Separating and desanding combined sledge for natural gas platform

Abstract

The utility model belongs to the technical field of natural gas production equipment, and provides a separation and sand removal combined skid for a natural gas platform, which comprises a main pipeline, a sand removal device and a sand removal device, the separation pipeline comprises a sand remover and a gas-liquid separator; the blow-down pipe is connected with the main pipeline; the first adjusting pipeline is connected with the sand remover and is used for conveying the separated solid-phase particles; the second adjusting pipeline is connected with the gas-liquid separator; and the blow-off pipe is respectively connected with the first adjusting pipeline and the second adjusting pipeline. According to the device, the blow-down pipe, the main pipeline, the separation pipeline, the adjusting pipeline and the blow-off pipe are arranged, in the working process, raw material gas is conveyed into the separation pipeline through the main pipeline, then solid-phase particles and waste liquid in the raw material gas are separated through the separation pipeline, and the solid-phase particles and the waste liquid are discharged through the adjusting pipeline and the blow-off pipe; the quality of natural gas is improved, the production cost is reduced, in addition, redundant gas can be exhausted by using the blow-down pipe when the pressure in the pipeline is too large, and the safety is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas production equipment, in particular to a separation and sand removal combined skid used for a natural gas platform. Background Art

[0002] During natural gas testing and gas production, the high-pressure and high-speed oil and gas flow produced by the wellbore is usually accompanied by solid-phase particulate matter. These solid particles mainly come from weighting materials in high-density drilling fluids lost during drilling, formation sand, rock cuttings, perforation residues, fracturing sand, etc., especially after large-scale sand fracturing of unconventional gas reservoirs such as shale gas, the wellhead pressure is high at the beginning of drainage and more formation sand is produced. These solid-phase particulate matter is carried out by the high-speed fluid in the wellbore, which will cause serious erosion and blockage to the ground testing equipment, pipelines, instruments, etc. used, posing a serious threat to the testing and production safety of natural gas wells. Fluid sand removal is a key problem that needs to be solved urgently in all aspects of natural gas well development and production.

[0003] Installing a desander at the wellhead of a natural gas well can effectively purify solid particles such as formation sand, fracturing sand, and cuttings in the return fluid, protect ground process equipment from erosion by high-speed sand-containing fluids, and create objective economic benefits. Foreign research on well cyclone desanders began in the early 20th century. Well cyclone desanders are more adaptable and can operate without reducing production pressure. However, the existing technology generally requires workers to regularly open the drain valve of the desander sand settling cylinder based on experience to discharge sand particles. For the situation of less sand production, it will cause a waste of manpower. For the situation of unstable sand production, it may cause the sand particles to not be removed in time and enter the separator with gas and water, affecting the stable operation of the subsequent process and greatly increasing the production cost. In addition, although a certain degree of equipment skid-mounted research and application has been carried out in the development of natural gas fields, it is still not perfect. The equipment is still relatively scattered, the functions are not concentrated, the space utilization is not high, the area occupied is large, the on-site construction workload is large, and the installation period is long. It is not adaptable to the situation of large liquid production and large sand production in the early stage of natural gas. Utility Model Content

[0004] In order to solve at least one problem in the background technology, the utility model provides a separation and sand removal combined skid for a natural gas platform.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A separation and sand removal combined skid for a natural gas platform, comprising:

[0007] Main pipeline for transporting raw gas;

[0008] A separation pipeline, comprising a desander and a gas-liquid separator, wherein the desander is connected to the main pipeline and is used to remove solid phase particles in the raw gas, and the gas-liquid separator is connected to the desander and is used to perform gas-liquid separation on the raw gas after the solid phase particles are removed;

[0009] Vent pipe, connected to the main pipeline;

[0010] A first regulating pipeline is connected to the desander and is used to transport the separated solid particles;

[0011] A second regulating pipeline is connected to the gas-liquid separator and is used to transport the separated liquid;

[0012] The sewage pipe is connected to the first regulating pipeline and the second regulating pipeline respectively, and is used to discharge the separated solid particles and liquid.

