CN115182711A - Carbon-emission-free self-powered high-temperature multi-component mixed-phase flow-flooding intelligent system for oil field - Google Patents
Carbon-emission-free self-powered high-temperature multi-component mixed-phase flow-flooding intelligent system for oil field Download PDFInfo
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- CN115182711A CN115182711A CN202210906550.4A CN202210906550A CN115182711A CN 115182711 A CN115182711 A CN 115182711A CN 202210906550 A CN202210906550 A CN 202210906550A CN 115182711 A CN115182711 A CN 115182711A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses an oil field carbon emission-free self-powered high-temperature multi-component mixed-phase flow drive intelligent system. The multi-component mixed-phase flow driving intelligent system generates flue gas and waste heat through a generator of an internal combustion engine, firstly, cooled flue gas and steam are obtained through a heat exchanger, and secondly, the content of each component of the flue gas is ensured to be in a specified range through a flue gas component adjusting device; then purifying the flue gas by using a flue gas purification device; directly carrying out nitrogen reduction on an air system at the front end of the steam generating device through a nitrogen reduction device; finally, the flue gases after each treatment are injected into the injection well by means of a flue gas transport device. The intelligent system can safely inject the flue gas generated during the working of the traditional boiler for thermal recovery of the oil field into the ground according with the standard under the condition of not depending on the large amount of electric energy supplied from the outside, thereby fundamentally solving the discharge problem of the traditional boiler for thermal recovery of the oil field on the premise of ensuring lower comprehensive operation cost and realizing the beneficial effect of high-temperature multi-component mixed-phase flow on the oil reservoir.
Description
Technical Field
The invention relates to an oil field carbon emission-free self-powered high-temperature multi-component mixed-phase flow-drive intelligent system, and belongs to the technical field of oil field application thermal recovery.
Background
The oil field thermal recovery technology is that a certain amount of steam is injected into an oil layer through an oil field well to improve the temperature of the oil layer and increase the pressure of the oil layer, so that the viscosity reduction and pressurization of crude oil in an oil reservoir are achieved, and the production of the crude oil in the oil reservoir is realized. The main facility for steam generation is a boiler, which burns fossil fuel and heats water to evaporate, thereby generating steam.
Conventional boiler systems must produce carbon dioxide after burning fossil fuels, which is released to the atmosphere, i.e., creating "carbon emissions". The carbon emission amount of the part is very large, and statistical data shows that the carbon emission generated by thermal recovery in the main heavy oil thermal recovery production area of China exceeds 1200 ten thousand tons per year, accounts for more than 0.12 percent of the total carbon emission of China, causes huge pressure on the environment and wastes huge carbon dioxide resources.
Some enterprises have proposed some solutions, such as building a boiler carbon dioxide capture system to capture and purify the carbon dioxide generated by boiler combustion for utilization. However, in the existing scheme, the carbon dioxide capture system and the boiler are relatively low in relevance and high in cost. How to solve the problems of discharge and benefit of the traditional boiler for thermal recovery in oil field is an urgent problem to be solved by the technical personnel in the field at present
Disclosure of Invention
The invention aims to provide an intelligent carbon emission-free high-temperature multi-component miscible phase flow flooding system for an oil field, which aims to solve the emission problem and benefit of the traditional boiler for thermal recovery of the oil field and the problem of power grid dependence in the process of injecting high-temperature multi-component miscible phase flow flooding.
The invention firstly provides an oil field carbon emission-free high-temperature multi-component mixed-phase flow drive intelligent system, which comprises:
a steam generating device (1) which generates oil field steam and flue gas;
a flue gas component adjusting device for controlling the content of the flue gas component at the flue gas discharge end of the steam generating device (1);
a flue gas purification device (8) which is sequentially arranged at the rear end of the flue gas component adjusting device and purifies the flue gas;
the nitrogen reducing device (2) is used for adjusting the nitrogen content in the pipeline of the steam generating device (1);
and the flue gas conveying device is used for injecting the purified flue gas into the injection well.
