Automatic medicine feeding device for natural gas well

Abstract

The utility model relates to a natural gas well automatic dosing device relates to natural gas collection equipment technical field, the utility model discloses a natural gas well automatic dosing device including box, be equipped with the baffle in the box, the baffle divides the box and is separated into first cavity and second cavity, first cavity is connected with the oil pipe, the inside of first cavity is equipped with the medicine cylinder for placing medicament, is equipped with the feeding hole on the baffle, one side of second cavity is connected with the bushing and is equipped with the piston in the inside, and the piston is connected with the medicine cylinder through the connecting assembly to drive the medicine cylinder and remove to the feeding hole, when the gas well liquid accumulation leads to the differential pressure of casing pressure to promote the piston of first cavity side and remove, make the connecting assembly and shift, and then drive the medicine cylinder and remove to the feeding hole on the baffle and be equipped with, make the medicament in the medicine cylinder under the action of gravity and fall into the gas well, can in the gas well liquid accumulation automatic timely dosing, thereby betterly discharge the gas well liquid accumulation, guarantee the smooth operation of production.

Description

Technical Field

[0001] This utility model relates to the field of natural gas extraction equipment technology, and in particular to an automatic chemical dosing device for natural gas wells. Background Technology

[0002] For water-producing gas wells, when the reservoir energy is insufficient to carry formation water to the surface, wellbore fluid will accumulate. This accumulation leads to an increase in the pressure differential between the tubing and casing, affecting the normal production of the gas well. Foam drainage gas production technology is typically employed to reduce the density of the fluid mixture in the wellbore, decrease bottomhole back pressure, improve the gas well's lifting capacity, and assist in fluid-carrying production. The dosage and cycle of chemical dosing vary depending on the gas flow rate, water production, and other factors of different gas wells.

[0003] Chinese patent CN203257401U discloses an automatic foam rod drainage gas production device that uses a timer to feed the material at regular intervals. However, in actual operation, the production status of gas wells is constantly changing, and operators need to track the changes in the pressure difference between the gas well's oil casing and the casing in real time. The technical solution of dynamically adding foam drainage agents according to the pressure difference and feeding the material at regular intervals does not well meet the actual production needs. Utility Model Content

[0004] This invention provides an automatic chemical dosing device for natural gas wells, which relies on the pressure difference between the oil casing and the gas well to complete the chemical dosing, thereby achieving automatic and timely chemical dosing when liquid accumulates in the gas well.

[0005] This utility model provides an automatic chemical dosing device for natural gas wells, including a housing. The housing is equipped with a partition, which divides the interior of the housing into a first cavity and a second cavity. The first cavity is connected to an oil pipe and has a chemical cylinder for placing chemicals inside. The partition has a feeding hole. One side of the second cavity is connected to a casing and has a piston inside. The piston is connected to the chemical cylinder through a connecting assembly to drive the chemical cylinder to move to the feeding hole.

[0006] In one embodiment, the connecting assembly includes a horizontal connector, a vertical connector, and a tray. The two ends of the horizontal connector are respectively connected to the piston and the vertical connector. A strip groove is provided on the partition for the vertical connector to move. The top of the vertical connector passes through the strip groove and is connected to the bottom of the tray. The tray is slidably disposed on the surface of the partition.

[0007] In one embodiment, the connecting assembly further includes guides parallel to the strip groove, and each side of the tray is connected to one of the guides.

[0008] In one embodiment, the tray has a plurality of first through holes for fixing the medicine cartridge, and the plurality of first through holes are arranged in a straight line.

[0009] In one embodiment, the horizontal connector has a plurality of second through holes, which are located below the first through holes and correspond one-to-one with the first through holes.

[0010] In one embodiment, the strip groove is connected to the feeding hole, and the width of the strip groove is smaller than the diameter of the feeding hole.

[0011] In one embodiment, the connecting assembly further includes a limiting plate and an elastic member, the limiting plate being located inside the first cavity and disposed opposite to the piston, and the two ends of the elastic member abutting against the piston and the limiting plate, respectively.

[0012] In one embodiment, the horizontal connector passes through the limiting plate, and the vertical connector is located on the side of the limiting plate opposite to the elastic member.

[0013] In one embodiment, a vent valve is provided on one side of the housing, and the vent valve is connected to the side of the second cavity away from the piston.

[0014] In one embodiment, the side of the first cavity is provided with a removable cover plate. Compared with existing technologies, the advantages of this invention are as follows: Since the first cavity is connected to the tubing, and one side of the second cavity is connected to the casing and contains a piston, when fluid accumulation in the gas well causes an increase in the pressure difference between the tubing and casing, the casing pressure will push the piston on one side of the first cavity to move, causing displacement of the connecting assembly. This displacement, in turn, moves the chemical dosing cylinder to the feeding hole on the partition plate, allowing the chemical in the cylinder to fall into the gas well under gravity, thus achieving automatic chemical dosing. This automatic chemical dosing device for natural gas wells utilizes the pressure difference between the tubing and casing to automatically and promptly add chemicals when fluid accumulates in the gas well, thereby better draining the accumulated fluid and ensuring smooth production. Attached Figure Description

[0015] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the idle state structure of the automatic chemical dosing device for natural gas wells in an embodiment of this utility model; Figure 2 This is a schematic diagram of the dosing state structure of the automatic dosing device for natural gas wells in an embodiment of this utility model; Figure 3 This is a top view of an embodiment of the present invention, showing the tray and medicine cylinder not in the dosing position; Figure 4 This is a top view of the tray and medicine cylinder in the dosing position in an embodiment of this utility model; Figure 5 This is a top view of the horizontal and vertical connecting parts in an embodiment of this utility model.

