Internal blowout prevention tool pressure test plug

Abstract

The invention discloses a pressure test plug for an internal blowout prevention tool, and belongs to the technical field of petroleum drilling. Comprising a male plug unit connected to the protruding end of the inner blowout prevention tool and a female plug unit connected to the concave end of the inner blowout prevention tool. The male plug unit comprises a male connecting sleeve (2), a male bushing pressing sleeve and a male bushing which are sequentially and coaxially sleeved from outside to inside; one end of an inner hole of the male connecting sleeve is in threaded connection with the protruding end of the inner blowout prevention tool, and the other end is in threaded connection with the male bushing pressing sleeve. The female plug unit comprises a female connector in threaded connection with the inner concave end of the inner blowout prevention tool, the female connector is sleeved with a female bushing, and a sealing device is arranged on the wall face of the female bushing and used for making contact with the inner wall face of the inner concave end of the inner blowout prevention tool to achieve sealing. The male plug and the female plug respectively consist of three small parts, are light in weight and easy to assemble and disassemble, save manpower consumption, and obviously improve the pressure test efficiency of the inner blowout prevention tool compared with the existing device and method.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum drilling and relates to a pressure test plug for an internal blowout prevention tool. Background Art

[0002] The drilling tool is mainly composed of square drill rods, drill pipes, drill collars, internal blowout preventers, etc., which are connected in series through two-end threads. There is an internal through-channel in the axial direction. It is the pipe string for the drilling rig to achieve drilling depth. The internal blowout preventer is a cylindrical short section, which is connected to the drilling tool through a connecting thread. There is an internal channel in the axial direction. The channel has a one-way open and closed valve to achieve the flow of drilling fluid from the internal channel of the drilling tool from top to bottom and prevent the drilling fluid from flowing from the internal channel of the drilling tool from bottom to top. According to the requirements of GBT25429 "Specifications for Internal Blowout Preventers", the existing internal blowout preventers must undergo a sealing pressure test before leaving the factory, that is, the valve body and valve core of the internal blowout preventer must undergo a sealing pressure test before leaving the factory, and they can only be used if they pass the test. When the internal blowout preventer undergoes a sealing pressure test, the threaded parts at both ends of the internal blowout preventer need to be blocked to form a reliable sealed integral container with the ability to withstand an internal pressure of 105MPa or above.

[0003] When the internal blowout preventer tool is subjected to the sealing pressure test, the two-end threaded parts are currently blocked. The existing blocking methods are blocking with a press with a complex structure, blocking with a pressure cap, and blocking with a pressure plug. The method of blocking with a press has the disadvantage that the blocking equipment is complex and the efficiency is low; the method of blocking with a pressure cap has the disadvantage that the pressure cap is difficult to remove and the efficiency is low, and it still cannot solve the problem of fast buckle-on and off of the internal blowout preventer tool pressure test plug. The Chinese utility model patent with application number 202021007484.X, named "A Simple Internal Blowout Preventer Tool Pressure Test Short Section", only solves the problem of internal blowout preventer tool pressure test connection, and does not effectively solve the problem of how to achieve high-pressure sealing and quick buckle-on and off on site. The existing tools and methods for blocking the two-end threaded parts of the internal blowout preventer tool cannot meet the working conditions of high-pressure sealing while ensuring easy disassembly, which limits the pressure test efficiency of the internal blowout preventer tool and brings certain difficulties to production guarantee. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem that the sealing device for the pressure test of the internal blowout prevention tool in the prior art cannot meet the working conditions of high pressure sealing while ensuring easy disassembly, and to provide a pressure test plug for the internal blowout prevention tool.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

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

[0007] The male plug unit comprises a male connection sleeve, a male bushing compression sleeve and a male bushing which are coaxially sleeved from outside to inside in sequence; one end of the inner hole of the male connection sleeve is threadedly connected to the protruding end of the internal blowout prevention tool, and the other end is threadedly connected to the male bushing compression sleeve; the male bushing compression sleeve is used to press the male bushing onto the end face of the protruding end of the internal blowout prevention tool to achieve sealing; the male bushing is axially provided with a male bushing water eye coaxial with the water eye of the internal blowout prevention tool, and sealing devices are provided on both end faces of the male bushing;

