Perforating gun structure for oilfield water injection reservoir transformation

Abstract

The perforating gun structure comprises a plurality of perforating sections which are sequentially connected in an end-to-end mode, the ends of every two adjacent perforating sections are movably connected through a universal joint connecting assembly, a plurality of sets of perforating channels which are distributed in an annular mode are formed in the circumferential side wall of each perforating section, and the perforating channels are communicated with the perforating sections. Each universal joint connecting assembly comprises a universal joint body, a limiting mechanism is arranged on one side of each universal joint body, each universal joint body is provided with a connecting mechanism, each limiting mechanism comprises an arc-shaped piece, an arc-shaped sliding groove is formed in the surface of one side of each arc-shaped piece in a penetrating mode, one end of each connecting mechanism is slidably connected into the corresponding arc-shaped sliding groove, and the other end of each connecting mechanism is slidably connected into the corresponding arc-shaped sliding groove. The perforating gun is designed to be of a modularized split type structure, multi-angle flexible adjustment between perforating sections is achieved through the universal joint connecting assembly, the perforating direction can be accurately adjusted according to the actual situation of the stratum, the accuracy and effectiveness of perforating operation are improved, and the adaptability to the complex stratum is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of perforating gun, specifically, relate to a kind of perforating gun structure for oilfield injection reservoir reconstruction. BACKGROUND

[0002] In the current oilfield injection reservoir reconstruction operation, the traditional perforating gun is mostly designed with integrated structure. This integrated structure makes the perforating gun have certain limitations when facing complex and varied formation conditions. Since the perforating angle cannot be changed, it is difficult to perform accurate perforation for different formation dip angles, rock distribution characteristics and the like. When encountering inclined formation or reservoir with special rock structure, the single perforation direction cannot comprehensively and efficiently reconstruct the reservoir, which easily leads to insufficient reconstruction in some areas, affecting water injection effect and oil recovery ratio.

[0003] How to invent a perforating gun structure for oilfield injection reservoir reconstruction to improve these problems has become a problem to be solved by the skilled in the art. INVENTION CONTENTS

[0004] To make up for the above shortcomings, the utility model provides a perforating gun structure for oilfield injection reservoir reconstruction, aiming at improving the problem that the integrated structure of the traditional perforating gun has certain limitations when facing complex and varied formation conditions.

[0005] The utility model is realized as follows: a perforating gun structure for oilfield injection reservoir reconstruction, comprising a plurality of perforating segments connected in sequence, two adjacent perforating segments are movably connected through a universal joint connecting assembly, a plurality of groups of annularly distributed perforating channels are formed in the side wall of each perforating segment, each universal joint connecting assembly comprises a universal joint body, the universal joint body comprises two oppositely arranged connecting parts arranged in an upper and lower manner, one end of each connecting part is rotatably connected to the end of the corresponding perforating segment, a cross connecting shaft is arranged between the opposite ends of the two connecting parts, each connecting part is rotatably connected to the two ends of the cross connecting shaft extending in a straight line, a limiting mechanism is arranged on one side of the two connecting parts, a connecting mechanism is arranged on each connecting part, the limiting mechanism comprises an arc-shaped piece, an arc-shaped sliding groove is formed in the surface of one side of the arc-shaped piece, one end of each connecting mechanism is slidably connected in the arc-shaped sliding groove, and a limiting piece is further arranged on the outer wall of one side of the arc-shaped piece and connected with the two connecting mechanisms.

[0006] In a preferred technical scheme of the utility model, a plurality of groups of perforating channels are evenly distributed along the extension direction of the perforating segment, each group of perforating channels has three perforating channels, and the three perforating channels are annularly and evenly distributed to communicate the inside and outside of the perforating segment.

[0007] In a preferred technical scheme of the utility model, the diameter of one end of each perforating channel towards the inside of perforating section is larger than the diameter of the other end.

[0008] In a preferred technical scheme of the utility model, a spiral flow guide groove is formed on the inner wall of the perimeter of each perforating channel.

[0009] In a preferred technical scheme of the utility model, a wiring hole is formed on the surface of the top end and the bottom end of each perforating section and is in communication with the inside thereof.

[0010] In a preferred technical scheme of the utility model, each connecting mechanism comprises a connecting ring, the connecting ring is fixedly sleeved on the outside of the corresponding connecting part, an arc-shaped extension part is integrally arranged on one side of the connecting ring, the arc-shaped extension parts on the two corresponding connecting mechanisms are oppositely arranged, the two arc-shaped extension parts are hollow and a connecting shaft is arranged between the inner walls of the opposite end portions, and the two connecting shafts are located in the arc-shaped sliding grooves.