The invention further provides an oil field carbon emission-free self-powered high-temperature multi-component miscible phase flow flooding intelligent system, which comprises:
an internal combustion engine generator (1') which generates power while generating flue gas and forms waste heat; the electric power generated by the internal combustion engine generator (1') is output to a power distribution device of the oil field carbon-emission-free self-powered high-temperature multi-component mixed-phase flow-driving intelligent system through a power cable, so that sufficient electric power is provided for equipment with large electric quantity demand of the system, such as an air compressor, a water system, a denitrification system and the like;
a heat exchanger (44) for exchanging heat with the flue gas generated by the internal combustion engine generator (1') to obtain cooled flue gas and steam;
the flue gas component adjusting device controls the content of the flue gas components discharged from the flue gas outlet of the heat exchanger (44);
a flue gas purification device (8) which is sequentially arranged at the rear end of the flue gas component adjusting device and purifies the flue gas;
the nitrogen reduction device (2) is used for adjusting the nitrogen content in a pipeline of the internal combustion engine generator (1');
and the flue gas conveying device is used for injecting the purified flue gas into the injection well.
In the multi-component mixed-phase flow-drive intelligent system, the internal combustion engine generator (1') generates power by using fuel oil (diesel oil, gasoline, heavy oil, crude oil or biodiesel) or fuel gas (natural gas, marsh gas, coal gas or biogas) and simultaneously generates flue gas and forms waste heat. Generally, the fuel energy in the system of the invention is different according to the internal combustion engine, the electric energy conversion rate is between 28% and 50%, the rest energy exists in the form of heat, and the heat can be injected underground by steam required for heat injection generated by a heat exchange device; in the later stage of the electric energy part, the electric energy part passes through the air compressor, the high-pressure water pump, the oil pump and other electric facilities again to finally enter the stratum in the form of elastic energy or heat energy through the injection flow, so that theoretically, the system does not have large energy loss.
In the multi-component mixed-phase flow drive intelligent system, a front-end smoke port of the heat exchanger (44) is connected with an exhaust pipe of the internal combustion engine generator (1') through a smoke pipeline (15);
the front end water inlet of the heat exchanger (44) is connected with a cooling and heat exchanging system of an internal combustion engine generator (1') through a hot water steam pipeline (14-1);
the rear end smoke outlet of the heat exchanger (44) is connected with a smoke reflux distribution device (7) through a smoke pipeline (15-1);
the rear end steam outlet of the heat exchanger (44) is connected with the confluence device 11 through a steam pipeline 14.
In the multi-component mixed-phase flow-driving intelligent system, the flue gas component adjusting device comprises a flue gas reflux distribution device (7) which is arranged at the discharge end of the steam generating device (1) or the flue gas outlet end of the heat exchanger (44) and used for controlling the flow direction of the flue gas;
the flue gas monitoring device (24) is arranged at the rear end of the flue gas backflow distribution device (7) and is used for monitoring the component content of the flue gas;
and the controller (12) is linked with the smoke backflow distribution device (7), the smoke monitoring device (24), the air system (3) and the fuel system (4) and sends adjusting signals to the smoke backflow distribution device (7), the air system (3) and the fuel system (4) when the content of the flue gas components exceeds a threshold value.
In the multi-component mixed-phase flow drive intelligent system, the flue gas monitoring device (24) monitors residual oxygen and carbon monoxide in the flue gas, and sends a starting signal to the controller (12) when the residual oxygen content exceeds 1.2%;
the nitrogen reducing device (2) is arranged at the rear end of the flue gas purification device (8) and is used for separating and purifying nitrogen in the flue gas;
the nitrogen reducing device (2) is arranged at the front end of the air system (3) and is used for separating nitrogen in the air system (3).
In the multi-component mixed-phase flow flooding intelligent system, the flue gas conveying device comprises a confluence device (11) which is respectively connected with a steam outlet of the steam generating device (1) or a steam outlet of the heat exchanger (44) and a flue gas outlet of the flue gas purifying device (8), and the formed high-temperature multi-component mixed-phase flow is injected into an injection well.
In the multi-component miscible flooding intelligent system, the multi-component miscible flooding intelligent system also comprises an auxiliary agent device (6) which is communicated with the confluence device (11) to inject reservoir auxiliary agent.
In the multi-component mixed-phase flow driving intelligent system, the multi-component mixed-phase flow driving intelligent system also comprises a flue gas pressurizing device (9) which is arranged at the rear end of the flue gas purifying device (8) and used for pressurizing the purified flue gas to a rated pressure value.
