Self-excitation pulse oscillation generating device

Abstract

The utility model discloses a self-excited pulse oscillation generating device, which relates to the field of downhole tools, and comprises an outer shell, the right side of the outer shell is in threaded connection with a connecting shell, the right side of the connecting shell is in clearance connection with a drill bit shell through a hole shaft, and the lower end of the drill bit shell is connected with a PDC drill bit; the right side of the drill bit shell is in threaded connection with an oscillation device shell, and the oscillation device shell is located in the outer shell. According to the self-excitation pulse oscillation generating device, by arranging the fluid control unit, the connecting shell and the drill bit shell, the rock breaking capacity of a PDC drill bit is enhanced conveniently, vibration and impact caused by flow fluctuation of drilling fluid on oscillation loads are reduced, the pulse cavity is arranged, erosive wear of the drilling fluid to the cavity is reduced conveniently, and the service life of the pulse cavity is prolonged. And the adjusting bush is arranged, flowing of drilling fluid and transmission of oscillation loads are convenient to optimize, and meanwhile the pressure relief flow channel and the high-pressure flow channel are arranged, so that the device is convenient to protect.

Description

TECHNICAL FIELD

[0001] The utility model relates to downhole tool technical field, concretely is a self-excitation pulse oscillation generating device. BACKGROUND

[0002] Downhole tool plays a vital role in the oil and gas drilling and mining special equipment manufacturing and service industry category, with the continuous innovation of global energy demand growth and oil and gas exploration and development technology, thereby downhole tool usually uses self-excitation pulse oscillation generating device, the existing self-excitation pulse oscillation generating device when using, due to single function, in the process of drilling in deep well hard formation, it is easy to appear drillability, low mechanical speed, long drilling cycle.

[0003] In order to overcome the above-mentioned defects, the prior art (application number: 201420818875.8, the application date is December 19, 2014 Chinese patent) discloses a self-excitation oscillation jet generating device, including inlet section, oscillation cavity, feedback loop and nozzle: the inlet section is located at the left end of the device, the oscillation cavity is located in the middle of the device, the nozzle is located at the right end of the device, the three are sequentially connected with each other: namely the inlet section connects the oscillation cavity, the oscillation cavity connects the nozzle, there are multiple feedback loops near the oscillation cavity outlet connected to the oscillation cavity inlet, the device can produce self-excitation oscillation jet for liquid and gas working medium, and does not need any movable parts, convenient to use, simple and compact structure is used in the field of liquid atomization, heat transfer enhancement, flow control, cleaning, cutting, crushing tool etc.

[0004] Although the prior art can solve the drilling of liquid and gas, since the generation of self-excitation oscillation jet depends on the self-excitation oscillation process of fluid in the oscillation cavity, this process may be affected by various factors, thereby the vibration and impact caused by the fluctuation of drilling fluid flow reduce the rock breaking capacity of PDC drill bit, and the transmission of drilling fluid flow and oscillation load cannot be avoided, and no protection structure is arranged, so that impurities easily enter the self-excitation oscillation jet generating device, increase the service life, the stability of tool.

[0005] Therefore we put forward a kind of self-excitation pulse oscillation generating device can well solve the above problems. Utility model content

[0006] The utility model discloses a purpose lies in providing a kind of self-excitation pulse oscillation generating device, to solve the problem of the self-excitation pulse oscillation generating device in the above background technology, since the generation of self-excitation pulse oscillation depends on the self-excitation process of fluid in oscillation cavity, the process can be influenced by multiple factors, thereby the vibration and impact caused by drilling fluid flow fluctuation, reduce the rock breaking capacity of PDC drill bit, and the flow and oscillation load of drilling fluid cannot be avoided transmission, and no protection structure is set, impurities easily enter self-excitation pulse oscillation generating device, increase service life, the stability problem of tool.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of self-excitation pulse oscillation generating device, including outer shell, the right side of the outer shell is connected with connecting shell by screw thread, the right side of the connecting shell is connected with drill bit shell by hole shaft gap, the lower end of the drill bit shell is connected with PDC drill bit;The right side of the drill bit shell is connected with oscillation device shell by screw thread, and oscillation device shell is located in the inside of outer shell, the oscillation device shell includes fluid control unit, and the outer wall of the fluid control unit is connected with oscillation module by hole shaft gap;The left side of the oscillation device shell is connected with end cover by bolt, and the inside of the right side of end cover is provided with screw hole, and the left side of the end cover is welded with self-excitation pulse cavity.

