CN118944637B - A high frequency pulse generator for underground use - Google Patents

Abstract

The invention discloses an underground high-frequency pulse generator, 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 two ends of the upper shell, a buffer chamber is arranged at the lower end of the buffer body, an adjusting valve is arranged at the upper end of the buffer body, a plunger body extending into the upper shell is fixed at the upper part of the lower shell, an annular communicating groove is arranged at the upper end of the plunger body, a plurality of axially slidable equalizing columns are uniformly arranged at the bottom of the annular communicating groove, and a cooling buffer device and an electromagnetic pulse vibration device are arranged between the plunger body and the buffer body. The invention has good anti-seismic performance, effective heat dissipation and cooling performance and intelligent pressure regulation and control function, can adapt to and resist potential damage to equipment caused by extreme conditions such as underground high pressure, high temperature, impact and corrosion, can stably and efficiently work even in a complex environment of a deep well, and solves the technical problem that the conventional device is difficult to ensure long-term reliable operation in the high pressure, high temperature, strong impact and corrosion environment.

Description

Underground high-frequency pulse generator

Technical Field

The invention relates to the technical field of underground logging equipment, in particular to an underground high-frequency pulse generator.

Background

In the field of petroleum and natural gas exploration, an underground high-frequency pulse generator is core equipment of an important geological detection method such as electrical logging, and the like, and the existing underground high-frequency pulse generator often faces the problems of poor pressure adaptability, poor heat dissipation effect, weak anti-seismic performance, insufficient sealing performance and the like, so that the capability of long-term stable operation of the existing underground high-frequency pulse generator in a deep well complex environment is limited.

The patent document of Chinese patent publication No. CN115898383A discloses an underground pulse signal generating device, which comprises a non-magnetic drill collar, wherein a connecting shaft is arranged in the non-magnetic drill collar, a generating unit and a driving unit are sequentially arranged on the connecting shaft, the generating unit comprises a rotor, a modulation stator and a modulation rotor which are sequentially arranged, the rotor is configured to be capable of rotating relative to the connecting shaft and not capable of moving, the modulation stator is configured to be fixed in the generating unit and not capable of rotating and moving relative to the connecting shaft, and the modulation rotor is configured to be capable of moving relative to the connecting shaft and not capable of rotating. The driving unit includes an exciting module disposed adjacent to the modulation mover, and a motor for driving the connection shaft to rotate. The modulation mover is configured to move toward or away from the modulation stator under the influence of the excitation module, thereby changing the flow area of fluid flowing through the non-magnetic drill collar to generate a pulse signal.

The pulse signal generating device generates a pulse signal by utilizing the change of the fluid flow area and combines the interaction of a motor drive and a magnetic element to realize generation and transmission of the underground pulse signal, but the underground pulse signal generating device still has certain limitations through careful analysis, such as certain defects when dealing with extreme conditions in a deep well environment, particularly the defects in the aspects of device stability, shock resistance, heat dissipation cooling efficiency and pressure regulation, which cause difficulty in ensuring long-term reliable operation in high-pressure, high-temperature, strong-impact and corrosive environments.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide the underground high-frequency pulse generator which has good anti-seismic performance, effective heat dissipation and cooling performance and intelligent pressure regulation and control function, can adapt to and resist potential damage to equipment caused by extreme conditions such as underground high pressure, high temperature, impact and corrosion, can stably and efficiently work even in a deep well complex environment, and solves the technical problem that the conventional device is difficult to ensure long-term reliable operation in the high pressure, high temperature, strong impact and corrosion environments.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

The underground high-frequency pulse generator comprises an upper shell, wherein a buffer body is fixed at the upper part in the upper shell, a buffer chamber is arranged at the lower end of the buffer body, an adjusting valve communicated with the buffer chamber is arranged at the upper end of the buffer body, a lower shell is fixed at the lower end of the upper shell, a plunger body extending into the upper shell is fixed at the upper part of the lower shell, an annular communicating groove is arranged at the upper end of the plunger body, a plurality of axially sliding equalizing columns are uniformly arranged at the bottom of the annular communicating groove, a cooling buffer device and an electromagnetic pulse vibration device are arranged between the plunger body and the buffer body,

The cooling buffer device comprises a first shell, a second shell and a third shell which are fixedly sleeved in sequence from inside to outside, wherein a first cooling chamber 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 communicated with the annular communication 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 heat-conducting lubricating oil is filled in the first cooling chamber, the second cooling chamber, the third cooling chamber and the annular communication groove;

The electromagnetic pulse vibration device comprises a coil, a magnet and a non-magnetic pulse body, wherein the non-magnetic pulse body is movably arranged in a first cooling chamber, the magnet is uniformly fixed on the non-magnetic pulse body, the coil is positioned in a second cooling chamber and fixedly sleeved on a first shell, and the coil and the magnet are matched to enable the non-magnetic pulse body to vibrate up and down along the axial direction of the first shell.

