Marine riser replacement pup joint device
By designing a water pipe replacement short section device including a short section body of the submersible pipe, a straightened outer cylinder and a pile cap guide ring, the problems of easy deflection of the water pipe, high penetration ratio and high risk of hammer rejection in the small-sized water pipe pile driving operation are solved, and a deeper mud inflow depth and lower risk of hammer rejection are achieved, ensuring the smooth progress of drilling operations.
Patent Information
- Application Number
- CN202510502925.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2025-06-13
AI Technical Summary
In offshore drilling platforms, small-sized water-submerged pipe pile driving operations are prone to problems such as water-submerged pipes being easily deflected, high penetration ratio, high risk of hammer rejection, and inadequate ruler, which affects subsequent drilling operations.
A water-retaining pipe replacement short section device is designed, including a water-retaining short section body, a straightening outer cylinder and a pile cap guide ring. Through the mutual cooperation of these components, the water-retaining pipe, a water-retaining short section and a pile hammer are improved to ensure effective energy transmission and prevent the water-retaining pipe from deflecting.
It effectively reduces the penetration ratio of small-sized water-submerged pipe pile driving operations, increases the mud depth, reduces the risk of hammer rejection, ensures the smooth progress of small-submerged pipe pile driving operations, and saves the cost of pile driving operations.
Smart Images
Figure CN120139207A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of drilling engineering, and in particular to a riser substitute joint device. Background Art
[0002] At present, the method of lowering the riser of an offshore oil drilling platform mainly adopts the operation form of pile driving with a pile hammer. The pile driving operation mainly relies on two devices: a hydraulic pile hammer and a substitute joint. Among them, the hydraulic pile hammer mainly controls the energy generated by the compression of hydraulic oil to push the internal core pile hammer device to move upward to release huge hammering energy. However, if this energy acts directly on the riser, it will cause the riser to deform and be damaged. Therefore, a substitute joint is installed between the pile hammer and the riser to transfer the energy, so as to realize the lowering of the riser in the formation while protecting the riser from damage.
[0003] However, for small-sized risers with a diameter less than 20 inches, the problem of insufficient penetration has always been a difficult problem encountered in the pile driving operation. Different from the pile driving operation of large-sized risers, when using a conventional pile hammer and a substitute joint for the pile driving operation of small-sized risers, it is more affected by the soil plug effect, and the resistance it receives is also greater. Moreover, during the pile driving operation of small-sized risers, it is easy to deflect, making the pile hammer energy unable to be concentrated and transferred to the riser, resulting in problems such as high penetration ratio and high risk of hammer refusal in the pile driving operation of small-sized risers, which will have an important impact on the subsequent drilling operation.
[0004] At present, for problems such as easy deflection of the riser, high penetration ratio, high risk of hammer refusal, and insufficient penetration affecting the subsequent surface drilling operation in the pile driving operation of small-sized risers, generally, the pile hammer is optimized in design, but it can only achieve the purpose of increasing the hammering energy. Also, because the strength of small-sized risers is weaker than that of large-sized risers, increasing the hitting energy cannot fully meet its penetration requirements. And the failure to reach the design penetration requirements will increase risks such as well leakage risk and wellhead subsidence. Moreover, hammering the riser with too much energy will increase the risk of piercing the riser in the formation, and the pile hammer with greater hammering energy will also require more cost, which is not very suitable for the actual pile driving operation of small-sized risers.
[0005] Therefore, there is an urgent need for a riser substitute joint device to solve the above technical problems such as easy deflection of the riser, high penetration ratio, and high risk of hammer refusal in the pile driving operation of small-sized risers. Summary of the Invention
[0006] The object of the present invention is to provide a riser sub replacement joint device, which can improve the centering degree of the riser, the sub replacement joint and the pile hammer, improve the centering degree of the pile hammer hitting, prevent the riser from deflecting, effectively reduce the risk of hammer refusal in the piling operation of small-diameter risers, reduce the penetration ratio in the piling operation of small-diameter risers, meet the mud penetration depth requirements in the piling operation of small-diameter risers, and ensure the smooth progress of the piling operation of small-diameter risers. The preferred technical solutions among the many technical solutions provided by the present invention and the many technical effects that can be produced are described in detail below.
[0007] To achieve the above object, the present invention provides the following technical solutions:
[0008] A riser sub replacement joint device provided by the present invention includes a sub replacement joint body, a centralizing outer cylinder and a pile cap guiding ring. The centralizing outer cylinder is sleeved outside the sub replacement joint body, and the first end of the centralizing outer cylinder is connected to the sub replacement joint. A gap for accommodating the riser is provided between the inner wall of the centralizing outer cylinder and the sub replacement joint body; an opening for the riser to enter and exit the gap is provided at the second end of the centralizing outer cylinder; the pile cap guiding ring is arranged at the upper end of the sub replacement joint body.
