Underground repeated vibration starting device for oil and gas drilling

Abstract

The utility model discloses an oil gas well drilling underground repeated vibration device, which relates to the technical field of oil well drilling, and comprises a barrel body, a magnetic attraction assembly, a piston assembly, a vibration head and a spring, and the barrel body comprises a barrel body and a barrel cover which are connected with each other; a first inner spigot, a first through hole and a second inner spigot which are communicated with one another are sequentially formed in the vertical central axis of the cylinder body from top to bottom in a penetrating manner; the magnetic attraction assembly comprises an armature and a permanent magnet which are located in the cylinder body. The piston assembly comprises a piston suitable for being slidably connected into the first through hole of the barrel body, a first containing groove is formed in the center of the top of the piston, and a permanent magnet is contained in the first containing groove. The vibration starting head is vertically inserted into the center of the bottom of the piston; the spring sleeves the vibration starting head, one end of the spring is suitable for abutting against the lower end face of the piston, and the other end of the spring is suitable for abutting against the end face of the second inner spigot. The vibration starting device thoroughly solves the problems that a traditional vibration starting device is limited in vibration starting frequency, poor in vibration starting effect, complex in operation and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil drilling, and in particular relates to an underground repeated vibration device for oil and gas drilling. Background Art

[0002] In oil and gas drilling operations, the application of vibration devices is of great significance in breaking hard formations, increasing drilling speed and reducing drill bit wear.

[0003] Drilling drill bit stuck accident is the most common and most likely underground engineering accident in drilling construction. When drilling tools several kilometers long are working in the well, they often cannot be lifted up, lowered or rotated due to reasons such as falling blocks and collapse of the well wall. This is called drilling drill bit stuck accident.

[0004] The existing technology of shock devices includes two categories: mechanical and hydraulic. They are classified according to different release mechanisms. In essence, they all force the drill string above the stuck point to elastically stretch or compress and then suddenly release it by lifting or pressing down the drill string, and use the elastic potential energy stored by the stretch or compression of the drill string to impact the stuck point. Each lifting and lowering completes a shock operation. The jamming release operation is to repeatedly lift and lower the drill string until the stuck point is released. However, in highly deviated wells or horizontal wells, the drill string is in a state of leaning against the well wall. Most of the elastic potential energy stored in the drill string released by the shock operation is consumed by the friction between the drill string and the well wall. The impact force reaching the stuck point is severely attenuated, and the success rate of jamming release is greatly reduced. Increasing the shock force and the number of shocks will damage the drilling tools and drilling equipment, increasing the risk of secondary accidents.

[0005] The above-mentioned traditional vibration devices often have problems such as limited vibration times, poor vibration effects and complicated operations, which affect the smooth progress of drilling operations. Utility Model Content

[0006] In view of this, the main purpose of the utility model is to provide an underground repeated vibration device for oil and gas drilling to solve the problems of limited vibration times, poor vibration effect and complicated operation of traditional vibration devices.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes an oil and gas drilling downhole repeated vibration device, comprising:

[0008] The cylinder body comprises a cylinder body and a cylinder cover connected to each other, wherein a first inner stop, a first through hole and a second inner stop connected to each other are sequentially penetrated from top to bottom on the vertical center axis of the cylinder body;

[0009] A magnetic attraction assembly, comprising an armature located in a first inner stopper of the barrel and a permanent magnet located in a first through hole of the barrel;

[0010] The piston assembly comprises a piston adapted to be slidably connected to the first through hole of the cylinder body, wherein the center of the top of the piston is provided with a first receiving groove for receiving the permanent magnet;

[0011] A vibration head is vertically inserted into the bottom center of the piston;

[0012] A spring, sleeved on the vibration-generating head, one end of the spring being adapted to abut against the lower end surface of the piston, and the other end being adapted to abut against the end surface of the second inner stop;

[0013] When the permanent magnet and the armature are driven to separate by an external force, the permanent magnet drives the piston to move downward, thereby driving the vibration head to slide and vibrate.