The lower end of the non-magnetic pulse body is fixedly provided with a pulse column, the pulse column penetrates through the first shell and the plunger body downwards in sequence and then enters the lower shell, and the penetrating part of the pulse column can slide up and down.

The annular communicating groove bottom is provided with a step hole penetrating through the plunger body, the step hole comprises a large-inner-diameter hole and a small-inner-diameter hole, the lower shell is internally provided with guide holes corresponding to the step holes one by one, one end of the equalizing column is limited in the large-inner-diameter hole, and the other end of the equalizing column penetrates through the small-inner-diameter hole and then is limited in the guide holes.

The upper end of the first shell is provided with a baffle plate, a buffer hole for communicating the buffer chamber with the first cooling chamber is formed in the baffle plate, a plurality of first one-way valves are fixed at the lower end of the first shell, a plurality of second one-way valves are fixed at the upper end of the second shell, a plurality of one-way communicating pipes are fixed between the top of the third shell and the baffle plate, the first cooling chamber is communicated with the second cooling chamber through the first one-way valves, the first cooling chamber is communicated with the third cooling chamber through the one-way communicating pipes, and the second cooling chamber is communicated with the third cooling chamber through the second one-way valves.

The diameter of the buffer hole is smaller than that of the one-way communicating pipe.

The first one-way valve, the second one-way valve and the one-way communicating pipe are uniformly distributed around the axis of the first shell.

The highest liquid level of the heat conduction lubricating oil in the buffer chamber is not higher than one third of the position, close to one end of the partition plate, of the buffer chamber.

The non-magnetic pulse body is uniformly provided with a plurality of diversion holes along the axial direction, the upper ends of the diversion holes are fixed with elastic diaphragms for blocking the diversion holes through bolts, and the lower ends of the diversion holes are communicated with the first cooling chamber.

The coil is electrically connected with external equipment through wires, an insulating coating is coated at the outer end of the coil, and gaps are reserved among a plurality of wires on the coil.

The buffer body comprises an upper threaded section and a lower conical section which are integrally formed, the buffer chamber is arranged in the direction of the upper threaded section from the lower end face of the lower conical section, the regulating valve is fixed on the upper threaded section, and the upper shell is internally provided with an inner threaded section and a conical surface which respectively correspond to the upper threaded section and the lower conical section.

The invention has the advantages that:

1. the pulse generator has the advantages of excellent anti-seismic performance, the whole pulse generator structurally adopts a multi-layer shell structure, a buffer body and heat conduction lubricating oil are combined to form a multiple buffer absorption link, when external impact is received, the buffer body between the upper shell and the lower shell and the heat conduction lubricating oil can effectively weaken impact energy, and the non-magnetic pulse body and the pulse column in the first shell can also have a certain buffer effect in the elastic deformation in the sliding process. In addition, a plurality of equalization columns uniformly distributed around the pulse column also generate tiny vibration when being stressed, so that the overall shock resistance of the device is enhanced. Due to the design of the buffer body and the heat-conducting lubricating oil, the pulse generator can adapt to underground pressure fluctuation in the working process, and keeps internal and external pressure balance through dynamic adjustment of the structure of the pulse generator, so that the pulse generator is not only beneficial to reducing equipment damage caused by pressure difference, but also improves the stability and durability of long-term operation of the pulse generator.

2. When the upper shell, the third shell, the second shell and the first shell are deformed due to external impact, the internal heat conduction lubricating oil correspondingly flows or extrudes under the pressure action of the deformation of the shells, and the dynamic response mechanism enables a plurality of balance columns to move back and forth in the plunger body slightly according to the pressure change, so that part of impact energy is absorbed and dispersed, the impact force is transmitted through a liquid medium, the stress concentration effect can be effectively reduced, the impact force directly applied to all parts in the equipment is reduced, and a good buffer effect is achieved. Meanwhile, the continuous lubricating layer formed by the heat conduction lubricating oil among all the parts can also reduce friction resistance, avoid the problem of clamping stagnation or abrasion caused by impact, and further improve the integral anti-vibration performance and the service life of the pulse generator.

