Short-stroke rapid pulse generating device

Abstract

The invention discloses a short-stroke fast pulse generating device which comprises a shell, a generator module, a rotating shaft, a magnetic coupling module, a plunger pump, a piston body, a reset spring, a pressure balance rubber sleeve and a piston rod, the generator module, the rotating shaft, the piston body and the piston rod are sequentially arranged in the shell in the length direction of the shell, and the generator module comprises a stator and a rotor; the stator is fixedly arranged in the shell, the rotor is rotationally arranged in the stator, and the stator is arranged at one end of the rotating shaft. According to the technical effects, the magnetic coupling module is adopted, conversion from mechanical energy to electric energy is achieved through external slurry pressure, the self-power-generation requirement is met, the stroke of 4.6-5.6 mm is designed, pulse signals are generated in a short period through rapid reciprocating motion of the piston body, the pulse signals can be rapidly generated, and therefore the transmission rate of the pulse signals is increased; the device can be used in a complex drilling process, realizes high transmission rate through fast pulse, and provides support for fast decoding of ground equipment.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and more specifically to a short-stroke rapid pulse generator. Background Technology

[0002] During oil drilling, drilling tools typically acquire downhole instrument signals through sensor modules such as probes. With increasing drilling depth and the widespread application of measurement-while-drilling (MWD) instruments such as MWD (Wait-While-Drill), LWD (Low-While-Drilling Tool), and DDM (Drilling Data Management System), downhole conditions are becoming increasingly complex, placing higher demands on real-time data monitoring and transmission. To comprehensively understand the bottom-hole condition, the types and amounts of data that need to be collected have increased significantly. Currently, this type of data is mainly transmitted via mud pulse signals.

[0003] In existing technologies, the efficiency of mud pulse signal encoding and decoding directly affects the real-time performance and reliability of data transmission. However, traditional mud pulse generators generally suffer from low signal generation rates. Existing pulse generators on the market typically have a fixed piston stroke of 10mm, requiring a long cycle to complete one reciprocating motion, which limits the pulse frequency and makes it difficult to achieve high-frequency signal output. This bottleneck severely restricts the transmission efficiency of downhole information with large data volumes and high real-time requirements to the surface, failing to meet the needs of current measurement-while-drilling systems for multi-parameter, high-speed data transmission, thus affecting the timeliness and accuracy of drilling decisions.

[0004] Therefore, there is an urgent need for a new type of pulse generator capable of generating higher frequency pulse signals to improve data transmission rates and meet the technical requirements of high-speed data communication in modern intelligent drilling. Summary of the Invention

[0005] Therefore, the present invention provides a short-stroke fast pulse generator to solve the above-mentioned problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] According to a first aspect of the present invention, a short-stroke rapid pulse generator includes a housing, a generator module, a rotating shaft, a magnetic coupling module, a plunger pump, a piston body, a return spring, a pressure balancing sleeve, and a piston rod. The generator module, the rotating shaft, the piston body, and the piston rod are sequentially arranged within the housing along the length direction of the housing. The generator module includes a stator and a rotor. The stator is fixedly arranged within the housing, and the rotor is rotatably arranged within the stator. The stator is located at one end of the rotating shaft.

[0008] The rotating shaft is rotatably disposed within the housing, and the magnetic coupling module is disposed on the rotating shaft; a power rotor is fitted over the housing, the power rotor is rotatably connected to the housing, and the power rotor is magnetically connected to the magnetic coupling module; the power rotor is driven by mud, and when the power rotor rotates, it drives the magnetic coupling module to rotate.

[0009] The housing has a piston chamber, and the piston body is slidably disposed within the piston chamber. The piston rod is slidably disposed within the housing along the length of the housing, with one end of the piston rod connected to the piston body and the other end extending outside the housing. The stroke of the piston body is 4.6 mm to 5.6 mm. The housing has a limiting member, and the return spring is sleeved on the piston rod, with both ends of the return spring abutting against the piston body and the limiting member, respectively.

[0010] The pressure balancing sleeve is fitted onto the end of the piston rod located outside the housing. The oil inlet of the plunger pump is connected to the oil supply channel, and the oil outlet of the plunger pump is connected to the piston chamber. The piston chamber is connected to the internal space of the pressure balancing sleeve. The generator module is used to supply power to the plunger pump and / or external electrical equipment.

[0011] Furthermore, the generator module is provided with a current output terminal, and the current output terminal is provided with a changeover switch, which is connected to the current input terminal of the plunger pump.

