A pressure test plug for an internal blowout preventer

Abstract

The application discloses an inner blowout preventer pressure test plug and belongs to the technical field of oil drilling. The inner blowout preventer pressure test plug comprises a male plug unit connected to the protruding end of an inner blowout preventer and a female plug unit connected to the inner concave end of the inner blowout preventer. The male plug unit comprises a male connecting sleeve (2), a male makeup bushing and a male makeup bushing, which are coaxially sleeved from outside to inside. One end of the inner hole of the male connecting sleeve is threadedly connected to the protruding end of the inner blowout preventer, and the other end is threadedly connected to the male makeup bushing. The female plug unit comprises a female connecting body threadedly connected to the inner concave end of the inner blowout preventer. The female connecting body is sleeved with a female makeup bushing. The wall surface of the female makeup bushing is provided with a sealing device for contacting the inner wall surface of the inner concave end of the inner blowout preventer to realize sealing. The male plug and the female plug are respectively composed of three small parts, which are light in weight, easy to assemble and disassemble, save labor consumption and obviously improve the pressure test efficiency of the inner blowout preventer compared with the existing device and method.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling technology and relates to a pressure test plug for internal blowout preventers. Background Technology

[0002] The drilling string mainly consists of angular drill pipe, drill pipe, drill collars, and internal blowout preventer (BOP) connected in series via threads at both ends. It has an internal through-flow channel along its axis and serves as the tubing string for achieving drilling depth. The BOP is a cylindrical short section connected to the drilling string via connecting threads. It also has an internal channel along its axis, with one-way opening and closing valves to allow drilling fluid to flow downwards through the internal channel and to prevent drilling fluid from flowing upwards through the internal channel. Existing BOPs, according to GB / T 25429 "Specification for Internal BOPs," require a sealing pressure test before leaving the factory. Specifically, the valve body and valve core of the BOP undergo sealing pressure tests separately before shipment. Only those that pass the test are permitted for use. During the sealing pressure test, the threaded portions at both ends of the BOP need to be sealed to form a reliably sealed integral container capable of withstanding internal pressures of 105 MPa or higher.

[0003] When conducting sealing pressure tests on internal blowout preventers, the existing methods for sealing the threaded ends include three types: using a complex press, using a pressure cap, and using a pressure plug. The press method is inefficient due to the complexity of the equipment; the pressure cap method is inefficient due to the difficulty in attaching and removing the pressure cap, and it still doesn't solve the problem of quickly attaching and detaching the plug during the pressure test of the internal blowout preventer. While the Chinese utility model patent application number 202021007484.X, entitled "A Simple Pressure Test Short Section for Internal Blowout Preventers," only addresses the connection problem during the pressure test of the internal blowout preventer, it doesn't effectively solve the problem of achieving high-pressure sealing and quick attachment / detachment on-site. The existing tools and methods for sealing the threaded ends of internal blowout preventers cannot simultaneously ensure easy disassembly and meet the requirements of high-pressure sealing, limiting the pressure test efficiency of the internal blowout preventer and posing certain difficulties for production support. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that the sealing device for pressure testing of internal blowout preventers in the prior art cannot meet the working conditions of high-pressure sealing while ensuring convenient disassembly, and to provide a plug for pressure testing of internal blowout preventers.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] In a first aspect, the present invention provides a pressure test plug for an internal blowout preventer, comprising a male plug unit connected to the protruding end of the internal blowout preventer and a female plug unit connected to the concave end of the internal blowout preventer.

[0007] The male plug unit includes a male connecting sleeve, a male core clamping sleeve, and a male core, which are coaxially sleeved from the outside to the inside. One end of the inner hole of the male connecting sleeve is threaded to the protruding end of the inner blowout preventer, and the other end is threaded to the male core clamping sleeve. The male core clamping sleeve is used to press the male core onto the end face of the protruding end of the inner blowout preventer to achieve a seal. The male core is axially provided with a male core water eye coaxial with the water eye of the inner blowout preventer, and sealing devices are provided on both end faces of the male core.