[0014] Optionally, the piston assembly further includes a third sealing ring and a piston ring arranged on the outer circumference of the piston, the outer circumference of the piston is provided with a first ring groove and a second ring groove, and the third sealing ring and the piston ring are respectively correspondingly clamped in the first ring groove and the second ring groove.

[0015] Optionally, the cylinder cover includes a cylinder cover flange end and a cylinder cover body that are integrally connected, and the cylinder cover flange end is symmetrically arranged on the top of the cylinder cover body, the cylinder cover body is also provided with a gas buffer groove opening toward the first through hole, and a second through hole vertically penetrates the center of the armature, and the top side of the second through hole is connected to the gas buffer groove.

[0016] Optionally, it also includes a pneumatic drive assembly, which includes a quick hose connector connected to the cylinder cover and a regulating valve and an air source that are sequentially connected to the quick hose connector, and the air source supplies air to the gas buffer groove (123) and the second through hole through the regulating valve and the quick hose connector to disengage the permanent magnet from the armature.

[0017] Optionally, a first annular sealing groove is provided on the lower end surface of the barrel cover body, and a first sealing ring is filled in the first annular sealing groove.

[0018] Optionally, a second annular sealing groove is provided on the lower end surface of the flange end of the cylinder cover, and a second sealing ring is filled in the second annular sealing groove.

[0019] Optionally, a vertically arranged first socket is also opened in the bottom center of the piston, and the shock-generating head includes a plug shaft and an impact block coaxially and integrally connected, the diameter of the impact block is larger than the diameter of the plug shaft, and the plug shaft is suitable for being inserted in the first socket, and the top end face of the impact block is suitable for abutting against the bottom end face of the piston.

[0020] Optionally, the magnetic attraction assembly further includes a magnetic isolation component coated on the permanent magnet, and the magnetic isolation component includes a magnetic isolation ring sleeved on the outer circumference of the permanent magnet and a magnetic isolation plate adhered to the bottom of the permanent magnet.

[0021] Optionally, the cylinder body and the cylinder cover are fixedly connected via a plurality of annular evenly distributed connecting members.

[0022] Optionally, it also includes a base fixedly connected to the bottom of the cylinder body, and the base is suitable for vertically supporting the cylinder body.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] In the technical solution of the utility model, the downhole repeated vibration device for oil and gas drilling is composed of a cylinder, a magnetic attraction component, a piston component, a vibration head and a spring. The cylinder body and the cylinder cover are assembled and sealed together. The magnetic attraction component, the piston component, the vibration head and the spring are all installed in the cylinder body. The magnetic attraction component is located in the internal space between the cylinder body and the cylinder cover. The magnetic attraction component is composed of an armature and a permanent magnet. The permanent magnet is installed in the first accommodating groove of the piston. The piston of the piston assembly is slidably connected to the first through hole of the cylinder body, and the permanent magnet is completely adsorbed on the lower surface of the armature in the initial state. At this time, the spring at the bottom is sleeved on the vibration head and is in a natural telescopic state. ; When the armature and the permanent magnet are separated by external force, the permanent magnet drives the piston to move downward; since the spring sleeve is used to connect the shock head, and the spring is a key component for energy storage, the shock head can be flexibly controlled to strike downward through the shoulder at the bottom of the piston, the second inner stop on the barrel, and the shock head, making the drilling tool operation more stable; the device has a simple and reliable mechanical structure and is easy to achieve shocking, which solves the problems of limited shocking times, poor shocking effect, and complex operation of traditional shocking devices, realizes repeated shocking operations underground, improves drilling efficiency and drilling quality, and has important practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the internal structure of the downhole repeated vibration device for oil and gas drilling in the embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the cylinder in the embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the cylinder cover in the embodiment of the utility model;

[0029] Figure 4 It is a schematic diagram of the assembly structure of the magnetic attraction component, the piston component and the vibration head in the embodiment of the utility model.