In the multi-component mixed-phase flow flooding intelligent system, the multi-component mixed-phase flow flooding intelligent system further comprises a smoke distribution device (10) which is sequentially arranged between the smoke pressurization device (9) and the confluence device (11), and an outlet of the smoke distribution device (10) is also connected with an injection well.
In the multi-component mixed-phase flow drive intelligent system, the steam generating device (1) is a coal-fired boiler, and on the basis of the original coal-fired boiler, a part of steam is used for driving a steam turbine generator set to generate electricity to solve the problem of electric power, so that the self-generating function of the mixed-phase flow drive system is realized.
In addition, a combined gas turbine generator can be used for replacing an internal combustion engine generator (1'), and the capacity of self-generating and heat-injecting of the mixed-phase flow driving system can also be realized.
The working process of the oil field carbon emission-free high-temperature multi-component miscible flooding intelligent system is as follows:
the steam generating device generates steam and flue gas for the oil field, and firstly, the content of each component of the flue gas discharged from the tail end of the steam generating device is ensured to be in a specified range through the flue gas component adjusting device; secondly, purifying the flue gas by using a flue gas purification device; reducing the nitrogen content in the flue gas by using a nitrogen reduction device, or directly reducing the nitrogen of an air system at the front end of the steam generation device by using the nitrogen reduction device; finally, the flue gases after each treatment are injected into the injection well by means of a flue gas transport device.
The working process of the oil field carbon emission-free self-powered high-temperature multi-component mixed-phase flow-drive intelligent system comprises the following steps:
the internal combustion engine generator generates flue gas and waste heat, firstly, cooled flue gas and steam are obtained through the heat exchanger, and secondly, the content of each component of the flue gas is ensured to be in a specified range through the flue gas component adjusting device; then purifying the flue gas by using a flue gas purification device; directly carrying out nitrogen reduction on an air system at the front end of the steam generating device through a nitrogen reduction device; finally, the treated flue gases are injected into the injection well by means of a flue gas transport device.
Through the intelligent system, the heat and the flue gas required by the thermal recovery of the oil field can be safely injected into the ground according with the standard under the condition of not depending on the supply of huge amount of electric energy from the outside, so that the problems of emission and energy consumption of the traditional boiler for thermal recovery of the oil field are fundamentally solved on the premise of ensuring lower comprehensive operation cost, and the beneficial effect of high-temperature multi-component mixed-phase flow on the oil reservoir is realized.
Drawings
Fig. 1 is a schematic structural diagram of an oil field carbon emission-free high-temperature multi-component miscible flooding intelligent system provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of an oilfield carbon emission-free self-powered high-temperature multi-component miscible flooding intelligent system provided in embodiment 2 of the present invention.
The respective symbols in the figure are as follows:
1 internal combustion engine generator, 1' internal combustion engine generator, 2 nitrogen reduction device, 3 air system, 4 fuel system, 5 water supply system, 6 auxiliary agent system, 7 flue gas reflux flow splitting device, 8 flue gas purification device, 9 flue gas supercharging device, 10 flue gas distribution device, 11 confluence device, 12 controller, 13 ash collecting and processing device, 14 steam pipeline, 14-1 hot water steam pipeline, 15, 16 atmospheric pressure crude flue gas pipeline, 17 atmospheric pressure purified flue gas pipeline, 18, 19, 20-1, 20-y high pressure purified flue gas pipeline, 21 auxiliary agent pipeline, 22 high temperature mixed phase flow pipeline, 23 flue gas cooling circulating water pipeline, 24 flue gas monitoring device, 24-1 crude flue gas analysis signal flow cable, 25 fuel control signal cable, 26 air supply control signal cable, 27 flue gas reflux pipeline, 27-1 flue gas control signal cable, 28 nitrogen reduction air pipeline, 29 air pipeline, 30 fuel pipeline, 31 water pipeline, 32 repurification residual ash channel, 33 main ash channel, 34 resource external injection well transportation channel, 35 resource external injection well, 36 flue gas oil layer, oil pipe 37, 38 casing, 40 injection well, 40 injection well connector, 50 and injection well connector.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
Embodiment 1, carbon emission-free high-temperature multi-component mixed-phase flow-drive intelligent system for oil field
As shown in fig. 1, the intelligent carbon emission-free high-temperature multi-component mixed-phase flow flooding system for oil fields provided by the invention comprises: the device comprises a flue gas generating device 1, a flue gas component adjusting device, a flue gas purifying device 8, an ash and slag collecting and processing device 13, a nitrogen reducing device 2, a flue gas supercharging device 9, a flue gas distributing device 10, a confluence device 11 and an auxiliary agent device 6.
