Supersonic shock wave hole atomization drainage gas recovery device

Abstract

The invention relates to the technical field of natural gas extraction, in particular to a supersonic shock wave hole atomization drainage gas production device, and aims at solving the problems that in the prior art, a throttler is poor in atomization efficiency and low in drainage gas production efficiency. The device comprises a connector and further comprises an atomization device. The atomization device comprises a central pipe and a nozzle; two ends of the central pipe are communicated to form a diversion channel; the flow guide channel is provided with an inlet end and an outlet end; the connector sleeves the inlet end; the nozzle is fixedly connected with the outlet end through the nozzle connector; a groove is formed in the inner wall, close to the inlet end, of the flow guide channel, when airflow flows into the groove, shock wave turbulent flow can be generated, so that a gas-liquid mixture in natural gas can be preliminarily sheared and broken in the groove and then is sprayed out of the nozzle, the supersonic shock wave hole atomization drainage gas production device can have higher atomization efficiency, and the atomization effect is better. And the natural gas drainage gas recovery efficiency is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas production, and in particular to a supersonic shock wave hole atomization drainage gas production device. Background Art

[0002] During the natural gas extraction process, the bottom hole pressure and natural gas flow rate gradually decrease with the extraction time, so that the produced water or condensate in the gas reservoir cannot be discharged with the gas flow, forming the phenomenon of "gas well liquid accumulation", which affects the efficiency and output of natural gas extraction, and in severe cases leads to the shutdown of gas wells. Therefore, it is necessary to develop new methods and technologies for water drainage and gas extraction with high reliability, good efficiency and strong economy.

[0003] At present, there are three main methods for drainage and gas production for bottom hole liquid accumulation, namely pneumatic method, mechanical method and physical and chemical method. Among them, the bottom hole throttle is a pneumatic drainage and gas production device, which uses pneumatic acceleration to increase the flow rate and kinetic energy of natural gas at the bottom of the well, and is used to overcome the insufficient carrying capacity of the gas-liquid two-phase flow working medium due to low flow rate.

[0004] The more advanced throttle drainage and gas production devices in the prior art achieve supersonic acceleration through supersonic gas nozzles and airflow, and can supersonic atomize the accumulated liquid in the gas well, thereby improving the drainage and gas production efficiency. However, the efficiency of supersonic acceleration and atomization of the accumulated liquid only through supersonic gas nozzles and airflow is poor, and the drainage and gas production efficiency is low. Summary of the invention

[0005] The invention provides a supersonic shock wave hole atomization drainage and gas collection device to solve the problems of poor atomization efficiency of the throttle and low drainage and gas collection efficiency in the prior art.

[0006] In order to alleviate the above technical problems, the technical solution provided by the present invention is:

[0007] A supersonic shock wave hole atomization drainage and gas collection device comprises a connector and an atomization device; the atomization device comprises a central tube and a nozzle; two ends of the central tube are connected to form a flow guide; the flow guide is provided with an inlet end and an outlet end; the connector is sleeved on the inlet end; the nozzle is fixedly connected to the outlet end through the nozzle connector; a groove is provided on the inner wall of the flow guide near the inlet end.

[0008] Furthermore, the groove is a concave hole arranged on the inner wall of the central tube and recessed in a direction away from the center; a plurality of grooves are arranged axially along the inner wall of the central tube.

[0009] Furthermore, the bottom wall of the groove is also provided with a recessed portion recessed in a direction away from the flow guide channel; the recessed portion is smoothly transitionally connected to the bottom wall of the groove.

[0010] Furthermore, the distance between the groove and the inlet of the central tube is recorded as L1, and L1 ≥ 40 mm.

[0011] Furthermore, the distance between two adjacent grooves is recorded as L2, and L2≤2mm.

[0012] Furthermore, the diameter of the groove is denoted as R, and R≥3 mm.

[0013] Furthermore, it also includes an annular sealing ring; the annular sealing ring is sleeved with the outer wall of the central tube.

[0014] Furthermore, it also includes a fixing ring; the fixing ring is fixedly connected to the outer wall of the central tube through slips.

[0015] Furthermore, a supporting tube and a guide sleeve are also provided on the outer wall of the central tube; the supporting tube is sleeved with the outer wall of the nozzle connector through a telescopic sleeve; the supporting tube is connected with the guide sleeve through an adjusting nut; and the guide sleeve is sleeved with the outer wall of the central tube.

[0016] Furthermore, the central tube is also provided with a pull rod; the pull rod is plugged into the nozzle and extends to contact the inner wall of the nozzle connector.

