A high frequency pulse generator for underground use

Abstract

The present invention discloses a high-frequency pulse generator for underground use, which relates to the technical field of underground logging equipment, and comprises an upper shell, wherein a buffer body and a lower shell are respectively fixed at both ends of the upper shell, a buffer chamber is provided at the lower end of the buffer body, and a regulating valve is provided at the upper end; a plunger body extending into the upper shell is fixed at the upper part of the lower shell, an annular connecting groove is provided at the upper end of the plunger body, and a plurality of axially slidable balancing columns are evenly arranged at the bottom of the annular connecting groove; a cooling buffer device and an electromagnetic pulse vibration device are provided between the plunger body and the buffer body. The present invention has good anti-seismic performance, effective heat dissipation and cooling performance, and intelligent pressure control function, and can adapt to and resist potential damage to the equipment caused by extreme conditions such as high pressure, high temperature, impact and corrosion in underground wells, and can work stably and efficiently even in the complex environment of deep wells, solving the technical problem that the existing devices are difficult to ensure long-term reliable operation in high pressure, high temperature, strong impact and corrosion environments.

Description

Technical Field

[0001] The invention relates to the technical field of downhole logging equipment, and in particular to a downhole high-frequency pulse generator. Background Art

[0002] In the field of oil and gas exploration, downhole high-frequency pulse generators are the core equipment for important geological detection methods such as electrical logging. Existing downhole high-frequency pulse generators often face problems such as poor pressure adaptability, poor heat dissipation, weak seismic performance and insufficient sealing, which limits their ability to operate stably for a long time in the complex environment of deep wells.

[0003] The patent document with the Chinese invention patent publication number CN115898383A discloses a downhole pulse signal generating device, which includes a non-magnetic drill collar, a connecting shaft is provided in the non-magnetic drill collar, and a generating unit and a driving unit are sequentially arranged on the connecting shaft. The generating unit includes a rotor, an adjusting stator and a modulating mover arranged in sequence, the rotor is configured to be able to rotate relative to the connecting shaft but not to move, the adjusting stator is configured to be fixed in the generating unit and cannot rotate and move relative to the connecting shaft, and the modulating mover is configured to be able to move relative to the connecting shaft but not to rotate. The driving unit includes an excitation module arranged adjacent to the modulating mover, and a motor for driving the connecting shaft to rotate. The modulating mover is configured to move toward or away from the adjusting stator under the action of the excitation module, thereby changing the flow area of ​​the fluid flowing through the non-magnetic drill collar to generate a pulse signal.

[0004] The above-mentioned pulse signal generating device generates pulse signals by utilizing the change of fluid flow area, and combines the interaction between motor drive and magnetic elements to realize the generation and transmission of downhole pulse signals. However, after careful analysis, it is found that it still has certain limitations. For example, there may be certain deficiencies when dealing with extreme conditions in deep well environments, especially in terms of device stability, seismic resistance, heat dissipation and cooling efficiency, and pressure regulation. This makes it difficult to ensure long-term reliable operation in high pressure, high temperature, strong impact and corrosion environments. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art and to provide a high-frequency pulse generator for underground use. The high-frequency pulse generator has good anti-seismic performance, effective heat dissipation and cooling performance, and intelligent pressure control function. It can adapt to and resist potential damage to the equipment caused by extreme conditions such as high pressure, high temperature, impact and corrosion underground. It can work stably and efficiently even in the complex environment of deep wells, solving the technical problem that existing devices are difficult to ensure long-term reliable operation under high pressure, high temperature, strong impact and corrosion environments.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A high-frequency pulse generator for underground use comprises an upper shell, a buffer body is fixed to the upper part of the upper shell, a buffer chamber is provided at the lower end of the buffer body, and a regulating valve communicating with the buffer chamber is provided at the upper end of the buffer body; a lower shell is fixed to the lower end of the upper shell, a plunger body extending into the upper shell is fixed to the upper part of the lower shell, an annular communication groove is provided at the upper end of the plunger body, and a plurality of axially slidable balancing columns are evenly arranged at the bottom of the annular communication groove; a cooling buffer device and an electromagnetic pulse vibration device are provided between the plunger body and the buffer body, wherein:

[0008] The cooling buffer device comprises a first shell, a second shell and a third shell which are fixedly sleeved in sequence from the inside to the outside, a first cooling chamber which is communicated with the buffer chamber is arranged in the first shell, a second cooling chamber is arranged between the first shell and the second shell, a third cooling chamber which is communicated with the annular connecting groove is arranged between the second shell and the third shell, the first cooling chamber, the second cooling chamber and the third cooling chamber are communicated with each other in sequence, and the first cooling chamber, the second cooling chamber, the third cooling chamber, the annular connecting groove and the buffer chamber are all filled with heat-conducting lubricating oil;

[0009] The electromagnetic pulse vibration device includes a coil, a magnet and a non-magnetic pulse body. The non-magnetic pulse body is movably arranged in the first cooling chamber, and the magnet is evenly fixed on the non-magnetic pulse body; the coil is located in the second cooling chamber and fixedly sleeved on the first shell. The coil and the magnet cooperate to make the non-magnetic pulse body vibrate up and down along the axial direction of the first shell.

