Downhole punch piezoelectric power pod

Abstract

The application discloses a downhole punch type piezoelectric power cabin, and belongs to the technical field of geological drilling and oil exploitation. The downhole punch type piezoelectric power cabin comprises, from top to bottom, a top joint, a piezoelectric cabin and a bottom joint which are sequentially screwed together; the top joint is provided with a fluid passage arranged in an axial direction at the top of the top joint; the piezoelectric cabin is used for accommodating a support, an upper punch, a first spring, a lower punch and a second spring; fluid discharge ports are uniformly arranged on the side wall of the piezoelectric cabin in a circumferential direction; in a first state, the upper punch is arranged at an initial position of the upper punch in the support and blocks the discharge pressure passage outlet of the upper punch; in a second state, the upper punch hits the lower punch, so that the lower punch moves downward and sequentially applies pressure to the second spring, a piezoelectric plate and a piezoelectric ceramic; the piezoelectric ceramic is electrically connected with a capacitor pulse type storage battery; the downhole punch type piezoelectric power cabin utilizes the piezoelectric effect to realize energy conversion, can further realize the self-sufficiency rate of electricity used by downhole electrical components, reduces the downhole accident risk caused by power shortage of an electrical sensor and greatly improves the drilling efficiency.

Description

A type of downhole ram-type piezoelectric power chamber Technical Field

[0001] This invention relates to the field of geological drilling and oil extraction technology, and in particular to a downhole ram-type piezoelectric power chamber. Background Technology

[0002] During geological drilling, obtaining information about the underground drilling conditions is a crucial parameter for real-time adjustments to the operating status of the machinery. Therefore, both measurement-while-drilling systems and downhole condition sensors require electrical power for support.

[0003] Currently, there are three ways to power related equipment. The first is to lay cables from the ground to the well. This method increases the overall economic cost of the project, and the replacement of drilling tools and the sealing and maintenance of the cables are time-consuming, thus reducing drilling efficiency. The second is to use batteries alone. Since batteries can only be charged and discharged once, replacing batteries also reduces drilling efficiency. The third is to utilize downhole operating conditions for power generation, which can achieve uninterrupted power supply during the working cycle. This method is the best combination of efficiency and effectiveness. Traditional power generation equipment or devices that utilize downhole operating conditions have strict requirements on drilling fluid and downhole operating conditions. When there are a lot of large rock cuttings in the drilling fluid, it may adversely affect the power generation capacity of the equipment or device, and may even damage the equipment in severe cases. Summary of the Invention

[0004] The purpose of this invention is to provide a downhole ram-type piezoelectric power chamber that utilizes the piezoelectric effect for energy conversion, which can further achieve the self-sufficiency rate of power for downhole electrical components, reduce the risk of downhole accidents caused by power shortages of electrical sensors, and greatly improve drilling efficiency.

[0005] The technical solution adopted by the present invention to achieve the above objectives is as follows: a downhole piezoelectric power chamber, comprising an upper connector, a piezoelectric chamber, and a lower connector that are sequentially threaded from top to bottom; the upper part of the upper connector has a fluid channel arranged axially; the piezoelectric chamber is used to house a support, an upper hammer, a first spring, a lower hammer, and a second spring; the side wall of the piezoelectric chamber has fluid outlets uniformly arranged circumferentially; the upper end of the support is coaxially threaded to the upper connector, and the interior of the support is connected to the fluid channel; The support is used to house the upper punch and the first spring. A pressure balance channel is provided on the side wall of the support. The lower part of the support extends inward in the circumferential direction to form a boss. When the upper punch is in the first state, the boss is used to block the outlet of the pressure discharge channel of the upper punch. The upper punch is coaxially arranged with the support. The upper punch has an inverted Y-shaped pressure discharge channel inside. The inlet of the inverted Y-shaped pressure discharge channel is connected to the fluid channel. The side wall of the upper punch has a pressure balance channel, and the pressure balance channel is connected to the inverted Y-shaped pressure discharge channel. The pressure balance channel and the pressure balance channel on the support work together to balance the drilling fluid pressure; the first spring is sleeved on the outside of the upper hammer; the lower hammer, the second spring, and the piezoelectric plate are coaxial and arranged sequentially from top to bottom; under the combined action of the pressure generated by the downhole coolant and the elastic force of the first spring, the upper hammer can reciprocate between the first state and the second state. In the first state, the upper hammer is set in the initial position of the upper hammer in the support and the pressure discharge channel outlet of the upper hammer is blocked. In the second state, the upper hammer strikes the lower hammer, causing the lower hammer to move downward and apply pressure to the second spring, the piezoelectric plate, and the piezoelectric ceramic in sequence; the lower connector is stepped and hollow inside, used to accommodate the piezoelectric plate, the piezoelectric ceramic, the insulating layer, and the capacitor pulse battery arranged sequentially from top to bottom along the axis; the piezoelectric ceramic is electrically connected to the capacitor pulse battery, which is used to store the electrical energy generated by the positive piezoelectric effect of the piezoelectric ceramic.