[0013] Preferably, the separation pipeline further comprises a first separation pipe and a second separation pipe;

[0014] One end of the first separation tube is connected to the desander, and the other end is connected to the gas-liquid separator;

[0015] One end of the second separation tube is connected to the gas-liquid separator.

[0016] Preferably, valves are installed on the main pipeline, the second separation pipe and the vent pipe.

[0017] Preferably, the first regulating pipeline comprises a first branch and a second branch connected in parallel;

[0018] One end of the first branch is connected to the desander, and the other end is connected to the sewage pipe;

[0019] The first branch is sequentially installed with a first electric ball valve and a first electric regulating valve, the first electric ball valve is interlocked with a first double-flange differential pressure level transmitter, and the first electric regulating valve is interlocked with a first magnetostrictive level transmitter;

[0020] The first double-flange differential pressure level transmitter and the first magnetostrictive level transmitter are installed on the desander to detect the liquid level of the desander and give an alarm;

[0021] One end of the second branch is connected to the desander, and the other end is connected to the sewage pipe, and a first manual ball valve and a first manual regulating valve are sequentially installed on the second branch.

[0022] Preferably, a plurality of first flat gate valves are also installed on the first branch;

[0023] At least one first flat gate valve is installed between the first electric ball valve and the first electric regulating valve;

[0024] At least one first flat gate valve is installed at the outlet end of the first electric regulating valve away from the first electric ball valve.

[0025] Preferably, a pressure gauge is installed at the confluence of the first branch and the second branch.

[0026] Preferably, the second regulating pipeline comprises a third branch and a fourth branch connected in parallel;

[0027] One end of the third branch is connected to the gas-liquid separator, and the other end is connected to the sewage pipe;

[0028] The third branch is provided with a second electric ball valve and a second electric regulating valve, the second electric ball valve is interlocked with a second double-flange differential pressure level transmitter, and the second electric regulating valve is interlocked with a second magnetostrictive level transmitter;

[0029] The second double-flange differential pressure level transmitter and the second magnetostrictive level transmitter are installed inside the gas-liquid separator to detect the liquid level of the gas-liquid separator and to give an alarm;

[0030] One end of the fourth branch is connected to the gas-liquid separator, and the other end is connected to the sewage pipe, and a second manual ball valve and a second manual regulating valve are installed on the fourth branch.

[0031] Preferably, a plurality of second flat gate valves are also installed on the third branch;

[0032] At least one second flat gate valve is installed between the second electric ball valve and the second electric regulating valve;

[0033] At least one second flat gate valve is installed at the outlet end of the second electric regulating valve away from the second electric ball valve.

[0034] Preferably, the gas-liquid separator is further connected to a fifth branch, and the outlet end of the fifth branch is connected to a sewage pipe.

[0035] Preferably, a valve is installed on the fifth branch.

[0036] Beneficial effects of the utility model:

[0037] 1. The utility model is provided with a vent pipe, a main pipeline, a separation pipeline, a regulating pipeline and a drain pipe. During operation, the main pipeline transports the raw gas to the separation pipeline, and then the separation pipeline separates the solid particles (such as fracturing corundum) and the waste liquid in the raw gas, and discharges the solid particles and the waste liquid through the regulating pipeline and the drain pipe, thereby improving the quality of natural gas and reducing production costs. In addition, the vent pipe can be used to discharge excess gas when the pressure in the pipeline is too high, thereby improving safety.

