Sulfur-containing gas well dosing device

Abstract

The utility model relates to the technical field of equipment for exploiting natural gas from wells, in particular to a sulfur-containing gas well dosing device which comprises more than two liquid medicine storage bins for storing sulfur-dissolving liquid and a liquid injection pipeline for injecting the sulfur-dissolving liquid in the liquid medicine storage bins into a shaft. The liquid medicine storage bins are used for storing sulfur dissolving liquid with different sulfur dissolving agent concentrations, the liquid medicine storage bins are communicated with the liquid injection pipeline, valves used for controlling connection and disconnection of the corresponding liquid medicine storage bins and the liquid injection pipeline are arranged between the liquid medicine storage bins and the liquid injection pipeline, and the liquid medicine storage bins with the high concentration can be opened by opening the valves corresponding to the liquid medicine storage bins with the high concentration. The liquid medicine with the high concentration is injected into the shaft through the liquid injection pipeline, sulfur can be removed more quickly through the liquid medicine with the high concentration, and the blockage removal efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment for extracting natural gas from a well, in particular to a dosing device for a sulfur-containing gas well. Background Art

[0002] For high-sulfur gas wells, the production process usually faces the problem of wellbore blockage caused by sulfur deposition. The current measures to remove the blockage include chemical agents. For example, a Chinese utility model patent with authorization announcement number CN217462132U discloses a continuous dosing device for high-sulfur gas wells that can be operated sustainably. The dosing device includes a continuous dosing mechanism, a wellhead sealing device and a uniform injection mechanism. The continuous dosing mechanism includes a liquid medicine storage tank, a high-pressure micro-metering pump, a ground pipeline, a small four-way, a large four-way, a pressure gauge, a valve, a casing, an oil pipe, a plug, a permanent separator and a pen tip. The uniform injection mechanism includes a medicine injection pipe, a pipe wall, a sulfur-dissolving agent channel and an impact sprayer. Before operation, a certain dose of sulfur-dissolving agent is pre-stored in the liquid medicine storage tank, the flow rate and injection amount of the high-pressure micro-metering pump are set, and the injection speed is appropriately selected. During operation, the high-pressure micro-metering pump injects the sulfur-dissolving agent into the medicine injection pipe in the well, and the medicine is sprayed out in a mist form through the water outlet on the medicine injection pipe in cooperation with the impact sprayer. The medicine is evenly distributed in the wellbore. After fully reacting with the sulfur deposit in the wellbore, it is dissolved and discharged out of the well together with the produced natural gas. The liquid medicine is a soluble sulfur liquid, the liquid medicine storage tank constitutes a liquid medicine storage bin, and the ground pipeline and the reagent injection pipe are used to form a liquid injection pipeline.

[0003] During the production of gas wells, the sulfur content of the gas in the formation will change, while the concentration of the sulfur-dissolving agent in the sulfur-dissolving liquid in the liquid storage tank of the above-mentioned dosing device is fixed, and adjusting the injection flow rate of the sulfur-dissolving agent has little effect on improving the desulfurization efficiency. Therefore, it can meet the needs under normal circumstances. However, when encountering severe sulfur deposition, it is difficult to meet the needs of rapid desulfurization, which in turn affects the deblocking efficiency. Utility Model Content

[0004] The utility model aims to provide a dosing device for sulfur-containing gas wells to solve the problem that the current dosing device for sulfur-containing gas wells uses a single concentration of sulfur-dissolving liquid and is difficult to quickly remove sulfur when encountering a situation of severe sulfur deposition, thereby affecting the efficiency of plugging removal.

[0005] The technical solution of the sulfur-containing gas well dosing device of the utility model is:

[0006] A dosing device for a sulfur-containing gas well comprises a medicine liquid storage bin for storing sulfur-dissolving liquid and a liquid injection pipeline for injecting the sulfur-dissolving liquid in the medicine liquid storage bin into a wellbore. More than two medicine liquid storage bins are provided, each medicine liquid storage bin is used to store sulfur-dissolving liquid with a different sulfur-dissolving agent concentration. The liquid injection pipeline comprises a main pipeline and branch pipelines respectively connected to each medicine liquid storage bin, and the branch pipelines are provided with valves for controlling the connection and disconnection between the corresponding medicine liquid storage bin and the main pipeline.