[0008] As the preferred technical scheme of the present application, the inside of the oscillation device shell is connected with the adjusting bushing by hole shaft gap, and the adjusting bushing is located in the inside of the connecting shell, the inside of the oscillation device shell is connected with the supporting overflow unit by hole shaft gap, and the inside of the supporting overflow unit is provided with the throttling water eye.

[0009] As the preferred technical scheme of the present application, the fluid control unit and oscillation module are placed in the inside of the oscillation device shell by hole shaft gap cooperation, and the fluid control unit end is rotatably connected with the supporting overflow unit.

[0010] As the preferred technical scheme of the present application, the self-excitation pulse cavity includes upper overflow water eye, the inside of the self-excitation pulse cavity is provided with pulse chamber, and the surface of pulse chamber is sprayed wear-resistant coating, the inside of the self-excitation pulse cavity is provided with lower overflow water eye.

[0011] As the preferred technical scheme of the present application, the outside of the oscillation device shell is provided with two pressure relief flow channels, the outside of the oscillation device shell is provided with four high-pressure flow channels, and the high-pressure flow channels are symmetrically arranged on the two sides of the pressure relief flow channels.

[0012] As the preferred technical scheme of the present application, the oscillation device shell and end cover are detachably connected, and the end cover and self-excitation pulse cavity are in communication.

[0013] As a preferred technical scheme of the present application, the pulse chamber is in communication with both the lower flow passage and the upper flow passage, and the pulse chamber, the lower flow passage and the upper flow passage are integrally arranged with the self-excited pulse cavity.

[0014] Compared with the prior art, the self-excited pulse oscillation generating device has the advantages that: the fluid control unit, the connecting shell and the drill bit shell are arranged, the fluid control unit and the throttling flow passage in the supporting flow passage unit jointly act, the load is transmitted to the PDC drill bit through the connecting shell and the drill bit shell, the periodic high-frequency low-amplitude circumferential oscillation load received by the PDC drill bit enhances the rock breaking capacity of the PDC drill bit, the rock breaking capacity is improved, the oscillation load reduces the vibration and impact caused by the flow fluctuation of the drilling fluid, and the drilling speed is improved.

[0015] 1. The fluid control unit, the connecting shell and the drill bit shell are arranged, the fluid control unit and the throttling flow passage in the supporting flow passage unit jointly act, the load is transmitted to the PDC drill bit through the connecting shell and the drill bit shell, the periodic high-frequency low-amplitude circumferential oscillation load received by the PDC drill bit enhances the rock breaking capacity of the PDC drill bit, the rock breaking capacity is improved, and the rock breaking capacity is improved.

[0016] Further, the pulse chamber is arranged, the wear-resistant coating on the surface of the pulse chamber reduces the erosion and abrasion of the chamber by the drilling fluid, and the service life of the self-excited pulse cavity is prolonged.

[0017] Further, the adjusting bushing is arranged, the gap between the connecting shell and the drill bit shell is adjusted through the design of the adjusting bushing, the flow of the drilling fluid and the transmission of the oscillation load are optimized, and the abrasion of the components is reduced.

[0018] 2. The pressure relief flow passage and the high-pressure flow passage are arranged, the impurities and foreign matters in the drilling fluid are more easily blocked outside the device through the cooperation of the pressure relief flow passage and the high-pressure flow passage, the possibility of the impurities and foreign matters entering the fluid control unit and the oscillation module is reduced, the key components are protected from damage, the possibility of the oscillation generating device braking is reduced, and the stability of the tool is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view structural schematic view of the utility model;

[0020] Figure 2 It is a side view structural schematic view of the utility model;

[0021] Figure 3 It is a front view sectional structure schematic view of the utility model;

[0022] Figure 4 It is a schematic diagram of the front and side view cross-section structure of the utility model;

[0023] Figure 5 It is a schematic diagram of the local cross-section structure of the self-excited pulse cavity of the utility model;

[0024] Figure 6 It is the utility model Figure 3 The enlarged structure schematic diagram of A in the middle.

[0025] In the figure: 1, outer shell; 2, self-excited pulse cavity; 3, end cover; 4, fluid control unit; 5, oscillation module; 6, oscillation device shell; 7, supporting overflow unit; 8, adjusting bush; 9, connecting shell; 10, drill bit shell; 11, pressure relief flow channel; 12, high-pressure flow channel; 13, throttling water eye; 14, pulse chamber; 15, lower overflow water eye; 16, upper overflow water eye. Specific implementation

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] Please refer to Figures 1-6 The utility model provides the following technical scheme:

[0028] Embodiment one: the self-excited oscillation jet flow generating device in the market is convenient to solve the problem that, when being used, the generation of self-excited oscillation jet flow depends on the self-excited oscillation process of fluid in the oscillation cavity, and this process may be influenced by various factors, thereby the vibration and impact caused by the fluctuation of drilling fluid flow reduce the rock breaking capacity of PDC drill bit, and the transmission of drilling fluid flow and oscillation load cannot be avoided. The self-excited pulse oscillation generating device in the embodiment discloses the following technical content, and the attached Figure 1 -attached Figure 6, including the outer shell 1, the right side of the outer shell 1 is threadedly connected with the connecting shell 9, the right side of the connecting shell 9 is connected with the drill bit shell 10 through the hole shaft gap, the lower end of the drill bit shell 10 is connected with the PDC drill bit; the right side of the drill bit shell 10 is threadedly connected with the oscillation device shell 6, and the oscillation device shell 6 is located in the inside of the outer shell 1, the oscillation device shell 6 includes the fluid control unit 4, the outer wall of the fluid control unit 4 is connected with the oscillation module 5 through the hole shaft gap; the left side of the oscillation device shell 6 is boltedly connected with the end cover 3, and the inside of the right side of the end cover 3 is provided with a screw hole, the left side of the end cover 3 is weldedly connected with the self-excited pulse cavity 2; the inside of the oscillation device shell 6 is connected with the adjusting bushing 8 through the hole shaft gap, and the adjusting bushing 8 is located in the inside of the connecting shell 9, the inside of the oscillation device shell 6 is connected with the supporting overflow unit 7 through the hole shaft gap, the inside of the supporting overflow unit 7 is provided with the throttling water eye 13, the fluid control unit 4 and the oscillation module 5 are placed in the inside of the oscillation device shell 6 through the hole shaft gap cooperation, and the fluid control unit 4 is rotatably connected with the supporting overflow unit 7 at the end; the self-excited pulse cavity 2 includes the upper overflow water eye 16, the inside of the self-excited pulse cavity 2 is provided with the pulse chamber 14, and the surface of the pulse chamber 14 is sprayed with a wear-resistant coating, the inside of the self-excited pulse cavity 2 is provided with the lower overflow water eye 15; the oscillation device shell 6 and the end cover 3 are detachably connected, the end cover 3 and the self-excited pulse cavity 2 are in communication, the pulse chamber 14, the lower overflow water eye 15 and the upper overflow water eye 16 are in communication, and the pulse chamber 14, the lower overflow water eye 15 and the upper overflow water eye 16 are integrally arranged with the self-excited pulse cavity 2.

[0029] After the drilling fluid flows into the pulse chamber 14 of the self-excited pulse cavity 2 from the upper flow-through water hole 16, the drilling fluid is impacted in the pulse chamber 14 to generate an axial pulse load, and then the drilling fluid flows out from the lower flow-through water hole 15 to the end cover 3. Due to the pulse load, the pressure and flow rate of the drilling fluid change, part of the drilling fluid flows out through the lower flow-through water hole 15, and part of the drilling fluid flows into the outer flow channel or the central flow-through hole of the end cover 3. The drilling fluid flowing into the end cover 3 enters the fluid control unit 4 through the central flow-through hole, and the fluid control unit 4 and the throttle water hole 13 in the bearing flow-through unit 7 jointly throttle the drilling fluid to increase its pressure. This throttling effect forms a high-pressure flow channel 12 and a low-pressure flow channel. Under the adjustment of the fluid control unit 4, the upper end of the throttle water hole 13 is the high-pressure flow channel 12, and the lower end is the low-pressure flow channel, so that the pressure chambers at both ends of the oscillation module 5 are periodically alternately connected with the high-pressure flow channel 12 and the low-pressure flow channel. The pressure difference in the high-pressure and low-pressure chambers drives the oscillation module 5 to reciprocate in the circumferential direction, so that the reciprocating motion of the oscillation module 5 collides with the oscillation device shell 6 to generate periodic high-frequency low-amplitude circumferential oscillation load. These oscillation loads are transmitted to the PDC drill bit through the connecting shell 9 and the drill bit shell 10, thereby enhancing the rock breaking capacity of the drill bit. The periodic high-frequency low-amplitude circumferential oscillation load generated by the self-excited pulse oscillation generating device helps to break the rock, reduces the vibration and impact caused by the fluctuation of the drilling fluid flow, improves the drilling speed, reduces the erosion and wear of the chamber by the drilling fluid through the wear-resistant coating on the surface of the pulse chamber 14, prolongs the service life of the self-excited pulse cavity 2, adjusts the gap between the connecting shell 9 and the drill bit shell 10 by adjusting the design of the bushing 8, thereby optimizing the flow of the drilling fluid and the transmission of the oscillation load, reducing the wear of the parts, and enhancing the overall structure and reliability by the integrated arrangement between the pulse chamber 14, the lower flow-through water hole 15 and the upper flow-through water hole 16 and the self-excited pulse cavity 2, thereby reducing the risk of leakage and failure.