[0012] Furthermore, the housing is provided with an oil passage, one end of which is connected to the oil inlet of the plunger pump, and an oil circuit switch is provided on the oil passage.

[0013] Furthermore, the oil passage is arranged along the axis of the rotating shaft.

[0014] Furthermore, the magnetic coupling module is fixed on the rotating shaft, and the magnetic coupling module is provided with a first magnet; the power rotor is provided with a second magnet, and the first magnet and the second magnet are magnetically connected.

[0015] Furthermore, the power rotor adopts a fan-blade type.

[0016] Furthermore, the housing is multi-segmented, and the multiple segments of the housing are detachably connected to each other.

[0017] Furthermore, the shell is cylindrical.

[0018] Furthermore, the pressure balancing sleeve is made of rubber.

[0019] Furthermore, the displacement of the plunger pump is >1.6L / min.

[0020] This invention has the following advantages: The device employs a magnetic coupling module, converting mechanical energy into electrical energy through external mud pressure to meet self-generation needs. Designed with a stroke of 4.6mm-5.6mm, it generates short-cycle pulse signals through the rapid reciprocating motion of the piston body, enabling rapid pulse signal generation and thus improving the pulse signal transmission rate. This meets the construction requirements for multi-data transmission and timely decoding. The device can be used in complex drilling processes, achieving higher transmission rates for the acquisition of multiple data such as MWD, LWD, and DDM through rapid pulses, supporting rapid decoding by surface equipment. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0023] Figure 1 This is a cross-sectional view of a short-stroke fast pulse generator provided for some embodiments of the present invention.

[0024] Figure 2 This is a partial structural schematic diagram of a short-stroke fast pulse generator provided in some embodiments of the present invention.

[0025] In the diagram: 1. Housing, 2. Current output terminal, 3. Oil circuit switch, 4. Generator module, 5. Oil circuit channel, 6. Shaft, 7. Magnetic coupling module, 8. Piston pump, 9. Piston body, 10. Return spring, 11. Limiting component, 12. Pressure balancing sleeve, 13. Piston rod. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, a short-stroke fast pulse generator according to a first aspect embodiment of the present invention includes a housing 1, a generator module 4, a rotating shaft 6, a magnetic coupling module 7, a plunger pump 8, a piston body 9, a return spring 10, a pressure balancing sleeve 12, and a piston rod 13. The generator module 4, the rotating shaft 6, the piston body 9, and the piston rod 13 are arranged sequentially along the length direction of the housing 1 within the housing 1. The generator module 4 includes a stator and a rotor. The stator is fixedly arranged within the housing 1, and the rotor is rotatably arranged within the stator. The stator is arranged at one end of the rotating shaft 6.

[0029] The rotating shaft 6 is rotatably mounted inside the housing 1, and the magnetic coupling module 7 is mounted on the rotating shaft 6; the housing 1 is fitted with a power rotor, which is rotatably connected to the housing 1 and magnetically connected to the magnetic coupling module 7; the power rotor is driven by mud, and when the power rotor rotates, it drives the magnetic coupling module 7 to rotate.

[0030] The housing 1 has a piston chamber, and the piston body 9 is slidably disposed in the piston chamber. The piston rod 13 is slidably disposed in the housing 1 along the length of the housing 1. One end of the piston rod 13 is connected to the piston body 9, and the other end of the piston rod 13 extends to the outside of the housing 1. The stroke of the piston body 9 is 4.6mm to 5.6mm. The housing 1 has a limiting member 11, and a return spring 10 is sleeved on the piston rod 13. The two ends of the return spring 10 abut against the piston body 9 and the limiting member 11, respectively. The stroke distance of the piston body 9 is 4.6mm-5.6mm, and the reciprocating motion requires less time. By using a large displacement plunger pump and a return spring 10, rapid pulse and high transmission rate are achieved.

[0031] The pressure balancing sleeve 12 is made of rubber and is fitted onto the end of the piston rod 13 located outside the housing 1. The pressure balancing sleeve 12 is used to achieve pressure balance between the downhole mud pressure and the oil inside the device, ensuring normal operation of the device in the downhole high temperature and high pressure environment. The oil inlet of the plunger pump 8 is connected to the oil supply channel, and the oil outlet of the plunger pump 8 is connected to the piston chamber. The piston chamber is connected to the internal space of the pressure balancing sleeve 12. The generator module 4 is used to supply power to the plunger pump 8 and / or external electrical equipment. The plunger pump 8 is a large displacement plunger pump with a displacement of >1.6L / min.

