Wellhead Christmas tree aligning device

Abstract

The utility model relates to the technical field of daily maintenance of Christmas trees, in particular to a wellhead Christmas tree aligning device which comprises a fixing main body formed by continuously hinging a plurality of fixing blocks, the fixing blocks are formed by two fixing plates which are correspondingly arranged up and down and then are connected through a plurality of fixing shafts which are vertical in direction, and the fixing main body is buckled into a circle. A centralizing insertion strip pointing to the circle center is arranged on each fixing shaft; clamping mechanisms matched with each other are arranged on the fixing blocks at the two ends of the fixing body. According to the wellhead Christmas tree aligning device provided by the utility model, the plurality of fixing shafts are uniformly arranged on the fixing main body which is buckled into a circle, and the centralizing inserting strips are arranged on the fixing shafts, so that an aligning part can be annularly wrapped and pressure is simultaneously applied from all directions during aligning work, the aligning part of a Christmas tree is uniformly stressed, an oil pipe is prevented from being deformed, and the quality of the oil pipe is improved. The waste of productivity is reduced; meanwhile, the oil pipes at the aligned positions can be pushed to the concentric positions through the righting inserting strips, and it is guaranteed that the oil pipes are concentric after aligned connection.

Description

Technical Field

[0001] The utility model relates to the technical field of daily maintenance of Christmas trees, in particular to a wellhead Christmas tree alignment device. Background Art

[0002] In oilfield operations, Christmas trees are installed at the wellheads of oil and water wells to connect pipelines. Due to the constantly changing production capacity requirements, some Christmas trees need to be replaced according to the production capacity needs. At the same time, after a long time of operation, the Christmas trees will inevitably be corroded by the environment, and the severely corroded Christmas trees also need to be replaced. In actual work, tools such as crowbars and hammers are usually used to adjust the directions and positions of the upper and lower interfaces of the Christmas tree to barely complete the interface work. Sometimes, the interface is tied with steel wires and then pulled by a vehicle to complete the interface work. However, the existing interface connection methods are difficult to ensure that the upper and lower interface parts are concentric at the connection; at the same time, methods such as crowbars, hammers, and vehicle pulling will inevitably cause deformation of the pipe diameter at the connection during the work process, affecting the fluid flow in the pipe, increasing the flow resistance of the liquid, reducing the working efficiency of the oil production system, and causing waste of production capacity. Therefore, in view of the above deficiencies, a wellhead Christmas tree alignment device is proposed. Summary of the Invention

[0003] The purpose of the utility model is to provide a wellhead Christmas tree alignment device to overcome the defects in the prior art that it is impossible to ensure concentricity at the interface when replacing the Christmas tree and that the pipe diameter is easily deformed during the alignment connection work.

[0004] To achieve the above purpose, the utility model provides a wellhead Christmas tree alignment device, including:

[0005] A fixing block, which is composed of two arc-shaped fixing plates with the same shape arranged corresponding to each other up and down. A number of uniformly arranged vertical fixing shafts are provided between the upper and lower fixing plates; after a plurality of the fixing blocks are arranged horizontally, each two adjacent fixing blocks are hinged, and a plurality of fixing blocks are connected to form a fixing body; clamping mechanisms are provided on the fixing blocks at both left and right ends of the fixing body; the fixing body is bent into a circular shape along the hinge of the fixing blocks, and a centering insertion bar pointing towards the center of the circle is provided on each fixing shaft.

[0006] Preferably, a connecting shaft is provided between two adjacent fixing blocks in the fixing body and they are hinged through the connecting shaft.

[0007] Preferably, between two adjacent fixing blocks, a matching stepped structure is provided at the contact of the corresponding fixing plates. The connecting shaft penetrates through the two adjacent fixing blocks from top to bottom at the stepped structure, penetrating a total of four fixing plates in the two adjacent fixing blocks, so as to realize the hinge between the two adjacent fixing blocks.

[0008] Preferably, the number of the fixing bodies is three.

