Venturi ejector device

Abstract

The invention discloses a venturi ejector device which comprises a pipe column short section, a detachable inner nozzle upper ring, a detachable inner nozzle lower ring and a detachable fixing head are sequentially arranged in the pipe column short section from top to bottom, a first copper pad is arranged on the end face of the top face of the inner nozzle upper ring, and a second copper pad is arranged on the end face of the top face of the inner nozzle lower ring. A second copper pad is arranged between the inner nozzle lower ring and the inner nozzle upper ring, and a third copper pad is arranged between the fixing head and the inner nozzle lower ring. The venturi ejector device can be driven by an existing gas source of a wellhead to a certain extent, extra power consumption is reduced, liquid and high-speed airflow meet at the throat and are wrapped by the airflow through the negative pressure effect and the suction effect in a low-pressure area of the throat, a gas-liquid two-phase mixture is formed, the accumulated liquid is effectively extracted and discharged, and therefore the gas-liquid two-phase mixture is formed. Normal production of the gas well is recovered and maintained, the natural gas recovery efficiency is improved, the service life of the gas well is prolonged, and the exploitation cost is reduced.

Description

Technical Field

[0001] The present invention relates to an oil and gas downhole device, more specifically, to a Venturi ejector device. Background Art

[0002] Increasing well productivity, extending well life, and optimizing resource utilization have always been core objectives in oil and gas production. During long-term production, due to declining formation pressure and geological factors, liquid accumulates within the reservoir, compressing the effective gas flow path and inhibiting the well's productivity, leading to a drop in production or even shutdown. To protect well productivity and prevent wells from prematurely entering a decline phase that impacts development cycles and recovery rates, timely drainage is crucial for production. Summary of the Invention

[0003] Based on this, it is necessary to provide a Venturi ejector device to address the above technical problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A Venturi ejector device, characterized in that the Venturi ejector device comprises a pipe string short section, wherein the interior of the pipe string short section is provided with a detachable inner nozzle upper ring, a detachable inner nozzle lower ring and a detachable fixing head in order from top to bottom. A first copper pad is provided on the top end surface of the inner nozzle upper ring, a second copper pad is provided between the inner nozzle lower ring and the inner nozzle upper ring, and a third copper pad is provided between the fixed head and the inner nozzle lower ring.

[0005] As a preferred embodiment of the present invention, The tubing string short section includes a cylindrical short section body, a short section cavity is provided at the lower part of the short section body, the inner nozzle upper ring, the inner nozzle lower ring and the fixed head are all arranged in the short section cavity, a plurality of air inlets are provided on the waist side wall of the short section cavity, and an inner step is provided on the top of the short section cavity. The inner nozzle upper ring comprises an annular upper ring body, the center of which is provided with an upper ring screw hole, and the upper surface of the upper ring of the upper ring body is provided with a plurality of evenly arranged upper ring air channels. The inner nozzle lower ring comprises a first disc-shaped disc body and a second disc-shaped disc body, a tubular connecting external threaded tube is provided in the center of the second disc body, a plurality of fixing holes are provided at the bottom of the first disc body, the connecting external threaded tube is matched with the screw hole of the upper ring, a detachable circular flow regulating orifice plate is provided at the bottom of the first disc body, a flow limiting hole is provided in the center of the flow regulating orifice plate, a pair of positioning holes are provided on the circumference of the flow limiting hole, and the positioning hole is connected to the fixing hole by screws. The fixing head comprises an annular fixing ring body, an outer thread of the ring body is arranged on the outer wall of the fixing ring body, and a hexagonal hexagonal hole is arranged in the center of the fixing ring body.

[0006] As a preferred embodiment of the present invention, the first copper pad is arranged between the upper surface of the upper ring and the inner step, the second copper pad is arranged between the lower surface of the upper ring body and the lower ring of the inner nozzle, and the third copper pad is located between the top end face of the fixed ring body and the bottom end face of the first disk body.

[0007] As a preferred embodiment of the present invention, the upper annular airway is inclined.

