Shale gas wellhead high-pressure sand removal and liquid drainage integrated system

Abstract

The utility model relates to the technical field of natural gas extraction, in particular to a shale gas wellhead high-pressure sand removal and liquid drainage integrated system which comprises a rotational flow sand removal mechanism and a sand removal and liquid drainage mechanism which are connected in series through a communication pipeline, and the sand removal and liquid drainage mechanism is communicated with a throttle manifold table; gas production pipes of the gas wells are connected with at least one confluence pipeline, and the cyclone desanding mechanism is connected with the confluence pipeline; the communicating pipeline is provided with a control valve, the confluence pipeline is provided with a switch valve, and the sand removing and liquid discharging mechanism comprises a rotational flow sand removing mechanism. The two mechanisms are combined to form an integrated system, sand removal and liquid drainage treatment is conducted on gas well products, the problem that sand removal and liquid drainage are time-consuming and labor-consuming to clean when a filter type sand remover is adopted is solved, sand is removed step by step, the sand removal and liquid drainage effect is good, the integration degree is higher, operation is convenient, and the working efficiency is improved. The device is suitable for the working conditions of high gas well pressure, high gas production rate, high water outlet rate and high sand production rate in the initial stage of gas well production.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas exploitation, and particularly relates to an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead. Background Technique

[0002] In the initial stage of production of gas wells on the shale gas platform, the gas well pressure is high, the gas production is large, and the water and sand production are large. If the water and sand removal are not sufficient, there will be a risk of pipeline corrosion and leakage.

[0003] Currently, in general, a filter-type sand remover is connected to the outlet of each well on the shale gas platform well, and the filter-type sand remover is used for sand removal and liquid drainage. The filter element of the filter-type sand remover is heavy, and special disassembly, installation and cleaning tools are required to cooperate to realize the disassembly, installation, cleaning of the filter element and sand removal and liquid drainage. Due to the large weight of the filter element and the tools, the single disassembly takes 1 - 2 hours, which is time-consuming and laborious. For the serious sand production condition in the initial stage of gas well production, the disassembly and cleaning frequency of the filter-type sand remover can be as high as 3 - 4 times a day, increasing the on-site workload and labor cost, and the operation difficulty at night is large. It is easy to cause pipeline blockage due to excessive sand production, and there are safety risks. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the time-consuming and laborious problems in the sand removal and liquid drainage process after the gas well is put into production in the prior art, and provide an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead.

[0005] The utility model provides an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead, including:

[0006] A cyclone sand removal mechanism and a sand removal and liquid drainage mechanism, the cyclone sand removal mechanism and the sand removal and liquid drainage mechanism are connected in series through a connecting pipeline, and the sand removal and liquid drainage mechanism is communicated with a choke manifold platform;

[0007] Gas wells, the gas production pipes of several gas wells are connected to at least one confluence pipeline, and the cyclone sand removal mechanism is connected to the confluence pipeline;

[0008] The connecting pipeline is provided with a control valve, the confluence pipeline is provided with a switch valve, and the sand removal and liquid drainage mechanism includes a cyclone sand removal mechanism.

[0009] An integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead of the present utility model. The cyclone sand removal mechanism is used to remove the grit in the gas well output, and the sand removal and liquid drainage mechanism is used to remove the liquid in the gas well output and further remove the grit. The process of discharging the grit from the cyclone sand removal mechanism and the sand removal and liquid drainage mechanism does not require the removal of the internal structure, avoiding the time-consuming and laborious problems of removing the filter screen for sand removal, liquid drainage and cleaning faced by the filter type sand remover. At the same time, through the combination of the two mechanisms to form an integrated system, the sand removal and liquid drainage treatment of the output of multiple gas wells is completed, and the grit is gradually removed, so that the sand removal and liquid drainage effect is better, and the integration degree is higher, which is convenient for operation and adapts to the working conditions of high gas well pressure, large gas production, large water production and large sand production at the initial stage of gas well production. At the same time, the sand removal and liquid drainage can be completed before the throttling and pressure reduction of the throttling manifold platform for the gas well output, so that the gas well output has been subjected to sand removal and liquid drainage treatment in the high-pressure part of the wellhead, and it is not easy to cause blockage and erosion of other pipelines in the subsequent transportation.

