A perforator for fracturing completion

Abstract

The present invention relates to a perforator for fracturing completion, belonging to the technical field of perforating operations. The present invention comprises an outer sleeve, a detonating cord and an ammunition rack, the ammunition rack comprises a plurality of frames, the frames are provided with bullet holes, perforating bullets are installed in the bullet holes, any two adjacent frames are provided with a connector and a plug block at one end close to each other, the connector is provided with a plug hole, the plug block and the plug hole can be adapted and plugged, the connector is provided with a slider, the outer wall of the plug block is provided with an annular groove, the bottom surface of the annular groove is provided with a first positioning groove and a second positioning groove arranged at intervals, the slider is inserted in the second positioning groove, the frame is provided with a detonating cord pressing mechanism, the detonating cord pressing mechanism comprises a bracket, and the bracket is spirally connected with a support sleeve for the detonating cord to pass through. The frames in the present invention are easier to assemble, the detonating cord in the present invention will not bend at the end of the support sleeve, and the detonating cord can be more firmly pressed on the perforating bullet.

Description

Technical Field

[0001] The invention relates to the technical field of perforating operations, and in particular to a perforator for fracturing well completion. Background Art

[0002] Fracturing completion is a key technology used in the oil and gas industry for the development of unconventional oil and gas reservoirs, especially for low permeability oil and gas reservoirs such as shale gas and tight oil. Fracturing completion creates holes in the wellbore wall and casing and injects high-pressure liquid to create cracks, so that oil and gas can flow more easily into the wellbore. During the fracturing completion operation, perforators are needed to form holes in the casing and wellbore wall in the oil well so that subsequent fracturing fluid can enter the formation.

[0003] The perforators in the prior art generally include perforating bullets and ammunition racks for placing the perforating bullets, such as a perforator disclosed in the patent with the authorization announcement number CN220539606U, which includes a perforator body with blind holes on the surface, a detonator arranged on the perforator body, and perforating bullets arranged in the blind holes of the perforator body. In the perforator, the blind holes on the perforator body for installing the perforating bullets are fixedly distributed around the perforator body. When installing the perforating bullets, the perforator body needs to be rotated continuously, and the installation efficiency of the perforating bullets is low.

[0004] In order to solve this problem, there is a perforator in the prior art with an adjustable position of the perforating bullet mounting hole, such as a perforator disclosed in the patent with authorization announcement number CN117868756B, which comprises a casing, a detonating cord and two positioning plates, an ammunition rack is provided between the two positioning plates, the ammunition rack comprises at least two frame assemblies connected in sequence, each frame assembly comprises a plurality of coaxially arranged frames, each frame is provided with a shot hole for loading the perforating bullet, a first protrusion is provided between two adjacent frames, the first protrusion is fixedly mounted on the end of one of the frames, the other frame is provided with a first plug hole facing the end of the first protrusion, the first protrusion is movably inserted in the first plug hole, a first spiral groove is provided on one of the outer circumference of the first protrusion and the inner circumference of the first plug hole, and a first sliding member is provided on the other, and the first sliding member is slidably fitted in the first spiral groove. In the device, the first sliding member cooperates with the first spiral groove so that when the two positioning plates are driven away from each other, each frame can be rotated until the bullet holes face the same direction, and then the perforating bullets are loaded, which can improve the loading efficiency.

[0005] Although the device can improve the efficiency of loading, in the process of assembling each frame, since the first sliding member protrudes from the inner wall of the first insertion hole, there is a certain distance between the first spiral groove and the end face of the first protrusion. During assembly, it is necessary to apply a large force to the two frames to make the two frames close to each other so that the first sliding member can pass through the outer wall of the first protrusion and be pressed into the first spiral groove. During assembly, it is necessary to knock the frame with the help of other workpieces, or heat one end where the first sliding member is located to increase the size of the inner hole at the end where the first sliding member is located before assembly, which is time-consuming and laborious. In addition, in the device, when the frames rotate relative to each other, the detonating cord will be torsion, causing the detonating cord to bend at the end of the positioning member, resulting in reduced conductivity and reliability of the detonating cord. Summary of the invention

[0006] The invention provides a perforator for fracturing completion, so as to solve the technical problems that the perforator in the prior art is time-consuming and labor-intensive to assemble, and the detonating cord is easily bent during assembly, resulting in reduced conductivity and reliability of the detonating cord.