[0008] A gas lift tubular structure comprising any one of the aforementioned Venturi ejector devices, The gas lift tubular structure comprises an oil pipe and a casing, wherein the oil pipe is located inside the casing. A venturi ejector device and a check valve are provided at the lower portion of the inner wall of the oil pipe. The check valve is located below the venturi ejector device. A packer is provided at the lower part of the outer wall of the oil pipe, and the longitudinal depth of the packer is greater than the longitudinal depth of the check valve.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a Venturi ejector device, which can utilize the existing gas source at the wellhead for driving to a certain extent, thereby reducing additional power consumption. By generating a negative pressure effect and a suction effect in the low-pressure area of the throat, the liquid and the high-speed airflow meet in the throat and are entrained by the airflow to form a gas-liquid two-phase mixture, and the accumulated liquid is effectively extracted and discharged, thereby restoring and maintaining the normal production of the gas well, improving the natural gas recovery rate, extending the life of the gas well, and reducing the mining cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the solutions in the present invention, a brief introduction is given below to the drawings required for use in the description of the embodiments. 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 any creative work.

[0011] Figure 1 is a cross-sectional schematic diagram of the Venturi ejector device of the present invention; Figure 2 for Figure 1 A cross-sectional schematic diagram of a pipe string short section of a venturi ejector device; Figure 3 for Figure 1A schematic diagram of the structure of the inner nozzle upper ring of the Venturi ejector device; Figure 4 for Figure 3 Schematic cross-sectional view of the upper ring of the inner nozzle; Figure 5 for Figure 1 A schematic diagram of the structure of the inner nozzle lower ring of the Venturi ejector device; Figure 6 for Figure 5 A schematic cross-sectional view of the lower ring of the inner nozzle; Figure 7 for Figure 1 A schematic diagram of the structure of the flow regulating orifice plate of the venturi ejector device; Figure 8 for Figure 1 A schematic structural diagram of a fixed head of a venturi ejector device; Figure 9 This is a schematic diagram of the structure of the gas lift tubular structure of the present invention, at which point gas injection has not yet begun; Figure 10 This is a schematic diagram of the structure of the gas lift tubular structure of the present invention, at which point gas injection begins; Figure 11 This is a schematic diagram of the structure of the gas lift tubular structure of the present invention, at which point stable gas lift is achieved; The markings in the figure are as follows: 1. Column pup joint; 10. Pup joint body; 1S. Short-circuit cavity; 1a. Air inlet; 1b. Inner step; 2. Inner nozzle upper ring; 20. Upper ring body; 21. Upper ring screw hole; 2a. Upper ring upper surface; 2b. Upper ring air duct; 2c. Upper ring lower surface; 3. Inner nozzle lower ring; 31. First disk body; 32. Second disk body; 33. Connecting external threaded pipe; 3a. Fixing hole; 4. Flow regulating orifice plate; 4a. Positioning hole; 4b. Flow limiting hole; 5. Fixing head; 51. Fixing ring body; 52. Outer thread of ring body; 53. Hexagonal hole of ring body; 61. First copper pad; 62. Second copper pad; 63. Third copper pad. DETAILED DESCRIPTION

[0012] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0013] like Figure 1 As shown, the venturi ejector device S comprises a tubing nipple 1 , wherein a detachable inner nozzle upper ring 2 , a detachable inner nozzle lower ring 3 and a detachable fixing head 5 are sequentially provided inside the tubing nipple 1 from top to bottom.

[0014] A first copper pad 61 is provided on the top end surface of the inner nozzle upper ring 2 , a second copper pad 62 is provided between the inner nozzle lower ring 3 and the inner nozzle upper ring 2 , and a third copper pad 63 is provided between the fixing head 5 and the inner nozzle lower ring 3 .

[0015] like Figure 2 As shown, the tubing string pup joint 1 includes a cylindrical pup joint body 10, a pup joint cavity 1S is provided at the lower part of the pup joint body 10, the inner nozzle upper ring 2, the inner nozzle lower ring 3 and the fixed head 5 are all arranged in the pup joint cavity 1S, a plurality of air inlets 1a are provided on the waist side wall of the pup joint cavity 1S, and an inner step 1b is provided on the top of the pup joint cavity 1S.

