A wellhead removal and retrieval device and mudline hanging system

Abstract

The utility model discloses a kind of abandoned well cap taking and sending device and mud line suspension system, it is related to well drilling testing operation field, wherein abandoned well cap taking and sending device includes shell, shell one end has the connecting cavity of accommodating abandoned well cap, and the clamping structure of being connected with abandoned well cap, the other end has the installation cavity being connected with drill rod, be equipped with in shell and be matched with the pressure switch in abandoned well cap presser, shell has the passageway being matched with pressure switch and being communicated with outside.There is mud line suspension system, including above-mentioned abandoned well cap taking and sending device and abandoned well cap, abandoned well cap connecting end has the pressure relief hole with pressure switch.This application reaches to facilitate taking and sending abandoned well cap, can effectively trigger pressure switch to realize corresponding function, and with better axial limit, sealing effect etc., guarantee the purpose that mud line suspension system stably operates.

Description

Technical Field

[0001] This utility model relates to the field of drilling test operation technology, and more specifically, to a well abandonment cap retrieval and mudline suspension system. Background Technology

[0002] In the process of oil and gas exploration and development, drilling testing is a core step in discovering potential oil and gas resources. Once commercially viable oil and gas reservoirs are detected, it becomes extremely important to implement temporary well abandonment procedures.

[0003] Temporary well abandonment is the final step in well exploration operations. The installation and retrieval of well abandonment caps is the most important part of the well abandonment operation. However, most well abandonment caps commonly used at underwater wellheads are installed and retrieved using mechanical delivery tools. Although this method can be applied to mudline suspension systems, its complex structure makes operation difficult, thus affecting the efficiency of well abandonment cap installation and retrieval.

[0004] In conclusion, how to reduce the operational difficulty of the retrieval and delivery tools to improve the installation and recycling efficiency of abandoned well caps is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a well cap retrieval and delivery device and a mud line suspension system, which effectively reduces the operational difficulty of the retrieval and delivery tools and improves the installation and recycling efficiency of well caps.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A device for retrieving and delivering abandoned well caps includes:

[0008] The housing has a connecting cavity at one end for accommodating the abandoned well cap, a snap-fit ​​structure for engaging with the abandoned well cap on the side of the housing near the abandoned well cap, and an installation cavity for connecting with the drill pipe at the other end of the housing.

[0009] A pressing element is disposed inside the housing, and the pressing element cooperates with a pressure switch inside the abandoned well cap so that the pressure switch is activated when the abandoned well cap moves along the connecting cavity. The housing is provided with a channel communicating with the outside of the housing and cooperating with the pressure switch.

[0010] Preferably, the snap-fit ​​structure includes a snap-fit ​​groove formed on the housing, and the snap-fit ​​groove forms an axial limit with the lug on the abandoned well cap;

[0011] The snap-fit ​​groove is provided with redundant space so that the lug has axial travel within the snap-fit ​​groove;

[0012] The end of the pressing element is axially spaced from the pressure switch, and the axial length of the redundant space is greater than the axial travel of the lug in the snap-fit ​​groove.

[0013] Preferably, the snap-fit ​​groove includes a first guide section extending axially along the housing and a second guide section extending circumferentially along the housing. The first guide section is connected to the second guide section. One end of the first guide section opposite to the second guide section passes through the end of the housing. The end of the second guide section is provided with a radially inwardly recessed limiting groove.

[0014] Preferably, the snap-fit ​​groove is an axially oriented waist-shaped hole, the lug is a hemispherical protrusion that can move radially via an elastic element, and the snap-fit ​​groove is wedge-shaped along the circumference of the housing.

[0015] Preferably, the pressing element is a vertical rod-shaped structure, with one end of the pressing element located on the inner wall of the mounting cavity and the other end of the pressing element located in the connecting cavity for pressing the pressure switch.

[0016] Preferably, the mounting cavity is provided with a locking member for fixing the pressing member.

[0017] Preferably, a sealing element is provided in the connecting cavity to seal the housing when it is connected to the abandoned well cap.

[0018] Preferably, the housing is provided with a liquid injection channel, which is opened in the axial direction and connects the mounting cavity and the connecting cavity.

[0019] A mudline suspension system includes a well cap and a well cap delivery device, wherein the well cap delivery device is a well cap retrieval and delivery device as described in any of the above claims, and the connecting end of the well cap is provided with a pressure relief hole, and a pressure switch triggered by the pressing element is provided in the pressure relief hole.

