Special connecting guide pipe device for drilling platform

Abstract

The utility model discloses a drilling platform special connecting guide pipe device which comprises a connecting guide pipe, the connecting guide pipe comprises a casing pipe section and a pressing pipe section which are tightly connected, the diameter of the casing pipe section is larger than that of the pressing pipe section, a first sealing structure is arranged in the casing pipe section, a second sealing structure is arranged at the end of the pressing pipe section, and the casing pipe section is downwards pressed and arranged on the outer side of a reserved wellhead in a sleeving mode. The pressure pipe section can make contact with the end face of a wellhead, the first sealing structure can achieve sealing between the inner wall of the sleeve section and the outer wall of the wellhead, the second sealing structure can achieve sealing between the end of the pressure pipe section and the end face of the wellhead, a well drilling channel is established in a non-welding mode, and sparks possibly generated in the welding process are avoided; and a non-welding connection mode is adopted, so that the maintenance and overhaul processes are simpler and more convenient, and the maintenance cost and time are reduced. The efficiency and safety of drilling operation of the offshore oil and gas extraction platform are improved, and powerful technical support is provided for offshore oil and gas extraction.

Description

Technical Field

[0001] The present application belongs to the field of connecting conduits for offshore drilling platforms, and in particular relates to a special connecting conduit device for a drilling platform. Background Art

[0002] Offshore oil and gas platforms typically consist of multiple wells, ranging from 6 to 40 depending on the oil reserves. Within a well group, approximately 80% of the wells are used for production, while a portion are reserved for future development. When these reserved wells need to be developed, the drilling platform is towed to the side of the production platform and raised above it to establish a drilling channel between the two platforms. However, during drilling, the production wells on the original production platform must remain operational and cannot be shut down. Due to the presence of oil and gas, using spark-generating methods such as welding to establish a drilling channel is inefficient and poses safety risks, potentially leading to flash explosions. Therefore, strict safety measures must be implemented to ensure the safe conduct of drilling operations. This demonstrates that existing technologies require further improvement and enhancement. Utility Model Content

[0003] The utility model provides a special connecting conduit device for a drilling platform, which is used to solve the efficiency and safety problems of establishing a drilling channel faced by an offshore oil and gas production platform.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A special connecting conduit device for a drilling platform includes a connecting conduit, which includes a tightly connected casing section and a pressure pipe section. The diameter of the casing section is larger than that of the pressure pipe section. A first sealing structure is provided in the casing section, and a second sealing structure is provided at the end of the pressure pipe section. The casing section is pressed down and arranged on the outside of a reserved wellhead. The pressure pipe section can contact the end face of the wellhead. The first sealing structure can achieve a seal between the inner wall of the casing section and the outer wall of the wellhead. The second sealing structure can achieve a seal between the end face of the pressure pipe section and the end face of the wellhead. A sealed drilling channel is established in a non-welding manner to ensure that drilling fluid does not overflow during drilling.

[0006] The special connecting conduit device of the drilling platform of this application is usually adopted, and the installation process is made simpler and faster through the tight connection design of the casing section and the pressure pipe section. The casing section is pressed down and arranged on the outside of the reserved wellhead, and the pressure pipe section is in contact with the end face of the wellhead. The first sealing structure is located between the inner wall of the casing section and the outer wall of the wellhead, and the second sealing structure is located between the end of the pressure pipe section and the end face of the wellhead. This double sealing design ensures the high sealing of the drilling channel and effectively prevents the overflow of drilling fluid. The use of non-welding methods to establish the drilling channel avoids the sparks that may be generated during the welding process, thereby reducing safety hazards such as flash explosions. The use of non-welding connection methods makes the maintenance and overhaul process simpler and reduces maintenance costs and time. It improves the efficiency and safety of drilling operations on offshore oil and gas platforms and provides strong technical support for offshore oil and gas production.

[0007] In a preferred implementation, the first sealing structure is an O-ring, and multiple layers of the O-ring are provided on the inner wall of the casing section.

[0008] In a preferred implementation, a sealing groove is provided on the inner wall of the sleeve section, the sealing groove is a 24° single-sided dovetail groove, and an O-ring is provided in the sealing groove.

