Wellhead packing box blowout preventer

Abstract

The utility model provides a blowout preventer for a wellhead packing box, and particularly relates to the technical field of oil exploitation. The wellhead packing box blowout prevention device comprises a blowout prevention box body, a packing sealing assembly, a pressing cap and a blowout prevention sealing assembly, a sucker rod penetrates through a longitudinal cavity channel of the blowout prevention box body, the packing sealing assembly is arranged in an upper end opening of the blowout prevention box body, the pressing cap is arranged outside the upper end opening of the blowout prevention box body in a sleeving mode, the pressing cap is tightly pressed on the packing sealing assembly in the blowout prevention box body, and the blowout prevention sealing assembly is arranged in the blowout prevention box body. A through hole is formed in the side wall of the pressing cap, the blowout prevention sealing assembly is arranged on the outer side wall of the pressing cap and is opposite to the through hole, the blowout prevention sealing assembly comprises a guide cylinder, a sealing valve ball and a compression spring, and when the oil rod is broken, the sealing valve ball loses support and is pushed into an oil way by the compression spring along the guide cylinder; and under the oil pressure, the sealing ring is matched with the upper sealing surface of the pressing cap cavity. The problem that in the prior art, when an oil pumping pipe in a wellhead packing box is broken, oil liquid is sprayed out due to the fact that an upper connector is not provided with a blowout prevention device, and resources are wasted is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a wellhead packing box blowout prevention device. Background Art

[0002] At present, in the process of extracting crude oil at the wellhead of an oil field, a bare rod reciprocating motion oil production equipment is generally used. In order to ensure the sealing of the wellhead and avoid crude oil leakage, a packing box mechanism is provided for the bare rod sealing. The packing box is sleeved on the outside of the bare rod of the oil pump, and the packing inside the packing box is tightly attached to the outer wall of the bare rod to play a sealing role.

[0003] Under normal circumstances, the pumping unit operates normally, and the wellhead packing box seals the oil transportation path. Under normal circumstances, this process can meet the needs of on-site operations. However, in actual use, when the pumping pipe breaks, there is no blowout prevention device at the upper interface, and the oil sprays out, causing a waste of resources. The oil is normally transported to the oil pipeline, and the well site pumping rod is not consistent with the center line of the oil pipeline. The traditional packing box cannot be adjusted at multiple angles. When the oil rod moves, it will deviate left and right, causing the rubber sealing packing to wear too quickly and need to be replaced frequently.

[0004] Based on the above problems, the present application provides a wellhead packing box blowout preventer, which, while meeting the process requirements, solves the problem of oil spraying out when the pumping pipe breaks due to the lack of a blowout preventer at the upper interface, causing waste of resources. Utility Model Content

[0005] The main purpose of the utility model is to provide a wellhead packing box blowout prevention device to solve the problem in the prior art that when the pumping pipe is broken, the oil sprays out because there is no blowout prevention device at the upper interface, resulting in waste of resources.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a wellhead packing box blowout prevention device, comprising: a blowout prevention box body, the blowout prevention box body is a "cross" shaped cavity structure, the sucker rod passes through the longitudinal cavity of the blowout prevention box body in the vertical direction, the longitudinal cavity has an upper port and a lower port opposite to each other in the vertical direction; a packing sealing assembly, which is arranged in the upper port of the blowout prevention box body and sleeved on the sucker rod, the packing sealing assembly is used to seal the gap between the outer side wall of the sucker rod and the upper port of the blowout prevention box body; a pressure cap, the pressure cap is detachably sleeved on the outer side of the upper port of the blowout prevention box body and on the sucker rod, the pressure cap is used to seal the packing sealing assembly The pressure cap is provided with a through hole on its side wall; a blowout prevention sealing assembly is arranged on the outer wall of the pressure cap and is opposite to the through hole, the blowout prevention sealing assembly comprises a guide cylinder, a sealing valve ball and a compression spring, the guide cylinder is arranged on the outer wall of the pressure cap and the inner cavity of the guide cylinder is opposite to and connected to the through hole, the sealing valve ball is movably arranged in the inner cavity of the guide cylinder and abuts against the outer wall of the sucker rod, the compression spring is arranged in the inner cavity of the guide cylinder, and the compression spring is used to squeeze the sealing valve ball along the axial direction of the guide cylinder so that the sealing valve ball is pressed against the outer wall of the sucker rod.