3. The invention also has the advantages of excellent sealing performance and space utilization rate, and the tight connection and screw thread fit design between the upper shell and the lower shell and between the components enhances the sealing performance of the whole device, effectively prevents drilling fluid or other underground fluid from entering the interior, and protects the internal precise electronic elements from corrosion damage. By integrating the key components such as the coil, the magnet, the vibration mechanism, the heat radiation system and the like into one compact and interactive unit, the assembly process is simplified, the maintenance difficulty is reduced, the space utilization rate is improved, and the device is more suitable for being used in a narrow underground environment.

4. The invention also has the advantages of improving the energy transmission efficiency and optimizing the signal quality, the sliding connection mode ensures that the vibration energy is efficiently transmitted from the nonmagnetic pulse body to the stratum, and the existence of the equalization column is beneficial to the uniform dispersion of the heat conduction lubricating oil and the energy transmission, thereby improving the quality of the detection signal.

5. The invention also has the advantages of high-efficiency operation and good protection, and enables the pulse generator to realize stable generation of high-frequency pulse signals in the underground environment through an electromagnetic driving and pressure balancing mechanism, effectively adapts to pressure change in a deep well, reduces the risk of equipment damage caused by pressure difference, and improves the stability and durability of long-term operation of equipment.

6. The integrated vibration mechanism, the coil and the heat dissipation system cooperate to ensure that heat is rapidly transferred from a heating part to the upper shell and dissipated through the environment, realize high-efficiency heat dissipation and ensure the stable operation of the pulse generator under high-power operation.

7. The invention also has the advantages of fine pressure regulation and buffering, when the external pressure changes, the balance column can flow in the shell in cooperation with the heat-conducting lubricating oil to regulate the pressure, so that the balance of the internal pressure and the external pressure is achieved, and meanwhile, the buffer chamber can be designed to buffer and protect the external pressure, so that the pressure stability of the system is maintained.

8. The invention also has the advantages of intelligent pressure regulation and safety protection, and the internal pressure can be regulated according to different depths or complex stratum conditions through the regulating valve at the top of the buffer body, so that the pressure balance of the whole system is ensured, and the heat conduction lubricating oil liquid level control in the buffer chamber ensures that the equipment can still operate safely under extreme pressure conditions.

9. In summary, the invention has good anti-seismic performance, effective heat dissipation and cooling performance, intelligent pressure regulation and control function and the like, can adapt to and resist potential damage to equipment caused by extreme conditions such as underground high pressure, high temperature, impact and corrosion, and can ensure that the pulse generator can reliably operate for a long time under the high pressure, high temperature, strong impact and corrosion environments even in the complex environment of a deep well.

Drawings

FIG. 1 is a cross-sectional (front) view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of the overall structure of the present invention;

FIG. 3 is a front view of the present invention;

FIG. 4 is a cross-sectional view A-A of the present invention;

FIG. 5 is a B-B cross-sectional view of the present invention;

FIG. 6 is a C-C cross-sectional view of the present invention;

FIG. 7 is a D-D cross-sectional view of the present invention;

FIG. 8 is a cross-sectional E-E view of the present invention;

FIG. 9 is a cross-sectional F-F view of the present invention;

FIG. 10 is an enlarged view of the present invention at G;

FIG. 11 is an exploded view of the present invention;

FIG. 12 is a second exploded view of the present invention;

FIG. 13 is an exploded view III of the present invention;

FIG. 14 is an exploded view of the present invention;

FIG. 15 is an exploded view of the present invention;

FIG. 16 is an exploded view of the present invention;

Fig. 17 is an enlarged view at H of the present invention.

The drawing is marked as 1, upper shell; 2, a lower shell, 3, a buffer body, 4, a plunger body, 5, a first shell, 6, a coil, 7, a second shell, 8, a third shell, 9, a non-magnetic pulse body, 10, a pulse column, 11, a balance column, 12, a first one-way valve, 13, a second one-way valve, 14, a one-way communicating pipe, 15, a partition plate, 16, a first cooling chamber, 17, a second cooling chamber, 18, a third cooling chamber, 19, a buffer chamber, 20, a buffer hole, 21, a diversion hole, 22, an elastic membrane, 23 and a regulating valve.

Detailed Description

As shown in fig. 1 to 17, a high frequency pulse generator for downhole use comprises an upper housing 1, wherein,

The upper shell 1 is of a hollow structure, the upper part of the upper shell 1 is a diameter-changing section with the inner diameter sequentially increased, the lower part of the upper shell 1 is a diameter section, a buffer body 3 is fixed on the upper part in the upper shell 1, a buffer chamber 19 is arranged at the lower end of the buffer body 3, and an adjusting valve 23 communicated with the buffer chamber 19 is arranged at the upper end of the buffer body 3.