[0007] In order to solve the above problems, the present invention provides a perforator for fracturing completion, which adopts the following technical solutions:

[0008] A perforator for fracturing completion, comprising an outer sleeve, a detonating cord and an ammunition rack, wherein the ammunition rack comprises a plurality of frames coaxially connected in sequence from top to bottom, wherein bullet holes are arranged on the frames, and there is a set angle between the hole axes of the bullet holes on any two adjacent frames, wherein perforating bullets are installed in the bullet holes, the detonating cord is used to cooperate with the perforating bullets installed in the ammunition rack, and the outer sleeve is sleeved on the outside of the ammunition rack;

[0009] A connector and an insert block are respectively provided at one end of any two adjacent frames close to each other, and a plug hole is provided on the connector, and the plug block and the plug hole can be adapted and plugged; a slider that can slide in the radial direction is provided on the connector, and an elastic member is connected between one end of the slider and the connector, and the other end extends into the plug hole; the end of the insert block is tapered, and an annular groove is provided on the outer wall of the insert block, and a first positioning groove and a second positioning groove arranged at intervals are provided on the groove bottom surface of the annular groove, and the angle between the first positioning groove and the second positioning groove is equal to the angle between the axis of the bullet hole on the corresponding two adjacent frames, and the groove wall surface of the first positioning groove close to the second positioning groove is inclined from the inside to the outside toward the second positioning groove, and the slider is inserted in the second positioning groove;

[0010] A detonating cord pressing mechanism is provided on the frame, and the detonating cord pressing mechanism includes a bracket slidably assembled on the frame along the circumference of the frame, and the bracket can be fixed on the frame when it moves to the entrance side facing the bullet hole. A supporting sleeve for the detonating cord to pass through is spirally connected on the bracket, and a through hole for exposing the detonating cord is provided on the side of the supporting sleeve facing the frame, and the supporting sleeve can drive the detonating cord to be pressed on the perforating bullet when it rotates.

[0011] By adopting the above technical solution, when assembling each frame, first insert the plug into the insertion hole, slide the slider through the tapered section and insert it into the annular groove, and then enter the first positioning groove, so that each frame is connected together, and the preliminary assembly of each frame is realized, and the assembly efficiency is higher. At this time, each shot hole in each frame faces the same direction, and the perforating bullet is filled in each shot hole. When filling, there is no need to adjust the direction of the ammunition rack, and the filling efficiency is higher. Before filling the perforating bullet, the bracket can be moved to the side of the shot hole to avoid affecting the installation of the perforating bullet.

[0012] When all the perforating bullets on the ammunition rack are loaded, each bracket is moved to face the bullet holes and fixed in this position, and the detonating cord is passed through each supporting sleeve in turn. Then, the topmost rack and the bottommost rack are rotated relative to each other. On the side where any two adjacent racks are close to each other, the slider slides into the second positioning groove along the inclined groove wall surface in the first positioning groove, so that the ammunition rack is adjusted to a state where the bullet holes on any two adjacent racks are facing different directions.

[0013] When the frame rotates, it will drag the detonating cord to twist, and the detonating cord will drive the supporting sleeve to rotate. When the supporting sleeve rotates, it will drive the detonating cord toward the frame, so that the detonating cord is pressed against the perforating bullet. Compared with the method of fixing the detonating cord to the perforating bullet by a buckle in the prior art, the detonating cord is fixed more firmly, and the supporting sleeve rotates synchronously with the detonating cord, and the detonating cord will not bend at the end of the supporting sleeve.

[0014] Furthermore, the connecting body includes a connecting sleeve and a connecting ring mounted on the outside of the connecting sleeve, the inner cavity of the connecting sleeve forms the insertion hole, the inner wall of the connecting ring is provided with a connecting groove running through from top to bottom, the connecting sleeve is provided with a radially extending mounting through hole, the connecting groove is correspondingly located on the outside of the mounting through hole, the slider is slidably inserted in the mounting through hole, and the elastic member is connected between the slider and the bottom surface of the connecting groove.

[0015] By adopting the above technical solution, when assembling the slider and the elastic part, the elastic part can be first connected to the slider, and then the elastic part and the slider are inserted into the mounting through hole, and then the elastic part and the connecting ring are connected through the connecting groove on the connecting ring, so as to facilitate the assembly of the slider to the connector.

[0016] Furthermore, the groove wall surface of the second positioning groove facing the first positioning groove is inclined from the inside to the outside toward the first positioning groove, and a third positioning groove is provided on the plug block. The third positioning groove is located on the side of the tapered end of the second positioning groove facing away from the plug block, and the third positioning groove and the second positioning groove are spaced apart along the axial direction of the frame body. The groove wall surface of the second positioning groove facing the third positioning groove is inclined from the inside to the outside toward the third positioning groove, and a guide groove connecting the second positioning groove and the third positioning groove is also provided between the second positioning groove and the third positioning groove; a pull rod is connected to the side of the slider close to the connecting ring, and an end of the pull rod facing away from the slider passes through the connecting ring and extends to the outside of the connecting ring.