[0038] 2. The utility model proposes a separation and sand removal combined skid suitable for natural gas platforms. The solution combines the separator and the sand remover into a skid, and the pipeline is connected by flanges. After being prefabricated into a skid in the factory, it is transported to the site as a whole for connection. The working data parameters in the skid can be transmitted remotely, and the switches of various electric valves can be remotely controlled. The utility model forms an automated, modular integrated equipment system for sand removal and separation, which can be installed once, disassembled according to working conditions, reduce repeated disassembly and assembly, reduce floor space, and avoid redundant equipment waste. In the future, it will be possible to create a sand removal and separation operation mode with unmanned operation, real-time monitoring, remote control, targeted inspection, and unmanned operation for multiple platforms and multiple well groups.

[0039] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 The utility model shows a structural schematic diagram of a separation and sand removal combined skid used for a natural gas platform.

[0042] In the figure: 1, main pipeline; 2, desander; 3, first separation pipe; 4, gas-liquid separator; 5, second separation pipe; 6, vent pipe; 7, sewage pipe; 8, first branch; 9, second branch; 10, third branch; 11, fourth branch; 12, first double flange differential pressure level transmitter; 13, first magnetostrictive level transmitter; 14, first electric ball valve; 15, first electric regulating valve; 16, first flat gate valve; 17, first manual ball valve; 18, first manual regulating valve; 19, second double flange differential pressure level transmitter; 20, second magnetostrictive level transmitter; 21, second electric ball valve; 22, second electric regulating valve; 23, second flat gate valve; 24, second manual ball valve; 25, second manual regulating valve; 26, pressure gauge; 27, fifth branch. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] A separation and sand removal combination skid for a natural gas platform, comprising a main pipeline 1, a separation pipeline, a venting pipeline and a sewage pipeline. The main pipeline 1 is installed at the natural gas inlet and can transport the raw gas in the well. The separation pipeline and the venting pipeline are directly connected to the main pipeline 1, wherein the separation pipeline can separate the solid particles and waste liquid in the raw gas, and then transport the natural gas with the solid particles and waste liquid removed. The venting pipeline can be opened according to the situation. Generally, it can be opened when the pressure in the main pipeline 1 and the separation pipeline and other equipment is too high, and is used to vent the gas inside the pressure vessel in an emergency. The sewage pipeline is connected to the separation pipeline to discharge the solid particles and waste liquid separated by the separation pipeline.

[0045] Combine the following Figure 1 The detailed structure of the separation and sand removal combined skid used in a natural gas platform is described.

[0046] like Figure 1 As shown, the main pipeline 1 is generally connected to the wellhead to transport the raw gas to the separation pipeline. The separation pipeline includes a desander 2 and a gas-liquid separator 4. The desander 2 is a vertical tank body, the upper part of which is connected to the main pipeline 1, and the desander 2 adopts a "cyclone" desandering design, which can achieve continuous desandering and effectively remove solid particles in the raw gas, such as fracturing corundum. The gas-liquid separator 4 is connected to the desander 2 and is a horizontal tank body, which is used to separate the raw gas from the solid particles. In addition, in the separation pipeline, a first separation tube 3 and a second separation tube 5 are used. Among them, one end of the first separation tube 3 is connected to the top of the desander 2, and the other end is connected to the top of the gas-liquid separator 4. One end of the second separation tube 5 is connected to the top of the gas-liquid separator 4, and the other end is connected to the external pipeline.

[0047] It should be noted that Figure 1 The desander 2 and the gas-liquid separator 4 in the separation pipeline are combined into a skid, and the pipelines are connected by flanges. The raw gas from the wellhead enters the separation and desander combination skid, and first enters the vertical desander 2 through the inlet located in the middle and upper part of the desander 2. The "cyclone" desander principle can be used to achieve continuous desandering. The wet gas after preliminary desandering enters the gas-liquid separator 4 through the first separation pipe 3 at the top, and the sand-containing liquid enters the sewage pipeline through the sewage outlet below the desander 2.

[0048] like Figure 1 As shown, the venting pipeline adopts a venting pipe 6, which is connected to the main pipeline 1 and is provided with a valve, which can be opened as needed to vent the gas in the main pipeline 1 and the separation pipeline.