[0017] Based on the above technical solutions, the technical effects that can be achieved by the present invention are analyzed as follows:

[0018] The present embodiment provides a supersonic shock wave hole atomization drainage and gas collection device including a connecting head and an atomization device; the atomization device includes a central tube and a nozzle; the two ends of the central tube are connected to form a guide channel; the guide channel is provided with an inlet end and an outlet end; the connecting head is sleeved on the inlet end; the nozzle is fixedly connected to the outlet end through the nozzle connecting head; a groove is provided on the inner wall of the guide channel near the inlet end.

[0019] When the supersonic shock wave hole atomization drainage and gas production device provided by the present invention is in use, the high-pressure and low-speed airflow at the bottom of the well enters from the inlet end of the central tube after being accelerated. Since the central tube is provided with a groove in the guide channel, when the airflow flows into the groove, shock wave turbulence will be generated, so that the gas-liquid mixture in the natural gas can be initially sheared and crushed in the groove, and then sprayed out from the nozzle, so that the supersonic shock wave hole atomization drainage and gas production device can have a higher atomization efficiency and further improve the drainage and gas production efficiency of natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a front view schematic diagram of the present invention;

[0022] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0023] Figure 3 is a cross-sectional schematic diagram of the central tube;

[0024] Figure 4 for Figure 3 A is a partial enlarged schematic diagram;

[0025] Figure 5 A schematic cross-sectional view of a groove.

[0026] icon:

[0027] 100-connector;

[0028] 200-atomizing device; 210-central tube; 211-flow guide channel; 212-inlet end; 213-outlet end; 214-supporting tube; 215-guide sleeve; 216-adjusting nut; 218-pull rod; 219-telescopic sleeve; 220-nozzle; 221-nozzle connector; 230-groove; 231-recessed portion;

[0029] 300- annular sealing ring;

[0030] 400-fixing ring; 410-slip. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment 1

[0035] In the process of natural gas extraction, there is a phenomenon of "liquid accumulation in gas wells", which affects the efficiency and output of natural gas extraction. When using a throttle drainage and gas production device to solve the problem of "liquid accumulation in gas wells", there is a problem of low drainage and gas production efficiency.

[0036] In view of this, the present invention provides a supersonic shock wave hole atomization drainage and gas collection device including a connector 100 and an atomization device 200; the atomization device 200 includes a central tube 210 and a nozzle 220; the two ends of the central tube 210 are connected to form a guide channel 211; the guide channel 211 is provided with an inlet end 212 and an outlet end 213; the connector 100 is sleeved on the inlet end 212; the nozzle 220 is fixedly connected to the outlet end 213 through the nozzle connector 221; and a groove 230 is provided on the inner wall of the guide channel 211 near the inlet end 212.

[0037] When using the supersonic shock wave hole atomization drainage and gas production device provided by the present invention, the high-pressure low-pressure airflow at the bottom of the well enters the inlet end 212 of the central tube 210 through the connector 100 after being accelerated, and flows from the outlet end 213 to the nozzle 220, and is finally ejected from the nozzle 220; since the guide channel 211 of the central tube 210 is provided with a groove 230, shock wave turbulence is generated when the airflow passes through the groove 230, so that the gas-liquid mixture in the natural gas can be sheared and broken at the groove 230, thereby improving the efficiency of drainage and gas production.

[0038] The following will be combined with the attached Figure 1-5 The structure and shape of the supersonic shock wave hole atomization drainage and gas collection device provided in this embodiment are described in detail:

[0039] like Figure 1 , Figure 2 and Figure 3As shown, the supersonic shock wave hole atomization drainage and gas collection device provided in this embodiment includes a connector 100 and an atomization device 200; the atomization device 200 includes a central tube 210 and a nozzle 220; the two ends of the central tube 210 are connected to form a guide channel 211; the guide channel 211 is provided with an inlet end 212 and an outlet end 213; the connector 100 is sleeved on the inlet end 212; the nozzle 220 is fixedly connected to the outlet end 213 through the nozzle connector 221; and a groove 230 is provided on the inner wall of the guide channel 211 near the inlet end 212.

[0040] When performing drainage and gas production operations, the connector 100 will be connected to the bottom hole exhaust device, and the airflow accelerated by the bottom hole exhaust device enters from the connector 100 and is ejected from the nozzle 220 into the pipeline. In the optional scheme, it is more preferred that the surface of the device is coated with a corrosion-resistant coating to prevent acidic gas from corroding the device, and the coating can also reduce the friction resistance of the pipeline to the airflow, further increasing the speed of the airflow.