[0006] Furthermore, the upper outer side of the upper connector has threads for connecting the drill rod.

[0007] Furthermore, the upper punch is divided into a pendant part and a hammer head part, which are integral structures. The pendant part is a stepped cylinder with a larger diameter in the middle section and smaller diameters at both ends, and the diameters of the two ends are the same. The outer diameter of the middle section is the same as the inner diameter of the support. The pendant part has an inverted Y-shaped pressure relief channel inside, and a pressure balance channel is provided on the side wall of the pendant part, which is connected to the inverted Y-shaped pressure relief channel. The hammer head part is placed outside the support, and the hammer head is a cylindrical structure with an outer diameter larger than the inner diameter of the support. The bottom end of the first spring abuts against or is connected to the stepped surface of the boss on the support, and the upper punch and the lower punch are directly opposite each other.

[0008] Furthermore, the opening area of ​​the pressure balance channel on the upper punch and the support is smaller than the area of ​​the inverted Y-shaped pressure discharge channel of the upper punch.

[0009] Furthermore, the lower punch is a T-shaped punch, and a limiting protrusion for limiting the second spring is welded to the lower part of the lower punch.

[0010] Furthermore, the piezoelectric plate is made of stainless steel, and a limiting protrusion for limiting the second spring is welded to the upper surface of the piezoelectric plate.

[0011] Furthermore, an annular sealing ring is provided at the contact point between the piezoelectric plate and the piezoelectric chamber.

[0012] Furthermore, the piezoelectric ceramic is a ceramic material with a positive piezoelectric effect, and the lower section of the piezoelectric ceramic is soldered with wires.

[0013] Furthermore, the outer edge of the insulating layer is welded to the inner wall of the lower connector, and a hole is reserved in the insulating layer for the power supply line to pass through. The power supply line is used to connect the piezoelectric ceramic and the capacitor pulse storage battery.

[0014] Furthermore, the lower part of the lower connector is provided with an internal thread for connecting drilling tools or downhole electrical equipment.

[0015] Through the above design scheme, the present invention can bring the following beneficial effects: The piezoelectric power chamber provided by the present invention provides real-time power supply, reducing the time wasted due to fault maintenance and greatly improving work efficiency; compared with the traditional method of generating electricity under underground working conditions, this method is designed using the piezoelectric effect, and through some structural treatments, the power generation equipment does not come into contact with the fluid, and the power generation power is large, which can meet the needs of high-power electrical equipment in the well, reduce the phenomenon of electrical equipment shutdown due to insufficient power, improve reliability, and reduce related economic losses. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to understand the invention. They do not constitute an improper limitation of the invention. In the drawings:

[0017] Figure 1 is a cross-sectional view of the downhole ram-type piezoelectric power chamber;

[0018] Figure 2 is a schematic diagram of the upper hammer of the downhole ram-type piezoelectric power chamber;

[0019] Figure 3 is a top view of the piezoelectric chamber of the downhole ram-type piezoelectric power chamber;

[0020] Figure 4 is a side view of the piezoelectric chamber of the downhole ram-type piezoelectric power chamber;

[0021] Figure 5 is a schematic diagram of the working principle of the downhole ram-type piezoelectric power chamber, showing the downhole ram-type piezoelectric power chamber in its initial state.