[0049] like Figure 1 As shown, the sewage pipeline includes a first regulating pipeline, a second regulating pipeline and a sewage pipe 7. The first regulating pipeline is connected to the desander 2 for conveying the separated solid particles. The second regulating pipeline is connected to the gas-liquid separator 4 for conveying the separated liquid. The sewage pipe 7 is connected to the first regulating pipeline and the second regulating pipeline respectively for discharging the separated solid particles and liquid.

[0050] Specifically, in the sewage pipeline, the first regulating pipeline includes a first branch 8 and a second branch 9 in parallel. One end of the first branch 8 is connected to the bottom of the desander 2, and the other end is connected to the sewage pipe 7. The first branch 8 is sequentially installed with a first electric ball valve 14 and a first electric regulating valve 15, the first electric ball valve 14 is electrically connected to a first double-flange differential pressure level transmitter 12, and the first electric regulating valve 15 is electrically connected to a first magnetostrictive level transmitter 13. The first double-flange differential pressure level transmitter 12 and the first magnetostrictive level transmitter 13 are installed on the desander 2 to detect the liquid level of the desander 2 and alarm. The second branch 9 shares an inlet and an outlet with the first branch 8, one end is connected to the desander 2, and the other end is connected to the sewage pipe 7, and the second branch 9 is sequentially installed with a first manual ball valve 17 and a first manual regulating valve 18.

[0051] It should be noted that the first regulating pipeline adopts an automatic drainage method to discharge liquid continuously. Among them, the first electric ball valve 14 is linked with the first double flange differential pressure level transmitter 12, and the switch of the first electric ball valve 14 is controlled by the liquid level. When the liquid level is too low, the first electric ball valve 14 is closed, and the desander 2 stops discharging liquid. The first electric regulating valve 15 is linked with the first magnetostrictive liquid level transmitter 13. When the liquid level is high, the opening of the first electric regulating valve 15 increases to speed up the drainage. When the liquid level is low, the opening of the first electric regulating valve 15 decreases to slow down the drainage.

[0052] In addition, a plurality of first flat gate valves 16 are installed on the first branch 8. At least one first flat gate valve 16 is installed between the first electric ball valve 14 and the first electric regulating valve 15; at least one first flat gate valve 16 is installed at the outlet end of the first electric regulating valve 15 away from the first electric ball valve 14.

[0053] It should be noted that in Figure 1There are two first flat gate valves 16, which are respectively installed at the inlet and outlet ends of the first electric regulating valve 15. When the first electric regulating valve 15 fails, the first flat gate valves 16 before and after the regulating valve can be closed at the same time to replace the first electric regulating valve 15.

[0054] It should be further explained that when the first branch 8 is in a closed state, the second branch 9 can be opened by manual adjustment to test the sand discharge function. At the same time, the second branch 9 serves as a spare pipeline so that the pipeline components of the first branch 8 can be replaced.

[0055] In addition, a pressure gauge 26 is installed at the confluence of the first branch 8 and the second branch 9, and the pressure inside the pipeline can be detected in real time through the pressure gauge 26. If the pressure inside the pipeline is too high, the flow of the first branch 8 and the second branch 9 can be regulated. In addition, in some embodiments, a liquid level and pressure display panel can be set to visually observe the current working state of the desander 2, and the measured pressure, liquid level, displacement and other data in the desander 2 can be remotely transmitted and remotely control the electric valve switch.

