Wellhead fracturing blowout natural gas recovery device

Abstract

The utility model discloses a wellhead fracturing blowout natural gas recovery device which comprises a first-stage horizontal type expansion pipe sand remover, a second-stage cyclone separator, a third-stage filter separator, an exhaust pipeline and an impurity collection box, the exhaust pipeline is installed on the third-stage filter separator, one end of the first-stage horizontal type expansion pipe sand remover is provided with a primary treatment structure, and the other end of the first-stage horizontal type expansion pipe sand remover is provided with a secondary treatment structure. The utility model relates to the technical field of natural gas recovery, natural gas passes through an end flowmeter for flow inspection, if the flow is smaller, one diverter valve is opened, and the natural gas passes through a filter screen plate for filtering gravel, is suitable for small-flow impurity removal, ensures the impurity removal quality, then enters a first-stage horizontal expansion pipe sand remover, and is discharged from an exhaust pipeline; if the flow is large, the straight-through valve is opened, the natural gas is directly discharged into the first-stage horizontal expansion pipe sand remover, large-flow impurity removal is carried out, the natural gas at the mining end is treated no matter how much the content of the natural gas is, waste is avoided, and the recovery quality of the natural gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas recovery, in particular to a wellhead fracturing and blowout natural gas recovery device. Background Art

[0002] Fracturing and venting gas in natural gas extraction is an important process, mainly used to improve the efficiency and output of natural gas extraction. During the fracturing process, the appropriate wellhead location is first selected and necessary equipment such as blowout preventers and pressure gauges are installed. Then, high-pressure liquid (usually a mixture of water, sand and other additives) or high-pressure gas (such as air or nitrogen) is introduced into the wellhead through a pipeline and injected into the bottom of the well. These high-pressure substances will force cracks in the rock layer at the bottom of the well, allowing natural gas to flow to the wellhead more easily. After fracturing is completed, as the cracks expand, natural gas will flow to the wellhead through these cracks, and will be collected and transported to the processing plant for further processing. In this process, fracturing and venting gas refers to the process of releasing the natural gas produced after fracturing through the wellhead.

[0003] A skid-mounted fracturing blowdown wellhead recovery and metering system with publication number CN205314966U comprises a wellhead gas main pipeline and a bypass pipeline, wherein the wellhead gas main pipeline is connected to the wellhead gas outlet, and the wellhead gas main pipeline is connected to a sand collecting box through a bypass pipeline; the wellhead gas main pipeline is also connected to a gas branch pipe A and a gas branch pipe B, and the other ends of the gas branch pipe A and the gas branch pipe B are respectively connected to a recovery device. The utility model adopts three-stage sand removal, and the sand removal and separation efficiency is high. A plurality of cyclone separator assemblies can meet a wide range of gas volume changes. The three-stage separation can make the treated natural gas reach the hydrocarbon water dew point of the pipeline, and prevent the formation of natural gas hydrates; however, in the patent document, the natural gas directly enters the first-stage horizontal expansion tube desander. If the mining environment affects the natural gas flow rate and causes a small amount, the desander effect of the first-stage horizontal expansion tube desander is poor, which affects the recovery efficiency of the natural gas. In addition, in the patent document, due to the small amount of natural gas in the blowdown at the initial stage, no recovery is performed, which will cause a certain degree of waste.

[0004] There may already be technical means to solve the above problems in the prior art, but this case intends to provide an alternative or replacement technical solution. Utility Model Content

[0005] In order to solve the problems raised in the background technology, the utility model is implemented through the following technical solutions: a wellhead fracturing blowout natural gas recovery device, including a first-stage horizontal expansion tube desander, a second-stage cyclone separator, a third-stage filter separator, an exhaust pipeline and a collection box, wherein the exhaust pipeline is installed on the third-stage filter separator, and a primary processing structure is installed at one end of the first-stage horizontal expansion tube desander;

[0006] The primary treatment structure comprises a primary air intake pipe, the primary air intake pipe is installed on a primary horizontal expansion pipe desander, a primary connecting pipe is installed at one end of the primary air intake pipe, a plurality of treatment parts are installed on the primary connecting pipe, a primary air intake pipe is installed on the primary connecting pipe, an end flow meter is installed at one end of the primary air intake pipe, a discharge injection pipe is installed at one end of the end flow meter, a through valve is installed on the primary air intake pipe, and the through valve is connected to the primary air intake pipe through the through pipe;

[0007] Each of the processing parts includes a diverter valve, which is installed on the primary connecting pipe. A filter box is installed at one end of the diverter valve. A filter screen is inserted into the inner wall of the filter box. A branch flow meter is installed between the filter box and the primary connecting pipe.

[0008] Preferably, the first-stage horizontal expansion tube desander, the second-stage cyclone separator, and the third-stage filter separator are connected in sequence through a ventilation pipe.

[0009] Preferably, a main impurity collection pipeline is installed on the impurity collection box, and branch impurity discharge valves are provided on the first-stage horizontal expansion tube desander, the second-stage cyclone separator and the third-stage filter separator, and the branch impurity discharge valves are installed on the main impurity collection pipeline.