[0010] A pulse column is fixed at the lower end of the non-magnetic pulse body. The pulse column penetrates the first shell and the plunger body in sequence downwards and then enters the lower shell. The penetrating part of the pulse column can slide up and down.

[0011] A step hole is provided at the bottom of the annular connecting groove, which passes through the plunger body. The step hole includes a large inner diameter hole and a small inner diameter hole. A guide hole corresponding to the step hole is provided in the lower shell body. One end of the balancing column is limited in the large inner diameter hole, and the other end is limited in the guide hole after passing through the small inner diameter hole.

[0012] A partition is provided at the upper end of the first shell, and a buffer hole connecting the buffer chamber and the first cooling chamber is opened on the partition; a plurality of first one-way valves are fixed to the lower end of the first shell, a plurality of second one-way valves are fixed to the upper end of the second shell, and a plurality of one-way connecting pipes are fixed between the top of the third shell and the partition, the first cooling chamber and the second cooling chamber are connected through the first one-way valve, the first cooling chamber and the third cooling chamber are connected through the one-way connecting pipe, and the second cooling chamber and the third cooling chamber are connected through the second one-way valve.

[0013] The diameter of the buffer hole is smaller than the diameter of the one-way connecting pipe.

[0014] The first one-way valve, the second one-way valve and the one-way connecting pipe are uniformly distributed around the axis of the first shell.

[0015] The highest liquid level of the heat-conducting lubricating oil in the buffer chamber is no higher than one-third of the buffer chamber near one end of the partition.

[0016] The non-magnetic pulse body is evenly provided with a plurality of guide holes along the axial direction, the upper ends of the guide holes are fixed with elastic diaphragms for blocking the guide holes by bolts, and the lower ends of the guide holes are communicated with the first cooling chamber.

[0017] The coil is electrically connected to an external device through a wire, the outer end of the coil is covered with an insulating coating, and gaps are left between the multiple wires on the coil.

[0018] The buffer body includes an integrally formed upper threaded section and a lower conical section, the buffer chamber is opened from the lower end surface of the lower conical section toward the upper threaded section, and the regulating valve is fixed on the upper threaded section; the upper shell body is provided with an internal threaded section and a conical surface corresponding to the upper threaded section and the lower conical section respectively.

[0019] The advantages of adopting the present invention are:

[0020] 1. The present invention has the advantage of excellent anti-seismic performance; the entire pulse generator adopts a multi-layer shell structure, combined with a buffer body and a thermally conductive lubricating oil design to form multiple buffer absorption links. When subjected to external impact, the buffer body between the upper shell and the lower shell and the thermally conductive lubricating oil can effectively weaken the impact energy, and the elastic deformation of the non-magnetic pulse body and pulse column in the first shell during the sliding process can also play a certain buffering role. In addition, the multiple balancing columns evenly distributed around the pulse column also produce tiny vibrations when subjected to force, which together enhance the overall anti-seismic ability of the equipment. Due to the design of the buffer body and thermally conductive lubricating oil, the pulse generator can adapt to downhole pressure fluctuations during operation and maintain internal and external pressure balance through dynamic adjustment of its own structure, which not only helps to reduce equipment damage caused by pressure differences, but also improves its long-term operation stability and durability.

[0021] 2. The present invention also has the advantage of excellent impact resistance; when the upper shell, the third shell, the second shell and the first shell are deformed by external impact, the internal heat-conducting lubricating oil will flow or squeeze accordingly under the pressure of the shell deformation. This dynamic response mechanism enables multiple balancing columns to move back and forth slightly in the plunger body according to the pressure change, thereby absorbing and dispersing part of the impact energy. The impact force is transmitted through the liquid medium, which can effectively reduce the stress concentration effect, reduce the impact force directly received by the internal components of the equipment, and play a good buffering effect. At the same time, the continuous lubrication layer formed by the heat-conducting lubricating oil between the components can also reduce friction resistance, avoid jamming or wear problems caused by impact, and further improve the overall anti-seismic performance and service life of the pulse generator.

[0022] 3. The present invention also has the advantages of excellent sealing performance and space utilization; the tight connection and thread matching design between the upper shell and the lower shell, as well as the components, enhances the sealing of the entire device, effectively prevents drilling fluid or other underground fluids from entering the interior, and protects the internal precision electronic components from corrosion damage. By integrating key components such as coils, magnets, vibration mechanisms and heat dissipation systems into a compact and interactive unit, it is helpful to simplify the assembly process, reduce the difficulty of maintenance, and improve space utilization, making it more suitable for use in narrow underground environments.