In particular, the flue gas generating device 1 is used for generating oilfield steam and flue gas. The flue gas component adjusting device comprises a flue gas backflow distributing device 7, the input end of the flue gas backflow distributing device is connected with the steam generating device 1 through a normal-pressure crude flue gas pipeline 15, the output end of the flue gas backflow distributing device is connected with the air system 3 through a backflow flue gas pipeline 27, the flue gas backflow distributing device 7 is connected with the flue gas purifying device 8 through a normal-pressure crude flue gas pipeline 16, the flow direction of flue gas is controlled according to the mixed gas proportion requirement of the air system 3, and part of flue gas is sent to the air system 3; the flue gas monitoring device 24 is arranged in the normal-pressure crude flue gas pipeline 16 and is used for monitoring the contents of oxygen and carbon monoxide in flue gas in real time and sending a starting signal to the controller when the content of the oxygen in the flue gas exceeds 1 percent; the system also comprises a controller 12 which is connected with the smoke monitoring device 24 through a crude smoke analysis signal flow cable 24-1, connected with the smoke backflow distribution device 7 through a backflow smoke control cable 27-1, connected with the fuel system 4 through a fuel control signal cable 25 and connected with the air system 3 through an air supply control signal cable 26; when the controller 12 receives the starting signal, the controller sends adjusting signals to the smoke backflow distribution device 7, the air system 3 and the fuel system 4 so as to control the residual oxygen content of the smoke at the smoke discharge end of the steam generating device 1 to be within 1.2 percent.
Specifically, the flue gas purification device 8 is connected with a normal-pressure crude flue gas pipeline 16 for removing dust, sulfur, temperature and moisture from flue gas in the pipeline, and the flue gas purification device 8 is connected with the water supply system 5 through a flue gas cooling circulating water pipeline 23.
Specifically, the ash collection processing device 13, which is connected to the flue gas cleaning device 8 through the re-cleaning residual ash passage 32, is connected to the steam generating device 1 through the main ash passage 33; the ash collecting treatment device 13 collects the ash from the steam generation device 1 and the flue gas purification device 8, and takes the ash as a resource to be transported out from the resource ash outward-conveying channel 34; the ash collecting processing device 13 is only arranged when a coal-fired boiler is selected, and the ash collecting processing device 13 is not arranged when the fuel of the boiler is oil or natural gas.
Specifically, the nitrogen reduction device 2 may be a conventional membrane oxygen generator or a pressure swing adsorption oxygen generator, which obtains air from an open atmosphere environment, partially or totally separates nitrogen and discharges the separated nitrogen into the atmosphere, the remaining part is nitrogen reduction air with higher oxygen concentration, the part of the air enters the air system 3 through the nitrogen reduction air pipeline 28, and the air system 3 mixes the nitrogen reduction air and crude flue gas from the air supply device 7 according to a required ratio and sends the mixture into the combustion chamber of the steam generation device 1 through the air pipeline 29.
Specifically, the flue gas supercharging device 9 is connected with the flue gas purification device 8 through a normal pressure purification flue gas pipeline 17, and pressurizes the purified flue gas to a rated pressure value. The flue gas supercharging device 9 is an air compressor.
