Device for measuring influence of nozzle on exploitation of natural gas hydrate in sea area

Abstract

The invention belongs to the technical field of measurement, and discloses a device for measuring the influence of a nozzle on marine natural gas hydrate exploitation, a seawater storage tank is sequentially connected with a water pump, a fluid flowmeter, a first ball valve, a pressure gauge and an inlet, and an outlet is sequentially connected with a second ball valve, a third ball valve, a separator, a fifth ball valve and the seawater storage tank to form a loop; the first pressure sensor, the second pressure sensor and the electric control knob are connected with the monitoring system; a nozzle inlet is connected with the right end of the horizontal section, and the horizontal section, a rock block, a nylon layer, a nozzle and a supporting rod are arranged in the rectangular box body. A circulation loop is formed by exploiting the natural gas hydrate through seawater injection, the exploiting operation process under the actual working condition can be truly simulated, seawater can be recycled, measurement resources can be recycled, and the measurement result can provide specific guiding significance for on-site operation.

Description

Technical Field

[0001] The invention belongs to the field of measurement technology, and in particular, is a device for measuring the influence of nozzles on the exploitation of natural gas hydrate in sea areas. Background Art

[0002] The use of water jet crushing mining to mine seabed natural gas hydrates is a natural gas hydrate mining method proposed in recent years. The principle is to use the jet generated by the nozzle to break up the seabed hydrate reservoir, and then mine the solid natural gas hydrate. This mining method does not require changing the temperature and pressure conditions of the reservoir, and can greatly improve the safety of mining the reservoir. In order to improve the effect of the jet, predecessors have conducted research on the nozzle, a key component of water jet crushing mining, in an attempt to find a more efficient nozzle to improve mining efficiency. Due to the change in water flow velocity, when the water flows through the nozzle, over time, the water flow will erode the inner wall of the nozzle, affecting the service life of the nozzle. Although the commonly used nozzles are angle nozzles, Helmholtz nozzles, and conical nozzles, due to the fixed inner diameter of these three nozzles during the actual use on site, the inlet pressure and outlet pressure are fixed under a certain flow rate, so the impact on the water jet effect is fixed, which cannot meet the needs of the actual mining process. Therefore, when using the water jet crushing mining method to exploit seabed natural gas hydrates, it is necessary to design a new nozzle and measure its impact on the exploitation of natural gas hydrates in the sea area. This can not only achieve the improvement of the mining efficiency by changing the jet flow rate according to different working conditions according to actual needs, but also provide a reference for the application of water jets in the field of natural gas hydrate exploitation. Summary of the invention

[0003] The purpose of the present invention is to provide a device for measuring the influence of nozzles on the exploitation of natural gas hydrates in sea areas, which is used to measure the influence of different nozzles on the exploitation of natural gas hydrates in sea areas.

[0004] The present invention is achieved through the following technical solutions:

[0005] A device for measuring the influence of a nozzle on the exploitation of natural gas hydrate in the sea area, the measuring device comprises a seawater storage tank, a water pump, a liquid flow meter, a first ball valve, a pressure gauge, an inlet, a first pressure sensor, a vertical section, a curved section, a second pressure sensor, a horizontal section, a nozzle, a second ball valve, an outlet, a support rod, a third ball valve, a separator, a separator inlet, a vent valve, a separator right outlet, a separator bottom outlet, a fourth ball valve, a collecting bucket, a fifth ball valve, a rock block, a nylon layer, a rectangular box, a monitoring system, an electric control knob, an inclined plate, a nozzle outlet, a nozzle inlet, and an arc buffer; the seawater storage tank is connected with the water pump, the liquid flow meter, the first ball valve, the pressure gauge, and the inlet in sequence, and the outlet is connected with the second ball valve, the third ball valve, the separator, the fifth ball valve, and the seawater storage tank in sequence to form a loop; the first pressure sensor, the second pressure sensor, and the electric control knob are connected with the monitoring system; the nozzle inlet is connected with the right end of the horizontal section, and the rectangular box is provided with a horizontal section, a rock block, a nylon layer, a nozzle, and a support rod.