[0007] Furthermore, the inner wall of the upper port of the blowout preventer box body is a conical cavity structure, and the packing sealing assembly includes: a spiral packing, which is a conical structure matching the inner wall of the upper port of the blowout preventer box body, and the spiral packing is correspondingly arranged in the upper port of the blowout preventer box body; a packing pressure cap, which is arranged at the upper end of the spiral packing; a first sealing ring, which is arranged on the upper end surface of the packing pressure cap; wherein the lower end of the pressure cap has a connecting cavity recessed toward its interior; the side wall of the pressure cap connecting cavity is detachably sleeved on the upper port of the blowout preventer box body through a threaded structure so as to press the spiral packing into the upper port of the blowout preventer box body through the packing pressure cap, and the bottom wall of the pressure cap connecting cavity is sealed and connected to the upper end surface of the packing pressure cap through the first sealing ring.

[0008] Furthermore, the packing seal assembly also includes: a second sealing ring, which is sleeved on the outer side wall of the upper port of the blowout preventer box body; wherein the side wall of the pressure cap connecting cavity is sealed with the outer side wall of the upper port of the blowout preventer box body through the second sealing ring.

[0009] Furthermore, a handle is provided on the side wall of the pressing cap; wherein, the handle is used to rotate the pressing cap in a horizontal direction under the action of an external force so that the pressing cap is tightened with the upper port of the blowout prevention box body through a threaded structure.

[0010] Furthermore, the wellhead packing box blowout preventer device also includes: a transverse sealing assembly, which is divided into two groups. The two groups of transverse sealing assemblies are relatively arranged in two ports of the transverse cavity of the blowout preventer box body and abut against the sucker rod; wherein the two groups of transverse sealing assemblies are used to cooperate with the blowout preventer box body to perform transverse sealing on the sucker rod.

[0011] Furthermore, the transverse sealing assembly comprises: a sealing half-block seat, which is divided into two groups, and the two groups of sealing half-block seats are respectively movably arranged in the two ports of the transverse cavity of the blowout preventer box body and are sealed with the inner wall of the transverse cavity; a screw, which is rotatably arranged at the port of the transverse cavity around its axial direction through a threaded structure, and the front end of the screw and the rear end of the sealing half-block seat are relatively rotatably connected, and the rear end of the screw extends to the outside of the port of the transverse cavity; a sealing half-block, the front end of the sealing half-block has a semicircular sealing surface matching the outer side wall of the sucker rod; the rear end of the sealing half-block is fixedly connected to the front end of the sealing half-block seat; wherein, under the action of external force, the screws of the two groups of the transverse sealing assemblies drive the semicircular sealing surfaces of the two sealing half-blocks to slide and abut against the outer wall of the sucker rod through the sealing half-block seat and enclose an annular sealing surface to seal the sucker rod transversely.

[0012] Furthermore, the transverse sealing assembly also includes: a fixing screw, which is installed in the cavities on both sides of the blowout preventer box body; a half ring, which is fixed on the sealing half-block seat; a retaining ring, which is fixed between the half ring and the sealing half-block seat; a third sealing ring, which is an end face seal and is mounted on the sealing half-block seat; wherein, the fixing screw is used to limit the sealing half-block seat, the half ring is used to assist in rotating the screw to press the sealing half-block seat, and the retaining ring is used to fix the half ring on the sealing half-block seat.

[0013] Furthermore, the transverse sealing assembly also includes: guide pins, which are installed in the cavities on both sides of the blowout preventer box body and between the screw and the blowout preventer box body; nuts, which are installed on both sides of the blowout preventer box body and between the screw and the blowout preventer box body; wherein, the guide pins are used to fix the nuts, and the nuts are used to fix the screw.