[0010] Preferably, a primary impurity discharge valve is installed on the lower wall of the filter box, and an impurity discharge connecting pipe is installed at one end of the primary impurity discharge valve, and the impurity discharge connecting pipe is interconnected with the impurity collecting main pipeline.

[0011] Preferably, a limiting groove is provided on the inner wall surface of the filter box, and the filter screen plate is installed on the limiting groove.

[0012] Preferably, a closed cover plate is installed on the filter box, and a sealing gasket is installed between the closed cover plate and the filter box.

[0013] Beneficial Effects

[0014] The utility model provides a wellhead fracturing and blowing natural gas recovery device, which has the following beneficial effects compared with the prior art: the natural gas is flow-tested by an end flow meter, and if the flow is small, one of the diverter valves is opened, and the natural gas is filtered through a filter screen to filter sand and gravel, which is suitable for small flow impurity removal to ensure the quality of impurity removal, and then enters a first-stage horizontal expansion pipe desander and is discharged from an exhaust pipe. If the flow is large, the straight-through valve is opened, and the natural gas is directly discharged into the first-stage horizontal expansion pipe desander to remove impurities at a large flow rate, and the natural gas at the mining end is processed regardless of the natural gas content, thereby avoiding waste and improving the quality of natural gas recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of the main structure of the wellhead fracturing and blowing natural gas recovery device of the utility model.

[0016] Figure 2 It is a partial top view structural schematic diagram of the wellhead fracturing and blowing natural gas recovery device of the utility model.

[0017] Figure 3 The utility model is a wellhead fracturing and blowing natural gas recovery device Figure 1 Schematic diagram of the partially enlarged structure.

[0018] In the figure: 1. a first-stage horizontal expansion tube desander, 2. a second-stage cyclone separator, 3. a third-stage filter separator, 4. an exhaust pipe, 5. a collecting box, 6. a first-stage air inlet pipe, 7. a first-stage connecting pipe, 8. a primary connecting pipe, 9. an end flow meter, 10. a spray inlet pipe, 11. a straight-through valve, 12. a straight-through pipe, 13. a diverter valve, 14. a filter box, 15. a filter screen, 16. a branch flow meter, 17. a ventilation pipe, 18. a collecting main pipe, 19. a branch exhaust valve, 20. a primary exhaust valve, 21. an exhaust connecting pipe, 22. a closing cover plate, 23. a sealing gasket, 24. a primary air inlet pipe. DETAILED DESCRIPTION

[0019] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0020] Example: See Figure 1-3 In order to solve the problem that the desanding effect is poor when the natural gas flow rate is small, which affects the natural gas recovery efficiency, and the natural gas content in the gas jet is small in the early stage of the release, and no recovery is done, resulting in waste, this technical solution is designed. The detailed technical solution is as follows;

[0021] A wellhead fracturing blowout natural gas recovery device comprises a first-stage horizontal expansion pipe desander 1, a second-stage cyclone separator 2, a third-stage filter separator 3, an exhaust pipe 4 and a collection box 5. The exhaust pipe 4 is installed on the third-stage filter separator 3. A primary processing structure is installed at one end of the first-stage horizontal expansion pipe desander 1.

[0022] Specifically, the primary processing structure includes a primary air intake pipe 6, which is installed on a primary horizontal expansion pipe desander 1, a primary connecting pipe 7 is installed at one end of the primary air intake pipe 6, a plurality of processing parts are installed on the primary connecting pipe 7, a primary connecting pipe 8 is installed at one end of the plurality of processing parts, a primary air intake pipe 24 is installed on the primary connecting pipe 8, an end flow meter 9 is installed at one end of the primary air intake pipe 24, a discharge injection pipe 10 is installed at one end of the end flow meter 9, a through valve 11 is installed on the primary air intake pipe 24, and the through valve 11 is connected to the primary air intake pipe 6 through a through pipe 12;

[0023] Specifically, each processing unit includes a diverter valve 13, which is installed on the primary connecting pipe 8, a filter box 14 is installed at one end of the diverter valve 13, a filter screen 15 is inserted on the inner wall of the filter box 14, and a branch flow meter 16 is installed between the filter box 14 and the primary connecting pipe 7;

[0024] It should be noted that the natural gas at the mining end enters from the blow-in pipe 10, and is tested for flow rate by the end flow meter 9. If the flow rate is small, one of the diverter valves 13 is opened, and the natural gas enters the filter box 14 through the primary connecting pipe 8 and the diverter valve 13, and is filtered through the filter screen 15 to filter sand and gravel, which is suitable for small flow impurity removal to ensure the quality of impurity removal. Then, it enters the primary connecting pipe 7 and the primary air intake pipe 6 through the branch flow meter 16, and then enters the primary horizontal expansion pipe desander 1, the secondary cyclone separator 2, and the tertiary filter separator 3, and is finally discharged from the exhaust pipe 4. For the recovered natural gas, if the branch flow meter 16 detects a small flow rate, the filter screen 15 may be blocked, and the diverter valve 13 of the passage is closed, and the diverter valve 13 on the other passage is opened to ensure normal removal of impurities from the natural gas. If the natural gas flow rate detected by the end flow meter 9 is large, the through valve 11 is opened, and the natural gas is directly discharged into the first-level horizontal expansion tube desander 1 through the through valve 11 and the through pipe 12 to remove impurities at a large flow rate. The natural gas at the mining end is processed regardless of the natural gas content, avoiding waste and improving the quality of natural gas recovery.

