Multifunctional oil pipe blocking valve

Abstract

The utility model belongs to the field of blocking devices, and particularly discloses a multifunctional oil pipe blocking valve with a pressure testing function. The multifunctional oil pipe plugging valve comprises a valve body, a lower connector, a central channel, a plugging piece and a pressure testing plug, wherein the valve body and the lower connector are connected, the central channel penetrates through the valve body and the lower connector, the plugging piece is detachably arranged in the central channel and seals the central channel, the pressure testing plug is detachably arranged in the central channel and seals the central channel, and the pressure testing plug is located on the upper side of the plugging piece. The pressure testing plug is arranged, so that the multifunctional oil pipe blocking valve can be used for sealing and isolating pressure on a well and has a pressure testing function; when the pressure testing plug is used for isolating an oil pipe channel, after an oil (gas) extraction tree and / or a blowout preventer are / is replaced, wellhead sealing pressure testing can be carried out, and after pressure testing is completed, the pressure testing plug is taken out to carry out follow-up operation. On the premise of meeting operation requirements, operation procedures are reduced, operation efficiency is improved, the number of times of tripping tools is reduced, and the risk that blowout is out of control can be effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of blocking devices, specifically relating to a multifunctional oil pipe blocking valve. Background Technology

[0002] Newly drilled oil and gas wells require frequent replacement of the wellhead (or production tree) and blowout preventer (BOP) after drilling. During replacement, the wellhead is open, and the pressure at both ends of the wellhead is balanced primarily by injecting drilling mud into the well. Then, a tubing plug valve is installed in the tubing to seal the downhole tubing passage. The main function of this tubing plug valve is to prevent excessive downhole pressure from disrupting the pressure balance at the wellhead. When the downhole pressure exceeds the surface pressure, it can isolate the tubing passage and prevent a blowout. Additionally, when necessary, pressure is applied from the wellhead to the top of the tubing plug valve to dislodge the plug, opening the central channel and connecting the surface and downhole systems.

[0003] For example, Chinese utility model patent CN208966263U discloses a novel oil pipe blocking valve, including an integral valve body and a lower connector. The valve body is provided with a connection structure corresponding to an oil pipe hanger. The valve body is also provided with a central channel for fluid passage. A blockage for blocking fluid passage is provided in the central channel. The inner wall of the central channel is also connected with an unblocking component to restrict the downward movement of the blockage. The lower connector is provided with a lower channel communicating with the central channel.

[0004] Although existing tubing plugging valves can isolate downhole pressure and connect the uphole and downhole, they lack pressure testing capabilities. As a result, after replacing the production (gas) tree and / or blowout preventer, it is necessary to first install a pressure testing plug to isolate the wellhead for a wellhead sealing pressure test. After the pressure test is completed, the pressure testing plug is removed, and then the tubing plugging valve is installed for subsequent operations. The whole process involves many steps, takes a long time, and increases well control risks. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a multi-functional oil pipe blocking valve with pressure testing function.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a multi-functional oil pipe blocking valve, including a valve body, a lower connector, a central channel and a plugging component;

[0007] The lower connector is connected to the valve body;

[0008] The central channel runs through the valve body and the lower connector, forming a first port at the upper end of the valve body and a second port at the lower end of the lower connector.

[0009] The plug is detachably installed in the central channel and seals it off;

[0010] It also includes a test plug;

[0011] The test plug is detachably disposed in the central channel and seals it off, with the test plug located on the upper side of the plug.

[0012] Furthermore, the outer wall of the valve body is provided with a body sealing ring and a hanger connection structure.

[0013] Furthermore, the channel section of the central channel within the valve body is the central hole of the body, and a pressure testing fit structure is provided in the central hole of the body. The pressure testing fit structure includes a connecting plug section and a sealing hole section located on the upper side of the connecting plug section.

[0014] The test plug includes a test plug head that is detachably connected to the connecting plug orifice section, and a test plug body that is sealed to the sealing orifice section.

[0015] Furthermore, the test pressure plug is threadedly connected to the connecting plug hole section;

[0016] And / or, the outer wall of the test plug body is provided with an annular groove, and a test plug sealing ring is provided in the annular groove, the test plug sealing ring abutting against the groove wall of the annular groove and the hole wall of the sealing hole section respectively.

