High-pressure water injection wellhead device

Abstract

The utility model relates to the technical field of well head devices, in particular to a high-pressure water injection well head device which comprises a high-pressure water injection pump body and a high-pressure water pipe installed at the water outlet end of the high-pressure water injection pump body, a first flange on the high-pressure water pipe is connected with a second flange through a bolt, the second flange is fixed to a water injection tree, and an installation groove is formed in the surface of the second flange. A mounting block is embedded in the mounting groove, a fixing structure is fixed below the mounting block, and a sealing ring is embedded in the mounting block; the sealing device has the advantages that the two ends of the sealing ring are pre-pressed and positioned through the limiting blocks, displacement or looseness of the sealing ring is avoided, and the attaching effect of the sealing ring and the connecting disc is improved; the installation block is matched with the chamfers on the two sides to achieve larger contact area and wrapping performance, the upper end of the sealing ring in an unpressed state is higher than the limiting block, a pre-compression state is formed after installation, the sealing performance is enhanced, the sealing ring belongs to a quick-wear part, the sealing ring only needs to be bent and taken out along the folded edge of the installation block during disassembly, disassembly is convenient, and the replacement efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of wellhead devices, specifically a high-pressure water injection wellhead device. Background Technology

[0002] To improve oil production efficiency, high-pressure water injection can be used to control the flow of high-pressure water into the underground oil layer. Water, being denser, lies beneath the oil, a process known as water drive. This promotes the movement of crude oil from the reservoir towards the well. The wellhead assembly mainly consists of a casing head, tubing head, and a tree. The tree is replaced with a water injection tree, connected to a high-pressure water pump. The high-pressure water pump uses a mechanically driven piston to pressurize the water, giving it high-pressure energy, and then delivers it into the high-pressure water pipe through the high-pressure water outlet connector, thus achieving water injection. However, in existing technologies, the connection between the high-pressure water pipe and the water injection tree is sealed with a sealing ring. This sealing ring is a vulnerable component. The high pressure of the high-pressure water pipe generates a counter-force, which can create gaps between the pipe and the sealing ring, affecting the sealing effect.

[0003] In the prior art, such as a high-pressure water injection wellhead device with application number CN202411893130.2, the elastic force of a spring acts on the locking block, which can make the locking block lock into the locking groove, thereby realizing the locking connection between the second housing and the third housing. When it is necessary to separate the second housing and the third housing, simply move the moving ring upward and pull the locking block out of the locking groove by the traction rope to release the connection between the second housing and the third housing, thereby facilitating the removal of the filter mechanism for cleaning, which is convenient for the staff and improves the efficiency of the work.

[0004] However, in actual use, it is necessary to frequently disassemble the housing. The housing can only be disassembled by using a traction rope to move the moving ring upward and pull the locking block out of the slot, so as to replace the sealing ring. The sealing ring is often stuck in the flange and is difficult to disassemble. Utility Model Content

[0005] The purpose of this invention is to provide a high-pressure water injection wellhead device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: it includes a high-pressure water pump body, a high-pressure water pipe installed at the outlet end of the high-pressure water pump body, a flange one on the high-pressure water pipe connected to a flange two by bolts, the flange two being fixed to the water injection tree, an installation groove being opened on the surface of the flange two, an installation block being embedded in the installation groove, a fixing structure being fixed below the installation block, the installation block being deformable, and a sealing ring being embedded in the installation block.

[0007] Preferably, flange one is fixed to the other end of the high-pressure water pipe, and flange two is fixed to the water inlet on the side of the water injection tree.

[0008] Preferably, the fixing structure includes a connecting ring, a locking block, and a locking groove. There are two sets of locking blocks, which are respectively fixed on the inner and outer ring surfaces of the connecting ring. Each set of locking blocks has multiple blocks, and both sets of locking blocks are circumferentially distributed around the central axis of the connecting ring. The locking groove is a circular groove with a "convex" shaped cut. The locking groove is connected to the mounting groove. The upper end of the connecting ring extends into the mounting groove, and the upper surface of the connecting ring is fixed to the lower surface of the mounting block. The lower end of the connecting ring extends into the locking groove. The locking block is located inside the locking groove and is blocked by the opening of the locking groove. The locking block is a plastic block.

