Uploading device for recovering CNG (compressed natural gas) from shale gas scattered well
By designing an upload device including main prying seat and recycling device, the complex and large land area problems of CNG processing and external transmission equipment in scattered wells are solved, and efficient upload and rapid website construction of CNG gas is achieved, achieving good economic and Environmental benefits.
Patent Information
- Application Number
- CN202420853951.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-23
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-23
AI Technical Summary
It is difficult to quickly build and put into production in the existing technology, and the CNG processing and export of scattered wells have problems such as complex equipment, large area and complex process flow, and it is difficult to efficiently solve the problem of natural gas upload in scattered wells.
An upload device including a main pry seat and a recycling device is designed, which includes a process pipeline, an air discharge system, a filter, a voltage regulator, a heater and a metering device through which the CNG is filtered, regulated and Heat to ensure that the pressure and temperature of the gas meet the requirements.
It realizes efficient upload of CNG gas in scattered well sites, simplifies on-site work, reduces lifting operations, and quickly builds and puts into production, achieving good economic and environmental benefits.
Smart Images
Figure CN222459210U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of CNG loading in scattered shale gas wells, and in particular to a loading device for recovering CNG in scattered shale gas wells. Background Art
[0002] CNG (Compressed Natural Gas) is a clean and efficient energy source with the advantages of economical and flexible transportation and high storage efficiency. CNG has the same components as pipeline natural gas, with methane (CH4) as the main component.
[0003] At present, the processing and export of CNG in scattered wells in China are in the initial stage. Common wellhead gas export methods include wellhead LNG production export and gathering pipeline export. Wellhead LNG production export process equipment is large, the area is large, the process flow is complex, there are many on-site operations, and the labor intensity of workers is high, which makes it difficult to quickly build a station and put it into production. The approval process for gathering pipeline export is cumbersome and the construction investment is large, which also makes it difficult to quickly build a station and put it into production. For the gas produced by scattered wells in remote mountainous areas, CNG processing and export, and uploading at the gathering and transportation station of the gas field, the first station and intermediate station of the long-distance pipeline, and the gate station and distribution station of urban gas, is an important way to export and sell scattered wells at the current stage. CNG uploading equipment is simple, with less hoisting operations and fewer operating personnel. It can respond quickly to the development of scattered wells and put them into production (transfer) operation. Utility Model Content
[0004] The utility model aims to provide a loading device for recovering CNG from scattered shale gas wells which can improve efficiency.
[0005] The utility model is achieved in this way:
[0006] The utility model provides a loading device for recovering CNG from scattered shale gas wells, characterized in that it comprises a main skid seat, on which at least one set of recovery devices is arranged, the recovery device comprises a process pipeline, a gas unloading system, a filter, a pressure regulator, a heater, and a metering device, the air inlet of the gas unloading system is connected to the output port of a tank car, the gas outlet of the gas unloading system is connected to the inlet of the filter on the one hand, and is connected to the tail gas recovery port on the other hand, the preheating inlet of the heater is connected to the outlet of the filter, the preheating outlet is connected to the inlet of the pressure regulator, the outlet of the pressure regulator is connected to the reheating inlet of the heater, the reheating outlet is connected to the external transmission port via the metering device, the reheating outlet is also connected to the venting port, and the heater is also provided with a drain port.
[0007] In some optional implementation schemes, the air inlet pipeline and the external transmission pipeline of the process pipeline are respectively provided with a pneumatic shut-off valve.
[0008] In some optional embodiments, the reheat outlet of the heater is also connected to an online chromatography analyzer and a water dew point analyzer.
[0009] In some optional embodiments, the online chromatograph and the water dew point analyzer are interlocked with the pneumatic shut-off valve of the air intake pipeline, and the air intake pipeline is immediately shut off once the gas quality components are unqualified.
[0010] In some optional embodiments, when the gas unloading pressure of the gas unloading system is lower than a set value, it automatically switches to the tail gas recovery branch.
[0011] In some optional embodiments, the heater is an electrically heated constant temperature water bath.
[0012] In some optional embodiments, a turbine flow meter is provided on the pipeline at the reheat outlet of the heater.
[0013] In some optional implementation schemes, a control skid is further provided, as well as combustible gas detection equipment, video monitoring equipment, and a control cabinet installed on the control skid; the control skid is detachably connected to the main skid; the combustible gas detection equipment, monitoring equipment, and control cabinet are all connected to the distribution cabinet; the monitoring area of the monitoring equipment covers the entire main skid; the monitoring equipment, safety alarm equipment, and each pneumatic emergency shut-off valve are respectively connected to the control cabinet, which obtains monitoring information and controls the on and off of each pipeline by controlling the opening of the pneumatic emergency shut-off valve.
[0014] In some optional embodiments, the main skid seat and the control skid seat have the same structure, and each includes a plurality of main cross beams, a plurality of main longitudinal beams, a plurality of secondary cross beams, a plurality of secondary longitudinal beams and steel plates, the plurality of main cross beams, secondary cross beams, main longitudinal beams and secondary longitudinal beams are arranged at intervals and connected to form a skeleton, and the steel plates are installed on the upper part of the skeleton.