[0022] Figure 6 is a schematic diagram of the working principle of the downhole ram-type piezoelectric power chamber. The downhole ram-type piezoelectric power chamber is in the downward state of the upper hammer.

[0023] Figure 7 is a schematic diagram of the working principle of the downhole ram-type piezoelectric power chamber. The downhole ram-type piezoelectric power chamber is in the ram-power generation state.

[0024] Figure 8 is a schematic diagram of the working principle of the downhole ram-type piezoelectric power chamber. The downhole ram-type piezoelectric power chamber is in the energy storage ram-press state.

[0025] The markings in the diagram are as follows: 1-Upper connector, 2-Fluid channel, 3-Support, 4-Upper punch, 5-First spring, 6-Piezoelectric chamber, 7-Lower punch, 8-Second spring, 9-Piezoelectric plate, 10-Piezoelectric ceramic, 11-Capacitor pulse battery, 12-Insulating layer, 13-Lower connector. Detailed Implementation

[0026] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments and accompanying drawings, further clarifies the invention. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0027] Please refer to Figures 1, 2, 3, 4, 5, 6, 7, and 8. This embodiment provides a downhole piezoelectric power chamber, including an upper connector 1, a piezoelectric chamber 6, and a lower connector 13 connected sequentially from top to bottom by threads. The upper part of the upper connector 1 has a fluid channel 2 arranged axially for circulating downhole drilling fluid and powering the upper hammer 4 to trigger the first state. The piezoelectric chamber 6 is used to house the support 3, the upper hammer 4, the first spring 5, the lower hammer 7, and the second spring 8. The middle sidewall of the piezoelectric chamber 6 has fluid outlets evenly distributed circumferentially. As a preferred embodiment, four fluid outlets are evenly distributed circumferentially along the piezoelectric chamber 6. The purpose of setting the fluid outlets is to allow the drilling fluid to be discharged from the inverted Y-shaped pressure discharge channel inside the upper hammer 4 into the fluid outlet located in the middle of the piezoelectric chamber 6 after the drilling fluid has been pressurized, and then to cool the bottom hole drill string and return the bottom hole cuttings. In use, the upper end of the upper connector 1 is connected to the drill pipe; the lower end of the lower connector 13 is connected to the drilling tools or downhole electrical equipment. The upper end of the support 3 is coaxially threaded to the upper connector 1, and the interior of the support 3 is connected to the fluid channel 2. The support 3 is used to accommodate the upper hammer 4 and the first spring 5. A pressure balance channel is provided on the side wall of the support 3. The lower part of the support 3 extends inward in the circumferential direction to form a boss. When the upper hammer 4 is in the first state, the boss is used to block the pressure discharge channel outlet of the upper hammer 4. The upper punch 4 is divided into a pendant section and a hammer head section, which are integrally formed. The pendant section is a stepped cylinder with a larger diameter in the middle section and smaller diameters at both ends, with the diameters at both ends being the same. The outer diameter of the middle section is the same as the inner diameter of the support 3, which serves to provide a sealing effect during energy storage and to transmit pressure to the first spring 5. When the upper punch 4 reciprocates up and down, it achieves the discharge of drilling fluid and energy storage. The pendant section has an inverted Y-shaped pressure discharge channel inside, the inlet of which is connected to the fluid channel 2. The side wall of the pendant section has a pressure balance channel, and the pressure... The balancing channel is connected to the inverted Y-shaped pressure relief channel to ensure the normal operation of the first spring 5. The area of ​​the pressure balancing channel is smaller than the area of ​​the inverted Y-shaped pressure relief channel inside the upper hammer 4, ensuring that the inverted Y-shaped pressure relief channel serves as the main flow channel for drilling fluid. This ensures that the device can quickly remove drilling fluid and has sufficient energy to excite the piezoelectric