[0023] 4. The present invention also has the advantages of improved energy transfer efficiency and optimized signal quality; the sliding connection method ensures that the vibration energy is efficiently transmitted from the non-magnetic pulse body to the formation, and the presence of the balance column helps to evenly disperse the heat-conducting lubricating oil and transfer energy, thereby improving the quality of the detection signal.

[0024] 5. The present invention also has the advantages of efficient operation and good protection; through electromagnetic drive and pressure balance mechanism, the pulse generator can realize the stable generation of high-frequency pulse signals in the underground environment, and effectively adapt to the pressure changes inside the deep well, reduce the risk of equipment damage caused by pressure difference, and improve the stability and durability of the long-term operation of the equipment.

[0025] 6. The present invention also has the advantage of precise heat dissipation and cooling function; the integrated vibration mechanism, coil and heat dissipation system work together to ensure that heat is quickly transferred from the heat-generating part to the upper shell and dissipated through the environment, achieving efficient heat dissipation and ensuring the stable operation of the pulse generator under high-power operation.

[0026] 7. The present invention also has the advantages of fine pressure regulation and buffering; when the external pressure changes, the balance column cooperates with the heat-conducting lubricating oil to flow in the shell and adjust the pressure to achieve internal and external pressure balance. At the same time, the design of the buffer chamber can buffer and protect the external pressure and maintain the pressure stability of the system.

[0027] 8. The present invention also has the advantages of intelligent pressure regulation and safety protection; through the regulating valve on the top of the buffer body, the internal pressure can be adjusted according to different depths or complex formation conditions to ensure the pressure balance of the entire system, and the heat transfer lubricating oil level control in the buffer chamber ensures that the equipment can still operate safely under extreme pressure conditions.

[0028] 9. In general, the present invention has good anti-seismic performance, effective heat dissipation and cooling performance, and intelligent pressure control function, etc. It can adapt to and resist potential damage to the equipment caused by extreme conditions such as high pressure, high temperature, impact and corrosion underground. Even in the complex environment of deep wells, it can enable the pulse generator to operate reliably for a long time under high pressure, high temperature, strong impact and corrosion environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of the overall structure of the present invention (front view);

[0030] Figure 2 It is a cross-sectional view of the overall structure of the present invention (reverse);

[0031] Figure 3 It is a front view of the present invention;

[0032] Figure 4 It is the AA cross-sectional view of the present invention;

[0033] Figure 5 It is the BB cross-sectional view of the present invention;

[0034] Figure 6 It is a CC cross-sectional view of the present invention;

[0035] Figure 7 It is the DD cross-sectional view of the present invention;

[0036] Figure 8 It is the EE cross-sectional view of the present invention;

[0037] Fig. 9 It is the FF cross-sectional view of the present invention;

[0038] Fig.10 It is an enlarged view of G of the present invention;

[0039] Fig.11 The explosion of the present invention Figure 1 ;

[0040] Fig.12 The explosion of the present invention Figure 2 ;

[0041] Fig.13 The explosion of the present invention Figure 3 ;

[0042] Fig.14 The explosion of the present invention Figure 4 ;

[0043] Fig.15 The explosion of the present invention Figure 5 ;

[0044] Fig.16 The explosion of the present invention Figure 6 ;

[0045] Fig.17 It is an enlarged view of H of the present invention.

[0046] Marked in the figure are: 1. upper shell; 2. lower shell; 3. buffer body; 4. plunger body; 5. first shell; 6. coil; 7. second shell; 8. third shell; 9. non-magnetic pulse body; 10. pulse column; 11. balance column; 12. first one-way valve; 13. second one-way valve; 14. one-way connecting pipe; 15. partition; 16. first cooling chamber; 17. second cooling chamber; 18. third cooling chamber; 19. buffer chamber; 20. buffer hole; 21. guide hole; 22. elastic diaphragm; 23. regulating valve. DETAILED DESCRIPTION

[0047] like Figure 1-17 As shown, a downhole high-frequency pulse generator comprises an upper housing 1, wherein:

[0048] The upper shell 1 is a hollow structure, the upper part of the upper shell 1 is a variable diameter section with a successively increasing inner diameter, the lower part of the upper shell 1 is a diameter section, a buffer body 3 is fixed to the upper part of the upper shell 1, a buffer chamber 19 is opened at the lower end of the buffer body 3, and a regulating valve 23 communicated with the buffer chamber 19 is provided at the upper end of the buffer body 3.

