Wellhead desanding device for gas storage

Abstract

The utility model relates to the related technical field of gas storages, and particularly discloses a gas storage wellhead desanding device which comprises an oil pipe head, a reversing pipe, a gas production tree and a desander, a spiral gas channel and a gas outlet pipe are arranged in the desander, and a filter basket and a backflushing control assembly are arranged in the gas outlet pipe. The recoil control assembly comprises a center rod piece, an upper blocking ring, an upper blocking cover, a lower sleeve and a lower blocking cover, the center rod piece is in sliding connection with the filter basket, the upper blocking cover is connected to the upper portion of the center rod piece, an upper through hole is formed in the upper blocking cover, and a through hole staggered with the upper through hole in position is formed in an upper end cover of the filter basket; the lower blanking cap is fixedly connected to the bottom end of the center rod piece, and a lower through hole is formed in the lower blanking cap. According to the utility model, wellhead desanding is carried out on the produced gas of the gas storage, graded desanding treatment is carried out on silt through the desander, and the problem of blockage of filter holes of the filter element is reduced by utilizing a back flushing method on the filter element, so that the desanding rate is improved, and the maintenance frequency is obviously reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of gas storage facilities, specifically a sand removal device for gas storage wellheads. Background Technology

[0002] Produced gas from gas storage facilities often contains water, condensate oil, and solid particles such as silt. These require separation before being sent into the gathering and transmission pipelines. Silt, under high pressure, can cause erosion and corrosion to wellhead pipelines, valves, and instruments, significantly impacting equipment lifespan. Therefore, silt removal is typically performed after the first-stage throttle valve at the wellhead to prevent it from entering the downstream gas production tree and causing further losses. Currently, filters are installed at the wellhead, with internal filter components for filtration. However, due to the rapid movement of silt with natural gas, the presence of condensate oil and water in the natural gas, and the large volume of silt produced, the filter pores are easily clogged. This necessitates frequent filter maintenance. Since the filter components are generally located inside the wellhead pipeline, replacement requires disassembling part of the pipeline, which is cumbersome and disrupts normal gas production. Utility Model Content

[0003] The purpose of this utility model is to provide a sand removal device for gas storage wellheads to solve the problems mentioned in the background art, such as the sand removal filter being prone to clogging and requiring frequent maintenance and replacement.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A desand removal device for a gas storage wellhead includes: a tubing head, a reversing pipe, a gas production tree, and a desander. The reversing pipe is connected to an inlet pipe and an outlet pipe, and the desander is provided with a spiral air passage and an outlet pipe. The inlet of the spiral air passage is connected to the outlet pipe, and the outlet pipe is connected to the inlet pipe.

[0006] The air outlet pipe is equipped with a filter basket and a backflushing control assembly. The backflushing control assembly includes a central rod, an upper plug ring, an upper plug cover, a lower sleeve, and a lower plug cover. The central rod is slidably connected to the filter basket. The upper plug cover is connected to the upper part of the central rod and is located inside the filter basket. The upper plug ring is annular and fixedly connected to the upper plug cover, and is located above the annular space between the filter basket and the air outlet pipe. The upper plug cover has an upper through hole, and the upper end cover of the filter basket has through holes that are staggered with the upper through hole. The lower plug cover is fixedly connected to the bottom end of the central rod and has a lower through hole. The lower end of the filter basket is open. The lower sleeve is fixedly connected to the lower plug cover and fits against the inner wall of the filter basket. The bottom end of the air outlet pipe is closed, and an annular through groove is provided on the side of the bottom end.

[0007] As a further embodiment of this utility model: the two ends of the reversing pipe are respectively connected between the oil pipe head and the gas production tree, the air inlet pipe is connected to the gas production tree, and the air outlet pipe is connected to the oil pipe head.

[0008] As a further embodiment of this utility model: a cam mechanism is provided at the top of the central rod, the cam mechanism including a cam and upper and lower support members located above and below the cam and connected to the central rod, the cam being connected to a control rod provided on the air outlet pipe.

[0009] As a further embodiment of this invention, a filter is provided on the air intake pipe.

[0010] As a further embodiment of this utility model: the lower part of the sand remover is a cone, and the sand remover is also connected to a sand storage cylinder at the bottom end of the cone.