[0017] With the above technical solution, the groove wall surface in the second positioning groove facing the first positioning groove is inclined from the inside to the outside toward the first positioning groove, so that the slider can be reversed from the second positioning groove to enter the first positioning groove. When the frame body is rotated in reverse, the frame body can be restored to a state where the bullet holes on each frame body face the same direction, which is convenient for the ammunition rack to be adjusted again to a state where the bullet holes face the same direction when the ammunition rack is reused, so as to facilitate the rapid installation of the perforating bullet. Since the second positioning groove is provided with an inclined surface for the slider to slide into the first positioning groove, in order to make the connection between the frames more stable, a third positioning groove is added. After the slider is inserted into the second positioning groove, the uppermost frame body and the lowermost frame body are brought close to each other, so that the slider enters the third positioning groove through the guide groove, and the slider is prevented from being pushed by the inclined surface and causing relative rotation between the frames. By setting a pull rod, pulling the pull rod outward can drive the slider to disengage from the third positioning groove, so that the slider can enter the second positioning groove from the third positioning groove, so that the frames can be reversed to reset each frame.

[0018] Furthermore, a spiral sleeve is provided on the bracket, and a moving rod is vertically connected to the side of the support sleeve facing away from the frame body. The moving rod extends radially along the frame body, and the moving rod cooperates with the spiral sleeve in spiral transmission. A torsion spring is connected between the moving rod and the spiral sleeve, and the torsion spring keeps the axis of the support sleeve in a state parallel to the axis of the frame body.

[0019] By adopting the above technical solution, the torsion spring keeps the support sleeve in a state where the axis is parallel to the axis of the frame, which makes it easy to install the detonating cord before rotating the frame.

[0020] Furthermore, a support plate is provided at each of the upper and lower ends of the frame, and the support plate is perpendicular to the axis of the frame. The two support plates are provided with arc-shaped slide grooves corresponding to each other and coaxial with the frame on one side close to each other. A positioning hole is provided on the bottom surface of the groove at one end of the arc-shaped slide groove, and the positioning hole is directly opposite to the hole axis of the bullet hole up and down. The other end of the arc-shaped slide groove extends to the side of the bullet hole. A sliding rod is connected to each of the two ends of the bracket, and the two sliding rods are respectively inserted into the positioning holes on the two support plates. The bracket is elastic so that the two sliding rods can approach each other when squeezed, so that they can be detached from the positioning hole and inserted into the arc-shaped slide groove.

[0021] By adopting the above technical solution, the bracket is elastic, and when the two slide rods are located in the arc-shaped slide groove, the slide rods can be pressed against the bottom surface of the arc-shaped slide groove, so that the bracket can slide along the arc-shaped slide groove only when it is pushed hard, thereby preventing the bracket from shaking on the bracket before the slide rods are inserted into the positioning holes. When the bracket slides to face the bullet hole, the two slide rods slide into the positioning holes respectively, so that the bracket can be fixed between the two positioning holes. When the perforator needs to be reused after being used once, the two slide rods can be pushed closer to each other to disengage the slide rods from the positioning holes and insert them into the arc-shaped slide groove, so that the position of the bracket becomes adjustable again without affecting the installation of the perforating bullet.

[0022] Furthermore, a positioning groove is provided on the outer wall of the perforating bullet, and the positioning groove extends along the axial direction of the perforating bullet. A positioning plate is provided in the bullet hole. When the perforating bullet is inserted into the bullet hole, the positioning plate is correspondingly inserted in the positioning groove. The detonating end of the perforating bullet is provided with an arc-shaped groove for the detonating cord to abut against. When the perforating bullet is inserted into the bullet hole, a set angle is formed between the extension direction of the arc-shaped groove and the axial direction of the frame.

[0023] With the above technical solution, the perforating bullet is provided with a positioning groove extending along the axis direction of the perforating bullet, so that the perforating bullet will not rotate after being loaded into the bullet hole, and the position of the perforating bullet is fixed more firmly. The detonating end of the bullet hole is provided with an arc groove, and the detonating cord is pressed into the arc groove by the supporting sleeve after rotating, so that the position of the detonating cord is fixed more firmly.

[0024] Furthermore, the outer edge of the support plate protrudes from the bracket.

[0025] By adopting the above technical solution, when the ammunition rack is installed in the sleeve, the outer edge of the support plate contacts the inner wall of the outer sleeve, thereby avoiding collision and friction between the rack body, perforating bullets and other structures and the inner wall of the outer sleeve.

[0026] Furthermore, the support plate is provided with an arc-shaped through hole for the detonating cord to pass through, and the arc-shaped through hole is coaxial with the frame.