[0009] Preferably, the clamping mechanism includes a clamping rod and a clamping seat, and the clamping rod and the clamping seat are respectively installed on the fixed shafts at the left and right ends of the fixed body; the clamping seat is provided with a clamping groove, and the clamping rod is provided with a clamping handle which is sleeved on the clamping rod; the outer diameters of the left and right ends of the clamping handle are larger than the clamping groove, and the size of the clamping groove matches the diameter of the clamping rod.

[0010] Preferably, the clamping handle is connected to the clamping rod via threads.

[0011] Preferably, an end of the clamping handle away from the clamping rod is provided with a through operating hole.

[0012] Preferably, the fixed shaft and the fixed body are detachably connected.

[0013] Preferably, a plurality of vertically penetrating straightening grooves are provided on the inner side of each of the fixed bodies, a fixed shaft is provided in each of the straightening grooves, and a clamping nut is provided at the upper and lower ends of each of the fixed shafts.

[0014] Preferably, the total number of the straightening cuttings is six.

[0015] The utility model provides a wellhead Christmas tree adapter with the following beneficial effects:

[0016] The wellhead Christmas tree docking device provided by the utility model has a plurality of fixed shafts evenly arranged on a fixed main body buckled into a circle and straightening strips on the fixed shafts. During docking operation, the docking part can be circumferentially wrapped and pressure can be applied from all directions at the same time, so that the docking part of the Christmas tree is evenly stressed, deformation of the oil pipe can be prevented, and waste of production capacity can be reduced. At the same time, the fixed main body buckled at the docking position is gradually clamped by a clamping mechanism, and the oil pipe at the docking position can be pushed to a concentric position by the straightening strip, so as to ensure that the oil pipe position is concentric after docking connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the structural diagram of the wellhead Christmas tree docking device;

[0018] Figure 2 This is the installation diagram of the wellhead Christmas tree docking device.

[0019] Legend:

[0020] 1. Fixing block; 2. Fixing plate; 3. Straightening strip; 4. Fixing shaft; 5. Connecting shaft; 6. Clamping rod; 7. Clamping handle; 8. Clamping seat; 9. Clamping nut. DETAILED DESCRIPTION

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figure 1-2 shown, a wellhead Christmas tree alignment device provided by the present invention includes:

[0023] A plurality of fixing blocks 1, each of the fixing blocks 1 is composed of two arc-shaped fixing plates 2 with the same shape arranged corresponding to each other up and down, and a plurality of vertically arranged fixing shafts 4 are evenly arranged between the upper and lower fixing plates 2; after a plurality of the fixing blocks 1 are arranged horizontally, every two adjacent fixing blocks 1 are hinged to form a fixing body. The fixing body serves as the main body of the device. When replacing and installing the Christmas tree, the fixing body directly contacts the Christmas tree and the pipeline at the installation position, and aligns and fixes the bottom end of the Christmas tree with the pipeline interface at the installation position. The number and size of the fixing blocks 1 can be adjusted according to the actual sizes of the Christmas tree and the pipeline. Generally, the number of the fixing blocks 1 is two or more. Since the fixing block 1 is mainly composed of the fixing plate 2 and the fixing shaft 4 connecting the fixing plates, the cross-section of the fixing block 1 is an arc shape the same as that of the fixing plate 2. When a plurality of fixing blocks 1 are arranged horizontally and hinged to form a fixing body, the fixing body can be bent into a circular shape along the hinge joints between the fixing blocks 1. The fixing shaft 4 connects the two fixing plates 2 to form the fixing block 1, and the fixing shaft 4 plays a supporting role for the fixing plate 2. The fixing body is bent into a circular shape along the hinge joints of the fixing blocks 1, and a centering insertion strip 3 with a direction pointing to the center of the circle is arranged on each fixing shaft 4. By arranging the centering insertion strip 3 on the fixing shaft, when the fixing body circumferentially wraps the Christmas tree and the pipeline at the installation position, the centering insertion strip 3 will contact the Christmas tree and the pipeline at the installation position as the fixing body gradually buckles into a ring shape. As the fixing body gradually buckles and clamps, the centering insertion strip 3 will push the Christmas tree and the pipeline at the installation position until the fixing body is completely closed. At this time, the ends of the centering insertion strip 3 enclose a cylindrical space inside the fixing body, and both the Christmas tree and the pipeline are located in this cylindrical space. During operation, by installing centering insertion strips 3 with different lengths, the diameter of the cylinder formed by the centering insertion strips 3 when the fixing body is buckled and clamped can be adjusted. After selecting a centering insertion strip 3 with a suitable size before installing and replacing the Christmas tree so that the diameter of the cylinder formed by it matches the Christmas tree and the pipeline at the installation position, the Christmas tree and the pipeline at the installation position can be pushed and fixed to the concentric position.