[0010] Preferably, the cyclone sand removal mechanism and the sand removal and liquid drainage mechanism are respectively connected with the confluence pipeline. When the cyclone sand removal mechanism or the sand removal and liquid drainage mechanism fails, the sand removal and liquid drainage treatment can continue, ensuring the continuous normal production of the gas well and improving the production efficiency.

[0011] Preferably, the throttling manifold platform is connected with the confluence pipeline. When both the cyclone sand removal mechanism and the sand removal and liquid drainage mechanism are blocked and fail, the gas well output can be further directly sent to the throttling manifold platform for throttling and pressure reduction treatment, avoiding the production stop caused by the equipment blockage failure.

[0012] Preferably, the throttling manifold platform is provided with a single-well metering mechanism, and a plurality of the single-well metering mechanisms are connected in parallel to the total output metering mechanism. The output branch composed of the gas well, the cyclone sand removal mechanism, the sand removal and liquid drainage mechanism, the throttling manifold platform and the single-well metering mechanism, and a plurality of output branches are converged and output, forming a sand removal and liquid drainage system for the natural gas wellhead composed of a plurality of conveying branches.

[0013] Preferably, the cyclone sand removal mechanism includes a cyclone cylinder and a sand storage cylinder which are connected up and down, a cut-off valve is arranged between the cyclone cylinder and the sand storage cylinder, a cyclone is arranged in the cyclone cylinder, a first sand discharge port is arranged at the bottom of the sand storage cylinder, an air inlet pipe is communicated with the side wall of the cyclone cylinder, and an air outlet pipe is communicated with the top of the cyclone cylinder. Under the action of the cyclone in the cyclone cylinder, most of the grit in the gas well output remains at the bottom of the sand storage cylinder and is output through the first sand discharge port, and the air flow therein is output through the air outlet pipe at the top of the cyclone cylinder, adapting to the working condition of large sand removal amount at the initial stage of gas well production, so that the sand and liquid in the gas well output are gradually removed, and the treatment effect is improved.

[0014] Preferably, the inlets of the inlet pipe and the outlets of the outlet pipe are both arranged lower than the first sand discharge port. The gas well products enter the cyclone cylinder in a state of being conveyed from bottom to top and are output from the cyclone cylinder in a state of being conveyed from top to bottom, so that the separation effect of the gas flow and the sand is better, and the treatment effect is improved.

[0015] Preferably, the sand storage cylinder is connected with a flushing pipeline, and the flushing pipeline includes a first branch pipe, a second branch pipe and a third branch pipe connected in a converging manner. The first branch pipe is communicated with the inlet pipe, the second branch pipe is communicated with the sand storage cylinder, the third branch pipe is connected with a liquid supply mechanism, and regulating valves are respectively arranged on the first branch pipe, the second branch pipe and the third branch pipe. The sand storage cylinder can be flushed and cleaned by the gas well products and the liquid provided by the liquid supply mechanism, which is convenient for cleaning the sand storage cylinder.

[0016] Preferably, the sand removal and liquid drainage mechanism includes a gas-liquid separation cylinder, and the gas-liquid separation cylinder is connected with an inlet gas pipeline and an outlet gas pipeline. The inlet gas pipeline is communicated above the side wall of the gas-liquid separation cylinder, the outlet gas pipeline is communicated with the top of the gas-liquid separation cylinder, a second sand discharge port is arranged at the bottom of the gas-liquid separation cylinder, a liquid discharge port is arranged below the side wall of the gas-liquid separation cylinder, and the inlets of the inlet gas pipeline and the outlets of the outlet gas pipeline are both arranged lower than the bottom of the gas-liquid separation cylinder. This sand removal and liquid drainage mechanism can carry out gas-liquid-solid separation on the gas well products, can further remove the sand and liquid in the gas well products, and mainly plays a role in removing water.