[0009] In a preferred implementation, the second sealing structure is a cone sealing device provided on the end face of the pressure pipe section, the center of the cone sealing device is connected to the interior of the pressure pipe section, and the cone sealing device can be inserted into the reserved wellhead to form an inner end face seal.

[0010] In a preferred implementation, one end of the compression pipe section is connected to the inner wall of the casing section, and a gap is formed between the cone sealing device and the inner wall of the casing section for the reserved wellhead end to be inserted.

[0011] In a preferred implementation, a pipe hanging section is provided on the upper portion of the pipe pressing section, and the pipe hanging section is provided with a hanging structure, which includes a hanging hole at the top and a hanging ear at the lower side of the hanging hole, so as to facilitate the hanging of the entire connecting conduit.

[0012] In a preferred implementation, the diameter of the pipe hanging section is larger than the diameter of the pipe pressing section, and a tapered transition section is provided between the two.

[0013] In a preferred implementation, the hanging pipe section is detachably connected to the rising pipe, and the end of the rising pipe is a hydraulic locking joint. The two are hydraulically locked to form a seal.

[0014] In a preferred implementation, the length of the casing section l 2 satisfies 1 meter ≤ l 1 ≤ 1.5 meters.

[0015] In a preferred implementation, the internal dimension of the connecting conduit is greater than 18 inches, meeting the through-drilling requirements of a 17.5-inch drill bit.

[0016] The above structure has the following beneficial effects:

[0017] 1. Can be realized in the field without fire, directly on the original water pipe, and form a seal.

[0018] 2. There are two sealing forms, so that the drilling fluid in the channel does not overflow, and is effectively recycled.

[0019] 3. The connection requirements of the field non-welding form are realized, and the safety and construction efficiency of the operation are improved.

[0020] 4. The top has two lifting holes. Two lifting lugs are welded 1.5 meters below the top of the pipe, which can be used as a backup lifting point. When the sleeve resistance is too large, the riser can be directly seated on the lifting lug, relying on the increase of the self weight to make the insertion smooth.

[0021] 5. The clamping height of the riser and the device is adjustable, the bottom can swallow the lifting lug of the device, and the adjustable height is 1.5 meters. The convenience of the lifting height of the drilling platform is increased, and the drilling footage is convenient to calculate. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A schematic embodiment of the special connection pipe device of the drilling platform is shown in the drawings.

[0024] Figure 2 A schematic embodiment of the special connection pipe device of the drilling platform is shown in the drawings.

[0025] Figure 3 A schematic embodiment of the special connection pipe device of the drilling platform is shown in the drawings.

[0026] Label explanation:

[0027] 1, casing section; 10, sealing groove; 11, first sealing structure; 2, pipe pressing section; 20, second sealing structure; 3, conical transition section; 4, pipe lifting section; 40, lifting hole; 41, lifting lug; 5, reserved wellhead. DETAILED DESCRIPTION

[0028] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0029] In the description of the present invention, it should be understood that the terms "center," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "axial," "radial," "circumferential," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the present invention, unless otherwise expressly specified or limited, a first feature being "up" or "down" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0030] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or an interaction between two components. However, the phrase "direct connection" indicates that the two connected entities are not connected through an intermediate structure, but are connected to form a whole through a connecting structure. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] In this utility model, terms such as "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0032] The present invention will be described below with reference to the accompanying drawings.

[0033] The specific plans adopted are:

[0034] like Figures 1-3 As shown, the utility model provides a special connecting catheter device for a drilling platform, including a connecting catheter, which includes a tightly connected casing section 1 and a pressure pipe section 2. The diameter of the casing section 1 is larger than the diameter of the pressure pipe section 2. A first sealing structure 11 is provided in the casing section 1, and a second sealing structure 20 is provided at the end of the pressure pipe section 2. The casing section 1 is pressed down and arranged on the outside of the reserved wellhead 5. The pressure pipe section 2 can contact the end face of the wellhead. The first sealing structure 11 can achieve a seal between the inner wall of the casing section 1 and the outer wall of the wellhead. The second sealing structure 20 can achieve a seal between the end of the pressure pipe section 2 and the end face of the wellhead. A sealed drilling channel is established in a non-welding manner to ensure that the drilling fluid will not overflow during drilling.