[0011] In a preferred technical scheme of the utility model, the limiting part comprises a limiting part integrally arranged on the outer wall of the arc-shaped part away from the connecting part and having the same curvature as the arc-shaped part, two second limiting ear plates respectively arranged on the outer walls of the corresponding arc-shaped extension parts, a plurality of second limiting screw holes evenly distributed along the extending direction of the limiting part and formed on one side surface of the limiting part, a plug hole formed through each second limiting ear plate surface, and a second limiting bolt inserted in each plug hole.

[0012] In a preferred technical scheme of the utility model, the number of the second limiting ear plates, the second limiting bolts and the second limiting screw holes is two groups, the second limiting screw holes of the two groups are symmetrically formed on the two side surfaces of the limiting part, the second limiting ear plates of the two groups are oppositely arranged on the outer walls of the arc-shaped extension parts and located on the two sides of the hollow part, and the second limiting bolts of the two groups are respectively inserted in the plug holes formed on the surfaces of the corresponding side second limiting ear plates.

[0013] In a preferred technical scheme of the utility model, a first limiting ear plate is integrally arranged on one end of each arc-shaped extension part close to the corresponding connecting part, the extending direction of the first limiting ear plate is parallel to the axial direction of the perforating section and a plug hole is also formed through the surface of the first limiting ear plate, a first limiting bolt is inserted in each plug hole, a plurality of first limiting screw holes evenly distributed in a ring shape are formed on the outer walls of the two ends of the perforating section along the radial direction thereof, and one end of the first limiting bolt is threadedly connected in the corresponding first limiting screw hole.

[0014] The utility model discloses an advantageous effect is: the utility model discloses a kind of perforating gun structures for oilfield injection reservoir reconstruction, when using, by being designed as modular split structure of perforating gun, the multi-angle flexible adjustment between perforating section is realized using universal joint connecting assembly, can be accurately adjusted according to stratum actual situation Perforating direction, improve the accuracy and effectiveness of perforating operation, improve the adaptability to complex stratum. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced to the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, without creative labor, can also obtain other related drawings according to these drawings.

[0016] Figure 1 It is the whole structure schematic perspective drawing provided by the utility model embodiment;

[0017] Figure 2 It is the whole section structure schematic perspective drawing provided by the utility model embodiment;

[0018] Figure 3 It is the whole structure schematic perspective drawing provided by the utility model embodiment universal joint connecting assembly;

[0019] Figure 4 It is the whole explosion structure schematic perspective drawing provided by the utility model embodiment universal joint connecting assembly.

[0020] In the drawing: 100-perforating section;200-universal joint connecting assembly;110-perforating channel;111-helical flow guide groove;120-wiring hole;130-first limit screw hole;210-universal joint body;220-limit mechanism;230-connecting mechanism;211-connection part;212-cross connecting shaft;221-arc-shaped piece;222-arc-shaped sliding groove;223-limiting part;224-second limit screw hole;231-connecting ring;232-arc-shaped extension;233-connecting shaft;234-second limit ear plate;235-second limit bolt;236-first limit ear plate;237-first limit bolt. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment. Obviously, the described embodiment is part of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] Please refer to Figures 1 to 4 The utility model provides a kind of technical scheme: a kind of oilfield water injection reservoir reconstruction is used Perforating gun structure, including a plurality of sequentially head-to-tail connection's perforating section 100, between the end of adjacent two perforating section 100 is connected by universal joint connecting assembly 200 movably connected, a plurality of groups of annular distribution's perforating channel 110 are set on the circumference lateral wall of each perforating section 100, each universal joint connecting assembly 200 includes universal joint body 210, universal joint body 210 includes two and oppositely arranged connection portion 211 of upper and lower distribution, one end of each connection portion 211 is rotatably connected with the end of corresponding perforating section 100, cross connecting shaft 212 is arranged between the opposite end of two connection portion 211, each connection portion 211 is rotatably connected with the axis two ends of linear extension on cross connecting shaft 212, limit mechanism 220 is arranged on one side of two connection portion 211, connection mechanism 230 is arranged on each connection portion 211, limit mechanism 220 includes arc piece 221, arc-shaped sliding slot 222 is set on the surface of one side of arc piece 221, and one end of each connection mechanism 230 is slidably connected in arc-shaped sliding slot 222, and limit piece that cooperates with the connection of two connection mechanisms 230 is further arranged on the outer wall of one side of arc piece 221.