[0008] The female plug unit comprises a female connector threadedly connected to the inner concave end of the internal blowout preventer tool, a female bushing is sleeved on the female connector, a sealing device is arranged on the wall surface of the female bushing for contacting with the inner wall surface of the inner concave end of the internal blowout preventer tool to achieve sealing; a female bushing pressure cap is also sleeved on the female connector, and sealing devices are arranged on both end surfaces of the female bushing pressure cap; the female connector and the female bushing pressure cap are both axially provided with water holes coaxial with the water holes of the internal blowout preventer tool; the vacant ends of the female bushing pressure cap and the male bushing are both used for connecting the pressure test pipeline.

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

[0010] The vacant ends of the female bushing cap and the male bushing are both provided with threads for connecting the pressure test pipeline.

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

[0012] The male bushing compression sleeve is axially provided with a male bushing compression sleeve inner hole; the outer surface of one end of the male bushing compression sleeve is provided with a male bushing compression sleeve thread matching with the right thread of the connecting sleeve, and the other end is provided with a male bushing compression sleeve protruding section; the end face of the male bushing compression sleeve close to the male bushing compression sleeve thread is the end face of the male bushing compression sleeve.

[0013] A first male bushing sealing O-ring groove is arranged on one end surface of the male bushing, and a second male bushing sealing O-ring groove is arranged on the other end surface; a male bushing water eye is arranged axially of the male bushing; a protrusion is arranged on the outer wall surface of one end of the male bushing close to the second male bushing sealing O-ring groove to form a clamping end surface in contact with the end surface of the male bushing clamping sleeve; a male bushing thread is arranged on the outer wall surface of one end of the male bushing close to the first male bushing sealing O-ring groove for connecting a pressure test pipeline.

[0014] The female connector is axially provided with a female connector water hole; the female connector is composed of two cylindrical sections with decreasing diameters in steps; the outer wall surface of the cylindrical section with the largest diameter is provided with a right thread of the female connector that matches the inner concave end thread of the internal blowout preventer 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 the protruding section of the female connector.

[0015] The female bushing is axially provided with a female bushing inner hole matched with the left-hand thread of the female connector; the outer wall surface of the female bushing is a female bushing conical surface matched with the inner wall surface of the inner concave end of the internal blowout prevention tool; and a female bushing sealing O-ring groove is provided on the female bushing conical surface.

[0016] The female bushing pressure cap is axially provided with a female bushing water hole; the female bushing pressure cap end face that contacts the female bushing is provided with a female bushing pressure cap second sealing O-ring groove; the female bushing pressure cap is axially provided with a groove at one end close to the female bushing pressure cap end face, and the inner wall surface of the groove is provided with a female bushing pressure cap internal thread that cooperates with the left thread of the female connector; the female bushing protruding section is provided on the middle outer wall surface of the female bushing pressure cap; the female bushing pressure cap external thread is provided on the outer wall surface of the other end of the female bushing pressure cap away from the female bushing pressure cap end face, and the female bushing pressure cap first sealing O-ring groove is provided on the other end face.

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

[0018] The cross sections of the male bushing compression sleeve protruding section and the female bushing protruding section are hexagonal.

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

[0020] The invention discloses a pressure test plug for an internal blowout prevention tool, which is composed of a male connecting sleeve, a male bushing compression sleeve, a male bushing, a female connecting body, a female bushing, a female bushing pressure cap, a sealing O-ring, etc. The male bushing compression sleeve is mounted on the male bushing, the thread of the male bushing compression sleeve is screwed on the male connecting sleeve, the thread of the male connecting sleeve is screwed on the male thread of the internal blowout prevention tool, a sealing O-ring is arranged between the male bushing and the internal blowout prevention tool, and a male plug is formed; the male thread of the female connecting body is screwed on the female thread of the internal blowout prevention tool, the female bushing is mounted on the female connecting body, the thread of the female bushing pressure cap is connected to the left thread of the female connecting body, a sealing O-ring is arranged between the female bushing and the internal blowout prevention tool, and a sealing O-ring is arranged between the female bushing and the female bushing pressure cap, and a female plug is formed. The external thread of the male bushing and the external thread of the female bushing pressure cap are connected to the pressure test pipeline, so that the sealing pressure test of the internal blowout prevention tool can be realized. The O-type seal does not rotate, is not easily damaged, and has a long service life; the male plug and the female plug are respectively composed of three small parts, which are light in weight, easy to assemble and disassemble, and save manpower consumption. Compared with existing devices and methods, the pressure test efficiency of the internal blowout preventer tool is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the assembly structure of the pressure test plug of the internal blowout prevention tool in the present invention;

