CN213177697U - Short-flow natural gas gathering and transportation system - Google Patents
Short-flow natural gas gathering and transportation system Download PDFInfo
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- CN213177697U CN213177697U CN202021622358.5U CN202021622358U CN213177697U CN 213177697 U CN213177697 U CN 213177697U CN 202021622358 U CN202021622358 U CN 202021622358U CN 213177697 U CN213177697 U CN 213177697U
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Abstract
The utility model relates to a defeated technical field of natural gas collection, concretely relates to system is failed to short flow natural gas collection. The short-flow natural gas gathering and transferring system is suitable for gas wells with oil and gas co-production, and comprises: the heating and throttling pry block (17) comprises a heating device for heating well fluid produced by the gas well and a throttling unit connected with a well fluid outlet of the heating device and used for throttling; a separator skid (18), the separator skid (18) comprising a production separator (9) connected to the outlet end of the throttling unit by a transfer conduit for gas-liquid separation of the well stream. The utility model discloses a short flow natural gas gathering and transportation system can carry out gas-liquid separation with the well stream thing of oil gas coproduction, reduces the back pressure of well head, improves the productivity of gas well.
Description
Technical Field
The utility model relates to a defeated technical field of natural gas collection, concretely relates to system is failed to short flow natural gas collection.
Background
The gas fields in China are greatly different in geographical and geomorphic conditions, working conditions and media, and have deep abnormally high-temperature, high-pressure and high-yield gas fields, low-permeability and low-gas-production fields distributed in a large area, deep condensate gas fields rich in condensate oil and the like. Aiming at the characteristics of different types of gas fields, various main processes for gathering and transporting mine fields are formed. At present, the wellsite equipment flow adopted in a mine usually has two types, one is a flow for heating natural gas to prevent hydrate formation, and the other is a flow for injecting an inhibitor into the natural gas to prevent the hydrate formation. The wellhead heating process is to arrange a heating furnace at a wellhead to ensure that no hydrate is generated in the process of collecting and transporting well fluid to a gas collecting station through throttling and depressurization. The method for injecting the hydrate inhibitor into the natural gas flowing at the well head aims to prevent the hydrate from freezing and blocking a gas production line due to the temperature reduction of the wellhead high-pressure gas flow in the process of gathering and transporting the wellhead high-pressure gas flow to a gas gathering station or a purification plant.
For gas wells producing condensate, the bottom hole pressure gradually decreases as production continues, and if the bottom hole pressure drops below the condensate pressure, condensate will appear at the bottom hole or in the formation. During natural gas production, condensate in subterranean reservoirs may flow out of the gas well wellhead with the natural gas. Meanwhile, for a gas well with a gas well rotating layer for producing gas, the phenomenon of oil gas co-production is easy to occur in the gas well. In the natural gas gathering and transportation process, the occurrence of a large amount of condensate oil or crude oil can increase the wellhead back pressure of a gas well, influence the production capacity of the gas well, and cause certain pollution and corrosion to natural gas treatment equipment of a downstream gas gathering station. And the well site devices of the two types cannot solve the influence of oil and gas co-production on the natural gas production process.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the increase well head back pressure that the oil gas coproduction that exists among the prior art brought, influencing the technical problem of gas well productivity to provide a short flow natural gas gathering and transportation system, this system can carry out gas-liquid separation with the well flow thing of oil gas coproduction, reduces the back pressure of well head, improves the productivity of gas well.
In order to realize the above-mentioned purpose, the utility model provides a short flow natural gas gathering system is applicable to the gas well of oil gas coproduction, and it includes: the heating throttling pry block comprises a heating device for heating well fluid produced by the gas well and a throttling unit which is connected with a well fluid outlet of the heating device and used for throttling; the separator prying block comprises a production separator which is connected with the outlet end of the throttling unit through a conveying pipeline and is used for carrying out gas-liquid separation on the well fluid.
Preferably, the production separator is a three-phase production separator capable of three-phase separation of oil, gas and water of the well stream.
Preferably, the heating device comprises a natural gas heating furnace and a heating furnace burner connected with the natural gas heating furnace.
Preferably, the short-path natural gas gathering and transportation system comprises a gas inlet unit which enables part of the natural gas separated by the production separator to be transported into the burner of the heating furnace.
