Multi-stage thread type alternative short joint capable of repeated cutting

Abstract

This invention provides a reusable, multi-stage threaded replacement sub, belonging to the field of drilling engineering technology. It includes a sub body with a straight cylindrical structure. One end of the sub body has a connecting part, and the other end is a hammer face. A cutting area is provided at the end of the sub body near the hammer face. The lower end face of this invention is connected and fixed to the riser pipe via a threaded male end face, which can prevent the replacement sub from bouncing and slipping during high-energy piling. Furthermore, when the upper end face deforms during piling, the deformed threaded replacement sub can be cut and ground along the indicator line in the upper cutting area for reuse, avoiding repeated replacement of the replacement sub. This facilitates rapid standard reuse on the construction site, reduces maintenance time, effectively ensures smooth piling operations, and lowers piling costs.

Description

Technical Field

[0001] This utility model relates to the field of drilling engineering technology, and in particular to a multi-stage threaded replacement sub that can be repeatedly cut and used. Background Technology

[0002] Riser pile driving is a crucial step in offshore oil development. The main equipment for pile driving includes a pile hammer, a replacement short section, and a buffer pad. The pile hammer primarily provides the hammering energy, while the replacement short section transmits this energy and protects the riser from damage. The use of the replacement short section effectively ensures the quality and safety of the pile hammer and protects the riser from loss, playing a vital role in the pile driving process.

[0003] Currently, the replacement short sections used in offshore oil drilling piling operations are mainly insert-type replacement short sections, which have two end faces. The lower end face of the replacement short section fits into the riser, and the upper end face fits into the pile hammer. The existing replacement short section's lower end snap type is usually a stepped snap type, and each stepped surface has a different angle. The existing replacement short section's upper end face is usually shaped like a frustum to fit into the pile hammer. The complex end face structure makes the manufacturing process of the existing replacement short section complicated, and its upper and lower end faces are prone to deformation due to bouncing and deflection during high-energy piling operations. In fact, bouncing can even cause the lower end face of the replacement short section to detach from the riser, resulting in damage to the riser or replacement short section when piling continues. The existing technology for repairing replacement short sections mainly involves removing the damaged surface. For example, if there is a protrusion or depression in a certain place on the lower end face, it is smoothed with a grinder. However, this kind of repair makes it difficult to maintain the fit between the upper and lower end faces and the riser and the pile hammer, respectively. Because the existing replacement short section has a complex structure, if its lower or upper end face is severely damaged by impact, cutting off the damaged portion will prevent the replacement short section from effectively fitting with the existing riser pipe. Therefore, damaged replacement short sections can only be replaced and cannot be reused. Once a replacement short section is damaged, it can only be replaced on-site. Replacing it with a new replacement short section is not only time-consuming and labor-intensive, increasing the risk of hammer failure and affecting the efficiency of piling operations, but also creates significant difficulties for subsequent piling operations on-site. In addition, replacing it with a new replacement short section increases the cost of piling operations.

[0004] Therefore, designing and manufacturing a replacement short section that is simple to process, low in cost, and reusable is of great significance for solving problems such as easy damage to replacement short sections, time-consuming replacement of spare replacement short sections, and high cost of piling operations. Utility Model Content

[0005] In view of this, the present invention aims to propose a multi-stage threaded replacement short section that can be repeatedly cut and used, which can solve the problems that the upper and lower end faces of the replacement short section body are easily deformed by hammering during the piling operation, the poor quality after repairing the end face leads to low piling efficiency, increased risk of hammer refusal, and affected piling operation efficiency, thus avoiding high piling operation costs.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a multi-stage threaded replacement short section that can be repeatedly cut and used includes a short section body, the short section body has a straight cylindrical structure, one end of the short section body is provided with a connecting part, the other end is a hammering end face, and the end of the short section body near the hammering end face is provided with a cutting area.

[0007] Furthermore, the connecting part has a threaded male thread structure.

[0008] Furthermore, the cross-sectional diameter of the end of the connecting part that connects to the short section body is equal to the diameter of the short section body, while the cross-sectional diameter of the connecting part gradually decreases from the end connected to the short section body to the end away from the short section body.

[0009] Furthermore, the cutting area is marked with multiple equally spaced indicator lines.

[0010] Furthermore, the indicator line is set around the outer wall of the short section body and at equal distances from the hammering end face.

[0011] Furthermore, the cutting area can be cut along the indicator line, and the cut short section body has a new hammered end face formed at the position where it was cut along the indicator line.

[0012] Furthermore, the length of the short section body is 1.5 to 3 times the length of the cutting zone.

[0013] Compared with the prior art, the multi-stage threaded replacement short section that can be repeatedly cut and used according to this utility model has the following advantages: The lower end face of the replacement short section of this utility model is provided with a threaded connecting part, and the upper part of the short section body is provided with a cutting area, and multiple indicator lines are provided in the cutting area. It can be quickly cut and repaired after the upper end face of the threaded replacement short section body is damaged. It can effectively solve the problems of easy damage to replacement short sections during piling operations, time-consuming replacement of spare replacement short sections and increased risk of hammer failure, and high cost of piling operations.