[0017] Preferably, a cyclone assembly, a rectifier and a mist replenisher are arranged in the gas-liquid separation cylinder. The cyclone assembly is arranged opposite to the through position of the inlet gas pipeline on the gas-liquid separation cylinder, and the rectifier and the mist replenisher are arranged above the through position. To further improve the treatment effect on the gas well products.

[0018] Preferably, the inlet gas pipeline includes a plurality of erosion-resistant joints connected by pipelines. The erosion-resistant joint includes a forged cubic three-way joint, and a safety valve is arranged on the inlet gas pipeline; the erosion-resistant joint is arranged at the second sand discharge port. To avoid the erosion of the pipeline by the gas well product fluid containing solid and liquid impurities and extend the service life of the sand removal and liquid drainage mechanism.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. The present utility model provides a shale gas wellhead high-pressure sand removal and liquid drainage integrated system. The cyclone sand removal mechanism is used to remove the gravel in the gas well products, and the sand removal and liquid drainage mechanism is used to remove the liquid in the gas well products and further remove the gravel. The gravel discharge process of the cyclone sand removal mechanism and the sand removal and liquid drainage mechanism does not require the removal of the internal structure, avoiding the time-consuming and laborious problems of sand removal, liquid drainage and cleaning faced by the filter type sand remover;

[0021] 2. The present utility model provides an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead. By combining two mechanisms to form an integrated system, the sand removal and liquid drainage treatment of the produced substances from multiple gas wells is completed, and the sand is gradually removed, resulting in better sand removal and liquid drainage effects.

[0022] 3. The present utility model provides an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead. By combining two mechanisms, the integration degree is higher, which is convenient for operation and suitable for the working conditions of high gas well pressure, large gas production, large water output, and large sand output in the initial stage of gas well production.

[0023] 4. The present utility model provides an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead. By completing the sand removal and liquid drainage of the gas well produced substances before the throttling and pressure reduction effect of the throttle manifold platform, the gas well produced substances have undergone sand removal and liquid drainage treatment in the high-pressure part of the wellhead, and it is not easy to cause blockage and erosion of other pipelines during subsequent transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead in Embodiment 1; Figure 1 ;

[0025] Figure 2 is a schematic structural diagram of an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead in Embodiment 1; Figure 2 ;

[0026] Figure 3 is a schematic structural diagram of an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead in Embodiment 1; Figure 3 ;

[0027] Figure 4 is a schematic structural diagram of an integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead in Embodiment 1; Figure 4 ;

[0028] Figure 5 is a schematic structural diagram of the cyclone sand removal mechanism in Embodiment 2;

[0029] Figure 6 is a schematic structural diagram of the sand removal and liquid drainage mechanism in Embodiment 3;

[0030] Markings in the figure:

[0031] 10 - cyclone sand removal mechanism, 101 - cyclone cylinder, 102 - sand storage cylinder, 103 - cut-off valve, 104 - first sand discharge port, 105 - intake pipe, 106 - outlet pipe;

[0032] 20 - Sand removal and liquid drainage mechanism, 201 - Gas - liquid separation cylinder, 202 - Intake pipeline, 2021 - Erosion - resistant joint, 203 - Exhaust pipeline, 204 - Second sand discharge port, 205 - Liquid discharge port, 206 - Cyclone assembly, 207 - Rectifier, 208 - Mist - supplement device, 209 - Safety valve;

[0033] 30 - Connecting pipeline, 301 - Control valve;

[0034] 40 - Choke manifold platform;

[0035] 50 - Gas well, 501 - Gas production pipe;

[0036] 60 - Confluence pipeline, 601 - On - off valve;

[0037] 70 - Flushing pipeline, 701 - First branch pipe, 702 - Second branch pipe, 703 - Third branch pipe, 704 - Control valve;

[0038] 80 - Single - well metering mechanism, 90 - Total output metering mechanism. Detailed implementation mode

[0039] The present utility model will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0040] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms of the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the utility model product / equipment / device is usually used and placed. These terms of orientation or position relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific position relationship. Therefore, it cannot be understood as a limitation to the present utility model.