[0049] The lower end of the upper shell 1 is fixed with the lower shell 2, and a support is provided in the lower shell 2. The upper part of the lower shell 2 is fixed with a plunger body 4 through the support. The upper end of the plunger body 4 extends upward into the upper shell 1, and the outer diameter of the plunger body 4 is adapted to the inner diameter of the lower end of the lower shell 2. In addition, an annular communication groove is provided at the upper end of the plunger body 4, and the axis of the annular communication groove coincides with the axis of the plunger body 4. A plurality of axially slidable balance columns 11 are evenly arranged at the bottom of the annular communication groove.

[0050] In addition, a cooling buffer device and an electromagnetic pulse vibration device are provided between the plunger body 4 and the buffer body 3, and the specific structures are as follows:

[0051] The cooling buffer device comprises a first shell 5, a second shell 7 and a third shell 8 which are fixedly sleeved from the inside to the outside in sequence. The first shell 5 can be fixedly abutted between the buffer body 3 and the plunger body 4, the second shell 7 is fixedly sleeved on the first shell 5, the outer diameter of the third shell 8 is adapted to the inner diameter of the middle and lower part of the upper shell 1, the third shell 8 can be fixedly abutted between the buffer body 3 and the plunger body 4, or can be fixedly sleeved on the second shell 7, and after being fixed, the third shell 8 is located between the buffer body 3 and the outer side wall of the annular connecting groove. In addition, a first cooling chamber 16 communicating with the buffer chamber 19 is provided in the first shell 5, a second cooling chamber 17 is provided between the first shell 5 and the second shell 7, and a third cooling chamber 18 communicating with the annular connecting groove is provided between the second shell 7 and the third shell 8. The first cooling chamber 16, the second cooling chamber 17 and the third cooling chamber 18 are connected to each other in sequence, and the first cooling chamber 16, the second cooling chamber 17, the third cooling chamber 18, the annular connecting groove and the buffer chamber 19 are all filled with heat-conducting lubricating oil.

[0052] The electromagnetic pulse vibration device includes a coil 6, a magnet and a non-magnetic pulse body 9. The non-magnetic pulse body 9 is preferably a cylindrical structure and is movably arranged in the first cooling chamber 16. The magnet is evenly fixed on the non-magnetic pulse body 9, and the fixing method can be adhesive or clamping. The coil 6 is located in the second cooling chamber 17 and is fixedly sleeved on the first shell 5. The coil 6 is electrically connected to the external device through a wire. After the coil 6 is energized, it can generate electromagnetic force. Under the action of the electromagnetic force, it can cooperate with the magnet to make the non-magnetic pulse body 9 vibrate up and down along the axial direction of the first shell 5. This vibration causes the non-magnetic pulse body 9 to generate high-frequency reciprocating motion in the first shell 5 along the axial direction, thereby forming a pulse signal for geological detection.

[0053] It should be noted that when the non-magnetic pulse body 9 vibrates up and down in the first shell 5 , the multiple balancing columns 11 produce a certain degree of slight vibration according to the change of the heat-conducting lubricating oil pressure, thereby buffering and balancing the movement impact of the non-magnetic pulse body 9 .

[0054] According to a preferred embodiment of the present invention, Figure 1-4 As shown in Figures 9 and 11, the buffer body 3 includes an upper threaded section and a lower conical section which are integrally formed. An internal threaded section and a conical surface are respectively provided in the reducing section of the upper shell body 1. The internal threaded section and the conical surface respectively correspond to the upper threaded section and the lower conical section. The buffer body 3 is fixed in the upper shell body 1 through the upper threaded section and the internal threaded section. When the buffer body 3 is fixed in the upper shell body 1, the lower conical section of the buffer body 3 just abuts against the conical surface of the upper shell body 1.

[0055] In addition, the buffer chamber 19 is opened from the middle of the lower end face of the lower conical section toward the upper thread section and extends to the lower end of the upper thread section. The regulating valve 23 is fixed at the middle of the upper end of the upper thread section and is connected to the external equipment through a pipeline. The pressure in the buffer chamber 19 can be adjusted by cooperating with the regulating valve 23, which is conducive to adapting to the working requirements at different depths or complex formation conditions, thereby maintaining the pressure balance and stability of the entire system.

[0056] According to a preferred embodiment of the present invention, Figure 1-16 As shown, a pulse column 10 is fixed to the middle of the lower end of the non-magnetic pulse body 9, and the pulse column 10 passes through the first shell 5 and the plunger body 4 in sequence downward and enters the lower shell 2, and the penetrating part of the pulse column 10 can slide up and down. The present invention can limit the non-magnetic pulse body 9 through the plunger body 4, so that it can only vibrate up and down along the axial direction in the first shell 5, which is conducive to improving the accuracy of the pulse signal.