[0009] Preferably, the mounting block has a frame structure with an isosceles trapezoidal cross-section. The top surface of the mounting block has a groove, and the sealing ring is located in the groove. Two sets of limiting blocks are fixed at the ends of the mounting block, and the two sets of limiting blocks respectively engage the two ends of the sealing ring. The two sides of the mounting groove have chamfers. After the flange one and flange two are installed, the two protruding sides of the mounting block fit into the chamfers of the mounting groove, and the limiting blocks on the mounting block are flush with the surface of flange two. When the sealing ring and the mounting block are in the initial state, the height of the upper surface of the mounting block is higher than the height of the upper surface of flange two, and the upper end of the sealing ring is higher than the upper surface of the limiting block. Both the mounting block and the sealing ring are made of elastic material.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The high-pressure water injection wellhead device proposed in this utility model uses a limiting block to pre-compress and position the two ends of the sealing ring, preventing the sealing ring from shifting or loosening, and improving the fit between the sealing ring and the connecting plate. The mounting block, with its chamfered sides, achieves a larger contact area and better containment, allowing the upper end of the sealing ring to protrude above the limiting block when not under pressure. After installation, it forms a pre-compressed state, enhancing the sealing performance. Due to the high pressure of the high-pressure water pipe, the high-pressure water pipe generates a force in the opposite direction. Under the tough deformation of the mounting block, it always fits tightly against the connecting plate, achieving a better sealing effect. At the same time, the sealing ring is a vulnerable part. When disassembling, it is only necessary to bend along the folded edge of the mounting block to both sides and then remove the sealing ring, which is convenient for disassembly and improves replacement efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0014] Figure 3 This utility model Figure 2 Mid-top view of the structure;

[0015] Figure 4 This utility model Figure 3Schematic diagram of the cross-sectional structure along the middle AA direction;

[0016] Figure 5 This utility model Figure 4 Enlarged structural diagram at point B;

[0017] Figure 6 This is a schematic diagram of the flange structure of this utility model;

[0018] Figure 7 This utility model Figure 6 Top view structural diagram

[0019] Figure 8 This utility model Figure 7 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0020] Figure 9 This utility model Figure 8 Enlarged structural diagram at point C;

[0021] Figure 10 This is a schematic diagram of the sealing ring of this utility model in its unused state;

[0022] Figure 11 This utility model Figure 10 Mid-top view of the structure;

[0023] Figure 12 This utility model Figure 11 Schematic diagram of the cross-sectional structure along the CC direction;

[0024] Figure 13 This utility model Figure 12 Enlarged structural diagram at point D.

[0025] In the diagram: 1. High-pressure water injection pump body; 2. High-pressure water pipe; 3. Flange 1; 4. Flange 2; 5. Water injection tree; 6. Mounting groove; 7. Sealing ring; 8. Connecting ring; 9. Clamping block; 10. Mounting block; 11. Limiting block; 12. Clamping groove; 13. Tubing head; 14. Casing head; 15. Oil well environment. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] Example 1

[0028] Please see Figures 1-13 This utility model provides a technical solution: a high-pressure water injection wellhead device, including a high-pressure water injection pump body 1, a high-pressure water pipe 2 installed at the outlet end of the high-pressure water injection pump body 1, a flange 3 on the high-pressure water pipe 2 connected to a flange 4 by bolts, the flange 4 being fixed to the water injection tree 5, the flange 3 being fixed to the other end of the high-pressure water pipe 2, and the flange 4 being fixed to the water inlet on the side of the water injection tree 5. The high-pressure water injection pump body 1 is placed on the oil well environment 15, usually at a distance of tens of meters to several kilometers from the wellhead. Then, the water is injected into the high-pressure water inlet on the side of the water injection tree through the high-pressure water pipe 2. The gate valve on the water injection tree 5 is opened to control whether high-pressure water is allowed to flow into the water injection tree 5. The bottom end of the water injection tree 5 is connected to the upper end of the tubing head 13 by a flange. The bottom end of the tubing head 13 is connected to the casing head 14 by a flange. The water flows downward directly into the tubing head 13, then through the casing head 14, and finally into the wellbore of the oil well environment 15.

[0029] Specifically, according to Figure 1 It can be seen that the high-pressure water injection pump 1, such as the three-cylinder reciprocating plunger pump QF-3S1600 / 25, drives the plunger to reciprocate through a motor, pressurizing the low-pressure water to 20-70MPa, and then entering the high-pressure water pipe 2 from the high-pressure outlet and delivering it to the water injection tree 5; the water injection tree 5, such as the X-series water injection tree conforming to API 6A standards, is equipped with a side high-pressure water inlet and a main channel, and is equipped with a gate valve to control the high-pressure water to flow downward into the tubing string; the bottom of the water injection tree 5 is connected to the tubing head 13, such as the FC-type tubing head flange, and the tubing head 13 is equipped with a tubing hanger to support and seal the tubing string, and at the same time, it is equipped with an annular sealing structure between it and the casing head 14; the casing head 14, such as the SPC or FMC series casing head, is installed at the top of the casing, and the space between the tubing and the casing is sealed by the annular seal to ensure that the high-pressure water does not leak or cross-layer during the water injection process, thereby achieving efficient and safe formation water injection.

