High-pressure water injection wellhead device

Abstract

The invention discloses a high-pressure water injection well head device, and relates to the technical field of oil field drilling and production water injection, the high-pressure water injection well head device comprises a first shell, the lower end of the first shell is fixedly connected with a water outlet pipe, the upper end of the first shell is fixedly connected with a second shell, and a third shell is arranged above the second shell; the upper end of the third shell is fixedly connected with a water inlet pipe, the lower end of the second shell is connected with a backflow prevention mechanism, an annular groove is formed in the upper end of the second shell, a filtering mechanism is arranged in the annular groove, and four mounting grooves are formed in the inner wall of the third shell. The four mounting grooves are formed in the circumferential direction of the inner wall of the third shell at equal intervals. Impurities in water can be effectively filtered, it is guaranteed that the water is cleaner, the influence on the quality of an oil field is avoided, and the problem that a high-pressure water injection wellhead is prone to being damaged due to backflow of water in the oil field is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil field drilling and production, and in particular to a high-pressure water injection wellhead device. Background Art

[0002] Water injection wells are wells used to inject water into oil layers during oil field development. Their function is to maintain or restore the pressure of the oil layer, thereby enhancing the driving force of the oil reservoir to increase the production rate and recovery rate. There are strict requirements on the quality of water injected into oil fields, such as mechanical impurities, oil content, bacteria, etc.

[0003] If the water quality of the injection water is not properly treated or is polluted in the later stage, the water quality at the wellhead will exceed the standard. Therefore, the injected water must be filtered to ensure that its water quality meets the standard; and when the pressure inside the oil field changes during the process of injecting water into the oil field, the water in the oil field is easily backflowed, which can easily damage the high-pressure water injection wellhead. If it is not discovered in time, it will cause a lot of economic losses. Therefore, it is necessary to design a high-pressure water injection wellhead device to achieve the functions of water inlet filtration and water injection backflow prevention. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a high-pressure water injection wellhead device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A high-pressure water injection wellhead device comprises a first shell, a water outlet pipe is fixedly connected to the lower end of the first shell, a second shell is fixedly connected to the upper end of the first shell, a third shell is provided above the second shell, a water inlet pipe is fixedly connected to the upper end of the third shell, a backflow prevention mechanism is connected to the lower end of the second shell, an annular groove is provided at the upper end of the second shell, a filtering mechanism is provided inside the annular groove, four mounting grooves are provided on the inner wall of the third shell, the four mounting grooves are arranged at equal intervals along the circumference of the inner wall of the third shell, a clamping mechanism is provided inside each of the mounting grooves, four clamping grooves corresponding to the clamping mechanism are provided on the outer wall of the second shell, the four clamping grooves are arranged at equal intervals along the circumference of the outer wall of the second shell, and an operating mechanism connected to the clamping mechanism is provided outside the third shell.

[0006] As a further improvement of the present invention, the anti-backflow mechanism includes a movable plate arranged under the second shell, the upper end of the movable plate is fixedly connected with a blockage, and the blockage cooperates with the lower end opening of the second shell, the lower end of the second shell is provided with two movable grooves, and the interiors of the two movable grooves are provided with movable structures connected to the movable plate, and the movable structure includes a movable rod slidably inserted into the movable groove, the lower end of the movable rod is fixedly connected to the upper end of the movable plate, the upper end of the movable rod is fixedly connected to a connecting plate, the upper end of the connecting plate is fixedly connected to a tension spring, and the upper end of the tension spring is fixedly connected to the inner top wall of the movable groove.

[0007] As a further improvement of the present invention, the clamping mechanism includes a clamping block arranged inside the installation groove, a spring is fixedly connected to the side wall of the clamping block, one end of the spring away from the clamping block is fixedly connected to the inner wall of the installation groove, and the end of the clamping block away from the spring is provided with a slope.

[0008] As a further improvement of the present invention, the operating mechanism includes a moving ring slidably mounted on the outer wall of the third shell, and four traction ropes are fixedly connected to the lower surface of the moving ring. The four traction ropes pass through the side wall of the third shell, and the four traction ropes extend to four installation grooves respectively, and one end of the traction rope away from the moving ring is fixedly connected to the side wall of the block.