[0008] The female plug unit includes a female connector body threaded to the concave end of the internal blowout preventer. A female nozzle is fitted onto the female connector body, and a sealing device is provided on the wall surface of the female nozzle for contacting the inner wall surface of the concave end of the internal blowout preventer to achieve a seal. A female nozzle pressure cap is also fitted onto the female connector body, and sealing devices are provided on both end faces of the female nozzle pressure cap. Both the female connector body and the female nozzle pressure cap are axially provided with water holes coaxial with the water holes of the internal blowout preventer. The unused ends of the female nozzle pressure cap and the male nozzle are used to connect to the pressure test pipeline.

[0009] A further improvement of the present invention is that:

[0010] Both the female and male filler caps have threads on their unused ends for connecting to the test pipeline.

[0011] The male connecting sleeve is a cylindrical section with an axially arranged inner hole; one end of the inner hole is provided with a connecting sleeve female thread that mates with the thread on the protruding end of the blowout preventer, and the other end is provided with a connecting sleeve right thread; the male connecting sleeve is also provided with a rotating hole on the outer wall surface on the same side as the connecting sleeve right thread.

[0012] The male core compression sleeve is axially provided with a male core compression sleeve inner hole; one end of the male core compression sleeve is provided with a male core compression sleeve thread that mates with the right thread of the connecting sleeve on its outer surface, and the other end is provided with a male core compression sleeve protrusion; the end face of the male core compression sleeve near the male core compression sleeve thread is the male core compression sleeve end face.

[0013] The male nozzle has a first sealing O-ring groove on one end face and a second sealing O-ring groove on the other end face; the male nozzle has an axial water eye; a protrusion is provided on the outer wall of the end of the male nozzle near the second sealing O-ring groove, forming a pressing end face that contacts the end face of the male nozzle pressing sleeve; a male nozzle thread is provided on the outer wall of the end of the male nozzle near the first sealing O-ring groove for connecting the pressure test pipeline.

[0014] The female connector is provided with a water eye in the axial direction; the female connector is composed of two cylindrical sections with progressively decreasing diameters; the outer wall of the cylindrical section with the largest diameter is provided with a right thread of the female connector that mates with the concave end thread of the internal anti-spray tool, and the cylindrical section with the middle diameter is provided with a left thread of the female connector; the cylindrical section with the middle diameter is also connected to a protruding section of the female connector.

[0015] The female core is axially provided with a female core inner hole that mates with the left thread of the female connector; the outer wall surface of the female core is a female core conical surface that mates with the inner wall surface of the concave end of the internal blowout preventer; a female core sealing O-ring groove is provided on the female core conical surface.

[0016] The female core pressure cap is axially provided with a female core water hole; the female core pressure cap end face that contacts the female core is provided with a second sealing O-ring groove; the end of the female core pressure cap near the end face of the female core pressure cap is axially provided with a groove, and the inner wall of the groove is provided with an internal thread of the female core pressure cap that mates with the left thread of the female connector; the middle outer wall of the female core pressure cap is provided with a female core protrusion section; the outer wall of the other end of the female core pressure cap away from the end face of the female core pressure cap is provided with an external thread of the female core pressure cap, and the other end face is provided with a first sealing O-ring groove of the female core pressure cap.

[0017] The sealing device is a sealing O-ring.

[0018] The cross-sections of the male and female core compression sleeve protrusions are hexagonal.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention discloses a pressure test plug for an internal blowout preventer (BOP), comprising a male connecting sleeve, a male core clamping sleeve, a male core, a female connecting body, a female core, a female core pressure cap, and a sealing O-ring. The male core clamping sleeve is fitted onto the male core, and its thread is screwed onto the male connecting sleeve, which in turn is screwed onto the male thread of the internal BOP. A sealing O-ring is installed between the male core and the internal BOP, forming the male plug. The male thread of the female connecting body is screwed onto the female thread of the internal BOP, and the female core is fitted onto the female connecting body. The thread of the female core pressure cap is connected to the left thread of the female connecting body, and a sealing O-ring is installed between the female core and the internal BOP, as well as between the female core and the female core pressure cap, forming the female plug. The external threads of the male core and the female core pressure cap connect to the test pipeline, enabling a sealing pressure test of the internal BOP. The sealed O-ring does not rotate, is not easily damaged, and has a long service life; the male and female plugs are each composed of three small parts, which are lightweight, easy to assemble and disassemble, and save manpower. Compared with existing devices and methods, it significantly improves the pressure testing efficiency of internal blowout preventers. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the assembly structure of the pressure test plug for the internal blowout preventer in this invention;