[0020] Preferably, the pressure switch includes a slider and a return spring sleeved on the slider, the slider having a pressure-receiving plane adapted to the end of the pressing member, and the preload of the return spring being in the opposite direction to the movement direction of the pressing member;

[0021] The housing has a tapered sealing surface at one end of the pressure relief hole near the sliding member, which is sealed to the sliding member. The tapered angle of the tapered sealing surface gradually decreases toward the pressing member.

[0022] The well cap retrieval and delivery device provided by this utility model allows for the activation of a pressure switch by a pressing component when the well cap moves along the connecting cavity. Simultaneously, the channel on the housing connecting to the outside also engages with the pressure switch. This enables the adjustment of oil and gas pressure between the well cap and the wellhead, and outside the housing, using the pressure switch during installation or retrieval of the well cap. Furthermore, the snap-fit ​​structure facilitates a quick connection between the housing and the well cap, effectively simplifying the connection steps, reducing operational difficulty, and improving the installation and retrieval efficiency of the well cap. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the connection between the well cap retrieval and the well cap in this embodiment;

[0025] Figure 2 This is a cross-sectional structural diagram showing the connection between the well cap retrieval and the well cap in this embodiment.

[0026] Figures 1-2 In the accompanying drawings, the reference numerals include:

[0027] 1. Housing; 11. Snap-fit ​​structure; 111. Connecting cavity; 112. Snap-fit ​​groove; 1121. First guide section; 1122. Second guide section; 1123. Limiting groove; 113. Redundancy space; 12. Mounting cavity; 13. Locking element; 14. Liquid injection channel; 15. Sealing element;

[0028] 2. Pressing component;

[0029] 3. Discard cap; 31. Connecting end; 32. Lug; 33. Pressure switch; 331. Sliding part; 332. Return spring. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. Embodiments of this application disclose a wellhead cap retrieval and delivery device and a mudline suspension system.

[0032] The core of this utility model is to provide a device for retrieving and delivering abandoned well caps.

[0033] Another core aspect of this invention is to provide a mudline suspension system, including the aforementioned well cap retrieval and delivery device.

[0034] Please refer to Figure 1 and Figure 2 .

[0035] The well cap retrieval and delivery device provided by this utility model includes a housing 1 and a pressing member 2. One end of the housing 1 has a connecting cavity 111 for accommodating the well cap 3. The side of the housing 1 near the well cap 3 is provided with a snap-fit ​​structure 11 for engaging with the well cap 3. The other end of the housing 1 has an installation cavity 12 for connecting with the drill pipe. The pressing member 2 is disposed inside the housing 1 and cooperates with a pressure switch 33 inside the well cap 3 so that the pressure switch 33 is activated when the well cap 3 moves along the connecting cavity 111. The housing 1 is provided with a channel communicating with the outside of the housing 1 and cooperating with the pressure switch 33.

[0036] Specifically, the connecting cavity 111 at one end of the housing 1 is recessed to accommodate the abandoned well cap 3. The side closest to the abandoned well cap 3 is engaged with it via a snap-fit ​​structure 11. The mounting cavity 12 at the other end connects to the drill pipe, and the pressing element 2 is located inside the housing 1. When the abandoned well cap 3 moves along the connecting cavity 111, the pressing element 2 cooperates with the pressure switch 33 inside the abandoned well cap 3 to activate the pressure switch 33. Simultaneously, the channel on the housing 1 communicating with the outside also cooperates with the pressure switch 33. This allows the pressure switch 33 to adjust the oil and gas pressure between the abandoned well cap 3 and the wellhead, and outside the housing 1, during the installation or retrieval of the abandoned well cap 3. This effectively simplifies the connection steps between the abandoned well cap 3 and the device, reduces operational difficulty, and improves the installation and retrieval efficiency of the abandoned well cap 3.

[0037] The aforementioned wellhead cap retrieval and delivery device connects the housing 1 and the wellhead cap 3 via a snap-fit ​​structure 11, simplifying the connection process and reducing operational difficulty. During the installation or retrieval of the wellhead cap 3, the pressure switch is triggered by the pressing component 2 to adjust the oil and gas pressure between the wellhead cap 3 and the wellhead, enabling the wellhead cap 3 to be installed or retrieved smoothly. Compared to existing retrieval and delivery tools with complex structures and difficult operations, this device has a more convenient structure and operation method, eliminates the need for underwater robot operations, reduces production and on-site operation time and costs, and improves work efficiency.