[0017] Furthermore, the pressure testing fit structure also includes a gap hole section located on the upper side of the sealing hole section;

[0018] The test plug also includes a plug-taking part connected to the upper side of the test plug body, the plug-taking part being located in the gap hole section and forming an annular gap with the hole wall of the gap hole section;

[0019] The plug-retrieving part is provided with a plug-retrieving hole, which has an opening at the upper end of the plug-retrieving part, and the wall of the plug-retrieving hole is provided with a plug-retrieving structure for connecting with a pick-and-place tool.

[0020] Furthermore, the side wall of the plug-removing part is provided with a drain hole that connects the annular gap and the plug-removing hole, and the drain hole is located on the lower side of the plug-removing structure.

[0021] Furthermore, a chamfered structure is provided at the upper edge of the plug-taking part;

[0022] And / or, the opening of the plug-taking hole is an inverted conical opening;

[0023] And / or, the plug-taking structure is internally threaded.

[0024] Furthermore, the channel section of the central channel within the lower connector is the central hole of the lower connector;

[0025] The plugging component is detachably installed in the center hole of the lower connector via a plugging component.

[0026] Furthermore, a nail groove is formed on the outer wall of the plug;

[0027] The unblocking component is a shear pin, which includes a shear pin body installed in the side wall of the lower connector, and a shear pin head connected to the inner end of the shear pin body and inserted into the pin groove.

[0028] Along the axial direction of the plug, the size of the nail groove is larger than the size of the nail head to form an adjustable limiting structure with axial movement clearance, which allows the plug to be axially positioned under the constraint of the adjustable limiting structure.

[0029] Furthermore, the multi-functional oil pipe plugging valve also includes a pressure cap;

[0030] The lower connector has a flow hole on its side wall, which is connected to the center hole of the lower connector and located on the lower side of the plug.

[0031] The pressure cap is detachably mounted at the lower end of the lower connector and covers the second end to catch any falling plug.

[0032] The beneficial effects of this utility model are as follows: This multi-functional tubing plugging valve, by setting a test plug in the central channel on the upper side of the plugging component, enables it to isolate the wellhead pressure and thus possesses a pressure testing function. Using this multi-functional tubing plugging valve to isolate the tubing channel, after replacing the production (gas) tree and / or blowout preventer, there is no need for additional test plug installation. Water can be injected from the top of the production (gas) tree or blowout preventer, and wellhead sealing pressure can be directly pumped for testing. After the pressure test is completed, the test plug in the central channel can be removed for subsequent operations. Compared with existing tubing plugging valves, using this multi-functional tubing plugging valve to isolate the tubing channel can reduce operational procedures, improve operational efficiency, and reduce the number of tool tripping operations while meeting operational needs, effectively reducing the risk of blowout.

[0033] The technical effects brought about or directly generated by other technical features of this utility model will be described in detail in the following detailed embodiments section. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0035] The markings in the diagram are as follows: 1-body sealing ring, 2-valve body, 21-body center hole, 211-connecting plug section, 212-sealing hole section, 213-gap hole section, 22-suspension connection structure, 3-test pressure plug, 31-test pressure plug head, 32-test pressure plug body, 33-plug removal part, 331-plug removal hole, 332-drain hole, 333-inverted conical opening, 4-test pressure plug sealing ring, 5-lower connector, 51-lower connector center hole, 52-flow hole, 6-plug, 61-pin groove, 7-shear pin, 8-pressure cap. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. The same reference numerals in the drawings indicate components with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position and dimensional relationship, are based on the orientation or position relationship shown in the drawings and are only for the convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] When the term "many" indicates quantity, it usually refers to three or more. For example, "multiple" typically means three or more. The terms "detachable connection" or "detachably set up" refer to a connection between two or more components that can be repeatedly disassembled and reassembled. This means that disassembly does not affect the original function of the connection structure and the components can be reconnected through the connection structure, which can include various types such as threaded connections, screw connections, bolt connections, snap-fit ​​connections, plug-in connections, and magnetic connections. The expression "mainly composed of or constitutes" can also include structural components not mentioned in the sentence. The term "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0039] like Figure 1 As shown, the multi-functional oil pipe blocking valve includes a valve body 2, a lower connector 5, a central channel, a plug 6, and a test plug 3;

[0040] The valve body 2 is the main structural part of this multi-functional tubing plugging valve. It usually has a valve delivery structure for connecting with the delivery tool. The valve delivery structure can be a snap, groove, internal thread, etc. The outer wall of the valve body 2 usually has a hanger connection structure 22 for connecting with the wellhead hanger and a body sealing ring 1 for sealing with the wellhead hanger. The hanger connection structure 22 is generally externally threaded, and the body sealing ring 1 is generally set in an annular groove opened on the outer wall of the valve body 2.

