has two mounting holes 44, 45 spaced apart longitudinally to receive the rear portion of the explosive charge. Each mounting hole, such as mounting hole 44, has two transverse planes 46, 4
7, and an inclined surface 48 for preventing the explosive charge body attached thereto from rotating around its axis.
It has 49. The distance d between the centers of the two mounting holes 44, 45 is clearly smaller than the maximum diameter of the filling body cut at right angles to the axis of the filling body in order to achieve a high packing density. The filling bodies are then mounted in opposite directions on both sides of each supporter section. Mounting hole 4
4 and 45 are preferably as far apart as possible,
It is preferred to leave enough minimal metal strips between them to ensure attachment of the filler.

In one embodiment, the distance d is approximately 2 cm for a 5 cm diameter filler and the metal strip left between the two attachment holes has a width of 8 mm.

The supporter 22 (FIG. 5) has a suitable diameter (4 cm in the embodiment described above) flattened along two radial directions to form a continuous planar opposing portion.
It is constructed from steel tubes. For this, the tube is placed in a press to flatten a section with a force of about 100 tons, then the tube is advanced the length of that section, before the next section is flattened. The tube is rotated 90 degrees around its axis.

Prior to engaging the filler in the mounting hole, a first detonating cord 62 is placed into the slot 60 of the series of first fillers formed by the top filler of each section (FIG. 2A). Two detonating cords 63 are placed in the slots 60 of a second series of charges consisting of the other charge (bottom charge) of each section. Each detonation code 6
2 and 63 are arranged in a spiral around the carrier and extend downward with respect to the detonation relay 64. Detonator 6 is activated by another detonator code 65.
The detonation relay 64 connected to 6 has two cords 6
2 and 63 at the same time. The igniter 66 consists of two electrical ignition wires 67
and 68, which wire includes an insulated conductor 28 and a second conductor 7 connected to ground.
0 along the carrier 22, respectively. The detonator 66, detonator cord, and all explosive charges 23 are ignited by passing a suitable electrical current through the cable 12 between the connector 27 and the ground.

In conventional methods, ignition is preferably initiated from the bottom end of the device. When ignition actually starts from the opposite direction, cinders accumulate on the lower explosive, which is not ignited due to a partial ignition error in the device.
Equipment may become stuck in the well casing when attempting to lift the equipment to the surface.

Connecting member 21 for long distance well drilling
It is possible to fix the ends of several supports 22 together. two codes 62 and 63
In order to simultaneously detonate the cords, a detonation relay is inserted at the same level as each connecting member 21, said relay being synchronized with the detonation of these two cords at the beginning of each supporter 22.

The supporter 22 is fixed to the lower end piece 24 by a connecting member 71 which is the same as the member 21 in FIG.
The lower end piece 24 consists of a tube 72 .
2 is installed in the connecting member 71, so its head is flat so as to form a flat connecting part 73. A window 74 is formed within the tube and a plug 75
is welded to its lower end. three rods 76
are welded by their ends at the top and bottom of tube 72 so that their middle portions are spaced from its centerline and the bottom of the device is centered in the well casing. detonator 66
is installed inside the tube 72.

As shown in detail in FIGS. 6 and 7, each filling body 23 consists of a metal body 52 and a cover 53 sealed on the body. The body is made of metal to firmly adhere to the supporter. The cover consists of sintered alumina that explodes into small pieces. shaft
The body 52 with BB' contains an explosive mass 50 whose front face is recessed in the shape of a cone covered with a metal liner 51.

The body 52 has a rear portion 56 (base), which is connected to the cylindrical portion 5 through the truncated conical portion 54.
It forms a thin part connected to 5. base 5
6 has a shape corresponding to the mounting hole and has two corresponding flat parts 57 and 58. A transverse hole 61 is formed in the base 56 which is adapted to receive a slot for passage of a detonating cord and a locking pin. Preferably, the slot 60 extending into the frustoconical portion 54 is connected to the flat portion 57,
It is inclined at approximately 45 degrees with respect to the plane of 58. The body is formed by extrusion, for example, by plastic deformation of a steel cylinder by the action of a punch moved in the axial direction of the body with an appropriate force. This extrusion is carried out in such a way that it exhibits an anisotropic mechanical resistance, that is, a resistance greater in the direction of the axis BB' of the explosive charge than in the direction perpendicular to the axis BB'. The explosion thus fractures the body 52 along its longitudinal line and causes it to burn off its axis, but remains attached to the base 56 as shown in FIG.

The steel used must have sufficient strength and malleability to avoid being broken into small pieces by explosion. Low brittle steels of type XC32F, XC18F and 20MB5 are good. Appropriate heat treatment can improve the properties of selected steels.

The mine wall drilling equipment shown in Figures 2A and 2B is constructed using a series of casings, e.g.
inch) casing. Outer diameter is 24.5
cm (95/8 inch casing), the same supporter 22 is used, but the explosive charge body 23 reduces the distance between its front and the casing. The spacer 80 shown in FIGS. 8 and 9 has an annular portion 81 with a reinforced thickness and an explosive charge in the annular portion 81. The base 56 of the body case fits into it, and the rear part 82 of the thin section corresponds to the mounting hole 44 or 45 of the supporter 22.The annular part 81 has a transverse hole 88, which hole 83 is inserted into the spacer. Lock pin 85 (10th
(Fig.) has come to be accepted. then part 8
2 has a transverse hole 84 adapted to receive a locking pin 86 for fixing the spacer on the supporter 22.