[0009] Preferably, the centralizing outer cylinder is arranged in the upper middle part of the sub replacement joint body, and the central axis of the centralizing outer cylinder coincides with the central axis of the sub replacement joint body.
[0010] Preferably, the gap is equal to the wall thickness of the riser.
[0011] Preferably, the edge of the second end of the centralizing outer cylinder is provided with a smooth curved surface inclined towards the inside of the centralizing outer cylinder.
[0012] Preferably, the edge of the first end of the centralizing outer cylinder is provided with a chamfer, and the chamfer can be in contact with the pile cap.
[0013] Preferably, the upper end of the pile cap guiding ring is provided with an inclined surface.
[0014] Preferably, the longitudinal section of the pile cap guiding ring is a trapezoidal structure.
[0015] Preferably, the included angle between the inclined surface and the central axis of the sub replacement joint body is 30° - 60°.
[0016] Preferably, the included angle between the inclined surface and the central axis of the sub replacement joint body is 45°.
[0017] A riser substitute joint device provided by the present invention, by arranging a substitute joint body and arranging a centralizing outer cylinder and a pile cap guiding ring on the outer side of the substitute joint body, through the mutual cooperation of the substitute joint body, the centralizing outer cylinder and the pile cap guiding ring, the centering degree and energy utilization degree of the riser, the substitute joint body and the pile hammer can be improved, effectively solving the problem that the riser is prone to deflection in the piling operation of small-sized risers, and reducing the penetration ratio of the piling operation of small-sized risers below 20 inches, increasing the penetration depth of the piling operation of small-sized risers, effectively reducing the risk of hammer refusal in the piling operation of small-sized risers, saving the piling operation cost, and ensuring the smooth progress of the piling operation of small-sized risers on the existing offshore drilling platform. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0019] Figure 1 It is a schematic structural diagram of an embodiment of the riser substitute joint device of the present invention.
[0020] In the figure: 1. Substitute joint body; 2. Centralizing outer cylinder; 21. First end; 22. Second end; 201. Inner wall; 202. Chamfer; 203. Smooth surface; 3. Pile cap guiding ring; 301. Inclined surface; 10. Gap. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.
[0022] In the description of the present invention, it should be understood that the terms "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.
[0023] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0024] Good pile driving operations can greatly optimize the design of the drilling wellbore structure, improve the safety and efficiency of drilling operations, and reduce operating costs. However, during the pile driving operation of small-diameter risers below 20 inches, problems such as easy deflection of the riser, high penetration ratio, and high risk of hammer refusal often occur, making it difficult to meet the design requirements for the depth of the riser into the mud.
[0025] In response to this, this embodiment provides a riser sub for pile driving, Figure 1 which is a schematic structural diagram of this embodiment. As Figure 1 shown, the device includes a sub for pile driving body 1, a centralizing outer cylinder 2, and a pile cap guide ring 3.
[0026] Among them, the centralizing outer cylinder 2 is sleeved outside the sub for pile driving body 1. Specifically, in this embodiment, the centralizing outer cylinder 2 is installed in the upper-middle part of the sub for pile driving body 1, and the central axis of the centralizing outer cylinder 2 coincides with the central axis of the sub for pile driving body 1, for centralizing the riser and improving the concentricity between the riser and the sub for pile driving body 1.
[0027] Specifically, as Figure 1 shown, the first end 21 of the centralizing outer cylinder 2 in this embodiment is connected to the sub for pile driving body 1. By setting the end of the centralizing outer cylinder 2 to be fixedly connected to the upper-middle part of the sub for pile driving body 1, problems such as device damage caused during the pile driving operation can be prevented.
[0028] In this embodiment, a gap 10 for accommodating the riser is provided between the inner wall 201 of the centralizing outer cylinder 2 and the sub for pile driving body 1, and an opening for the riser to enter and exit the gap 10 is provided at the second end 22 of the centralizing outer cylinder 2.
[0029] In this embodiment, the gap 10 is equal to the wall thickness of the riser. It can be understood that during the actual production and construction process, the inner diameter, wall thickness, etc. of the centralizing outer cylinder 2 can be designed and selected according to parameters such as the wall thickness of the riser to be centralized in actual needs.
[0030] To improve the centering degree of the sub joint body 1 of the sub, in this embodiment, a pile cap guiding ring 3 is provided at the upper end of the sub joint body 1. The pile cap guiding ring 3 can guide the sub joint body 1 to form a good fit with the pile cap, improve the centering degree of the sub joint body 1 and the pile hammer, make the centering degree of the overall structure high, and further enable the hammering energy of the pile hammer to be better concentrated on the sub joint body 1.