[0041] The lower connector 5 is connected to the valve body 2; for ease of use and maintenance, the two are usually kept coaxial; the lower connector 5 and the valve body 2 can be an integral structure, or fixedly connected, or detachably connected together; preferably, the lower connector 5 is threadedly connected to the valve body 2 to facilitate the maintenance and reuse of the valve body 2; the connection between the lower connector 5 and the valve body 2 is generally provided with a sealing ring to ensure airtightness.

[0042] The central channel is set through the valve body 2 and the lower connector 5, and a first port is formed at the upper end of the valve body 2 and a second port is formed at the lower end of the lower connector 5; the central channel can be used to collect downhole pressure data and serve as a flow channel for the kill fluid when it is necessary to inject kill fluid; the central channel is usually coaxial with the valve body 2 and the lower connector 5.

[0043] The plug 6 is detachably installed in the central channel and seals it; the plug 6 mainly functions to seal the downhole pressure and block the central channel;

[0044] The pressure test plug 3 is detachably installed in the central channel and seals it off. The pressure test plug 3 is located on the upper side of the plug 6. The pressure test plug 3 can block the central channel and seal the wellhead pressure so as to conduct a wellhead sealing pressure test. The pressure test plug 3 is located on the upper side of the plug 6 so that it can be removed after the pressure test is completed.

[0045] This multi-functional tubing plugging valve integrates functions such as sealing downhole pressure, connecting uphole and downhole, and sealing uphole pressure. In use, first assemble the multi-functional tubing plugging valve, then connect it to the valve body 2 using a delivery tool. Lower the valve to the predetermined position using the delivery tool, then seal the valve body 2 to the wellhead hanger. At this point, the test plug 3 and plug 6 seal the central channel. After replacing the production (gas) tree and / or blowout preventer, inject water from the top of the production (gas) tree or blowout preventer and pump pressure directly. Once the pressure reaches the test pressure value and stabilizes, observe the pressure using an external pressure gauge. If the pressure drop does not exceed the limit during the specified holding period, the test is considered successful. After the test, remove the test plug 3 from the central channel using a delivery tool lowered from the wellhead for subsequent operations. Using this multi-functional tubing plugging valve to seal the downhole tubing passage can eliminate the need for additional pressure testing plug operations. While meeting operational requirements, it reduces operational steps, improves operational efficiency, and reduces the number of tool trips, thus effectively reducing the risk of blowout.

[0046] For example Figure 1 As shown, in some embodiments, the lower end of the valve body 2 is nested with the upper end of the lower connector 2.

[0047] To prevent the multi-functional tubing blockage valve from getting stuck in the wellhead channel during the insertion and extraction process, and to facilitate smooth connection between the extraction and extraction tools and the multi-functional tubing blockage valve, in some embodiments, it is preferable to use rounded or conical corner structures for the transition of the outer contour of the valve body 2 and the lower connector 5.

[0048] For example Figure 1 As shown, in some embodiments, the channel section of the central passage within the valve body 2 is a central hole 21. A pressure testing fit structure is provided within the central hole 21, including a connecting plug section 211 and a sealing hole section 212 located above the connecting plug section 211. The pressure testing plug 3 includes a pressure testing plug head 31 detachably connected to the connecting plug section 211 and a pressure testing plug body 32 that is sealed to the sealing hole section 212. The diameter of the pressure testing plug head 31 is generally smaller than the diameter of the pressure testing plug body 32 to ensure a good sealing effect.

[0049] For example Figure 1 As shown, in order to facilitate the assembly and disassembly of the test plug 3, the test plug head 31 is threadedly connected to the connecting plug hole section 211 based on the above embodiment.

[0050] For example Figure 1 As shown, in order to improve the sealing performance, based on the above embodiment, an annular groove is opened on the outer wall of the test plug body 32, and a test plug sealing ring 4 is set in the annular groove, and the test plug sealing ring 4 abuts against the groove wall of the annular groove and the hole wall of the sealing hole section 212 respectively.