Preferably, the gas inlet unit comprises a gas inlet pipeline, two ends of the gas inlet pipeline are respectively connected with the heating furnace burner and the production separator, and a fuel gas filter is arranged on the gas inlet pipeline.
Preferably, the throttling unit comprises an angle valve, an oil nozzle and a throttling stop valve, the angle valve and the oil nozzle are respectively connected with the well fluid outlet, the throttling stop valve is connected with the oil nozzle in series, and the oil nozzle and the throttling stop valve are respectively connected with the angle valve in parallel.
Preferably, the separator pry block comprises a mass flow meter and a first electrically operated valve connected in series, the mass flow meter being connected to the production separator, the first electrically operated valve being arranged to open automatically when the liquid level of an oil chamber within the production separator reaches a preset value.
Preferably, the separator skid comprises a vortex shedding flowmeter and a second electrically operated valve connected in series, the vortex shedding flowmeter being connected to the production separator.
Preferably, the separator skid comprises a pressure detection device disposed between the vortex shedding flowmeter and the production separator; the second electric valve is set to be automatically opened when the value detected by the pressure detection device reaches a preset value.
Preferably, the short-process natural gas gathering and transportation system comprises an emptying unit, and the emptying unit comprises: the emptying pipeline comprises a first pipeline and a second pipeline, one end of the first pipeline is connected with the natural gas heating furnace, one end of the second pipeline is connected with the production separator, and the first pipeline is connected with the second pipeline in parallel; the heating throttling pry safety valve is arranged on the first pipeline; a separator pry relief valve disposed on the second conduit; the heating throttling pry safety valve and the separator pry safety valve are both set to be fixed pressure.
By the technical scheme, the well flow produced by the wellhead of the oil-gas-containing well can be heated by the heating device, so that hydrates are prevented from being generated in the natural gas gathering and transportation process; the heated and output well fluid is throttled by the throttling unit so as to reach proper output pressure, and the throttled well fluid is conveyed into the production separator to carry out gas-liquid separation on the well fluid, so that liquid-phase media such as crude oil or condensate oil are separated from natural gas, the return pressure of a well mouth can be effectively reduced, the production efficiency of the natural gas is improved, and the stability of gas phase gathering and transportation is ensured; the corrosion and pollution of crude oil or condensate to downstream gathering and transportation pipelines and natural gas processing equipment can be reduced, and the processing process flow of a downstream natural gas gathering and transportation processing station is simplified; meanwhile, the single-well yield measurement of crude oil or condensate and natural gas can be realized.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the short-process natural gas gathering and transportation system of the present invention.
Description of the reference numerals
1. A natural gas heating furnace; 2. a heating furnace burner; 3. a self-operated regulating valve; 4. a nozzle tip; 5. a throttle stop valve; 6. an angle valve; 7. heating, throttling and prying the safety valve; 8. a fuel gas filter; 9. a production separator; 10. a mass flow meter; 11. a first electrically operated valve; 12. a vortex shedding flowmeter; 13. a second electrically operated valve; 14. a pressure detection device; 15. the separator pries the safety valve; 16. a fuel gas ball valve; 17. heating the throttling pry block; 18. the separator sled piece.
Detailed Description
In the present invention, the terms "upstream and downstream" are used in terms of the flow direction of the fluid unless otherwise stated.
As shown in fig. 1, the utility model provides a short flow natural gas gathering and transportation system, its gas well that is applicable to oil gas coproduction, short flow natural gas gathering and transportation system is especially to the development production in long-range high oil-containing gas well initial stage and middle period. The short-process natural gas gathering and transporting system is a short-process natural gas gathering and transporting system. The short-process natural gas gathering and transporting system comprises: the heating throttling pry block 17 comprises a heating device for heating well fluid produced by the gas well and a throttling unit connected with a well fluid outlet of the heating device for throttling, and the well fluid outlet is an outlet for outputting the heated well fluid; a separator skid 18, said separator skid 18 comprising a production separator 9 connected to the outlet end of said throttling unit by a transfer pipe for gas-liquid separation of said well stream. The gas-liquid separation means that liquid phase media (condensate oil, crude oil and the like) in well streams (mixtures of natural gas, crude oil, condensate oil and the like) are separated through a production separator 9, and the liquid phase media in the natural gas are removed. In practical application, the short-flow natural gas gathering and transferring system is installed in a natural gas well field.
