In-well receiving detector special for geophysical prospecting and embedding device

Abstract

The utility model discloses a geophysical prospecting dedicated in-well receiving geophone and an embedding device, comprising a geophone and an embedding device, a housing of the geophone is provided with a threaded through hole, and a detector is arranged in the housing; the embedding device comprises a variable-diameter rod, a tail cone and a connecting pipe, the upper end of the variable-diameter rod is connected with the connecting pipe, the lower end of the variable-diameter rod is connected with the tail cone, a detector is arranged on the variable-diameter rod, and the variable-diameter rod is arranged in the threaded through hole in a penetrating mode. The embedded device is suitable for receiving microseism logging seismic waves in a well, a receiving detector in the well is fixed on the embedded device, and all components of the embedded device are connected through threads, so that the stability is ensured, and the coupling between the detector and the ground is ensured. The tail cone is additionally arranged at the bottom of the embedding device, so that the quality of received seismic wave data is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of seismic detection, in particular to a downhole receiving geophone and a burying device for geophysical exploration. Background Technique

[0002] At present, when conducting microseismic logging, the conventional methods are to use downhole excitation and multiple geophones for surface reception, or a single geophone for downhole reception and surface excitation. The seismic wave data received on the ground is poorer than that received downhole. Currently, the downhole geophone reception faces technical problems such as poor downhole coupling and inaccurate control of the downhole depth. In order to solve this problem, improve the microseismic logging data, and solve the coupling between the seismic geophone and the earth and the acquisition depth when receiving data downhole, this patent provides a downhole receiving geophone and a burying device for geophysical exploration.

[0003] Other technicians have proposed the following new technologies for the above problems.

[0004] Publication No.: CN114325816A discloses a downhole detection device, including: an optoelectronic hybrid cable, a downhole pusher, and a geophone assembly. The optoelectronic hybrid cable supports and connects the downhole pusher; the downhole detection device is segmented by sequentially connecting a connection short section and a test short section, which is convenient for the downhole operation of the downhole detection device. In addition, the test short section includes a pusher. By applying electricity to control the pusher, the outer edge of the test short section can be closely attached to the well wall, realizing the rigid coupling contact between the fiber optic geophone and the well wall, facilitating the measurement of vibration signals in the oil well by the fiber optic geophone, and thus facilitating the use of the fiber Bragg grating geophone in the oil well environment.

[0005] Publication No.: CN221726250U discloses a geophone wire harness integration device and a micro-logging surface investigation device, including: a plurality of installation shells, a plurality of geophones, a connection wire harness, and a connection plug; the connection wire harness passes through the plurality of installation shells, and there is an installation cavity in the installation shell. When the connection wire harness passes through the installation shell, it passes through the installation cavity of the installation shell. The connection wire harness is not fixed to the installation shell, but is passed through in a movable manner. Therefore, the connection wire harness and the installation shell are detachably connected. Thus, in different exploration and acquisition environments, the number of installation shells can be increased or decreased to adapt to exploration drillings of different depths, and the width of the installation shell can be adjusted to adapt to exploration drillings of different diameters; thereby reducing the acquisition operation time and improving the acquisition operation efficiency.

[0006] Publication No.: CN217354347U discloses a multi-stage microseismic digital downhole geophone device, including: a ground control unit, a cable, a torpedo connector, and several stages of digital downhole geophones. Each stage of the digital downhole geophone includes a pushing and driving component, a pushing action component, and an electronic instrument component. The function of the ground control unit is to supply power to the multi-stage digital downhole geophones, send control commands to each stage of downhole geophones, and store the data collected at each stage. The cable is a link for power supply, communication, and interaction between the ground control unit and the multi-stage digital downhole geophones. The torpedo connector is used to cooperate with the cable to connect each stage of digital downhole geophones.

[0007] The above prior art has a complex structure and high production costs; the structure of this patent is simple, with low production costs, and has a higher coupling degree compared to the conventional technical solution.

[0008] In summary, the technical solutions, the technical problems to be solved, and the beneficial effects of the above disclosed technologies are all different from those of the present utility model. For more technical features, technical problems to be solved, and beneficial effects of the present utility model, there is no technical inspiration in the above disclosed technical documents. Summary of the Utility Model

[0009] Aiming at the above defects existing in the prior art, the purpose of the present utility model is to provide a downhole receiving geophone and burying device dedicated to geophysical exploration.