[0041] In addition, when terms such as "horizontal", "vertical", "hanging", and "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel. Instead, it can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8% of the error / deviation, more preferably within ±6% of the error / deviation, more preferably within ±5% of the error / deviation, and more preferably within ±4% of the error / deviation. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0042] In addition, when expressions such as "first", "second", "third", etc. appear in the terms, they are only used to distinguish the descriptions of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0043] In addition, in the description of the embodiments of the present utility model, "several", "multiple", and "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a situation of more than 9.

[0044] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "connected to", "provided with", "laid", and "arranged" appear, they 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 connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0045] Embodiment 1

[0046] As Figure 1 shown, a high-pressure sand removal and liquid drainage integrated system for shale gas wellheads includes:

[0047] A cyclone sand removal mechanism 10 and a sand removal and liquid drainage mechanism 20. The cyclone sand removal mechanism 10 and the sand removal and liquid drainage mechanism 20 are connected in series through a communication pipeline 30, and the sand removal and liquid drainage mechanism 20 is communicated with a choke manifold platform 40;

[0048] Taking four gas wells 50 as an example, the production gas pipes 501 of the four gas wells 50 are converged and connected to a converging pipeline 60, and the converging pipeline 60 is communicated with the cyclone sand removal mechanism 10;

[0049] The connecting pipeline 30 is provided with a control valve 301, and the confluence pipeline 60 is provided with a switching valve 601.

[0050] In a shale gas wellhead high-pressure sand removal and liquid drainage integrated system according to this embodiment, sand removal and liquid drainage of the product of the gas well 50 are carried out through the separation effect and sand discharge function of the cyclone sand removal mechanism 10. The cyclone sand removal mechanism 10 forcibly changes the flow direction of the sand-carrying fluid from a straight form to a spiral form, so that the fluid generates a swirling flow field. Under the combined action of the cyclone mechanism and gravity, the relatively denser sand and gravel are separated and settle downward, and the gas with a relatively small relative seal is output upward. The settled sand and gravel and liquid can be discharged at the bottom of the cyclone sand removal mechanism 10 without removing the internal structure of the cyclone sand removal mechanism 10, which is suitable for the working condition with a large amount of sand production in the initial stage of the production of the gas well 50, and avoids the problem of time-consuming and laborious cleaning of sand removal and liquid drainage when using a filter type sand remover; the sand removal and liquid drainage mechanism 20 performs water treatment on the airflow processed by the cyclone sand removal mechanism 10 and further removes sand and gravel, so that through the series combination structure of the cyclone sand removal mechanism 10 and the sand removal and liquid drainage mechanism 20, the sand removal and liquid drainage treatment of the products of multiple gas wells 50 is completed, the sand removal and liquid drainage effect is better, and the integration degree is higher, which is convenient for operation. During production, when the product of the gas well 50 is output at the wellhead, the pressure is reduced to about 12 MPa after the first-stage throttling. After the sand removal and liquid drainage treatment by the series combination structure, it is further throttled by the throttle manifold platform 40 to reduce the pressure to a conveying pressure of about 2.5 MPa, so that the sand removal and liquid drainage of the product of the gas well 50 can be completed before the throttling and pressure reduction action of the throttle manifold platform 40, that is, the sand removal and liquid drainage treatment has been carried out in the high-pressure part of the wellhead, and it is not easy to cause blockage and erosion of other pipelines in the subsequent transportation.