The system can heat well fluid produced by the wellhead of the oil-gas-containing well through the heating device so as to prevent the generation of hydrates in the natural gas gathering and transportation process; the heated and output well fluid is throttled by the throttling unit so as to reach proper output pressure, and the throttled well fluid is conveyed into the production separator 9 to carry out gas-liquid separation on the well fluid, so that liquid phase media such as crude oil or condensate oil are separated from natural gas, the return pressure of a well mouth can be effectively reduced, the production efficiency of the natural gas is improved, and the stability of gas phase gathering and transportation is ensured; the corrosion and pollution of crude oil or condensate to downstream gathering and transportation pipelines and natural gas processing equipment can be reduced, and the processing process flow of a downstream natural gas gathering and transportation processing station is simplified; meanwhile, the single-well yield measurement of crude oil or condensate and natural gas can be realized.
As an embodiment, the production separator 9 is a three-phase production separator capable of performing a three-phase separation of oil, gas and water of the well stream. The three-phase production separator separates well stream into natural gas, liquid phase oil (crude oil, condensate, etc.), and wastewater. And the sewage separated by the three-phase production separator is discharged into a sewage tank in a well site through a sewage pipeline. For the initial and middle development and production of a high oil-containing gas well, once oil is produced in an oil pipe of the gas well, a two-phase gas-liquid separator is generally arranged at a well site to separate a liquid-phase medium in a gathering and transportation pipeline so as to meet the production requirement.
In one embodiment, the heating device includes a natural gas heating furnace 1 and a heating furnace burner 2 connected to the natural gas heating furnace 1. In practical application, if the summer is hot, the heating can be carried out by adopting a heat tracing mode.
As an embodiment, the short-run natural gas gathering system comprises a gas inlet unit that enables part of the natural gas separated by the production separator 9 to be delivered into the furnace burner 2. Namely, one part of the natural gas separated by the production separator 9 is transmitted to a downstream gathering system or sold on site, and the other part is transmitted to the burner 2 of the heating furnace to be used as fuel gas of the natural gas heating furnace 1. The design improves convenience and the structure is simpler.
In one embodiment, the gas inlet unit comprises a gas inlet pipe connected to the furnace burner 2 and the production separator 9 at both ends, and the gas inlet pipe is provided with a fuel gas filter 8. Specifically, the intake pipe is connected to a natural gas outlet (an outlet for outputting natural gas) of the production separator 9. The fuel gas filter 8 plays a role in filtering and can filter out impurities in the natural gas, so that the natural gas entering the heating furnace burner 2 is relatively pure. Preferably, the air inlet duct is a steel duct.
Preferably, the gas inlet unit further comprises a self-operated regulating valve 3 and a fuel gas ball valve 16, wherein the self-operated regulating valve 3 is arranged at the downstream of the fuel gas filter 8 and close to the heating furnace burner 2, and the fuel gas ball valve 16 is arranged at the upstream of the fuel gas filter 8 and close to the production separator 9. The self-operated regulating valve 3 is arranged in a fixed pressure range to ensure that the pressure of fuel gas entering the burner 2 of the heating furnace is stable. The fuel gas filter 8 and the self-operated regulating valve 3 both belong to the heating throttling pry block 17.
As an embodiment, the throttling unit includes an angle valve 6, a choke 4, and a throttling stop valve 5, the angle valve 6 and the choke 4 are respectively connected to the well fluid outlet, the throttling stop valve 5 is connected in series with the choke 4, the throttling stop valve 5 is located at the downstream of the choke 4, and the choke 4 and the throttling stop valve 5 are respectively connected in parallel with the angle valve 6. The design can throttle the pressure unstable well through the angle valve 6, and can throttle the pressure stable well through the oil nozzle 4 and the throttle stop valve 5, so that the adaptability is improved.
As an embodiment, the separator pry block 18 comprises a mass flow meter 10 and a first electric valve 11 connected in series, the mass flow meter 10 being connected to the production separator 9, the first electric valve 11 being arranged to open automatically when the level of the oil chamber inside the production separator 9 reaches a preset value. The first electric valve 11 is controlled by the control system of the production separator 9 to be automatically opened, so that the first electric valve 11 and the liquid level of the oil chamber of the production separator 9 form interlocking control. The mass flow meter 10 is connected to a liquid phase oil outlet (outlet for outputting crude oil and condensate) of the production separator 9, and the first electric valve 11 is located downstream of the mass flow meter 10. The separated liquid phase oil (crude oil, condensate, etc.) is measured by a mass flow meter 10, and then delivered to an oil storage tank in a well site through a first electric valve 11.
