High-pressure wellhead two-stage serial self-energizing water pumping sand remover and working method

Abstract

The present invention discloses a high-pressure wellhead two-stage series self-charged water pumping desander and a working method. The inner cavity of the first-stage separator is provided with a first-stage water pumping pipe, the bottom of the inner cavity of the second-stage separator is provided with a second-stage water pumping pipe, an energy storage motor is provided in the second-stage separator, a self-charged element is provided in the second-stage separator, and a water pump body is provided at the end of the first-stage water pumping pipe or the second-stage water pumping pipe; the energy storage motor includes an electric motor and an energy storage device, an energy converter is provided inside the self-charged element; and a cleaning trigger mechanism is provided in the first-stage water pumping pipe. The present invention realizes automatic removal of internal accumulated water by providing an internal water pumping mechanism. The drainage pipe used in the present invention does not need to be connected to the outside of the desander, thereby ensuring the continuous operation of the desander. The gas power of natural gas itself is relied on to generate energy and pump water, thereby realizing the extraction and discharge of accumulated water.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas field development, and particularly relates to a high-pressure wellhead two-stage serial self-energy-charging water pumping desander and a working method. BACKGROUND

[0002] In natural gas exploitation, the raw gas directly extracted from the gas well often contains a small amount of sand particles. In recent years, in order to increase production, a large amount of fracturing operation is adopted, and a part of the proppant sand carried in the fracturing fluid will also rise to the wellhead with the exploited natural gas. If the sand particles are not removed, the sand particles will erode the pipeline and even block the pipeline, which will seriously affect the service life of the gas transmission system. Therefore, a desander is generally used for sand removal in a gas field.

[0003] The desander of the prior art generally adopts the effect of gravity separation, that is, the sand particles are left in the lower sand accumulation cylinder, and the natural gas continues to flow in the upper part. Natural gas exploitation has its own characteristics. First, natural gas and crude oil are often a reservoir system with bottom water or edge water. With the exploitation process of natural gas, the elastic energy of the water body will drive the water to channel into the gas reservoir along the high-permeability zone, and will be carried out of the wellhead together with the natural gas. Since the natural gas extracted from the well contains water droplets or water vapor, the water droplets or water vapor are easy to condense and remain in the desander during the sand removal process. Once too much water is accumulated in the desander, the pipeline will be blocked, and the removed sand particles will be adhered to the equipment, which is difficult to remove, causing trouble to the normal operation of the desander, and even blocking the desander.

[0004] Patent application No. CN209228350U, entitled "Natural gas exploitation sand and water removal device", provides a three-stage separation method, in which a copper sulfate drying agent is used to dry the gas in one step. However, this method has high installation difficulty, consumes materials, and needs to be replaced at irregular intervals. Since the desander is a high-pressure mechanism, disassembly and installation will greatly affect the sealing performance, greatly consume labor, and cause the desanding work to be suspended, which is not easy to use in actual natural gas purification processes. SUMMARY

[0005] In order to overcome the problems in the prior art, the purpose of the present application is to provide a high-pressure wellhead two-stage serial self-energy-charging water pumping desander and a working method. By adding an internal water removal device inside, the internal water can be automatically discharged without the aid of any external energy supply mechanism without damaging the internal pressure.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is:

[0007] A high-pressure wellhead two-stage serial self-energy-charging water pumping desander comprises:

[0008] A primary separator is connected with a primary sand accumulation cylinder through a gas-sand cutoff valve;

[0009] A secondary separator is connected with a secondary sand accumulation cylinder through a gas-sand cutoff valve;

[0010] A connecting pipeline is connected with the primary separator and the secondary separator respectively at two ends thereof;

[0011] The inner cavity of the primary separator is provided with a primary water pumping pipe, the bottom of the inner cavity of the secondary separator is provided with a secondary water pumping pipe, and the primary water pumping pipe is in communication with the secondary water pumping pipe; the secondary separator is provided with an energy storage motor and a self-charging element, the self-charging element is arranged at the outlet of the secondary separator; the end of the primary water pumping pipe or the secondary water pumping pipe is provided with a water pumping pump body; the energy storage motor and the energy storage device are arranged in the cavity of the secondary separator, and the energy storage device is connected with the self-charging element; the energy converter is arranged in the self-charging element; the primary water pumping pipe is provided with a cleaning trigger mechanism, the cleaning trigger mechanism comprises a blocking ring and a blocking cylinder assembly; the bottom of the primary water pumping pipe is provided with a water pumping hole, the blocking ring is fixed on the water pumping hole, and the blocking cylinder assembly is movably sleeved on the primary water pumping pipe close to one end of the bottom of the primary separator; the end of the blocking ring close to the blocking cylinder assembly is provided with a touch section, and the touch section is connected with the energy storage motor.