[0006] A curved section is arranged between the vertical section and the horizontal section, and the curved section is arranged by a hose.

[0007] One end of the curved section is connected to the vertical section, and the other end is connected to the horizontal section.

[0008] The horizontal section is located in the middle of the rectangular box body, and two support rods are arranged at the bottom of the horizontal section. One end of the support rod is welded and fixed to the horizontal section, and the other end is welded and fixed to the rectangular box body.

[0009] The first pressure sensor is located at the upper right part of the vertical segment, and the second pressure sensor is located at the one-sixth point of the upper left part of the horizontal segment. Their functions are to monitor the pressure in the vertical segment and the horizontal segment respectively.

[0010] The nozzle comprises an electric control knob, an inclined plate, a nozzle outlet and a nozzle inlet.

[0011] Two electric control knobs and an inclined plate are arranged in the nozzle, and are located at two-fifths of the right side of the nozzle.

[0012] The two electric control knobs and the inclined plate are symmetrically arranged.

[0013] The electric control knob and the inclined plate are fixed by welding.

[0014] As described above, the monitoring system controls the two electric control knobs to move inward or outward, which belongs to the prior art and will not be described in detail here.

[0015] The middle part of the nozzle is horizontal or arc-shaped.

[0016] The diameter of the nozzle inlet is 1.5 times that of the nozzle outlet.

[0017] The seawater storage tank is filled with seawater, which belongs to the prior art and will not be described in detail here.

[0018] The first ball valve, the second ball valve, the third ball valve, the fourth ball valve and the fifth ball valve are identical ball valves and belong to the prior art, and will not be described in detail herein.

[0019] The pressure gauge, separator, liquid flow meter and water pump belong to the prior art and will not be described in detail here.

[0020] The nylon layer includes nylon particles with a diameter of 0.5 mm, which belongs to the prior art and will not be described in detail here.

[0021] There are two types of nozzle middle parts in the measuring device, one is a straight section and the other is an arc section.

[0022] The seawater enters from the nozzle inlet of the nozzle and flows out from the nozzle outlet; the monitoring system controls the two electric control knobs on the nozzle to move inward or outward, and the inclined plate moves inward or outward during the movement, thereby changing the cross-sectional area through which the seawater jets from the nozzle, thereby improving the efficiency of natural gas hydrate extraction in the sea area.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] (1) The present invention has strong logic and accurate measurement. It can not only simulate the mining process under actual working conditions, but also recycle seawater and allow measurement resources to be reused in a circular manner.

[0025] (2) The present invention sets a monitoring system to control the electric control knob to move inward or outward. At the same time, the inclined plate also moves inward or outward, thereby changing the cross-sectional area through which the seawater jets from the nozzle, thereby changing the seawater flow rate, thereby improving the efficiency of natural gas hydrate extraction in the sea area.

[0026] (3) The present invention sets two different types of nozzles, a straight section and an arc section, for measurement, and can obtain the maximum flow rate achieved when the electric control knobs on different nozzles are adjusted and the influence on natural gas hydrate production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a flow chart of a device for measuring the influence of nozzles on the exploitation of natural gas hydrates in the sea area.

[0028] Figure 2 It is a structural schematic diagram of the initial position of the electric control knob in the first embodiment of the nozzle of the present invention.

[0029] Figure 3 for Figure 2 Schematic diagram of the structure in which the middle power transmission control knob extends inward.

[0030] Figure 4It is a structural schematic diagram of the initial position of the electric control knob in the second embodiment of the nozzle of the present invention.

[0031] Figure 5 for Figure 4 Schematic diagram of the structure in which the middle power transmission control knob extends inward.