[0023] It should be noted that the internal structure and use principle of each perforating section 100 are consistent with the internal structure and principle of the existing perforating gun.

[0024] Please refer to Figure 2 A plurality of groups of perforating channel 110 are evenly distributed in the extension direction of perforating section 100, and the number of each group of perforating channel 110 is three. The three perforating channels 110 are annularly and evenly distributed to communicate the inside and outside of the perforating section 100.

[0025] Each column of perforating channels 110 is equally spaced, and is annularly distributed at 120° with the axis of the perforating section 100 as the center, to ensure uniform perforation coverage. This ensures that each direction of the reservoir can be effectively modified, promotes the uniform diffusion of water injection in the reservoir, improves the uniformity of reservoir permeability, and improves the efficiency of crude oil production.

[0026] Further, one end of each perforating channel 110 towards the inside of the perforating section 100 has a larger diameter than the other end.

[0027] The perforating channel 110 is in a whole conical structure, effectively improves the energy utilization rate of the perforating bullet, increases the perforating depth and aperture, better connects the reservoir and the wellbore, is favorable for the flow of crude oil and water injection, and improves the oilfield exploitation effect.

[0028] Further, the spiral flow guide groove 111 is arranged on the inner wall of each perforating channel 110.

[0029] The spiral flow guide groove 111 makes the jet flow rotate, has a shearing and impact double effect on the reservoir rock, has a better crushing effect, can reform the reservoir to a greater extent under the same perforating bullet energy, and improves the reservoir reform quality.

[0030] Further, the wiring hole 120 is arranged on the top end and the bottom end surface of each perforating segment 100 and is in communication with the inside.

[0031] The wiring hole 120 is arranged on the top end and the bottom end surface of the perforating segment 100 and is in communication with the inside, is used for inserting a signal line, connects the perforating segments 100 in series, realizes the transmission of the explosion signal, ensures that the perforating bullet energy in each perforating segment 100 is detonated in a predetermined order, avoids signal transmission failure, and ensures that the perforating operation is carried out smoothly.

[0032] Please refer to Figure 3 and Figure 4 Each connecting mechanism 230 comprises a connecting ring 231 fixedly sleeved outside the corresponding connecting part 211, the connecting ring 231 is integrally provided with an arc-shaped extension part 232 on one side, the two arc-shaped extension parts 232 are oppositely arranged on the two corresponding connecting mechanisms 230, the two arc-shaped extension parts 232 are hollow and are provided with a connecting shaft 233 between the inner walls of the opposite end portions, and the two connecting shafts 233 are located inside the arc-shaped sliding groove 222.

[0033] The connecting mechanism 230 fixes the connecting part 211 and the arc-shaped extension part 232 through the connecting ring 231, so that the connecting part 211 can drive the end portion of the arc-shaped extension part 232 to slide in the arc-shaped sliding groove 222 when rotating, realizes the angle adjusting function, and provides a connection basis for the limiting mechanism 220.

[0034] Further, the limiting part 223 is integrally arranged on the outer wall of the arc-shaped part 221 away from the connecting part 211 and has the same curvature as the arc-shaped part 221, the second limiting lug plate 234 is arranged on the outer wall of the corresponding arc-shaped extension part 232, the second limiting lug plate 234 is provided with a plurality of second limiting screw holes 224 arranged on one side of the limiting part 223 and uniformly distributed along the extension direction of the limiting part 223, the surface of each second limiting lug plate 234 is provided with an insertion hole, and the second limiting bolt 235 is inserted into each insertion hole.

[0035] The limiting part 223 is integrally formed or firmly connected with the arc-shaped part 221 to ensure the consistency of the arc. The second limiting lug plate 234 is installed at the corresponding position of the outer wall of the arc-shaped extension part 232, drilled and installed with the second limiting bolt 235. When the connecting part 211 is adjusted to the appropriate angle, the second limiting bolt 235 is inserted into the insertion hole of the second limiting lug plate 234 and screwed into the second limiting screw hole 224 for fixation. The angle of the connecting part 211 is effectively limited to ensure that the perforating gun can maintain a stable perforating angle in different operating environments, thereby improving the accuracy and reliability of the perforating operation.

[0036] Further, the second limiting lug plate 234, the second limiting bolt 235 and the second limiting screw hole 224 are both two groups. The two groups of second limiting screw holes 224 are symmetrically arranged on the two side surfaces of the limiting part 223. The two groups of second limiting lug plates 234 are oppositely arranged on the outer wall of the arc-shaped extension part 232 and located on the two sides of the hollow part. The two second limiting bolts 235 are respectively inserted into the insertion holes arranged on the surface of the corresponding second limiting lug plate 234.