[0014] Furthermore, the wellhead packing box blowout preventer device also includes: an oil pipe connecting assembly, the bottom end of which is installed on the oil pipe through a thread, and the top end of which is connected to the lower port of the longitudinal cavity of the blowout preventer box body; wherein, the oil pipe connecting assembly is used to connect the blowout preventer box body to form a closed delivery pipeline.

[0015] Furthermore, the oil pipe connecting assembly includes: a packing box connecting short pipe, the upper port of which is installed on the lower port of the longitudinal cavity of the blowout preventer box body through a thread; a hose, the upper port of which is installed on the lower port of the packing box connecting short pipe; an oil pipe connecting short pipe, the upper port of which is installed on the lower port of the hose, and the lower port of the oil pipe connecting short pipe is connected to the oil pipe; wherein, the packing box connecting short pipe is used to connect with the blowout preventer box body, the hose is used to connect the packing box connecting short pipe with the oil pipe connecting short pipe, and the oil pipe connecting short pipe is used to connect with the oil pipe.

[0016] The wellhead packing box blowout prevention device using the technical solution of the utility model comprises: a blowout prevention box body 10, a packing sealing assembly 30, a pressure cap 40, and a blowout prevention sealing assembly 50. The blowout prevention box body 10 is a "cross" shaped cavity structure. The sucker rod 20 passes through the longitudinal cavity of the blowout prevention box body 10 in the vertical direction. The longitudinal cavity has an upper port and a lower port opposite to each other in the vertical direction; the packing sealing assembly 30 is arranged in the upper port of the blowout prevention box body 10 and is sleeved on the sucker rod 20. The packing sealing assembly 30 is used to seal the gap between the outer side wall of the sucker rod 20 and the upper port of the blowout prevention box body 10; the pressure cap 40 is detachably sleeved on the outer side of the upper port of the blowout prevention box body 10 and on the sucker rod 20. The pressure cap 40 is used to seal the packing The root sealing assembly 30 is pressed tightly in the upper port of the blowout prevention box body 10; a through hole is opened on the side wall of the pressure cap 40; the blowout prevention sealing assembly 50 is arranged on the outer side wall of the pressure cap 40 and opposite to the through hole, the blowout prevention sealing assembly 50 includes a guide cylinder 51, a sealing valve ball 52 and a compression spring 53, the guide cylinder 51 is arranged on the outer side wall of the pressure cap 40 and the inner cavity of the guide cylinder 51 is opposite to and connected with the through hole, the sealing valve ball 52 is movably arranged in the inner cavity of the guide cylinder 51 and abuts against the outer side wall of the sucker rod 20, the compression spring 53 is arranged in the inner cavity of the guide cylinder 51, and the compression spring 53 is used to squeeze the sealing valve ball 52 along the axial direction of the guide cylinder 51 so that the sealing valve ball 52 is pressed tightly against the outer side wall of the sucker rod 20. When the sucker rod breaks, the spin-pressed pressure cap 40 is tightly connected to the blowout prevention box body 10 through threads to form a first sealing surface to prevent oil from overflowing. At the same time, the pressure cap 40 also presses the packing seal assembly 30 downward to form a second sealing surface to further prevent oil from overflowing. Figure 2 As shown, the sealing valve ball 52 in the anti-blowout sealing assembly 50 loses its support, and the sealing valve ball 52 is pushed into the oil circuit by the compression spring 53, and cooperates with the upper sealing surface of the cavity of the pressure cap 40 under the oil pressure. This solves the problem in the prior art that when the oil pumping pipe breaks, the oil sprays out because there is no anti-blowout device on the upper interface, causing waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of a wellhead packing box blowout prevention device that can be selected according to an embodiment of the utility model;

[0019] Figure 2 It is a partial structural schematic diagram of a wellhead packing box blowout prevention device that can be selected according to an embodiment of the utility model;

[0020] The above drawings include the following reference numerals:

[0021] 20. Sucker rod; 30. Packing seal assembly; 40. Pressure cap; 41. Handle; 31. First seal ring; 32. Packing pressure cap; 33. Spiral packing; 10. Blowout prevention box body; 34. Second seal ring; 60. Transverse seal assembly; 61. Third seal ring; 62. Nut; 63. Half ring; 64. Retaining ring; 65. Screw; 66. Sealing half block seat; 67. Set screw; 68. Guide pin; 69. Sealing half block; 70. Oil pipe connection assembly; 71. Packing box connecting short pipe; 72. Hose; 73. Oil pipe connecting short pipe; 50. Blowout prevention seal assembly; 51. Guide cylinder; 52. Sealing valve ball; 53. Compression spring. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] According to the wellhead packing box blowout prevention device of the utility model, Figure 1As shown, it includes a blowout preventer box body 10, a packing seal assembly 30, a pressure cap 40, and a blowout preventer seal assembly 50. The blowout preventer box body 10 is a "cross" shaped cavity structure. The sucker rod 20 passes through the longitudinal cavity of the blowout preventer box body 10 in the vertical direction. The longitudinal cavity has an upper port and a lower port opposite to each other in the vertical direction; the packing seal assembly 30 is arranged in the upper port of the blowout preventer box body 10 and is sleeved on the sucker rod 20. The packing seal assembly 30 is used to seal the gap between the outer side wall of the sucker rod 20 and the upper port of the blowout preventer box body 10; the pressure cap 40 is detachably sleeved on the outer side of the upper port of the blowout preventer box body 10 and the sucker rod 20. The pressure cap 40 is used to press the packing seal assembly 30 tightly on In the upper port of the blowout prevention box body 10; a through hole is opened on the side wall of the pressure cap 40; the blowout prevention sealing assembly 50 is arranged on the outer wall of the pressure cap 40 and opposite to the through hole, and the blowout prevention sealing assembly 50 includes a guide tube 51, a sealing valve ball 52 and a compression spring 53. The guide tube 51 is arranged on the outer wall of the pressure cap 40 and the inner cavity of the guide tube 51 is opposite to and connected to the through hole. The sealing valve ball 52 is movably arranged in the inner cavity of the guide tube 51 and abuts against the outer wall of the sucker rod 20. The compression spring 53 is arranged in the inner cavity of the guide tube 51. The compression spring 53 is used to squeeze the sealing valve ball 52 along the axial direction of the guide tube 51 so that the sealing valve ball 52 is pressed against the outer wall of the sucker rod 20. When the sucker rod breaks, the spin-pressed pressure cap 40 is tightly connected to the blowout prevention box body 10 through threads to form a first sealing surface to prevent oil from overflowing. At the same time, the pressure cap 40 also presses the packing seal assembly 30 downward to form a second sealing surface to further prevent oil from overflowing. Figure 2 As shown, the sealing valve ball 52 in the anti-blowout sealing assembly 50 loses its support, and the sealing valve ball 52 is pushed into the oil circuit by the compression spring 53, and cooperates with the upper sealing surface of the cavity of the pressure cap 40 under the oil pressure. This solves the problem in the prior art that when the oil pumping pipe breaks, the oil sprays out because there is no anti-blowout device on the upper interface, causing waste of resources.

[0024] When implementing it, Figure 1As shown, the inner wall of the upper port of the blowout preventer box body 10 is a tapered cavity structure, and the packing sealing assembly 30 includes a spiral packing 33, a packing pressure cap 32 and a first sealing ring 31. The spiral packing 33 is a tapered structure matching the inner wall of the upper port of the blowout preventer box body 10, and the spiral packing 33 is correspondingly arranged in the upper port of the blowout preventer box body 10; the packing pressure cap 32 is arranged at the upper end of the spiral packing 33; the first sealing ring 31 is arranged on the upper end surface of the spiral packing 33; wherein, the lower end of the pressure cap 40 has a connecting cavity recessed toward its interior; the side wall of the connecting cavity of the pressure cap 40 is detachably sleeved on the upper port of the blowout preventer box body 10 through a threaded structure so as to press the spiral packing 33 tightly inside the upper port of the blowout preventer box body 10 through the spiral packing 33, and the bottom wall of the connecting cavity of the pressure cap 40 is sealed and connected with the upper end surface of the packing pressure cap 32 through the first sealing ring 31. It can be seen that when the pressure cap 40 presses the packing pressure cap 32 downwards, the packing pressure cap 32 presses the spiral packing 33 downwards, so that the spiral packing 33 and the spray-out prevention box body 10 are more tightly connected through threads. At the same time, the first sealing ring 31 can also further seal the gap between the pressure cap 40 and the packing pressure cap 32 to prevent oil from leaking out of the gap. In summary, the spiral packing 33, the packing pressure cap 32 and the first sealing ring 31 can cooperate with other components to form a tight sealing surface, thereby preventing oil from overflowing.