[0032] Among them, 1 is a seawater storage tank, 2 is a water pump, 3 is a liquid flow meter, 4 is a first ball valve, 5 is a pressure gauge, 6 is an inlet, 7 is a first pressure sensor, 8 is a vertical section, 9 is a curved section, 10 is a second pressure sensor, 11 is a horizontal section, 12 is a nozzle, 13 is a second ball valve, 14 is an outlet, 15 is a support rod, 16 is a third ball valve, 17 is a separator, 18 is a separator inlet, 19 is a vent valve, 20 is a separator right outlet, 21 is a separator bottom outlet, 22 is a fourth ball valve, 23 is a collection bucket, 24 is a fifth ball valve, 25 is a rock block, 26 is a nylon layer, 27 is a rectangular box, 28 is a monitoring system, 29 is an electric control knob, 30 is an inclined plate, 31 is a nozzle outlet, 32 is a nozzle inlet, and 33 is an arc buffer. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0034] like Figure 1-Figure 5 As shown, a device for measuring the influence of nozzles on the exploitation of natural gas hydrate in the sea area includes a seawater storage tank 1, a water pump 2, a liquid flow meter 3, a first ball valve 4, a pressure gauge 5, an inlet 6, a first pressure sensor 7, a vertical section 8, a curved section 9, a second pressure sensor 10, a horizontal section 11, a nozzle 12, a second ball valve 13, an outlet 14, a support rod 15, a third ball valve 16, a separator 17, a separator inlet 18, a vent valve 19, a separator right outlet 20, a separator bottom outlet 21, a fourth ball valve 22, a collecting bucket 23, a fifth ball valve 24, a rock block 25, a nylon layer 26, a rectangular box 27, a monitoring system The monitoring system 28, the electric control knob 29, the inclined plate 30, the nozzle outlet 31, the nozzle inlet 32, and the arc buffer 33; the seawater storage tank 1 is connected with the water pump 2, the liquid flow meter 3, the first ball valve 4, the pressure gauge 5, and the inlet 6 in sequence, and the outlet 14 is connected with the second ball valve 13, the third ball valve 16, the separator 17, the fifth ball valve 24, and the seawater storage tank 1 to form a loop; the first pressure sensor 7, the second pressure sensor 10, and the electric control knob 29 are connected with the monitoring system 28; the nozzle inlet 32 ​​is connected with the right end of the horizontal section 11, and the rectangular box 27 is provided with the horizontal section 11, the rock block 25, the nylon layer 26, the nozzle 12, and the support rod 15.

[0035] The monitoring system 28 controls the two electric control knobs 29 on the nozzle 12 to move inward or outward, and at the same time, the inclined plate 30 moves inward or outward, thereby changing the cross-sectional area through which the seawater jets from the nozzle, and ultimately improving the efficiency of natural gas hydrate extraction in the sea area.

[0036] Embodiment 1

[0037] When measuring the effect of the horizontal condition in the middle of the nozzle on the exploitation of natural gas hydrate in the sea area, first close all ball valves, open the seawater storage tank 1, water pump 2, first ball valve 4, second ball valve 13, third ball valve 16, and fifth ball valve 24 in sequence, the seawater in the seawater storage tank 1 is pressurized by the water pump 2, and after being measured by the liquid flow meter 3, the seawater enters the vertical section 8 from the inlet 6, and the seawater flows from top to bottom in the vertical section 8 to the curved section 9. After passing through the curved section 9, the flow direction of the seawater changes, and after flowing to the horizontal section 11, it flows into the nozzle 12 from the right side of the horizontal section 11. The seawater enters from the nozzle inlet 32 ​​and is ejected from the nozzle outlet 31. The two electric control knobs 29 in the nozzle 12 are controlled to move downward by the monitoring system 28. During the movement, since the electric control knob 29 is fixed to the inclined plate 30 by welding, the inclined plate 30 also moves downward during the downward movement of the electric control knob 29.

[0038] According to the measurement requirements, the movement distance of the electric control knob 29 is adjusted by the monitoring system 28. When the electric control knob 29 and the inclined plate 30 move together to Figure 3 The maximum measuring point is when the seawater is ejected from the nozzle outlet 31 (i.e., it moves downward to the maximum distance), and the ejection speed at this time reaches the maximum. After the seawater is ejected from the nozzle outlet 31, it is ejected to the nylon layer 26, and the nylon particles in the nylon layer 26 are ejected to the bottom of the rectangular box 27. The ejection time is 2 minutes. The mixture of seawater and nylon particles finally flows out from the outlet 14 to the separator 17 for separation. The separated seawater flows into the seawater storage tank 1 for recycling, and the separated nylon particles enter the collection bucket 23 for drying and weighing and recording.