[0025] As a preferred embodiment, further, the first-stage horizontal expansion tube desander 1, the second-stage cyclone separator 2, and the third-stage filter separator 3 are sequentially connected through a ventilation pipe 17 for gas circulation;

[0026] As a preferred embodiment, further, a main impurity collecting pipe 18 is installed on the impurity collecting box 5, and a branch impurity discharge valve 19 is provided on the first-stage horizontal expansion tube desander 1, the second-stage cyclone separator 2 and the third-stage filter separator 3. The branch impurity discharge valve 19 is installed on the main impurity collecting pipe 18. When the impurities are discharged, the branch impurity discharge valve 19 is opened, and the impurities enter the impurity collecting box 5 through the main impurity collecting pipe 18;

[0027] As a preferred embodiment, further, a primary impurity discharge valve 20 is installed on the lower wall of the filter box 14, and an impurity discharge connecting pipe 21 is installed at one end of the primary impurity discharge valve 20. The impurity discharge connecting pipe 21 is interconnected with the impurity collecting main pipeline 18. When the primary impurity discharge valve 20 is opened, impurities enter the impurity collecting main pipeline 18 through the impurity discharge connecting pipe 21, and then enter the impurity collecting box 5;

[0028] As a preferred embodiment, further, a limiting groove is provided on the inner wall of the filter box 14, and the filter screen plate 15 is installed on the limiting groove, which is used for the installation and limiting of the filter screen plate 15;

[0029] Preferably, further, a closing cover plate 22 is installed on the filter box 14, and a sealing gasket 23 is installed between the closing cover plate 22 and the filter box 14. The closing cover plate 22 closes the opening portion of the filter box 14, and the sealing gasket 23 is used to seal between the closing cover plate 22 and the filter box 14. The closing cover plate 22 and the filter mesh plate 15 are also sealed at the same time.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wellhead fracturing blowout natural gas recovery device, comprising a first-stage horizontal expansion tube desander (1), a second-stage cyclone separator (2), a third-stage filter separator (3), an exhaust pipe (4) and a collection box (5), wherein the exhaust pipe (4) is installed on the third-stage filter separator (3), and is characterized in that: A primary processing structure is installed at one end of the first-stage horizontal expansion tube desander (1); The primary treatment structure comprises a primary air intake pipe (6), the primary air intake pipe (6) being mounted on a primary horizontal expansion pipe desander (1), a primary connecting pipe (7) being mounted on one end of the primary air intake pipe (6), a plurality of treatment parts being mounted on the primary connecting pipe (7), a primary air intake pipe (24) being mounted on one end of the plurality of treatment parts, a primary connecting pipe (8) being mounted on one end of the primary connecting pipe (8), a primary air intake pipe (24) being mounted on one end of the primary air intake pipe (24), a discharge inlet pipe (10) being mounted on one end of the end flowmeter (9), a through valve (11) being mounted on the primary air intake pipe (24), and the through valve (11) being connected to the primary air intake pipe (6) via a through pipe (12); Each of the processing sections comprises a diverter valve (13), the diverter valve (13) being mounted on the primary connecting pipe (8), a filter box (14) being mounted on one end of the diverter valve (13), a filter screen (15) being inserted on the inner wall of the filter box (14), and a branch flow meter (16) being mounted between the filter box (14) and the primary connecting pipe (7).

2. The wellhead fracturing blowout natural gas recovery device according to claim 1, characterized in that: The first-stage horizontal expansion tube desander (1), the second-stage cyclone separator (2), and the third-stage filter separator (3) are connected in sequence via a ventilation pipeline (17).

3. The wellhead fracturing blowout natural gas recovery device according to claim 1, characterized in that: The impurity collecting box (5) is provided with an impurity collecting main pipeline (18), and the first-stage horizontal expansion tube desander (1), the second-stage cyclone separator (2) and the third-stage filter separator (3) are all provided with branch impurity discharge valves (19), and the branch impurity discharge valves (19) are installed on the impurity collecting main pipeline (18).

4. The wellhead fracturing blowout natural gas recovery device according to claim 3, characterized in that: A primary impurity discharge valve (20) is installed on the lower wall of the filter box (14), and an impurity discharge connecting pipe (21) is installed at one end of the primary impurity discharge valve (20), and the impurity discharge connecting pipe (21) is interconnected with the impurity collecting main pipeline (18).

5. The wellhead fracturing blowout natural gas recovery device according to claim 1, characterized in that: The inner wall surface of the filter box (14) is provided with a limiting groove, and the filter screen plate (15) is installed on the limiting groove.

6. The wellhead fracturing blowout natural gas recovery device according to claim 1, characterized in that: A closed cover plate (22) is installed on the filter box (14), and a sealing gasket (23) is installed between the closed cover plate (22) and the filter box (14).

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