[0023] Figure 2 This is a schematic diagram of the internal blowout preventer in this invention;

[0024] Figure 3 This is a schematic diagram of the male connecting sleeve structure of the pressure test plug of the internal blowout preventer in this invention;

[0025] Figure 4 This is a schematic diagram of the male core clamping sleeve structure of the pressure test plug of the internal blowout preventer in this invention;

[0026] Figure 5 This is a schematic diagram of the male core structure of the pressure test plug for the internal blowout preventer in this invention;

[0027] Figure 6 This is a schematic diagram of the female connector structure of the pressure test plug for the internal blowout preventer in this invention;

[0028] Figure 7 This is a schematic diagram of the core structure of the pressure test plug for the internal blowout preventer in this invention;

[0029] Figure 8 This is a schematic diagram of the core pressure cap structure of the pressure test plug for the internal blowout preventer in this invention.

[0030] Wherein: 1-Inner blowout preventer; 2-Male connecting sleeve; 3-Male core clamping sleeve; 4-Male core; 5-Male core first sealing O-ring; 6-Male core second sealing O-ring; 7-Female connecting body; 8-Female core; 9-Female core sealing O-ring; 10-Female core pressure cap second sealing O-ring; 11-Female core pressure cap; 12-Female core pressure cap first sealing O-ring; 101-Female thread boring tapered surface; 102-Inner blowout preventer female thread; 103-Water eye; 104-Valve; 105-Inner blowout preventer male thread; 106-Inner blowout preventer male thread small end face; 201-Connecting sleeve female thread; 202-Connecting sleeve right thread; 203-Rotating hole; 301-Male core clamping sleeve thread; 302-Male core clamping sleeve end face; 303-Male core clamping sleeve protruding section; 304-Male core 401 - Inner bore of the clamping sleeve; 402 - Clamping end face; 403 - Outer cylinder; 403 - Male nozzle thread; 404 - First sealing O-ring groove of the male nozzle; 405 - End face of the male nozzle; 406 - Water eye of the male nozzle; 407 - Second sealing O-ring groove of the male nozzle; 701 - Left thread of the female connector; 702 - Right thread of the female connector; 703 - Female nozzle of the female connector; 704 - Water eye of the female connector; 801 - Female core seal O-ring groove; 802 - Female core conical surface; 803 - Female core inner hole; 804 - Female core end face; 111 - Female core protruding section; 112 - Female core pressure cap internal thread; 113 - Female core pressure cap end face; 114 - Female core pressure cap second seal O-ring groove; 115 - Female core pressure cap external thread; 116 - Female core water hole; 117 - Female core pressure cap first seal O-ring groove. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings:

[0038] See Figure 1This invention discloses a pressure test plug for an internal blowout preventer (BOP), comprising a male plug unit connected to the protruding end of the BOP and a female plug unit connected to the concave end of the BOP. The male plug unit includes a male connecting sleeve 2, a male core clamping sleeve 3, and a male core 4, coaxially sleeved from the outside to the inside. One end of the inner hole of the male connecting sleeve 2 is threaded to the male thread 105 of the protruding end of the BOP, and the other end is threaded to the male core clamping sleeve 3. The male core clamping sleeve 3 is used to press the male core 4 onto the end face of the protruding end of the BOP to achieve a seal. The male core 4 is axially provided with a male core water inlet 4 coaxial with the water inlet of the BOP. 06. Both ends of the male nozzle 4 are provided with sealing devices; the female plug unit includes a female connector 7 that is threadedly connected to the concave end of the internal blowout preventer, a female nozzle 8 is fitted on the female connector 7, and a sealing O-ring groove is provided on the wall surface of the female nozzle 8 for contacting the inner wall surface of the concave end of the internal blowout preventer to achieve sealing; a female nozzle pressure cap 11 is also fitted on the female connector 7, and both ends of the female nozzle pressure cap 11 are provided with sealing devices; both the female connector 7 and the female nozzle pressure cap 11 are axially provided with water eyes coaxial with the water eyes 103 of the internal blowout preventer; the unused ends of the female nozzle pressure cap 11 and the male nozzle 4 are both connected to the test pressure pipeline by threads.