[0056] Specifically, in the sewage pipeline, the second regulating pipeline includes a third branch 10 and a fourth branch 11 in parallel. One end of the third branch 10 is connected to the bottom of the horizontal gas-liquid separator 4, and the other end is connected to the sewage pipe 7. The third branch 10 is installed with a second electric ball valve 21 and a second electric regulating valve 22, the second electric ball valve 21 is electrically connected to a second double-flange differential pressure level transmitter 19, and the second electric regulating valve 22 is electrically connected to a second magnetostrictive level transmitter 20. The second double-flange differential pressure level transmitter 19 and the second magnetostrictive level transmitter 20 are installed inside the gas-liquid separator 4 to detect the liquid level of the gas-liquid separator 4 and alarm. The fourth branch 11 and the third branch 10 share an inlet and an outlet, one end is connected to the gas-liquid separator 4, and the other end is connected to the sewage pipe 7, and the fourth branch 11 is installed with a second manual ball valve 24 and a second manual regulating valve 25.

[0057] It should be noted that after the wet gas (raw gas after sand removal) enters the gas-liquid separator 4, it is finely separated, and the natural gas enters the pigging outlet valve group skid from the upper part of the gas-liquid separator 4. The separated liquid enters the second regulating pipeline, merges with the second regulating pipeline downstream, and enters the sewage pipe 7. The second electric ball valve 21 is linked with the second double flange differential pressure level transmitter 19. When the liquid level is too low, the ball valve is closed and the gas-liquid separator 4 stops draining. The second electric regulating valve 22 is linked with the second magnetostrictive liquid level transmitter 20. When the liquid level is high, the opening of the second electric regulating valve 22 increases to speed up the drainage. When the liquid level is low, the opening of the second electric regulating valve 22 decreases to slow down the drainage.

[0058] In addition, a plurality of second flat gate valves 23 are installed on the third branch 10. At least one second flat gate valve 23 is installed between the second electric ball valve 21 and the second electric regulating valve 22; at least one second flat gate valve 23 is installed at the outlet end of the second electric regulating valve 22 away from the second electric ball valve 21.

[0059] It should be noted that in Figure 1 There are two second flat gate valves 23, which are respectively located at the inlet and outlet of the second electric regulating valve 22. When the second electric regulating valve 22 fails, the second flat gate valves 23 before and after the second electric regulating valve 22 can be closed at the same time to replace the second electric regulating valve 22.

[0060] In addition, Figure 1 The gas-liquid separator 4 is also connected to a fifth branch 27, and the outlet end of the fifth branch 27 is connected to the sewage pipe 7. Specifically, there are two drainage ports in the gas-liquid separator 4, and the two drainage ports are respectively located at the two ends of the bottom of the gas-liquid separator 4, one of which is connected to the third branch 10 and the fourth branch 11, and the other is connected to the fifth branch 27, and the outlet of the fifth branch 27 is merged with the third branch 10 and the fourth branch 11.

[0061] Furthermore, valves are installed on the main pipeline 1 , the second separation pipe 5 , the vent pipe 6 and the fifth branch 27 .

[0062] It should be noted that the valves on the main pipeline 1, the second separation pipe 5, the vent pipe 6 and the fifth branch 27 can be ball valves or gate valves, and the control method can be electric signal control or manual control.

[0063] Furthermore, the desander 2, the gas-liquid separator 4 and the sewage pipeline of the utility model can be flange-connected through pipelines and can be pre-integrated before on-site installation, which is convenient for transportation and occupies little space.

[0064] 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 make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A separation and sand removal combined skid for a natural gas platform, characterized in that: include: A main pipeline (1) for conveying raw gas; The separation pipeline comprises a desander (2) and a gas-liquid separator (4), wherein the desander (2) is connected to the main pipeline (1) and is used to remove solid phase particles in the raw gas, and the gas-liquid separator (4) is connected to the desander (2) and is used to perform gas-liquid separation on the raw gas after the solid phase particles are removed; A vent pipe (6) connected to the main pipeline (1); A first regulating pipeline connected to the desander (2) for conveying separated solid particles; a second regulating pipeline connected to the gas-liquid separator (4) for conveying the separated liquid; The sewage pipe (7) is connected to the first regulating pipeline and the second regulating pipeline respectively, and is used to discharge the separated solid particles and liquid.