Specifically, the input end of the flue gas distribution device 10 is connected with the flue gas supercharging device 9 through a high-pressure purified flue gas pipeline 18, the device is composed of two to a plurality of flow control valves, one of the control valves sends part or all of the flue gas to the confluence device 11 through a high-pressure purified flue gas pipeline 19, the other part of the control valves controls the injection well oil pipe joint 40 which is used for distributing a set amount of flue gas and is connected to the flue gas injection well 36 through a high-pressure purified flue gas pipeline 20-1, the flue gas is injected into the underground through an oil pipe 38, and the flue gas is mainly carbon dioxide and part of nitrogen gas, so that the energy increasing and viscosity reducing effects of the mixed gas of the carbon dioxide and the nitrogen gas are exerted on an underground oil layer 37 after the flue gas is injected into the underground, and the oil production capacity of oil reservoir is improved; the flue gas distribution device 10 also has a part of a control valve for distributing a set amount of said flue gas to be injected downhole via an injection well casing connection 41 connected to the high temperature mixed phase stream injection well 35 via a high pressure cleaned flue gas conduit 20-y via an injection well casing 39.
Specifically, the confluence device 11 is a four-way device, and collects steam from the steam generation device 1, an auxiliary agent from the auxiliary agent device 6, and flue gas from the flue gas distribution device 10, and mixes them to form a high-temperature multi-component mixed-phase flow, and connects one or more injection well oil pipes 38 of the high-temperature mixed-phase flow injection well 35 through the high-temperature mixed-phase flow pipeline 22, and enters the oil layer 37 from the injection well oil pipes 38. Here the high temperature mixed phase flow entering from the oil pipe 35 will be connected in the downhole and flue gas distribution device 10 through the high pressure cleaned flue gas pipe 20-y into the casing of the injection well 35, and the flue gas injected from the casing is mixed to form a new high temperature mixed phase flow which enters the oil layer (37).
Specifically, the auxiliary agent device 6 is connected with the confluence device 11 through an auxiliary agent pipeline 21; the device needs to inject different reservoir auxiliary agents according to the characteristics of the reservoir, and the auxiliary agent is mixed with steam and smoke in the confluence device 11 to form high-temperature multi-component mixed phase flow.
Specifically, the proportions of the components of the high-temperature multi-component mixed phase flow are different according to different flue gas quantities distributed by the flue gas distribution device 10 and different nitrogen reduction quantities of the nitrogen reduction device 2, so that the proportions of the components of the high-temperature multi-component mixed phase flow from the heat value to the components are variable and adjustable, and the fluid has higher heat, more carbon dioxide and smaller volume than the traditional multi-component hot fluid, and therefore has wider oil reservoir adaptability.
By the oil field carbon emission-free high-temperature multi-component miscible phase flooding intelligent system provided by the embodiment, flue gas generated in the oil field thermal recovery process is recovered, and the treated flue gas is mixed with original steam and injected into the oil field together, so that carbon emission of the oil field is avoided; the high-temperature multi-component mixed-phase flow generated after the flue gas, the steam and the auxiliary agent are mixed, and carbon dioxide and nitrogen in the high-temperature multi-component mixed-phase flow are very effective energy-increasing and viscosity-reducing media in oil extraction activities of an oil field, so that the high-temperature multi-component mixed-phase flow has a better oil displacement effect compared with single steam; the proportion of carbon dioxide, nitrogen and steam in the high-temperature multi-component mixed-phase flow, the smoke amount distributed by the smoke distribution device 10 and the nitrogen reduction amount of the nitrogen reduction device 2 can be specifically controlled, so that the high-temperature multi-component mixed-phase flow is variable and adjustable from the heat value to the component proportion, and the fluid has wider oil deposit adaptability than the traditional multi-element hot fluid; the residual oxygen content in the flue gas is controlled within 1 percent through the flue gas analysis and operation control system 12, so that the problem of corrosion to a gas injection pipeline caused by the combination of carbon dioxide, oxygen and water in the traditional multi-element thermal fluid technology is solved; because the flue gas purification device 8 and the ash collecting and processing device 13 are arranged, the invention can be suitable for various fuel boilers, in particular to coal-fired boilers which can generate ash.
Embodiment 2, carbon emission-free self-powered high-temperature multi-component mixed-phase flow flooding intelligent system for oil field
As shown in fig. 2, the self-powered high-temperature multi-component mixed-phase flow-drive intelligent system without carbon emission for an oil field according to an embodiment of the present invention includes an internal combustion engine generator 1', a heat exchanger 44, a flue gas component adjusting device, a flue gas purifying device 8, a nitrogen reducing device 2, a flue gas pressurizing device 9, a flue gas distributing device 10, a converging device 11, and an auxiliary agent device 6.