effect. The hammer head is located outside the support 3, and the hammer head has a cylindrical structure with an outer diameter larger than the inner diameter of the support 3. The bottom end of the first spring 5 abuts against or connects to the stepped surface of the boss on the support 3. The upper hammer 4 and the lower hammer 7 are directly opposite each other. The lower hammer 7 is a T-shaped hammer, cylindrical in shape. At its contact point with the second spring 8, it has a protrusion to limit the displacement of the second spring 8. This protrusion is welded to the lower hammer 7. The lower hammer 7, the second spring 8, and the piezoelectric plate 9 are arranged axially.The lower connector 13 is stepped and hollow inside, used to house the piezoelectric plate 9, piezoelectric ceramic 10, insulating layer 12, and capacitor pulse battery 11. The piezoelectric plate 9, piezoelectric ceramic 10, insulating layer 12, and capacitor pulse battery 11 are arranged sequentially from top to bottom along the axis. The piezoelectric ceramic 10 is electrically connected to the capacitor pulse battery 11, which stores the electrical energy generated by the positive piezoelectric effect of the piezoelectric ceramic 10. The piezoelectric plate 9 is a stainless steel plate of a certain thickness, with a maximum thickness of 10% and a minimum thickness of 5% of the piezoelectric ceramic 10. The piezoelectric plate 9 has a protrusion at its contact point with the second spring 8 to limit the displacement of the second spring 8. An annular sealing ring is placed in the annular gap between the piezoelectric chamber 6 and the protrusion of the piezoelectric plate 9 to prevent drilling fluid from entering the space containing the piezoelectric ceramic 10. The lower punch 7 is not connected to the piezoelectric plate 9. Instead, the force is transmitted through the compression and rebound generated by the second spring 8 during the compression process. This ensures that the piezoelectric ceramic 10 can withstand pressure while preventing it from being damaged by direct impact, thus extending its lifespan. The piezoelectric ceramic 10 is a ceramic material with a positive piezoelectric effect and has a certain strength, ensuring that the axial deformation of the material is less than 5% after 50,000 stamping cycles and that the material still exhibits a piezoelectric effect after 100,000 stamping cycles. For example, the piezoelectric ceramic 10 can be made of alumina. The lower section of the piezoelectric ceramic 10 is soldered with wires. The outer edge of the insulating layer 12 is welded to the inner wall of the lower connector 13, and holes for power supply wires to pass through are reserved in the insulating layer 12. The wires are used to connect the piezoelectric ceramic 10 to the capacitor pulse battery 11. The piezoelectric ceramic 10 is connected to the capacitor pulse-type storage battery 11 via the wire, and the two are soldered together. The insulating layer 12 is filled with a large amount of insulating, water-proof, and heat-insulating material, such as polystyrene foam, and has holes drilled in the middle for the wire to pass through. The capacitor pulse-type storage battery 11 is connected to the piezoelectric ceramic 10 via the wire and stores electrical energy. The capacitor pulse-type storage battery 11 is a commercially available product and belongs to the prior art, such as the Saifu brand MFO model capacitor pulse high-voltage storage battery.

[0028] Under the combined action of the downhole coolant pressure and the first spring 5, the upper hammer 4 can reciprocate between the first state and the second state. In the first state, the upper hammer 4 is set in the initial position of the upper hammer in the support 3, and the pressure relief channel on the side of the upper hammer 4 is blocked. In the second state, when the upper hammer 4 is impacted by the downhole coolant pressure and strikes the lower hammer 7, the lower hammer 7 moves downward and compresses the second spring 8. Through the delayed movement of the second spring 8, the piezoelectric ceramic 10 is squeezed, causing the piezoelectric ceramic 10 to undergo a polarization reaction and generate electrical energy. The capacitor pulse battery 11 is used to store the electrical energy transmitted by the piezoelectric ceramic 10.