[0051] In one or several embodiments, as Figure 2 shown, the gas production pipes 501 of four gas wells 50 can be confluently connected to two confluence pipelines 60, and the cyclone sand removal mechanism 10 and the sand removal and liquid drainage mechanism 20 are respectively connected to one confluence pipeline 60, so that multiple distributed gas wells 50 can all carry out sand removal and liquid drainage treatment through the centrally arranged cyclone sand removal mechanism 10 and the sand removal and liquid drainage mechanism 20. When in use, according to the production working condition, by adjusting the on-off states of the control valve 301 and the switching valve 601 and controlling through the valves on each pipeline, any cyclone sand removal mechanism 10 and / or sand removal and liquid drainage mechanism 20 can be selected to process the product of the gas well 50, improving the system adaptability. When the cyclone sand removal mechanism 10 or the sand removal and liquid drainage mechanism 20 is blocked or fails, sand removal and liquid drainage can still be carried out to ensure the continuous normal production of the gas well 50 and improve the production efficiency.

[0052] In one or several embodiments, as Figure 3As shown, the gas production pipes 501 of four gas wells 50 can be connected in a confluence manner to three confluence pipes 60, and one of the confluence pipes 60 is connected to the choke manifold platform 40. In this way, according to the actual situation, when both the cyclone sand removal mechanism 10 and the sand removal and liquid drainage mechanism 20 are blocked or malfunctioning, the output of the gas well 50 can be directly sent to the choke manifold platform 40 for throttle pressure reduction treatment, avoiding production stoppage caused by equipment failures.

[0053] In one or several embodiments, when the number of gas wells 50 further increases, the confluence connection of the gas production pipes 501 of the gas wells 50 can be carried out according to the actual situation, such as Figure 4 As shown, every four of the eight gas wells 50 are connected in a confluence manner to form output branches composed of the gas wells 50, the cyclone sand removal mechanism 10, the sand removal and liquid drainage mechanism 20, and the choke manifold platform. Multiple output branches are confluently output to form a sand removal and liquid drainage system for the natural gas wellhead composed of multiple conveying branches. During actual production, a single-well metering mechanism 80 can be set on the choke manifold platform, and then multiple single-well metering mechanisms 80 are connected in a confluence manner to the total output metering mechanism 90 for total metering and external transportation, forming a system for removing water and sand by combining two cyclone sand removal mechanisms 10 and two sand removal and liquid drainage mechanisms 20 for the upper and lower half-branches of eight wells.

[0054] Embodiment 2

[0055] As Figure 5 Shown, in a shale gas wellhead high-pressure sand removal and liquid drainage integrated system of this embodiment, on the basis of Embodiment 1, the cyclone sand removal mechanism 10 includes a cyclone barrel 101 and a sand storage barrel 102 that are connected up and down. A cut-off valve 103 is provided between the cyclone barrel 101 and the sand storage barrel 102. A cyclone is provided inside the cyclone barrel 101. A first sand discharge port 104 is provided at the bottom of the sand storage barrel 102. The side wall of the cyclone barrel 101 is connected to an intake pipe 105, and the top of the cyclone barrel 101 is connected to an outlet pipe 106.

[0056] In a shale gas wellhead high-pressure sand removal and liquid drainage integrated system of this embodiment, the output of the gas well 50 is separated under the action of the cyclone inside the cyclone barrel 101. The sand and water therein are retained at the bottom of the sand storage barrel 102 and output through the first sand discharge port 104, and the gas therein is output through the outlet pipe 106 at the top of the cyclone barrel 101, preliminarily removing the sand and water in the output of the gas well 50. It is suitable for use in the working condition with a large sand discharge volume at the initial stage of the production of the gas well 50, reducing the working pressure of the subsequent sand removal and liquid drainage mechanism 20, gradually removing the sand and liquid in the output of the gas well 50, and improving the treatment effect.

[0057] In an optional embodiment, the cut-off valve 103 can be a flat gate valve.