[0009] As a further improvement of the present invention, the filtering mechanism includes a ring plate arranged inside the annular groove, the lower end of the ring plate is fixedly connected to a cylindrical filter screen, the lower end of the ring plate is fixedly connected to a limiting ring, and the limiting ring is sleeved on the outside of the cylindrical filter screen.

[0010] As a further improvement of the present invention, guide wheels are provided on both the upper and lower sides of the traction rope, and the guide wheels are fixedly mounted on the outer wall of the third shell.

[0011] As a further improvement of the present invention, four connecting bolts are penetrated through the upper end of the second shell, and the four connecting bolts are arranged at equal intervals along the circumference of the second shell, and the connecting bolts are threadedly connected to the upper end of the first shell.

[0012] As a further improvement of the present invention, a sealing ring is embedded in the upper surface of the annular groove, and a sealing ring is embedded in the inner top wall of the third shell.

[0013] As a further improvement of the present invention, a handle is fixedly connected to the side wall of the first shell, and a valve is installed on the side wall of the water inlet pipe.

[0014] Beneficial effects of the present invention: By setting up a filtering structure, the water entering the third shell through the water inlet pipe will first be filtered through the cylindrical filter screen and then enter the second shell, which can effectively filter the impurities in the water, ensure that the water quality is cleaner, and avoid affecting the quality of the oil field.

[0015] By setting up the anti-backflow mechanism, when the water inlet pipe stops taking in water, no downward pressure will be generated on the plug. Under the tension of the tension spring, the tension spring contracts, driving the movable rod to move upward, and then driving the movable plate to move upward through the movable rod, so that the plug completes the blockage of the lower end of the second shell, effectively solving the problem of water backflow in the oil field, which may easily cause damage to the high-pressure water injection wellhead.

[0016] By setting up a card-fitting mechanism and acting on the card block through the elastic force of the spring, the card block can be inserted into the card slot, thereby realizing the card-fitting connection between the second shell and the third shell. When the second shell and the third shell need to be separated, it is only necessary to move the movable ring upwards and use the traction rope to pull the card block out of the card slot to release the connection between the second shell and the third shell, thereby making it convenient to take out the filter mechanism for cleaning, thereby facilitating cleaning by the staff and improving work efficiency.

[0017] By setting up an operating mechanism and moving the moving ring, the clamping block can be moved by pulling the traction rope, thereby making it convenient for the staff to operate four clamping mechanisms at the same time.

[0018] The present invention can effectively filter impurities in water, ensure that the water quality is cleaner, avoid the impact on the quality of the oil field, and effectively solve the problem of water backflow in the oil field, which easily causes damage to the high-pressure water injection wellhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a high-pressure water injection wellhead device proposed by the present invention; Figure 2 This is a schematic structural diagram of a second housing, a clamping groove, and an annular groove of a high-pressure water injection wellhead device proposed by the present invention; Figure 3 This is a structural schematic diagram of a third shell, a moving ring, a water inlet pipe, and a valve of a high-pressure water injection wellhead device proposed by the present invention; Figure 4 for Figure 1 Enlarged view of point A in the middle; Figure 5 for Figure 1 Enlarged view of point B in the middle.