[0024] Among them, during the process of the centering insert 3 pushing the Christmas tree and the pipeline to the straight concentric position, each centering insert 3 will contact the pipeline and the Christmas tree and apply a thrust force to them, so as to apply thrust forces to the Christmas tree and the pipeline simultaneously from multiple directions, making the Christmas tree and the pipeline evenly stressed, preventing pipeline deformation caused by uneven stress, and avoiding productivity waste and production efficiency reduction caused by pipeline deformation. When the centering insert 3 pushes the Christmas tree and the pipeline to the concentric position to achieve centering and fixation, the welding equipment can be directly inserted into the gap between the centering inserts 3 to weld the interface of the Christmas tree and the pipeline. After welding, the fixing main body can be removed and recycled to complete the alignment and connection work of the Christmas tree replacement and installation.

[0025] It should be noted that a connecting shaft 5 is provided between two adjacent fixing blocks 1 in the fixing main body and they are hinged through the connecting shaft 5. Between two adjacent fixing blocks 1, at the contact of the corresponding fixing plates 2, there are matching stepped structures. The connecting shaft 5 passes through a total of four fixing plates 2 in the two adjacent fixing blocks 1 from top to bottom at the stepped structure to achieve hinging. After hinging, the fixing blocks 1 can rotate freely around the connecting shaft 5.

[0026] In addition, the total number of the centering inserts 3 is generally six. Generally, for the installation work of most models of Christmas trees, the six centering inserts 3 can all meet the function of balancing the stress of the Christmas tree and the pipeline, and at the same time can also leave sufficient working space for the subsequent welding work. In actual work, according to the model and its own strength of the Christmas tree, the number of centering inserts and the corresponding fixing shafts 4 can be adjusted.

[0027] In order to improve work efficiency and usability, the fixing shaft 4 and the fixing block 1 are detachably connected. During the work process, when it is necessary to replace the centering insert 3, only the corresponding fixing shaft 4 needs to be removed and then replaced with a fixing shaft 4 with a suitable size for the centering insert 3, without the need to replace the whole device.

[0028] Among them, several vertically penetrating centering grooves are provided inside each fixing block 1, and a fixing shaft 4 is provided in each centering groove. Clamping nuts 9 are respectively provided at the upper and lower ends of each fixing shaft 4. Threaded columns with diameters smaller than the fixing shaft 4 are provided at both ends of the fixing shaft 4. The size of the centering groove matches that of the threaded column. When installing the fixing shaft 4, the fixing shaft 4 is placed into the centering groove from the inside of the fixing block 1. At this time, the threaded columns at both ends of the fixing shaft 4 fall into the centering groove, and then the clamping nuts 9 are installed at both ends of the fixing shaft 4 and tightened. At this time, the clamping nuts 9 cooperate with the fixing shaft 4 to clamp the fixing plate 2, thereby realizing the installation of the fixing shaft 4. When it is necessary to replace the fixing shaft 4, only the clamping nuts 9 need to be unscrewed, then the fixing shaft 4 is replaced, and then the clamping nuts 9 are tightened. The replacement process is simple to operate and has good stability.