[0012] Optionally, neither the primary water pumping pipe nor the secondary water pumping pipe extends into the valve plate of the gas-sand cutoff valve.

[0013] Optionally, the blocking cylinder assembly comprises an upper blocking cylinder, a lower floating cylinder and a connecting rod, the upper blocking cylinder and the lower floating cylinder are arranged on the upper side and the lower side of the blocking ring respectively, and the upper blocking cylinder and the lower floating cylinder are connected through the connecting rod.

[0014] Optionally, an inlet pipeline is connected to the primary separator, an outlet pipeline is connected to the secondary separator, and the self-charging element is arranged between the contact surface of the secondary separator and the outlet pipeline.

[0015] Optionally, the self-charging element is a hollow rotary body structure, the energy converter is arranged at the end of the reduced diameter section in the self-charging element.

[0016] Optionally, the energy converter is a spiral blade structure.

[0017] Optionally, a water suction flow channel connected from the water pumping pump body to the outlet pipeline is arranged in the wall of the self-charging element.

[0018] Optionally, the blocking ring comprises a blocking ring body, and a plurality of fixing buckles are arranged on two sides of the blocking ring body.

[0019] Optionally, the end side of the secondary water pumping pipe is provided with a plurality of rows of small holes.

[0020] The working method of the high-pressure wellhead two-stage serial self-energy-charging water pumping and sand removing device comprises the following steps:

[0021] S1: natural gas with sand particles and water is made to flow into the primary sand remover and enter the secondary sand remover through the connecting pipeline, the energy converter is made to generate electricity by the gas, and the electricity is stored in the energy storage device;

[0022] S2: when the water level in the primary sand remover contacts the blocking cylinder assembly, the entire cleaning trigger mechanism is driven to move upwards, touches the touch section, and the water pumping pump body is started to form a vacuum area in the primary water pumping pipe and the secondary water pumping pipe and drive the gas and water to be pumped away;

[0023] S3: after ensuring that the touch section is not in contact with the cleaning trigger mechanism, the water pumping pump body is stopped, the cleaning trigger mechanism falls, and the cleaning trigger mechanism is limited by the blocking ring.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The present application realizes automatic drainage of the internal accumulated water, so that the accumulated water can flow into the subsequent water removing and drying process. The drainage pipe used in the present application does not need to be communicated with the outside of the sand remover, avoiding possible influence on the internal pressure. The internal self-provided energy production and supply equipment, through internal structure design and improvement, can install new components without additional modification of the sand remover structure, rely on the gas power of natural gas itself to generate energy and pump water, realize the pumping and discharge of accumulated water, without additional disassembly and replacement of the energy supply device or the setting of the energy supply mechanism through the wall of the sand remover, and can automatically clean the pipeline and adjust the water pumping time according to the water level, ensuring the safety of the construction and use of the site and the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shapes and proportions of the components. In the drawings:

[0027] Figure 1 is a perspective view of the external structure of the present application;

[0028] Figure 2It is a schematic view of the sectional internal structure of the present application;

[0029] Figure 3 It is a rear longitudinal sectional view of the present application;

[0030] Figure 4 It is Figure 3 The enlarged view of the middle part of

[0031] Figure 5 It is Figure 3 The partial schematic view of area A of

[0032] Figure 6 It is Figure 5 The partial sectional schematic view;

[0033] Figure 7 It is Figure 3 The partial schematic view of area B of

[0034] Figure 8 It is a sectional view of the cleaning trigger mechanism;

[0035] Figure 9 It is a bottom view of the blocking ring;