[0029] Furthermore, the piezoelectric plate 9 is in contact with the piezoelectric ceramic 10. When the punch 7 squeezes the second spring 8, the second spring 8 will move downwards. However, the piezoelectric ceramic 10 cannot be directly squeezed. The piezoelectric plate 9 transmits this squeezing force without causing displacement, thus protecting the piezoelectric ceramic 10 and extending its service life.

[0030] Furthermore, the pressure balance channel on the side of the upper hammer 4 and the pressure balance channel on the side of the support 3 work together to further share the drilling fluid pressure when the upper hammer 4 is in the first state, ensuring that the first spring 5 works normally and resetting the upper hammer 4 to the initial second state, ensuring that the device can cycle repeatedly.

[0031] As shown in Figures 6, 7, and 8, the working principle of the downhole piezoelectric power chamber provided in this embodiment is as follows: the upper connector 1 and the lower connector 13 are connected to the drill pipe and the drill string, respectively. When the downhole piezoelectric power chamber starts to work, the downhole coolant flows into the inverted Y-shaped pressure discharge channel inside the upper hammer 4 along the fluid channel 2, and flows out through the fluid discharge outlet opened in the middle of the piezoelectric chamber 6, and flows down along the drill pipe into the bottom of the well to cool the bottom drill string and return the bottom cuttings.

[0032] When the downhole cooling fluid enters the well from the surface, it is pumped into the drill pipe by a surface water pump, gaining a certain pressure. At this time, due to the pre-stress of the first spring 5, the upper hammer 4 is in a high position. The support 3 blocks the pressure relief channel outlet on the side of the upper hammer 4. When the downhole cooling fluid accumulates a certain pressure, it pushes the upper hammer 4 downwards, compressing the first spring 5. The cooling fluid then flows out from the pressure relief channel outlet on the side of the upper hammer 4 through the fluid outlet in the middle of the piezoelectric chamber 6. The downward movement of the upper hammer 4 strikes the lower hammer 7, which is in a high position, causing the lower hammer 7 to move downwards and compress the second spring. 8. The second spring 8 is compressed, thus exerting a downward squeezing force on the piezoelectric plate 9. In turn, the piezoelectric plate 9 exerts pressure on the piezoelectric ceramic 10, causing it to undergo a polarization reaction and generate an instantaneous high-voltage pulse current. This current is conducted to the capacitor pulse-type storage battery 11 through the wire. After one squeezing operation, the pressure balance channel and the pressure discharge channel release most of the pressure of the drilling fluid. The first spring 5 and the second spring 8 respectively reset the lower hammer 7 and the upper hammer 4. The support 3 blocks the pressure discharge channel outlet of the upper hammer 4, and the downhole cooling fluid stores energy again to complete the next squeezing operation, thereby providing electrical energy for the downhole electrical components.

[0033] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A downhole press-type piezoelectric power chamber, characterized in that, The assembly includes an upper connector (1), a piezoelectric chamber (6), and a lower connector (13) connected sequentially from top to bottom by threads. The upper connector (1) has an axially arranged fluid channel (2) at its upper part. The piezoelectric chamber (6) is used to house the support (3), the upper punch (4), the first spring (5), the lower punch (7), and the second spring (8). The side wall of the piezoelectric chamber (6) has fluid outlets evenly distributed circumferentially. The upper end of the support (3) is coaxially threaded to the upper connector (1), and the interior of the support (3) is connected to the fluid channel (2). The support (3) is used to house the upper punch (4) and the first spring. (5) A pressure balance channel is provided on the side wall of the support (3). The lower part of the support (3) extends inward along the circumference to form a boss. When the upper punch (4) is in the first state, the boss is used to block the outlet of the pressure discharge channel of the upper punch (4). The upper punch (4) is coaxially arranged with the support (3). The upper punch (4) is provided with an inverted Y-shaped pressure discharge channel inside. The inlet of the inverted Y-shaped pressure discharge channel is connected to the fluid channel (2). The side wall of the upper punch (4) is provided with a pressure balance channel and the pressure balance channel is connected to the inverted Y-shaped pressure discharge channel. The pressure balance channel on the upper punch (4) and the pressure on the support (3) are connected. The balancing channels work together to balance the drilling fluid pressure; the first spring (5) is sleeved on the outside of the upper hammer (4); the lower hammer (7), the second spring (8), and the piezoelectric plate (9) are coaxial and arranged sequentially from top to bottom; under the combined action of the pressure generated by the downhole coolant and the elastic force of the first spring (5), the upper hammer (4) can reciprocate between the first state and the second state. In the first state, the upper hammer (4) is set in the initial position of the upper hammer (4) inside the support (3), and the pressure relief channel outlet of the upper hammer (4) is blocked. In the second state, the upper hammer (4)... The impact of the lower hammer (7) causes the lower hammer (7) to move downward and apply pressure to the second spring (8), piezoelectric plate (9) and piezoelectric ceramic (10) in sequence; the lower connector (13) is stepped and hollow inside, used to accommodate the piezoelectric plate (9), piezoelectric ceramic (10), insulating layer (12) and capacitor pulse battery (11) arranged sequentially from top to bottom along the axis; the piezoelectric ceramic (10) is electrically connected to the capacitor pulse battery (11), and the capacitor pulse battery (11) is used to store the electrical energy generated by the positive piezoelectric effect of the piezoelectric ceramic (10).