[0051] For example Figure 1 As shown, in order to facilitate the handling of the test plug 3, in some embodiments, the test fitting structure further includes a gap section 213 located on the upper side of the sealing hole section 212; the test plug 3 also includes a plug-taking part 33 connected to the upper side of the test plug body 32, the plug-taking part 33 is located in the gap section 213 and forms an annular gap with the hole wall of the gap section 213; the plug-taking part 33 is provided with a plug-taking hole 331, the plug-taking hole 331 has an opening at the upper end of the plug-taking part 33, and the hole wall of the plug-taking hole 331 is provided with a plug-taking structure for connecting with the handling tool; the plug-taking structure can be of various types, such as: buckle, groove, internal thread, etc.

[0052] For example Figure 1 As shown, to prevent the injected liquid from remaining in the plug-removing hole 331 during the pressure test, which would make it difficult to lower the delivery tool, a drain hole 332 is provided on the side wall of the plug-removing part 33, connecting the annular gap and the plug-removing hole 331. The drain hole 332 is located on the lower side of the plug-removing structure. Two or more drain holes 332 can be provided as needed, and they are evenly distributed around the circumference of the plug-removing part 33.

[0053] For example Figure 1As shown, based on the above embodiment, a chamfered structure is provided at the upper edge of the plug-taking part 33 to prevent the test plug 3 from getting stuck in the central channel during insertion and removal. The chamfered structure can be of various types, but a conical chamfered structure is preferred.

[0054] For example Figure 1 As shown, based on the above embodiment, the opening of the plug-removing hole 331 is set as an inverted conical opening 333 so that the delivery tool can smoothly enter and align the plug-removing hole 331.

[0055] For example Figure 1 As shown, in some embodiments, the channel section of the central channel within the lower connector 5 is the lower connector central hole 51; the plug 6 is detachably disposed in the lower connector central hole 51 by means of a release device. The release device is used to limit the plug 6 and can release the fixation of the plug 6 when needed, and can be a telescopic latch, a set screw, a shear pin 7, or other types.

[0056] For example Figure 1 As shown, in some embodiments, a nail groove 61 is formed on the outer wall of the plug 6; the unplugging component is a shear nail 7, which includes a shear nail body installed in the side wall of the lower connector 5, and a shear nail head connected to the inner end of the shear nail body and inserted into the nail groove 61; along the axial direction of the plug 6, the size of the nail groove 61 is larger than the size of the shear nail head, so as to form an adjustable limiting structure with an axial movement clearance, which is used to allow the plug 6 to be axially positioned under the constraint of the adjustable limiting structure. When the force on the shear nail 7 exceeds the limit, its shear nail head will be cut off, and the axial position of the plug 6 will no longer be restricted. The adjustable limiting structure facilitates the upward movement of the plug 6 to a certain position when the test pressure plug 3 is removed, preventing the formation of a negative pressure space in the channel section of the central channel between the test pressure plug 3 and the plug 6.

[0057] For example Figure 1 As shown, in some embodiments, the multi-functional tubing plugging valve further includes a pressure cap 8; a flow passage hole 52 is provided on the side wall of the lower connector 5, the flow passage hole 52 communicates with the central hole 51 of the lower connector and is located below the plug 6; the pressure cap 8 is detachably disposed at the lower end of the lower connector 5 and covers the second end cap to catch the falling plug 6 and prevent the plug 6 from falling into the well. The flow passage hole 52 is used for fluid flow in the central channel, and two or more can be opened as needed and evenly distributed around the circumference of the lower connector 5.

[0058] This document presents a description of various embodiments of the present invention for illustrative purposes only and is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein has been chosen to best explain the principles, practical applications, or technological advancements of the embodiments, or to enable others skilled in the art to understand the embodiments disclosed herein, compared to technologies found in the market.

[0059] It should be understood that, for clarity, certain features of the present invention described in the context of a single embodiment may also be provided in combination in a single embodiment. Conversely, for brevity, various features of the present invention described in the context of a single embodiment may also be provided individually or in any suitable sub-combination, or, where appropriate, in any other described embodiment of the present invention. Unless the embodiment does not function without those features, certain features described in the context of various embodiments are not considered essential features of those embodiments.