[0038] The abandoned well cap retrieval and delivery device provided by this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0039] In one specific implementation, reference is made to... Figure 2 The mounting cavity 12 is used to connect the housing 1 to the drill pipe. The mounting cavity 12 is tapered, and its inner diameter gradually decreases from the mounting cavity 12 towards the connecting cavity 111. The drill pipe is threaded to the mounting cavity 12, and the drilling pipe drives the housing 1 to move, thereby realizing the installation and retraction of the well abandonment cap 3.

[0040] Based on any of the above embodiments, refer to Figure 1 and Figure 2 The snap-fit ​​structure 11 includes a snap-fit ​​groove 112 formed on the housing 1, and the snap-fit ​​groove 112 and the lug 32 on the abandoned well cap 3 form an axial limit; a redundant space 113 is provided in the snap-fit ​​groove 112 so that the lug 32 has an axial travel in the snap-fit ​​groove 112; the end of the pressing member 2 is axially spaced from the pressure switch 33, and the axial length of the redundant space 113 is greater than the axial travel of the lug 32 in the snap-fit ​​groove 112.

[0041] Specifically, the snap-fit ​​groove 112 is formed on the housing 1, forming an axial limit with the lug 32 on the abandoned well cap 3, thus fixing their relative positions in the axial direction. A redundant space 113 within the snap-fit ​​groove 112 allows the lug 32 to have axial travel within the groove. The end of the pressing member 2 is axially spaced from the pressure switch 33, and the axial length of the redundant space 113 is greater than the axial travel of the lug 32 within the snap-fit ​​groove 112. During the movement of the abandoned well cap 3 along the connecting cavity 111, when the lug 32 moves axially to a certain extent within the redundant space 113, the pressing member 2 can touch and activate the pressure switch 33. This allows the channel on the housing 1 communicating with the outside to cooperate with the pressure switch 33, adjusting the oil and gas pressure between the abandoned well cap 3 and the wellhead, and outside the housing 1, facilitating the installation and recovery of the abandoned well cap 3.

[0042] Furthermore, the snap-fit ​​groove 112 includes a first guide section 1121 extending axially along the housing 1 and a second guide section 1122 extending circumferentially along the housing 1. The first guide section 1121 and the second guide section 1122 are connected. One end of the first guide section 1121 facing away from the second guide section 1122 passes through the end of the housing 1. The end of the second guide section 1122 is provided with a radially inwardly recessed limiting groove 1123.

[0043] Specifically, the snap-fit ​​groove 112 is a bent through groove. The first guide section 1121 of the snap-fit ​​groove 112 extends axially and passes through one end near the abandoned well cap 3, so that the lug 32 can enter the snap-fit ​​groove 112 through this port. By moving along the axial direction of the housing 1 through the snap-fit ​​groove 112, not only can the abandoned well cap 3 be connected to the housing 1, but the pressure switch 33 and the pressing element 2 can also gradually move closer. The second guide section 1122 is opened in the housing 1 circumferentially, and one end of the second guide section 1122 is connected to the side of the first guide section 1121 away from the port, so that the snap-fit ​​groove 112 is L-shaped. The second guide section 1122 can limit the position of the lug 32 in the axial direction, preventing the lug 32 from sliding out of the snap-fit ​​groove 112 through the first guide section 1121 during installation or retraction, which would cause the housing 1 to detach from the abandoned well cap 3 and cause construction accidents.

[0044] The diameter of the limiting groove 1123 is matched with the outer diameter of the lug 32. The limiting groove 1123 limits the position of the lug 32 within the snap-fit ​​groove 112. The limiting groove 1123 is located on the side of the second guide section 1122 near the abandoned well cap 3 to prevent the lug 32 from moving along the second guide section 1122 and affecting the connection stability between the housing 1 and the abandoned well cap 3. The limiting groove 1123 is located at the end of the second guide section 1122 away from the first guide section 1121 to prevent the lug 32 from slipping into the first guide section 1121 during adjustment within the redundant space 113, thereby further improving the connection stability between the housing 1 and the abandoned well cap 3.