[0030] Example 2

[0031] On the basis of the first embodiment, in order to enhance the sealing effect between the high-pressure water pipe and the injection tree, a mounting groove 6 is provided on the surface of the second flange 4. A mounting block 10 is embedded in the mounting groove 6, and a fixing structure is fixed below the mounting block 10. The fixing structure includes a connecting ring 8, a clamping block 9 and a clamping groove 12. There are two groups of clamping blocks 9, which are respectively fixed on the inner ring surface and the outer ring surface of the connecting ring 8, and each group of clamping blocks 9 has multiple ones. The two groups of clamping blocks 9 are circumferentially distributed around the central axis of the connecting ring 8. The clamping groove 12 is a circular ring groove with a "convex" shaped break, and the clamping groove 12 communicates with the mounting groove 6. The upper end of the connecting ring 8 extends into the mounting groove 6, the upper surface of the connecting ring 8 is fixed on the lower surface of the mounting block 10, the lower end of the connecting ring 8 extends into the clamping groove 12, the clamping block 9 is inside the clamping groove 12, and the clamping block 9 is blocked by the notch of the clamping groove 12. The clamping block 9 is a plastic block, the mounting block 10 is deformable, a sealing ring 7 is embedded in the mounting block 10, the mounting block 10 has a frame structure with an isosceles trapezoidal cross-section, a groove is provided on the top surface of the mounting block 10, the sealing ring 7 is located in the groove, and two groups of limiting blocks 11 are fixed at the ends of the mounting block 10. The two groups of limiting blocks 11 respectively clamp the two ends of the sealing ring 7. Chamfers are provided on both sides of the mounting groove 6. After the first flange 3 and the second flange 4 are installed, the two protruding sides of the mounting block 10 are fitted to the chamfers of the mounting groove 6, and the limiting blocks 11 on the mounting block 10 are flush with the surface of the second flange 4. When the sealing ring 7 and the mounting block 10 are in the initial state, the height of the upper surface of the mounting block 10 is higher than the height of the upper surface of the second flange 4, and the upper end of the sealing ring 7 is higher than the upper surface of the limiting block 11. Both the mounting block 10 and the sealing ring 7 are made of elastic materials.

[0032] Specifically, referring to Figure 5 and Figure 13 , first, the clamping block 9 is aligned with the clamping groove 12. The clamping block 10 is made of plastic reinforced polypropylene material, and its shape enables it to be accurately inserted into the inner wall of the clamping groove 12. And when disassembling, only according to the shape of the clamping block 10, it can be quickly disengaged from the clamping groove 12, which plays a role in stabilizing the mounting block 10 both radially and axially, preventing the mounting block 10 from带动the sealing ring 7 to fall off when disassembling the connecting disc; the mounting block 10 is made of modified polyurethane elastomer (TPU) or composite rubber-plastic blend material, which has excellent elastic recovery ability and compression set resistance performance. The mounting block 10 can adapt to the slight deformation of the flange structure during the assembly process, achieve directional plastic fitting, and is not prone to cracking or fatigue cracking under high pressure after installation. It is generally in an isosceles trapezoidal shape, and a groove is also provided on its surface for accommodating the sealing ring 7. Its two side edges protrude, adapting to the inner wall contour of the mounting groove 6, facilitating pressing and covering the sealing ring 7 during installation. Due to the high pressure of the high-pressure water pipe generating a reverse force, under the ductile deformation of the mounting block 10, it always closely adheres to the flange, achieving a better sealing effect. When the connecting discs are installed together, referring to Figure 3 and Figure 5It can be seen that flange 3 presses against sealing ring 7, and then, refer to Figure 13 Because the sealing ring 7 and the mounting block 10 protrude from the mounting groove 6 and are higher than the flange 4, when the flange 3 is tightened, the mounting block 10 will bend to both sides along the bottom edge and fit against the chamfer of the mounting groove 6. Its own preload ensures that the sealing ring 7 fits tightly against the flange 3. If disassembly is required, the mounting block 10, without external force, refers to... Figure 13 When the angle of the folded edge at the bottom of the mounting block 10 becomes smaller, the mounting block 10 is bent to both sides, so that the limiting block 11 on the mounting block 10 can easily disengage from the end of the sealing ring 7, thus enabling quick replacement of the sealing ring 7.