[0020] In the figure: 1 a first shell, 2 a second shell, 3 connecting bolts, 4 a third shell, 5 annular grooves, 6 cylindrical filter screens, 7 limiting rings, 8 ring plates, 9 water inlet pipes, 10 valves, 11 plugs, 12 movable plates, 13 handles, 14 water outlet pipes, 15 slots, 16 movable rings, 17 guide wheels, 18 blocks, 19 mounting slots, 20 springs, 21 traction ropes, 22 tension springs, 23 movable slots, 24 movable rods, and 25 connecting plates. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1-Figure 5 , a high-pressure water injection wellhead device, comprising a first shell 1, a water outlet pipe 14 is fixedly connected to the lower end of the first shell 1, the water outlet pipe 14 is connected to the existing water injection wellhead, the upper end of the first shell 1 is fixedly connected to the second shell 2, the upper end of the second shell 2 is penetrated by four connecting bolts 3, the four connecting bolts 3 are arranged at equal intervals along the circumference of the second shell 2, the connecting bolts 3 are threadedly connected to the upper end of the first shell 1, a third shell 4 is arranged above the second shell 2, the upper end of the third shell 4 is fixedly connected to a water inlet pipe 9, the water inlet pipe 9 is externally connected to a water injection pump for water injection, a handle 13 is fixedly connected to the side wall of the first shell 1, a valve 10 is installed on the side wall of the water inlet pipe 9, the lower end of the second shell 2 is connected to an anti-backflow mechanism, the upper end of the second shell 2 is provided with an annular groove 5, the interior of the annular groove 5 is provided with a filtering mechanism, the filtering mechanism includes a ring plate 8 arranged inside the annular groove 5, the lower end of the ring plate 8 is fixedly connected to a cylindrical filter screen 6, the lower end of the ring plate 8 The end is fixedly connected with a limit ring 7, and the limit ring 7 is sleeved on the outside of the cylindrical filter 6. The water entering the third shell 4 through the water inlet pipe 9 will first be filtered through the cylindrical filter 6 and then enter the second shell 2, which can effectively filter the impurities in the water, ensure that the water quality is cleaner, and avoid the impact on the quality of the oil field. A sealing ring is embedded in the upper surface of the annular groove 5, and a sealing ring is embedded in the inner top wall of the third shell 4. The sealing ring can ensure the sealing between the third shell 4, the ring plate 8, and the annular groove 5. Four mounting grooves 19 are provided on the inner wall of the third shell 4. The four mounting grooves 19 are arranged at equal intervals along the circumferential direction of the inner wall of the third shell 4. A clamping mechanism is provided inside each mounting groove 19. Four clamping grooves 15 corresponding to the clamping mechanism are provided on the outer wall of the second shell 2. The four clamping grooves 15 are arranged at equal intervals along the circumferential direction of the outer wall of the second shell 2. An operating mechanism connected to the clamping mechanism is provided on the outside of the third shell 4.

[0023] In the present invention, the backflow prevention mechanism includes a movable plate 12 arranged below the second shell 2, the upper end of the movable plate 12 is fixedly connected with a plug 11, the plug 12 cooperates with the lower end opening of the second shell 2, the lower end of the second shell 2 is provided with two movable grooves 23, the interiors of the two movable grooves 23 are provided with movable structures connected to the movable plate 12, the movable structure includes a movable rod 24 slidably inserted in the movable groove 23, the lower end of the movable rod 24 is fixedly connected to the upper end of the movable plate 12, and the upper end of the movable rod 24 is fixedly connected with a connecting rod Plate 25, the upper end of the connecting plate 25 is fixedly connected with a tension spring 22, and the upper end of the tension spring 22 is fixedly connected to the inner top wall of the movable groove 23. When the water inlet pipe 9 flows water into the second shell 2, the pressure of the incoming water can push open the plug 11. When the water inlet pipe 9 stops flowing water, it will not generate downward pressure on the plug 11. Under the tension of the tension spring 22, the tension spring 22 contracts, driving the movable rod 24 to move upward, and then driving the movable plate 12 to move upward through the movable rod 24, so that the plug 11 completes the blocking of the lower end of the second shell 2.

[0024] The card-mounting mechanism includes a card block 18 arranged inside the installation groove 19, and a spring 20 is fixedly connected to the side wall of the card block 18. The end of the spring 20 away from the card block 18 is fixedly connected to the inner wall of the installation groove 19, and the end of the card block 18 away from the spring 20 is provided with a slope. The elastic force of the spring 20 acts on the card block 18, so that the card block 18 can be inserted into the card slot 15, thereby realizing the card-mounting connection between the second shell 2 and the third shell 4.

[0025] The operating mechanism includes a moving ring 16 slidably sleeved on the outer wall of the third shell 4, and four traction ropes 21 are fixedly connected to the lower surface of the moving ring 16. The four traction ropes 21 penetrate the side wall of the third shell 4, and the four traction ropes 21 extend to four installation grooves 19 respectively. One end of the traction rope 21 away from the moving ring 16 is fixedly connected to the side wall of the block 18. Furthermore, guide wheels 17 are provided on the upper and lower sides of the traction rope 21, and the guide wheel 17 is fixedly installed on the outer wall of the third shell 4. When the second shell 2 and the third shell 4 need to be separated, it is only necessary to move the moving ring 16 upward, and the block 18 is pulled out of the slot 15 by the traction rope 21 to release the connection between the second shell 2 and the third shell 4, so as to facilitate the removal of the filtering mechanism for cleaning, facilitate the cleaning of the staff, and improve the work efficiency.