[0036] Wherein, 1-first stage separator, 2-first stage sand accumulation cylinder, 3-second stage separator, 4-second stage sand accumulation cylinder, 5-gas sand cutoff valve, 6-inlet pipeline, 7-outlet pipeline, 8-connection pipeline, 9-connection column, 10-first stage water pumping pipe, 11-second stage water pumping pipe, 12-self-charging energy element, 13-energy storage electric device, 101-pipe section one, 102-pipe section two, 103-pipe section three, 104-adaptor, 105-adaptor fixing ring, 106-cleaning trigger mechanism, 121-self-charging energy element body, 122-charging flow channel, 123-water suction flow channel, 124-energy converter, 131-water pumping pump body, 1031-blocking ring, 1032-water pumping small hole, 1061-upper blocking cylinder, 1062-lower floating cylinder, 1063-connection rod, 1061-upper blocking cylinder, 1062-lower floating cylinder, 1063-connection rod, 10311-blocking ring body, 10312-touching section, 10313-fixing buckle. DETAILED DESCRIPTION

[0037] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0038] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it is to be understood that when an element such as a layer, region or substrate is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] The application will be described in detail below with reference to the attached drawings.

[0041] As shown in the drawings, Figures 1-9 A high-pressure wellhead two-stage serial self-charging energy pumping sand remover of the present application comprises a first-stage sand remover and a second-stage sand remover, the first-stage sand remover comprises a first-stage separator 1 and a first-stage sand accumulation cylinder 2, and the second-stage sand remover comprises a second-stage separator 3 and a second-stage sand accumulation cylinder 4.

[0042] The first-stage separator 1 and the first-stage sand accumulation cylinder 2 are connected through a gas-sand cutoff valve 5, and the second-stage separator 3 and the second-stage sand accumulation cylinder 4 are connected through a gas-sand cutoff valve 5.

[0043] An inlet pipeline 6 is connected to the first-stage separator 1, and an outlet pipeline 7 is connected to the second-stage separator 3. The first-stage separator 1 and the second-stage separator 3 are connected through a connecting pipeline 8. The connecting pipeline 8 is parallel to the axes of the inlet pipeline 6 and the outlet pipeline 7 but not collinear with them.

[0044] As shown in the drawings, Figure 2 A first-stage pumping pipe 10 is arranged in the inner cavity of the first-stage separator 1, and a second-stage pumping pipe 11 is arranged at the bottom of the inner cavity of the second-stage separator 3. The first-stage pumping pipe 10 and the second-stage pumping pipe 11 are in communication and neither of them extends into the valve plate of the gas-sand cutoff valve 5. The first-stage pumping pipe 10 passes through the connecting pipeline 8 and is connected to the second-stage pumping pipe 11.

[0045] The first-stage pumping pipe 10 and the second-stage pumping pipe 11 converge to a self-charging element 12 and an energy storage electric device 13 arranged in the second-stage separator 3. The energy storage electric device 13 can pump out the liquid in the first-stage sand remover and the second-stage sand remover.

[0046] As shown in the drawings, Figure 5As shown, the self-charging element 12 is arranged between the contact surface of the secondary separator 3 and the outlet pipeline 7, and specifically, the self-charging element 12 is embedded in the outlet pipeline 7.

[0047] The end of the primary water pumping pipe 10 and the secondary water pumping pipe 11 close to the self-charging element 12 is provided with a water pumping body 131. The energy storage motor 13 includes an energy storage device and a motor, the energy storage device is a battery for storing electric energy, and the motor is connected to the water pumping body 131 for driving the water pumping body 131. The energy storage device is arranged in the upper part of the cavity of the secondary separator 3, which can not hinder the flow of natural gas. The motor is connected to the self-charging element 12, which is a hollow rotary body structure, and the inside of the self-charging element 12 is provided with a reduced diameter section, which is a charging flow channel 122.

[0048] The end of the charging flow channel 122 is provided with an energy converter 124 with a spiral blade structure, which can be rotated by the impact of natural gas and generate induced electric energy, which is transmitted to the energy storage device for energy storage. The wall of the self-charging element 12 is provided with a water suction flow channel 123 connected from the water pumping body 131 to the outlet pipeline 7, which can directly send the pumped water into the outlet pipeline 7 for discharge.

