Distributed explosive source excitation device

Abstract

The utility model discloses a distributed explosive source excitation device, and relates to the technical field of seismic exploration, in particular to the distributed explosive source excitation device, which is used for multi-stage source excitation of micro-logging and comprises a flat cable piece, an exploder, a blasting harness and a plurality of blasting charges. The gun wire harness drives the multiple explosive packages to enter the micro-logging well at a time, the depths of the explosive packages in the micro-logging well are different, the explosive packages in the micro-logging well are detonated in sequence from bottom to top, and seismic waves generated by explosion of the explosive packages are picked up and collected by at least one detector. Through the fact of the device disclosed by the invention, the explosive charge is prevented from being repeatedly tripped into the micro-logging well, the problem that the well wall is easy to span after the explosive charge is excited and needs to be drifted or dug again is solved, and the construction efficiency is greatly improved. The seismic source depth error can be well controlled without repeatedly putting an explosive package into the micro-logging well, and the seismic wave measurement precision of the detector is improved. And the problem of data acquisition of the loess plateau ultra-deep twin-well micro-logging well is also solved.

Description

Technical Field

[0001] The utility model relates to the technical field of seismic exploration, in particular to a distributed explosive source excitation device. Background Art

[0002] In seismic exploration, the accuracy of surface geological structure investigation is crucial. It is related to whether a reliable basis can be provided for the selection of excitation factors for seismic data acquisition, and whether accurate static correction quantities can be extracted for data processing. Micro-logging technology is considered to be the most effective technical method for obtaining the above parameters. There are usually two methods for micro-logging data acquisition: one is ground micro-logging, which is to bury multiple detectors at a certain interval along the wellhead of the excitation well on the ground, and use detonators to excite at certain intervals in the well. The other method is in-well micro-logging, which is to excite the ground multiple times, receive seismic signals at certain intervals at different positions in the well, and obtain the first arrival time of the seismic wave.

[0003] Since the geophones in well micro-logging are difficult to couple well with the formation, the acquisition effect is poor. The geophones in the well pushed by the electric-controlled mechanical arm can couple well with the formation, but the circuit is complex and the operation cost is high. The method of ground micro-logging is to lay geophones on the ground and excite them in the well. Since the geophones are on the ground, the coupling problem with the formation can be solved well. The excitation in the well can also adjust the excitation dose according to the depth, which can ensure that the seismic waves in shallow, medium and deep formations have sufficient energy, and the initial arrival is clear, and the acquisition effect is good. Therefore, ground micro-logging has been widely used.

[0004] As shown in the published Chinese patent application, publication number: CN109991662A, patent name: Shallow formation two-dimensional or three-dimensional elastic parameter measurement and calculation device and method, as shown in the prior art, the acquisition method is to use a heavy hammer (or multiple connected in series at a certain interval), fix the detonator on it, connect the heavy hammer with the detonator by a cable, lower it into the well, and excite it once (3-4 times when the heavy hammer is connected in series), then lift it to the ground, reinstall the detonator, lower it into the well again, and excite it point by point from bottom to top. The construction device of this method is simple and flexible, and the excitation amount can be adjusted at any time according to the energy strength of the data. If an unqualified record occurs, it can be re-measured at any time. However, there are errors in construction efficiency and excitation depth. Another method is to use an electric spark source, lower the electrode head to the maximum depth, and excite it point by point upward. This method uses a non-explosive source, which reduces the safety risk, but the construction efficiency is low, and it is easy to cause the well wall to collapse, resulting in the electrode head and cable being unable to be removed, and the equipment safety risk is relatively large. To this end, the distributed explosive source excitation device of this scheme can install all explosive packages according to the designed excitation depth, be lowered into the well at one time, and excite point by point from deep to shallow, greatly improving measurement accuracy and construction efficiency. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies of the prior art, the utility model provides a distributed explosive source excitation device, which solves the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] To achieve the above purpose, the utility model is implemented by the following technical solutions: a distributed explosive source excitation device, which is used for multi-stage source excitation of micro-well logging, including a line arrangement component, a detonator, a gun line bundle and a plurality of explosive packages; the gun line bundle is composed of a plurality of gun lines with different lengths, each of which is arranged in sequence from long to short, and the upper ends of each gun line arranged in sequence from long to short are aligned and fixed by the line arrangement component, and the lower end of each gun line is fixedly connected with an explosive package, and the gun line is electrically connected to the explosive package; the detonator is electrically connected to the upper end of each gun line arranged from long to short, and the detonator detonates each explosive package through each gun line arranged from long to short, and each explosive package explodes in sequence from bottom to top in the micro-well logging; the distributed explosive source excitation device also includes at least one detector arranged on the ground and located around the wellhead of the micro-well logging, each explosive package explodes in sequence from bottom to top in the micro-well logging to generate a plurality of sources, and the detector detects the seismic waves emitted by each source.

[0009] Optionally, a heavy hammer is tied and hung at the lower end of the gun wiring harness.

[0010] Optionally, the gun line harness further includes at least one binding member, and the binding member is wound around the middle and lower part of each gun line.

