Wellhead mud blowout prevention sealing device

Abstract

The application discloses a wellhead mud blowout prevention sealing device, which comprises a hollow cylindrical upper cylinder, wherein the upper cylinder is made of a high polymer material; the upper cylinder is enclosed by a left shell and a right shell; the left shell and the right shell are hingedly connected on one side and are buckled on the other side through a buckle; the opposite surfaces of the left shell and the right shell are mutually adhered and are provided with sealing structures; the sealing structure comprises a convex rib arranged in an axial direction and a groove corresponding to the convex rib; a sealing groove is formed between the convex rib and the groove bottom; and a sealing strip is arranged in the sealing groove; the opposite surfaces of the left shell and the right shell are provided with the convex rib and the groove respectively. The device can be installed, disassembled, internally inspected and maintained by one person, thereby reducing the working strength of the operator; the sealing is reliable, and the mud is effectively prevented from being sprayed or leaked; and the modular design and the upper and lower split structure can be applicable to two working conditions of straight mud discharge and side mud discharge.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling technology, specifically relating to a wellhead mud blowout prevention sealing device. Background Technology

[0002] In oil drilling operations, the tripping in and out of the well is an essential procedure. During this process, a large amount of mud adheres to the drill pipe surface. If it is not effectively sealed and collected, the mud will gush out from the wellhead, forming "mud rain," causing serious environmental pollution and safety hazards at the work site. Therefore, currently, a simple steel blowout preventer is used at the front end of the tripping in process to prevent the jetting of mud and wastewater. However, in long-term use, traditional steel blowout preventers have mainly revealed problems such as bulky structure, poor sealing performance, and high workload for operators. Summary of the Invention

[0003] The purpose of this invention is to provide a wellhead mud blowout prevention sealing device that is simple in structure, reliable in sealing, and easy to operate, so as to solve the problems of bulky structure and high labor intensity of operators in the existing technology.

[0004] The technical solution adopted in this invention is as follows: a wellhead mud blowout prevention sealing device, comprising a hollow cylindrical upper cylinder made of polymer material; the upper cylinder is formed by a left shell and a right shell, the left shell and the right shell are hinged on one side and fastened by a snap fastener on the other side, the opposite surfaces of the left shell and the right shell are in contact with each other and are provided with a sealing structure; the sealing structure includes a convex rib arranged along the axial direction and a groove corresponding to accommodate the convex rib, a sealing groove is formed between the convex rib and the bottom of the groove, and a sealing strip is installed in the sealing groove; on the opposite surfaces of the left shell and the right shell, one is provided with the convex rib and the other is provided with the groove.

[0005] As a further optional solution, the outer peripheral walls of the hinge side of the left and right shells are axially spaced with outward protrusions, and the outward protrusions are provided with axially penetrating hinge holes. The outward protrusions of the left and right shells alternate with each other, and the hinge holes are sequentially connected to each other.

[0006] As a further optional solution, a lower cylinder is also included, which is spliced ​​to the lower end of the upper cylinder. The lower cylinder is made of the same material and has the same structure as the upper cylinder, and the lower cylinder also has a side outlet arranged radially.

[0007] As a further optional solution, the lower end face of the upper cylinder is provided with a slot for splicing the lower cylinder, and the upper end of the lower cylinder is a plug-in end adapted to the slot.

[0008] As a further optional solution, the insertion end of the lower cylinder also has a stepped surface, which is used to fit and limit the fit with the lower end surface of the upper cylinder after splicing.

[0009] As a further optional feature, the inner wall of the upper cylinder has reinforcing ribs that are staggered along the circumferential and axial directions.

[0010] As a further optional feature, handles are provided on the outer walls of both the left and right housings.

[0011] The beneficial effects of this invention are: 1. The device of this invention uses an upper cylinder made of polymer material, which significantly reduces the overall weight compared to traditional steel structure blowout shields, making it easier to transport and install. Furthermore, the upper cylinder features an openable structure with the left and right shells hinged together and the other side connected by a snap fastener. This eliminates the need for hoisting equipment, allowing a single person to complete the installation, disassembly, internal inspection, and maintenance of the device, greatly shortening non-productive time and reducing the workload of operators.

[0012] 2. The mating surfaces of the left and right shells are equipped with a combined sealing structure consisting of ribs, grooves, and sealing strips. A sealing groove is formed between the bottom of the ribs and the grooves, and the sealing strip is installed in the groove. When the left and right shells are fastened together, the sealing strip is pressed tightly to form a reliable seal, which can effectively prevent mud from spraying out or leaking from the parting surface, avoid the "mud rain" phenomenon at the wellhead, improve the working environment, and reduce drilling fluid waste.