In one embodiment, the separator skid 18 comprises a vortex shedding flowmeter 12 and a second electric valve 13 connected in series, the vortex shedding flowmeter 12 being connected to the production separator 9. The second electro valve 13 is set to a fixed pressure value. The second electrically operated valve 13 is located downstream of the vortex shedding flowmeter 12. Another portion of the natural gas separated from the production separator 9 (i.e. the separated natural gas other than that supplied to the furnace burners 2) is metered by a vortex shedding flowmeter 12 and can be exported via a natural gas pipeline or sold as on-site CNG.
As an embodiment, the separator skid 18 comprises a pressure detection device 14 arranged between the vortex shedding flowmeter 12 and the production separator 9; the second electric valve 13 is arranged to open automatically when the value detected by the pressure detection means 14 reaches a preset value. The second electric valve 13 is controlled by the control system of the production separator 9 to automatically open and regulate the opening of the valve, so that the second electric valve 13 and the pressure detection device 14 form linkage control. The pressure detection device 14 is located upstream of the vortex shedding flowmeter 12 and is connected to the natural gas outlet of the production separator 9.
As an embodiment, the short-process natural gas gathering and transportation system includes a vent unit, and the vent unit includes: the emptying pipeline comprises a first pipeline and a second pipeline, one end of the first pipeline is connected with the natural gas heating furnace 1, one end of the second pipeline is connected with the production separator 9, and the first pipeline and the second pipeline are connected in parallel; the heating throttling pry safety valve 7 is arranged on the first pipeline, and the heating throttling pry safety valve 7 is arranged on the first pipeline; a separator pry relief valve 15, the separator pry relief valve 15 disposed on the second conduit; the heating throttling pry safety valve 7 and the separator pry safety valve 15 are both set to be fixed pressure. The flare conduit also includes a flare end that, in practice, is connected to a flare system at the well site. The heating throttling pry safety valve 7 and the separator pry safety valve 15 are set to be fixed pressure, and normal and stable operation of the heating throttling pry block 17 and the separator pry block 18 can be guaranteed. Wherein, the heating throttling pry safety valve 7 belongs to a heating throttling pry block 17; the separator pry safety valve 15 belongs to a separator pry block 18. Preferably, the emptying pipe is a steel pipe.
During operation, as shown in fig. 1, well flow produced at the wellhead of the natural gas well is heated by a natural gas heating furnace 1, the heated well flow is throttled by an oil nozzle 4 or an angle valve 6, and a throttling stop valve 5 is connected with the oil nozzle 4. The flow paths of the choke 4 and the angle valve 6 are in parallel, and well fluid can be selected to pass through one of the flow paths according to production requirements. When the well stream is throttled to a suitable export pressure, the well stream is sent to a production separator 9 for oil, gas, water separation. The separated sewage is discharged to a sewage tank of a well site through a sewage flow pipeline. The separated crude oil is metered by a mass flowmeter 10 and then discharged into an oil storage tank of a well site under the control of a first electric valve 11. The first electric valve 11 and the liquid level of the oil chamber in the production separator 9 form interlocking control, and when the liquid level in the oil chamber reaches a preset height, the first electric valve 11 can be automatically opened. And metering a part of separated natural gas through a vortex flowmeter, and controlling and conveying the metered natural gas to a downstream gathering and transportation system or selling the metered natural gas on site through a second electric valve 13. The second electro valve 13 is set to a fixed pressure value and is controlled in interlock with the pressure detection device 14. When the pressure detection device 14 reaches a set value, the control system controls the second electric valve 13 to automatically open and adjust the opening of the valve so as to ensure the stability of the gas phase pressure in the production separator 9. And the other separated part of natural gas is conveyed to a fuel gas inlet flow of the natural gas heating furnace 1 through a fuel gas ball valve 16 and an air inlet pipeline, and the natural gas is firstly filtered by a fuel gas filter 8 and then enters a burner 2 of the heating furnace through a self-operated regulating valve 3 for combustion. The system has simple design structure, convenient construction by skid-mounted mode and obvious economic benefit.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical concept of the utility model is within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, for example, can change heating device into electric tracing heating device etc.. Including the combination of the individual specific technical features, in any suitable manner, for example the combination of a two-phase gas-liquid separator with the respective embodiments described above, etc. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (10)
1. The utility model provides a short flow natural gas gathering and transportation system, is applicable to the gas well of oil gas coproduction which characterized in that includes:
the heating and throttling pry block (17) comprises a heating device for heating well fluid produced by the gas well and a throttling unit connected with a well fluid outlet of the heating device and used for throttling;
a separator skid (18), the separator skid (18) comprising a production separator (9) connected to the outlet end of the throttling unit by a transfer conduit for gas-liquid separation of the well stream.