[0037] The two groups of second limiting lug plates 234, the second limiting bolt 235 and the second limiting screw hole 224 are symmetrically arranged, which enhances the stability of the angle limiting of the connecting part 211 and prevents the connecting part 211 from being deviated or loosened under stress.

[0038] Further, the first limiting lug plate 236 is integrally arranged on one end of each arc-shaped extension part 232 close to the corresponding connecting part 211. The extending direction of the first limiting lug plate 236 is parallel to the axial direction of the perforating segment 100, and the surface of the first limiting lug plate 236 is also provided with an insertion hole. The first limiting bolt 237 is inserted into each insertion hole. The first limiting screw hole 130 is arranged on the outer wall of each perforating segment 100 in the radial direction, and the first limiting screw hole 130 is evenly distributed in a ring shape. One end of the first limiting bolt 237 is threadedly connected to the corresponding first limiting screw hole 130.

[0039] The first limiting lug plate 236 is arranged on one end of the arc-shaped extension part 232 close to the connecting part 211, and the extending direction of the first limiting lug plate 236 is parallel to the axial direction of the perforating segment 100. The first limiting screw hole 130 is arranged on the outer wall of each perforating segment 100 in the radial direction, and the first limiting screw hole 130 is arranged on the outer wall of each perforating segment 100 in the radial direction. The first limiting bolt 237 is inserted into each insertion hole. When it is necessary to adjust the radial angle of the connecting part 211 relative to the perforating segment 100, the first limiting bolt 237 is loosened, the connecting part 211 is rotated to the appropriate angle, and then the first limiting bolt 237 is tightened for fixation. A radial limiting is added between two adjacent perforating segments 100, which avoids the relative radial rotation between the two perforating segments 100 due to the relationship between the two end parts of the universal joint body 210 and the rotation connection thereof. At the same time, in combination with other limiting structures, the movement of the universal joint is limited in all directions, which improves the stability and reliability of the perforating gun during the downhole operation and ensures the accurate perforating operation.

[0040] Working principle: First, according to the geological conditions of the reservoir, such as the formation dip angle, rock hardness, etc., determine the required perforation angle of each perforation segment 100. First, connect multiple perforation segments 100 through the universal joint connecting assembly 200 in turn, pass the signal line through the wiring hole 120 at the top and bottom of each perforation segment 100, and connect them in series. When the angle between adjacent perforation segments 100 needs to be adjusted, since the two connecting parts 211 of the universal joint body 210 can rotate in the double-axis direction through the cross connecting shaft 212, the operator can directly rotate the connecting part 211. During the rotation process, the connecting ring 231 fixed outside the connecting part 211 will drive the arc-shaped extension part 232 connected to it to move, so that the connecting shaft 233 at the end of the arc-shaped extension part 232 slides in the arc-shaped sliding groove 222 of the arc-shaped part 221, thereby achieving preliminary adjustment of the angle of the perforation segment 100. However, during the adjustment process, the current position of the universal joint connecting assembly 200 may cause movement interference when the two connecting parts 211 rotate. At this time, the two connecting parts 211 and the limiting mechanism 220 are connected to the adjacent two perforation segments 100 through the connecting part 211, and the whole is rotated by 90°, and then the angle between the two connecting parts 211 can be adjusted in the other direction to meet different perforation requirements. When the perforation segment 100 is adjusted to the appropriate angle, the angle limiting operation is performed. On the one hand, insert the second limiting bolt 235 into the insertion hole on the surface of the corresponding second limiting lug plate 234, and thread the end of the second limiting bolt 235 into the second limiting screw hole 224 corresponding to the position, to limit the angle between the two connecting parts 211. In order to improve the stability of the limiting, the two groups of second limiting lug plates 234, second limiting bolts 235 and second limiting screw holes 224 are symmetrically arranged and work together. On the other hand, for the radial angle limiting of the connecting part 211 relative to the perforation segment 100, the first limiting bolt 237 is inserted into the insertion hole on the surface of the first limiting lug plate 236, and the end of the first limiting bolt 237 is threaded into the first limiting screw hole 130 arranged in the radial direction at one end of the perforation segment 100, so as to realize the angle fixation of the connecting part 211 in this direction. Through the cooperation of the two limiting methods, the three-axis limiting of the universal joint body 210 is realized, and the perforation segment 100 can be stably maintained at the set angle. After completing the angle adjustment and limiting, the perforating gun is lowered to the predetermined position in the well. When the detonation signal is transmitted to each perforation segment 100 through the signal line in the wiring hole 120, the perforating charge is triggered. The jet flow generated by the perforating charge will pass through the perforation channel 110. Since the perforation channel 110 has a larger diameter at one end towards the inside of the perforation segment 100 and a smaller diameter at the other end, it is designed in a tapered shape, which can focus the jet flow energy; at the same time, the spiral flow guide groove 111 opened on the inner wall of the perforation channel 110 will make the jet flow rotate, further enhancing the jet flow's ability to break up the reservoir rock, and ultimately achieving effective modification of the oilfield water injection reservoir.