[0025] Specifically, Figure 1 As shown, the packing seal assembly 30 further includes: a second sealing ring 34, which is sleeved on the outer side wall of the upper port of the blowout prevention box body 10; wherein, the side wall of the connection cavity of the pressure cap 40 is sealed with the outer side wall of the upper port of the blowout prevention box body 10 through the second sealing ring 34. It can be understood that when the pressure cap 40 is rotated downward through the thread to be tightly connected with the blowout prevention box body 10, the second sealing ring 34 further seals the gap between the pressure cap 40 and the blowout prevention box body 10, thereby preventing leakage of oil.

[0026] Specifically, Figure 1 As shown, a handle 41 is provided on the side wall of the pressure cap 40; wherein, the handle 41 is used to rotate the pressure cap 40 in the horizontal direction under the action of an external force so that the pressure cap 40 is tightened with the upper port of the blowout preventer box body 10 through a threaded structure. The connection between the pressure cap 40 and the handle 41 can be connected by welding or by a threaded structure, and the specific connection method is not limited here. It can be understood that during the operation of the wellhead packing box blowout preventer, the connection of each component becomes loose due to vibration, so that the sealing surface is no longer tight. By rotating the pressure cap 40 by the handle 41 so that the pressure cap 40 is tightened with the upper port of the blowout preventer box body 10 through a threaded structure, the components in the wellhead packing box blowout preventer can be tightly connected again, thereby achieving the effect of preventing oil leakage.

[0027] Specifically, Figure 1As shown, the wellhead packing box blowout prevention device also includes: a transverse sealing assembly 60, which is divided into two groups. The two groups of transverse sealing assemblies 60 are relatively arranged in two ports of the transverse cavity of the blowout prevention box body 10 and abut against the sucker rod 20; wherein, the two groups of transverse sealing assemblies 60 are used to cooperate with the blowout prevention box body 10 to perform transverse sealing on the sucker rod 20. It can be understood that the transverse sealing assembly 60 and the blowout prevention box body 10 are connected and fixed by a screw structure. The transverse sealing assembly 60 is divided into two groups, and the two groups cooperate with each other to form a circular ring to embrace the sucker rod 20 to achieve the effect of fixing the sucker rod 20, and the two groups of transverse sealing assemblies 60 and the blowout prevention box body 10 form a tight sealing surface to prevent oil leakage.

[0028] Specifically, Figure 1 As shown, the transverse sealing assembly 60 includes: a sealing half-block seat 66, a screw 65, and a sealing half-block 69. The sealing half-block seat 66 is divided into two groups. The two groups of sealing half-block seats 66 are respectively movably arranged in the two ports of the transverse cavity of the blowout prevention box body 10 and are sealed and connected to the inner wall of the transverse cavity; the screw 65 is rotatably arranged at the port of the transverse cavity around its axial direction through a threaded structure, and the front end of the screw 65 is relatively rotatably connected to the rear end of the sealing half-block seat 66, and the rear end of the screw 65 extends to the outside of the port of the transverse cavity; the front end of the sealing half-block 69 has a semicircular sealing surface matching the outer wall of the sucker rod 20; the rear end of the sealing half-block 69 is fixedly connected to the front end of the sealing half-block seat 66; wherein, the screws 65 of the two groups of transverse sealing assemblies 60 drive the semicircular sealing surfaces of the two sealing half-blocks 69 to slide and abut against the outer wall of the sucker rod 20 through the sealing half-block seat 66 under the action of external force and enclose an annular sealing surface to seal the sucker rod 20 transversely. It can be understood that the present technical solution can tighten the screw 65 under the action of external force, and press the semicircular sealing surfaces of the two sealing half blocks 69 through the sealing half block seat 66 to abut against the outer wall of the sucker rod 20 and enclose an annular sealing surface to achieve a transverse sealing effect.