[0030] Description of Figure Numbers:

[0031] 1-Cylinder;

[0032] 11-body; 111-first inner stop; 112-first through hole; 113-second inner stop;

[0033] 12-cylinder cover; 121-cylinder cover flange end; 1211-second annular sealing groove; 1212-second sealing ring; 122-cylinder cover body; 1221-first annular sealing groove; 1222-first sealing ring; 123-gas buffer groove;

[0034] 13-connecting piece; 131-screw; 132-spring washer;

[0035] 2-Magnetic suction component;

[0036] 21-armature; 211-second through hole;

[0037] 22-permanent magnet;

[0038] 23-magnetic isolation component; 231-magnetic isolation ring; 232-magnetic isolation plate;

[0039] 3-Piston assembly;

[0040] 31-piston; 311-first annular groove; 312-second annular groove; 313-first receiving groove; 314-first plug hole;

[0041] 32-third sealing ring;

[0042] 33-piston ring;

[0043] 4- shock head;

[0044] 41-insertion shaft; 42-impact block;

[0045] 5- Spring;

[0046] 6-pneumatic drive assembly; 61-quick hose connector;

[0047] 7- Base. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0051] See also Figures 1 to 4 As shown, the embodiment of the utility model provides a downhole repeated vibration device for oil and gas drilling, and the downhole repeated vibration device for oil and gas drilling includes a cylinder 1, a magnetic suction component 2, a piston component 3, a vibration head 4 and a spring 5, wherein:

[0052] The cylinder body 1 includes a cylinder body 11 and a cylinder cover 12 connected to each other. The cylinder cover 12 is covered on the top of the cylinder body 11. A first inner stop 111, a first through hole 112 and a second inner stop 113 are sequentially penetrated from top to bottom on the vertical center axis of the cylinder body 11. The magnetic attraction component 2 includes an armature 21 and a permanent magnet 22 located in the cylinder body 11. The piston component 3 includes a piston 31, which is suitable for sliding connection in the first through hole 112 of the cylinder body 11. The top of the piston 31 A first accommodating groove 313 is opened at the center of the part, and the permanent magnet 22 is placed in the first accommodating groove 313; the vibration head 4 is vertically inserted in the bottom center of the piston 31; the spring 5 is sleeved on the vibration head 4, and one end of the spring 5 is suitable for abutting on the lower end surface of the piston 31, and the other end is suitable for abutting on the end surface of the second inner stop 113; when the permanent magnet 22 and the armature 21 are separated by external force, the permanent magnet 22 drives the piston 31 to move downward, and then drives the vibration head 4 to slide and vibrate.

[0053] In the technical solution of the utility model, the downhole repeated vibration device for oil and gas drilling is composed of a cylinder body 1, a magnetic suction component 2, a piston component 3, a vibration head 4 and a spring 5. The cylinder body 11 and the cylinder cover 12 are assembled and sealed together. The magnetic suction component 2, the piston component 3, the vibration head 4 and the spring 5 are all installed in the cylinder body 11. The magnetic suction component 2 is located in the internal space between the cylinder body 11 and the cylinder cover 12. The magnetic suction component 2 is composed of an armature 21 and a permanent magnet 22. The armature 21 and the permanent magnet 22 are both located in the cylinder body 11. The permanent magnet 22 is installed in the first accommodating groove 313 of the piston 31. The piston 31 of the piston assembly 3 is slidably connected in the first through hole 112 of the cylinder body 11, and the permanent magnet 22 is completely adsorbed on the lower surface of the armature 21 in the initial state. At this time, the spring at the bottom The spring 5 is sleeved on the shock head 4 and is in a natural expansion and contraction state; when the driving armature 21 and the permanent magnet 22 are separated, the permanent magnet 22 drives the piston 31 to move downward; since the spring 5 is sleeved and connected to the shock head 4, and the spring is a key component for energy storage, the shock head 4 can be flexibly controlled to strike downward through the cooperation of the axial shoulder at the bottom of the piston 31, the second inner stop 113 on the barrel 11 and the shock head 4; the compressed spring 5 stores energy, thereby making the drilling tool operation more stable, the mechanical structure simple and reliable, and easy to achieve shock, solving the problems of limited shock times, poor shock effect and complicated operation of traditional shock devices, realizing repeated shock operations underground, improving drilling efficiency and drilling quality, and having important practical application value.