[0011] As a further embodiment of this utility model, a shut-off valve is provided between the sand storage cylinder and the cone cylinder.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model performs wellhead sand removal on the gas produced from the gas storage tank, uses a sand remover to classify and remove sand, and uses a back-flushing method on the filter element to reduce the problem of filter pore blockage, which not only improves the sand removal rate, but also significantly reduces the frequency of maintenance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the internal structure of the sand remover in this utility model.

[0015] Figure 3 This is a schematic diagram of the recoil control component in this utility model.

[0016] In the diagram, 1. Oil pipe head; 2. Reversing passage; 21. Inlet pipe; 211. Filter; 22. Outlet pipe; 3. Gas source tree; 4. Sand remover; 41. Outlet pipe; 411. Annular through groove; 42. Spiral air passage; 43. Filter basket; 44. Backflush control assembly; 441. Central rod; 442. Upper plug ring; 443. Upper plug cover; 4431. Upper through hole; 444. Lower sleeve; 445. Lower plug cover; 4451. Lower through hole; 446. Control rod; 447. Cam mechanism; 45. Cone cylinder; 5. Sand storage cylinder. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1 In this embodiment of the present invention, a desanding device for a gas storage wellhead includes: an oil pipe head 1, a reversing pipe 2, a gas production tree 3, and a desander 4. The two ends of the reversing pipe 2 are respectively connected between the oil pipe head 1 and the gas production tree 3. An inlet pipe 21 and an outlet pipe 22 are respectively connected to the reversing pipe 2. The inlet pipe 21 is connected to the gas production tree 3, and the outlet pipe 22 is connected to the oil pipe head 1. The desander 4 is provided with a spiral air passage 42 and an outlet pipe 41. The inlet of the spiral air passage 42 is connected to the outlet pipe 22, and the outlet pipe 41 is connected to the inlet pipe 21. Thus, the reversing pipe 2 guides the produced gas to the desander 4 and then sends it into the gas production tree 3.

[0019] like Figure 2 , 3 Below the sand separator 4 is a cone 45. A filter basket 43 and a backwash control assembly 44 are installed inside the air outlet pipe 41. The filter basket 43 has filter holes on its side for filtering sediment. The backwash control assembly 44 includes a central rod 441, an upper plug ring 442, an upper plug cover 443, a lower sleeve 444, and a lower plug cover 445. The central rod 441 is slidably connected to the filter basket 43. The upper plug cover 443 is connected to the upper part of the central rod 441 and is located inside the filter basket 43, i.e., below the upper end cover of the filter basket 43. The upper plug ring 442 is annular and fixedly connected to the upper plug cover 443, and the upper plug ring 442 is located between the filter basket 43 and the air outlet. Above the annular space between pipes 41, the upper plug 443 is provided with an upper through hole 4431, and similarly, the upper end cover of the filter basket 43 is provided with through holes that intersect with the upper through hole 4431. When the upper plug 443 and the upper end cover come into contact, the through holes on the two will block each other, thereby sealing the upper end of the filter basket 43. The lower plug 445 is fixedly connected to the bottom end of the central rod 441, and the lower plug 445 is provided with a lower through hole 4451. The lower end of the filter basket 43 is a capless structure. The lower sleeve 444 is fixedly connected to the lower plug 445 and fits against the inner wall of the filter basket 43. The bottom end of the air outlet pipe 41 is closed, and an annular through groove 411 is provided on the side of the bottom end.

[0020] A cam mechanism 447 is provided at the top of the central rod 441. The cam mechanism 447 includes a cam and upper and lower support members located above and below the cam and connected to the central rod 441. The cam is connected to a control rod 446 provided on the exhaust pipe 41. By rotating the control rod 446, the cam can be rotated and push the support members up or down to drive the central rod 441, i.e., the recoil control assembly 44, to move up and down.