[0013] 3. The interlocking of the ribs and grooves not only accommodates the sealing strip but also serves as a guide during assembly, ensuring accurate alignment of the left and right shells and preventing seal failure due to misalignment. Simultaneously, the interlocking of the ribs and grooves enhances the structural stability after mold closing. The polymer material possesses high wear resistance and elasticity, effectively sealing slurry.

[0014] 4. By incorporating a modular lower cylinder with a side discharge port, this device allows for selection of either a direct mud discharge mode (using only the upper cylinder) or a side mud discharge mode (with the lower cylinder attached) as needed. The lower and upper cylinders are made of the same material and have the same structure, ensuring good versatility. Furthermore, the use of slots and plug-in connections makes assembly simple and reliable. This modular design, with its separate upper and lower sections, is suitable for both direct and side mud discharge applications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the wellhead mud blowout prevention sealing device provided in an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the wellhead mud blowout prevention sealing device provided in an embodiment of the present invention from another perspective; Figure 3 yes Figure 1 Top view; Figure 4 This is a partial cross-sectional view of the splicing section of the wellhead mud blowout prevention sealing device provided in an embodiment of the present invention.

[0016] In the diagram: 1-Upper cylinder; 2-Lower cylinder; 3-Left shell; 4-Right shell; 5-Snap fastener; 6-Protruding rib; 7-Groove; 8-Sealing groove; 9-Outer protrusion; 10-Hinge hole; 11-Side outlet; 12-Slot; 13-Reinforcing rib; 14-Handle. Detailed Implementation

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The technical solutions provided by the present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the descriptions of these embodiments are for the purpose of helping to understand the present invention, but do not constitute a limitation thereof. In some examples, because some implementation methods are existing or conventional technologies, they are not described or are not described in detail.

[0019] Furthermore, the technical features described herein, or the steps in all the methods or processes disclosed herein, may be combined in any suitable manner in one or more embodiments, except for mutually exclusive features and / or steps. It will be readily understood by those skilled in the art that the order of steps or operations of the methods relating to the embodiments provided herein may also be altered. Any order in the drawings and embodiments is for illustrative purposes only and does not imply a requirement to follow a particular order unless explicitly stated otherwise.

[0020] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, under reasonable circumstances (without self-contradiction), include both direct and indirect connections (linkages).

[0021] Figures 1 to 4This invention illustrates a wellhead mud blowout prevention sealing device provided in an embodiment of the present invention. It includes a hollow cylindrical upper cylinder 1, which is integrally molded from a polymer material, such as polyurethane, nylon, or polyethylene, and has advantages such as light weight, corrosion resistance, wear resistance, and aging resistance. The upper cylinder 1 is formed by a left shell 3 and a right shell 4. The left shell 3 and right shell 4 are hinged on one side and fastened together on the other side by a snap fastener 5. The opposing surfaces of the left shell 3 and right shell 4 are in contact with each other and are each provided with a sealing structure. The sealing structure includes axially arranged ribs 6 and corresponding grooves 7 for accommodating the ribs 6. A sealing groove 8 is formed between the ribs 6 and the bottom of the grooves 7, and a sealing strip is installed in the sealing groove 8. On the opposing surfaces of the left shell 3 and right shell 4, one is provided with a rib 6 and the other with a groove 7.

[0022] The latch 5 can be purchased directly. Specifically, the latch 5 includes a latch fixed to the right housing 4 and a latch ring hinged to the left housing 3, along with a locking handle. By operating the locking handle, the left and right housings 4 can be quickly locked and opened. When the latch 5 is locked, the left housing 3 and right housing 4 press against each other, compressing the sealing strip and forming a reliable seal between the rib 6 and the groove 7. This effectively prevents mud from spraying out along the mating surface and ensures accurate alignment of the left and right housings 4, avoiding seal failure due to misalignment. The cross-sectional shape of the rib 6 and the groove 7 can be designed as rectangular, trapezoidal, or arc-shaped, as long as it forms a sealing groove 8 to accommodate the sealing strip.

[0023] Both the left housing 3 and the right housing 4 have axially spaced protrusions 9 on their hinged sides. Each protrusion 9 has an axially penetrating hinge hole 10. The protrusions 9 of the left housing 3 and the right housing 4 alternate, and the hinge holes 10 are sequentially connected. This ensures that all hinge holes 10 are sequentially connected. A single pin passes through all the hinge holes 10, thus achieving the hinge between the left housing 3 and the right housing 4. This increases the hinge length and the force-bearing area, resulting in a strong hinge and smooth opening and closing. Furthermore, the protrusions 9 are located on the outside of the sealing structure, ensuring reliable sealing while achieving the hinge.