[0030] Embodiment two: the self-excited pulse oscillation generating device in this embodiment discloses the following technical content, which is convenient for protecting the self-excited pulse oscillation generating device, and can refer to the accompanying drawings Figure 1 -Appendix Figure 3 and Appendix Figure 6 The outer part of the oscillation device shell 6 is provided with two pressure relief flow channels 11, and the outer part of the oscillation device shell 6 is provided with four high-pressure flow channels 12, and the high-pressure flow channels 12 are symmetrically arranged on both sides of the pressure relief flow channels 11.

[0031] The drilling fluid will encounter the pressure relief flow channel 11 outside the oscillation device shell 6 in the flow process, in the pressure relief flow channel 11, part of the energy of the drilling fluid is released, forming a pressure drop, which helps to reduce the direct impact of the drilling fluid on the device, and to adjust its flow state in advance, then the drilling fluid enters the high-pressure flow channel 12 symmetrically distributed on both sides of the pressure relief flow channel 11, in the high-pressure flow channel 12, the drilling fluid is accelerated to form a high-pressure state, and this high-pressure state is the key factor to generate the axial pulsating load, the axial vibration load is converted into the circumferential reciprocating motion of the oscillation module 5 through the interaction of the fluid control unit 4 and the oscillation module 5, and since the pressure relief flow channel 11 is also arranged outside the oscillation device shell 6, the impurities in the drilling fluid are more likely to be blocked outside the device, which reduces the possibility of impurities entering the fluid control unit 4 and the oscillation module 5, protects these key components from damage, thereby reducing the possibility of the oscillation generating device braking, and improving the stability of the tool.

[0032] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0033] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A self-excited pulse oscillation generating device, comprising an outer shell (1), a connecting shell (9) is threadedly connected to the right side of the outer shell (1), a drill bit shell (10) is connected to the right side of the connecting shell (9) through a hole shaft gap, and a PDC drill bit is connected to the lower end of the drill bit shell (10); an oscillation device shell (6) is threadedly connected to the right side of the drill bit shell (10) and located inside the outer shell (1), the oscillation device shell (6) comprises a fluid control unit (4), and an oscillation module (5) is connected to the outer wall of the fluid control unit (4) through a hole shaft gap; a end cover (3) is boltedly connected to the left side of the oscillation device shell (6), a screw hole is formed in the right side of the end cover (3), and a self-excited pulse cavity (2) is welded to the left side of the end cover (3). characterized in that An adjusting bushing (8) is connected to the inside of the oscillation device shell (6) through a hole shaft gap and located inside the connecting shell (9), and a supporting overflow unit (7) is connected to the inside of the oscillation device shell (6) through a hole shaft gap, and a throttling water eye (13) is arranged in the inside of the supporting overflow unit (7). The fluid control unit (4) and the oscillation module (5) are placed in the inside of the oscillation device shell (6) through a hole shaft gap, and the fluid control unit (4) is rotationally connected to the supporting overflow unit (7) at the end.

2. A self-oscillating pulsed oscillator as claimed in claim 1, characterized in that: The self-excited pulse cavity (2) comprises an upper overflow water eye (16), the inside of the self-excited pulse cavity (2) is provided with a pulse chamber (14), the surface of the pulse chamber (14) is sprayed with a wear-resistant coating, and the inside of the self-excited pulse cavity (2) is provided with a lower overflow water eye (15).

3. A self-oscillating pulsed oscillator as claimed in claim 1, characterized in that: Two pressure relief flow channels (11) are arranged on the outside of the oscillation device shell (6), four high-pressure flow channels (12) are arranged on the outside of the oscillation device shell (6), and the high-pressure flow channels (12) are symmetrically arranged on the two sides of the pressure relief flow channels (11).

4. A self-oscillating pulsed oscillator as claimed in claim 1, characterized in that: The oscillation device shell (6) and the end cover (3) are detachably connected, and the end cover (3) and the self-excited pulse cavity (2) are in communication.

5. A self-oscillating pulsed oscillator as claimed in claim 2, characterized in that: The pulse chamber (14), the lower overflow water eye (15) and the upper overflow water eye (16) are in communication, and the pulse chamber (14), the lower overflow water eye (15) and the upper overflow water eye (16) are integrally arranged with the self-excited pulse cavity (2).

6. A self-oscillating pulsed oscillator as claimed in claim 1, characterized in that: ​ 7. A self-oscillating pulsed oscillator as claimed in claim 4, characterized in that: ​

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