[0033] When using, refer to Figure 5 and Figure 13 First, the locking block 9 is aligned with the locking slot 12. The locking block 10 is made of molded reinforced polypropylene material. Its shape allows it to be precisely locked into the inner wall of the locking slot 12. During disassembly, the locking block 10 can be quickly released from the locking slot 12 based on its shape. This provides radial and axial stability for the mounting block 10, preventing the sealing ring 7 from falling off when the connecting plate is disassembled. The mounting block 10 is made of modified polyurethane elastomer (TPU) or a composite rubber-plastic blend, possessing excellent elastic recovery and resistance to compression set. The mounting block 10 is used during assembly... During the process, it can adapt to the slight deformation of the flange structure, achieving directional plastic fitting. After installation, it is not prone to cracking or fatigue cracking under high pressure. The overall shape is an isosceles trapezoid, and its surface is also grooved to accommodate the sealing ring 7. Its two side edges protrude to fit the inner wall contour of the mounting groove 6, making it easy to press and cover the sealing ring 7 during installation. Due to the high pressure of the high-pressure water pipe, the high-pressure water pipe generates a reverse force. Under the ductile deformation of the mounting block 10, it always fits tightly against the flange, achieving a better sealing effect. When the connecting plates are installed together, refer to Figure 3 and Figure 5 It can be seen that flange 3 presses against sealing ring 7, and then, refer to Figure 13 Because the sealing ring 7 and the mounting block 10 protrude from the mounting groove 6 and are higher than the flange 4, when the flange 3 is tightened, the mounting block 10 will bend to both sides along the bottom edge and fit against the chamfer of the mounting groove 6. Its own preload ensures that the sealing ring 7 fits tightly against the flange 3. If disassembly is required, the mounting block 10, without external force, refers to... Figure 13 When the angle of the folded edge at the bottom of the mounting block 10 becomes smaller, the mounting block 10 is bent to both sides, so that the limiting block 11 on the mounting block 10 can easily disengage from the end of the sealing ring 7, thus enabling quick replacement of the sealing ring 7.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure water injection wellhead device, comprising a high-pressure water injection pump body (1), a high-pressure water pipe (2) installed at the outlet end of the high-pressure water injection pump body (1), a flange one (3) on the high-pressure water pipe (2) being bolted to a flange two (4), the flange two (4) being fixed to a water injection tree (5), characterized in that: The flange 2 (4) has an installation groove (6) on its surface. An installation block (10) is embedded in the installation groove (6). A fixing structure is fixed below the installation block (10). The installation block (10) is deformable. A sealing ring (7) is embedded in the installation block (10).

2. The high-pressure water injection wellhead device according to claim 1, characterized in that: The flange one (3) is fixed to the other end of the high-pressure water pipe (2), and the flange two (4) is fixed to the water inlet on the side of the water injection tree (5).

3. The high-pressure water injection wellhead device according to claim 1, characterized in that: The fixing structure includes a connecting ring (8), a locking block (9), and a locking groove (12). There are two sets of locking blocks (9). The two sets of locking blocks (9) are fixed on the inner ring surface and the outer ring surface of the connecting ring (8), respectively. Each set of locking blocks (9) has multiple blocks. The two sets of locking blocks (9) are distributed in a circle around the central axis of the connecting ring (8). The locking groove (12) is a circular groove with a "convex" shaped break. The locking groove (12) is connected to the mounting groove (6). The upper end of the connecting ring (8) extends into the mounting groove (6). The upper surface of the connecting ring (8) is fixed to the lower surface of the mounting block (10). The lower end of the connecting ring (8) extends into the locking groove (12). The locking block (9) is inside the locking groove (12) and is blocked by the opening of the locking groove (12). The locking block (9) is a plastic block.

4. The high-pressure water injection wellhead device according to claim 1, characterized in that: The mounting block (10) has a frame structure with an isosceles trapezoidal cross section. The top surface of the mounting block (10) has a groove, and the sealing ring (7) is located in the groove. Two sets of limiting blocks (11) are fixed at the ends of the mounting block (10). The two sets of limiting blocks (11) respectively engage the two ends of the sealing ring (7). The two sides of the mounting groove (6) have chamfers. After the flange one (3) and flange two (4) are installed, the two protruding sides of the mounting block (10) fit into the chamfer of the mounting groove (6), and the limiting blocks (11) on the mounting block (10) are flush with the surface of flange two (4). When the sealing ring (7) and the mounting block (10) are in the initial state, the height of the upper surface of the mounting block (10) is higher than the height of the upper surface of flange two (4), and the upper end of the sealing ring (7) is higher than the upper surface of the limiting block (11). The mounting block (10) and the sealing ring (7) are both made of elastic material.

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