[0041] Regarding the structure and shape of the groove 230, as shown in FIG. Figure 3 As shown, the groove 230 is a concave hole provided on the inner wall of the central tube 210 and recessed in a direction away from the center; a plurality of grooves 230 are arranged axially along the inner wall of the central tube 210 .

[0042] When the airflow moves along the central tube 210 from the inlet end 212 to the outlet end 213 , the airflow near the inner wall of the central tube 210 can more fully enter the groove 230 to generate more shock wave turbulence, so that the gas-liquid mixture in the natural gas can be sheared and broken more fully.

[0043] In an optional solution of the present invention, it is more preferred to set the cross-sectional shape of the groove 230 to be circular to facilitate the processing and manufacturing of the groove 230. Of course, it can also be set to other shapes, such as square, triangle and other states.

[0044] Specifically, Figure 5 As shown, the bottom wall of the groove 230 is also provided with a recessed portion 231 that is recessed away from the flow guide channel 211; the recessed portion 231 is smoothly connected to the bottom wall of the groove 230. When the airflow enters the groove 230, it will further collide at the recessed portion 231, so that the airflow generates more shock wave turbulence at the groove 230.

[0045] In an optional solution of this embodiment, the distance between the groove 230 and the inlet of the central tube 210 is recorded as L1, and L1 ≥ 40 mm.

[0046] Specifically, Figure 4As shown, the distance between the groove 230 and the inlet end 212 is limited to at least 40 mm, so that when the airflow enters the central tube 210 from the inlet end 212, the airflow will initially stabilize and accelerate at the beginning of the guide channel 211, so that the initial speed of the airflow about to enter the groove 230 is relatively fast and stable.

[0047] In an optional solution of this embodiment, the distance between two adjacent grooves 230 is recorded as L2, and L2≤2mm.

[0048] Specifically, Figure 4 As shown, the distance between two adjacent grooves is limited to a maximum of 2 mm, which can ensure that the airflow has enough time to generate shock wave turbulence in the adjacent grooves.

[0049] In an optional solution of this embodiment, the cross-sectional diameter of the groove 230 is denoted as R, and R≥3 mm.

[0050] Specifically, Figure 4 As shown, the cross-sectional diameter of the groove 230 is limited to at least 3 mm, which can ensure that sufficient airflow enters the groove 230 and makes the airflow contact with the groove 230 more fully.

[0051] like Figure 1 As shown, the device further includes an annular sealing ring 300 ; the annular sealing ring 300 is sleeved with the outer wall of the central tube 210 .

[0052] The annular sealing ring 300 is supported by a material with certain elasticity and toughness. The annular sealing ring 300 includes a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are continuously arranged on the outer wall of the central tube 210; the annular sealing ring 300 has an annular groove on one side close to the outer wall of the central tube 210, and the outer diameter of the annular sealing ring 300 is slightly larger than the inner diameter of the bottom hole pipeline. In this way, it can be ensured that after the equipment enters the bottom hole, the annular sealing ring 300 can fully fit with the inner wall of the pipeline to improve the air tightness during exhaust.

[0053] like Figure 1 As shown, the device further includes a fixing ring 400 ; the fixing ring 400 is fixedly connected to the outer wall of the central pipe 210 via slips 410 .

[0054] The fixing ring 400 can be engaged with the corresponding slot of the bottom well pipeline to ensure that the device is installed in the correct position and fastened at the bottom well. Of course, other connection methods are also possible, such as flange connection, threaded connection, etc.

[0055] like Figure 1 , Figure 2As shown, the outer wall of the central tube 210 is also provided with a supporting tube 214 and a guide sleeve 215; the supporting tube 214 is sleeved with the outer wall of the nozzle connector 221 through a telescopic sleeve; the supporting tube 214 is connected to the guide sleeve 215 through an adjusting nut 216; and the guide sleeve 215 is sleeved with the outer wall of the central tube 210.

[0056] Since the device is often placed vertically in the bottom hole pipeline, and the surface of the bottom hole pipeline often has certain inclination or unevenness defects, the relative position between the guide sleeve 215 and the support tube 214 can be adjusted by adjusting the nut 216 to adjust the accuracy of the docking between the device and the gas acceleration device and the sealing performance of the annular sealing ring 300 and the bottom hole pipeline.

[0057] like Figure 1 As shown, the central tube 210 is further provided with a pull rod 218 ; the pull rod 218 is plugged into the nozzle 220 and extends to contact the inner wall of the nozzle connector 221 .

[0058] In the optional scheme of the present invention, it is more preferred that a shortening pin is also provided on the pull rod 218 and the nozzle 220, and the end of the pull rod 218 away from the nozzle 220 is connected to an external lifting device. When the installation of the present device is completed, the external lifting device can be separated from the present device by removing the shortening pin, and the pull rod 218 can be reused after being recovered.