[0029] Specifically, Figure 1As shown, the transverse sealing assembly 60 also includes: a fixing screw 67, a half ring 63, a ring 64, and a third sealing ring 61. The fixing screw 67 is installed in the cavities on both sides of the blowout preventer box body 10; the half ring 63 is fixed on the sealing half-block seat 66; the retaining ring 64 is fixed between the half ring 63 and the sealing half-block seat 66; the third sealing ring 61 is an end face seal and is sleeved on the sealing half-block seat 66; wherein the fixing screw 67 is used to limit the sealing half-block seat 66, the half ring 63 is used to assist the rotating screw 65 to press the sealing half-block seat 66, and the retaining ring 64 is used to fix the half ring 63 on the sealing half-block seat 66. It can be understood that the present technical solution limits the sealing half-block seat 66 by means of a fixing screw 67, and then uses a retaining ring 64 to fix the half-ring 63 on the sealing half-block seat 66, and then uses the half-ring 63 to assist the rotating screw 65 in pressing the sealing half-block seat 66, and finally the third sealing ring 61 is mounted on the sealing half-block seat 66, so that the sealing half-block 69 can form a tight sealing surface with the blowout prevention box body 10, thereby achieving the effect of preventing oil from leaking from the sealing half-block 69.

[0030] Specifically, Figure 1 As shown, the transverse sealing assembly 60 further includes: a guide pin 68 and a nut 62. The guide pin 68 is installed in the cavities on both sides of the blowout prevention box body 10, and can be installed between the screw 65 and the blowout prevention box body 10 through a threaded structure; the nut 62 is installed on both sides of the blowout prevention box body 10, and can be installed between the screw 65 and the blowout prevention box body 10 through a threaded structure; wherein the guide pin 68 is used to fix the nut 62, and the nut 62 is used to fix the screw 65. It can be understood that the technical solution can fix the nut 62 through the guide pin 68, and then fix the screw 65 through the nut 62, so as to achieve the effect of fixing the screw 65.

[0031] Specifically, Figure 1 As shown, the wellhead packing box blowout prevention device also includes: an oil pipe connection assembly 70, the bottom end of the oil pipe connection assembly 70 is installed on the oil pipe by threading, and the top end of the oil pipe connection assembly 70 is connected to the lower end of the longitudinal cavity of the blowout prevention box body 10; wherein, the oil pipe connection assembly 70 is used to connect the blowout prevention box body 10 to form a closed delivery pipeline. It can be understood that the bottom end of the oil pipe connection assembly 70 is installed on the oil pipe by threading, and the top end of the oil pipe connection assembly 70 is connected to the lower end of the longitudinal cavity of the blowout prevention box body 10 by a threaded structure, thereby forming a sealed pipeline, so as to achieve the purpose of safely delivering oil to the blowout prevention box body 10.

[0032] Specifically, Figure 1As shown, the oil pipe connection assembly 70 includes: a packing box connection short tube 71, a hose 72, and an oil pipe connection short tube 73. The upper end of the packing box connection short tube 71 is installed on the lower end of the longitudinal cavity of the blowout preventer box body 10 through a thread; the upper end of the hose 72 is installed on the lower end of the packing box connection short tube 71; the upper end of the oil pipe connection short tube 73 is installed on the lower end of the hose 72, and the lower end of the oil pipe connection short tube 73 is connected to the oil pipe; wherein, the packing box connection short tube 71 is used to connect with the blowout preventer box body 10, the hose 72 is used to connect the packing box connection short tube 71 with the oil pipe connection short tube 73, and the oil pipe connection short tube 73 is used to connect with the oil pipe. It can be understood that when the sucker rod 20 moves up and down and shakes left and right, the hose 72 is deformed by force, so that the center of the wellhead packing box blowout preventer device is always synchronized with the center of the sucker rod 20, which can slow down the wear rate of the components and extend the component replacement cycle;