[0016] like Figure 3 and Figure 4 As shown, the inner nozzle upper ring 2 includes an annular upper ring body 20, a upper ring screw hole 21 is provided in the center of the upper ring body 20, and a plurality of evenly arranged upper ring air channels 2b are provided on the upper ring upper surface 2a of the upper ring body 20. The first copper pad 61 is arranged between the upper ring upper surface 2a and the inner step 1b, and the second copper pad 62 is arranged between the upper ring lower surface 2c of the upper ring body 20 and the inner nozzle lower ring 3.

[0017] It should be noted that the upper annular airway 2b is inclined.

[0018] like Figure 5 and Figure 6 As shown, the inner nozzle lower ring 3 includes a disc-shaped first disc body 31 and a disc-shaped second disc body 32, a tubular connecting external threaded tube 33 is provided in the center of the second disc body 32, a plurality of fixing holes 3a are provided at the bottom of the first disc body 31, and the connecting external threaded tube 33 cooperates with the upper ring screw hole 21, a detachable circular flow regulating orifice plate 4 is provided at the bottom of the first disc body 31, a flow limiting hole 4b is provided in the center of the flow regulating orifice plate 4, a pair of positioning holes 4a are provided on the circumference of the flow limiting hole 4b, and the positioning hole 4a is connected to the fixing hole 3a by screws.

[0019] It should be noted that the flow regulating orifice plate 4 is a replaceable component, and a flow regulating orifice plate 4 with flow limiting holes 4b of different sizes can be used according to actual conditions.

[0020] like Figure 7 and Figure 8 As shown, the fixed head 5 includes an annular fixed ring body 51, an outer ring thread 52 is provided on the outer wall of the fixed ring body 51, a hexagonal ring body hexagonal hole 53 is provided in the center of the fixed ring body 51, and the third copper pad 63 is located between the top end face of the fixed ring body 51 and the bottom end face of the first disk body 31.

[0021] The working mode of the Venturi ejector device is described below.

[0022] First, the Venturi ejector device is installed on the drill string. During drainage operations, high-pressure gas enters from the air inlet 1a. Then, the upper ring air channel 2b further accelerates the gas, resulting in a negative pressure environment at the upper surface 2a of the upper ring. The resulting pressure difference sucks the liquid in the fixed head 5 and its lower part.

[0023] The Venturi ejector device can utilize the existing gas source at the wellhead for driving to a certain extent, reducing additional power consumption. By generating a negative pressure effect and the suction effect in the low-pressure area of the throat, the liquid meets the high-speed airflow at the throat and is entrained by the airflow to form a gas-liquid two-phase mixture, and effectively extracts and discharges the accumulated liquid, thereby achieving the purpose of rapid drainage of the gas well, restoring and maintaining the normal production of the gas well, improving the natural gas recovery rate, extending the life of the gas well, and reducing mining costs.

[0024] like Figure 9 FIG. 1 shows a gas lift tubular structure including the Venturi ejector device S. Specifically, the gas lift tubular structure includes an oil pipe 7 and a casing 8. The oil pipe 7 is located inside the casing 8. The Venturi ejector device S and a check valve 9 are provided on the lower portion of the inner wall of the oil pipe 7. The check valve 9 is located below the Venturi ejector device S.

[0025] A packer 10 is provided at the lower portion of the outer wall of the oil pipe 7 . The longitudinal depth of the packer 10 is greater than the longitudinal depth of the check valve 9 .

[0026] The working mode of the gas lift tubular structure is described below.

[0027] like Figure 9 As shown, at this time, gas injection has not yet started, and there is accumulated liquid K in the oil pipe 7 and the casing 8.