[0023] Figure 2 It is a structural schematic diagram of the internal blowout prevention tool in the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the male connection sleeve of the pressure test plug of the internal blowout prevention tool in the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the male bushing compression sleeve of the internal blowout prevention tool pressure test plug in the present invention;

[0026] Figure 5 It is a schematic diagram of the male bushing structure of the pressure test plug of the internal blowout prevention tool in the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the female connector of the internal blowout prevention tool pressure test plug in the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the female bushing of the pressure test plug of the internal blowout prevention tool in the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the female bushing pressure cap of the internal blowout prevention tool pressure test plug in the present invention.

[0030] Among them: 1-internal blowout prevention tool; 2-male connecting sleeve; 3-male bushing compression sleeve; 4-male bushing; 5-male bushing first sealing O-ring; 6-male bushing second sealing O-ring; 7-female connector; 8-female bushing; 9-female bushing sealing O-ring; 10-female bushing pressure cap second sealing O-ring; 11-female bushing pressure cap; 12-female bushing pressure cap first sealing O-ring; 101-female thread boring cone; 102-internal blowout prevention tool female thread; 103-water eye; 104-valve; 105-internal blowout prevention tool male thread; 106-internal blowout prevention tool male thread small end face; 201-connection sleeve female thread; 202-connection sleeve right thread; 203-rotation hole; 301-male bushing compression sleeve thread; 302-male bushing compression sleeve end face; 303-male bushing compression sleeve protruding section; 304-male bushing Inner hole of compression sleeve; 401-compression end face; 402-external cylinder; 403-male bushing thread; 404-male bushing first sealing O-ring groove; 405-male bushing end face; 406-male bushing water hole; 407-male bushing second sealing O-ring groove; 701-female connector left thread; 702-female connector right thread; 703-female connector female bushing; 704-female connector water hole; 801 - female bushing sealing O-ring groove; 802 - female bushing cone surface; 803 - female bushing inner hole; 804 - female bushing end face; 111 - female bushing protruding section; 112 - female bushing pressure cap inner thread; 113 - female bushing pressure cap end face; 114 - female bushing pressure cap second sealing O-ring groove; 115 - female bushing pressure cap outer thread; 116 - female bushing water eye; 117 - female bushing pressure cap first sealing O-ring groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

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

[0035] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which 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 is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0038] See also Figure 1The embodiment of the present invention discloses a pressure test plug for an internal blowout prevention tool, comprising a male plug unit connected to the protruding end of the internal blowout prevention tool and a female plug unit connected to the inner concave end of the internal blowout prevention tool; the male plug unit comprises a male connecting sleeve 2, a male bushing compression sleeve 3 and a male bushing 4 which are coaxially sleeved in sequence from outside to inside; one end of the inner hole of the male connecting sleeve 2 is threadedly connected to the internal blowout prevention tool male thread 105 at the protruding end of the internal blowout prevention tool, and the other end is threadedly connected to the male bushing compression sleeve 3; the male bushing compression sleeve 3 is used to press the male bushing 4 onto the end face of the protruding end of the internal blowout prevention tool to achieve sealing; the male bushing 4 is axially provided with a male bushing water eye 4 coaxial with the water eye of the internal blowout prevention tool 06. Sealing devices are provided on both end faces of the male bushing 4; the female plug unit comprises a female connector 7 which is threadedly connected to the inner concave end of the internal blowout prevention tool, a female bushing 8 is sleeved on the female connector 7, a sealing O-ring groove is provided on the wall surface of the female bushing 8, which is used to contact with the inner wall surface of the inner concave end of the internal blowout prevention tool to achieve sealing; a female bushing pressure cap 11 is also sleeved on the female connector 7, and sealing devices are provided on both end faces of the female bushing pressure cap 11; the female connector 7 and the female bushing pressure cap 11 are both axially provided with water holes coaxial with the water holes 103 of the internal blowout prevention tool; the vacant ends of the female bushing pressure cap 11 and the male bushing 4 are both threadedly connected to the pressure test pipeline.