[0049] As shown in Figure 4 The secondary water pumping pipe 11 is directly bent downward from the vicinity of the water pumping body 131 and extends below the secondary separator 3, and a plurality of small holes are arranged on the side of the end of the secondary water pumping pipe 11.

[0050] The opening of the connecting pipeline 8 close to the secondary separator 3 is provided with an adapter fixing ring 105. The primary water pumping pipe 10 includes a pipe section one 101, a pipe section two 102, and a pipe section three 103, one end of the pipe section one 101 is connected to the water pumping body 131, and the other end is connected with the adapter fixing ring 105, an internal liquid channel of the primary water pumping pipe 10 is arranged in the adapter fixing ring 105, the other end of the internal liquid channel is connected to the pipe section two 102, and the pipe section two 102 is connected to the pipe section three 103 through a connecting head 104.

[0051] As shown in Figure 6 , 7As shown, the pipe segment three 103 is vertically arranged in the primary separator 1 and extends to the bottom of the primary separator 1, and a plurality of water extraction holes 1032 are arranged at the bottom of the primary water extraction pipe 10. A cleaning trigger mechanism 106 is arranged in the pipe segment three 103, the cleaning trigger mechanism 106 includes a blocking ring 1031, an upper blocking cylinder 1061, a lower floating cylinder 1062, and a connecting rod 1063, and a threaded segment is arranged on the water extraction hole 1032 for fixing the blocking ring 1031. The blocking ring 1031 is sleeved upwards from the bottom of the pipe segment three 103 and fixed in the threaded segment on the water extraction hole 1032. The upper blocking cylinder 1061 and the lower floating cylinder 1062 are connected through the connecting rod 1063, and the diameter of the connecting rod 1063 is smaller than that of the fixing buckle 10313 but larger than the opening of the fixing buckle 10313.

[0052] The blocking ring 1031 includes a blocking ring body 10311, and a plurality of fixing buckles 10313 are arranged on both sides of the blocking ring body 10311, the fixing buckles 10313 are hollow circular arc-shaped notches with small inner openings and large outer openings, and a touch segment 10312 is arranged at the end of the threaded hole of the blocking ring 1031. An electric wire is connected inside the touch segment 10312 and connected to the motor through the primary water extraction pipe 10, and the electric wire is arranged on the inner wall of the primary water extraction pipe 10 or in the wall through hole of the primary water extraction pipe 10. When the touch segment 10312 is contacted by the lower floating cylinder 1062, the pressure-sensitive sensing sheet on the touch segment 10312 is triggered, and then the motor is started to perform water extraction operation in the primary desander. The touch segment 10312 is close to the inner side of the blocking ring body 10311 and is not easy to be accidentally touched by sand particles and the like. The touch segment 10312 is made of alloy material, which can not only ensure the rigidity and deformation recovery of the touch segment, but also has good corrosion resistance.

[0053] The upper blocking cylinder 1061 and the lower floating cylinder 1062 are arranged on the upper and lower sides of the blocking ring 1031 respectively, the cleaning trigger mechanism 106 and the blocking ring 1031 are connected together when the blocking ring 1031 is installed, and then they are sleeved from the bottom of the primary water extraction pipe 10 and installed on the threaded segment of the primary water extraction pipe 10 through the threaded fixing sleeve of the blocking ring 1031. If damaged, it is also convenient to separately disassemble and replace during the disassembly and repair of the complete desander. The connecting rod 1063 is slightly deformed and clamped into the fixing buckle 10313.

[0054] As shown in the drawings, Figure 7 The adapter fixing ring 105 is connected with two identical primary water extraction pipes 10. The primary water extraction pipe 10 includes a first primary water extraction pipe and a second primary water extraction pipe, and the length of the pipe segment three 103 of the first primary water extraction pipe is smaller than that of the second primary water extraction pipe. The bottom end of the second primary water extraction pipe is higher than that of the first primary water extraction pipe.