[0010] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0011] A downhole receiving geophone and burying device dedicated to geophysical exploration, including a geophone and a burying device. The outer shell of the geophone is provided with a threaded through hole, and a geophone instrument is arranged inside the shell; the burying device includes a reducing rod, a tail cone, and a connecting pipe. The upper end of the reducing rod is connected to the connecting pipe, the lower end of the reducing rod is connected to the tail cone, a geophone is arranged on the reducing rod, and the reducing rod is inserted into the threaded through hole.

[0012] Further, the outer shell of the geophone includes an upper shell and a lower shell;

[0013] Specifically, the lower shell is provided with an extension part protruding from the upper shell, and the extension part is provided with a threaded through hole, and a geophone instrument is arranged inside the shell;

[0014] Specifically, the upper shell and the lower shell are hermetically connected, the geophone instrument leads out an external wire, the external wire passes through the shell, and a sealant is arranged in the hole where the external wire passes through the shell.

[0015] Further, the upper shell and the lower shell are hermetically connected through a buckle and a rubber sealing ring.

[0016] Furthermore, the upper housing and the lower housing are fastened by bolts and sealed by rubber sealing rings.

[0017] Furthermore, the diameter-changing rod includes an upper external threaded rod and a lower internal threaded rod;

[0018] Specifically, a threaded counterbore is provided at the center of the lower end face of the lower internal threaded rod. The outer diameter of the upper external threaded rod is smaller than that of the lower internal threaded rod. The outer wall of the upper external threaded rod is threadedly connected to the threaded through-hole, and the upper end face of the lower internal threaded rod provides positioning for the geophone.

[0019] Specifically, the upper end of the upper external threaded rod is connected to the lower end of the connecting pipe, and the tail cone is connected to the threaded counterbore of the lower internal threaded rod.

[0020] Furthermore, the diameter-changing rod is a solid rod, and the connecting pipe is a hollow pipe.

[0021] Furthermore, the lower end outer wall of the connecting pipe is threadedly connected to an upper connecting nut, and the lower end inner wall of the upper connecting nut is threadedly connected to the upper external threaded rod.

[0022] Furthermore, the burying device further includes a connecting nut and at least one external threaded pipe;

[0023] Specifically, a through-thread is provided on the outer wall of the external threaded pipe;

[0024] Specifically, the lower end of the lowermost external threaded pipe is connected to the upper end inner wall of the lower connecting nut, and the upper end outer wall of the upper external threaded rod is threadedly connected to the lower end inner wall of the lower connecting nut;

[0025] Specifically, the external thread on the outer wall of the external threaded pipe can be threadedly connected to the threaded through-hole of the geophone;

[0026] Specifically, the uppermost external threaded pipe is connected to the connecting pipe through an upper connecting nut.

[0027] Furthermore, at least two external threaded pipes are provided, and each two external threaded pipes are connected by a middle connecting nut.

[0028] The utility model has the following beneficial effects compared with the prior art:

[0029] 1. The utility model is applicable to receiving microseismic logging seismic waves in a well. The downhole receiving geophone is fixed on the burying device, and each component of the burying device is connected by threads, ensuring stability and ensuring the coupling between the geophone and the ground.

[0030] 2. In the utility model, a tail cone is added at the bottom of the burying device to ensure the quality of the received seismic wave data.

[0031] 3. The utility model has a simple structure, low production cost, is easy to manufacture, and is suitable for popularization. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of a downhole receiving geophone and a burying device specialized for geophysical prospecting of the present utility model;

[0033] Figure 2 is a schematic structural diagram of the geophone in the present utility model;

[0034] Figure 3 is a schematic structural diagram of the reducing rod in the present utility model.

[0035] In the figure: 1. Geophone; 2. Reducing rod; 2.1 Upper external threaded rod; 2.2 Lower internal threaded rod; 2.3 Threaded counterbore; 3. Tail vertebra; 4. External connection wire; 5. Connecting pipe; 6. Upper connecting nut; 7. Threaded through hole; 8. Upper housing; 9. Lower connecting nut; 10. External threaded pipe; 11. Lower housing. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0037] Embodiment 1:

[0038] Please refer to Figures 1 to 3 , a downhole receiving geophone and a burying device provided by the present utility model, including a geophone 1 and a burying device.