A lateral portion 87 is provided within the annular portion 81;
This portion 87 is adapted to be inserted into the slot 60 which is used as a passage for the detonator cord when the base of the case is placed within the spacer 80. The front face of this lateral hole holds the detonating cord over its entire length at the bottom of the slot 60;
This ensures proper detonation conduction of the cord to the explosive mass of the explosive charge. Furthermore, the presence of this lateral portion minimizes the amount of fluid within the spacer. Without this lateral portion, the spacer would require a large amount of fluid to fill the cord passage slot 60. This fluid then transmits the explosion to the wall of the spacer, which may fracture the wall and cause the base of the explosive charge case to be lost within the well. Large diameter wells require these spacers, and the embodiments described above can significantly reduce the amount of debris left within the well.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the mine wall drilling device of the present invention inserted into a hole, FIGS. 2A and 2B are partial views of the device in FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 of FIG. Figure 4 is a detailed view of the supporter of this device, Figure 5 is a perspective view of the explosive charge supporter of this device, and Figures 6 and 7 are longitudinal sectional views and front views of the explosive charge used in this device. , FIG. 8 and FIG. 9 are a cross-sectional view and a vertical cross-sectional view of a spacer used in a large-diameter well casing, and FIG. 10 is a cross-sectional view of the explosive charge in this device after detonation. 11... Pit wall drilling device, 12... Cable, 1
4...Well casing, 22...Supporter, 23
...Explosive filling body, 32...Plate, 44...Mounting hole, 62, 63...Code.

Claims (1)

[Scope of Claims] 1. An elongated supporter comprising a series of supporter portions having flat opposing portions angularly offset about a longitudinal axis and provided with longitudinally spaced mounting holes; electrically actuating an explosive charge having a sealed body secured to the support portion within the mounting hole having an axis substantially perpendicular to the support portion, and for being coupled to and igniting the explosive charge; and a detonator, each of said support parts having two mounting holes, the distance between their centers being smaller than their maximum diameter perpendicular to the axis of the explosive charge. spaced apart in the longitudinal direction,
the body of the explosive charge is engaged in the mounting hole such that the two explosive charges are secured to the support portion with their axes facing in opposite directions in the radial direction of the longitudinal axis; A mine wall drilling device characterized in that it has a rear portion of reduced diameter. 2. The carrier constituting said support part consists of a metal tube, said tube having a continuous part, said continuous part having said opposite sides in the radial direction of different predetermined longitudinal axes to form said flat facing part. 2. The mine wall drilling device according to claim 1, wherein the ends are crushed together. 3. Each two consecutive parts of said supporter part shall be 90
Claims 1 or 2 are oriented in mutually perpendicular radial directions such that the explosive charge is oriented along the radial directions of four longitudinal axes forming an angle of 1.5 degrees. The described mine wall drilling device. 4. The body of each explosive charge is provided with a metal body member having sufficient strength for attachment, and a cover member made of a brittle material that shatters into small pieces after the explosive charge explodes. A mine wall drilling device according to any one of claims 1 to 3. 5. The mine wall drilling device according to claim 4, wherein the cover member of the body of the explosive charge body is made of ceramic. 6. Said metal body part consists of extruded steel, said extruded steel being such that the main parts of said body part are released by the explosion effect, but their rear parts remain attached to said support part after the explosion. 6. The mine wall drilling device according to claim 4, wherein the rupture resistance of the explosive packing in the axial direction is greater than that in the direction perpendicular to the axis. 7. The wellbore drilling device has a removable spacer that can be inserted between the explosive charge and the carrier, the carrier having a large diameter with a narrow gap between the front part of the explosive charge and the well casing. The mine wall drilling device according to any one of claims 1 to 6, characterized in that the device is for digging a hole provided with a well casing. 8. Claim 7, characterized in that the wellbore drilling device has different types of removable spacers of different preset lengths for drilling holes with well casings of different diameters. The mine wall drilling device described in Section 1. 9. The rear part of the explosive charge has a slot for passing the detonating cord, and each of the spacers has an annular part adapted to surround the rear part of the body of the charge, and The rear part of the filler is positioned within the spacer in order to reduce the amount of fluid in the spacer while ensuring proper adhesion of the cord to the filler body. 9. A mine wall drilling device as claimed in claim 7 or 8, adapted to engage the cord passage slot when the cord is inserted. 10. The mine wall drilling device according to claim 9, wherein the annular portion of each spacer has a reinforced thickness. 11 The detonator has an electrically actuated fuse for igniting two detonating cords, the detonating cords having a series of first explosive charges consisting of an explosive charge in each section and a series of explosive charges in each section. The mine wall drilling device according to any one of claims 1 to 10, characterized in that the device is connected to a series of second explosive packing bodies each consisting of another explosive packing body. 12. The mine wall drilling device according to claim 11, characterized in that the mine wall drilling device includes an explosive relay ignited by a fuze to simultaneously ignite two detonation cords. . 13. The mine wall drilling device has several explosive relays spaced longitudinally along the carrier, each relay for maintaining simultaneous ignition of two detonating cords. 13. The mine wall drilling device according to claim 12, wherein the shaft is connected to two detonation cords. 14 Each explosive charge body has a detonating cord passageway in which a detonating cord for igniting it after it has been attached to the support part is disposed along the side of the carrier oriented towards its front. The first claim characterized in that
The mine wall drilling device according to any one of Items 1 to 13. 15. Any one of claims 1 to 14, wherein each mounting hole has at least one flat portion to prevent rotation of an explosive charge engaged therein. The mine wall drilling device according to item 1.