[0028] like Figure 10 As shown, when the casing 8 begins to inject gas along the direction F, the level of the accumulated liquid K between the oil pipe 7 and the casing 8 begins to drop. The accumulated liquid K in the oil-casing annulus (the cavity between the oil pipe 7 and the casing 8) enters the oil pipe 7 through the venturi ejector device S and continues to inject gas. The gas is ejected through the venturi ejector device S, reducing the pressure of the liquid column in the oil pipe 7, thereby causing the fluid pressure in the oil pipe 7 to be lower than the formation fluid pressure, thereby forming a pressure differential. This pressure differential presses the bottom fluid into the oil pipe 7, forming a mixed phase M of the bottom hole accumulated liquid and injected gas above the venturi ejector device S. The venturi ejector device S continuously replenishes fluid into the production string, and the liquid level in the oil pipe 7 begins to rise, achieving continuous assisted drainage and ultimately forming a stable gas lift. Figure 11 shown.

[0029] The gas lift tubular structure utilizes a Venturi ejector device to form a single-stage jet gas lift, achieving continuous assisted drainage with stability, reliability and excellent results.

[0030] Without limitation to this, any changes or substitutions that are not conceived through creative work should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims

1. A Venturi ejector device, characterized in that: The Venturi ejector device (S) comprises a pipe string short section (1), wherein the interior of the pipe string short section (1) is provided with a detachable inner nozzle upper ring (2), a detachable inner nozzle lower ring (3) and a detachable fixed head (5) in order from top to bottom. A first copper pad (61) is provided on the top end surface of the inner nozzle upper ring (2), a second copper pad (62) is provided between the inner nozzle lower ring (3) and the inner nozzle upper ring (2), and a third copper pad (63) is provided between the fixed head (5) and the inner nozzle lower ring (3).

2. The venturi ejector device according to claim 1, characterized in that The tubing string short section (1) comprises a cylindrical short section body (10), a short section cavity (1S) is provided at the lower portion of the short section body (10), the inner nozzle upper ring (2), the inner nozzle lower ring (3) and the fixed head (5) are all arranged in the short section cavity (1S), a plurality of air inlets (1a) are provided on the waist side wall of the short section cavity (1S), and an inner step (1b) is provided on the top of the short section cavity (1S). The inner nozzle upper ring (2) comprises an annular upper ring body (20), a ring screw hole (21) is provided at the center of the upper ring body (20), and a plurality of evenly arranged upper ring air channels (2b) are provided on the upper ring upper surface (2a) of the upper ring body (20). The inner nozzle lower ring (3) comprises a first disc-shaped disc body (31) and a second disc-shaped disc body (32), a tubular connecting external threaded tube (33) is provided at the center of the second disc body (32), a plurality of fixing holes (3a) are provided at the bottom of the first disc body (31), the connecting external threaded tube (33) cooperates with the upper ring screw hole (21), a detachable circular flow regulating orifice plate (4) is provided at the bottom of the first disc body (31), a flow limiting hole (4b) is provided at the center of the flow regulating orifice plate (4), a pair of positioning holes (4a) are provided on the circumference of the flow limiting hole (4b), and the positioning holes (4a) are connected to the fixing holes (3a) by screws. The fixing head (5) comprises an annular fixing ring body (51), an outer ring thread (52) is provided on the outer wall of the fixing ring body (51), and a hexagonal ring body hexagonal hole (53) is provided at the center of the fixing ring body (51).

3. The venturi ejector device according to claim 1, characterized in that The first copper pad (61) is arranged between the upper surface (2a) of the upper ring and the inner step (1b), the second copper pad (62) is arranged between the upper ring lower surface (2c) of the upper ring body (20) and the inner nozzle lower ring (3), and the third copper pad (63) is located between the top end surface of the fixed ring body (51) and the bottom end surface of the first disk body (31).

4. The venturi ejector device according to claim 1, wherein: The upper annular airway (2b) is inclined.

5. A gas lift tubular structure comprising a venturi ejector device according to any one of claims 1 to 4, The gas lift tubular structure comprises an oil pipe (7) and a casing (8), wherein the oil pipe (7) is located inside the casing (8). A venturi ejector device (S) and a check valve (9) are provided at the lower portion of the inner wall of the oil pipe (7). The check valve (9) is located below the venturi ejector device (S). A packer (10) is provided at the lower portion of the outer wall of the oil pipe (7), and the longitudinal depth of the packer (10) is greater than the longitudinal depth of the check valve (9).

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