[0055] The cleaning trigger mechanism 106 of the first primary pumping pipe and the second primary pumping pipe has a certain height difference, which can ensure that the water pumping time of the first primary pumping pipe and the second primary pumping pipe is inconsistent, so that when the water height is relatively low, the energy consumption of water pumping can be reduced, when the water height is relatively high, the water pumping can be increased, and the cleaning positions are different, so that when the sand height is too high, the first primary pumping pipe below is accidentally blocked, and the second primary pumping pipe can still work normally.

[0056] The upper blocking cylinder 1061 and the lower floating cylinder 1062 are plastic parts with a density less than water, and the top of the upper blocking cylinder 1061 is provided with a tapered section, and the inside of the lower floating cylinder 1062 is provided with a sponge layer which can contact the outer wall of the pipe section 103. The upper blocking cylinder 1061 and the lower floating cylinder 1062 can cooperate to move axially on the blocking ring 1031 and be relatively fixed, and also provide buoyancy, and the tapered top of the upper blocking cylinder 1061 can block the sand particles falling from above, avoiding that the upper blocking cylinder 1061 is difficult to move upward due to too many sand particles accumulated on the top.

[0057] The primary pumping pipe 10 includes two parallel structures, which are respectively the primary pumping pipe 10 one and the primary pumping pipe 10 two. Since the primary separator 1 is the main separator, more water is generated inside, so two parallel primary pumping pipes 10 are arranged here to better meet the water pumping demand.

[0058] A water pumping working method of a high-pressure wellhead two-stage serial self-energy charging water pumping and sand removing device, comprising the following steps:

[0059] S1: Natural gas with sand particles and water rushes into the primary sand removing device, most of the sand particles fall downward and fall into the primary sand accumulation cylinder 2, and part of the water is also stored inside. At this time, the natural gas with the remaining water and sand particles enters the secondary sand removing device 3 from the connecting pipeline 8, and part of the sand particles and water also fall in the secondary sand removing device 3. At this time, the energy converter 124 generates electricity driven by the gas, and stores in the energy storage device. When the energy storage device is full, the charging stops.

[0060] S2: When there is more water in the primary sand removing device, if the lower floating cylinder 1062 is contacted, the entire cleaning trigger mechanism 106 is driven to move upward, touches the touch section 10312, starts the water pump body 131 to form a vacuum area in the primary pumping pipe 10 and the secondary pumping pipe 11, drives the gas to be pumped away and further pumps water, and sends the water away through the outlet pipeline 7.

[0061] S3: the device stops the water pump body 131 after completing the set time and ensuring that the touch section 10312 is not in contact with the cleaning trigger mechanism 106, the cleaning trigger mechanism 106 falls under the action of gravity, and cleans the water hole 1032 by wiping with the sponge, and limits the cleaning trigger mechanism 106 by the blocking ring 1031. Optionally, the set water pumping time is 3 minutes.

[0062] In the above embodiments, the device elements involved are all conventional device elements unless otherwise specified, and the structure setting mode, working mode or control mode involved are all conventional setting mode, working mode or control mode unless otherwise specified.