[0029] In the present utility model, clamping mechanisms are provided on the fixing blocks 1 at the left and right ends of the fixing main body. During the process of gradually fastening the fixing main body, the clamping mechanisms can apply forces to the fixing blocks 1 at the left and right ends of the fixing main body to make the two gradually approach, thereby driving the fixing main body to be gradually clamped and improving the working efficiency of the device.

[0030] Among them, the clamping mechanism includes a clamping rod 6 and a clamping seat 8. The clamping rod 6 and the clamping seat 8 are respectively installed on the fixing shafts 4 at the left and right ends of the fixing main body; a clamping groove is provided on the clamping seat 8, and a clamping handle 7 sleeved on the clamping rod 6 is provided on the clamping rod 6; the outer diameters of the left and right ends of the clamping handle 7 are larger than the clamping groove, and the size of the clamping groove is matched with the diameter of the clamping rod 6. During the process of fastening the fixing main body, after the clamping rod 6 is inserted into the clamping groove, the clamping handle 7 is installed at the outer end of the clamping rod 6. At this time, a force is applied to the clamping handle 7 to push the clamping handle 7 towards the clamping rod 6. Since the diameters of both ends of the clamping handle 7 are larger than the clamping groove, the bottom end of the clamping handle 7 will contact the clamping seat 8 at this time and push the clamping seat 8 towards the clamping rod 6 as the clamping handle 7 moves. At this time, the clamping seat 8 will drive the corresponding fixing block 1 to move towards the clamping rod 6, thereby realizing the gradual clamping work of the fixing main body.

[0031] Generally, the clamping handle 7 is threadedly connected to the clamping rod 6. When operating the clamping handle 7 to move towards the clamping rod 6, only the clamping handle 7 needs to be rotated, and under the action of the thread, the clamping seat 8 can be gradually pushed towards the clamping rod 6 through the clamping handle 7. At this time, the pulling force generated by rotating the clamping handle 7 through the thread acts on the clamping handle 7, the clamping seat 8 and the clamping rod 6 at the same time, thereby simultaneously pulling the fixing blocks 1 at both ends of the fixing main body to move towards the middle and fasten.

[0032] It should be noted that a through operating hole is provided at one end of the clamping handle 7 away from the clamping rod 6. When rotating the clamping handle 7, tools such as a crowbar and a steel pipe are used as operating rods and inserted into the operating hole, and the operating rod can be rotated to operate the clamping handle 7 to rotate, thereby driving the fixing main body to be clamped through the thread. In this process, the operating rod forms a lever structure in the operating hole, greatly saving the magnitude of the force required when rotating the clamping handle 7, reducing the operation difficulty of the device and reducing the workload of the device. In actual work, by extending the length of the operating rod, the lever structure can be further utilized to reduce the magnitude of the force required for operation, thereby further improving the working efficiency of the device.

[0033] In the present invention, the number of the fixing blocks 1 is generally three. When the number of the fixing blocks 1 is three, during the process of clamping and fixing the main body, the fixing blocks 1 at both ends will respectively form a lever structure with the fixing block 1 in the middle with the connection point between the two fixing blocks 1 as the fulcrum. In these two lever structures, the moment of the force exerted on the fixing block 1 by the Christmas tree and the pipeline through the alignment insert 3 is smaller than the moment of the force exerted on the fixing block 1 by the clamping mechanism. At this time, the working efficiency in the process of pushing the Christmas tree and the pipeline to be concentric by buckling and fixing the main body can be further improved, realizing efficient work. At the same time, through repeated practices, when the number of the fixing blocks 1 is three, only one staff member is required to operate, and the centering operation time of the Christmas tree and the pipeline can be shortened by 35 minutes, saving both working hours and manpower.

[0034] Combined with Figure 1-2 , the following specifically describes the steps when this wellhead Christmas tree aligner works:

[0035] Step 1: Select a suitable alignment insert according to the sizes of the Christmas tree and the pipeline to be centered and connected, and determine the number of the fixing blocks and the fixing shafts.

[0036] Step 2: Install the device structure for connection according to the sizes and numbers of the components selected in Step 1.