[0007] Furthermore, the dosing device includes a wellhead device connected to the injection pipeline, and the wellhead device is provided with a gas flow detection device for detecting changes in the produced gas flow rate.

[0008] Furthermore, the dosing device includes a controller, which is used to receive a gas flow signal from the gas flow detection device to control the opening and closing of the valve.

[0009] Furthermore, the drug adding device comprises a drug liquid storage tank, in which two or more mutually separated compartments are arranged, and the compartments constitute the drug liquid storage bin.

[0010] Furthermore, the compartments in the drug solution storage tank are distributed in the up and down directions.

[0011] Furthermore, the medicine liquid storage tank is arranged horizontally, the axis of the medicine liquid storage tank is a horizontal extension line, the branch pipeline is located on one side of the medicine liquid storage bin along the axis of the medicine liquid storage tank, and the extension direction of the main pipeline is consistent with the axis of the medicine liquid storage tank.

[0012] Furthermore, the medicine liquid storage tank is arranged horizontally, and the axis of the medicine liquid storage tank is a horizontal extension line.

[0013] Furthermore, the liquid medicine storage tank is provided with a liquid outlet interface, and the valve is connected between the branch pipeline and the liquid outlet interface.

[0014] Furthermore, the valve used to control the connection and disconnection between the corresponding liquid medicine storage bin and the main pipeline is a branch valve, and the main pipeline is also provided with a main valve.

[0015] Furthermore, the main valve is a manual valve, and the branch valve is an electrically controlled valve.

[0016] Beneficial effects: The utility model is improved on the basis of the prior art dosing device for sulfur-containing gas wells. By setting up more than two liquid medicine storage bins, sulfur-dissolving liquids with different sulfur-dissolving agent concentrations can be stored, so that the concentration of the sulfur-dissolving agent is stepped, and the branch pipelines and the main pipeline of the injection pipeline are coordinated, so that the sulfur-dissolving liquids in each liquid medicine storage bin enter the main pipeline through the corresponding branch pipeline, and valves are respectively arranged on each branch pipeline. Under normal circumstances, the valve corresponding to the liquid medicine storage bin storing a lower concentration can be opened to use the liquid medicine of a lower concentration for desulfurization. When encountering a situation where sulfur deposition is more serious, the valve corresponding to the liquid medicine storage bin storing a higher concentration can be opened to inject the liquid medicine of a higher concentration into the wellbore through the injection pipeline. The liquid medicine of a higher concentration can be used to remove sulfur more quickly and improve the efficiency of unblocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the sulfur-containing gas well dosing device of the embodiment of the utility model when in use;

[0018] Figure 2 for Figure 1 A schematic diagram of the liquid medicine storage tank and its connection with the injection pipeline;

[0019] Figure 3 for Figure 1 Schematic diagram of the wellhead assembly.

[0020] In the figure: 1. drug storage tank; 100. plugging plate; 101. cover; 102. partition; 103. first compartment; 104. second compartment; 105. third compartment; 106. main housing; 2. metering pump; 3. controller; 4. wellhead device; 5. casing; 6. oil pipe; 7. drug injection pipe; 8. plug; 9. permanent separator; 10. pen tip; 11. main pipeline; 12. branch pipeline; 13. first branch valve; 14. second branch valve; 15. third branch valve; 16. main valve; 17. gas flow meter. DETAILED DESCRIPTION

[0021] The sulfur-containing gas well dosing device of the utility model can store sulfur-dissolving liquids with different sulfur-dissolving agent concentrations by arranging more than two liquid medicine storage bins, so that the concentration of the sulfur-dissolving agent is stepped. Under normal circumstances, the valve corresponding to the liquid medicine storage bin storing the lower concentration can be opened to use the liquid medicine of the lower concentration for desulfurization. When encountering a situation where sulfur deposition is more serious, the valve corresponding to the liquid medicine storage bin storing the higher concentration can be opened to inject the liquid medicine of the higher concentration into the wellbore through the injection pipeline. The liquid medicine of the higher concentration can be used to remove sulfur more quickly, thereby improving the efficiency of unblocking.