2. The short run natural gas gathering system as defined in claim 1 wherein the production separator (9) is a three phase production separator (9) capable of three phase separation of oil, gas, water of the well stream.
3. The short-flow natural gas gathering and transportation system according to claim 1, wherein the heating device comprises a natural gas heating furnace (1) and a heating furnace burner (2) connected to the natural gas heating furnace (1).
4. Short-run natural gas gathering system according to claim 3, characterized in that it comprises an intake unit enabling the partial natural gas separated by the production separator (9) to be conveyed into the furnace burner (2).
5. The short-flow natural gas gathering and transportation system as claimed in claim 4, wherein the gas inlet unit comprises a gas inlet pipe connected with both ends to the heating furnace burner (2) and the production separator (9), respectively, and a fuel gas filter (8) is disposed on the gas inlet pipe.
6. The short-flow natural gas gathering and transportation system according to claim 1, wherein the throttling unit comprises an angle valve (6), a choke (4) and a throttling stop valve (5), the angle valve (6) and the choke (4) are respectively connected with the well fluid outlet, the throttling stop valve (5) is connected with the choke (4) in series, and the choke (4) and the throttling stop valve (5) are respectively connected with the angle valve (6) in parallel.
7. The short-run natural gas gathering and transportation system according to claim 1, characterized in that the separator pry block (18) comprises a mass flow meter (10) and a first electric valve (11) in series, the mass flow meter (10) being connected with the production separator (9), the first electric valve (11) being arranged to open automatically when the level of the oil chamber inside the production separator (9) reaches a preset value.
8. The short flow natural gas gathering and transportation system as claimed in claim 1, wherein the separator skid (18) comprises a vortex shedding flowmeter (12) and a second electrically operated valve (13) in series, the vortex shedding flowmeter (12) being connected to the production separator (9).
9. The short flow natural gas gathering and transportation system as set forth in claim 8 wherein the separator skid (18) comprises a pressure sensing device (14) disposed between the vortex shedding flowmeter (12) and the production separator (9); the second electric valve (13) is set to automatically open when the value detected by the pressure detection device (14) reaches a preset value.
10. The short run natural gas gathering and transportation system of claim 3 comprising a vent unit, the vent unit comprising:
the emptying pipeline comprises a first pipeline and a second pipeline, one end of the first pipeline is connected with the natural gas heating furnace (1), one end of the second pipeline is connected with the production separator (9), and the first pipeline and the second pipeline are connected in parallel;
the heating throttling pry safety valve (7), wherein the heating throttling pry safety valve (7) is arranged on the first pipeline;
a separator pry relief valve (15), the separator pry relief valve (15) disposed on the second conduit; the heating throttling pry safety valve (7) and the separator pry safety valve (15) are both set to be fixed pressure.
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| CN202021622358.5U CN213177697U (en) | 2020-08-06 | 2020-08-06 | Short-flow natural gas gathering and transportation system |
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| CN202021622358.5U CN213177697U (en) | 2020-08-06 | 2020-08-06 | Short-flow natural gas gathering and transportation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914827A (en) * | 2021-10-22 | 2022-01-11 | 中国石油化工股份有限公司 | Shale oil-gas cluster well platform oil-gas production system and method |
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2020
- 2020-08-06 CN CN202021622358.5U patent/CN213177697U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914827A (en) * | 2021-10-22 | 2022-01-11 | 中国石油化工股份有限公司 | Shale oil-gas cluster well platform oil-gas production system and method |
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