[0039] See Figure 2 The internal blowout preventer (BOP) using the pressure test plug of this invention is a cylindrical short section connected to the drill string via a connecting thread. An internal BOP water eye 103 is provided along the axial direction. A one-way opening and closing valve 104 is provided in the water eye 103 to allow drilling fluid to flow downwards through the internal channels of the drill string and to prevent drilling fluid from flowing upwards through the internal channels of the drill string. One end of the internal BOP is a protruding end with a male thread 105 and a small end face 106 of the male thread. The other end is a concave end with an inner wall surface 101 of a female thread boring cone and a female thread 102.

[0040] See Figure 3 This is a schematic diagram of the male connecting sleeve 2 in a pressure test plug for an internal blowout preventer disclosed in an embodiment of the present invention. The male connecting sleeve 2 is a cylindrical section with an axially arranged inner hole. One end of the inner hole is provided with a connecting sleeve female thread 201 that mates with the male thread 105 of the internal blowout preventer on the protruding end of the blowout preventer, and the other end is provided with a connecting sleeve right thread 202. A rotating hole 203 is also provided on the outer wall surface of the male connecting sleeve 2 on the same side as the connecting sleeve right thread 202.

[0041] See Figure 4This is a schematic diagram of the structure of a male core compression sleeve 3 in a pressure test plug for an internal anti-spray tool disclosed in an embodiment of the present invention. The male core compression sleeve 3 is axially provided with a male core compression sleeve inner hole 304; one end of the male core compression sleeve 3 is provided with a male core compression sleeve thread 301 that mates with the right thread 202 of the connecting sleeve on its outer surface, and the other end is provided with a male core compression sleeve protrusion 303; the end face of the male core compression sleeve 3 near the male core compression sleeve thread 301 is the male core compression sleeve end face 302.

[0042] See Figure 5 This is a schematic diagram of the male core 4 in a pressure test plug for an internal anti-spray tool disclosed in an embodiment of the present invention. One end face of the male core 4 is provided with a first sealing O-ring groove 404, and the other end face is provided with a second sealing O-ring groove 407. A male core water eye 406 is axially provided on the male core 4. A protrusion is provided on the outer wall of the male core 4 near the second sealing O-ring groove 407, forming a pressing end face 401 that contacts the pressing sleeve end face 302. A male core thread 403 is provided on the outer wall of the male core 4 near the first sealing O-ring groove 404 for connecting the pressure test pipeline.

[0043] See Figure 6 This is a schematic diagram of the structure of the female connector 7 in the pressure test plug of an internal blowout preventer disclosed in an embodiment of the present invention. The female connector 7 is provided with a female connector water eye 704 in the axial direction. The female connector 7 is composed of two cylindrical sections with progressively decreasing diameters. The outer wall surface of the cylindrical section with the largest diameter is provided with a female connector right thread 702 that mates with the internal concave end thread of the internal blowout preventer. The cylindrical section with the middle diameter is provided with a female connector left thread 701. The cylindrical section with the middle diameter is also connected to a female connector protrusion section 703.

[0044] See Figure 7 This is a schematic diagram of the structure of the female core 8 in the pressure test plug of an internal blowout preventer disclosed in an embodiment of the present invention. The female core 8 is provided with an axially arranged female core inner hole 803 that mates with the left thread 701 of the female connector; the outer wall surface of the female core 8 is a female core conical surface 802 that mates with the inner wall surface of the concave end of the internal blowout preventer; a female core sealing O-ring groove 801 is provided on the female core conical surface 802.