[0060] All publications, patents, and patent applications mentioned herein are incorporated herein by reference in their entirety, as if each individual publication, patent, or patent application were specifically and individually indicated as incorporated herein by reference. Furthermore, any citation or identification of references herein should not be construed as an admission that such references are prior art to this invention. With regard to the use of section headings, section headings should not be construed as necessary limitations.

Claims

1. A multifunctional tubing plug valve, comprising a valve body (2), a lower joint (5), a central passage and a plug member (6); the lower joint (5) is connected with the valve body (2); the central passage is arranged through the valve body (2) and the lower joint (5), and forms a first port at the upper end of the valve body (2) and a second port at the lower end of the lower joint (5); the plug member (6) is detachably arranged in the central passage and seals the same; characterized in that further comprising a pressure testing plug (3); the pressure testing plug (3) is detachably arranged in the central passage and seals the same, and the pressure testing plug (3) is located at the upper side of the plug member (6).

2. The multi-functional tubing plug valve of claim 1, wherein: A body sealing ring (1) and a hanger connecting structure (22) are arranged on the outer wall of the valve body (2).

3. The multi-functional tubing plug valve of claim 1, wherein: The passage section of the central passage in the valve body (2) is a body central hole (21), and a pressure testing matching structure is arranged in the body central hole (21), the pressure testing matching structure comprises a plug connecting hole section (211) and a sealing hole section (212) located at the upper side of the plug connecting hole section (211); the pressure testing plug (3) comprises a pressure testing plug head (31) detachably connected with the plug connecting hole section (211), and a pressure testing plug body (32) sealingly matched with the sealing hole section (212).

4. The multi-functional tubing plug valve of claim 3, wherein: the pressure testing plug head (31) is threadedly connected with the plug connecting hole section (211); and / or, an annular groove is arranged on the outer wall of the pressure testing plug body (32), a pressure testing plug sealing ring (4) is arranged in the annular groove, and the pressure testing plug sealing ring (4) abuts against the groove wall of the annular groove and the hole wall of the sealing hole section (212) respectively.

5. The multi-functional tubing plug valve of claim 3, wherein: the pressure testing matching structure further comprises a gap hole section (213) located at the upper side of the sealing hole section (212); the pressure testing plug (3) further comprises a plug taking part (33) connected at the upper side of the pressure testing plug body (32), the plug taking part (33) is located in the gap hole section (213) and an annular gap is formed between the plug taking part (33) and the hole wall of the gap hole section (213); a plug taking hole (331) is arranged in the plug taking part (33), the plug taking hole (331) has a hole opening at the upper end of the plug taking part (33), and a plug taking structure for connecting with a taking and delivering tool is arranged on the hole wall of the plug taking hole (331).

6. The multi-functional tubing plug valve of claim 5, wherein: a drainage hole (332) for connecting the annular gap and the plug taking hole (331) is arranged on the side wall of the plug taking part (33), and the drainage hole (332) is located at the lower side of the plug taking structure.

7. The multi-functional tubing plug valve of claim 6, wherein: a chamfer structure is arranged at the upper end edge of the plug taking part (33); and / or, the hole opening of the plug taking hole (331) is a reverse tapered hole (333); and / or, the plug taking structure is an internal thread.

8. The multi-functional tubing plug valve of any one of claims 1 to 7, wherein: the passage section of the central passage in the lower joint (5) is a lower joint central hole (51); the plug member (6) is detachably arranged in the lower joint central hole (51) through a plug releasing member.

9. The multi-functional tubing plug valve of claim 8, wherein: a pin groove (61) is arranged on the outer wall of the plug member (6); the plug releasing member is a shear pin (7), the shear pin (7) comprises a shear pin body installed in the side wall of the lower joint (5) and a shear pin head connected at the inner end of the shear pin body and inserted into the pin groove (61). In the axial direction of the plug (6), the size of the pin slot (61) is greater than the size of the pin head, so as to form an adjustable limiting structure with an axial movable gap, so that the plug (6) can be adjusted in axial position under the constraint of the adjustable limiting structure.

10. The multi-functional tubing plug valve of claim 8, wherein: Further comprising a pressure cap (8); The side wall of the lower connector (5) is provided with a flow hole (52) which communicates with the lower connector central hole (51) and is located at the lower side of the plug (6); The pressure cap (8) is detachably arranged at the lower end of the lower connector (5) and covers the second port, which is used to hold the falling plug (6).

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