[0033] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wellhead packing box blowout prevention device, characterized in that: include: A blowout prevention box body (10), the blowout prevention box body (10) being a "cross" shaped cavity structure, the sucker rod (20) passing through a longitudinal cavity of the blowout prevention box body (10) in a vertical direction, the longitudinal cavity having an upper port and a lower port opposite to each other in the vertical direction; A packing seal assembly (30) is arranged in the upper end of the blowout prevention box body (10) and sleeved on the sucker rod (20), and the packing seal assembly (30) is used to seal the gap between the outer side wall of the sucker rod (20) and the upper end of the blowout prevention box body (10); a pressing cap (40), the pressing cap (40) being detachably sleeved on the outside of the upper port of the blowout prevention box body (10) and on the sucker rod (20), the pressing cap (40) being used to press the packing seal assembly (30) into the upper port of the blowout prevention box body (10); a through hole is provided on a side wall of the pressing cap (40); The blowout-proof sealing assembly (50) is arranged on the outer wall of the pressure cap (40) and opposite to the through hole. The blowout-proof sealing assembly (50) comprises a guide tube (51), a sealing valve ball (52) and a compression spring (53). The guide tube (51) is arranged on the outer wall of the pressure cap (40) and the inner cavity of the guide tube (51) is opposite to and connected to the through hole. The sealing valve ball (52) is movably arranged in the inner cavity of the guide tube (51) and abuts against the outer wall of the sucker rod (20). The compression spring (53) is arranged in the inner cavity of the guide tube (51). The compression spring (53) is used to squeeze the sealing valve ball (52) along the axial direction of the guide tube (51) so that the sealing valve ball (52) is pressed against the outer wall of the sucker rod (20).

2. The wellhead packing box blowout prevention device according to claim 1 is characterized in that: The inner wall of the upper port of the blowout prevention box body (10) is a tapered cavity structure, and the packing seal assembly (30) comprises: A spiral packing (33), wherein the spiral packing (33) is a conical structure matching the inner wall of the upper port of the blowout prevention box body (10), and the spiral packing (33) is correspondingly arranged in the upper port of the blowout prevention box body (10); A packing pressure cap (32) is arranged at the upper end of the spiral packing (33); A first sealing ring (31) is arranged on the upper end surface of the packing pressure cap (32); The lower end of the pressure cap (40) has a connecting cavity recessed toward the inside thereof; the side wall of the connecting cavity of the pressure cap (40) is detachably sleeved on the upper port of the blowout prevention box body (10) through a threaded structure so that the spiral packing (33) is pressed tightly inside the upper port of the blowout prevention box body (10) through the packing pressure cap (32); and the bottom wall of the connecting cavity of the pressure cap (40) is sealed and connected to the upper end surface of the packing pressure cap (32) through the first sealing ring (31).

3. The wellhead packing box blowout prevention device according to claim 2 is characterized in that: The packing seal assembly (30) further comprises: A second sealing ring (34), the second sealing ring (34) being sleeved on the outer side wall of the upper port of the blowout prevention box body (10); The side wall of the connection cavity of the pressure cap (40) is sealed with the outer side wall of the upper port of the blowout prevention box body (10) through the second sealing ring (34).

4. The wellhead packing box blowout prevention device according to claim 2, characterized in that: A handle (41) is provided on the side wall of the pressing cap (40); Wherein, the handle (41) is used to rotate the pressing cap (40) in a horizontal direction under the action of an external force so that the pressing cap (40) is tightened with the upper port of the blowout prevention box body (10) through a threaded structure.