[0054] It should be pointed out that the downhole repetitive vibration device for oil and gas drilling can be installed at an appropriate position of the drilling equipment, such as inside the drill pipe or behind the drill bit. Before the drilling operation begins, the vibration parameters are set through the ground control system. As the drilling progresses, the downhole repetitive vibration device for oil and gas drilling automatically adjusts the parameters of the vibration head as needed to achieve downhole repetitive vibration operation. At the same time, the device transmits the data during the drilling process to the ground control system so that the staff can understand the progress of the drilling operation in a timely manner.

[0055] For further information, see Figure 1 and Figure 4 As shown, the piston assembly 3 also includes a third sealing ring 32 and a piston ring 33, and the third sealing ring 32 and the piston ring 33 are arranged on the outer circumference of the piston 31. The outer circumferential direction of the piston 31 is provided with a first ring groove 311 and a second ring groove 312, and the third sealing ring 32 and the piston ring 33 are respectively correspondingly clamped in the first ring groove 311 and the second ring groove 312.

[0056] In the technical solution of the utility model, a first annular groove 311 and a second annular groove 312 are provided on the outer circumference of the piston 31, and a third sealing ring 32 and a piston ring 33 are respectively placed in the first annular groove 311 and the second annular groove 312, so as to completely prevent the fluid from surging into the internal channel of the piston and the external annular channel between the piston 31 and the cylinder 1, and the use of piston ring sealing not only has a good sealing effect, but also has better repeatability.

[0057] For further information, see Figure 3 and Figure 4 As shown, the cylinder cover 12 includes a cylinder cover flange end 121 and a cylinder cover body 122 which are integrally connected, and the cylinder cover flange end 121 is symmetrically arranged on the top of the cylinder cover body 122. The cylinder cover body 122 is also provided with a gas buffer groove 123 which opens toward the first through hole 112. A second through hole 211 which passes vertically through the center of the armature 21 is provided, and the top side of the second through hole 211 is connected to the gas buffer groove 123.

[0058] In the technical solution of the utility model, the cylinder cover 12 is composed of a cylinder cover flange end 121 and a cylinder cover body 122. Since the cylinder cover body 122 of the cylinder cover 12 is pressed on the upper surface of the armature 21, the armature 21 separates the piston 31 from the gas buffer groove 123 of the cylinder cover body 122. In order to provide a pneumatic driving force to the piston 31, a second through hole 211 is opened on the armature 21, and the second through hole 211 is connected to the gas buffer groove 123, so that the air pressure entering the gas buffer groove 123 acts on the permanent magnet 22 through the second through hole 211, resisting the adsorption force between the permanent magnet 22 and the armature 21, thereby pushing the piston 31 to move downward, driving the vibration head 4 at the bottom of the piston 31 to vibrate up and down.

[0059] For further information, see Figure 2 , 3 As shown, the oil and gas drilling downhole repeated shock device also includes a pneumatic drive assembly 6, which includes a quick hose connector 61, a regulating valve and an air source (not shown in the figure, all of which are prior art), the quick hose connector 61 is connected to the cylinder cover 12, and the regulating valve and the air source are connected to the quick hose connector 61 in sequence, so that the air source pressure is supplied to the gas buffer groove 123 and the second through hole 211 through the regulating valve and the quick hose connector 61, and the permanent magnet 22 is driven to separate from the armature 21 through the action of the air pressure. In the technical solution of the utility model, the pneumatic drive assembly 6 is used as a key driving force source, and the air pressure is supplied by an external air source, and the controllable separation between the permanent magnet 22 and the armature 21 is achieved under the control of the regulating valve.

[0060] For more details, see Figure 3 As shown, a first annular sealing groove 1221 is provided on the lower end surface of the barrel cover body 122 , and a first sealing ring 1222 is filled in the first annular sealing groove 1221 .

[0061] Therefore, the first sealing ring 1222 is provided to prevent the gas in the gas buffer groove 123 of the cylinder cover 12 from leaking out from the assembly gap between the cylinder cover 12 and the cylinder body 11 .

[0062] For further information, see Figure 3 As shown, a second annular sealing groove 1211 is provided on the lower end surface of the flange end 121 of the cylinder cover, and a second sealing ring 1212 is filled in the second annular sealing groove 1211 .