[0045] In some other embodiments, the snap-fit ​​groove 112 may also be a waist-shaped hole arranged in the axial direction, and the lug 32 is a hemispherical protrusion that can move in the radial direction by means of an elastic element. The snap-fit ​​groove 112 is wedge-shaped in the circumferential direction, that is, the thickness of the inner wall of the housing 1 near the snap-fit ​​groove 112 in the circumferential direction gradually decreases, and the thickness of the inner wall of the snap-fit ​​groove 112 away from the abandoned well cap 3 gradually decreases. By snapping and limiting the lug 32 at the end of the snap-fit ​​groove 112 near the abandoned well cap 3, it is prevented that the abandoned well cap 3 will detach from the housing 1 when the abandoned well cap 3 is connected to the housing 1 by the radial contraction of the lug 32. By setting the thickness of the other three end faces of the snap-fit ​​groove 112 to a wedge shape, so that the wedge-shaped surface is tangent to the outer wall of the lug 32, the lug 32 can be contracted in the radial direction and retracted into the connecting cavity 111, so that the housing 1 and the abandoned well cap 3 can be separated after installation or retraction.

[0046] Based on any of the above embodiments, refer to Figure 2 The pressing element 2 is a vertical rod-shaped structure. One end of the pressing element 2 is located on the inner wall of the mounting cavity 12, and the other end of the pressing element 2 is located in the connecting cavity 111 for pressing the pressure switch 33.

[0047] Specifically, the pressing member 2 is rod-shaped. One end of the pressing member 2 is located in the mounting cavity 12, and the other end extends through the connecting channel into the connecting cavity 111. When the abandoned well cap 3 is connected to the housing 1, the end of the pressing member 2 extending into the connecting cavity 111 can press the pressure switch 33 of the abandoned well cap 3.

[0048] In one specific embodiment provided in this application, a locking member 13 for fixing the pressing member 2 is provided in the mounting cavity 12.

[0049] Specifically, the locking member 13 can be a bolt, which is connected to the end of the pressing member 2 located in the mounting cavity 12, and the outer wall of the bolt is connected to the inner wall of the mounting cavity 12 to limit the position of the pressing member 2 in the mounting cavity 12, so as to prevent the pressing member 2 from shaking during the installation or retraction of the abandoned well cap 3, which would prevent the pressure switch 33 from being accurately triggered and affect the construction progress.

[0050] Based on any of the above embodiments, refer to Figure 2 A sealing element 15 is provided in the connecting cavity 111 to seal the housing 1 and the abandoned well cap 3 when they are in the connected state.

[0051] Specifically, the sealing element 15 can be a sealing ring made of materials such as silicone or rubber. By setting a sealing ring on the outer wall of the well abandonment cap 3 or the inner wall of the connecting cavity 111, the corrosion inhibitor is prevented from flowing out through the gap between the well abandonment cap 3 and the shell 1 during the injection of corrosion inhibitor. This not only effectively reduces the waste of corrosion inhibitor, but also reduces pollution to oil and gas drilling.

[0052] Based on any of the above embodiments, the anti-corrosion liquid is injected through the injection channel 14 provided in the housing 1. The injection channel 14 is opened in the axial direction and is connected between the mounting cavity 12 and the connecting cavity 111.

[0053] Specifically, the injection channel 14 is used to connect the installation cavity 12 and the connecting cavity 111, and when the abandoned well cap 3 is connected to the shell 1, the installation cavity 12 can communicate with the inside of the abandoned well cap 3 through the injection channel 14.

[0054] Multiple injection channels 14 are arranged along the circumferential direction of the shell 1. With the two opposite ends of the shell 1 connected to the drill pipe and the well cap 3 respectively, the anti-corrosion fluid can be injected through the drill pipe. The anti-corrosion fluid flows out through the drill pipe and flows through the installation cavity 12, the injection channel 14, and the connecting cavity 111 in sequence until it enters the well cap 3. The anti-corrosion fluid effectively reduces the erosion of the well cap 3 caused by oil and gas, effectively prolongs the service life of the well cap 3, and improves the well sealing effect of the well cap 3.