[0039] The outer shell of the geophone 1 includes an upper housing 8 and a lower housing 11. The lower housing 11 is provided with an extension part protruding from the upper housing 8. The extension part is provided with a threaded through hole 7. A geophone instrument is arranged inside the outer shell. The upper housing 8 and the lower housing 11 are hermetically connected. The geophone instrument leads out an external connection wire 4. The external connection wire 4 passes through the outer shell, and a sealant is arranged in the hole where the external connection wire passes through the outer shell.

[0040] Preferably, the upper housing 8 and the lower housing 11 are hermetically connected through a buckle and a rubber sealing ring.

[0041] Another preferably, the upper housing 8 and the lower housing 11 are fastened by bolts and sealed by a rubber sealing ring, which is convenient for disassembly.

[0042] It should be noted that the geophone instrument itself is a prior art, and those skilled in the art are clear about this.

[0043] The burying device includes a reducing rod 2, a tail cone 3, and a connecting pipe 5. The reducing rod 2 includes an upper external threaded rod 2.1 and a lower internal threaded rod 2.2. A threaded counterbore 2.3 is provided at the center of the lower end face of the lower internal threaded rod 2.2. The outer diameter of the upper external threaded rod 2.1 is smaller than that of the lower internal threaded rod 2.2. The outer wall of the upper external threaded rod 2.1 is threadedly connected to a threaded through hole 7, that is, a geophone 1 is provided on the reducing rod 2. The upper end face of the lower internal threaded rod 2.2 provides positioning for the geophone 1. The upper end of the upper external threaded rod 2.1 is connected to the lower end of the connecting pipe 5, and the tail cone 3 is connected to the threaded counterbore 2.3 of the lower internal threaded rod 2.2.

[0044] Specifically, the reducing rod 2 is a solid rod, and the connecting pipe 5 is a hollow pipe, so that the center of gravity of the burying device moves downward.

[0045] Specifically, in this embodiment, an upper connecting nut 6 is threadedly connected to the outer wall of the lower end of the connecting pipe 5, and the inner wall of the lower end of the upper connecting nut 6 is threadedly connected to the upper external threaded rod 2.1.

[0046] Specifically, the reducing rod 2, the connecting pipe 5, the upper connecting nut 6, and the tail cone 3 are all made of metal materials.

[0047] Embodiment 2:

[0048] Based on Embodiment 1, in this embodiment, the burying device further includes a connecting nut 9 and at least one external threaded pipe 10. A through-thread is provided on the outer wall of the external threaded pipe 10. The lower end of the lowermost external threaded pipe 10 is connected to the inner wall of the upper end of the lower connecting nut 9. The outer wall of the upper end of the upper external threaded rod 2.1 is threadedly connected to the inner wall of the lower end of the lower connecting nut 9. One geophone 1 is threadedly connected to the outer wall of the external threaded pipe 10. The uppermost external threaded pipe 10 is connected to the connecting pipe 5 through an upper connecting nut 6.

[0049] Specifically, when at least two external threaded pipes 10 are provided, each two external threaded pipes 10 are connected through a middle connecting nut.

[0050] Specifically, different lengths of external connection wires 4 are provided for different geophones 1.

[0051] Among them, the upper end face of the lower connecting nut 9 and the upper end face of the middle connecting nut provide positioning for the corresponding geophones 1. The position of the geophones 1 is limited by controlling the number of connecting pipes 5 and the screwing-in length of the nuts. The tail cone 3 is inserted into the bottom of the well, and an integral rigid connection is formed between the geophone 1 and the tail cone 3 to ensure the coupling degree.

[0052] Embodiment 3:

[0053] Based on Embodiment 2, this embodiment provides a method for using a downhole receiving geophone and a burying device dedicated to geophysical exploration, which can adapt to the construction requirements of geophones with different depths and different receiving quantities by increasing or decreasing the number of connecting pipes 5 and external threaded pipes 10. The method includes the following steps:

[0054] S1. Select an appropriate number of geophones 1 according to the depth of the detection well. Each geophone 1 sets an external connection wire with a dedicated length according to the designed depth, and connect a downhole receiving geophone and a burying device dedicated to geophysical exploration according to Embodiment 2.

