Comprehensive energy-saving system for oil transfer station of oil field

Abstract

The utility model relates to the technical field of oil transfer stations of oil fields, in particular to a comprehensive energy-saving system of an oil transfer station of an oil field, which comprises a refrigerating machine, a heat pump, a natural gas dehumidifying and cooling device, a tail end cooler, a water-water heat exchanger, a flue gas waste heat recovery device and a plurality of matched pipelines, the refrigerating machine and the heat pump are arranged in the area, close to a water inlet pipeline of the heating furnace, in the station, the natural gas dehumidification and cooling device is arranged on a natural gas output pipeline, and the tail end coolers are arranged in a duty room and a pump room. Main waste heat resources in the oil transfer station of the oil field are fully recycled and used for preheating inlet liquid of a heating furnace, the overall energy management and control level in the oil transfer station is effectively improved, the production energy consumption of enterprises is reduced, the waste heat of wet natural gas and indoor air is recycled through an electrically-driven refrigerating machine, a heat pump and other equipment, the production gas consumption is remarkably reduced, and the production cost is reduced. And the electrification level in the station and the operation reliability of related equipment are improved, and the electrification process of the oil field production process is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield transfer stations, in particular to a comprehensive energy-saving system for oilfield transfer stations. Background Art

[0002] In the process of crude oil extraction and gathering and transportation, a large amount of oil and gas resources are usually consumed through transfer stations to provide energy and convenience for the transportation and treatment of crude oil, so as to ensure the normal operation of the entire crude oil extraction process.

[0003] The main energy-consuming equipment in the transfer station is the heating furnace, and the resources it consumes are mainly dry or undried associated petroleum gas. Part of the heat released by fuel combustion is absorbed by the process medium, and the other part is discharged through the chimney in the form of high-temperature waste flue gas, resulting in a certain amount of energy loss.

[0004] At the same time, the temperature of the wet natural gas separated by the natural gas oil separator is around 30°C all year round. The heat of this part of natural gas is not utilized and is transported through the natural gas export pipeline to the downstream oil and gas treatment station. On the one hand, it causes energy waste, on the other hand, it also increases the treatment energy consumption of the downstream treatment process, and at the same time increases the risk of freezing and blocking of the natural gas export pipeline in winter.

[0005] In addition, the temperature in the pump house and the duty room is relatively high in summer, especially in the duty room. It is necessary to cool down through air conditioners to ensure the environmental temperature required for the normal work of the staff. The power consumption is large and the operation cost is high. The high temperature in the pump house is likely to cause the bearing of the pump to overheat, thereby reducing the operation reliability of the pump, and causing waste of the air energy of about 30°C to 40°C in these two parts.

[0006] Based on the above production status of the transfer station, in order to reduce the cost of crude oil extraction and improve the economic and environmental benefits of enterprise production, the present invention analyzes the existing waste heat resources and the heat demand characteristics of heat users in the transfer station, and proposes a comprehensive energy-saving technology for oilfield transfer stations, aiming to fully recover the low-grade waste heat in the station and convert it into medium-grade heat energy available for the oil production process, so as to achieve the goals of reducing production energy consumption, reducing enterprise operation costs, and improving the safety of process production. Content of the Utility Model

[0007] The purpose of the utility model is to solve the above-mentioned disadvantages in the prior art, and to propose a comprehensive energy-saving system for oilfield transfer stations.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] Design an integrated energy-saving system for an oilfield transfer station. The system includes a refrigerating machine, a heat pump, a natural gas dehumidification and cooling device, an end cooler, a water-water heat exchanger, a flue gas waste heat recovery device, a three-in-one oil-containing water pipeline, and a number of supporting pipelines. The refrigerating machine and the heat pump are arranged in the area of the water inlet pipeline near the heating furnace in the station. The natural gas dehumidification and cooling device is arranged on the natural gas export pipeline, and the end cooler is arranged in the duty room and the pump room. The water-water heat exchanger is arranged on the water inlet pipe of the heating furnace. The flue gas waste heat deep recovery device is arranged on the chimney;

[0010] The three-in-one oil-containing water pipeline enters the heat exchange tubes of the flue gas waste heat recovery device. The exhaust gas of the heating furnace enters the outside of the heat exchange tubes of the flue gas waste heat recovery device through the flue. The low-temperature oil-containing water and the high-temperature flue gas complete the heat exchange process through the heat exchange tube wall. After the low-temperature oil-containing water absorbs heat and rises in temperature, it enters the shell side of the water-water heat exchanger through the pipeline. After the high-temperature flue gas releases heat and drops in temperature, it is discharged through the chimney;