[0027] By adopting the above technical solution, it is possible to avoid the detonating cord from bending due to the need for the detonating cord to pass over the support plate from the edge of the support plate when the detonating cord is inserted.

[0028] Furthermore, a straight edge is provided at the edge of the support plate.

[0029] By adopting the above technical solution, the ammunition rack can be prevented from rolling.

[0030] The beneficial effect of a perforator for fracturing completion provided by the present invention is that the present invention makes it easier to assemble the frames by arranging a slider, a first positioning groove and a second positioning groove on the frame, and the assembly efficiency is higher. At the same time, the present invention supports the detonating cord through the support sleeve, and when the frame rotates to drag the detonating cord to twist, the detonating cord will rotate synchronously with the support sleeve, and no bending will occur between the detonating cord and the end of the support sleeve, thereby avoiding affecting the stability of the detonating cord. When the support sleeve rotates, the detonating cord can also be pressed against the perforating bullet, and the detonating cord is fixed more securely. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0032] Figure 1 A schematic diagram of the structure of a perforator for fracturing completion provided by the present invention Figure 1 ;

[0033] Figure 2 A schematic diagram of the structure of a perforator for fracturing completion provided by the present invention Figure 2 ;

[0034] Figure 3 A schematic diagram of the structure of a perforator for fracturing completion provided by the present invention Figure 3 ;

[0035] Figure 4 A schematic diagram of the structure of a frame in a perforator for fracturing completion provided by the present invention Figure 1 ;

[0036] Figure 5 A schematic diagram of the structure of a frame in a perforator for fracturing completion provided by the present invention Figure 2 ;

[0037] Figure 6 A schematic diagram of the structure of a frame in a perforator for fracturing completion provided by the present invention Figure 3 ;

[0038] Figure 7 A schematic diagram of the structure of a frame in a perforator for fracturing completion provided by the present invention Figure 4 ;

[0039] Figure 8 A schematic diagram of the structure of a perforating bullet in a perforator for fracturing completion provided by the present invention;

[0040] Fig. 9A cross-sectional view of a frame in a perforator for fracturing completion provided by the present invention;

[0041] Fig.10 A schematic structural diagram of a support sleeve in a perforator for fracturing completion provided by the present invention.

[0042] Description of reference numerals:

[0043] 1. Outer sleeve; 101. Thickening groove; 2. Frame; 201. Bullet hole; 202. Insertion port; 203. Ejection port; 204. Stop edge; 3. Support plate; 301. Arc through hole; 302. Arc chute; 303. Positioning hole; 4. Perforating bullet; 401. Positioning chute; 402. Arc groove; 5. Positioning plate; 6. Connecting sleeve; 601. Insertion hole; 602. Mounting through hole; 7. Connecting ring; 701, connecting groove; 8, plug-in block; 801, cylindrical section; 802, conical section; 803, annular groove; 804, first positioning groove; 805, second positioning groove; 806, third positioning groove; 807, guide groove; 9, bracket; 10, slide rod; 11, spiral sleeve; 12, support sleeve; 121, through hole; 13, slider; 14, pull rod; 15, elastic member; 16, detonating cord; 17, moving rod. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] The following is an embodiment of a perforator for fracturing completion provided by the present invention:

[0046] like Figure 1 , Figure 2 , Figure 3 As shown, a perforator for fracturing completion includes an outer sleeve 1, an ammunition rack, a perforating bullet 4 and a detonating cord 16.

[0047] like Figure 1 As shown, the outer sleeve 1 is a cylindrical sleeve structure, and the outer side wall of the outer sleeve 1 is provided with spirally spaced thickness reducing grooves 101 .

[0048] like Figure 2 As shown, the ammunition rack includes a rack body 2, a support plate 3 and a detonating cord pressing mechanism.

[0049] There are multiple frames 2, and the multiple frames 2 are arranged in sequence from top to bottom. Figure 4 , Figure 5As shown, the frame 2 is a cylindrical sleeve structure, and the top and bottom ends of the frame 2 are closed. A bullet hole 201 is provided on the frame 2, and the hole axis of the bullet hole 201 is perpendicular to the axis of the frame 2. The bullet hole 201 penetrates the frame 2, and the bullet hole 201 forms an insertion port 202 and an ejection port 203 on the side wall of the frame 2. The insertion port 202 is used for inserting the perforating bullet 4, and the ejection port 203 is used for ejecting the perforating bullet 4 after being detonated. The ejection port 203 has a stopping edge 204 for stopping the perforating bullet 4, so that the perforating bullet 4 will not pass through the ejection port 203 after being inserted into the bullet hole 201. A positioning plate 5 is provided on the inner side wall of the frame 2, and the positioning plate 5 is arranged horizontally.