[0055] The working process of installing the well cap 3 using a well cap retrieval and delivery device according to an embodiment of this application is as follows:

[0056] During the installation of the well abandonment cap 3, the end of the housing 1 facing away from the connecting cavity 111 is threadedly connected to the drill pipe. The drill pipe drives the housing 1 to move, causing the connecting cavity 111 to gradually approach and fit onto the well abandonment cap 3. The lug 32 on the well abandonment cap 3 is embedded in the snap-fit ​​groove 112. The end of the housing 1 with the connecting cavity 111 is placed on the well abandonment cap 3, and the well abandonment cap 3 is rotated clockwise, causing the lug 32 on the well abandonment cap 3 to move along the snap-fit ​​groove 112, achieving snap-fit ​​and thus connecting the housing 1 and the well abandonment cap 3.

[0057] With the wellhead cap 3 connected to the casing 1, the drill pipe drives the casing 1 and the wellhead cap 3 to move, causing the wellhead cap 3 to gradually descend and approach the wellhead. During the descent, the oil and gas pressure between the wellhead cap 3 and the wellhead is less than the weight of the wellhead cap 3 as it descends, allowing the wellhead cap 3 to gradually approach the wellhead. As the wellhead cap 3 gradually descends, the oil and gas pressure between the wellhead cap 3 and the wellhead gradually increases. When the oil and gas pressure between the wellhead cap 3 and the wellhead is equal to or greater than the weight of the wellhead cap 3 as it descends, the wellhead cap 3 stops descending. In this state, the drill pipe continues to drive the casing 1 to descend, causing the casing 1 to continue moving relative to the wellhead cap 3 from the drill pipe toward the wellhead cap 3. The redundant space 113 allows the lug 32 to move from the wellhead toward the casing 1 within the snap-fit ​​groove 112. The connecting cavity 111 of the housing 1 is connected to the outside of the housing 1 through the channel between the two. When the abandoned well cap 3 is stationary and the housing 1 continues to move downward, the pressing member 2 inside the housing 1 gradually approaches the pressure switch 33 of the abandoned well cap 3 until the pressing member 2 presses the pressure switch 33, the pressure switch 33 is triggered, so that the oil and gas between the abandoned well cap 3 and the wellhead are released into the connecting cavity 111 and connected to the outside of the housing 1 through the connecting channel, so that the oil and gas pressure between the abandoned well cap 3 and the wellhead is reduced.

[0058] The oil and gas pressure between the wellhead and the wellhead is less than the weight of the wellhead as it descends, allowing the wellhead to continue moving closer to the wellhead until it is placed at the preset position. Whether the wellhead has been placed at the preset position can be confirmed by the distance the drill pipe has been lowered.

[0059] The working process of separating the housing 1 and the well-dumping cap 3 after the installation of the well-dumping cap retrieval and delivery device according to an embodiment of this application is as follows:

[0060] Rotating the housing 1 counterclockwise allows the lug 32 to slide out of the locking groove 112, thus disconnecting the housing 1 from the well cap 3. This simple operation simplifies the connection and disassembly steps and effectively improves work efficiency.

[0061] The working process of the well cap retrieval and delivery device in this embodiment of the application for recovering the well cap 3 is as follows:

[0062] Connect the end of the housing 1 away from the connecting cavity 111 to the drill pipe. The drill pipe drives the housing 1 to gradually approach the abandoned well cap 3 until the lug 32 is embedded in the snap-fit ​​groove 112, thus realizing the connection between the housing 1 and the abandoned well cap 3.

[0063] The connecting cavity 111 is connected to the outside of the casing 1 through a connecting channel. The oil and gas pressure between the abandoned well cap 3 and the wellhead is lower than the pressure inside the connecting cavity 111, making it more difficult to recover the abandoned well cap 3. In this state, the drill pipe drives the casing 1 to continue moving from the casing 1 towards the abandoned well cap 3, causing the pressing element 2 inside the casing 1 to gradually approach until it presses the pressure switch 33. The pressure switch 33 is triggered, making the abandoned well cap 3 connected to the connecting cavity 111, thereby balancing the oil and gas pressure between the abandoned well cap 3 and the wellhead, so that the abandoned well cap 3 can be pulled from the wellhead towards the casing 1, thus realizing the recovery of the abandoned well cap 3.