[0057] Specifically, a through hole is opened in the middle of the lower end of the first shell 5, an axial hole is opened in the middle of the plunger body 4, and a limiting hole is opened in the middle of the base of the lower shell 2. After the upper end of the pulse column 10 is fixed on the non-magnetic pulse body 9, its lower end passes through the through hole and the axial hole in turn and enters the limiting hole. The pulse column 10 can slide up and down in the through hole, the axial hole and the limiting hole.

[0058] Furthermore, the inner diameters of the through hole and the axial hole are the same, the inner diameter of the limit hole is larger than the inner diameters of the through hole and the axial hole, and a limit head is fixed at the lower end of the pulse column 10. The outer diameter of the limit head is between the inner diameter of the axial hole and the inner diameter of the limit hole. The limit head can be used to limit the up and down vibration displacement of the non-magnetic pulse body 9, which is beneficial to improve the accuracy of the pulse signal.

[0059] According to an optional embodiment of the present invention, the pulse column 10 is made of the same material as the non-magnetic pulse body 9 and can be integrally formed at the lower end of the non-magnetic pulse body 9 .

[0060] According to a preferred embodiment of the present invention, Figure 1-4 As shown in Figures 9-13, a plurality of step holes penetrating the plunger body 4 are provided at the bottom of the annular connecting groove. The plurality of step holes are evenly arranged around the axial direction of the plunger body 4 and correspond one-to-one with the balancing column 11. The step holes include a large inner diameter hole and a small inner diameter hole. The large inner diameter hole is located above the small inner diameter hole, and the inner diameter of the large inner diameter hole is less than or equal to the groove body width of the annular connecting groove. In addition, guide holes corresponding one-to-one to the step holes are provided on the support platform of the lower shell 2. The inner diameter of the guide holes is connected to the inner diameter of the large inner diameter hole. One end of the balancing column 11 is limited in the large inner diameter hole by a limit block, and the other end passes through the small inner diameter hole and is limited in the guide hole by a limit block.

[0061] According to a preferred embodiment of the present invention, Figure 1-4 As shown in 11-15, a partition 15 is provided at the upper end of the first shell 5, and a buffer hole 20 is opened on the partition 15 to connect the buffer chamber 19 and the first cooling chamber 16. A plurality of first one-way valves 12 are fixed at the lower end of the first shell 5, a plurality of second one-way valves 13 are fixed at the upper end of the second shell 7, and a plurality of one-way connecting pipes 14 are fixed between the top of the third shell 8 and the partition 15. The first one-way valve 12, the second one-way valve 13 and the one-way connecting pipe 14 are uniformly distributed around the axis of the first shell 5, the diameter of the buffer hole 20 is smaller than the diameter of the one-way connecting pipe 14, the first cooling chamber 16 and the second cooling chamber 17 are connected through the first one-way valve 12, the first cooling chamber 16 and the third cooling chamber 18 are connected through the one-way connecting pipe 14, and the second cooling chamber 17 and the third cooling chamber 18 are connected through the second one-way valve 13.

[0062] In practical applications, the first one-way valve 12, the second one-way valve 13 and the one-way connecting pipe 14 can further disperse and weaken the impact energy when encountering external impact. At the same time, the first cooling chamber 16, the second cooling chamber 17 and the third cooling chamber 18 filled with heat-conducting lubricating oil can also effectively absorb and buffer the impact force to ensure the anti-seismic ability of the equipment.

[0063] Furthermore, the multiple one-way connecting pipes 14 enable the heat-conducting lubricating oil to efficiently flow from the third cooling chamber 18 into the first cooling chamber 16, while ensuring that the lubricating oil can only flow in one direction, effectively preventing the influence of reverse impact on the circulation system and improving the lubrication and heat dissipation efficiency.

[0064] Furthermore, the partition 15 not only separates the first cooling chamber 16 from the buffer chamber 19, but also realizes the pressure balance and circulation of heat-conducting lubricating oil therebetween through the buffer hole 20, thereby enhancing the overall stability. In addition, the tight connection between the components and the multi-layer shell design further improve the sealing and protection level of the equipment.

[0065] According to a preferred embodiment of the present invention, the highest liquid level of the thermal lubricating oil in the buffer chamber 19 is no higher than one-third of the buffer chamber 19 at one end close to the partition 15. This design ensures that there is enough space in the buffer chamber 19 to accommodate the gas compressed or expanded due to pressure fluctuations, avoiding liquid overflow under extreme pressure conditions, thereby ensuring the safety of equipment operation.

[0066] According to a preferred embodiment of the present invention, Figure 1-5 As shown in 12-15, the coil 6 is electrically connected to the external device through a wire, the outer end of the coil 6 is covered with an insulating coating, and gaps are left between the multiple wires on the coil 6.