[0055] S2. Connect the connecting pipe 5 to the downhole rod through a coupling, lower it into the well, place a single or multiple bottom-hole receiving geophones 1 in the well according to the designed depth, insert the tail cone 3 into the bottom of the well, and form a rigid connection of the tail cone 3, geophone 1 through the reducing rod 2, external threaded pipe 10, and lower connecting nut 9, so as to achieve good stability in the well and coupling with the ground, ensuring the integrity and accuracy of the obtained data.

[0056] S3. The seismic waves generated during excitation are transmitted to the geophone 1 through the tail cone 3, reducing rod 2, lower connecting nut 9, and external threaded pipe 10, and then transmitted to the ground receiving instrument through the external connection wire 4.

[0057] In this application, the components themselves that are not elaborated and the connection methods of the various components in this application all belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0058] In the present utility model, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0059] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the present utility model.

[0060] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] The foregoing are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A downhole receiving geophone and burying device for geophysical prospecting, comprising a geophone and a burying device, characterized in that, The outer shell of the geophone is provided with threaded through holes, and a geodetic instrument is arranged inside the outer shell; The burying device includes a reducing rod, a tail cone, and a connecting pipe. The upper end of the reducing rod is connected to the connecting pipe, the lower end of the reducing rod is connected to the tail cone, a geophone is arranged on the reducing rod, and the reducing rod is inserted into the threaded through hole.

2. The borehole receiving geophone and burying device for geophysical prospecting according to claim 1, characterized in that, The outer shell of the geophone includes an upper shell and a lower shell; The lower shell is provided with an extension part protruding from the upper shell. The extension part is provided with threaded through holes, and a geodetic instrument is arranged inside the outer shell; The upper shell and the lower shell are hermetically connected. The geodetic instrument leads out an external wire, the external wire passes through the outer shell, and a sealant is arranged in the hole where the external wire passes through the outer shell.

3. The borehole receiving geophone and burying device for geophysical prospecting according to claim 2, wherein The upper shell and the lower shell are hermetically connected through buckles and rubber sealing rings.

4. The borehole receiving geophone and burying device for geophysical prospecting according to claim 2, characterized in that, The upper shell and the lower shell are fastened by bolts and sealed by rubber sealing rings.

5. The borehole receiving geophone and burying device for geophysical prospecting according to claim 1, wherein The reducing rod includes an upper external threaded rod and a lower internal threaded rod; A threaded counterbore is arranged at the center of the lower end face of the lower internal threaded rod. The outer diameter of the upper external threaded rod is smaller than that of the lower internal threaded rod. The outer wall of the upper external threaded rod is threadedly connected to the threaded through hole, and the upper end face of the lower internal threaded rod provides positioning for the geophone; The upper end of the upper external threaded rod is connected to the lower end of the connecting pipe, and the tail cone is connected to the threaded counterbore of the lower internal threaded rod.

6. The borehole receiving geophone and burying device for geophysical prospecting according to claim 5, characterized in that, The reducing rod is a solid rod, and the connecting pipe is a hollow pipe.

7. The borehole receiving geophone and burying device for geophysical prospecting according to claim 5, characterized in that, The outer wall of the lower end of the connecting pipe is threadedly connected to an upper connecting nut, and the inner wall of the lower end of the upper connecting nut is threadedly connected to the upper external threaded rod.

8. A borehole receiving geophone and burying device for geophysical prospecting according to claim 5, characterized in that, The burying device further includes a connecting nut and at least one external threaded pipe; The outer wall of the external threaded pipe is provided with through-thread; The lower end of the lowermost external threaded pipe is connected to the inner wall of the upper end of the lower connecting nut, and the outer wall of the upper end of the upper external threaded rod is threadedly connected to the inner wall of the lower end of the lower connecting nut; The external thread on the outer wall of the external threaded pipe can be connected to the threaded through hole of the geophone; The uppermost external threaded pipe is connected to the connecting pipe through an upper connecting nut.

9. The borehole receiving geophone and burying device for geophysical prospecting according to claim 8, characterized in that, At least two external threaded pipes are provided, and each two external threaded pipes are connected through a middle connecting nut.

Images