[0063] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit it, and other modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application as long as they do not deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A high-pressure wellhead two-stage series self-charging pumping desander, characterized in that: include: A first-stage desander and a second-stage desander, wherein the first-stage desander comprises a first-stage separator (1) and a first-stage sand accumulation cylinder (2), and the second-stage desander comprises a second-stage separator (3) and a second-stage sand accumulation cylinder (4); the first-stage separator (1) is connected to the first-stage sand accumulation cylinder (2) via an air sand shut-off valve (5); the second-stage separator (3) is connected to the second-stage sand accumulation cylinder (4) via an air sand shut-off valve (5); A connecting pipeline (8), wherein both ends of the connecting pipeline (8) are respectively connected to the first-stage separator (1) and the second-stage separator (3); The first-stage separator (1) is provided with a first-stage water pumping pipe (10) in the inner cavity, and a second-stage water pumping pipe (11) is provided at the bottom of the inner cavity of the second-stage separator (3), and the first-stage water pumping pipe (10) is connected to the second-stage water pumping pipe (11); an energy storage electric device (13) is provided in the second-stage separator (3), and a self-charging element (12) is provided in the second-stage separator (3), and the self-charging element (12) is provided at the outlet of the second-stage separator (3); the first-stage water pumping pipe (10) is connected to the second-stage water pumping pipe (11); or a water pump body (131) is provided at the end of the secondary water pumping pipe (11); the energy storage motor (13) comprises an electric motor and an energy storage device, the electric motor is connected to the water pump body (131); the energy storage device is provided in the cavity of the secondary separator (3), and the energy storage device is connected to the self-charging element (12); an energy converter (124) is provided inside the self-charging element (12); a cleaning trigger mechanism (106) is provided in the primary water pumping pipe (10), and the cleaning trigger mechanism (10 6) comprising a retaining ring (1031) and a retaining cylinder assembly; a small water pumping hole (1032) is provided at the bottom of the first-stage water pumping pipe (10); the retaining ring (1031) is fixed on the small water pumping hole (1032); the retaining cylinder assembly is movably sleeved on one end of the first-stage water pumping pipe (10) close to the bottom of the first-stage separator (1); a tactile segment (10312) is provided at the end of the retaining ring (1031) close to the retaining cylinder assembly, and the tactile segment (10312) is connected to the motor; the retaining cylinder assembly comprises An upper retaining cylinder (1061), a lower buoy (1062) and a connecting rod (1063) are provided. The upper retaining cylinder (1061) and the lower buoy (1062) are respectively arranged on the upper and lower sides of the retaining ring (1031). The upper retaining cylinder (1061) and the lower buoy (1062) are connected via the connecting rod (1063). When the touch segment (10312) is contacted by the lower buoy (1062), the pressure-sensitive sheet on the touch segment (10312) is triggered, thereby starting the motor to pump water from the first-stage desander.

2. A high-pressure wellhead two-stage series self-charging pumping desander according to claim 1, characterized in that: Neither the primary water pumping pipe (10) nor the secondary water pumping pipe (11) extends into the valve plate of the gas sand cut-off valve (5).

3. A high-pressure wellhead two-stage series self-charging pumping desander according to claim 1, characterized in that: The first-stage separator (1) is connected to an inlet pipeline (6), the second-stage separator (3) is connected to an outlet pipeline (7), and the self-charging element (12) is arranged between the contact surfaces of the second-stage separator (3) and the outlet pipeline (7).

4. A high-pressure wellhead two-stage series self-charging pumping desander according to claim 1, characterized in that: The self-charging element (12) is a hollow rotating body structure, a reduced diameter section is provided inside the self-charging element (12), and the energy converter (124) is arranged at the end of the reduced diameter section.

5. A high-pressure wellhead two-stage series self-charging pumping desander according to claim 1, characterized in that: The energy converter (124) is a spiral blade structure.

6. A high-pressure wellhead two-stage series self-charging pumping desander according to claim 1, characterized in that: A water suction channel (123) connected from the water pump body (131) to the outlet pipeline (7) is provided in the wall of the self-charging element (12).

7. A high-pressure wellhead two-stage series self-charged pumping desander according to claim 1, characterized in that: The retaining ring (1031) comprises a retaining ring body (10311), and a plurality of fixing buckles (10313) are provided on both sides of the retaining ring body (10311). The fixing buckles (10313) are hollow arc-shaped notches with outer openings smaller than inner openings.

8. The high-pressure wellhead two-stage series self-charging pumping desander according to claim 1 is characterized in that: The end side of the secondary water pumping pipe (11) is provided with multiple rows of small holes.

9. The operating method of a high-pressure wellhead two-stage series self-charging pumping desander according to any one of claims 1 to 8, characterized in that: The steps include: S1: The natural gas, along with sand and water, is flushed into the first-stage desander and enters the second-stage desander through the connecting pipeline (8). The gas drives the energy converter (124) to generate electricity, which is then stored in the energy storage device. S2: When the water level in the first-stage desander contacts the retaining cylinder assembly, the entire cleaning trigger mechanism (106) moves upward, touches the touch section (10312), and activates the pumping pump body (131) to form a vacuum area in the first-stage pumping pipe (10) and the second-stage pumping pipe (11), thereby driving the gas and water to be pumped away; S3: After ensuring that the touch section (10312) does not contact the cleaning trigger mechanism (106), the water pump body (131) stops, the cleaning trigger mechanism (106) falls, and the cleaning trigger mechanism (106) is limited by the retaining ring (1031).

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