[0017] Figure label: 1. Box body; 11. First connector; 12. Second connector; 2. Partition; 3. Agent cylinder; 4. Piston; 5. Connecting assembly; 51. Horizontal connector; 52. Vertical connector; 53. Tray; 54. Guide; 55. Limiting plate; 56. Elastic element; 6. Vent valve; 7. Cover plate; 100. First cavity; 200. Second cavity; 300. Feeding hole; 400. Strip groove; 500. First through hole; 600. Second through hole. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 and Figure 2 As shown, an embodiment of the automatic chemical dosing device for natural gas wells of this utility model includes a housing 1. A partition 2 is provided inside the housing 1, dividing the interior of the housing 1 into a first cavity 100 and a second cavity 200. The first cavity 100 is connected to an oil pipe (not shown) via a first connector 11. A chemical cylinder 3 for holding chemicals is provided inside the first cavity 100. A feeding hole 300 is provided on the partition 2. One side of the second cavity 200 is connected to a casing (not shown) and a piston 4 is provided inside. The piston 4 is connected to the chemical cylinder 3 via a connecting assembly 5 to drive the chemical cylinder 3 to move to the feeding hole 300. The diameter of the feeding hole 300 is larger than the inner diameter of the chemical cylinder 3 to allow the chemicals to fall smoothly.

[0020] In this embodiment, the reagent cartridge 3 contains spherical or rod-shaped reagents. Since the first cavity 100 is connected to the tubing, and one side of the second cavity 200 is connected to the casing and contains a piston 4, when the gas well accumulates fluid, causing an increase in the pressure difference between the tubing and casing, the casing pressure will push the piston 4 on one side of the first cavity 100 to move, causing the connecting assembly 5 to shift. This, in turn, moves the reagent cartridge 3 to the feeding hole 300 on the partition 2. Since there is no partition 2 to support the reagent at the feeding hole 300, the reagent in the reagent cartridge 3 will fall into the gas well under gravity, achieving automatic reagent injection. This embodiment of the automatic natural gas well reagent injection device utilizes the pressure difference between the tubing and casing to automatically and promptly inject reagents when fluid accumulates in the gas well, thereby better draining the accumulated fluid and ensuring smooth production.

[0021] like Figure 2As shown, the connecting assembly 5 includes a horizontal connector 51, a vertical connector 52, and a tray 53. The two ends of the horizontal connector 51 are connected to the piston 4 and the vertical connector 52, respectively. A slot 400 is provided on the partition 2 for the vertical connector 52 to move. The top of the vertical connector 52 passes through the slot 400 and connects to the bottom of the tray 53. The tray 53 is slidably disposed on the surface of the partition 2. The medicine cylinder 3 has a certain height, and therefore its center of gravity is also relatively high. If the piston 4 directly drives the medicine cylinder 3 to move, the stability is poor, and it is also difficult to achieve isolation between the side of the piston 4 near the second connector 12 and the first cavity 100.

[0022] Therefore, in this embodiment, the connecting assembly 5 connects the piston 4 and the medicine cylinder 3. The strip groove 400 is opened on the side of the partition 2 away from the piston 4. The space on the side of the piston 4 near the second connector 12 is always isolated from the first cavity 100, so it will not affect the function of the piston 4. The tray 53 and the partition 2 have a large contact area. The medicine cylinder 3 is installed on the tray 53, which improves the stability of the medicine cylinder 3 when it moves.

[0023] like Figure 3 and Figure 4 As shown, the connecting assembly 5 also includes guide members 54, which are parallel to the strip groove 400. Each side of the tray 53 is connected to a guide member 54. The two guide members 54 clamp the tray 53 in the middle, so that the tray 53 can only move in a straight line, thereby ensuring that the agent in the agent cylinder 3 can fall accurately from the feed hole 300 into the gas well.

[0024] Furthermore, the tray 53 has multiple first through holes 500 for fixing the medicine cylinder 3. The multiple first through holes 500 are arranged in a straight line. The medicine in the medicine cylinder 3 passes through the first through hole 500 and then through the feeding hole 300. Multiple medicine cylinders 3 can be installed on the tray 53 at the same time, thereby realizing multiple medicine feeding and reducing the frequency of medicine replenishment.