The lower extreme of going up casing 1 is fixed with casing 2 down, is equipped with the cushion cap in the casing 2 down, and the upper portion of casing 2 down passes through cushion cap fixed plunger body 4, and the upper end of plunger body 4 upwards stretches into in the casing 1, and the external diameter of plunger body 4 and the internal diameter looks adaptation of casing 2 lower extreme down. In addition, the upper end of the plunger body 4 is provided with an annular communication groove, the axis of the annular communication groove coincides with the axis of the plunger body 4, and a plurality of balancing columns 11 capable of axially sliding are uniformly arranged at the bottom of the annular communication groove.

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

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 inside to outside, wherein the first shell 5 can be fixedly sleeved between the buffer body 3 and the plunger body 4 in a butt joint manner, the second shell 7 is fixedly sleeved on the first shell 5, the outer diameter of the third shell 8 is matched with the inner diameter of the middle lower part of the upper shell 1, the third shell 8 can be fixedly sleeved between the buffer body 3 and the plunger body 4 in a butt joint manner, the third shell 8 can be fixedly sleeved on the second shell 7, and after the third shell 8 is fixedly sleeved between the buffer body 3 and the outer side wall of the annular communication groove. In addition, a first cooling chamber 16 communicated with a buffer chamber 19 is arranged in the first shell 5, a second cooling chamber 17 is arranged between the first shell 5 and the second shell 7, a third cooling chamber 18 communicated with an annular communication groove is arranged 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 heat-conducting lubricating oil is filled in the first cooling chamber 16, the second cooling chamber 17, the third cooling chamber 18, the annular communication groove and the buffer chamber 19.

The electromagnetic pulse vibration device comprises a coil 6, a magnet and a non-magnetic pulse body 9, wherein the non-magnetic pulse body 9 is preferably of a cylindrical structure and is movably arranged in a first cooling chamber 16. The magnets are uniformly fixed on the non-magnetic pulse body 9 in a cementing or clamping way. The coil 6 is located in the second cooling chamber 17 and is fixedly sleeved on the first housing 5, the coil 6 is electrically connected with external equipment through a wire, electromagnetic force can be generated after the coil 6 is electrified, the coil can be matched with a magnet under the action of the electromagnetic force to enable the nonmagnetic pulse body 9 to vibrate up and down along the axial direction of the first housing 5, and the nonmagnetic pulse body 9 generates high-frequency reciprocating motion in the first housing 5 along the axial direction due to the vibration, so that a pulse signal for geological detection is formed.

When the nonmagnetic pulse body 9 vibrates up and down in the first housing 5, the equalization columns 11 generate slight vibration to some extent according to the change of the pressure of the heat conduction lubricating oil, so as to buffer and balance the moving impact of the nonmagnetic pulse body 9.

According to a preferred embodiment of the present invention, as shown in fig. 1 to 4, 9 and 11, the buffer body 3 includes an integrally formed upper thread section and lower tapered section, the variable diameter section of the upper housing 1 is respectively provided with an internal thread section and a tapered surface corresponding to the upper thread section and the lower tapered section, respectively, the buffer body 3 is fixed in the upper housing 1 through the upper thread section and the internal thread section, and the lower tapered section of the buffer body 3 just abuts against the tapered surface of the upper housing 1 after the buffer body 3 is fixed in the upper housing 1.

In addition, the buffer chamber 19 is opened from the middle of the lower end surface of the lower tapered section toward the upper thread section and extends to the lower end of the upper thread section. The regulating valve 23 is fixed in the middle of the upper end of the upper thread section and is communicated with external equipment through a pipeline. The pressure in the buffer chamber 19 can be regulated by matching the buffer chamber 19 with the regulating valve 23, so that the working requirements under different depths or complex stratum conditions can be met, and the pressure balance and stability of the whole system can be maintained.

According to a preferred embodiment of the present invention, as shown in fig. 1 to 16, a pulse post 10 is fixed at the middle of the lower end of the non-magnetic pulse body 9, the pulse post 10 penetrates the first housing 5 and the plunger body 4 in sequence downward and then enters the lower housing 2, and the penetrating part of the pulse post 10 can slide up and down. According to the invention, the non-magnetic pulse body 9 can be limited through the plunger body 4, so that the non-magnetic pulse body can only vibrate up and down in the axial direction in the first shell 5, and the accuracy of pulse signals is improved.