[0037] Step 3: Buckle the main body on the connection of the Christmas tree and the pipeline, insert the clamping rod into the clamping seat, and rotate the clamping handle. In this process, use tools such as crowbars and wrenches commonly used at the work site as the operating rod and insert it into the operation hole, and rotate the operating rod to drive the clamping handle to rotate. Under the action of the thread, the clamping handle gradually pushes the clamping seat towards the side of the clamping handle, thereby gradually pulling and buckling the fixing blocks at both ends of the main body. At this time, the alignment insert gradually contacts the Christmas tree and the pipeline and pushes the Christmas tree and the pipeline towards the middle of the main body until the Christmas tree and the pipeline are centered when the main body is completely closed.

[0038] Step 4: Extend the welding tool into the main body through the gap between the alignment inserts to weld the Christmas tree and the pipeline.

[0039] Step 5: After the welding work is completed, disassemble and recycle the device.

[0040] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A wellhead Christmas tree docking device, characterized in that: include: A plurality of fixing blocks (1), wherein the fixing blocks (1) are composed of two arc-shaped fixing plates (2) of the same shape arranged in correspondence with each other up and down, and a plurality of evenly spaced vertical fixing shafts (4) are provided between the upper and lower fixing plates (2); after the plurality of fixing blocks (1) are arranged in a horizontal direction, after every two adjacent fixing blocks (1) are hinged, the plurality of fixing blocks (1) are connected to form a fixing body; clamping mechanisms are provided on the fixing blocks (1) at the left and right ends of the fixing body; the fixing body is bent into a circle along the hinge of the fixing blocks (1), and each fixing shaft (4) is provided with a straightening insert (3) pointing to the center of the circle.

2. The wellhead Christmas tree adapter according to claim 1, characterized in that: A connecting shaft (5) is provided between two adjacent fixing blocks (1) in the fixing body and the fixing blocks are hingedly connected via the connecting shaft (5).

3. The wellhead Christmas tree adapter according to claim 2, characterized in that: Between two adjacent fixed blocks (1), the fixed plates (2) at corresponding positions are provided with matching step structures, and the connecting shaft (5) penetrates the two adjacent fixed blocks (1) from top to bottom at the step structure, penetrating a total of four fixed plates in the two adjacent fixed blocks (1), so as to realize the hinge connection between the two adjacent fixed blocks (1).

4. The wellhead Christmas tree adapter according to claim 1, characterized in that: The number of the fixing blocks (1) is three.

5. The wellhead Christmas tree adapter according to claim 1 or 4, characterized in that: The clamping mechanism comprises a clamping rod (6) and a clamping seat (8), wherein the clamping rod (6) and the clamping seat (8) are respectively mounted on the fixed shaft (4) at the left and right ends of the fixed body; the clamping seat (8) is provided with a clamping groove, and the clamping rod (6) is provided with a clamping handle (7) sleeved on the clamping rod (6); the outer diameters of the left and right ends of the clamping handle (7) are larger than the clamping groove, and the size of the clamping groove matches the diameter of the clamping rod (6).

6. The wellhead Christmas tree adapter according to claim 5, characterized in that: The clamping handle (7) is connected to the clamping rod (6) via threads.

7. The wellhead Christmas tree adapter according to claim 6, characterized in that: An end of the clamping handle (7) away from the clamping rod (6) is provided with a through operating hole.

8. The wellhead Christmas tree adapter according to claim 1, characterized in that: The fixed shaft (4) and the fixed block (1) are detachably connected.

9. The wellhead Christmas tree adapter according to claim 8, characterized in that: A plurality of vertically penetrating straightening grooves are provided on the inner side of each of the fixing blocks (1), a fixing shaft (4) is provided in each of the straightening grooves, and a clamping nut (9) is provided at the upper and lower ends of each fixing shaft (4), respectively.

10. The wellhead Christmas tree adapter according to claim 1, characterized in that: The total number of the straightening cuttings (3) is six.

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