[0063] In the technical solution of the utility model, since the barrel cover flange end 121 abuts against the armature 21, there is an assembly gap between the barrel cover flange end 121 and the armature 21. In order to prevent gas leakage in the gas buffer groove 123, a second sealing ring 1212 is also arranged between the barrel cover flange end 121 and the armature 21 to ensure the sealing performance inside the gas buffer groove 123.

[0064] For further information, see Figure 4 As shown, a vertically arranged first socket 314 is also opened at the bottom center of the piston 31, and the shock head 4 includes a plug shaft 41 and an impact block 42 which are coaxially and integrally connected. The diameter of the impact block 42 is larger than the diameter of the plug shaft 41, and the plug shaft 41 is suitable for being inserted into the first socket 314, and the top end face of the impact block 42 is suitable for abutting against the bottom end face of the piston 31.

[0065] Specifically, in the utility model, the vibration head 4 is provided with an insertion shaft 41 on one side of the top end, and the insertion shaft 41 is connected in the first socket 314 of the piston 31 by interference fit, so that the vibration head 4 is fixedly connected to the piston 31, and the lower seat is driven by the piston 31 to reciprocate up and down to cause vibration.

[0066] For details, please refer to Figure 1 As shown, the magnetic attraction assembly 2 also includes a magnetic isolation component 23 coated on the permanent magnet 22, and the magnetic isolation component 23 includes a magnetic isolation ring 231 sleeved on the outer circumference of the permanent magnet 22 and a magnetic isolation plate 232 adhered to the bottom of the permanent magnet 22. In the technical solution of the utility model, the permanent magnet 22 is arranged in the first plug hole 314 of the piston 31, and a magnetic isolation layer is arranged outside the permanent magnet 22, which can play a role of magnetic isolation during operation.

[0067] For more details, see Figure 1 , 2 As shown, the barrel body 11 and the barrel cover 12 are fixedly connected by a plurality of annular evenly distributed connecting members 13. In this embodiment, a screw hole is provided between the barrel body 11 and the barrel cover 12, and a screw 131 is threadedly connected in the screw hole between the barrel body 11 and the barrel cover 12, and a spring washer 132 is sleeved on the screw 131 to play a role in stable connection.

[0068] For further information, see Figure 1As shown, the oil and gas drilling downhole repeated vibration device also includes a base 7 fixedly connected to the bottom of the barrel 11, and the base 7 is suitable for vertically supporting the barrel 11. Therefore, the base 7 is supported and connected to the bottom of the barrel 11 to ensure the verticality of the barrel 1.

[0069] The specific use process of the oil and gas drilling downhole repeated vibration device in the embodiment of the utility model is as follows:

[0070] In the normal drilling state, the permanent magnet 22 is completely adsorbed on the lower surface of the armature 21, at which time the spring 5 is in a naturally extended state, and the shock head 4 is located at the upper part of the second inner stop 113 of the barrel 11; when shock is required, the rotation of the drilling tool is first stopped, and the gas buffer tank 123 is charged with pressure through the pneumatic drive assembly 6. The permanent magnet 22 is pushed away from the armature 21 by the air pressure, and the piston 31 and the shock head 4 are pushed downward as a whole, driving the shock head 4 to quickly move downward to impact, thereby achieving a shock. At this time, the spring 5 is gradually compressed, so that the spring 5 is compressed to store energy. When the impact action is completed, the spring 5 releases elastic kinetic energy, and the spring 5 returns to the naturally extended state. The piston drives the piston 31 upward under the action of the elastic restoring force of the spring 5, so that the permanent magnet 22 is adsorbed on the lower surface of the armature 21, and the above actions are repeated, and the next shock can be implemented.