[0045] See Figure 8This is a schematic diagram of the structure of a female core pressure cap 11 in an internal anti-spray tool pressure test plug disclosed in an embodiment of the present invention. The female core pressure cap 11 is axially provided with a female core water eye 116; a second sealing O-ring groove 114 is provided on the female core pressure cap end face 114 of the female core pressure cap 11 that contacts the female core 8; a groove is axially provided on one end of the female core pressure cap 11 near the female core pressure cap end face 114, and an internal thread 112 of the female core pressure cap is provided on the inner wall of the groove that mates with the left thread 701 of the female connector; a female core protrusion section 111 is provided on the middle outer wall of the female core pressure cap 11; an external thread 115 of the female core pressure cap is provided on the outer wall of the other end of the female core pressure cap 11 away from the female core pressure cap end face 114, and a first sealing O-ring groove 117 of the female core pressure cap is provided on the other end face.

[0046] The working process of this invention is as follows:

[0047] The male connector sleeve female thread 201 is screwed clockwise onto the male thread 105 of the inner blowout preventer tool. The male core second sealing O-ring groove 407 is equipped with the male core second sealing O-ring. The male core compression sleeve inner hole 304 is fitted onto the male core outer cylinder 402. The male core compression sleeve thread 301 is screwed onto the right thread 202 of the connector sleeve. Rotating the male core compression sleeve protruding section 303 clockwise pushes the male core compression sleeve end face 302 and the male core end face 401 to press together. This further pushes the male core sealing end face 405 and the small end face 106 of the male thread of the inner blowout preventer tool to press together, thus achieving a seal between the male core sealing end face 405 and the small end face 106 of the male thread of the inner blowout preventer tool.

[0048] Rotate the protruding section 703 of the female connector body to screw the male thread 702 of the female connector body clockwise onto the female thread 102 of the internal blowout preventer; the female core seal O-ring 9 is installed in the female core seal O-ring groove 801, the inner hole 803 of the female core is fitted onto the left thread 701 of the female connector body, the second seal O-ring 10 of the female core pressure cap is in the second seal O-ring groove 114 of the female core pressure cap, and the inner thread 112 of the female core pressure cap is screwed clockwise onto the left thread 701 of the female connector body; rotate the hexagonal 111 of the female core to push the end face 113 of the female core pressure cap and the end face 804 of the female core to press together, and push the conical surface 802 of the female core to press together with the conical surface 101 of the female thread boring hole; thus achieving a seal between the female core pressure cap 11 and the female core 8, and between the female core 8 and the conical surface 101 of the female thread boring hole.

[0049] The male nozzle first sealing O-ring 5 is installed in the male nozzle first sealing O-ring groove 404 and connected to the pressure test pipeline; the female nozzle pressure cap first sealing O-ring 12 is installed in the female nozzle pressure cap first sealing O-ring groove 117 and connected to the pressure test pipeline; forming a reliable sealed integral container, which can realize the sealing pressure test of the internal blowout preventer.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressure test plug for internal blowout preventers, characterized in that, Includes a male plug unit connected to the protruding end of the internal blowout preventer and a female plug unit connected to the concave end of the internal blowout preventer; The male plug unit includes a male connecting sleeve (2), a male core pressing sleeve (3), and a male core (4) coaxially sleeved from the outside to the inside; one end of the inner hole of the male connecting sleeve (2) is threadedly connected to the protruding end of the inner blowout preventer, and the other end is threadedly connected to the male core pressing sleeve (3); the male core pressing sleeve (3) is used to press the male core (4) onto the end face of the protruding end of the inner blowout preventer to achieve a seal; the male core (4) is axially provided with a male core water eye (406) coaxial with the water eye of the inner blowout preventer, and sealing devices are provided on both end faces of the male core (4); The female plug unit includes a female connector (7) threadedly connected to the concave end of the internal blowout preventer. A female filler (8) is fitted on the female connector (7). A sealing device is provided on the wall of the female filler (8) to achieve sealing by contacting the inner wall of the concave end of the internal blowout preventer. A female filler cap (11) is also fitted on the female connector (7). Sealing devices are provided on both ends of the female filler cap (11). Both the female connector (7) and the female filler cap (11) are axially provided with water holes coaxial with the water holes of the internal blowout preventer. The empty ends of the female filler cap (11) and the male filler (4) are used to connect to the test pipeline.