[0032] In this embodiment, it should be noted that the generator module 4 is provided with a current output terminal 2, and the current output terminal 2 is provided with a changeover switch, which is connected to the current input terminal of the plunger pump 8.

[0033] The housing 1 is cylindrical and multi-segmented, with the segments 1 being detachably connected to each other for easy assembly and disassembly.

[0034] The technical effects achieved in this embodiment are as follows: The device uses a magnetic coupling module 7 to convert mechanical energy into electrical energy through external mud pressure, meeting the needs of self-generation. Designed with a stroke of 4.6mm-5.6mm, the rapid reciprocating motion of the piston body 9 generates short-cycle pulse signals, enabling rapid pulse signal generation and thus improving the pulse signal transmission rate, meeting the construction requirements of multi-data transmission and timely decoding. This device can be used in complex drilling processes, achieving higher transmission rates for the acquisition of multiple data such as MWD, LWD, and DDM through rapid pulses, supporting rapid decoding by surface equipment.

[0035] Example 2

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides another short-stroke fast pulse generator, the structure of which includes all the contents of Embodiment 1. Only the different parts are described below.

[0037] In this embodiment, the housing 1 is provided with an oil passage 5, which is arranged along the axis of the rotating shaft 6. One end of the oil passage 5 is connected to the oil inlet of the plunger pump 8, and an oil circuit switch 3 is provided on the oil passage.

[0038] In this embodiment, it should be noted that the entire rapid pulse generator is filled with oil. The pressure balancing sleeve 12 balances the pressure between the oil inside the device and the external mud. The piston body 9 is located between the return spring 10 and the plunger pump 8 and can perform short-distance reciprocating motion. The oil circuit switch 3 controls the large-displacement plunger pump to realize the pressure supply and depressurization of the piston body 9. The return spring 10 realizes the rapid reset of the piston body 9. The magnetic coupling module 7 drives the rotor to rotate at high speed through the mud to provide kinetic energy for the generator module to generate electricity.

[0039] The pressure balancing sleeve 12 is made of high-temperature resistant fluororubber material. When the piston body 9 inside the device is working, the expansion and contraction of the pressure balancing sleeve 12 meets the change in the volume of the oil inside the device. Since the inside and outside of the pressure balancing sleeve 12 are both liquid, the pressure balance between the downhole mud pressure and the oil inside the device can be achieved, ensuring that the device works normally in the downhole high temperature and high pressure environment.

[0040] The piston body 9 has a stroke distance of 4.6mm-5.6mm, which is shorter than the 10mm stroke distance of existing instruments on the market. The reciprocating motion requires less time. When the piston pump 8 rotates at 1800±50r / min with the magnetic coupling module 7, it ensures a displacement of >1.6L / min, providing extremely high power for the ejection of the piston body 9. This compresses the return spring 10 and overcomes the external mud pressure to achieve rapid ejection of the piston body 9, reducing the ejection time of the piston body 9. At the same time, when the piston pump 8 depressurizes, the return spring 10 returns to its pre-compression length and applies force to the piston body 9 to achieve rapid reset of the piston body 9. This short stroke reciprocating motion completes a pulse signal, which takes less time than the pulse signal generation time of the instrument with a 10mm stroke, thus meeting the need for rapid pulses.

[0041] The magnetic coupling module 7 provides kinetic energy to the generator module 4. When the rapid pulse generator is used in the well, a power rotor is installed on the outside of the magnetic coupling module 7. The power rotor will rotate at high speed under the impact of the mud flow, which will drive the magnetic coupling module 7 to rotate synchronously. The magnetic coupling module 7 drives the rotating shaft 6 and the rotor to rotate, so that the rotor will generate electrical energy by magnetically cutting the coil on the generator, thus completing the conversion of mechanical energy into electrical energy.

[0042] The oil circuit switch 3 is used to control the pressure build-up and pressure relief of the plunger pump 8. When the oil circuit switch 3 is closed, the pressure build-up of the plunger pump 8 generates a pushing force on the piston body 9. When the oil circuit switch 3 is open, the pressure build-up of the plunger pump 8 is unloaded, and there is no pushing force on the piston body 9. The return spring 10 can smoothly push the piston body 9 to return to its original position.