[0011] The low-temperature cold water of the refrigerating machine enters the natural gas dehumidification and cooling device and the end cooler through the pipeline respectively. The low-temperature cold water absorbs the heat of the wet natural gas from the natural gas oil separator through the natural gas dehumidification and cooling device, and the low-temperature cold water absorbs the heat of the air in the office and the pump room through the end cooler. The low-temperature cold water that has absorbed heat and risen in temperature after coming out of the natural gas dehumidification and cooling device and the end cooler converges and then enters the evaporator of the refrigerating machine through the pipeline. After the low-temperature cold water releases heat and drops in temperature in the evaporator of the refrigerating machine, it enters the natural gas dehumidification and cooling device and the end cooler through the pipeline again to start the next cycle of heat exchange process;

[0012] The cooling water coming out of the condenser of the refrigerating machine enters the evaporator of the heat pump. After the cooling water releases heat and drops in temperature in the evaporator of the heat pump, it returns to the condenser of the refrigerating machine through the pipeline to absorb the heat of the refrigerant. After the cooling water absorbs heat and rises in temperature, it enters the evaporator of the heat pump through the pipeline again to start the next cycle process;

[0013] The hot water coming out of the condenser of the heat pump enters the tube side of the water-water heat exchanger through the pipeline. The oil-containing water coming out of the flue gas waste heat recovery device enters the shell side of the water-water heat exchanger through the pipeline. The hot water and the oil-containing water complete the heat exchange process in the water-water heat exchanger. After the oil-containing water absorbs heat and rises in temperature, it enters the heating furnace through the pipeline and continues to rise to the temperature required by the process. The hot water in the tube side releases heat and drops in temperature and then returns to the condenser of the heat pump through the pipeline to absorb the heat of the heat medium. After the hot water absorbs heat and rises in temperature, it enters the tube side of the water-water heat exchanger again to start the next cycle of heat exchange process.

[0014] Specifically, the water-water heat exchanger adopts an online automatic cleaning and anti-blocking design.

[0015] Specifically, the natural gas dehumidification and cooling device is equipped with a natural gas condensate recovery system, and the condensate recovery system is equipped with a natural gas condensate recovery pump.

[0016] Specifically, the flue gas waste heat recovery device adopts condensation heat recovery technology.

[0017] Specifically, both the refrigerating machine and the heat pump adopt electric drive mode.

[0018] The design scheme proposed by the present utility model has the following beneficial effects during the application process:

[0019] 1. It realizes the full recovery of the main waste heat resources in the oilfield transfer station, which is used to preheat the liquid entering the heating furnace, effectively improves the overall energy control level in the transfer station, and reduces the production energy consumption of the enterprise.

[0020] 2. The equipment such as the electric-driven refrigerating machine and heat pump recover the waste heat of wet natural gas and indoor air, which not only saves the production gas consumption, but also improves the electrification level in the station, and is conducive to promoting the electrification process of the oilfield production process.

[0021] 3. This technology comprehensively considers the energy consumption situation and energy utilization characteristics of each point in the station, and optimizes and reorganizes the energy supply and demand relationship of the whole station by using existing mature technologies and products, thus maximizing the reduction of the energy consumption level in the oil production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic flow chart of the energy-saving system of the present utility model.

[0023] In the figure: 1. Metering room; 2. Three-in-one oil-containing water pipeline; 3. Natural gas oil separator; 4. External transmission oil pump; 5. Natural gas condensate recovery pump; 6. Natural gas dehumidification and cooling device; 7. Oil and gas treatment station; 8. Flue gas waste heat recovery device; 9. Chimney; 10. Heating furnace; 11. Water-water heat exchanger; 12. Heat pump; 13. Refrigerating machine; 14. Terminal cooler; 15. Duty room; 16. Pump house. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0025] Refer to Figure 1, an integrated energy-saving system for an oilfield transfer station, which includes a refrigerating machine 13, a heat pump 12, a natural gas dehumidification and cooling device 6, a terminal cooler 14, a water-water heat exchanger 11, a flue gas waste heat recovery device 8, a three-in-one oil-containing water pipeline 2 and a number of supporting pipelines. The refrigerating machine 13 and the heat pump 12 are arranged in the area of the water inlet pipeline near the heating furnace 10 in the station. The natural gas dehumidification and cooling device 6 is arranged on the natural gas export pipeline, and the terminal cooler 14 is arranged in the duty room 15 and the pump room 16. The water-water heat exchanger 11 is arranged on the water inlet pipe of the heating furnace 10, and the flue gas waste heat deep recovery device 8 is arranged on the chimney 9;