Specifically, the through hole is formed in the middle of the lower end of the first shell 5, the shaft center hole is formed in the middle of the plunger body 4, the limit hole is formed in the middle of the bearing platform of the lower shell 2, the upper end of the pulse column 10 is fixed on the non-magnetic pulse body 9, the lower end of the pulse column sequentially passes through the through hole and the shaft center hole and then enters the limit hole, and the pulse column 10 can slide up and down in the through hole, the shaft center hole and the limit hole.

Further, the inner diameters of the through hole and the axle center hole are the same, the inner diameter of the limit hole is larger than the inner diameters of the through hole and the axle center hole, the lower end of the pulse column 10 is fixedly provided with a limit head, the outer diameter of the limit head is positioned between the inner diameter of the axle center hole and the inner diameter of the limit hole, the limit head can limit the up-and-down vibration displacement of the nonmagnetic pulse body 9, and the accuracy of pulse signals is improved.

According to an alternative embodiment of the present invention, the pulse post 10 is made of the same material as the non-magnetic pulse body 9, and may be integrally formed at the lower end of the non-magnetic pulse body 9.

According to a preferred embodiment of the present invention, as shown in fig. 1-4 and 9-13, a plurality of stepped holes penetrating the plunger body 4 are formed at the bottom of the annular communicating groove, and the stepped holes are uniformly arranged around the axial direction of the plunger body 4 and are in one-to-one correspondence with the equalizing columns 11. The step hole comprises a large inner diameter hole and a small inner diameter hole, the large inner diameter hole is positioned above the small inner diameter hole, and the inner diameter of the large inner diameter hole is smaller than or equal to the width of the groove body of the annular communication groove. In addition, the bearing platform of the lower shell 2 is provided with guide holes corresponding to the step holes one by one, the inner diameter of each guide hole is communicated with the inner diameter of the corresponding large-inner-diameter hole, one end of each balance column 11 is limited in the corresponding large-inner-diameter hole through a limiting block, and the other end of each balance column passes through the corresponding small-inner-diameter hole and is limited in each guide hole through the corresponding limiting block.

According to a preferred embodiment of the present invention, as shown in fig. 1-4 and 11-15, a partition 15 is provided at the upper end of the first housing 5, and a buffer hole 20 for communicating the buffer chamber 19 with the first cooling chamber 16 is provided in the partition 15. The lower extreme of first casing 5 is fixed with a plurality of first check valves 12, the upper end of second casing 7 is fixed with a plurality of second check valves 13, be fixed with a plurality of one-way communicating pipes 14 between the top of third casing 8 and baffle 15, first check valves 12, second check valves 13 and one-way communicating pipes 14 all evenly distributed around first casing 5 axis, the diameter of buffer hole 20 is less than the diameter of one-way communicating pipe 14, communicate through first check valve 12 between first cooling chamber 16 and the second cooling chamber 17, communicate through one-way communicating pipe 14 between first cooling chamber 16 and the third cooling chamber 18, communicate through second check valve 13 between second cooling chamber 17 and the third cooling chamber 18.

In practical application, the first check valve 12, the second check valve 13 and the one-way communication pipe 14 can play a role of further dispersing and weakening 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 impact force, and ensure the shock resistance of the equipment.

Further, the plurality of one-way communication pipes 14 enable the heat-conductive lubricant to efficiently flow from the third cooling chamber 18 into the first cooling chamber 16 while ensuring that the lubricant can flow only in one direction, effectively preventing the influence of reverse impact on the circulation system and improving the lubrication and heat dissipation efficiency.

Furthermore, the partition 15 not only separates the first cooling chamber 16 from the buffer chamber 19, but also realizes pressure balance and heat conduction lubricating oil circulation of the first cooling chamber and the buffer chamber through the buffer holes 20, so that the overall stability is enhanced, and the sealing performance and the protection level of the equipment are further improved by matching with the tight connection between the components and the design of the multi-layer shell.

According to a preferred embodiment of the invention, the highest level of the heat-conducting lubricating oil in the buffer chamber 19 is not higher than one third of the buffer chamber 19 near the end of the partition 15, and the design ensures that there is enough space in the buffer chamber 19 to accommodate the gas compressed or expanded due to pressure fluctuation, avoiding liquid overflow under extreme pressure conditions, thereby ensuring the safety of the operation of the device.

According to a preferred embodiment of the present invention, as shown in fig. 1-5 and 12-15, the coil 6 is electrically connected to an external device through wires, the outer end of the coil 6 is coated with an insulating coating, and gaps are left between the wires on the coil 6.

