An electromagnetic fluid launch device and system for use in a well

Abstract

The utility model relates to the field of electromagnetic geophysical exploration in well, especially a kind of well fluid electromagnetic launch device and system, the electromagnetic launch device includes the carrier of floating in well fluid;Pull rope is arranged on the carrier top;First transmitting electrode, it can be connected to electromagnetic transmitter first end via first electric wire;Second transmitting electrode, it can be connected to electromagnetic transmitter second end via second electric wire;The second transmitting electrode is connected to the central position below the carrier, and the first transmitting electrode is connected to the position near the center below the carrier;The depth of the second transmitting electrode is greater than the depth of the first transmitting electrode.The utility model is based on the buoyancy effect of carrier and adjusts automatically with the change of fluid water level line in well, solves the electromagnetic launch problem of fluid in well, improves the electromagnetic signal strength of directly emitting in fluid in well, provides basic guarantee for interwell, well-ground electromagnetic method data acquisition original data quality.

Description

Technical Field

[0001] This utility model relates to the field of in-well electromagnetic geophysical exploration, and in particular to an in-well fluid electromagnetic emission device and system. Background Technology

[0002] Borehole electromagnetic methods are methods for studying electromagnetic induction phenomena in the time or frequency domain within a borehole. With the development of oil and gas resource exploration and development, the demand for underground fluid identification and exploration is increasing. While surface electromagnetic methods typically use surface-based transmitters, to improve the accuracy of underground fluid exploration, it is necessary to place the electromagnetic transmitter in the underground borehole fluid to enhance the intensity and depth of electromagnetic wave emission. However, due to the large borehole depth and small diameter, it is difficult to place both ends of the transmitting electrodes entirely in the underground fluid as in surface electromagnetic methods. Furthermore, during long-term underground fluid detection and monitoring, the water level changes constantly, making it impossible to ensure the transmitting electrodes remain in the fluid for extended periods, resulting in poor electromagnetic emission performance and failing to leverage the advantages and characteristics of borehole electromagnetic methods. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technical solutions, this utility model provides a well fluid electromagnetic launching device and electromagnetic launching system.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a platform floating in the fluid in the well; a pull rope disposed above the platform; a first transmitting electrode, which can be connected to a first end of an electromagnetic transmitter via a first wire; and a second transmitting electrode, which can be connected to a second end of an electromagnetic transmitter via a second wire. The second transmitting electrode is connected to the center position below the stage, and the first transmitting electrode is connected to the position near the center below the stage; the lowering depth of the second transmitting electrode is greater than the lowering depth of the first transmitting electrode.

[0005] The first transmitting electrode and the second transmitting electrode are positioned centrally below the platform and close to each other, so that the horizontal distance between the first transmitting electrode and the second transmitting electrode is as small as possible, and only the vertical distance difference represents the electrode distance; at the same time, the two electrodes are close to the central position below the platform, which enables the platform to maintain a relatively stable posture and improves the stability of continuous power supply.

[0006] In a preferred embodiment, the platform is a cylindrical platform made of a solid buoyancy material composed of polymer resin and hollow glass microspheres.

[0007] In a preferred embodiment, the second transmitting electrode is connected to the central position of the lowered platform at a variable specified distance to control and adjust the electrode distance between the two transmitting electrodes. Typical variable specified distances include 3m, 5m, and 10m to accommodate the needs of different electrode distance exploration scenarios.

[0008] The first transmitting electrode is positioned below the stage at a fixed depth, while the second transmitting electrode is positioned below the stage at a variable, specified length (depth). That is, the electrode distance between the two transmitting electrodes is adjusted and controlled based on the depth of the second electrode. Based on this concept, this application provides several optional implementation methods for different application scenarios and cost considerations.

[0009] As an optional implementation, a ring-shaped interface is provided below the platform, and the second transmitting electrode is attached to the ring-shaped interface with a rope of a variable, specified length. By selecting different lengths of rope to be attached to the ring-shaped interface before the device is lowered into the well, different lowering depths of the second transmitting electrode can be provided.

[0010] As an optional implementation, a rolling disk is located at the center below the platform. A rope of a variable, specified length is attached to the outer circumference of the rolling disk, and the end of the rope is connected to the second transmitting electrode. The rolling disk facilitates the storage of the rope, and its central location below the platform adds a counterweight to the connection between the second transmitting electrode and the platform, ensuring the overall center of the device is centered and maintaining a relatively stable posture during use.