5. The wellhead packing box blowout prevention device according to claim 1, characterized in that: The wellhead packing box blowout prevention device also includes: A transverse sealing assembly (60), wherein the transverse sealing assembly (60) is composed of two groups, and the two groups of transverse sealing assemblies (60) are arranged oppositely in two ports of the transverse cavity of the blowout prevention box body (10) and abut against the sucker rod (20); Wherein, the two groups of transverse sealing assemblies (60) are used to cooperate with the blowout prevention box body (10) to perform transverse sealing on the sucker rod (20).

6. The wellhead packing box blowout prevention device according to claim 5, characterized in that: The transverse sealing assembly (60) comprises: Sealing half-block seats (66), the sealing half-block seats (66) are in two groups, the two groups of sealing half-block seats (66) are respectively and movably arranged in two ports of the transverse cavity of the blowout prevention box body (10) and are sealed and connected to the inner wall of the transverse cavity; A screw (65), the screw (65) being rotatably arranged at the port of the transverse cavity around its axis through a thread structure, the front end of the screw (65) being relatively rotatably connected to the rear end of the sealing half-block seat (66), and the rear end of the screw (65) extending to the outside of the port of the transverse cavity; A sealing half block (69), wherein the front end of the sealing half block (69) has a semicircular sealing surface matching the outer side wall of the sucker rod (20); the rear end of the sealing half block (69) is fixedly connected to the front end of the sealing half block seat (66); Wherein, under the action of external force, the screws (65) of the two groups of transverse sealing assemblies (60) drive the semicircular sealing surfaces of the two sealing half blocks (69) through the sealing half block seats (66) to slide against the outer walls of the sucker rod (20) and enclose an annular sealing surface to transversely seal the sucker rod (20).

7. The wellhead packing box blowout prevention device according to claim 6, characterized in that: The transverse sealing assembly (60) further comprises: A fixing screw (67), wherein the fixing screw (67) is installed in the cavities on both sides of the blowout prevention box body (10); A half ring (63), wherein the half ring (63) is fixed on the sealing half block seat (66); A retaining ring (64), the retaining ring (64) being fixed between the half ring (63) and the sealing half block seat (66); A third sealing ring (61), the third sealing ring (61) is an end face seal and is sleeved on the sealing half block seat (66); The fixing screw (67) is used to limit the sealing half-block seat (66), the half ring (63) is used to assist in rotating the screw (65) to press the sealing half-block seat (66), and the retaining ring (64) is used to fix the half ring (63) on the sealing half-block seat (66).

8. The wellhead packing box blowout prevention device according to claim 7 is characterized in that The transverse sealing assembly (60) further comprises: Guide pins (68), the guide pins (68) are installed in cavities on both sides of the blowout prevention box body (10), specifically, between the screw rod (65) and the blowout prevention box body (10); Nuts (62), the nuts (62) being installed on both sides of the blowout prevention box body (10), specifically installed between the screw rod (65) and the blowout prevention box body (10); The guide pin (68) is used to fix the nut (62), and the nut (62) is used to fix the screw rod (65).

9. The wellhead packing box blowout prevention device according to claim 1, characterized in that The wellhead packing box blowout prevention device also includes: An oil pipe connection assembly (70), the bottom end of which is mounted on the oil pipe via threads, and the top end of which is connected to the lower end of the longitudinal cavity of the blowout prevention box body (10); The oil pipe connection assembly (70) is used to connect the blowout prevention box body (10) to form a closed delivery pipeline.

10. The wellhead packing box blowout prevention device according to claim 9, characterized in that: The oil pipe connection assembly (70) comprises: A packing box connecting short pipe (71), the upper end of which is threadably mounted on the lower end of the longitudinal cavity of the blowout prevention box body (10); A hose (72), the upper end of the hose (72) being mounted on the lower end of the packing box connecting short tube (71); An oil pipe connecting short pipe (73), the upper end of the oil pipe connecting short pipe (73) is installed on the lower end of the hose (72), and the lower end of the oil pipe connecting short pipe (73) is connected to the oil pipe; The packing box connecting short tube (71) is used to be connected to the blowout prevention box body (10), the hose (72) is used to connect the packing box connecting short tube (71) with the oil pipe connecting short tube (73), and the oil pipe connecting short tube (73) is used to be connected to the oil pipe.

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