In practical application, heat generated by the coil 6 is thermally conducted to surrounding components through the covered insulating coating and the gap structure, and meanwhile, the circularly flowing heat conducting lubricating oil absorbs heat when flowing through the outer surface of the coil 6, and then the heat is transferred to the third shell 8 and is emitted to the external environment through the upper shell 1, so that efficient heat dissipation is realized.

According to a preferred embodiment of the present invention, as shown in fig. 11-17, a plurality of flow guiding holes 21 are uniformly formed in the non-magnetic pulse body 9 along the axial direction, and the number of the flow guiding holes 21 may be 4, and each flow guiding hole 21 penetrates through the non-magnetic pulse body 9. In addition, the lower end of the deflector hole 21 communicates with the first cooling chamber 16, and the heat conductive lubricant in the first cooling chamber 16 can enter the deflector hole 21. An elastic membrane 22 for blocking the deflector hole 21 is arranged at the upper end of the deflector hole 21, and one side of the elastic membrane 22 is fixed at the upper end of the non-magnetic pulse body 9 through a bolt. When the pressure of the heat conduction lubricating oil in the diversion hole 21 is larger than the elastic force of the elastic membrane 22, the elastic membrane 22 is opened, and the heat conduction lubricating oil in the diversion hole 21 flows to the top end of the nonmagnetic pulse body 9.

Specifically, when the non-magnetic pulse body 9 vibrates along the axis, the heat conduction lubricating oil flows from the lower end of the first cooling chamber 16 to the top end of the non-magnetic pulse body 9 through the diversion hole 21 controlled by the elastic membrane 22, and when the non-magnetic pulse body 9 moves reversely, the elastic membrane 22 automatically closes the diversion hole 21 to prevent the lubricating oil from flowing back. In the process, the heat conduction lubricating oil is subjected to the thrust force of the non-magnetic pulse body 9, and forms a closed cycle under the guidance of the unidirectional communicating pipe 14, the second unidirectional valve 13, the second cooling chamber 17 and the first unidirectional valve 12, so that the continuous flow of the lubricating oil and the stability of the internal pressure of the equipment are ensured.

For easy assembly and disassembly, the upper case 1 and the lower case 2, the lower case 2 and the plunger body 4 are preferably fixed by screw threads, but any other possible fixing methods such as welding, fastening, etc. may be used.

The invention has the implementation principle that the pulse generator is assembled and then put into the well, and then the pulse generator can be started to be used, and when the pulse generator is used, the coil 6 can drive a plurality of magnets on the nonmagnetic pulse body 9 through electromagnetic force, so that the plurality of magnets drive the nonmagnetic pulse body 9 to vibrate, and the nonmagnetic pulse body 9 generates high-frequency reciprocating motion along the axial direction in the first shell 5 by the vibration, so that a pulse signal for geological detection is formed.

When the pulse generator gradually goes deep into the underground external pressure to increase, the pressure born by the upper shell 1 and the lower shell 2 also gradually increases, at the moment, the pressure difference is generated between the inside and the outside of the upper shell 1 and the lower shell 2, under the action of the pressure difference, the pulse column 10 and the equalization columns 11 move towards the direction close to the buffer body 3, and the pulse column 10 and the equalization columns 11 push the heat conduction lubricating oil to move, so that the pressure inside the pulse generator also synchronously increases. The specific moving path of the heat conduction lubricating oil is that the heat conduction lubricating oil sequentially passes through the third cooling chamber 18, the second cooling chamber 17, the first cooling chamber 16 and the buffer chamber 20 and enters the buffer chamber 19, and the heat conduction lubricating oil presses 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 born by the equalizing column 11. The external pressure is buffered by the gas in the buffer chamber 19, and the pressure difference born by 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 the balance of the internal pressure and the external pressure, so that the protection of the pulse generator is realized.

When the external pressure decreases when the pulser moves upwards from the bottom of the well, the pressure in the pulser also decreases synchronously, at this time, the equalization columns 11 move away from the buffer body 3, the pressure of the equalization columns 11 on the heat-conducting lubricating oil decreases, at this time, the volume of the compressed gas in the buffer chamber 19 begins to expand, and the heat-conducting lubricating oil flows from the buffer chamber 19 into the first cooling chamber 16 through the buffer hole 20 until the pressure in the buffer chamber 19 is balanced with the external pressure received by the equalization columns 11.

It follows that the pressure within the pulse generator is always in equilibrium with the external pressure, whether the pulse generator is rising or falling.