[0024] This device can also be equipped with a lower cylinder 2 according to the needs of the site conditions. That is, this device also includes a lower cylinder 2 spliced ​​to the lower end of the upper cylinder 1. The lower cylinder 2 has the same material and structure as the upper cylinder 1, the difference being that the lower cylinder 2 additionally has a radially arranged side outlet 11. The side outlet 11 is used to connect to the recovery pipeline of the side-discharge operation, guiding the slurry to the recovery system from the side. The lower end face of the upper cylinder 1 has a slot 12 for splicing the lower cylinder 2, and the upper end of the lower cylinder 2 is a plug-in end adapted to the slot 12. During assembly, the plug-in end is inserted into the slot 12 to achieve quick splicing of the upper and lower cylinders 2. To prevent slurry leakage from the splicing point, a sealing ring or other sealing structure can be installed at the splicing point. In addition, the plug-in end of the lower cylinder 2 may also have a stepped surface, which is used to fit and limit the lower end face of the upper cylinder 1 after splicing, serving as a limiting and auxiliary sealing function.

[0025] When direct mud discharge is required, only the upper cylinder 1 is used. The upper cylinder 1 is installed at the wellhead, and the drill pipe passes through the center of the upper cylinder 1. The mud falls directly from the lower end into the wellhead recovery tank. When side discharge of mud is required, the lower cylinder 2 is spliced ​​below the upper cylinder 1. The lower end opening of the lower cylinder 2 is sealed or it is sealed to the wellhead. The mud is pumped from the side discharge port 11 through the pipeline to the recovery device.

[0026] When using this device, first open the latch 5, then unwind the left housing 3 and right housing 4 and place them over the outside of the drill rod. Then close the left and right housings 4 and fasten the latch 5 to compress the sealing strip. If you need to replace the internal sludge scraper core or perform maintenance, simply loosen the latch 5 to open the cylinder. This operation can be completed by a single person without the need for hoisting equipment.

[0027] To enhance the structural strength of the upper cylinder 1, reinforcing ribs 13 are provided on the inner walls of the upper cylinder 1 (i.e., the inner walls of the left shell 3 and the right shell 4), which are staggered along the circumference and axial direction. The reinforcing ribs 13 are integrally formed with the cylinder, improving the cylinder's resistance to compression and deformation without significantly increasing its weight. The lower cylinder 2 can be treated similarly. Handles 14 are provided on the outer walls of both the left shell 3 and the right shell 4 for easy opening and closing by operators. When the lower cylinder 2 is attached, since it is already fixed to the upper cylinder 1, handles 14 can be provided only on the upper cylinder 1.

[0028] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A wellhead mud blowout preventer sealing device, characterized in that, The device includes a hollow cylindrical upper cylinder made of polymer material. The upper cylinder is formed by a left shell and a right shell, which are hinged on one side and fastened together on the other side by a snap fastener. The opposite sides of the left and right shells are in contact with each other and are provided with a sealing structure. The sealing structure includes axially arranged ribs and corresponding grooves for receiving the ribs. A sealing groove is formed between the ribs and the bottom of the grooves, and a sealing strip is installed in the sealing groove. The ribs are provided on one of the opposite sides of the left and right shells, and the grooves are provided on the other side.

2. The wellhead mud blowout prevention sealing device according to claim 1, characterized in that, The outer peripheral walls of the hinge side of the left and right shells are axially spaced with outward protrusions, and the outward protrusions are provided with axially penetrating hinge holes. The outward protrusions of the left and right shells alternate with each other, and the hinge holes are sequentially connected to each other.

3. The wellhead mud blowout prevention sealing device according to claim 1 or 2, characterized in that, It also includes a lower cylinder that is spliced ​​to the lower end of the upper cylinder. The lower cylinder is made of the same material and has the same structure as the upper cylinder, and the lower cylinder also has a side outlet arranged radially.

4. The wellhead mud blowout prevention sealing device according to claim 3, characterized in that, The lower end face of the upper cylinder is provided with a slot for splicing the lower cylinder, and the upper end of the lower cylinder is a plug-in end that is adapted to the slot.

5. The wellhead mud blowout prevention sealing device according to claim 4, characterized in that, The insertion end of the lower cylinder also has a stepped surface, which is used to fit and limit the upper cylinder's lower end surface after splicing.

6. The wellhead mud blowout prevention sealing device according to claim 1, characterized in that, The inner wall of the upper cylinder has reinforcing ribs that are staggered along the circumference and axial direction.

7. The wellhead mud blowout prevention sealing device according to claim 1, characterized in that, Both the left and right shells are equipped with handles on their outer walls.

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