[0026] The oil-containing water in the three-in-one oil-containing water pipeline 2 enters the heat exchange tubes of the flue gas waste heat recovery device 8 through the pipeline. The exhaust gas of the heating furnace 10 enters the outside of the heat exchange tubes of the flue gas waste heat recovery device 8 through the flue. The low-temperature oil-containing water and the high-temperature flue gas complete the heat exchange process through the heat exchange tube wall. After the low-temperature oil-containing water absorbs heat and rises in temperature, it enters the shell side of the water-water heat exchanger through the pipeline. After the high-temperature flue gas releases heat and drops in temperature, it is discharged through the chimney 9;

[0027] The low-temperature cold water coming out of the evaporator of the refrigerating machine 13 enters the natural gas dehumidification and cooling device 6 and the terminal cooler 14 respectively through the pipeline. A part of the low-temperature cold water absorbs the heat of the wet natural gas coming out of the natural gas oil separator 3 through the natural gas dehumidification and cooling device 6, and another part of the low-temperature cold water absorbs the heat of the air in the office 15 and the pump room 16 through the terminal cooler 14. The low-temperature cold water that has absorbed heat and risen in temperature from the natural gas dehumidification and cooling device 6 and the terminal cooler 14 converges and then enters the evaporator of the refrigerating machine 13 through the pipeline. After the low-temperature cold water releases heat and drops in temperature in the evaporator of the refrigerating machine 13, it enters the natural gas dehumidification and cooling device 6 and the terminal cooler 14 again through the pipeline to start the next cycle of heat exchange process;

[0028] The cooling water coming out of the condenser of the refrigerating machine 13 enters the evaporator of the heat pump 12. After the cooling water releases heat and drops in temperature in the evaporator of the heat pump 12, it returns to the condenser of the refrigerating machine 13 through the pipeline to absorb the heat of the refrigerant. After the cooling water absorbs heat and rises in temperature, it enters the evaporator of the heat pump 12 again through the pipeline to start the next cycle process;

[0029] The hot water coming out of the condenser of the heat pump 12 enters the tube side of the water-water heat exchanger 11 through the pipeline. The oil-containing water coming out of the flue gas waste heat recovery device 8 enters the shell side of the water-water heat exchanger 11 through the pipeline. The hot water and the oil-containing water complete the heat exchange process in the water-water heat exchanger 11. After the oil-containing water absorbs heat and rises in temperature through the water-water heat exchanger 11, it enters the heating furnace 10 through the pipeline and continues to rise to the temperature required by the process. The hot water in the tube side releases heat and drops in temperature and then returns to the condenser of the heat pump 12 through the pipeline to absorb the heat of the heat medium. After the hot water absorbs heat and rises in temperature, it enters the tube side of the water-water heat exchanger 11 again to start the next cycle of heat exchange process.

[0030] Further, it should be noted that the water-water heat exchanger 11 adopts an on-line automatic cleaning and anti-blocking design to prevent the fouling and blockage of the outer wall of the pipe by the oily sewage, thereby affecting the heat exchange effect.

[0031] Further, it should be noted that the natural gas dehumidification and cooling device 6 is equipped with a natural gas condensate recovery system, which mainly consists of a natural gas condensate recovery pump 5 and a pipeline system. The condensate in the natural gas is regularly or continuously recovered to the inlet pipeline of the external transmission oil pump 4 and transported as external transmission oil.

[0032] Further, it should be noted that the flue gas waste heat recovery device 8 adopts the condensation heat recovery technology to deeply recover the sensible heat and latent heat of the flue gas discharged from the heating furnace, maximize the utilization efficiency of the gas, and reuse all the flue gas condensate water as the furnace water scale inhibitor to avoid environmental pollution.

[0033] Further, it should be noted that both the refrigerating machine 13 and the heat pump 12 adopt the electric drive mode, significantly reducing the gas consumption and promoting the process of replacing gas with electricity in oilfield production.