[0050] like Figure 5 , Figure 6 As shown, a connecting piece is provided on the top of the frame 2 and an insert block 8 is provided on the bottom.

[0051] like Figure 4 , Figure 5 , Figure 6 As shown, the connecting piece includes a connecting sleeve 6 and a connecting ring 7.

[0052] The connecting sleeve 6 is coaxially connected to the frame 2 on the top surface of the frame 2, and the inner cavity of the connecting sleeve 6 forms an insertion hole 601. The connecting sleeve 6 is provided with two mounting through holes 602 extending along the radial direction of the connecting sleeve 6, and the two mounting through holes 602 are arranged oppositely, and the extending direction of the mounting through holes 602 is perpendicular to the hole axis direction of the projectile hole 201.

[0053] The inner wall of the connecting ring 7 is provided with two connecting grooves 701 penetrating vertically, and the two connecting grooves 701 are arranged opposite to each other. The connecting ring 7 is sleeved on the outer side of the connecting sleeve 6, and the connecting grooves 701 are correspondingly located on the outer side of the mounting through hole 602.

[0054] like Figure 7 , Fig. 9 As shown, a slider 13 is slidably inserted into the installation through hole 602, and an elastic member 15 is connected between the slider 13 and the bottom surface of the connecting groove 701. The elastic member 15 is a tension spring, and the end of the slider 13 facing away from the connecting ring 7 extends into the insertion hole 601. A pull rod 14 is slidably inserted into the connecting ring 7 at a position corresponding to the connecting groove 701. The pull rod 14 passes through the connecting ring 7 and extends into the installation through hole 602 and is connected to the slider 13.

[0055] like Figure 5 , Figure 6 As shown, the insert block 8 includes a cylindrical section 801 and a conical section 802 which are sequentially connected from top to bottom.

[0056] The cylindrical section 801 is coaxial with the frame 2, and an annular groove 803 is provided on one side of the cylindrical section 801 close to the conical section 802, which is arranged around the cylindrical section 801. Two first positioning grooves 804 are arranged opposite to each other on the bottom surface of the annular groove 803, and the center line of the two first positioning grooves 804 is perpendicular to the hole axis of the bullet hole 201. Two second positioning grooves 805 are also arranged opposite to each other on the bottom surface of the annular groove 803, and the center line of the two second positioning grooves 805 is perpendicular to the center line of the two first positioning grooves 804, so that a 90-degree angle is formed between the first positioning groove 804 and the second positioning groove 805.

[0057] In a top view, the groove wall surface of the first positioning groove 804 close to the second positioning groove 805 located on its rear side in a clockwise direction is inclined from the inside to the outside toward the second positioning groove 805, and this inclined surface is called the first push inclined surface; the groove wall surface of the second positioning groove 805 close to the first positioning groove 804 located on its rear side in a counterclockwise direction is inclined from the inside to the outside toward the first positioning groove 804, and this inclined surface is called the second push inclined surface.

[0058] like Figure 6 As shown, two third positioning grooves 806 arranged opposite to each other are further provided on the cylindrical section 801. The two third positioning grooves 806 are respectively located directly above the two second positioning grooves 805, and a gap is provided between the third positioning groove 806 and the corresponding second positioning groove 805. The groove wall surface of the second positioning groove 805 facing the corresponding third positioning groove 806 is inclined from inside to outside toward the corresponding third positioning groove 806, and the inclined surface is called a third push inclined surface. A guide groove 807 for connecting the second positioning groove 805 and the third positioning groove 806 is further provided between the second positioning groove 805 and the third positioning groove 806.

[0059] The top of the uppermost frame 2 is not provided with a connector, so that the uppermost frame 2 is connected to a connector and other structures, and the bottom of the lowermost frame 2 is not provided with an insert 8, so that the lowermost frame 2 is connected to a detonator, a guide and positioning device and other structures. The connection between the upper and lower ends of the ammunition rack and the connector, the detonator, the guide and positioning device and other structures is a prior art and will not be described in detail here.