[0058] In an alternative embodiment, the inlet of the intake pipe 105 and the outlet of the outlet pipe 106 are both set lower than the first sand discharge port 104. The product produced by the gas well 50 enters the cyclone 101 in a state of being transported from bottom to top and is output from the cyclone 101 in a state of being transported from top to bottom, so that the separation effect of gas, liquid and sand is better and the treatment effect is improved.

[0059] In one or several embodiments, the sand storage cylinder 102 is connected with a flushing pipeline 70. The flushing pipeline 70 includes a first branch pipe 701, a second branch pipe 702 and a third branch pipe 703 that are connected in a converging manner. The first branch pipe 701 is communicated with the intake pipe 105, the second branch pipe 702 is communicated with the sand storage cylinder 102, the third branch pipe 703 is connected with a liquid supply mechanism, and regulating valves 704 are respectively arranged on the first branch pipe 701, the second branch pipe 702 and the third branch pipe 703, so that the sand storage cylinder 102 can be flushed and cleaned by the product produced by the gas well 50 and the liquid provided by the liquid supply mechanism, which is convenient for cleaning the sand removal and liquid drainage mechanism 20.

[0060] In an alternative embodiment, the regulating valve 704 can be a ball valve.

[0061] Embodiment 3

[0062] As Figure 6 As shown, for a high-pressure sand removal and liquid drainage integrated system at the shale gas wellhead in this embodiment, on the basis of Embodiment 1 or Embodiment 2, the sand removal and liquid drainage mechanism 20 includes a gas-liquid separation cylinder 201. The gas-liquid separation cylinder 201 is connected with an intake pipeline 202 and an outlet pipeline 203. The intake pipeline 202 is communicated above the side wall of the gas-liquid separation cylinder 201, the outlet pipeline 203 is communicated with the top of the gas-liquid separation cylinder 201. A second sand discharge port 204 is arranged at the bottom of the gas-liquid separation cylinder 201, and a liquid discharge port 205 is arranged below the side wall of the gas-liquid separation cylinder 201. The inlet of the intake pipeline 202 and the outlet of the outlet pipeline 203 are both set lower than the bottom of the gas-liquid separation cylinder 201.

[0063] For a high-pressure sand removal and liquid drainage integrated system at the shale gas wellhead in this embodiment, the sand removal and liquid drainage mechanism 20 can further perform gas-liquid-solid separation on the product produced by the gas well 50 after being sand-removed by the cyclone sand removal mechanism 10, mainly removing the water in the product produced by the gas well 50 and further removing the sand therein.

[0064] In an alternative embodiment, a swirl component 206, a rectifier 207, and a mist eliminator 208 are disposed inside the gas-liquid separation cylinder 201. The swirl component 206 is disposed opposite to the through position of the intake pipe 202 on the gas-liquid separation cylinder 201. The rectifier 207 and the mist eliminator 208 are disposed above the through position. The swirl component 206 is used to deflect the linearly transported gas-liquid into a curved transportation. The rectifier 207 is used to rectify and output the separated liquid. The mist eliminator 208 is used to remove the liquid in the airflow, so that the liquid in the gas well 50 product after being treated by the sand removal and liquid drainage mechanism 20 can also be further removed inside the gas-liquid separation cylinder 201, so as to further improve the treatment effect on the gas well 50 product.

[0065] In one or several embodiments, the intake pipe 202 includes a plurality of erosion-resistant joints 2021 connected by pipes. The erosion-resistant joint 2021 includes a forged square three-way. The intake pipe 202 is provided with a safety valve 209. The second sand discharge port 204 is also provided with an erosion-resistant joint 2021. The erosion-resistant joint 2021 resists the direct erosion of the fluid at the position where the fluid turns through the thickness of its own structure, reducing the flow velocity of the sand or liquid in the gas well 50 product entering the sand removal and liquid drainage mechanism 20, so as to avoid the erosion of the remaining pipelines by the gas well 50 product fluid containing solid and liquid impurities and extend the service life of the sand removal and liquid drainage mechanism 20.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead, characterized in that, Including: A cyclone sand removal mechanism (10) and a sand removal and liquid drainage mechanism (20). The cyclone sand removal mechanism (10) and the sand removal and liquid drainage mechanism (20) are connected in series through a connecting pipeline (30), and the sand removal and liquid drainage mechanism (20) is connected to a choke manifold platform (40); Gas wells (50). The production pipes (501) of several gas wells (50) are connected to at least one confluence pipeline (60), and the cyclone sand removal mechanism (10) is connected to the confluence pipeline (60); A control valve (301) is provided on the connecting pipeline (30), and a switching valve (601) is provided on the confluence pipeline (60).

2. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 1, wherein, The cyclone sand removal mechanism (10) and the sand removal and liquid drainage mechanism (20) are respectively connected to the confluence pipeline (60).

3. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 1 or 2, characterized in that The choke manifold platform (40) is connected to the confluence pipeline (60).

4. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 3, wherein, The choke manifold platform (40) is provided with a single-well metering mechanism (80), and several single-well metering mechanisms (80) are connected in confluence to a total output metering mechanism (90).

5. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 1, characterized in that, The cyclone sand removal mechanism (10) includes a cyclone cylinder (101) and a sand storage cylinder (102) which are connected in an up-and-down communication manner. A cut-off valve (103) is provided between the cyclone cylinder (101) and the sand storage cylinder (102). A cyclone is provided inside the cyclone cylinder (101). A first sand discharge port (104) is provided at the bottom of the sand storage cylinder (102). The side wall of the cyclone cylinder (101) is communicated with an inlet pipe (105), and the top of the cyclone cylinder (101) is communicated with an outlet pipe (106).

6. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 5, wherein, The inlet of the inlet pipe (105) and the outlet of the outlet pipe (106) are both arranged lower than the first sand discharge port (104).

7. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 6, wherein The sand storage cylinder (102) is connected to a flushing pipeline (70). The flushing pipeline (70) includes a first branch pipe (701), a second branch pipe (702) and a third branch pipe (703) which are connected in confluence. The first branch pipe (701) is communicated with the inlet pipe (105), the second branch pipe (702) is communicated with the sand storage cylinder (102), the third branch pipe (703) is connected to a liquid supply mechanism, and regulating valves (704) are respectively provided on the first branch pipe (701), the second branch pipe (702) and the third branch pipe (703).

8. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 1, wherein The sand removal and liquid drainage mechanism (20) includes a gas-liquid separation cylinder (201). The gas-liquid separation cylinder (201) is connected to an inlet gas pipeline (202) and an outlet gas pipeline (203). The inlet gas pipeline (202) is communicated above the side wall of the gas-liquid separation cylinder (201), the outlet gas pipeline (203) is communicated with the top of the gas-liquid separation cylinder (201), a second sand discharge port (204) is provided at the bottom of the gas-liquid separation cylinder (201), a liquid discharge port (205) is provided below the side wall of the gas-liquid separation cylinder (201), and the inlet of the inlet gas pipeline (202) and the outlet of the outlet gas pipeline (203) are both arranged lower than the bottom of the gas-liquid separation cylinder (201).

9. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 8, wherein A swirl component (206), a rectifier (207) and a mist supplementer (208) are arranged in the gas-liquid separation cylinder (201). The swirl component (206) is oppositely arranged at the through position of the air inlet pipeline (202) on the gas-liquid separation cylinder (201), and the rectifier (207) and the mist supplementer (208) are arranged above the through position.

10. The integrated system for high-pressure sand removal and liquid drainage at the shale gas wellhead according to claim 9, wherein The air inlet pipeline (202) comprises a plurality of erosion-resistant joints (2021) connected by pipes. The erosion-resistant joint (2021) comprises a forged cubic tee. The air inlet pipeline (202) is provided with a safety valve (209); the erosion-resistant joint (2021) is provided at the second sand discharge port (204).

Images