[0035] The above structure is lowered into the wellbore of the drilling platform, and the outer sleeve is wrapped around the original water-resistant pipe to form a seal, which meets the requirements for establishing drilling channels with a diameter range of 508-914mm. The tight connection design of the casing section 1 and the pressure pipe section 2 makes the installation process simpler and faster. The casing section 1 is pressed down and arranged on the outside of the reserved wellhead 5, and the pressure pipe section 2 is in contact with the wellhead end face. The first sealing structure 11 is located between the inner wall of the casing section 1 and the outer wall of the wellhead, and the second sealing structure 20 is located between the end of the pressure pipe section 2 and the wellhead end face. This double sealing design ensures the high sealing of the drilling channel and effectively prevents the overflow of drilling fluid. The use of non-welding methods to establish the drilling channel avoids sparks that may be generated during the welding process, thereby reducing safety hazards such as flash explosions. The use of non-welding connection methods makes the maintenance and overhaul process simpler, reducing maintenance costs and time. It improves the efficiency and safety of drilling operations on offshore oil and gas platforms and provides strong technical support for offshore oil and gas production.

[0036] As a preferred embodiment of the present application, the first sealing structure 11 is an O-ring, which is arranged in multiple layers on the inner wall of the casing section 1. The arrangement of multiple O-rings is equivalent to forming a multi-layer sealing barrier between the inner wall of the casing section 1 and the outer wall of the wellhead. Each layer of O-rings can provide a certain sealing pressure, and stacking multiple layers can significantly enhance the overall sealing performance. Due to the presence of multiple O-rings, when one layer is worn, the other layers can still continue to provide a sealing effect. This wear-distributing property extends the service life of the overall sealing structure.

[0037] Furthermore, a sealing groove 10 is provided on the inner wall of the casing section 1 . The sealing groove 10 is a 24° single-sided dovetail groove, and an O-ring is provided in the sealing groove 10 .

[0038] The 24° single-sided dovetail groove design effectively locks the O-ring in place after installation. This groove design utilizes the groove's tilted angle, preventing the O-ring from being pulled outwards due to resistance from the groove walls. During drilling operations, the wellhead may be subject to complex forces from various directions. The dovetail groove design ensures that the O-ring remains securely in place under these complex conditions, preventing it from dislodging.

[0039] As a preferred embodiment of this application, see Figure 2 The second sealing structure 20 is a cone sealing device arranged on the end face of the pressure pipe section 2. The center of the cone sealing device is connected to the interior of the pressure pipe section 2. The cone sealing device can be inserted into the reserved wellhead 5 to form an inner end face seal. Specifically, one end of the pressure pipe section 2 is connected to the inner wall of the casing section 1, and a gap is formed between the cone sealing device and the inner wall of the casing section 1 for the end of the reserved wellhead 5 to be inserted.

[0040] The cone seal is designed to fit snugly against the inner wall of the reserved wellhead 5, forming an effective inner end-face seal. The center of the cone seal communicates with the interior of the pressure pipe section 2, ensuring that drilling fluid or other media can flow smoothly through the pressure pipe section 2 into the reserved wellhead 5. This design avoids fluid channel blockage or flow reduction caused by the sealing structure. Made of high-strength, wear-resistant, and corrosion-resistant materials, the cone seal can withstand the high-pressure environments encountered during drilling operations, ensuring the stability and reliability of the seal structure under these conditions.

[0041] As a preferred embodiment of the present application, a pipe hanging section 4 is provided on the upper part of the pipe pressing section 2. The pipe hanging section 4 is provided with a lifting structure. The lifting structure includes a lifting hole 40 at the top and a lifting ear 41 on the lower side of the lifting hole 40 to facilitate the lifting of the entire connecting conduit.

[0042] During installation, the hoisting structure allows the entire connecting conduit assembly to be easily lifted and moved using a hoisting device. This greatly simplifies the installation process and reduces the difficulty of manual handling and positioning. The hoisting structure allows the connecting conduit to be accurately inserted into the reserved wellhead 5 without requiring excessive manual adjustment or correction. This not only improves installation efficiency but also reduces potential risks associated with improper installation.