[0011] Optionally, the binding member is a rope or a cable tie.

[0012] Optionally, the explosive pack is composed of explosives and at least one detonator, and the lead of the detonator is electrically connected to the lower end of the gun line.

[0013] Optionally, the cable arrangement member adopts a single-strand cable with a certain length. The cable arrangement member is folded in the middle to form two braided strips with fixed ends connected. The two braided strips are cross-woven to arrange each gun line in sequence.

[0014] Optionally, the cable arrangement member is made of plastic, and is in an elongated shape as a whole. A plurality of slots for securing the gun wires are provided on one side wall of the cable arrangement member.

[0015] (III) Beneficial effects

[0016] The utility model provides a distributed explosive source excitation device, which has the following beneficial effects:

[0017] The utility model proposes a distributed explosive source excitation device, in which a gun line bundle drives multiple explosive packs to be lowered into a micro-well logging at one time. Due to the difference in the length of each gun line in the gun line bundle, the depth of each explosive pack in the micro-well logging is different. The explosive packs in the micro-well logging are detonated in sequence from bottom to top, and the seismic waves generated by the explosion of the explosive packs are picked up and collected by at least one detector. The fact that the device shown in the present application is used can avoid repeatedly lowering explosive packs into the micro-well logging, and avoid the problem of the well wall being easily stepped on after the explosive packs are excited and needing to re-open the well or drill the well, thereby greatly improving the construction efficiency. There is no need to repeatedly lower explosive packs into the micro-well logging, which can well control the error of the source depth and improve the measurement accuracy of the detector for seismic waves. It also solves the data collection problem of the ultra-deep double-well micro-well logging in the Loess Plateau. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the distributed explosive source excitation device of the utility model after being lowered into the micro-well logging;

[0020] Figure 2 It is a front view structural schematic diagram of the distributed explosive source excitation device of the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the distributed explosive source excitation device of the utility model before multiple gun lines are bundled into a bundle;

[0022] Figure 4 It is a structural schematic diagram of the utility model of a distributed explosive source excitation device when the wiring arrangement parts arrange multiple gun lines;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the wiring arrangement member in the second embodiment of the distributed explosive source excitation device of the utility model.

[0024] In the figure: 1. gun line; 2. wire arrangement; 201. slot; 3. explosive pack; 4. heavy hammer; 5. gun line bundle; 6. detonator; 7. detector; 8. micro well logging. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indications or implications.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0027] For example, see Figures 1 to 4 The utility model provides a technical solution: a distributed explosive source excitation device, which is used for multi-level (or multiple) source excitation of micro-well logging 8, including a line arrangement 2, a detonator 6, a gun line bundle 5 and a plurality of explosive packages 3. The gun line bundle 5 is composed of a plurality of gun lines 1 with different lengths, each gun line 1 is arranged in sequence from long to short, and the upper ends of the gun lines 1 arranged in sequence from long to short are aligned and fixed by the line arrangement 2, and the lower end of each gun line 1 is fixedly connected to an explosive package 3, and the gun line 1 is electrically connected to the explosive package 3.

[0028] The detonator 6 is used to detonate the explosive package 3 through the gun line 1. The explosive package 3 is used to explode in the micro-well 8 to generate seismic waves at the explosion point. The wire arrangement member 2 is used to fix the upper ends of the gun lines 1 arranged in order from long to short. The wire arrangement member 2 plays the role of arranging the gun lines 1 in an orderly manner. Figure 3 , to prevent the staff from electrically connecting the detonator 6 to each gun line 1 in the wrong order.

[0029] The detonator 6 is electrically connected to the upper end of each of the firing lines 1 arranged from long to short, and the detonator 6 detonates each of the explosive packages 3 through each of the firing lines 1 arranged from long to short, and each of the explosive packages 3 explodes in sequence from bottom to top in the micro-well 8.

[0030] Among them, when detonating, the gun line bundle 5 is placed in the micro-well logging 8. Since the lengths of the gun lines 1 in the gun line bundle 5 are different, after the upper ends of the gun lines 1 are aligned, there is a height difference between the lower ends of the gun lines 1, and there is a height difference between the explosive packages 3 located at the lower ends of the gun lines 1. First, the detonator 6 is electrically connected to the upper end of the longest gun line 1, and the detonator 6 is started. The detonator 6 energizes and explodes the explosive package 3 located at the deepest part of the micro-well logging 8 through the longest gun line 1. At this time, an explosion occurs at the deepest part of the micro-well logging 8. Thereafter, the detonator 6 is electrically connected to the upper end of the second longest gun line 1, and the detonator 6 is started. The detonator 6 energizes and explodes the explosive package 3 located at the deepest part of the micro-well logging 8 through the second longest gun line 1. At this time, a second explosion occurs at the second deepest part of the micro-well logging 8. By analogy, the explosive packages 3 in the micro-well logging 8 are detonated in sequence from bottom to top, and the source excitation in the micro-well logging 8 is realized in a distributed manner.