[0011] As an optional implementation, a rolling disk is located at the center below the platform. A rope of a specified length is attached to the outer circumference of the rolling disk, and a limiting device is provided on the rolling disk to control the pull-out length of the rope. The end of the rope is connected to the second transmitting electrode. By adding a limiting device to the rolling disk, the work of changing ropes of different specified lengths can be reduced, thereby improving on-site work efficiency.

[0012] In a preferred embodiment, the end of the pull rope closest to the ground is provided with a scale mark. The scale on the pull rope at the ground end can display the changes in the well's surface in real time, maintaining the continuous signal transmission of the electromagnetic transmitter while improving the monitoring frequency of signal stability.

[0013] Another aspect of this application provides a well fluid electromagnetic emission system, including the electromagnetic emission device described above, and further including an electromagnetic transmitter disposed on the ground, having a first end and a second end for outputting electromagnetic signals; the first end is connected to the first emission electrode via the first wire; the second end is connected to the second emission electrode via the second wire.

[0014] In a preferred embodiment, the electromagnetic launching system further includes a winch mounted on the ground for retrieving and releasing the pull rope.

[0015] The beneficial effects of this utility model are: The electromagnetic emission device and system for well fluid provided by this utility model automatically adjusts according to the changes in the downhole fluid water level based on the buoyancy of the platform, solving the problem of downhole fluid electromagnetic emission. It keeps the emission electrode below the screen and continuously and stably emits signals, changing the traditional construction method of arbitrarily placing downhole electromagnetic emission electrodes. It greatly improves the intensity of electromagnetic signals directly emitted in downhole fluid and provides a basic guarantee for the quality of raw data acquisition by inter-well and well-to-surface electromagnetic methods.

[0016] Furthermore, this invention achieves multi-scale electromagnetic emission of downhole fluids by fixing the lowering depth of one electrode and adjusting the lowering depth of the other electrode. This significantly improves on-site construction efficiency and the success rate of downhole fluid electromagnetic emission, thereby helping to enhance the identification capabilities of downhole fluids such as oil, gas, and water, and providing a reliable hardware foundation for the country's new round of mineral exploration. Attached Figure Description

[0017] Figure 1 This is a half-section view of each component of the in-well fluid electromagnetic launcher before assembly, as shown in Example 1. Figure 2 This is a half-sectional view of the electromagnetic launcher for fluid in well 1, as shown in Example 1. Figure 3 Example 1: Top front view of the fluid electromagnetic launching device in the well; Figure 4 This is a front view of the lower part of the electromagnetic launching device for fluid in well 1, as shown in Example 1. Figure 5 Example 1: A half-sectional view of the well fluid electromagnetic emission device in use - emission electrode 3 meters away from the device; Figure 6 Example 1: A half-sectional view of the well fluid electromagnetic transmitter in use - transmitter electrode 5 meters away from the device; Figure 7 Example 1 shows the state of the electromagnetic emission device for fluid in wells in use - a half-section view of the device with the emission electrode 10 meters away.

[0018] The markings in the diagram are: 1-Emitting electrode A, 2-Emitting electrode B, 3-Stage, 4-Rolling disk, 5-Pull rope, 6-Copper core wire. Detailed Implementation

[0019] Further features and advantages of this invention will become more apparent from the following description with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings, and the drawings are not necessarily drawn to scale. However, the invention can be implemented in many different forms and should not be construed as necessarily limited to the exemplary embodiments shown herein. Rather, these exemplary embodiments are provided merely to illustrate the invention and to convey its spirit and essence to those skilled in the art.

[0020] Example 1 This utility model aims to provide an electromagnetic emission device for well fluid. Based on a platform 3 with buoyancy, it provides a relatively stable mounting platform for two emission electrodes (emission electrode A1 and emission electrode B2) relative to the surface of the well fluid. The two emission electrodes are set below the platform 3 by a lower suspension method. Under this relatively stable working foundation, the purpose of electromagnetic emission with different electrode spacing scales can be achieved based on the selectable different preset vertical distances between the two emission electrodes.

[0021] refer to Figure 1-4 A well fluid electromagnetic transmitter includes: a platform 3 made of solid buoyancy material; a pull rope 5 disposed above the platform; a transmitting electrode A1 disposed at a fixed distance below the platform 3, which can be connected to a first end of an electromagnetic transmitter via a copper core wire 6 connecting electrode A1; and a transmitting electrode B2 disposed at a variable specified distance below the platform 3, which can be connected to a second end of the electromagnetic transmitter via a copper core wire 6 connecting electrode B2.