[0039] See also Figure 2 , is an internal blowout preventer tool using the pressure test plug of the present invention, which is a cylindrical short section connected to the drill tool through a connecting thread, and an internal blowout preventer tool water hole 103 is arranged in the axial direction, and a one-way opening and closing valve 104 is arranged in the water hole 103 to realize the drilling fluid flowing from the internal channel of the drill tool from top to bottom and prevent the drilling fluid from flowing from the internal channel of the drill tool from bottom to top; one end of the internal blowout preventer tool is a protruding end, and an internal blowout preventer tool male thread 105 is arranged on the protruding end, and the end face of the protruding end is the internal blowout preventer tool male thread small end face 106; the other end of the internal blowout preventer tool is a concave end, and the inner wall surface of the concave end is a female thread boring cone surface 101, and the female thread boring cone surface 101 is provided with an internal blowout preventer tool female thread 102.

[0040] See also Figure 3 , is a schematic structural diagram of a male connecting sleeve 2 in a pressure test plug for an internal blowout prevention tool disclosed in an embodiment of the present invention. The male connecting sleeve 2 is a cylindrical section with an inner hole axially arranged; one end of the inner hole is provided with a connecting sleeve female thread 201 that matches the internal blowout prevention tool male thread 105 on the protruding end of the blowout prevention tool, and the other end is provided with a connecting sleeve right thread 202; the outer wall surface of the male connecting sleeve 2 located on the same side of the connecting sleeve right thread 202 is also provided with a rotation hole 203.

[0041] See also Figure 4, is a schematic structural diagram of a male bushing compression sleeve 3 in a pressure test plug for an internal blowout prevention tool disclosed in an embodiment of the present invention, wherein the male bushing compression sleeve 3 is axially provided with a male bushing compression sleeve inner hole 304; a male bushing compression sleeve thread 301 matching with the right thread 202 of the connecting sleeve is provided on the outer surface of one end of the male bushing compression sleeve 3, and a male bushing compression sleeve protruding section 303 is provided on the other end; an end face of the male bushing compression sleeve 3 close to the male bushing compression sleeve thread 301 is a male bushing compression sleeve end face 302.

[0042] See also Figure 5 , is a schematic structural diagram of a male bushing 4 in a pressure test plug for an internal blowout prevention tool disclosed in an embodiment of the present invention, wherein a male bushing first sealing O-ring groove 404 is provided on one end surface of the male bushing 4, and a male bushing second sealing O-ring groove 407 is provided on the other end surface; a male bushing water eye 406 is provided axially of the male bushing 4; a protrusion is provided on the outer wall surface of one end of the male bushing 4 close to the male bushing second sealing O-ring groove 407, forming a compression end surface 401 in contact with the male bushing compression sleeve end surface 302; a male bushing thread 403 is provided on the outer wall surface of one end of the male bushing 4 close to the male bushing first sealing O-ring groove 404, for connecting a pressure test pipeline.

[0043] See also Figure 6 , is a structural schematic diagram of a female connector 7 in a pressure test plug for an internal blowout prevention tool disclosed in an embodiment of the present invention, wherein a female connector water hole 704 is axially arranged on the female connector 7; the female connector 7 is composed of two cylindrical sections with stepped decreasing diameters; the outer wall surface of the cylindrical section with the largest diameter is provided with a female connector right thread 702 that cooperates with the inner concave end thread of the internal blowout prevention 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 protruding section 703.

[0044] See also Figure 7 , is a schematic structural diagram of a female bushing 8 in a pressure test plug for an internal blowout prevention tool disclosed in an embodiment of the present invention, wherein the female bushing 8 is axially provided with a female bushing inner hole 803 that cooperates with a left-hand thread 701 of a female connector; the outer wall surface of the female bushing 8 is a female bushing conical surface 802 that cooperates with the inner wall surface of the inner concave end of the internal blowout prevention tool; and a female bushing sealing O-ring groove 801 is provided on the female bushing conical surface 802.