[0064] The implementation principle of the wellhead cap retrieval and delivery device in this application embodiment is as follows: The device connects the housing 1 and the wellhead cap 3 through a snap-fit ​​structure, simplifying the connection steps and reducing operational difficulty. During the installation or retrieval of the wellhead cap, the pressure switch 33 is triggered by the pressing component 2 to adjust the oil and gas pressure between the wellhead cap 3 and the wellhead, enabling the wellhead cap 3 to be installed or retrieved smoothly. Compared with the complex structure and difficult operation of existing retrieval and delivery tools, this device has a more convenient structure and operation method, does not require underwater robot operation, reduces production and on-site operation time and costs, and improves work efficiency.

[0065] The mudline suspension system provided by this utility model includes a well-discarding cap 3 and a well-discarding cap delivery device. The well-discarding cap delivery device is the aforementioned well-discarding cap receiving and delivery device. The connecting end 31 of the well-discarding cap 3 is provided with a pressure relief hole, and a pressure switch 33 triggered by the pressing component 2 is provided in the pressure relief hole.

[0066] Specifically, the well-dump cap 3 has multiple lugs 32 arranged along its circumferential direction. A snap-fit ​​groove 112 is provided on the side of the housing 1 that connects to the well-dump cap 3. These multiple snap-fit ​​grooves 112 are arranged along the circumferential direction of the housing 1 and correspond one-to-one with the lugs 32. By setting multiple snap-fit ​​grooves 112 to connect with the lugs 32 of the well-dump cap 3, not only can the connection stability between the housing 1 and the well-dump cap 3 be improved, preventing the well-dump cap 3 or the housing 1 from tilting during installation or retrieval, thus avoiding situations such as the well-dump cap 3 getting stuck, but it also facilitates matching any one of the snap-fit ​​grooves 112 with any one of the lugs 32 to achieve a limiting fit between the lug 32 and the snap-fit ​​groove 112. Compared to a single snap-fit ​​groove 112 and lug 32, setting multiple snap-fit ​​grooves 112 corresponding one-to-one with the lugs 32 effectively reduces the connection difficulty between the housing 1 and the well-dump cap 3, improving work efficiency.

[0067] Taking the snap-fit ​​groove 112 of the first guide section 1121 as an example, the abandoned well cap 3 has a protruding connecting end 31 on the side near the housing 1. The outer diameter of the connecting end 31 is adapted to the inner diameter of the connecting cavity 111. Multiple lugs 32 are provided on the outer circumferential surface of the top of the connecting end 31. When the connecting end 31 is embedded in the connecting cavity 111, the lugs 32 move along the first guide section 1121 and drive the housing 1 to rotate clockwise via the drill pipe, causing the lugs 32 to enter the second guide section 1122 and move into the limiting groove 1123 to limit the position of the lugs 32 within the housing 1, thereby improving the connection stability between the housing 1 and the abandoned well cap 3. Figures 1 to 2 As shown, the connecting end 31 of the abandoned well cap 3 has a through hole arranged in the axial direction, which is connected to the wellhead through a pressure switch 33.

[0068] The aforementioned mudline suspension system combines the advantages of a well abandonment cap retrieval device, enabling convenient installation and recovery of the well abandonment cap. The pressure switch 33 is designed to effectively regulate the oil and gas pressure between the well abandonment cap 3 and the wellhead, ensuring the smooth operation of the well abandonment operation.

[0069] The mudline suspension system provided by this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0070] Based on any of the above embodiments, the pressure switch 33 includes a slider 331 and a return spring 332 sleeved on the slider 331. The slider 331 has a pressure-receiving plane adapted to the end of the pressing member 2. The preload of the return spring 332 is opposite to the movement direction of the pressing member 2. The housing 1 has a conical sealing surface at the end of the pressure relief hole near the slider 331, which is sealed to the slider 331. The cone angle of the conical sealing surface gradually decreases toward the pressing member 2.

[0071] Specifically, the pressure switch 33 consists of a return spring 332 and a sliding member 331 installed in the through hole. The return spring 332 can elastically deform in the axial direction within the through hole to push the sliding member 331 to move from the wellhead cap 3 towards the housing 1. The conical sealing surface ensures better sealing when the pressure switch is closed, preventing oil and gas leakage.