[0067] In actual applications, the heat generated by the coil 6 is conducted to the surrounding components through the insulating coating and the gap structure. At the same time, the circulating thermal lubricating oil absorbs heat when flowing through the outer surface of the coil 6, and then transfers the heat to the third shell 8, and dissipates it to the external environment through the upper shell 1, thereby achieving efficient heat dissipation.

[0068] According to a preferred embodiment of the present invention, Figure 11-17As shown, a plurality of flow guide holes 21 are evenly provided on the non-magnetic pulse body 9 along the axial direction, and the number of the flow guide holes 21 may be 4, and each flow guide hole 21 penetrates the non-magnetic pulse body 9. In addition, the lower end of the flow guide hole 21 is communicated with the first cooling chamber 16, and the heat-conducting lubricating oil in the first cooling chamber 16 can enter the flow guide hole 21. An elastic diaphragm 22 for blocking the flow guide hole 21 is provided at the upper end of the flow guide hole 21, and one side of the elastic diaphragm 22 is fixed to the upper end of the non-magnetic pulse body 9 by bolts. When the pressure of the heat-conducting lubricating oil in the flow guide hole 21 is greater than the elastic force of the elastic diaphragm 22, the elastic diaphragm 22 will be opened, and the heat-conducting lubricating oil in the flow guide hole 21 will flow to the top of the non-magnetic pulse body 9.

[0069] Specifically, when the non-magnetic pulse body 9 vibrates along the axis, the heat-conducting lubricating oil flows from the lower end of the first cooling chamber 16 to the top of the non-magnetic pulse body 9 through the guide hole 21 controlled by the elastic diaphragm 22. When the non-magnetic pulse body 9 moves in the opposite direction, the elastic diaphragm 22 automatically closes the guide hole 21 to prevent the lubricating oil from flowing back. In this process, the heat-conducting lubricating oil is acted upon by the thrust of the non-magnetic pulse body 9, and forms a closed loop under the guidance of the one-way connecting pipe 14, the second one-way valve 13, the second cooling chamber 17 and the first one-way valve 12, thereby ensuring the continuous flow of the lubricating oil and the stability of the internal pressure of the equipment.

[0070] It should be noted that, for ease of assembly and disassembly, the fixation between the upper shell 1 and the lower shell 2, and the fixation between the lower shell 2 and the plunger body 4 are preferably fixed by threads, but any other possible fixing method such as welding, clamping, etc. can also be used.

[0071] The implementation principle of the present invention is: after the pulse generator is assembled, it is placed underground and can be used afterwards. During use, the coil 6 can drive multiple magnets on the non-magnetic pulse body 9 through electromagnetic force, so that the multiple magnets drive the non-magnetic pulse body 9 to vibrate. This vibration causes the non-magnetic pulse body 9 to generate high-frequency reciprocating motion along the axial direction in the first shell 5, thereby forming a pulse signal for geological detection.

[0072] When the pulse generator gradually goes deeper into the well and the external pressure increases, the pressure on the upper shell 1 and the lower shell 2 also gradually increases. At this time, a pressure difference is generated inside and outside the upper shell 1 and the lower shell 2. Under the action of the pressure difference, the pulse column 10 and the balance column 11 both move toward the direction close to the buffer body 3. The pulse column 10 and the multiple balance columns 11 both push the heat-conducting lubricating oil to move, so that the pressure inside the pulse generator also increases synchronously. The specific movement path of the heat-conducting lubricating oil is: the heat-conducting lubricating oil passes through the third cooling chamber 18, the second cooling chamber 17, the first cooling chamber 16 and the buffer hole 20 in turn and enters the buffer chamber 19. The heat-conducting lubricating oil squeezes the gas at the upper end of the buffer chamber 19 in the buffer chamber 19 until the pressure inside the buffer chamber 19 is balanced with the external pressure on the balance column 11. The gas in the buffer chamber 19 is used to buffer the external pressure, and at the same time, the pressure difference between the upper shell 1, the lower shell 2, the buffer body 3, the plunger body 4, the first shell 5, the second shell 7 and the third shell 8 is reduced by balancing the internal and external pressures, thereby realizing the protection of the pulse generator.

[0073] When the pulse generator moves upward from the bottom of the well and the external pressure decreases, the pressure inside the pulse generator also decreases synchronously. At this time, multiple equalizing columns 11 move away from the buffer body 3, and the pressure of the thermal lubricating oil exerted by multiple equalizing columns 11 decreases. At this time, the volume of the compressed gas in the buffer chamber 19 begins to expand, and the thermal lubricating oil flows from the buffer chamber 19 through the buffer hole 20 into the first cooling chamber 16 until the pressure in the buffer chamber 19 is balanced with the external pressure exerted on the equalizing column 11.