[0045] See also Figure 8, is a schematic structural diagram of a female bushing cap 11 in a pressure test plug for an internal blowout prevention tool disclosed in an embodiment of the present invention, wherein the female bushing cap 11 is axially provided with a female bushing water hole 116; a female bushing cap second sealing O-ring groove 114 is provided on a female bushing cap end face 114 of the female bushing cap 11 that contacts the female bushing 8; a groove is axially provided at one end of the female bushing cap 11 close to the female bushing cap end face 114, and a female bushing cap internal thread 112 that cooperates with the left thread 701 of the female connector is provided on the inner wall surface of the groove; a female bushing protruding section 111 is provided on the middle outer wall surface of the female bushing cap 11; a female bushing cap external thread 115 is provided on the outer wall surface of the other end of the female bushing cap 11 away from the female bushing cap end face 114, and a female bushing cap first sealing O-ring groove 117 is provided on the other end surface.

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

[0047] The female thread 201 of the male connecting sleeve is screwed onto the male thread 105 of the internal blowout prevention tool in a clockwise manner, the second sealing O-ring groove 407 of the male bushing is provided with the second sealing O-ring of the male bushing, the inner hole 304 of the male bushing compression sleeve is sleeved onto the male bushing outer cylinder 402, and the male bushing compression sleeve thread 301 is screwed onto the right thread 202 of the connecting sleeve; the protruding section 303 of the male bushing compression sleeve is rotated clockwise to push the end face 302 of the male bushing compression sleeve to be pressed against the end face 401 of the male bushing, and further push the sealing end face 405 of the male bushing to be pressed against the small end face 106 of the male thread of the internal blowout prevention tool, so as to achieve sealing between the sealing end face 405 of the male bushing and the small end face 106 of the male thread of the internal blowout prevention tool.

[0048] Rotate the protruding section 703 of the female connector, and screw the male thread 702 of the female connector clockwise onto the female thread 102 of the internal blowout prevention tool; the female bushing sealing O-ring 9 is installed in the female bushing sealing O-ring groove 801, the female bushing inner hole 803 is sleeved on the left thread 701 of the female connector, the female bushing pressure cap second sealing O-ring 10 is in the female bushing pressure cap second sealing O-ring groove 114, and the female bushing pressure cap inner thread 112 is screwed clockwise onto the left thread 701 of the female connector; rotate the female bushing hexagon 111, push the female bushing pressure cap end face 113 and the female bushing end face 804 to be pressed tightly, and push the female bushing conical surface 802 and the female thread boring hole conical surface 101 to be pressed tightly; realize the sealing between the female bushing pressure cap 11 and the female bushing 8, and between the female bushing 8 and the female thread boring hole conical surface 101.

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

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure test plug for an internal blowout prevention tool, characterized in that: It includes a male plug unit connected to the protruding end of the internal blowout prevention tool and a female plug unit connected to the concave end of the internal blowout prevention tool; The male plug unit comprises a male connection sleeve (2), a male bushing compression sleeve (3) and a male bushing (4) which are coaxially sleeved in sequence from outside to inside; one end of the inner hole of the male connection sleeve (2) is threadedly connected to the protruding end of the internal blowout prevention tool, and the other end is threadedly connected to the male bushing compression sleeve (3); the male bushing compression sleeve (3) is used to press the male bushing (4) onto the end face of the protruding end of the internal blowout prevention tool to achieve sealing; the male bushing (4) is axially provided with a male bushing water eye (406) coaxial with the water eye of the internal blowout prevention tool, and sealing devices are provided on both end faces of the male bushing (4); The female plug unit comprises a female connector (7) threadedly connected to the inner concave end of the internal blowout prevention tool, a female bushing (8) is sleeved on the female connector (7), a sealing device is arranged on the wall surface of the female bushing (8) for contacting with the inner wall surface of the inner concave end of the internal blowout prevention tool to achieve sealing; a female bushing pressure cap (11) is also sleeved on the female connector (7), and sealing devices are arranged on both end surfaces of the female bushing pressure cap (11); the female connector (7) and the female bushing pressure cap (11) are both axially provided with water holes coaxial with the water holes of the internal blowout prevention tool; the vacant ends of the female bushing pressure cap (11) and the male bushing (4) are both used for connecting a pressure test pipeline.