[0039] The entire measurement process is achieved by adjusting the different movement distances of the electric control knob 29 by the monitoring system 28. The movement distance is controlled for measurement according to actual needs, and the final weight of the nylon particles collected by the collection bucket 23 is used as the standard.

[0040] Embodiment 2

[0041] When measuring the effect of the arc condition in the middle of the nozzle on the exploitation of natural gas hydrate in the sea area, the measurement steps are the same as those in the above-mentioned embodiment 1, and will not be repeated here. The only difference between this embodiment and embodiment 1 is that a different nozzle 12 is used, the middle of the nozzle is an arc segment, and there is a buffer zone at the arc, the purpose of which is to prevent the injection speed from being too fast and to facilitate the control of the flow rate change. Finally, the weight of the nylon particles collected in the collection bucket 23 is measured.

[0042] The present invention forms a circulation loop by setting up seawater jetting to exploit natural gas hydrates, which can truly simulate the operation process of exploitation under actual working conditions, and can recycle seawater so as to recycle measurement resources. Two nozzles are set to measure the influence of different nozzles on the exploitation of natural gas hydrates in the sea area, and the measurement results will provide specific guidance for on-site operations.

Claims

1. A device for measuring the effect of nozzles on the exploitation of natural gas hydrates in the sea, characterized by: It comprises a seawater storage tank (1), a water pump (2), a liquid flow meter (3), a first ball valve (4), a pressure gauge (5), an inlet (6), a first pressure sensor (7), a vertical section (8), a curved section (9), a second pressure sensor (10), a horizontal section (11), a nozzle (12), a second ball valve (13), an outlet (14), a support rod (15), a third ball valve (16), a separator (17), a separator inlet (18), a vent valve (19), a separator right outlet (20), a separator bottom outlet (21), a fourth ball valve (22), a collecting barrel (23), a fifth ball valve (24), a rock block (25), a nylon layer (26), a rectangular box (27), a monitoring system (28), an electric control knob (29), a ramp (30), a nozzle outlet (31), a nozzle inlet (32), and an arc buffer (33); The seawater storage tank (1) is sequentially connected to a water pump (2), a liquid flow meter (3), a first ball valve (4), a pressure gauge (5), and an inlet (6); the outlet (14) is sequentially connected to a second ball valve (13), a third ball valve (16), a separator (17), a fifth ball valve (24), and a seawater storage tank (1) to form a loop; the first pressure sensor (7), the second pressure sensor (10), and the electric control knob (29) are connected to a monitoring system (28); the nozzle inlet (32) is connected to the right end of the horizontal section (11); and the rectangular box (27) is provided with a horizontal section (11), a rock block (25), a nylon layer (26), a nozzle (12), and a support rod (15).

2. The measuring device according to claim 1, characterized in that: A curved section (9) is provided between the vertical section (8) and the horizontal section (11), and the curved section (9) is provided by a hose.

3. The measuring device according to claim 1, characterized in that: The horizontal section (11) is located in the middle of the rectangular box (27). Two support rods (15) are provided at the bottom of the horizontal section (11). One end of the support rod (15) is welded and fixed to the horizontal section (11), and the other end is welded and fixed to the rectangular box (27).

4. The measuring device according to claim 3, characterized in that: The first pressure sensor (7) is located at the upper right part of the vertical section (8), and the second pressure sensor (10) is located at the one-sixth point of the upper left part of the horizontal section (11).

5. The measuring device according to claim 1, characterized in that: Two electric control knobs (29) and an inclined plate (30) are provided in the nozzle (12), and are located at two-fifths of the right side of the nozzle (12).

6. The measuring device according to claim 1, characterized in that: The electric control knob (29) and the inclined plate (30) are fixed by welding.

7. The measuring device according to claim 1, characterized in that: The middle part of the nozzle (12) is horizontal or arc-shaped.

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