[0026] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-pressure water injection wellhead device, characterized in that: The invention comprises a first shell (1), the lower end of the first shell (1) is fixedly connected to a water outlet pipe (14), the upper end of the first shell (1) is fixedly connected to a second shell (2), a third shell (4) is provided above the second shell (2), the upper end of the third shell (4) is fixedly connected to a water inlet pipe (9), the lower end of the second shell (2) is connected to an anti-backflow mechanism, the upper end of the second shell (2) is provided with an annular groove (5), the inside of the annular groove (5) is provided with a filtering mechanism, the inner wall of the third shell (4) is provided with four mounting grooves (19), the four mounting grooves (19) are arranged at equal intervals along the circumferential direction of the inner wall of the third shell (4), each mounting groove (19) is provided with a clamping mechanism, the outer wall of the second shell (2) is provided with four clamping grooves (15) corresponding to the clamping mechanism, the four clamping grooves (15) are arranged at equal intervals along the circumferential direction of the outer wall of the second shell (2), and the outside of the third shell (4) is provided with an operating mechanism connected to the clamping mechanism.

2. A high-pressure water injection wellhead device according to claim 1, characterized in that: The anti-backflow mechanism comprises a movable plate (12) arranged below the second shell (2); the upper end of the movable plate (12) is fixedly connected to a plug (11); the plug (12) cooperates with the lower end opening of the second shell (2); the lower end of the second shell (2) is provided with two movable grooves (23); the insides of the two movable grooves (23) are provided with movable structures connected to the movable plate (12); the movable structures comprise movable rods (24) slidably inserted into the movable grooves (23); the lower ends of the movable rods (24) are fixedly connected to the upper ends of the movable plate (12); the upper ends of the movable rods (24) are fixedly connected to a connecting plate (25); the upper ends of the connecting plates (25) are fixedly connected to a tension spring (22); the upper ends of the tension springs (22) are fixedly connected to the inner top wall of the movable grooves (23).

3. A high-pressure water injection wellhead device according to claim 1, characterized in that: The clamping mechanism comprises a clamping block (18) arranged inside the mounting groove (19), a spring (20) being fixedly connected to a side wall of the clamping block (18), an end of the spring (20) away from the clamping block (18) being fixedly connected to an inner wall of the mounting groove (19), and an end of the clamping block (18) away from the spring (20) being provided with an inclined surface.

4. A high-pressure water injection wellhead device according to claim 3, characterized in that: The operating mechanism comprises a moving ring (16) slidably mounted on the outer wall of the third shell (4); four traction ropes (21) are fixedly connected to the lower surface of the moving ring (16); the four traction ropes (21) penetrate the side wall of the third shell (4); and the four traction ropes (21) extend to four installation grooves (19) respectively; one end of the traction rope (21) away from the moving ring (16) is fixedly connected to the side wall of the clamping block (18).

5. A high-pressure water injection wellhead device according to claim 4, characterized in that: The filtering mechanism comprises an annular plate (8) arranged inside the annular groove (5), the lower end of the annular plate (8) being fixedly connected to a cylindrical filter screen (6), the lower end of the annular plate (8) being fixedly connected to a limit ring (7), and the limit ring (7) being sleeved on the outer side of the cylindrical filter screen (6).

6. A high-pressure water injection wellhead device according to claim 1, characterized in that: Guide wheels (17) are provided on both the upper and lower sides of the traction rope (21), and the guide wheels (17) are fixedly mounted on the outer wall of the third housing (4).

7. A high-pressure water injection wellhead device according to claim 1, characterized in that: Four connecting bolts (3) are provided through the upper end of the second shell (2), and the four connecting bolts (3) are arranged at equal intervals along the circumference of the second shell (2). The connecting bolts (3) are threadedly connected to the upper end of the first shell (1).

8. A high-pressure water injection wellhead device according to claim 1, characterized in that: A sealing ring is embedded in the upper surface of the annular groove (5), and a sealing ring is embedded in the inner top wall of the third shell (4).

9. A high-pressure water injection wellhead device according to claim 1, characterized in that: A handle (13) is fixedly connected to the side wall of the first shell (1), and a valve (10) is installed on the side wall of the water inlet pipe (9).

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