2. The internal blowout prevention tool pressure test plug according to claim 1, characterized in that: The vacant ends of the female bushing cap (11) and the male bushing (4) are both provided with threads for connecting to a pressure test pipeline.

3. The internal blowout prevention tool pressure test plug according to claim 1, characterized in that: The male connecting sleeve (2) is a cylindrical section with an inner hole axially arranged therein; one end of the inner hole is provided with a connecting sleeve female thread (201) matched with the thread on the protruding end of the blowout prevention tool, and the other end is provided with a connecting sleeve right thread (202); the outer wall surface of the male connecting sleeve (2) located on the same side as the connecting sleeve right thread (202) is also provided with a rotation hole (203).

4. The internal blowout prevention tool pressure test plug according to claim 2, characterized in that: The male bushing compression sleeve (3) is axially provided with a male bushing compression sleeve inner hole (304); a male bushing compression sleeve thread (301) matching with the right thread (202) of the connecting sleeve is provided on the outer surface of one end of the male bushing compression sleeve (3), and a male bushing compression sleeve protruding section (303) is provided on the other end; an end face of the male bushing compression sleeve (3) close to the male bushing compression sleeve thread (301) is the male bushing compression sleeve end face (302).

5. The internal blowout prevention tool pressure test plug according to claim 4, characterized in that: A first male bushing sealing O-ring groove (404) is arranged on one end surface of the male bushing (4), and a second male bushing sealing O-ring groove (407) is arranged on the other end surface; a male bushing water hole (406) is arranged axially on the male bushing (4); a protrusion is arranged on the outer wall surface of one end of the male bushing (4) close to the second male bushing sealing O-ring groove (407) to form a compression end surface (401) in contact with the end surface (302) of the male bushing compression sleeve; and a male bushing thread (403) is arranged on the outer wall surface of one end of the male bushing (4) close to the first male bushing sealing O-ring groove (404) for connecting a pressure test pipeline.

6. The internal blowout prevention tool pressure test plug according to claim 1, characterized in that: The female connector (7) is axially provided with a female connector water hole (704); the female connector (7) is composed of two cylindrical sections with stepped diameters; the outer wall surface of the cylindrical section with the largest diameter is provided with a female connector right thread (702) that matches with the inner concave end thread of the internal blowout prevention 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 the female connector protruding section (703).

7. The internal blowout prevention tool pressure test plug according to claim 6, characterized in that: The female bushing (8) is axially provided with a female bushing inner hole (803) that matches with the left-hand thread (701) of the female connector; the outer wall surface of the female bushing (8) is a female bushing conical surface (802) that matches with the inner wall surface of the inner concave end of the internal blowout prevention tool; and a female bushing sealing O-ring groove (801) is provided on the female bushing conical surface (802).

8. The internal blowout prevention tool pressure test plug according to claim 7, characterized in that: The female bushing cap (11) is axially provided with a female bushing water hole (116); a female bushing cap second sealing O-ring groove (114) is provided on the female bushing cap end face (114) of the female bushing cap (11) that contacts the female bushing (8); a groove is axially provided on one end of the female bushing cap (11) close to the female bushing cap end face (114), and a female bushing cap internal thread (112) that cooperates with the left thread (701) of the female connector is provided on the inner wall surface of the groove; a female bushing protruding section (111) is provided on the middle outer wall surface of the female bushing cap (11); a female bushing cap external thread (115) is provided on the outer wall surface of the other end of the female bushing cap (11) away from the female bushing cap end face (114), and a female bushing cap first sealing O-ring groove (117) is provided on the other end surface.

9. The internal blowout prevention tool pressure test plug according to any one of claims 1 to 8, characterized in that: The sealing device is a sealing O-ring.

10. The internal blowout prevention tool pressure test plug according to claim 5 or 8, characterized in that: The cross sections of the male bushing compression sleeve protruding section (303) and the female bushing protruding section (111) are hexagonal.

Images