[0072] When the connecting end 31 is embedded in the connecting cavity 111, the end of the pressing member 2 located in the connecting cavity 111 is embedded in the through hole, and this end can press and trigger the pressure switch 33. By pressing the sliding member 331 downward by the pressing member 2, a gap is formed between the top of the sliding member 331 and the inner wall of the through hole, so that the space formed between the abandoned well cap 3 and the wellhead is connected to the outside of the housing 1 through the connecting cavity 111, thereby realizing the adjustment of the oil and gas pressure between the abandoned well cap 3 and the wellhead, so as to facilitate the installation or retrieval of the abandoned well cap 3.

[0073] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0074] The above provides a detailed description of the well cap retrieval and mud line suspension system provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A device for retrieving and delivering abandoned well caps, characterized in that, include: The housing (1) has a connecting cavity (111) at one end for accommodating the abandoned well cap (3), and a snap-fit ​​structure (11) for snapping with the abandoned well cap (3) is provided on the side of the housing (1) near the abandoned well cap (3). The other end of the housing (1) has an installation cavity (12) for connecting with the drill pipe. The pressing element (2) is disposed inside the housing (1), and the pressing element (2) cooperates with the pressure switch (33) inside the abandoned well cap (3) so that the pressure switch (33) is opened during the movement of the abandoned well cap (3) along the connecting cavity (111). The housing (1) is provided with a channel communicating with the outside of the housing (1) and cooperates with the pressure switch (33).

2. The well cap retrieval and delivery device according to claim 1, characterized in that, The snap-fit ​​structure (11) includes a snap-fit ​​groove (112) formed on the housing (1), and the snap-fit ​​groove (112) and the lug (32) on the abandoned well cap (3) form an axial limit; The snap-fit ​​groove (112) is provided with a redundant space (113) so that the lug (32) has an axial travel within the snap-fit ​​groove (112); The end of the pressing member (2) is axially spaced from the pressure switch (33), and the axial length of the redundant space (113) is greater than the axial travel of the lug (32) in the snap-fit ​​groove (112).

3. The well cap retrieval and delivery device according to claim 2, characterized in that, The snap-fit ​​groove (112) includes a first guide section (1121) extending axially along the housing (1) and a second guide section (1122) extending circumferentially along the housing (1). The first guide section (1121) and the second guide section (1122) are connected. One end of the first guide section (1121) facing away from the second guide section (1122) passes through the end of the housing (1). The end of the second guide section (1122) is provided with a radially recessed limiting groove (1123).

4. The well cap retrieval and delivery device according to claim 2, characterized in that, The snap-fit ​​groove (112) is a waist-shaped hole arranged in the axial direction, and the lug (32) is a hemispherical protrusion that can move in the radial direction through an elastic element. The snap-fit ​​groove (112) is wedge-shaped along the circumference of the housing (1).

5. The well cap retrieval and delivery device according to claim 1, characterized in that, The pressing member (2) is a vertical rod-shaped structure. One end of the pressing member (2) is located on the inner wall of the mounting cavity (12), and the other end of the pressing member (2) is located in the connecting cavity (111) for pressing the pressure switch (33).

6. The well cap retrieval and delivery device according to claim 5, characterized in that, The mounting cavity (12) is provided with a locking member (13) for fixing the pressing member (2).

7. The well cap retrieval and delivery device according to claim 1, characterized in that, A sealing element (15) is provided in the connecting cavity (111) for sealing when the housing (1) and the abandoned well cap (3) are in a connected state.

8. The well cap retrieval and delivery device according to any one of claims 1-7, characterized in that, The housing (1) is provided with a liquid injection channel (14), which is opened in the axial direction and is connected between the mounting cavity (12) and the connecting cavity (111).

9. A mudline suspension system, comprising a well-dump cap (3) and a well-dump cap delivery device, characterized in that, The well-dump cap delivery device is the well-dump cap delivery device as described in any one of claims 1-8. The connection end (31) of the well-dump cap (3) is provided with a pressure relief hole, and a pressure switch (33) triggered by the pressing member (2) is provided in the pressure relief hole.

10. The mudline suspension system according to claim 9, characterized in that, The pressure switch (33) includes a slider (331) and a return spring (332) sleeved on the slider (331). The slider (331) has a pressure-receiving plane adapted to the end of the pressing member (2). The preload of the return spring (332) is opposite to the movement direction of the pressing member (2). The housing (1) has a conical sealing surface at one end of the pressure relief hole near the sliding member (331) that is in sealing cooperation with the sliding member (331). The cone angle of the conical sealing surface gradually decreases toward the pressing member (2).

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