[0074] It can be seen that no matter whether the pulse generator is rising or falling, the pressure inside the pulse generator is always balanced with the external pressure.

[0075] In addition, during the operation of the pulse generator, the non-magnetic pulse body 9 vibrates back and forth in the first shell 5 along the axial direction of the first shell 5, and the vibration is transmitted outward through the pulse column 10. During the back and forth vibration of the non-magnetic pulse body 9, the non-magnetic pulse body 9 pushes the heat-conducting lubricating oil in the first shell 5 to circulate in the plunger body 4, the first shell 5, the second shell 7 and the third shell 8. During the circulation process, the heat-conducting lubricating oil transfers the heat generated on the coil 6 from the second shell 7 to the third shell 8, and then the heat is transferred from the third shell 8 to the upper shell 1, and then the heat is dissipated from the upper shell 1 to the surrounding environment, thereby cooling the coil 6.

[0076] Specifically, when the non-magnetic pulse body 9 moves toward the direction close to the lower shell body 2, the heat-conducting lubricating oil at the lower end of the first cooling chamber 16 moves toward the direction close to the buffer body 3 through the guide hole 21. At this time, under the pressure of the heat-conducting lubricating oil, the elastic diaphragm 22 is opened, so that the heat-conducting lubricating oil flows from the bottom end of the elastic diaphragm 22 to the top of the non-magnetic pulse body 9. When the non-magnetic pulse body 9 moves toward the direction close to the buffer body 3, under the pressure of the heat-conducting lubricating oil and the elastic force of the elastic diaphragm 22 itself, the elastic diaphragm 22 automatically closes the top of the guide hole 21. At this time, under the thrust of the non-magnetic pulse body 9, the heat-conducting lubricating oil first flows from the first cooling chamber 16 through multiple one-way connecting pipes 14 into the third cooling chamber 18, and then the heat-conducting lubricating oil flows back to the lower end of the first cooling chamber 16 through the second one-way valve 13, the second cooling chamber 17 and the first one-way valve 12 in turn, realizing a circulating flow.

[0077] During the circulation of the above-mentioned thermal conductive lubricating oil, when the thermal conductive lubricating oil flows through the surface of the coil 6, the heat generated by the coil 6 is taken away. When the thermal conductive lubricating oil flows through the third cooling chamber 18, the heat is transferred from the third shell 8 to the upper shell 1. Then the heat is transferred from the upper shell 1 to the external environment, realizing an effective heat dissipation and cooling function.

[0078] When the upper shell 1 and the lower shell 2 are subjected to external impact, the heat-conducting lubricating oil in the upper shell 1, the third shell 8, the second shell 7, the first shell 5, and the first cooling chamber 16, the second cooling chamber 17 and the third cooling chamber 18 can weaken the external impact multiple times, thereby achieving the buffering and absorption of the external impact. At the same time, the non-magnetic pulse body 9 and the pulse column 10 can slide back and forth in the first shell 5, and can also buffer and absorb the external impact to a certain extent. In this process, the heat-conducting lubricating oil in the first cooling chamber 16 can also buffer and absorb the external impact to a certain extent, thereby achieving the buffering and absorption of the external impact, thereby improving the anti-seismic ability of the pulse generator. In addition, when the upper shell 1, the third shell 8, the second shell 7 and the first shell 5 are deformed by the impact and squeeze the heat-conducting lubricating oil inside, multiple balancing columns 11 will move back and forth in the plunger body 4, thereby further improving the anti-seismic ability of the pulse generator.

[0079] In summary, the present invention generates high-efficiency pulse signals by optimizing the internal magnet vibration structure, and can cope with pressure changes in complex underground environments through pressure balance and buffering. It uses heat-conducting lubricating oil to dynamically adjust the internal pressure to protect the shell structure, and uses circulating lubricating oil to efficiently dissipate heat to ensure high-temperature and stable operation of the equipment. Multiple anti-seismic designs are used to enhance the impact resistance of the equipment, and the device is compactly integrated to improve space utilization and energy transfer efficiency. At the same time, a regulating valve 23 is provided to achieve dynamic pressure regulation and safe operation. Through the integrated design of a one-way valve, a cooling chamber, etc., pressure fluctuations and temperatures are effectively controlled and good lubrication is provided, ensuring stability and reliability in operation under various extreme conditions.