[0022] The following is a specific description of the embodiment of the sulfur-containing gas well dosing device of the utility model:

[0023] like Figure 1 , Figure 2 , Figure 3 As shown, the dosing device for sulfur-containing gas wells includes a liquid medicine storage tank 1, a liquid injection pipeline, a metering pump 2, and a wellhead device 4. The liquid injection pipeline includes a connecting pipeline between the liquid medicine storage tank 1 and the metering pump 2, a connecting pipeline between the metering pump 2 and the wellhead device 4, and a medicine injection pipe 7 extending into the wellbore. The liquid medicine storage tank 1 is used to store sulfur-dissolving liquid, which contains sulfur-dissolving agent, and the sulfur-dissolving liquid can be injected into the wellbore through the liquid injection pipeline.

[0024] The connecting pipelines between the liquid medicine storage tank 1 and the metering pump 2, and the connecting pipelines between the metering pump 2 and the wellhead device 4 are ground pipelines. The ground pipelines play the role of connecting the liquid medicine storage tank 1, the metering pump 2 and the wellhead device 4, and are required to be able to withstand the pressure required for conveying the soluble sulfur liquid. The wellhead device 4 includes a small four-way and a large four-way. There are casing 5 and oil pipe 6 in the wellbore. The casing 5 and the oil pipe 6 are basic equipment in the gas well. The oil pipe 6 cooperates with the wellhead device 4 and the ground gas pipeline to produce the produced gas. The upper end of the reagent injection pipe 7 is connected to the wellhead device 4. A sprayer is provided on the reagent injection pipe 7 corresponding to the position where sulfur deposition is easy to occur in the gas well. The lower end of the reagent injection pipe 7 is provided with a plug 8 to ensure that sufficient pressure can be held up in the reagent injection pipe 7 to reach the critical pressure for atomizing the soluble sulfur liquid. The permanent separator 9 is connected to the oil pipe 6, and the pen tip 10 is connected to the end of the oil pipe 6.

[0025] In order to flexibly adapt to different sulfur deposition conditions in the wellbore, a number of liquid storage bins for storing sulfur-dissolving liquids of different concentrations are provided in the liquid storage tank 1. The liquid storage tank 1 includes a main shell 106, a plugging plate 100, a cover 101, and a partition 102 arranged in the main shell 106. The main shell 106 is a cylindrical structure, and its axis extends horizontally, that is, the liquid storage tank 1 is arranged horizontally, and the axis of the liquid storage tank 1 is a horizontal extension line. There are two plugging plates 100, which are respectively arranged at both ends of the main shell 106 to block the cylinder openings at both ends of the main shell 106. There are two partitions 102, which are arranged at intervals up and down and the plate surfaces are opposite. The two partitions 102 divide the space in the main shell 106 into three compartments, that is, three compartments are surrounded by two partitions 102, two blocking plates 100 and the main shell 106, and the compartments form a liquid medicine storage bin. The three compartments are the first compartment 103, the second compartment 104, and the third compartment 105. The three compartments are separated from each other. The compartments in the liquid medicine storage tank 1 are distributed in the upper and lower directions. The first compartment 103, the second compartment 104, and the third compartment 105 are arranged in sequence from top to bottom. Each compartment is used to store a concentration of sulfur-dissolving liquid, that is, the sulfur-dissolving agent concentration of the sulfur-dissolving liquid in each liquid medicine storage bin is different. In this embodiment, the sulfur-dissolving agent concentration of the sulfur-dissolving liquid in the first compartment 103 is 5%, the sulfur-dissolving agent concentration of the sulfur-dissolving liquid in the second compartment 104 is 10%, and the sulfur-dissolving agent concentration of the sulfur-dissolving liquid in the third compartment 105 is 20%.