[0041] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A structure of a perforating gun for oilfield water injection reservoir modification, characterized in that, The application relates to a perforating gun, which comprises a plurality of perforating segments connected in sequence, adjacent two perforating segments are movably connected through universal joint connecting assemblies, a plurality of groups of annularly distributed perforating channels are arranged on the side wall of each perforating segment, each universal joint connecting assembly comprises a universal joint body, the universal joint body comprises two oppositely arranged connecting parts arranged in an up-down mode, one end of each connecting part is rotationally connected with the end of the corresponding perforating segment, a cross connecting shaft is arranged between the opposite ends of the two connecting parts, each connecting part is rotationally connected with the two ends of the linearly extending shaft on the cross connecting shaft, a limiting mechanism is arranged on one side of each connecting part, a connecting mechanism is arranged on each connecting part, the limiting mechanism comprises an arc-shaped piece, an arc-shaped sliding groove is formed through one side surface of the arc-shaped piece, one end of each connecting mechanism is slidably connected in the arc-shaped sliding groove, a limiting piece is further arranged on one side outer wall of the arc-shaped piece and matched with the two connecting mechanisms.

2. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 1, characterized in that: A plurality of groups of perforating channels are evenly distributed along the extension direction of the perforating segments, the number of perforating channels in each group is three, and the three perforating channels are annularly and evenly distributed and connected with the inner and outer parts of the perforating segment.

3. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 1, characterized in that: The diameter of one end of each perforating channel towards the inner part of the perforating segment is larger than the diameter of the other end.

4. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 1, characterized in that: A spiral flow guide groove is formed in the inner wall of the circumference of each perforating channel.

5. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 1, characterized in that: A wiring hole is formed in the surface of the top end and the bottom end of each perforating segment and is communicated with the inner part of the perforating segment.

6. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 1, characterized in that: Each connecting mechanism comprises a connecting ring, the connecting ring is fixedly sleeved outside the corresponding connecting part, an arc-shaped extension part is integrally arranged on one side of the connecting ring, the arc-shaped extension parts of the two corresponding connecting mechanisms are oppositely arranged, the two arc-shaped extension parts are hollow and are provided with connecting shafts between the inner walls of the opposite end parts, and the two connecting shafts are located in the arc-shaped sliding groove.

7. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 6, characterized in that: The limiting piece comprises a limiting part integrally arranged on the outer wall of the arc-shaped piece away from the connecting part and having the same curvature as the arc-shaped piece, and two second limiting ear plates arranged on the outer walls of the corresponding arc-shaped extension parts, a plurality of second limiting screw holes are evenly distributed on one side surface of the limiting part along the extension direction of the limiting part, a plug hole is formed through the surface of each second limiting ear plate, a second limiting bolt is inserted in each plug hole, and one end of each second limiting bolt is threadedly connected in the corresponding second limiting screw hole.

8. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 7, characterized in that: The number of the second limiting ear plates, the second limiting bolts and the second limiting screw holes is two groups, the second limiting screw holes of the two groups are symmetrically formed on the two side surfaces of the limiting part, the second limiting ear plates of the two groups are oppositely arranged on the outer walls of the arc-shaped extension parts and located on the two sides of the hollow part, and the second limiting bolts are respectively inserted in the plug holes formed in the surface of the second limiting ear plates on the corresponding side.

9. The structure of the perforating gun for oilfield water injection reservoir reconstruction according to claim 6, characterized in that: Each of the arc-shaped extension parts is integrally provided with a first limiting lug plate near one end of the corresponding connecting part, the extending direction of the first limiting lug plate is parallel to the axis of the perforating segment, and a insertion hole is also provided through the surface of the first limiting lug plate, a first limiting bolt is inserted into each of the insertion holes, and a plurality of first limiting screw holes are provided through the outer wall of each of the perforating segments in a radial direction, and the first limiting screw holes are evenly distributed in a ring shape, and one end of the first limiting bolt is threadedly connected into the corresponding first limiting screw hole.

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