2. The downhole ram-type piezoelectric power chamber according to claim 1, characterized in that: The upper outer side of the upper connector (1) has threads for connecting the drill rod.

3. The downhole press-type piezoelectric power chamber according to claim 1, characterized in that: The upper punch (4) is divided into a pendant part and a hammer head part. The pendant part and the hammer head part are integrated structures. The pendant part is a stepped cylinder with a larger diameter in the middle section and a smaller diameter at both ends. The diameters of the two ends are the same. The outer diameter of the middle section is the same as the inner diameter of the support (3). The pendant part is provided with an inverted Y-shaped pressure relief channel inside. The side wall of the pendant part is provided with a pressure balance channel and the pressure balance channel is connected to the inverted Y-shaped pressure relief channel. The hammer head part is placed outside the support (3). The hammer head part is a cylindrical structure. The outer diameter of the hammer head part is larger than the inner diameter of the support (3). The bottom end of the first spring (5) abuts against or is connected to the stepped surface of the boss of the support (3). The upper punch (4) and the lower punch (7) are directly opposite each other.

4. The downhole ram-type piezoelectric power chamber according to claim 1 or 3, characterized in that: The opening area of ​​the pressure balance channel on the upper punch (4) and the support (3) is smaller than the area of ​​the inverted Y-shaped pressure discharge channel of the upper punch (4).

5. The downhole ram-type piezoelectric power chamber according to claim 1, characterized in that: The lower punch (7) is a T-shaped punch, and a limiting protrusion for limiting the second spring (8) is welded to the lower part of the lower punch (7).

6. The downhole ram-type piezoelectric power chamber according to claim 1, characterized in that: The piezoelectric plate (9) is a stainless steel plate, and the upper surface of the piezoelectric plate (9) is welded with a limiting protrusion for limiting the second spring (8).

7. The downhole ram-type piezoelectric power chamber according to claim 1, characterized in that: An annular sealing ring is provided at the contact point between the piezoelectric plate (9) and the piezoelectric chamber (6).

8. The downhole ram-type piezoelectric power chamber according to claim 1, characterized in that: The piezoelectric ceramic (10) is a ceramic material with a positive piezoelectric effect, and the lower section of the piezoelectric ceramic (10) is soldered with wires.

9. The downhole ram-type piezoelectric power chamber according to claim 1, characterized in that: The outer edge of the insulating layer (12) is welded to the inner wall of the lower connector (13), and a hole is reserved on the insulating layer (12) for the power supply line to pass through. The power supply line is used to connect the piezoelectric ceramic (10) and the capacitor pulse battery (11).

10. The downhole ram-type piezoelectric power chamber according to claim 1, characterized in that: The lower connector (13) is provided with an internal thread for connecting drilling tools or downhole electrical equipment.

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