[0026] The connecting pipeline between the liquid medicine storage tank 1 and the metering pump 2 includes a main pipeline 11 and a branch pipeline 12. The branch pipeline 12 corresponds to the liquid medicine storage tank one by one. One end of the main pipeline 11 is connected to the branch pipeline 12, and the other end is connected to the metering pump 2. The parts of each compartment located at one axial end of the liquid medicine storage tank 1 are respectively provided with liquid outlet interfaces, and the liquid outlet interfaces are arranged on the blocking plate 100. A branch valve is arranged at the liquid outlet interface. The first compartment 103 is provided with a first branch valve 13 at the liquid outlet interface, the second compartment 104 is provided with a second branch valve 14 at the liquid outlet interface, and the third compartment 105 is provided with a third branch valve 15 at the liquid outlet interface. Each branch valve is respectively connected to the branch pipeline 12. One end of the branch pipeline 12 is connected to the branch valve and the other end is connected to the main pipeline 11. The main pipeline 11 is arranged horizontally. A main valve 16 is arranged on the main pipeline 11. The main valve 16 is a manual valve, and the branch valve is an electric control valve. Each drug liquid storage bin can be connected to the injection pipeline through a branch valve. The branch valve is a valve used to control the connection and disconnection between the corresponding drug liquid storage bin and the injection pipeline. When the valve is closed, the corresponding drug liquid storage bin and the main pipeline 11 are blocked.

[0027] The liquid medicine storage tank 1 has two covers 101, which are respectively arranged at the two ends of the main housing 106. The covers 101 and the corresponding plugging plates 100 enclose a cavity, and the cavity and the compartment are separated from each other. The branch pipeline 12 is located on one side of the plugging plate 100, and the extension direction of the main pipeline 11 is consistent with the axial direction of the liquid medicine storage tank 1. Each branch valve, the branch pipeline 12 and the main valve 16 are located in a cavity enclosed by the cover 101 on one side and the corresponding plugging plate 100. The cover 101 can cover the valve for protection.

[0028] The wellhead device 4 is provided with a gas flow detection device for detecting changes in the produced gas flow rate, and the gas flow detection device is a gas flow meter 17. The small four-way and large four-way of the wellhead device 4 are respectively provided with gas flow meters 17. The dosing device includes a controller 3, which is fixed on the connecting pipeline between the metering pump 2 and the wellhead device 4 and is not connected to the connecting pipeline. The connecting pipeline serves as a fixed foundation. The controller 3 is used to receive the gas flow signal of the gas flow detection device to control the opening and closing of the branch valve. The controller 3 is also provided with an indicator light for indicating the corresponding flow change.

[0029] When in use, the main valve 16 on the main pipeline 11 is opened, and the dosing device is in a normal working state, that is, when sulfur deposition is not serious, the yellow indicator light on the controller 3 is on, the first branch valve 13 is in an open state, the second branch valve 14 and the third branch valve 15 are in a closed state, and the liquid storage tank formed by the first compartment 103 forms a passage with the injection pipeline, and the metering pump 2 continuously injects 5% concentration sulfur-dissolving liquid into the wellbore at a rate of 30ml / min. And the liquid can enter each branch pipeline to avoid pumping out when switching different liquid storage tanks.

[0030] When the gas flow meter 17 detects that the wellhead produced gas flow rate becomes smaller, a red indicator light on the controller 3 lights up, and the controller 3 controls the first branch valve 13 and the third branch valve 15 to close, and opens the second branch valve 14. At this time, the metering pump 2 injects the 10% concentration of dissolved sulfur in the second compartment 104 into the wellbore at a rate of 30 ml / min. In this state, after working continuously for 5 hours, the change of the wellhead gas flow is detected again. If the gas flow increases, the controller 3 opens the first branch valve 13, closes the second branch valve 14 and the third branch valve 15, and turns off the red light to restore to a normal working state; if the gas flow is almost unchanged or continues to decrease, the flow rate of the metering pump 2 is adjusted to 100 ml / min, and the controller 3 lights up two red indicator lights. The wellhead gas flow is detected again for 5 hours. If the gas flow increases, the controller 3 opens the first branch valve 13, closes the second branch valve 14 and the third branch valve 15, turns off the red light and lights up the yellow light to restore to a normal working state; if the gas flow is still almost unchanged or continues to decrease, the controller 3 opens the third branch valve 15, closes the first branch valve 13 and the second branch valve 14, and injects the 20% concentration of dissolved sulfur in the third compartment 105 into the wellbore. This can well adapt to the changes in sulfur deposition during the gas well production process. As the gas well production continues, the deposited sulfur in the wellbore will gradually accumulate and affect the produced gas flow to a certain extent. The low concentration of dissolved sulfur liquid can no longer meet the needs, so it is possible to switch to a high concentration of dissolved sulfur liquid, which can remove sulfur more quickly and improve the efficiency of unblocking.