[0015] The beneficial effects of the utility model are as follows: after the CNG gas recovered from scattered wells is transported to the loading station by a tank truck, it is first unloaded by the unloading system in the skid and then enters the filter. After the solid impurities and heavy hydrocarbon components in the CNG are removed, the gas phase enters the heater for preheating. After the preheating is completed, the CNG is pressure-regulated by the pressure regulator, and the pressure-regulated natural gas enters the heater again for heating, and finally forms natural gas with qualified pressure and temperature. The utility model has a simple structure, can be transported and hoisted as a whole, reduces on-site work, and quickly builds stations and puts them into production, which effectively solves the problem of natural gas uploading in scattered well sites and achieves good economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 The figure is a flow chart of a specific embodiment of the utility model.
[0018] Among them: 1. CNG tank truck; 2. Gas unloading system; 3. Air intake emergency shut-off valve; 4. Filter; 5. Electric heating constant temperature water bath; 6. Pressure regulator; 7. Safety valve; 8. Online chromatograph and water dew point analyzer; 9. Turbine flowmeter; 10. External transmission shut-off ball valve; 11. Air intake; 12. External transmission port; 13. Exhaust gas recovery port; 14. Vent port; 15. Local drainage port. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0022] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0023] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0026] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.
[0027] like Figure 1As shown, this embodiment provides a loading device for recovering CNG from scattered shale gas wells, including a main skid, on which at least one set of recovery devices is arranged, the recovery device including process pipelines, a gas unloading system 2, a filter 4, a pressure regulator 6, a heater 5, an online chromatograph and a water dew point analyzer 8 and a metering device, the gas inlet 11 of the gas unloading system 2 is connected to the output port of the tank car 1, the gas outlet of the gas unloading system is connected to the inlet of the filter 4 on one hand, and to the tail gas recovery port 12 on the other hand, the preheating inlet of the heater 5 is connected to the outlet of the filter 4, the preheating outlet is connected to the inlet of the pressure regulator 6, the outlet of the pressure regulator 6 is connected to the reheating inlet of the heater 5, the reheating outlet is connected to the external output port 12 via the metering device, the reheating outlet is also connected to the venting port 14, and the heater is also provided with an on-site drainage port 15. The tail gas recovery port is connected to the tail gas recovery branch, and the venting port 14 is connected to the venting branch. The air inlet pipeline and the external transmission pipeline of the process pipeline are respectively provided with pneumatic shut-off valves (3, 10). The online chromatograph and the water dew point analyzer are interlocked with the pneumatic shut-off valve 3 of the air inlet pipeline. Once the gas quality components are unqualified, the air inlet pipeline is immediately cut off. When the air discharge pressure of the air discharge system is lower than the set value, it automatically switches to the tail gas recovery branch.
[0028] The CNG gas recovered from scattered wells is transported to the loading station by tank trucks, unloaded by the skid-mounted unloading system, and then enters the filter. After the solid impurities and heavy hydrocarbon components in the CNG are removed, the gas phase enters the heater for preheating. After the preheating, the CNG is pressure-regulated by the pressure regulator. The pressure-regulated natural gas enters the heater for heating again, and finally forms natural gas with qualified pressure and temperature.
[0029] Preferably, the heater 5 of the device is an electrically heated constant temperature water bath furnace.
[0030] Preferably, a turbine flow meter 8 is provided on the pipeline of the heater reheat outlet, and a safety valve 7 is provided on the vent branch.
[0031] Preferably, a control skid is also provided, as well as combustible gas detection equipment, video monitoring equipment, and control cabinet installed on the control skid; the control skid is detachably connected to the main skid; the combustible gas detection equipment, monitoring equipment, and control cabinet are all connected to the power distribution cabinet; the monitoring area of the monitoring equipment covers the entire main skid; the monitoring equipment, safety alarm equipment, and each pneumatic emergency shut-off valve are respectively connected to the control cabinet, and the control cabinet obtains monitoring information and controls the on and off of each pipeline by controlling the pneumatic emergency shut-off valve. The main skid and the control skid have the same structure, and each respectively includes a number of main crossbeams, a number of main longitudinal beams, a number of secondary crossbeams, a number of secondary longitudinal beams, and steel plates; the number of main crossbeams, secondary crossbeams, main longitudinal beams, and secondary longitudinal beams are arranged at intervals and connected to form a skeleton, and the steel plates are installed on the upper part of the skeleton.
[0032] The utility model is usually installed in the gathering and transportation station of shale gas field, the first station and intermediate station of long-distance pipeline, the gate station and distribution station of urban gas. The specific working principle is:
[0033] 1. Transportation of shale gas from scattered wells: natural gas at the wellhead - CNG processing - transported to the station by tank trucks.