In addition, in the working process 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, vibration is transmitted outwards through the pulse column 10, in the process of vibrating the non-magnetic pulse body 9 back and forth, the non-magnetic pulse body 9 pushes heat conduction lubricating oil in the first shell 5 to circularly flow in the plunger body 4, the first shell 5, the second shell 7 and the third shell 8, heat generated by the coil 6 is transmitted into the third shell 8 from the second shell 7 in the process of circularly flowing, then the heat is transmitted to the upper shell 1 from the third shell 8, and then the heat is emitted to the surrounding environment from the upper shell 1, so that the temperature reduction of the coil 6 is realized.

Specifically, when the non-magnetic pulse body 9 moves in a direction approaching the lower housing 2, the heat conduction lubricating oil at the lower end of the first cooling chamber 16 moves in a direction approaching the buffer body 3 through the diversion holes 21, at this time, under the pressure effect of the heat conduction lubricating oil, the elastic membrane 22 is opened to enable the heat conduction lubricating oil to flow from the bottom end of the elastic membrane 22 to the top end of the non-magnetic pulse body 9, when the non-magnetic pulse body 9 moves in a direction approaching the buffer body 3, under the pressure of the heat conduction lubricating oil and the elastic force of the elastic membrane 22, the top end of the diversion holes 21 is automatically sealed by the elastic membrane 22, at this time, the heat conduction lubricating oil flows into the third cooling chamber 18 from the first cooling chamber 16 through the plurality of unidirectional communicating pipes 14 under the thrust effect of the non-magnetic pulse body 9, and then the heat conduction lubricating oil flows back to the lower end of the first cooling chamber 16 through the second unidirectional valve 13, the second cooling chamber 17 and the first unidirectional valve 12 in sequence, so as to realize the circulation flow.

In the process of circulating the heat-conducting lubricating oil, when the heat-conducting lubricating oil flows through the outer surface of the coil 6, heat generated by the coil 6 is taken away, and when the heat-conducting lubricating oil flows through the third cooling chamber 18, the heat is transferred from the third shell 8 to the upper shell 1, and then the heat is transferred from the upper shell 1 to the external environment, so that an effective heat dissipation and cooling function is realized.

When the upper case 1 and the lower case 2 are subjected to external impact, the heat conductive lubricant in the upper case 1, the third case 8, the second case 7, the first case 5, and the first cooling chamber 16, the second cooling chamber 17, and the third cooling chamber 18 can attenuate the external impact a plurality of times, thereby achieving buffering and absorption of the external impact. Meanwhile, the non-magnetic pulse body 9 and the pulse column 10 can slide back and forth in the first shell 5, and also can buffer and absorb external impact to a certain extent, and in the process, the heat-conducting lubricating oil in the first cooling chamber 16 can buffer and absorb external impact to a certain extent, so that the buffering and absorbing of the external impact are realized, and the shock resistance of the pulse generator is improved. In addition, when the upper case 1, the third case 8, the second case 7 and the first case 5 are deformed by impact and squeeze the heat conductive lubricant therein, the plurality of balance columns 11 will move back and forth in the plunger body 4, so that the shock resistance of the pulser can be further improved.

In summary, the invention generates high-efficiency pulse signals by optimizing the vibration structure of the internal magnet, can cope with pressure changes in complex underground environment through pressure balance and buffering, utilizes heat-conducting lubricating oil to dynamically adjust internal pressure so as to protect the shell structure, and ensures high-temperature stable operation of equipment by means of efficient heat dissipation of circulating lubricating oil. And the shock resistance of the equipment is enhanced by adopting a multiple shock-resistant design, the device is compact and integrated, the space utilization rate and the energy transfer efficiency are improved, meanwhile, the dynamic pressure regulation and safe operation are realized by the aid of the regulating valve 23, and the pressure fluctuation and the temperature are effectively controlled and good lubrication is provided through the integrated design of the one-way valve, the cooling chamber and the like, so that the stability and the reliability of working under various extreme conditions are ensured.

In the foregoing description, only the specific embodiments of the invention have been described, and any features disclosed in this specification may be substituted for other equivalent or similar purpose, or all of the features disclosed, or all of the steps in a method or process may be combined in any manner except for mutually exclusive features and/or steps, unless specifically stated.