Specifically, the internal combustion engine generator 1' generates flue gas and forms waste heat while generating electricity using fuel oil (diesel oil, gasoline, heavy oil, crude oil, or biodiesel) or fuel gas (natural gas, biogas, coal gas, or biogas); the internal combustion engine generator 1 has a power cable 50 connected to the outside at the generator power output end. The power generated by the internal combustion engine generator 1' is output to the power distribution device of the present invention through the power cable 50, thereby providing sufficient power for the large power demand equipment of the present invention, such as an air compressor, a water system, a denitrification system, and the like. Generally, the fuel energy in the system of the invention is different according to the internal combustion engine, the electric energy conversion rate is between 28% and 50%, the rest energy exists in the form of heat, and the heat can be injected underground by steam required for heat injection generated by a heat exchange device; in the later stage of the electric energy part, the electric energy part passes through the air compressor, the high-pressure water pump, the oil pump and other electric equipment again to finally enter the stratum in the form of elastic energy or heat energy through the injection flow, so that theoretically, the system does not have large energy loss.
Specifically, the front end flue gas port of the heat exchanger 44 is connected with the exhaust pipe of the internal combustion engine generator 1 'through a flue gas pipeline 15, and the front end water inlet thereof is connected with the cooling heat exchange system of the internal combustion engine generator 1' through a hot water steam pipeline 14-1; the flue gas inlet at the rear end is connected with the flue gas backflow distribution device 7 through a flue gas pipeline 15-1, and the steam outlet at the rear end is connected with the confluence device 11 through a steam pipeline 14.
Specifically, the flue gas component adjusting device comprises a flue gas reflux distribution device 7, the input end of which is connected with the heat exchanger 44 through a normal pressure crude flue gas pipeline 15-1, the output end of which is connected with the air system 3 through a reflux flue gas pipeline 27 and is connected with the flue gas purifying device 8 through a normal pressure crude flue gas pipeline 16. The flue gas backflow distribution device 7 controls the flow direction of flue gas according to the mixed gas proportion requirement of the air system 3, and sends part of the flue gas to the air system 3; the system also comprises a flue gas monitoring device 24 arranged in the normal-pressure crude flue gas pipeline 16, the content of oxygen and carbon monoxide in the flue gas is monitored in real time, and when the content of oxygen in the flue gas exceeds 1%, a starting signal is sent to the controller; the system also comprises a controller 12 which is connected with the smoke monitoring device 24 through a crude smoke analysis signal flow cable 24-1, connected with the smoke backflow distribution device 7 through a backflow smoke control cable 27-1, connected with the fuel system 4 through a fuel control signal cable 25 and connected with the air system 3 through an air control signal cable 26; when the controller 12 receives the starting signal, the controller sends adjusting signals to the smoke backflow distribution device 7, the air system 3 and the fuel system 4 so as to control the residual oxygen content of the smoke at the smoke exhaust end of the internal combustion engine generator 1 to be within 1 percent.
Specifically, the flue gas purification device 8 is connected with a normal pressure crude flue gas pipeline 16 for removing dust, sulfur, temperature and humidity from flue gas in the pipeline, and the flue gas purification device 8 is connected with the water supply system 5 through a flue gas cooling circulating water pipeline 23.
Specifically, the nitrogen reduction device 2 may be a conventional membrane oxygen generator or a pressure swing adsorption oxygen generator, which takes air from an open atmosphere environment, partially or totally separates nitrogen gas to be discharged into the atmosphere again, and the remaining part will be nitrogen reduction air with higher oxygen concentration, and this part of gas enters the air system 3 through the nitrogen reduction air pipe 28, and the air system 3 mixes the nitrogen reduction air with the coarse flue gas from the air supply device 7 according to a required ratio and supplies the mixture to the internal combustion engine generator 1 through the air pipe 29.
Specifically, the flue gas supercharging device 9 is connected with the flue gas purification device 8 through a normal pressure purification flue gas pipeline 17, and pressurizes the purified flue gas to a rated pressure value. The flue gas supercharging device 9 is an air compressor.