[0014] (1) The structure is simple and can be reused by quick cutting and repair, without the need to replace the spare replacement short section, thus saving the cost of the spare replacement short section;

[0015] (2) The lower end face of the replacement short section is provided with a connecting part. The connecting part is a threaded male thread structure, which can prevent the lower end face from slipping and deforming due to bouncing during high-energy piling, and effectively protect the lower end face from damage.

[0016] (3) This utility model is provided with a cutting area, and multiple indicator lines are provided in the cutting area to facilitate quick and standard cutting after the replacement short section is damaged, thereby increasing the frequency of repeated use.

[0017] (4) The spacing between adjacent indicator lines is 10cm, with reasonable length matching, which facilitates the calculation of length for subsequent pile driving operations and meets the minimum replacement short section length requirement.

[0018] (5) This utility model can be pre-connected to the water-proof pipe on the deck in advance, saving piling operation time. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a multi-stage threaded replacement short section that can be repeatedly cut and used, as described in an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Connecting part; 2. Cutting area; 3. Indicator line; 4. Hammered end face. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] This invention primarily addresses the problems of easily deformed upper and lower surfaces of replacement short sections during piling operations, high costs associated with repeated replacement of short sections, and overall high piling costs. Based on the characteristic that the upper and lower surfaces of replacement short sections are easily damaged and rendered unusable, this invention discloses a multi-stage threaded replacement short section that can be repeatedly cut and reused. In practical applications, the threaded replacement short section can be cut from riser pipes with damaged threads or unqualified lengths. Such riser pipes do not have insufficient strength issues. Therefore, using such riser pipes as raw materials for manufacturing replacement short sections is cost-effective and simple in manufacturing process. Different riser pipes have different diameters, thus allowing for the production of replacement short sections of different sizes. The replacement short section of this invention, by incorporating a threaded male connection part 1 and multi-stage cutting indicator lines 3, facilitates repeated cutting and grinding by on-site welders, ensuring the quality of the replaced short section after repair and facilitating smooth on-site piling operations. Specifically, the main structure of this multi-stage threaded replacement short section is to design the lower end face of the replacement short section as a male thread shape, and to set a cutting area 2 on the upper part of its body. At the same time, the cutting area 2 is divided into multiple small grids by the indicator line 3 on the cutting area 2. The function of the indicator line 3 is to facilitate the cutting of the cutting area 2 when the upper end face of the threaded replacement short section is damaged, so that the replacement short section can be reused. The length of the small grid can be determined by the length of the short section.

[0026] like Figure 1As shown, this utility model is a multi-stage threaded replacement short section that can be repeatedly cut and used. It can be widely used in piling operations on offshore platforms in the oil and gas industry. It includes a short section body with a straight cylindrical structure. One end of the short section body has a connecting part 1, and the other end is a hammering end face 4. A cutting area 2 is provided at the end of the short section body near the hammering end face 4. In practical application, the end of the replacement short section with the connecting part 1 is positioned downwards. The connecting part 1, as the lower end face of the replacement short section, connects to the riser pipe. The riser pipe is existing technology. Preferably, the connecting part 1 has a male thread structure, i.e., an external thread structure. The connecting part 1 can achieve a threaded connection with the riser pipe through the male thread structure, thereby preventing the upper and lower end faces of the replacement short section from bouncing and slipping during piling, effectively improving the stability and reliability of the connection between the replacement short section and the riser pipe, and effectively protecting the lower end face of the replacement short section from damage. The length of the cutting zone 2 can be determined based on the actual length of the threaded replacement short section, meeting the minimum replacement short section length requirement for piling operations. Preferably, the main body length of the short section is 1.5 to 3 times the length of the cutting zone 2. More preferably, the main body length of the short section is 2 times the length of the cutting zone 2. In practical applications, the main body length of the short section is usually 4m-6m, so the length of the cutting zone can be set to 2m-3m to avoid difficulties in hoisting and fastening the replacement short section when the cutting zone 2 is cut to the last section due to excessive length. In practical applications, the replacement short section of this utility model is available in various models. Different models of replacement short sections have the same structure, but differ in size to adapt to different sizes of riser pipes.

[0027] The cross-sectional diameter of the end of the connecting part 1 that is connected to the short section body is equal to the diameter of the short section body. At the same time, the cross-sectional diameter of the connecting part 1 gradually decreases from the end connected to the short section body to the end away from the short section body. This structure makes it easy to snap the replacement short section and the water-proof pipe together and make the lower end of the replacement short section fit the water-proof pipe better.