[0022] The platform 3 is a cylindrical platform made of a solid buoyancy material composed of polymer resin and hollow glass microspheres, which provides sufficient buoyancy for the overall device while maintaining a certain material strength. As a typical example, the platform 3 can be made into a cylinder with a diameter of 12cm and a height of 2cm.

[0023] The transmitting electrode A1 and transmitting electrode B2 are positioned centrally below the platform 3 and close to each other, so that the horizontal distance between the transmitting electrode A1 and transmitting electrode B2 is as small as possible, and only the vertical distance difference represents the electrode distance; at the same time, the two electrodes are close to the central position below the platform 3, which enables the platform 3 to maintain a relatively stable posture and improve the stability of continuous power supply.

[0024] In this example, the transmitting electrode A1 is placed below the stage 3 at a fixed depth, while the transmitting electrode B2 is placed below the stage 3 at a variable specified length (depth). That is, the electrode distance between the two transmitting electrodes is adjusted and controlled based on the depth of transmitting electrode B2. Based on this concept, this example provides several optional implementation methods for different use cases and cost considerations.

[0025] As an optional implementation, a ring-shaped interface is provided below the platform 3, and the transmitting electrode B 2 is attached to the ring-shaped interface with a rope of variable, specified length. By selecting different lengths of rope to be attached to the ring-shaped interface before the device is lowered into the well, different lowering depths of the transmitting electrode B 2 can be provided.

[0026] As an optional implementation, a rolling disk 4 is provided at the center of the lower part of the platform 3. A rope of a variable length is attached to the outer circumference of the rolling disk 4, and the end of the rope is connected to the transmitting electrode B 2. The rolling disk 4 provides convenience for storing the rope. At the same time, the rolling disk 4, located at the center of the lower part of the platform 3, adds a counterweight to the connection between the transmitting electrode B 2 and the platform 3, so that the overall center of the device is centered and maintains a relatively stable posture when the device is in use.

[0027] As an optional implementation, a rolling disk 4 is provided at the center of the lower part of the platform 3. A rope of a specified length is attached to the outer circumference of the rolling disk 4, and a limiting device is provided on the rolling disk 4 to control the pull-out length of the rope. The end of the rope is connected to the transmitting electrode B 2. The addition of the limiting device can reduce the work of changing ropes of different specified lengths and improve the efficiency of on-site work.

[0028] In a typical implementation, a cylindrical rolling disk 4 with a diameter of 6 cm and a height of 2 cm is made of a non-conductive material such as plastic. A connecting plate is used to fix one end of the rolling disk 4 to a designated position at the bottom of the cylindrical platform 3. The other end of the rolling disk 4 is connected to the rotating shaft of the rolling disk 4 by a corresponding hole at the center position to achieve a bearing-like function. This allows the rolling disk 4 to rotate freely in the vertical plane, so that the transmitting electrode B 2 can pull out all or part of the length of the rope wound on the rolling disk 4 under its own weight in the well liquid, forming a well electromagnetic emission source with the transmitting electrode A 1 at a predetermined electrode distance.

[0029] As an optional implementation, the two emitting electrodes are made of highly conductive pure copper and are 4cm in diameter spherical electrodes. One of the spherical electrodes, serving as emitting electrode A1, is fixed to the side of the cylindrical platform 3 near the center using a pure copper plate. The other spherical electrode, serving as emitting electrode B2, is connected to a rolling disk 4 at the center of the platform 3 using a steel wire cable. The length of this steel wire cable can be selected in various ways depending on different tasks or effects, thereby achieving multi-scale electrode distance selection for emission. Typical specified distances for these various length selections include 3m, 5m, and 10m. Figure 5-7 The diagrams show the working state of the device when the electrode distance is 3m, 5m and 10m respectively. They clearly show the different electrode distances achieved by releasing the downward rope at different lengths based on the different lengths of the transmitting electrode B2.

[0030] The pull rope 5 is fixed above the cylindrical platform 3. In order to facilitate the lowering of the electromagnetic launching device into the well / pulling it out of the well to the ground in a more stable manner, the pull rope 5 includes two strands, which are respectively connected to the two sides of the upper surface of the platform 3.

[0031] One end of one of the two copper core wires 6 is connected to the transmitting electrode A1, and the other end is connected to port A of the ground electromagnetic transmitter; one end of the other copper core wire 6 is connected to the transmitting electrode B2, and the other end is connected to port B of the ground electromagnetic transmitter.