[0034] Specific operation mode: The flue gas waste heat recovery device 8 operates all year round, the natural gas dehumidification and cooling device 6 operates all year round, the terminal cooler 14 operates in the non-heating season, and the terminal cooler 14 stops operating in the heating season.

[0035] Comprehensive advantages: The comprehensive energy-saving technology for oilfield transfer stations described in the present invention can deeply recover the waste heat of the flue gas discharged from the heating furnace to preheat the liquid entering the heating furnace, thereby achieving the goal of improving the gas utilization efficiency and reducing the production energy consumption;

[0036] The comprehensive energy-saving technology for oilfield transfer stations described in the present invention reduces the temperature and moisture content of the externally transmitted natural gas, fully recovers the waste heat of the externally transmitted natural gas to preheat the liquid entering the heating furnace. On the one hand, it realizes the goal of preventing freezing and blockage of the externally transmitted natural gas pipeline in winter, and on the other hand, it reduces the gas consumption of the heating furnace and the production cost;

[0037] The comprehensive energy-saving technology for oilfield transfer stations described in the present invention effectively recovers the air heat of the duty room and the pump room in the non-heating season to preheat the liquid entering the heating furnace. On the one hand, it ensures a suitable environmental temperature in the pump room and improves the use reliability of components such as pump bearings, and on the other hand, it reduces the summer air-conditioning operation cost of the duty room, while reducing the gas consumption of the heating furnace and effectively reducing the production operation cost of the enterprise.

[0038] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. An integrated energy-saving system for an oil field oil transfer station, characterized in that: The system comprises a refrigerator (13), a heat pump (12), a natural gas dehumidification and cooling device (6), a terminal cooler (14), a water-to-water heat exchanger (11), a flue gas waste heat recovery device (8), a three-in-one oil-water pipeline (2) and a plurality of matching pipelines, wherein the refrigerator (13) and the heat pump (12) are arranged in an area of ​​the station close to the water inlet pipeline of the heating furnace (10), the natural gas dehumidification and cooling device (6) is arranged on the natural gas transmission pipeline, and the terminal cooler (14) is arranged in the duty room (15) and the pump room (16), the water-to-water heat exchanger (11) is arranged on the water inlet pipe of the heating furnace (10), and the flue gas waste heat recovery device (8) is arranged on the chimney (9); The three-in-one oil-water pipeline (2) enters the heat exchange tube of the flue gas waste heat recovery device (8), and the exhaust smoke of the heating furnace (10) enters the outside of the heat exchange tube of the flue gas waste heat recovery device (8) through the flue; The low-temperature cold water from the evaporator of the refrigerator (13) enters the natural gas dehumidification and cooling device (6) and the terminal cooler (14) through pipelines respectively; the low-temperature cold water from the natural gas dehumidification and cooling device (6) and the terminal cooler (14) after absorbing heat and heating is combined and enters the evaporator of the refrigerator (13) through pipelines; The cooling water from the condenser of the refrigerator (13) enters the evaporator of the heat pump (12), and the water from the evaporator of the heat pump (12) enters the condenser of the refrigerator (13) through a pipeline; The hot water from the condenser of the heat pump (12) enters the tube side of the water-to-water heat exchanger (11) through a pipeline, and the oily water from the flue gas waste heat recovery device (8) enters the shell side of the water-to-water heat exchanger (11) through a pipeline; The water coming out of the tube side of the water-to-water heat exchanger (11) enters the condenser of the heat pump (12) through a pipeline, and the oil-containing water coming out of the shell side of the water-to-water heat exchanger (11) enters the heating furnace (10) through a pipeline.

2. The comprehensive energy-saving system for oil field oil transfer station according to claim 1 is characterized by: The water-to-water heat exchanger (11) adopts an online automatic cleaning and anti-blocking design.

3. The comprehensive energy-saving system for oil field oil transfer station according to claim 1 is characterized by: The natural gas dehumidification and cooling device (6) is equipped with a natural gas condensate recovery system, and the condensate recovery system is equipped with a natural gas condensate recovery pump (5).

4. The comprehensive energy-saving system for oil field oil transfer station according to claim 1 is characterized by: The flue gas waste heat recovery device (8) adopts condensation heat recovery technology.

5. The comprehensive energy-saving system for oil field oil transfer station according to claim 1 is characterized by: The refrigerator (13) and the heat pump (12) are both electrically driven.

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