[0071] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A downhole repeated vibration device for oil and gas drilling, characterized in that: include: The cylinder (1) comprises a cylinder body (11) and a cylinder cover (12) connected to each other, wherein a first inner stop (111), a first through hole (112) and a second inner stop (113) which are connected to each other are sequentially penetrated from top to bottom on the vertical center axis of the cylinder body (11); A magnetic attraction component (2) comprises an armature (21) located in a first inner stop (111) of the barrel (11) and a permanent magnet (22) located in a first through hole (112) of the barrel (11); A piston assembly (3) comprising a piston (31) adapted to be slidably connected to a first through hole (112) of the barrel (11), wherein a first receiving groove (313) for receiving the permanent magnet (22) is provided at the center of the top of the piston (31); A vibration head (4) is vertically inserted into the bottom center of the piston (31); A spring (5) is sleeved on the vibration-generating head (4), one end of the spring (5) is adapted to abut against the lower end surface of the piston (31), and the other end is adapted to abut against the end surface of the second inner stop (113); When the permanent magnet (22) and the armature (21) are driven to separate by an external force, the permanent magnet (22) drives the piston (31) to move downward, thereby driving the vibration head (4) to slide and vibrate.

2. The downhole repeated vibration device for oil and gas drilling according to claim 1, characterized in that: The piston assembly (3) further comprises a third sealing ring (32) and a piston ring (33) arranged on the outer circumference of the piston (31); a first ring groove (311) and a second ring groove (312) are provided in the outer circumferential direction of the piston (31), and the third sealing ring (32) and the piston ring (33) are respectively and correspondingly engaged in the first ring groove (311) and the second ring groove (312).

3. The downhole repeated vibration device for oil and gas drilling according to claim 1, characterized in that: The cylinder cover (12) comprises a cylinder cover flange end (121) and a cylinder cover body (122) which are integrally connected, and the cylinder cover flange end (121) is symmetrically arranged on the top of the cylinder cover body (122), and the cylinder cover body (122) is also provided with a gas buffer groove (123) opening toward the first through hole (112), and a second through hole (211) vertically passing through the center of the armature (21), and the top side of the second through hole (211) is connected to the gas buffer groove (123).

4. The downhole repeated vibration device for oil and gas drilling as claimed in claim 3, characterized in that: The invention also comprises a pneumatic drive assembly (6), wherein the pneumatic drive assembly (6) comprises a quick hose connector (61) connected to the cylinder cover (12), and a regulating valve and an air source which are sequentially connected to the quick hose connector (61), wherein the air source supplies air to the gas buffer groove (123) and the second through hole (211) through the regulating valve and the quick hose connector (61), so as to separate the permanent magnet (22) from the armature (21).

5. The downhole repeated vibration device for oil and gas drilling as claimed in claim 3, characterized in that: A first annular sealing groove (1221) is provided on the lower end surface of the cylinder cover body (122), and a first sealing ring (1222) is filled in the first annular sealing groove (1221).

6. The downhole repeated vibration device for oil and gas drilling as claimed in claim 3, characterized in that: A second annular sealing groove (1211) is provided on the lower end surface of the flange end (121) of the cylinder cover, and a second sealing ring (1212) is filled in the second annular sealing groove (1211).

7. The downhole repeated vibration device for oil and gas drilling according to claim 1, characterized in that: A first vertically arranged plug hole (314) is also provided at the center of the bottom of the piston (31); the vibration head (4) comprises a plug shaft (41) and an impact block (42) which are coaxially connected and integrally connected; the diameter of the impact block (42) is larger than the diameter of the plug shaft (41), and the plug shaft (41) is suitable for being inserted into the first plug hole (314); the top end face of the impact block (42) is suitable for abutting against the bottom end face of the piston (31).

8. The downhole repeated vibration device for oil and gas drilling according to any one of claims 1 to 7, characterized in that: The magnetic attraction component (2) also includes a magnetic isolation component (23) coated on the permanent magnet (22), and the magnetic isolation component (23) includes a magnetic isolation ring (231) sleeved on the outer circumference of the permanent magnet (22) and a magnetic isolation plate (232) adhered to the bottom of the permanent magnet (22).

9. The downhole repeated vibration device for oil and gas drilling according to claim 1, characterized in that: The cylinder body (11) and the cylinder cover (12) are fixedly connected via a plurality of evenly distributed annular connecting pieces (13).

10. The downhole repeated vibration device for oil and gas drilling according to claim 8, characterized in that: It also comprises a base (7) fixedly connected to the bottom of the cylinder body (11), and the base (7) is suitable for vertically supporting the cylinder body (11).

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