[0021] The gas extracted from the gas storage tank enters the desander 4 through the oil pipe head 1. Guided by the spiral air passage 42, it forms a swirling flow. Centrifugal separation separates larger particles of sediment and water droplets from the gas, removing most of the sediment particles. A small number of tiny particles, due to insufficient centrifugal force, continue to flow with the gas and enter the outlet pipe 41 through the annular groove 411. Figure 2 In the intended state, the backflush control component 44 is in the lower stroke position. The upper plug ring 442 closes the annulus above, and the upper plug cover 443 is spaced apart from the upper end cover, allowing the upper end of the filter basket 43 to remain open. The lower plug cover 445 contacts the bottom end of the outlet pipe 41, sealing the lower plug cover 445. The lower sleeve 444 separates the annulus from the bottom end of the filter basket 43. At this time, gas enters the inner side of the filter basket 43 from the outside, while sediment is trapped outside the filter basket 43. The gas then flows from the top of the filter basket 43 into the inlet pipe 21. Within a certain gas sampling cycle, the backflush control component 44 moves upward. At this time, the upper plug ring 442 opens the annular space above, and the upper plug cover 443 contacts the upper end cover, sealing the upper end of the filter basket 43. The lower plug cover 445 moves up to the top of the annular groove 411 and detaches from the bottom of the outlet pipe 41. The through hole of the lower plug cover 445 opens, and natural gas enters the filter basket 43 from the bottom through the annular groove 411 and flows out from the side filter hole, entering the inlet pipe 21 through the annular space. During this process, the pressurized gas backflushes the filter basket 43, blowing off the particles adhering to it to avoid blockage. Therefore, the problem of filter blockage can be greatly reduced during the reciprocating cycle, reducing the frequency of replacement. The inlet pipe 21 is also equipped with a filter 211 to filter the small particles brought out at the beginning of the backflushing. The filter 211 is located outside the pipe and is easy to disassemble and replace. Therefore, it only needs to be replaced periodically. As long as the replacement is not carried out at the initial stage of backflushing, the filter 211 can be cut off and isolated by a valve before disassembly and reassembly, without affecting the gas extraction operation.

[0022] The sand separator 4 is also connected to a sand storage cylinder 5 at the bottom of the cone 45 to store the filtered mud and water. The sand storage cylinder 5 and the cone 45 are controlled by a shut-off valve so that the sand cleaning operation can be carried out without affecting the gas extraction operation.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sand removal device for a gas storage wellhead, comprising: The oil pipe head (1), reversing pipe (2), gas production tree (3) and desander (4) are characterized in that: the reversing pipe (2) is connected to an air inlet pipe (21) and an air outlet pipe (22) respectively; the desander (4) is provided with a spiral air passage (42) and an air outlet pipe (41); the inlet of the spiral air passage (42) is connected to the air outlet pipe (22); and the air outlet pipe (41) is connected to the air inlet pipe (21). The air outlet pipe (41) is equipped with a filter basket (43) and a backflushing control assembly (44). The backflushing control assembly (44) includes a central rod (441), an upper plug ring (442), an upper plug cover (443), a lower sleeve (444), and a lower plug cover (445). The central rod (441) is slidably connected to the filter basket (43). The upper plug cover (443) is connected to the upper part of the central rod (441) and is located inside the filter basket (43). The upper plug ring (442) is annular and is fixedly connected to the upper plug cover (443). The upper plug ring (442) is located between the filter basket (43) and the filter basket (445). Above the annular space between the air outlet pipes (41), the upper cover (443) is provided with an upper through hole (4431), and the upper end cover of the filter basket (43) is provided with through holes that are staggered with the position of the upper through hole (4431); the lower cover (445) is fixedly connected to the bottom end of the central rod (441), and the lower cover (445) is provided with a lower through hole (4451); the lower end of the filter basket (43) is a coverless structure; the lower sleeve (444) is fixedly connected to the lower cover (445) and fits against the inner wall of the filter basket (43); the bottom end of the air outlet pipe (41) is closed, and an annular through groove (411) is provided on the side of the bottom end.

2. The desanding device for a gas storage wellhead according to claim 1, characterized in that: The two ends of the reversing pipe (2) are respectively connected between the oil pipe head (1) and the gas tree (3), the air inlet pipe (21) is connected to the gas tree (3), and the air outlet pipe (22) is connected to the oil pipe head (1).

3. The desanding device for a gas storage wellhead according to claim 1, characterized in that: The top of the central rod (441) is provided with a cam mechanism (447), which includes a cam and upper and lower supports located above and below the cam and connected to the central rod (441). The cam is connected to a control rod (446) provided on the air outlet pipe (41).

4. A desanding device for a gas storage wellhead according to claim 1, characterized in that: A filter (211) is installed on the air intake pipe (21).

5. A sand removal device for a gas storage wellhead according to claim 1, characterized in that: Below the sand remover (4) is a cone (45), and a sand storage cylinder (5) is also connected to the bottom end of the cone (45).

6. A sand removal device for a gas storage wellhead according to claim 5, characterized in that: A shut-off valve is provided between the sand storage cylinder (5) and the cone cylinder (45).

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