[0034] The natural gas extracted from the wellhead is produced through on-site CNG production and transported by tank trucks to the gas field's gathering and transportation stations, the first and intermediate stations of long-distance pipelines, and urban gas gate stations and distribution stations, where it is unloaded from trucks and loaded onto the pipeline network.
[0035] 2. Natural gas unloading: tank truck 1—gas unloading system 2—filter 4—heater 5 preheating—pressure regulator 6—heater 5 reheating—metering.
[0036] The CNG gas transported by the tank truck enters the gas unloading system in the skid of this device and then enters the filter for filtration. After the solid impurities and heavy hydrocarbon components in the CNG gas are removed, it enters the heater for preheating. The preheated CNG gas enters the pressure regulator for pressure regulation and adjusts the pressure to the target pressure. The pressure-regulated natural gas enters the heater again for reheating. After the reheating is completed, the qualified natural gas obtained enters the metering device for metering.
[0037] 3. Natural gas uploading: metering device - external transmission pipeline
[0038] The qualified natural gas after pressure regulation and reheating enters the metering device to achieve online metering. The metered natural gas enters the external transmission pipeline 12 and is uploaded through the external transmission pipeline.
[0039] 4. Tank truck tail gas recovery: tail gas recovery system - tail gas recovery compressor - external transmission pipeline
[0040] When the tank truck unloading pressure reaches the set value, the device automatically switches to the exhaust gas recovery branch, and the exhaust gas recovery branch is connected to the exhaust gas recovery compressor. After the exhaust gas is compressed to the target pressure by the exhaust gas recovery compressor, it enters the external transmission pipeline.
[0041] This embodiment is a scale of 5~30×10 4 Nm 3 / d's pry-type high-efficiency shale gas scattered well CNG recovery loading device has been put into use. At present, the device has good performance and is easy to operate. It has effectively solved the problem of natural gas uploading in scattered well sites and achieved good economic and social environmental protection benefits.
[0042] The embodiments described above are part of the embodiments of the utility model, but not all of the embodiments. The detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model claimed for protection, but only represents selected embodiments of the utility model. Based on the embodiments 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.
Claims
1. A loading device for recovering CNG from scattered shale gas wells, characterized in that: The utility model comprises a main skid, on which at least one set of recovery devices is arranged, wherein the recovery devices comprise process pipelines, a gas unloading system, a filter, a pressure regulator, a heater, and a metering device, wherein the air inlet of the gas unloading system is connected to the output port of the tank car, the air outlet of the gas unloading system is connected to the inlet of the filter on one hand, and is connected to the tail gas recovery port on the other hand, the preheating inlet of the heater is connected to the outlet of the filter, the preheating outlet is connected to the inlet of the pressure regulator, the outlet of the pressure regulator is connected to the reheating inlet of the heater, the reheating outlet is connected to the external output port via the metering device, the reheating outlet is also connected to the venting port, and the heater is also provided with a drain port.
2. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 1 is characterized in that: The air inlet pipeline and the external transmission pipeline of the process pipeline are respectively provided with pneumatic shut-off valves.
3. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 2 is characterized in that: The reheat outlet of the heater is also connected to an online chromatographic analyzer and a water dew point analyzer.
4. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 3 is characterized in that: The online chromatograph and water dew point analyzer are interlocked with the pneumatic shut-off valve of the air intake pipeline. Once the gas quality components are unqualified, the air intake pipeline is immediately cut off.
5. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 1 or 2, characterized in that: When the unloading pressure of the unloading system is lower than the set value, it automatically switches to the tail gas recovery branch.
6. The loading device for recovering CNG from scattered shale gas wells according to claim 1 or 2, characterized in that: The heater is an electrically heated constant temperature water bath furnace.
7. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 3 is characterized in that: A turbine flowmeter is provided on the pipeline at the reheat outlet of the heater.
8. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 6 is characterized in that: A control skid is also provided, as well as combustible gas detection equipment, video monitoring equipment and control cabinet installed on the control skid; the control skid is detachably connected to the main skid; the combustible gas detection equipment, video monitoring equipment and control cabinet are all connected to the distribution cabinet; the monitoring area of the video monitoring equipment covers the entire main skid; the video monitoring equipment, safety alarm equipment and each pneumatic emergency shut-off valve are respectively connected to the control cabinet, which obtains monitoring information and controls the on and off of each pipeline by controlling the opening of the pneumatic emergency shut-off valve.
9. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 8 is characterized in that: The main skid seat and the control skid seat have the same structure, and each comprises a plurality of main cross beams, a plurality of main longitudinal beams, a plurality of secondary cross beams, a plurality of secondary longitudinal beams and steel plates. The plurality of main cross beams, secondary cross beams, main longitudinal beams and secondary longitudinal beams are arranged at intervals and connected to form a skeleton, and the steel plates are installed on the upper part of the skeleton.
10. The CNG loading device for recovering CNG from scattered shale gas wells according to claim 1 or 2, characterized in that: When more than two sets of recovery devices are provided, the recovery devices are arranged in parallel.