[0025] like Figure 5 As shown, the horizontal connector 51 has multiple second through holes 600, which are located below the first through holes 500 and correspond one-to-one with the first through holes 500. To prevent the horizontal connector 51 from obstructing the falling medication, the horizontal connector 51 has second through holes 600 for the medication to pass through. Since the horizontal connector 51 is connected to the tray 53 via the vertical connector 52, the horizontal connector 51 and the tray 53 move synchronously. Therefore, the second through holes 600 are located below the first through holes 500 and correspond one-to-one with the first through holes 500.

[0026] like Figure 3 and Figure 4As shown, the strip groove 400 is connected to the feeding hole 300, and the width of the strip groove 400 is smaller than the diameter of the feeding hole 300. When the reagent cartridge 3 carrying the reagent moves above the strip groove 400, the size of the strip groove 400 is insufficient to allow the reagent to pass through, thus preventing premature release of the reagent.

[0027] In this embodiment, the feeding hole 300 is located near one end of the strip groove 400, so that the tray 53 only needs to move a short distance to dispense the medicine.

[0028] like Figure 1 and Figure 2 As shown, the connecting assembly 5 also includes a limiting plate 55 and an elastic element 56. The elastic element 56 is a spring. The limiting plate 55 is located inside the first cavity 100 and is positioned opposite to the piston 4. Both ends of the elastic element 56 abut against the piston 4 and the limiting plate 55, respectively, thus fixing one end of the elastic element 56. After the dosing is completed, as the gas well fluid is discharged, the oil-casing pressure difference decreases, and the piston 4 returns to its initial position under the action of the elastic force of the elastic element 56. When the gas well fluid increases, causing the oil-casing pressure difference to increase again, the piston 4 overcomes the elastic force of the elastic element 56 again, compresses the elastic element 56, and moves closer to the limiting plate 55 to perform the next dosing operation. This cycle repeats, enabling multiple automatic dosing operations and avoiding frequent replenishment of the dosing agent.

[0029] In this embodiment, the horizontal connector 51 passes through the limiting plate 55, and the vertical connector 52 is located on the side of the limiting plate 55 away from the elastic member 56. The limiting plate 55 has a porous structure to allow the horizontal connector 51 to pass through, which will not affect the movement of the horizontal connector 51, while the vertical connector 52 is always located on the side of the limiting plate 55 away from the elastic member 56 and will not pass through the limiting plate 55.

[0030] like Figure 1 and Figure 2 As shown, a vent valve 6 is provided on one side of the housing 1, and the vent valve 6 is connected to the side of the second cavity 200 away from the piston 4. When the medicine in the medicine cylinder 3 is used up, the vent valve 6 is opened to release the pressure and facilitate the replenishment of medicine.

[0031] In this embodiment, a detachable cover plate 7 is provided on the side of the first cavity 100. By removing the cover plate 7, the box 1 can be opened, so that medicine can be added to the medicine cylinder 3.

[0032] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An automatic chemical dosing device for natural gas wells, characterized in that, The device includes a housing with a partition that divides the interior of the housing into a first cavity and a second cavity. The first cavity is connected to an oil pipe and has a medicine cylinder for holding medicine inside. The partition has a feeding hole. One side of the second cavity is connected to a sleeve and has a piston inside. The piston is connected to the medicine cylinder through a connecting assembly to drive the medicine cylinder to move to the feeding hole.

2. The automatic chemical dosing device for natural gas wells according to claim 1, characterized in that, The connecting assembly includes a horizontal connector, a vertical connector, and a tray. The two ends of the horizontal connector are connected to the piston and the vertical connector, respectively. A strip groove is provided on the partition for the vertical connector to move. The top of the vertical connector passes through the strip groove and is connected to the bottom of the tray. The tray is slidably disposed on the surface of the partition.

3. The automatic chemical dosing device for natural gas wells according to claim 2, characterized in that, The connecting assembly also includes guide members, which are parallel to the strip groove, and each side of the tray is connected to one of the guide members.

4. The automatic chemical dosing device for natural gas wells according to claim 2, characterized in that, The tray has multiple first through holes for fixing the medicine cartridge, and the multiple first through holes are arranged in a straight line.

5. The automatic chemical dosing device for natural gas wells according to claim 4, characterized in that, The horizontal connector has multiple second through holes, which are located below the first through holes and correspond one-to-one with the first through holes.

6. The automatic chemical dosing device for natural gas wells according to claim 2, characterized in that, The strip groove is connected to the feeding hole, and the width of the strip groove is smaller than the diameter of the feeding hole.

7. The automatic chemical dosing device for natural gas wells according to claim 2, characterized in that, The connecting assembly further includes a limiting plate and an elastic element. The limiting plate is located inside the first cavity and is disposed opposite to the piston. The two ends of the elastic element abut against the piston and the limiting plate, respectively.

8. The automatic chemical dosing device for natural gas wells according to claim 7, characterized in that, The horizontal connector passes through the limiting plate, and the vertical connector is located on the side of the limiting plate opposite to the elastic member.

9. The automatic chemical dosing device for natural gas wells according to claim 1, characterized in that, A vent valve is provided on one side of the housing, and the vent valve is connected to the side of the second cavity away from the piston.

10. The automatic chemical dosing device for natural gas wells according to claim 1, characterized in that, The first cavity has a removable cover plate on its side.

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