[0031] In other implementations, a plurality of liquid medicine storage tanks may also be provided, each of which constitutes a liquid medicine storage bin.

[0032] In other implementations, the compartments in the liquid medicine storage tank may also be distributed horizontally. In this case, the branch valve is disposed on the outer peripheral surface of the main shell of the liquid medicine storage tank.

[0033] In other implementations, the drug liquid storage tank may also be arranged vertically, with the drug liquid storage bins distributed in the up-and-down direction, and the branch valve being arranged on the outer peripheral surface of the main shell of the drug liquid storage tank.

[0034] In other implementations, the main pipe may also include a horizontal pipe section and a vertical pipe section, the horizontal pipe section is connected to the metering pump, and each branch valve is directly connected to the vertical pipe section.

[0035] In other implementations, the main valve may also be an electrically controlled valve.

[0036] In other implementations, the branch valve may also be a manual valve, and the operator manually controls the opening and closing of the branch valve according to changes in the wellhead gas flow rate.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A dosing device for a sulfur-containing gas well, comprising a liquid storage tank for storing a sulfur-dissolving liquid and an injection pipeline for injecting the sulfur-dissolving liquid in the liquid storage tank into a wellbore, characterized in that: There are more than two liquid medicine storage bins, each of which is used to store sulfur-dissolving liquid with different sulfur-dissolving agent concentrations. The liquid injection pipeline includes a main pipeline and branch pipelines corresponding to each liquid medicine storage bin. The branch pipelines are provided with valves for controlling the connection and disconnection between the corresponding liquid medicine storage bin and the main pipeline.

2. The dosing device for sulfur-containing gas wells according to claim 1, characterized in that: The dosing device comprises a wellhead device connected to a liquid injection pipeline. The wellhead device is provided with a gas flow detection device for detecting changes in the produced gas flow.

3. The dosing device for sulfur-containing gas wells according to claim 2, characterized in that: The dosing device comprises a controller, which is used to receive a gas flow signal from a gas flow detection device to control the opening and closing of a valve.

4. The dosing device for sulfur-containing gas wells according to claim 1, 2 or 3, characterized in that: The dosing device comprises a liquid medicine storage tank, in which two or more compartments separated from each other are arranged, and the compartments constitute the liquid medicine storage bin.

5. The dosing device for sulfur-containing gas wells according to claim 4 is characterized in that: The compartments in the liquid medicine storage tank are distributed in the up and down directions.

6. The dosing device for sulfur-containing gas wells according to claim 5, characterized in that: The liquid medicine storage tank is arranged horizontally, with the axis of the liquid medicine storage tank being the horizontal extension line. The branch pipeline is located on one side of the liquid medicine storage bin along the axis of the liquid medicine storage tank, and the extension direction of the main pipeline is consistent with the axis of the liquid medicine storage tank.

7. The dosing device for sulfur-containing gas wells according to claim 4, characterized in that: The medicine liquid storage tank is arranged horizontally, and the axis of the medicine liquid storage tank is a horizontal extension line.

8. The dosing device for sulfur-containing gas wells according to claim 1, 2 or 3, characterized in that: The liquid medicine storage tank is provided with a liquid outlet interface, and the valve is connected between the branch pipeline and the liquid outlet interface.

9. The dosing device for sulfur-containing gas wells according to claim 1, 2 or 3, characterized in that: The valve used to control the opening and closing of the corresponding liquid medicine storage bin and the main pipeline is a branch valve, and the main pipeline is also provided with a main valve.

10. The dosing device for sulfur-containing gas wells according to claim 9, characterized in that: The main valve is a manual valve and the branch valve is an electric control valve.

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