2. The pressure test plug for internal blowout preventers according to claim 1, characterized in that, The unused ends of the female core cap (11) and the male core (4) are both provided with threads for connecting the test pipeline.

3. The pressure test plug for internal blowout preventers according to claim 1, characterized in that, The male connecting sleeve (2) is a cylindrical section with an inner hole in the axial direction; one end of the inner hole is provided with a connecting sleeve female thread (201) that mates with the thread on the protruding end of the blowout preventer, and the other end is provided with a connecting sleeve right thread (202); the male connecting sleeve (2) is also provided with a rotating hole (203) on the outer wall surface on the same side as the connecting sleeve right thread (202).

4. The pressure test plug for internal blowout preventers according to claim 2, characterized in that, The male core compression sleeve (3) is provided with an axial male core compression sleeve inner hole (304); one end of the male core compression sleeve (3) is provided with a male core compression sleeve thread (301) that mates with the right thread (202) of the connecting sleeve, and the other end is provided with a male core compression sleeve protrusion section (303); one end face of the male core compression sleeve (3) near the male core compression sleeve thread (301) is the male core compression sleeve end face (302).

5. The pressure test plug for internal blowout preventers according to claim 4, characterized in that, The male core (4) has a first sealing O-ring groove (404) on one end face and a second sealing O-ring groove (407) on the other end face; the male core (4) has a male core water eye (406) on its axial direction; the male core (4) has a protrusion on the outer wall of the end near the second sealing O-ring groove (407) to form a pressing end face (401) that contacts the pressing sleeve end face (302) of the male core; the male core (4) has a male core thread (403) on the outer wall of the end near the first sealing O-ring groove (404) for connecting the pressure test pipeline.

6. The pressure test plug for internal blowout preventers according to claim 5, characterized in that, The cross-sections of the male core compression sleeve protrusion (303) and the female core protrusion (111) are hexagonal.

7. The pressure test plug for internal blowout preventers according to claim 1, characterized in that, The female connector (7) is provided with a water eye (704) in the axial direction; the female connector (7) is composed of two cylindrical sections with progressively decreasing diameters; the outer wall of the cylindrical section with the largest diameter is provided with a female connector right thread (702) that mates with the concave end thread of the internal anti-spray tool, and the cylindrical section with the middle diameter is provided with a female connector left thread (701); the cylindrical section with the middle diameter is also connected to a female connector protrusion section (703).

8. The pressure test plug for internal blowout preventers according to claim 7, characterized in that, The female core (8) is provided with an axially arranged inner hole (803) that mates with the left thread (701) of the female connector; the outer wall surface of the female core (8) is a female core conical surface (802) that mates with the inner wall surface of the concave end of the inner anti-spray tool; a female core sealing O-ring groove (801) is provided on the female core conical surface (802).

9. The pressure test plug for internal blowout preventers according to claim 8, characterized in that, The female core pressure cap (11) is provided with a female core water hole (116) axially; the female core pressure cap end face (113) that contacts the female core (8) is provided with a second sealing O-ring groove (114); the female core pressure cap (11) is provided with a groove axially at one end near the female core pressure cap end face (113), and the inner wall of the groove is provided with a female core pressure cap internal thread (112) that mates with the left thread (701) of the female connector; the female core pressure cap (11) is provided with a female core protrusion section (111) in the middle of the outer wall; the female core pressure cap (11) is provided with a female core external thread (115) on the outer wall of the other end away from the female core pressure cap end face (113), and the other end face is provided with a female core pressure cap first sealing O-ring groove (117).

10. The pressure test plug for internal blowout preventers according to any one of claims 1-9, characterized in that, The sealing device is a sealing O-ring.

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