[0031] For this riser sub device, by providing the sub joint body 1 and arranging a centralizing outer cylinder 2 and a pile cap guiding ring 3 on the outer side of the sub joint body 1, and by the mutual cooperation of the sub joint body 1, the centralizing outer cylinder 2 and the pile cap guiding ring 3, it can improve the centering degree and energy utilization degree of the riser, the sub joint body 1 and the pile hammer, effectively solve the problem of easy deflection of the riser in the piling operation of small-diameter risers, and reduce the penetration ratio of the piling operation of small-diameter risers below 20 inches, increase the penetration depth of the piling operation of small-diameter risers, effectively reduce the risk of hammer refusal in the piling operation of small-diameter risers, save the piling operation cost, and ensure the smooth progress of the piling operation of small-diameter risers on the existing offshore drilling platform.
[0032] As an optional implementation manner, a smooth curved surface 203 inclined towards the inner side of the centralizing outer cylinder 2 is provided at the edge of the second end 22 of the centralizing outer cylinder 2.
[0033] During use, by providing a smooth curved surface at the inner edge of the tail of the centralizing outer cylinder 2, the riser can be more smoothly guided into the specified position between the centralizing outer cylinder 2 and the sub joint body 1.
[0034] During the actual production and use process, the spatial length of the gap 10 between the centralizing outer cylinder 2 and the sub joint body 1 can be designed according to the actual sizes of the riser and the sub joint body 1 to facilitate the smooth entry of the riser.
[0035] As an optional implementation manner, a chamfer 202 is provided at the edge of the first end 21 of the centralizing outer cylinder 2, and the chamfer 202 can abut against the pile cap.
[0036] By providing a chamfer 202 at the shoulder of the centralizing outer cylinder 2, during use, the chamfer 202 can fit with the pile cap to ensure more safety and reliability during use.
[0037] As an optional implementation manner, an inclined surface 301 is provided at the upper end of the pile cap guiding ring 3. In this embodiment, the upper end of the pile cap guiding ring 3 is provided with an inclined surface 301 and chamfering treatment, which can improve the good fit between the pile cap guiding ring 3 and the pile cap to improve the overall centering degree.
[0038] Specifically, the included angle R between the inclined plane 301 and the central axis of the sub driving joint body 1 in this embodiment is 30° - 60°. Preferably, in this embodiment, the included angle between the inclined plane 301 and the central axis of the sub driving joint body 1 is set to 45°.
[0039] As Figure 1 shown, the longitudinal section of the pile cap guide ring 3 in this embodiment is a trapezoidal structure. On the premise of ensuring that the sub driving joint body 1 can be smoothly guided to the pile hammer and improving the centering degree between the sub driving joint body 1 and the pile hammer, the stability is stronger, so as to improve the energy concentration degree of the pile hammer impact energy transferred to the sub driving joint and the riser. And it is applicable to different pile caps, improving the matching degree of the pile driving operation tool, and can be widely used in the pile driving operation of offshore drilling platforms in the oil and gas industry.
[0040] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of them should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A watertight pipe replacement short joint device, characterized in that: It includes a replacement short joint body, an outer straightening cylinder and a pile cap guide ring. The outer straightening cylinder is sleeved on the outside of the replacement short joint body, and the first end of the outer straightening cylinder is connected to the replacement short joint. A gap for accommodating a watertight pipe is arranged between the inner wall of the outer straightening cylinder and the replacement short joint body; the second end of the outer straightening cylinder is arranged with an opening for the watertight pipe to enter and exit the gap; the pile cap guide ring is arranged at the upper end of the replacement short joint body.
2. The watertight pipe replacement short joint device according to claim 1 is characterized in that: The outer centralizing cylinder is arranged at the middle and upper part of the sub-sub body, and the central axis of the outer centralizing cylinder coincides with the central axis of the sub-sub body.
3. The watertight pipe replacement short joint device according to claim 2 is characterized in that: The gap is equal to the wall thickness of the watertight pipe.
4. The watertight pipe replacement short joint device according to any one of claims 1 to 3, characterized in that: The edge of the second end of the outer straightening cylinder is provided with a smooth curved surface inclined toward the inner side of the outer straightening cylinder.
5. The watertight pipe replacement short joint device according to claim 4 is characterized in that: The edge of the first end of the outer straightening cylinder is provided with a chamfer, and the chamfer can abut against the pile cap.
6. The watertight pipe replacement short joint device according to any one of claims 1 to 3, characterized in that: An inclined surface is arranged on the upper end of the pile cap guide ring.
7. The watertight pipe replacement short joint device according to claim 6, characterized in that: The longitudinal section of the pile cap guide ring is a trapezoidal structure.
8. The watertight pipe replacement short joint device according to claim 6, characterized in that: The angle between the inclined surface and the central axis of the sub body is 30°-60°.
9. The watertight pipe replacement short joint device according to claim 8, characterized in that: The angle between the inclined surface and the central axis of the sub body is 45°.