[0060] When assembling the frame 2, the insertion openings 202 of the bullet holes 201 in the upper and lower frames 2 are kept in the same direction to insert the plug block 8 into the insertion hole 601, and the two sliders 13 are pushed into the annular groove 803 by the tapered section 802 and then inserted into the first positioning groove 804. In this way, the preliminary connection between the frames 2 is completed. The insertion openings 202 of the bullet holes 201 on each frame 2 are in the same direction. At this time, the perforating bullet 4 is loaded, and the loading efficiency is higher. After the perforating bullet 4 is loaded, the uppermost frame 2 and the lowermost frame 2 can be rotated in opposite directions, so that each slider 13 can slide into the second positioning groove 805 after being pushed by the first pushing slope. At this time, the perforations on any two adjacent frames 2 are facing different directions. Then, the uppermost frame 2 and the lowermost frame 2 are brought closer to each other, so that the slider 13 slides into the third positioning groove 806 along the third pushing slope. Since there is no inclined surface in the third positioning groove 806, the slider 13 is not easy to slip out of the third positioning groove 806. At this time, relative rotation is not easy to occur between the frames 2, and the frames 2 are relatively fixed to facilitate subsequent use.

[0061] like Figure 4 , Figure 5 As shown, there are multiple support plates 3, and two support plates 3 are symmetrically arranged at the upper and lower ends of each frame 2, and the support plates 3 are perpendicular to the axis of the frame 2. The two support plates 3 on the frame 2 are provided with arc-shaped slide grooves 302 that correspond to each other and are coaxial with the frame 2 on one side close to each other, and a positioning hole 303 is provided on the groove bottom surface of one end of the arc-shaped slide groove 302, and the positioning hole 303 is vertically opposite to the hole axis of the projectile hole 201 and is located on one side of the insertion port 202 of the projectile hole 201, and the other end of the arc-shaped slide groove 302 extends to the side of the projectile hole 201.

[0062] The support plate 3 is also provided with an arc-shaped through hole 301 for passing the detonating cord 16, and the arc-shaped through hole 301 is coaxial with the frame 2. The edge of the support plate 3 is provided with three straight edges to prevent the frame 2 from rolling when placed on a plane structure.

[0063] like Figure 7 As shown, the detonating cord pressing mechanism includes a bracket 9, a slide rod 10 and a supporting sleeve 12.

[0064] like Figure 7 As shown, the bracket 9 includes a vertical plate segment and two horizontal plate segments connected to the upper and lower ends of the vertical plate segment. The horizontal plate segment and the vertical plate segment are integrally formed. The vertical plate segment and the horizontal plate segment are both thin metal plates with elasticity at the bends. A gap is provided between the vertical plate segment and the outer wall of the frame body 2. A spiral sleeve 11 is connected to the middle of the vertical plate segment. The spiral sleeve 11 is located on the side of the vertical plate segment close to the frame body 2.

[0065] There are two slide bars 10, which are respectively vertically connected to two horizontal plate sections. The two slide bars 10 are respectively inserted into the arc-shaped slide grooves 302 in the two support plates 3 on the frame 2. After the perforating bullet 4 is loaded into the bullet hole 201, the slide bar 10 can slide along the arc-shaped slide groove 302 into the positioning hole 303 at the end of the arc-shaped slide groove 302, so that the bracket 9 is fixed on the frame 2, and the spiral sleeve 11 on the bracket 9 is opposite to the bullet hole 201.

[0066] The support sleeve 12 is located in the interval between the vertical plate section and the frame 2, and is used for the detonating cord 16 to pass through. Fig.10 As shown, a through hole 121 for exposing the detonating cord 16 is provided on the side of the support sleeve 12 facing the frame body 2, and a hole length dimension of the through hole 121 is larger than an outer diameter dimension of the detonating end face of the perforating bullet 4. A moving rod 17 is vertically connected to the side of the support sleeve 12 facing away from the frame body 2, and the moving rod 17 extends along the radial direction of the frame body 2. The moving rod 17 is inserted into the spiral sleeve 11 and cooperates with the spiral sleeve 11 in a spiral transmission. A torsion spring is connected between the moving rod 17 and the spiral sleeve 11. When the support sleeve 12 is not subjected to external force, the torsion spring keeps its axis parallel to the axis of the frame body 2.

[0067] like Figure 8 As shown, a positioning slot 401 extending along the axis direction of the perforating bullet 4 is provided on the outer wall of the perforating bullet 4, and when the perforating bullet 4 is inserted into the bullet hole 201, the positioning plate 5 in the frame 2 is inserted into the positioning slot 401. An arc groove 402 is also provided at the detonation end of the perforating bullet 4, and the extension direction of the arc groove 402 forms an acute angle with the axis of the frame 2.

[0068] like Figure 3 As shown, one end of the detonating cord 16 is connected to the detonator, and the other end passes through the arc-shaped through hole 301 on each support plate 3 and the support sleeve 12 on the frame 2 in sequence. The detonating cord 16 is dragged and twisted when the frames 2 rotate relative to each other. When the detonating cord 16 rotates, it drives the support sleeve 12 to rotate. When the support sleeve 12 rotates, it moves toward the perforating bullet 4 on the frame 2, so that the detonating cord 16 can be pressed tightly in the arc-shaped groove 402 in the perforating bullet 4.