[0080] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other alternative features that are equivalent or have similar purposes; all the disclosed features, or all the steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A high-frequency pulse generator for underground use, characterized in that: The invention comprises an upper shell (1), a buffer body (3) is fixed to the upper part of the upper shell (1), a buffer chamber (19) is provided at the lower end of the buffer body (3), and a regulating valve (23) communicating with the buffer chamber (19) is provided at the upper end of the buffer body (3); a lower shell (2) is fixed to the lower end of the upper shell (1), a plunger body (4) extending into the upper shell (1) is fixed to the upper part of the lower shell (2), an annular communication groove is provided at the upper end of the plunger body (4), and a plurality of axially slidable balancing columns (11) are evenly arranged at the bottom of the annular communication groove; a cooling buffer device and an electromagnetic pulse vibration device are provided between the plunger body (4) and the buffer body (3), wherein: The cooling buffer device comprises a first shell (5), a second shell (7) and a third shell (8) which are fixedly sleeved in sequence from the inside to the outside; a first cooling chamber (16) which is communicated with the buffer chamber (19) is provided in the first shell (5); a second cooling chamber (17) is provided between the first shell (5) and the second shell (7); a third cooling chamber (18) which is communicated with the annular connecting groove is provided between the second shell (7) and the third shell (8); the first cooling chamber (16), the second cooling chamber (17) and the third cooling chamber (18) are communicated with each other in sequence; and the first cooling chamber (16), the second cooling chamber (17), the third cooling chamber (18), the annular connecting groove and the buffer chamber (19) are all filled with heat-conducting lubricating oil; The electromagnetic pulse vibration device comprises a coil (6), a magnet and a non-magnetic pulse body (9); the non-magnetic pulse body (9) is movably arranged in a first cooling chamber (16), and the magnet is evenly fixed on the non-magnetic pulse body (9); the coil (6) is located in a second cooling chamber (17) and is fixedly sleeved on a first shell (5); the coil (6) cooperates with the magnet to make the non-magnetic pulse body (9) vibrate up and down along the axial direction of the first shell (5).

2. A downhole high-frequency pulse generator according to claim 1, characterized in that: A pulse column (10) is fixed to the lower end of the non-magnetic pulse body (9); the pulse column (10) sequentially penetrates the first shell (5) and the plunger body (4) downwards and enters the lower shell (2); and the penetrated portion of the pulse column (10) can slide up and down.

3. A downhole high-frequency pulse generator according to claim 1, characterized in that: A stepped hole penetrating the plunger body (4) is provided at the bottom of the annular connecting groove, the stepped hole comprising a large inner diameter hole and a small inner diameter hole, a guide hole corresponding to the stepped hole is provided in the lower shell (2), one end of the balancing column (11) is limited in the large inner diameter hole, and the other end passes through the small inner diameter hole and is limited in the guide hole.

4. A downhole high-frequency pulse generator according to claim 1, characterized in that: A partition (15) is provided at the upper end of the first shell (5), and a buffer hole (20) is provided on the partition (15) for connecting the buffer chamber (19) and the first cooling chamber (16); a plurality of first one-way valves (12) are fixed at the lower end of the first shell (5), a plurality of second one-way valves (13) are fixed at the upper end of the second shell (7), a plurality of one-way connecting pipes (14) are fixed between the top of the third shell (8) and the partition (15), the first cooling chamber (16) and the second cooling chamber (17) are connected via the first one-way valve (12), the first cooling chamber (16) and the third cooling chamber (18) are connected via the one-way connecting pipe (14), and the second cooling chamber (17) and the third cooling chamber (18) are connected via the second one-way valve (13).

5. A downhole high frequency pulse generator according to claim 4, characterized in that: The diameter of the buffer hole (20) is smaller than the diameter of the one-way connecting tube (14).

6. A downhole high frequency pulse generator according to claim 4, characterized in that: The first one-way valve (12), the second one-way valve (13) and the one-way connecting pipe (14) are uniformly distributed around the axis of the first shell (5).

7. A downhole high-frequency pulse generator according to claim 4, characterized in that: The highest liquid level of the heat-conducting lubricating oil in the buffer chamber (19) is no higher than one-third of the buffer chamber (19) at one end close to the partition (15).

8. A downhole high-frequency pulse generator according to any one of claims 1 to 7, characterized in that: The non-magnetic pulse body (9) is evenly provided with a plurality of guide holes (21) along the axial direction, an elastic diaphragm (22) for sealing the guide holes (21) is fixed to the upper ends of the guide holes (21) by bolts, and the lower ends of the guide holes (21) are in communication with the first cooling chamber (16).

9. The underground high-frequency pulse generator according to claim 1, characterized in that: The coil (6) is electrically connected to an external device via a wire, the outer end of the coil (6) is coated with an insulating coating, and gaps are left between the multiple wires on the coil (6).

10. The underground high-frequency pulse generator according to claim 1, characterized in that: The buffer body (3) comprises an upper threaded section and a lower conical section which are integrally formed; the buffer chamber (19) is opened from the lower end surface of the lower conical section in the direction of the upper threaded section; the regulating valve (23) is fixed on the upper threaded section; and the upper shell (1) is provided with an internal threaded section and a conical surface which correspond to the upper threaded section and the lower conical section respectively.

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