[0031] The distributed explosive source excitation device also includes at least one detector 7 arranged on the ground and located around the wellhead of the micro-well 8. Each explosive package 3 explodes in the micro-well 8 from bottom to top in sequence to generate multiple sources, and the detector 7 detects the seismic waves emitted by each source.

[0032] The detector 7 is used to detect the seismic waves of each source in the micro-well logging 8, so as to realize the collection and picking of the seismic waves.

[0033] Specifically, a heavy hammer 4 is tied and hung at the lower end of the gun wire harness 5 .

[0034] The heavy hammer 4 is used to strengthen the lower end counterweight of the gun wire bundle 5 so that the gun wire bundle 5 is in a straightened state in the micro-well logging 8, thereby avoiding unreasonable distribution of the explosive package 3 caused by the bending of the gun wire bundle 5.

[0035] Specifically, the gun line bundle 5 further includes at least one binding member, which is wound around the middle and lower part of each gun line 1. The binding member is a rope or a cable tie.

[0036] The binding piece is used to fix the various gun lines 1 together in a bundle shape. The binding piece can also be made of a metal material with a certain hardness, covering the outside of each gun line 1, and protecting each gun line 1 without affecting the explosion, so as to avoid breaking the gun line bundle 5 due to the collapse of the bottom of the micro-well logging 8.

[0037] Specifically, the explosive pack 3 is composed of explosives and at least one detonator, and the lead of the detonator is electrically connected to the lower end of the gun line 1 .

[0038] The detonator 6 transmits electric current to the detonator through the gun line 1, and the detonator is ignited by electricity, thereby causing the entire explosive package 3 to explode.

[0039] Specifically, the cable arrangement member 2 adopts a single-strand cable with a certain length. The cable arrangement member 2 is folded in half along the middle to form two braided strips with fixed ends connected. The two braided strips are cross-woven to arrange the various gun lines 1 in sequence.

[0040] When the cable arrangement 2 is a single-strand cable with a certain length, refer to Figure 4 The two braided strips are first interwoven and bound to the outer side wall of the upper end of the longest gun line 1, and then interwoven and bound to the outer side wall of the upper end of the second longest gun line 1, and so on. Through this arrangement method, the upper ends of each gun line 1 from long to short are bound, so that each gun line 1 from long to short is arranged in sequence.

[0041] For example 2, please refer to Figure 5 The main difference between this embodiment and the first embodiment is that the wire arrangement member 2 is made of plastic, the wire arrangement member 2 is in a long strip shape as a whole, and a plurality of slots 201 for fixing the gun line 1 are provided on one side wall of the wire arrangement member 2.

[0042] The cable arrangement member 2 is used to fix the upper end of each gun line 1 through the clamping slot 201 , so that each gun line 1 is arranged and fixed in sequence from long to short. Each clamping slot 201 fixes the upper end of one gun line 1 .

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A distributed explosive source excitation device, which is used for multi-stage source excitation of micro-well logging (8), characterized in that: It comprises a wire arrangement component (2), a detonator (6), a gun wire bundle (5) and a plurality of explosive packages (3); the gun wire bundle (5) is composed of a plurality of gun wires (1) of different lengths, the gun wires (1) are arranged in order from long to short, and the upper ends of the gun wires (1) arranged in order from long to short are aligned and fixed by the wire arrangement component (2), the lower end of each gun wire (1) is fixedly connected to an explosive package (3), and the gun wire (1) is electrically connected to the explosive package (3); The detonators (6) are electrically connected to the upper ends of the respective firing lines (1) arranged from long to short, and the detonators (6) detonate the respective explosive packages (3) through the respective firing lines (1) arranged from long to short, and the respective explosive packages (3) explode in sequence from bottom to top in the micro-well (8); It also includes at least one detector (7) arranged on the ground and located around the wellhead of the micro-logging well (8). Each explosive pack (3) explodes in sequence from bottom to top in the micro-logging well (8) to generate multiple seismic sources, and the detector (7) detects seismic waves emitted by each seismic source.

2. The distributed explosive source excitation device according to claim 1, characterized in that: A heavy hammer (4) is tied and hung at the lower end of the gun wire harness (5).

3. The distributed explosive source excitation device according to claim 1, characterized in that: The gun line harness (5) further comprises at least one binding member, wherein the binding member is wound around the middle and lower part of each gun line (1).

4. The distributed explosive source excitation device according to claim 3 is characterized in that: The binding piece is one of a rope and a cable tie.

5. The distributed explosive source excitation device according to claim 1, characterized in that: The explosive package (3) is composed of explosives and at least one detonator, and the lead of the detonator is electrically connected to the lower end of the gun line (1).

6. The distributed explosive source excitation device according to claim 1, characterized in that: The cable arrangement member (2) is a single-strand cable of a certain length. The cable arrangement member (2) is folded in half along the middle to form two braided strips with ends fixedly connected. The two braided strips are cross-woven to arrange the various gun lines (1) in sequence.

7. The distributed explosive source excitation device according to claim 1, characterized in that: The cable arrangement member (2) is made of plastic and is in the shape of a long strip as a whole. A plurality of slots (201) for fixing the gun wires (1) are provided on one side wall of the cable arrangement member (2).

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