[0069] When the present invention is in use, the slider 13 in one of the two adjacent frames 2 is inserted into the first positioning groove 804 in the other frame 2 to complete the preliminary assembly. At this time, the insertion openings 202 of the bullet holes 201 in each frame 2 are all facing the same direction, and the perforating bullets 4 are loaded into each bullet hole 201. When inserting the perforating bullets 4, ensure that each positioning plate 5 is inserted into the positioning slot 401, so that the perforating bullets 4 cannot rotate after being loaded into the bullet holes 201.

[0070] Then, each bracket 9 is pushed to slide along the arc-shaped slide groove 302 toward the positioning hole 303, so that the slide rod 10 is inserted into the positioning hole 303, and the bracket 9 is fixed on the outer side of the insertion port 202 of the corresponding bullet hole 201. At this time, the state of the entire ammunition rack is as follows: Figure 2 As shown, the detonating cord 16 is then passed through each arc-shaped through hole 301 and each supporting sleeve 12, and then the topmost frame 2 and the bottommost frame 2 are held to rotate the two frames 2 in opposite directions. In a top-down state, each frame 2 located on the upper side rotates counterclockwise relative to the frame 2 located on the lower side, so that the slider 13 slides from the first push inclined surface into the second positioning groove 805. At this time, the perforating bullets 4 on any two adjacent frames 2 are facing different directions, and the shooting angle between the two adjacent perforating bullets 4 is 90 degrees.

[0071] During the relative rotation between the frames 2, the detonating cord 16 is driven by the frames 2 to twist, and the detonating cord 16 twists and drives the support sleeve 12 to rotate, and the support sleeve 12 rotates and moves toward the perforating bullet 4. After the support sleeve 12 rotates to a set angle, the detonating cord 16 is pressed tightly into the arc groove 402 on the perforating bullet 4. Then, the uppermost frame 2 and the lowermost frame 2 are pushed closer to each other, so that the slider 13 slides into the third positioning groove 806 along the third push inclined surface and the guide groove 807, and the final clamping and fixing between the frames 2 is achieved.

[0072] After the perforator performs a perforating operation, the pull rod 14 can be pulled outward to make the slider 13 withdraw from the third positioning groove 806, and then the two adjacent frames 2 are pulled away from each other to make the slider 13 slide into the second positioning groove 805. Then, the uppermost and lowermost frames 2 are rotated relative to each other in the direction opposite to the rotation direction during installation, so that the slider 13 slides into the first positioning groove 804 along the second push inclined surface, and then the bracket 9 is moved to the side of the bullet hole 201. At this time, a new perforating bullet 4 can be reinstalled to reuse the perforator.

[0073] The various frames 2 in the perforator for fracturing completion provided by the present invention are more convenient and quick to assemble, and the assembly efficiency is higher. The support sleeve 12 rotates synchronously with the detonating cord 16, and the detonating cord 16 will not bend at the end of the support sleeve 12. The conductivity and stability of the detonating cord 16 will not be affected by the bending. When the support sleeve 12 rotates, the detonating cord 16 can be pressed against the perforating bullet 4, and the connection between the detonating cord 16 and the perforating bullet 4 is more firm.

[0074] In this embodiment, a pull rod 14 is connected to the slider 13, and the slider 13 can be pulled out of the third positioning groove 806 by pulling the pull rod 14 to readjust the relative positions of the frames 2. In other embodiments, there is no pull rod 14 on the slider 13. At this time, the slider 13 is inserted into the third positioning groove 806 and cannot be detached, and the relative positions of the frames 2 cannot be readjusted.

[0075] In this embodiment, the first positioning groove 804 and the second positioning groove 805 form an angle of 90 degrees, and the hole axes of the bullet holes 201 in two adjacent frames 2 form an angle of 90 degrees. In other embodiments, the first positioning groove 804 and the second positioning groove 805 form an angle of 60 degrees, and the hole axes of the bullet holes 201 in two adjacent frames 2 form an angle of 60 degrees.