2. A separation and sand removal combined skid for a natural gas platform according to claim 1, characterized in that: The separation pipeline further comprises a first separation pipe (3) and a second separation pipe (5); One end of the first separation tube (3) is connected to the desander (2), and the other end is connected to the gas-liquid separator (4); One end of the second separation tube (5) is connected to the gas-liquid separator (4).

3. The separation and sand removal combined skid for a natural gas platform according to claim 2, characterized in that: Valves are installed on the main pipeline (1), the second separation pipe (5) and the vent pipe (6).

4. The separation and sand removal combined skid for a natural gas platform according to claim 1, characterized in that: The first regulating pipeline comprises a first branch (8) and a second branch (9) connected in parallel; One end of the first branch (8) is connected to the desander (2), and the other end is connected to the sewage pipe (7); A first electric ball valve (14) and a first electric regulating valve (15) are sequentially installed on the first branch (8); the first electric ball valve (14) is interlocked with a first double-flange differential pressure liquid level transmitter (12); and the first electric regulating valve (15) is interlocked with a first magnetostrictive liquid level transmitter (13); The first double-flange differential pressure liquid level transmitter (12) and the first magnetostrictive liquid level transmitter (13) are installed on the desander (2) and are used to detect the liquid level of the desander (2) and generate an alarm; One end of the second branch (9) is connected to the desander (2), and the other end is connected to the sewage pipe (7), and a first manual ball valve (17) and a first manual regulating valve (18) are sequentially installed on the second branch (9).

5. The separation and sand removal combined skid for a natural gas platform according to claim 4, characterized in that: A plurality of first flat gate valves (16) are also installed on the first branch (8); At least one first flat gate valve (16) is installed between the first electric ball valve (14) and the first electric regulating valve (15); At least one first flat gate valve (16) is installed at the outlet end of the first electric regulating valve (15) away from the first electric ball valve (14).

6. A separation and sand removal combined skid for a natural gas platform according to claim 4 or 5, characterized in that: A pressure gauge (26) is installed at the confluence of the first branch (8) and the second branch (9).

7. The separation and sand removal combined skid for a natural gas platform according to claim 1, characterized in that: The second regulating pipeline comprises a third branch (10) and a fourth branch (11) connected in parallel; One end of the third branch (10) is connected to the gas-liquid separator (4), and the other end is connected to the sewage pipe (7); The third branch (10) is provided with a second electric ball valve (21) and a second electric regulating valve (22); the second electric ball valve (21) is interlocked with a second double-flange differential pressure liquid level transmitter (19); and the second electric regulating valve (22) is interlocked with a second magnetostrictive liquid level transmitter (20); The second double-flange differential pressure liquid level transmitter (19) and the second magnetostrictive liquid level transmitter (20) are installed inside the gas-liquid separator (4) and are used to detect the liquid level of the gas-liquid separator (4) and generate an alarm; One end of the fourth branch (11) is connected to the gas-liquid separator (4), and the other end is connected to the sewage pipe (7), and a second manual ball valve (24) and a second manual regulating valve (25) are installed on the fourth branch (11).

8. The separation and sand removal combined skid for a natural gas platform according to claim 7, characterized in that: A plurality of second flat gate valves (23) are also installed on the third branch (10); At least one second flat gate valve (23) is installed between the second electric ball valve (21) and the second electric regulating valve (22); At least one second flat gate valve (23) is installed at the outlet end of the second electric regulating valve (22) away from the second electric ball valve (21).

9. A separation and sand removal combined skid for a natural gas platform according to claim 7 or 8, characterized in that: The gas-liquid separator (4) is also connected to a fifth branch (27), and the outlet end of the fifth branch (27) is connected to a sewage pipe (7).

10. A separation and sand removal combined skid for a natural gas platform according to claim 9, characterized in that: A valve is installed on the fifth branch (27).

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