Claims (10)

1. A high-frequency pulse generator for underground use is characterized by comprising an upper shell (1), wherein a buffer body (3) is fixed at the upper part in the upper shell (1), a buffer chamber (19) is arranged at the lower end of the buffer body (3), an adjusting valve (23) communicated with the buffer chamber (19) is arranged at the upper end of the buffer body (3), a lower shell (2) is fixed at the lower end of the upper shell (1), a plunger body (4) extending into the upper shell (1) is fixed at the upper part of the lower shell (2), an annular communication groove is arranged at the upper end of the plunger body (4), a plurality of axially slidable equalizing columns (11) are uniformly arranged at the bottom of the annular communication groove, a cooling buffer device and an electromagnetic pulse vibration device are arranged between the plunger body (4) and the buffer body (3),

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 inside to outside, a first cooling chamber (16) communicated with a buffer chamber (19) is arranged in the first shell (5), a second cooling chamber (17) is arranged between the first shell (5) and the second shell (7), a third cooling chamber (18) communicated with an annular communication groove is arranged 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 in sequence, and heat-conducting lubricating oil is filled in the first cooling chamber (16), the second cooling chamber (17), the third cooling chamber (18), the annular communication groove and the buffer chamber (19);

The electromagnetic pulse vibration device comprises a coil (6), a magnet and a non-magnetic pulse body (9), wherein the non-magnetic pulse body (9) is movably arranged in a first cooling chamber (16), the magnet is uniformly fixed on the non-magnetic pulse body (9), the coil (6) is positioned in a second cooling chamber (17) and fixedly sleeved on a first shell (5), and the coil (6) and the magnet are matched to enable the non-magnetic pulse body (9) to vibrate up and down along the axial direction of the first shell (5).

2. The high-frequency pulse generator for a well according to claim 1, wherein a pulse column (10) is fixed at the lower end of the non-magnetic pulse body (9), the pulse column (10) penetrates the first housing (5) and the plunger body (4) in sequence downwards and then enters the lower housing (2), and the penetrating part of the pulse column (10) can slide upwards and downwards.

3. The underground high-frequency pulse generator according to claim 1, wherein the bottom of the annular communicating groove is provided with a step hole penetrating through the plunger body (4), the step hole comprises a large-inner-diameter hole and a small-inner-diameter hole, the lower shell (2) is internally provided with guide holes in one-to-one correspondence with the step holes, one end of the equalizing column (11) is limited in the large-inner-diameter hole, and the other end of the equalizing column penetrates through the small-inner-diameter hole and is limited in the guide hole.

4. The underground high-frequency pulse generator according to claim 1, wherein a partition plate (15) is arranged at the upper end of the first shell (5), a buffer hole (20) for communicating a buffer chamber (19) with the first cooling chamber (16) is formed in the partition plate (15), 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 communicating pipes (14) are fixed between the top of the third shell (8) and the partition plate (15), the first cooling chamber (16) is communicated with the second cooling chamber (17) through the first one-way valves (12), the first cooling chamber (16) is communicated with the third cooling chamber (18) through the one-way communicating pipes (14), and the second cooling chamber (17) is communicated with the third cooling chamber (18) through the second one-way valves (13).

5. A downhole high frequency pulser according to claim 4, wherein the diameter of said buffer hole (20) is smaller than the diameter of the unidirectional communicating tube (14).

6. A downhole high frequency pulser according to claim 4, wherein said first check valve (12), second check valve (13) and one-way communication tube (14) are all evenly distributed around the axis of the first housing (5).

7. A downhole high frequency pulser according to claim 4, wherein the highest level of the heat conductive lubricant in the buffer chamber (19) is not higher than one third of the buffer chamber (19) near one end of the partition plate (15).

8. A downhole high-frequency pulse generator according to any one of claims 1 to 7, wherein a plurality of diversion holes (21) are uniformly formed in the non-magnetic pulse body (9) along the axial direction, an elastic membrane (22) for sealing the diversion holes (21) is fixed at the upper ends of the diversion holes (21) through bolts, and the lower ends of the diversion holes (21) are communicated with the first cooling chamber (16).

9. The underground high-frequency pulse generator of claim 1, wherein the coil (6) is electrically connected with external equipment through wires, an insulating coating is coated on the outer end of the coil (6), and gaps are reserved among a plurality of wires on the coil (6).

10. A downhole high-frequency pulse generator according to claim 1, wherein the buffer body (3) comprises an upper threaded section and a lower conical section which are integrally formed, the buffer chamber (19) is formed in the direction of the upper threaded section from the lower end face of the lower conical section, the regulating valve (23) is fixed on the upper threaded section, and the upper shell (1) is internally provided with an inner threaded section and a conical surface which respectively correspond to the upper threaded section and the lower conical section.