Claims

1. A perforator for fracturing completion, comprising an outer sleeve, a detonating cord and an ammunition rack, wherein the ammunition rack comprises a plurality of frames coaxially connected in sequence from top to bottom, wherein the frames are provided with bullet holes, wherein the hole axes of the bullet holes on any two adjacent frames have a set angle, wherein perforating bullets are installed in the bullet holes, wherein the detonating cord is used to cooperate with the perforating bullets installed in the ammunition rack, and wherein the outer sleeve is sleeved on the outside of the ammunition rack; It is characterized in that A connector and an insert block are respectively provided at one end of any two adjacent frames close to each other, and a plug hole is provided on the connector, and the plug block and the plug hole can be adapted and plugged; a slider that can slide in the radial direction is provided on the connector, and an elastic member is connected between one end of the slider and the connector, and the other end extends into the plug hole; the end of the insert block is tapered, and an annular groove is provided on the outer wall of the insert block, and a first positioning groove and a second positioning groove arranged at intervals are provided on the groove bottom surface of the annular groove, and the angle between the first positioning groove and the second positioning groove is equal to the angle between the axis of the bullet hole on the corresponding two adjacent frames, and the groove wall surface of the first positioning groove close to the second positioning groove is inclined from the inside to the outside toward the second positioning groove, and the slider is inserted in the second positioning groove; The frame is provided with a detonating cord pressing mechanism, which includes a bracket slidably mounted on the frame along the circumference of the frame, and can be fixed on the frame when the bracket moves to the entrance side facing the bullet hole, and a support sleeve for the detonating cord to pass through is spirally connected on the bracket, and a through hole for exposing the detonating cord is provided on the side of the support sleeve facing the frame, and the support sleeve can drive the detonating cord to be pressed on the perforating bullet when it rotates; The connecting body comprises a connecting sleeve and a connecting ring sleeved on the outside of the connecting sleeve, the inner cavity of the connecting sleeve forms the insertion hole, the inner wall of the connecting ring is provided with a connecting groove penetrating up and down, the connecting sleeve is provided with a radially extending mounting through hole, the connecting groove is correspondingly located on the outside of the mounting through hole, the slider is slidably inserted in the mounting through hole, and the elastic member is connected between the slider and the groove bottom surface of the connecting groove; The groove wall surface of the second positioning groove facing the first positioning groove is inclined from the inside to the outside toward the first positioning groove, and a third positioning groove is provided on the plug block. The third positioning groove is located on the side of the tapered end of the second positioning groove facing away from the plug block, and the third positioning groove and the second positioning groove are spaced apart along the axial direction of the frame body. The groove wall surface of the second positioning groove facing the third positioning groove is inclined from the inside to the outside toward the third positioning groove, and a guide groove connecting the second positioning groove and the third positioning groove is also provided between the second positioning groove and the third positioning groove; a pull rod is connected to the side of the slider close to the connecting ring, and an end of the pull rod facing away from the slider passes through the connecting ring and extends to the outside of the connecting ring.

2. A perforator for fracturing completion according to claim 1, characterized in that: The bracket is provided with a spiral sleeve, and a moving rod is vertically connected to the side of the support sleeve facing away from the frame body. The moving rod extends radially along the frame body, and the moving rod cooperates with the spiral sleeve in spiral transmission. A torsion spring is connected between the moving rod and the spiral sleeve, and the torsion spring keeps the axis of the support sleeve parallel to the axis of the frame body.

3. A perforator for fracturing completion according to claim 1, characterized in that: A support plate is respectively provided at the upper and lower ends of the frame, and the support plate is perpendicular to the axis of the frame. The two support plates are provided with arc-shaped slide grooves corresponding to each other and coaxial with the frame on one side close to each other. A positioning hole is provided on the groove bottom surface of one end of the arc-shaped slide groove, and the positioning hole is directly opposite to the hole axis of the bullet hole up and down. The other end of the arc-shaped slide groove extends to the side of the bullet hole. A sliding rod is respectively connected to the two ends of the bracket, and the two sliding rods are respectively inserted into the positioning holes on the two support plates. The bracket is elastic so that the two sliding rods can approach each other when squeezed, so that they can be detached from the positioning hole and inserted into the arc-shaped slide groove.

4. A perforator for fracturing completion according to claim 3, characterized in that: A positioning groove is provided on the outer wall of the perforating bullet, and the positioning groove extends along the axial direction of the perforating bullet. A positioning plate is provided in the bullet hole. When the perforating bullet is inserted into the bullet hole, the positioning plate is correspondingly inserted into the positioning groove. An arc-shaped groove is provided at the detonating end of the perforating bullet for the detonating cord to abut against. When the perforating bullet is inserted into the bullet hole, a set angle is formed between the extension direction of the arc-shaped groove and the axial direction of the frame.

5. A perforator for fracturing completion according to claim 3, characterized in that: The outer edge of the support plate protrudes from the bracket.

6. A perforator for fracturing completion according to claim 3, characterized in that: The support plate is provided with an arc-shaped through hole for the detonating cord to pass through, and the arc-shaped through hole is coaxial with the frame body.

7. A perforator for fracturing completion according to claim 3, characterized in that: A straight edge is provided at the edge of the support plate.

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