[0043] See also Figure 1 The diameter of the hanging pipe section 4 is larger than that of the pressing pipe section 2, and a conical transition section 3 is provided between the two. The hanging pipe section 4 is detachably connected to the rising pipe, which is not shown in the figure. The end of the rising pipe is a hydraulic locking joint, and the rising pipe and the connecting conduit are tightly connected and sealed using the existing one-circle hydraulic locking method. Specifically, two lifting holes 40 are opened at the top of the hanging pipe section 4. Two lifting ears 41 are welded 1.5 meters below the top of the pipe, which can be used as spare lifting points. The clamping height of the rising pipe and the device is adjustable, and the bottom can be swallowed by the lifting ear 41 of the device, with an adjustable height of 1.5 meters. The convenience of raising the height of the drilling platform is increased, which is convenient for measuring the drilling footage. When the outer shell insertion resistance is too large, the rising pipe can be directly seated on the lifting ear 41, relying on the increase of its own weight to make the insertion smooth. The end of the rising pipe will eventually reach the drilling platform to connect other equipment.

[0044] As a preferred embodiment of the present application, the length l 1 of the casing section 1 satisfies the following: 1 meter ≤ l 1 ≤ 1.5 meters.

[0045] As a preferred embodiment of the present application, the internal dimension of the connecting conduit is greater than 18 inches, meeting the through-drilling requirements of a 17.5-inch drill bit.

[0046] Anything not described in this utility model can be achieved by adopting or drawing on existing technologies.

[0047] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and such variations or substitutions are intended to fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A special connecting conduit device for a drilling platform, characterized in that: The connecting conduit comprises a tightly connected casing section and a pressing pipe section. The diameter of the casing section is larger than that of the pressing pipe section. A first sealing structure is provided in the casing section, and a second sealing structure is provided at the end of the pressing pipe section. The casing section is pressed down and arranged on the outside of the reserved wellhead. The pressing pipe section can contact the end face of the wellhead. The first sealing structure can achieve sealing between the inner wall of the casing section and the outer wall of the wellhead. The second sealing structure can achieve sealing between the end face of the pressing pipe section and the end face of the wellhead. A sealed drilling channel is established in a non-welding manner to ensure that the drilling fluid will not overflow during drilling.

2. The special connecting conduit device for a drilling platform according to claim 1, characterized in that: The first sealing structure is an O-shaped sealing ring, and the O-shaped sealing ring is arranged in multiple layers on the inner wall of the casing section.

3. The special connection conduit device for a drilling platform according to claim 2, characterized in that: A sealing groove is provided on the inner wall of the sleeve section. The sealing groove is a 24° single-sided dovetail groove, and an O-shaped sealing ring is provided in the sealing groove.

4. The special connection conduit device for a drilling platform according to claim 1, characterized in that: The second sealing structure is a cone sealing device arranged on the end face of the pressure pipe section. The center of the cone sealing device is connected to the inside of the pressure pipe section. The cone sealing device can be inserted into the reserved wellhead to form an inner end face seal.

5. The special connecting conduit device for a drilling platform according to claim 4, characterized in that: One end of the compression pipe section is connected to the inner wall of the casing section, and a gap is formed between the cone sealing device and the inner wall of the casing section for the reserved wellhead end to be inserted.

6. The special connection conduit device for a drilling platform according to claim 1, characterized in that: A pipe hanging section is provided on the upper part of the pipe pressing section. The pipe hanging section is provided with a hanging structure. The hanging structure includes a hanging hole on the top and a hanging ear on the lower side of the hanging hole, so as to facilitate the hanging of the entire connecting conduit.

7. The special connection conduit device for a drilling platform according to claim 1, characterized in that: The diameter of the pipe hanging section is larger than that of the pipe pressing section, and a tapered transition section is provided between the two.

8. The special connection conduit device for a drilling platform according to claim 1, characterized in that: The hanging pipe section can be detachably connected to the rising pipe. The end of the rising pipe is a hydraulic locking joint. The two are hydraulically locked to form a seal.

9. The special connection conduit device for a drilling platform according to claim 1, characterized in that: The length of the casing section l 1 satisfies the following conditions: 1 meter ≤ l 1 ≤ 1.5 meters.

10. The special connection conduit device for a drilling platform according to claim 1, characterized in that: The internal diameter of the connecting conduit is greater than 18 inches, meeting the drilling requirements of a 17.5-inch drill bit.

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