[0032] The method of using the well fluid electromagnetic transmitter of Example 1 includes: S1, placing the electromagnetic transmitter in the borehole; S2, waiting for the carrier plate 3 to float stably on the fluid surface and for the transmitting electrode B 2 to sink to a depth of one of the variable specified distances; S3, supplying power to the electromagnetic transmitter by connecting the transmitting electrode A 1 via its first end and the transmitting electrode B 2 via its second end.

[0033] The method of use also includes monitoring the rise and fall of the fluid surface by changing the length of the pull rope 6 set above the carrier plate 3, and the electromagnetic transmitter continues to supply power to the electromagnetic transmitter device during the rise and fall of the fluid surface.

[0034] The method of use also includes adjusting the variable specified distance according to different work task requirements. The various length options, i.e., typical variable specified distances, include 3m, 5m, and 10m, for example... Figure 5 For a downhole electromagnetic launching device with an electrode spacing of 3 meters, such as Figure 6 For a downhole electromagnetic launching device with an electrode spacing of 5 meters, such as Figure 7This is a downhole electromagnetic launching device with a supply electrode distance of 10 meters. As mentioned earlier, the supply electrode distance is changed by adjusting the lowering depth of the launching electrode B2. The lowering depth of the launching electrode B2 can be adjusted through various structures connecting the launching electrode B2 to the carrier plate 3, including but not limited to directly replacing ropes of different lengths, or controlling the lowering depth of the launching electrode B2 by using the rolling disc 4. Example 2 Example 2 provides a well fluid electromagnetic transmission system, including the electromagnetic transmission device described in Example 1, and further including an electromagnetic transmitter installed on the ground, which has an A port and a B port for outputting electromagnetic signals. One end of one of the two copper core wires 6 of the electromagnetic transmission device is connected to the transmitting electrode A1, and the other end is connected to the A port of the ground electromagnetic transmitter; one end of the other copper core wire 6 is connected to the transmitting electrode B2, and the other end is connected to the B port of the ground electromagnetic transmitter.

[0035] In a preferred embodiment, the electromagnetic launching system further includes a winch mounted on the ground for retrieving and releasing the pull rope 5.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A well fluid electromagnetic launching device, characterized in that, include: A platform that floats on the fluid in the well; A pull rope positioned above the platform; The first transmitting electrode is connected to the first end of the electromagnetic transmitter via a first wire; The second transmitting electrode can be connected to the second end of the electromagnetic transmitter via a second wire; The second transmitting electrode is connected to the center position below the stage, and the first transmitting electrode is connected to the position near the center below the stage; the lowering depth of the second transmitting electrode is greater than the lowering depth of the first transmitting electrode.

2. The electromagnetic launching device according to claim 1, characterized in that: The second emitting electrode with A variable, specified distance is connected to the central position of the platform.

3. The electromagnetic launching device according to claim 2, characterized in that: The variable specified distance Including 3m, 5m and 10m.

4. The electromagnetic launching device according to claim 1, characterized in that: The platform is made of polymer A cylindrical platform made of a solid buoyancy material composed of resin and hollow glass microspheres.

5. The electromagnetic launching device according to claim 2, characterized in that: The stage is provided with a ring-shaped interface below it, and the second transmitting electrode is attached to the ring-shaped interface with a rope of a variable length.

6. The electromagnetic transmitting device according to claim 2, characterized in that: The central position below the platform A rolling disk is provided, and a rope of a variable specified length is attached to the outer circumference of the rolling disk, the end of which is connected to the second transmitting electrode.

7. The electromagnetic launching device according to claim 2, characterized in that: The central position below the platform A rolling disk is provided, and a rope of a specified length is attached to the outer circumference of the rolling disk. The rolling disk is provided with a limiting device to control the pull-out length of the rope. The end of the rope is connected to the second transmitting electrode.

8. The electromagnetic launching device according to claim 1, characterized in that: The pull rope is close to the ground One end is marked with scale markings.

9. A well fluid electromagnetic launch system, characterized in that, Including the claims 1-8 The electromagnetic transmitting device also includes an electromagnetic transmitter installed on the ground, which has a first end and a second end for outputting electromagnetic signals. The first end is connected to the first emitting electrode via the first wire; The second end is connected to the second transmitting electrode via the second wire.

10. The electromagnetic launching system according to claim 9, characterized in that, Also includes those installed on the ground A winch is used to raise and lower the rope.

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