[0043] The technical effects achieved by this embodiment are as follows: This device is a self-generating, short-stroke, and fast pulse generator suitable for oil drilling. It solves the problems of long mud pulse signal generation time and inability to transmit data quickly. It can realize the rapid transmission of multiple data, receive signals on the ground in real time and decode them quickly to obtain information from downhole instruments. It can promptly determine whether the environment and attitude data of the instruments meet the construction requirements and provide reference for the construction decision-making of ground personnel in the first time.

[0044] Example 3

[0045] like Figure 1 and Figure 2 As shown, this embodiment provides another short-stroke fast pulse generator, the structure of which includes all the contents of Embodiment 1. Only the different parts are described below.

[0046] In this embodiment, the magnetic coupling module 7 is fixed on the rotating shaft 6, and the magnetic coupling module 7 is provided with a first magnet; the power rotor is provided with a second magnet, and the first magnet and the second magnet are magnetically connected.

[0047] In this embodiment, it should be noted that the power rotor adopts a fan-shaped design. During downhole operation, the power rotor is driven by mud pressure and flow. During the rotation of the power rotor, the magnetic coupling module 7 is driven to rotate, thereby generating electricity.

[0048] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0049] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A short-stroke fast pulse generator, characterized in that, The device includes a housing (1), a generator module (4), a rotating shaft (6), a magnetic coupling module (7), a plunger pump (8), a piston body (9), a return spring (10), a pressure balancing sleeve (12), and a piston rod (13). The generator module (4), the rotating shaft (6), the piston body (9), and the piston rod (13) are arranged sequentially along the length of the housing (1) within the housing (1). The generator module (4) includes a stator and a rotor. The stator is fixedly arranged within the housing (1), and the rotor is rotatably arranged within the stator. The stator is located at one end of the rotating shaft (6). The rotating shaft (6) is rotatably disposed inside the housing (1), and the magnetic coupling module (7) is disposed on the rotating shaft (6); the housing (1) is fitted with a power rotor, the power rotor is rotatably connected to the housing (1), and the power rotor is magnetically connected to the magnetic coupling module (7); the power rotor is driven by mud, and when the power rotor rotates, it drives the magnetic coupling module (7) to rotate; The housing (1) is provided with a piston chamber, and the piston body (9) is slidably disposed in the piston chamber; the piston rod (13) is slidably disposed in the housing (1) along the length direction of the housing (1), one end of the piston rod (13) is connected to the piston body (9), and the other end of the piston rod (13) extends to the outside of the housing (1), and the stroke of the piston body (9) is 4.6mm to 5.6mm; the housing (1) is provided with a limiting member (11), and the return spring (10) is sleeved on the piston rod (13), and the two ends of the return spring (10) abut against the piston body (9) and the limiting member (11) respectively; The pressure balancing sleeve (12) is fitted onto the end of the piston rod (13) located outside the housing (1). The oil inlet of the plunger pump (8) is connected to the oil supply channel, and the oil outlet of the plunger pump (8) is connected to the piston chamber. The piston chamber is connected to the internal space of the pressure balancing sleeve (12). The generator module (4) is used to supply power to the plunger pump (8) and / or external electrical equipment.

2. The short-stroke fast pulse generator according to claim 1, characterized in that, The generator module (4) is provided with a current output terminal (2), and the current output terminal (2) is provided with a changeover switch, which is connected to the current input terminal of the plunger pump (8).

3. The short-stroke fast pulse generator according to claim 1, characterized in that, The housing (1) is provided with an oil passage (5), one end of which is connected to the oil inlet of the plunger pump (8), and an oil circuit switch (3) is provided on the oil passage.

4. The short-stroke fast pulse generator according to claim 3, characterized in that, The oil passage (5) is arranged along the axis of the rotating shaft (6).

5. A short-stroke fast pulse generator according to claim 1, characterized in that, The magnetic coupling module (7) is fixed on the rotating shaft (6), and the magnetic coupling module (7) is provided with a first magnet; the power rotor is provided with a second magnet, and the first magnet and the second magnet are magnetically connected.

6. A short-stroke fast pulse generator according to claim 1, characterized in that, The power rotor is of the fan-blade type.

7. A short-stroke fast pulse generator according to claim 1, characterized in that, The housing (1) is multi-segmented, and the multiple segments of the housing (1) are detachably connected to each other.

8. A short-stroke fast pulse generator according to claim 7, characterized in that, The shell (1) is cylindrical.

9. A short-stroke fast pulse generator according to claim 1, characterized in that, The pressure balancing sleeve (12) is made of rubber.

10. A short-stroke fast pulse generator according to claim 1, characterized in that, The displacement of the plunger pump (8) is >1.6L / min.

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