[0059] The working principle of the present invention is:

[0060] When performing drainage and gas production operations, the high-pressure, low-speed airflow at the bottom of the well will be mixed with the liquid at the bottom of the well to form a gas-liquid mixture under the action of the bottom-hole exhaust device. After being accelerated, it enters the central pipe 210 through the connector 100. When the airflow passes through the groove 230, shock wave turbulence will be generated on the surface of the groove 230, so that the gas-liquid mixture in the natural gas can be initially sheared and crushed at the groove 230.

[0061] And the speed of the airflow will be continuously increased in the central tube 210. When the airflow is about to reach the nozzle 220, the airflow speed is increased to a critical state (i.e., the local sound speed). Since the cross-section of the nozzle 220 is reduced, the airflow expands, and the airflow is accelerated to a supersonic state. The supersonic airflow is continuously accelerated in the nozzle 220 and finally ejected from the nozzle. The gas-liquid mixture in the natural gas is carried and sheared by the supersonic airflow, and the particle size of the liquid phase working fluid is further sheared and broken, thereby realizing supersonic atomization. The atomized gas-liquid mixture is lifted to the wellhead through a pipeline and discharged, thereby finally achieving the purpose of water drainage and gas production.

[0062] The present invention can achieve the following beneficial effects:

[0063] The gas-liquid mixture entering the central tube 210 is preliminarily sheared and crushed by the groove 230, thereby improving the atomization efficiency of the device, enabling the gas per unit flow to carry more atomized liquid, and further improving the drainage and gas production efficiency of the device.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A supersonic shock wave hole atomization drainage and gas collection device, comprising a connector (100), characterized in that: Also included is an atomizing device (200); The atomizing device (200) comprises a central tube (210) and a nozzle (220); Both ends of the central tube (210) are connected to form a flow guide channel (211); The flow guide channel (211) is provided with an inlet end (212) and an outlet end (213); The connector (100) is sleeved on the inlet end (212); The nozzle (220) is fixedly connected to the outlet end (213) via a nozzle connector (221); The inner wall of the flow guide channel (211) is provided with a groove (230) close to the inlet end (212).

2. The supersonic shock wave hole atomization drainage and gas collection device according to claim 1 is characterized in that: The groove (230) is a concave hole provided on the inner wall of the central tube (210) and recessed in a direction away from the center; The plurality of grooves (230) are arranged axially along the inner wall of the central tube (210).

3. The supersonic shock wave hole atomization drainage and gas collection device according to claim 2 is characterized in that: The bottom wall of the groove (230) is also provided with a recessed portion (231) recessed in a direction away from the flow guide channel (211); The recessed portion (231) is smoothly transitionally connected to the bottom wall of the groove (230).

4. The supersonic shock wave hole atomization drainage and gas collection device according to claim 3 is characterized in that: The distance between the groove (230) and the inlet of the central tube (210) is denoted as L1, and L1 is ≥ 40 mm.

5. The supersonic shock wave hole atomization drainage and gas collection device according to claim 4 is characterized in that: The distance between two adjacent grooves (230) is recorded as L2, and L2≤2mm.

6. The supersonic shock wave hole atomization drainage and gas collection device according to claim 5 is characterized in that: The diameter of the groove (230) is denoted as R, and R≥3 mm.

7. The supersonic shock wave hole atomization drainage and gas collection device according to claim 6 is characterized in that: Also includes an annular sealing ring (300); The annular sealing ring (300) is sleeved with the outer wall of the central tube (210).

8. The supersonic shock wave hole atomization drainage and gas collection device according to claim 7 is characterized in that: Also includes a fixing ring (400); The fixing ring (400) is fixedly connected to the outer wall of the central tube (210) via slips (410).

9. The supersonic shock wave hole atomization drainage and gas collection device according to claim 8, characterized in that: The outer wall of the central tube (210) is also provided with a supporting cylinder (214) and a guide sleeve (215); The supporting tube (214) is sleeve-connected with the outer wall of the nozzle connecting head (221) via a telescopic sleeve; The supporting cylinder (214) is connected to the guide sleeve (215) via an adjusting nut (216); The guide sleeve (215) is sleeved with the outer wall of the central tube (210).

10. The supersonic shock wave hole atomization drainage and gas collection device according to claim 9, characterized in that: The central tube (210) is also provided with a pull rod (218); The pull rod (218) is plugged into the nozzle (220) and extends to contact the inner wall of the nozzle connector (221).

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