[0028] The cutting area 2 is marked with multiple indicator lines 3, preferably evenly spaced. The indicator lines 3 divide the cutting area 2 into multiple small grids. The spacing m between adjacent indicator lines 3 in each small grid is strictly calibrated at the factory, facilitating repeated cutting and grinding by on-site welding and cutting personnel. After damage to the threaded replacement short section, the deformed replacement short section can be quickly and standardly cut along the indicator lines 3 for reuse on-site. Furthermore, the consistent length m of each small grid in the cutting area 2 of the replacement short section facilitates calculation of the depth of the riser pile driven into the mud. The cutting process is simple and low-cost. In practical applications, the length m of each small grid is preferably 10 cm. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0029] The indicator line 3 is set around the outer wall of the short section body and is equidistant from the hammer end face 4. The equidistant setting can increase the fit between the end face and the pile hammer, so that the hammering energy can be evenly transmitted to the water-proof pipe at the lower end face, thus ensuring that the water-proof pipe is always centered in the mud.

[0030] During pile driving, the pile hammer directly strikes the hammer face 4, making it a vulnerable end face. When the hammer face 4 is damaged or deformed, workers can cut it along the indicator line 3 within the cutting area 2. After cutting, a new hammer face 4 is formed at the cut position along the indicator line 3 of the main body of the short section. Based on the design and maintenance process characteristics of the replacement short section, the multi-level threaded replacement short section of this utility model facilitates multiple rapid and standard cuttings of the replacement short section on the construction site by setting multi-level cutting indicator lines 3. Workers ensure the cutting quality of the replacement short section and grind the cut position, enabling repeated use of the existing replacement short section, thereby effectively saving pile driving time and reducing operating costs.

[0031] The purpose of this invention is to solve the problems of easy deformation of the upper and lower ends of the replacement short section body during pile driving operations, low replacement and maintenance efficiency, and high pile driving operation costs. The lower end of the threaded replacement short section described in this invention is connected and fixed to the water-proof pipe through a set threaded male end face, which can prevent the replacement short section from bouncing and causing its lower end face to slip during high-energy pile driving. At the same time, when the upper end face deforms during pile driving, the deformed threaded replacement short section can be quickly cut and ground repeatedly along the indicator line 3 in the upper cutting area 2. This invention avoids the need for repeated replacement of the short section and facilitates rapid standard reuse on the construction site. The short section can be cut multiple times for repeated use, thereby reducing maintenance time. The length of each small grid (m) in the cutting area 2 of the short section body is consistent, which facilitates the calculation of the piling length. This invention can effectively avoid the problems of easy damage to the upper and lower end faces of the short section during piling operations, repeated replacement of the short section, and inefficient maintenance, which lead to high piling operation costs. It effectively ensures the smooth progress of piling operations while reducing piling operation costs.

[0032] In actual operation, the connecting part 1 of the multi-level threaded replacement short section of this utility model is compatible with the female thread of the riser pipe, which allows the replacement short section to be pre-connected to the riser pipe on the deck in advance, saving operation time and reducing piling costs. Then, the riser and replacement short section are hoisted onto the drilling platform together by a crane. The lower part of the riser and replacement short section is then connected to the upper part of another riser. The upper part of this assembly is then lowered into the pile hammer. When the upper end face (i.e., the hammering end face 4) is fully aligned with the large pile hammer and in a centered position, the pile driving operation begins. After the lower riser is driven into the pile, the connection 1 between the upper end of the piled riser and the replacement short section is unfastened. Then, the replacement short section is lifted from the drilling platform by a crane and placed onto the deck. Then, a new riser is reconnected to the connection 1 of the replacement short section, making the riser and replacement short section a single unit. The above steps are repeated, and the newly assembled assembly is lowered into the pile hammer for pile driving. When the upper end face (i.e., hammering end face 4) of the replacement short section is damaged or deformed, the replacement short section is lifted from the drilling platform by a crane and brought to the deck for cutting. After cutting, the replacement short section is connected to the riser and lowered down together with the large pile hammer for pile driving.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage threaded replacement short section that can be repeatedly cut and used, characterized in that: It includes a short section body, which is a straight cylindrical structure. One end of the short section body is provided with a connecting part (1), and the other end is a hammering end face (4). The end of the short section body near the hammering end face (4) is provided with a cutting area (2).

2. The multi-stage threaded replacement short section that can be repeatedly cut and used according to claim 1, characterized in that: The connecting part (1) has a threaded male thread structure.

3. The multi-stage threaded replacement short section that can be repeatedly cut and used according to claim 1, characterized in that: The cross-sectional diameter of the end of the connecting part (1) connected to the short section body is equal to the diameter of the short section body. At the same time, the cross-sectional diameter of the connecting part (1) gradually decreases from the end connected to the short section body to the end away from the short section body.

4. The multi-stage threaded replacement short section that can be repeatedly cut and used according to claim 1, characterized in that: The cutting area (2) is marked with multiple equally spaced indicator lines (3).

5. A reusable, multi-stage threaded replacement short section according to claim 4, characterized in that: The indicator line (3) is set around the outer wall of the short section body and at equal distances from the hammer end face (4).

6. A reusable, multi-stage threaded replacement short section according to claim 4, characterized in that: The cutting area (2) can be cut along the indicator line (3), and the cut short body has a new hammer end face (4) formed at the position where it is cut along the indicator line (3).

7. A reusable, multi-stage threaded replacement short section according to claim 4, characterized in that: The length of the short section is 1.5 to 3 times the length of the cutting area (2).

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