Specifically, the input end of the flue gas distribution device 10 is connected with the flue gas supercharging device 9 through a high-pressure purified flue gas pipeline 18, the device is composed of two to a plurality of flow control valves, one of the control valves sends part or all of the flue gas to the confluence device 11 through a high-pressure purified flue gas pipeline 19, the other part of the control valves controls the injection well oil pipe joint 40 which distributes a set amount of flue gas and connects the flue gas to the flue gas injection well 36 through a high-pressure purified flue gas pipeline 20-1, and the flue gas is injected into the well through the injection well oil pipe 38, and after being injected into the ground, the flue gas mainly comprises carbon dioxide and part of nitrogen, the flue gas plays a role in increasing energy and reducing viscosity of the mixed gas of the carbon dioxide and the nitrogen in the underground oil layer 37, and improves the liquid production and oil production capacity of the oil reservoir; the flue gas distribution device 10 also has a part of a control valve for distributing a set amount of said flue gas to be injected downhole via an injection well casing connection 41 connected to the high temperature mixed phase stream injection well 35 via a high pressure cleaned flue gas conduit 20-y via an injection well casing 39.
Specifically, the confluence device 11 is a four-way joint, the front end of which is connected with the heat exchanger 44 through the steam pipeline 11, the confluence device 11 collects the steam from the heat exchanger 44, the auxiliary agent from the auxiliary agent device 6 and the flue gas from the flue gas distribution device 10 to be mixed to form a high-temperature multi-component mixed phase flow, the high-temperature mixed phase flow is connected into the injection well oil pipe 38 of one or more high-temperature mixed phase flow injection wells 35 through the high-temperature mixed phase flow pipeline 22, and the high-temperature multi-component mixed phase flow enters the oil layer 37 from the injection well oil pipe 38. Here the high temperature mixed phase stream entering from injection well 35 will be connected to injection well 35 casing at downhole and flue gas distribution device 10 through high pressure flue gas conduit 20-y, and the flue gas injected from the casing will mix to form a new high temperature mixed phase stream which enters oil formation 37.
Specifically, the auxiliary agent device is connected with the confluence device 11 through an auxiliary agent pipeline 21; the device needs to inject different reservoir auxiliary agents according to the characteristics of the reservoir, and the auxiliary agent is mixed with steam and smoke in the confluence device 11 to form high-temperature multi-component mixed phase flow.
By the oil field carbon emission-free high-temperature multi-component mixed-phase flow-drive intelligent system provided by the embodiment, flue gas generated in the oil field thermal recovery process is recovered, the treated flue gas is mixed with original steam and injected into the oil field, and carbon emission of the oil field is avoided; the high-temperature multi-component mixed-phase flow generated after the flue gas, the steam and the auxiliary agent are mixed, and carbon dioxide and nitrogen in the high-temperature multi-component mixed-phase flow are very effective energy-increasing and viscosity-reducing media in oil extraction activities of an oil field, so that the high-temperature multi-component mixed-phase flow has a better oil displacement effect compared with single steam; the proportion of carbon dioxide, nitrogen and steam in the high-temperature multi-component mixed-phase flow, the smoke amount distributed by the smoke distribution device 10 and the nitrogen reduction amount of the nitrogen reduction device 2 can be specifically controlled, so that the high-temperature multi-component mixed-phase flow is variable and adjustable from the heat value to the component proportion, and the fluid has wider oil deposit adaptability than the traditional multi-element hot fluid; the residual oxygen content in the flue gas is controlled within 1 percent through the flue gas analysis and operation controller 12, so that the problem of corrosion to a gas injection pipeline along the way caused by the combination of carbon dioxide, oxygen and water in the traditional multi-element thermal fluid technology is solved.
Because the heat production part of the system is replaced by the internal combustion engine generator instead of the common steam boiler, the invention can be realized under the condition of not causing obvious impact on the environmental power grid, the realizability of the invention can be greatly improved, and the comprehensive application cost can be reduced.
Preferably, based on the original boiler, a part of steam is used for driving a steam turbine generator set to generate electricity to solve the problem of electricity, and the self-generating function of the mixed-phase flow driving system is also realized.
Preferably, the aforementioned internal combustion engine may be replaced with a combined gas turbine generator, as may the ability of the present multiphase flow drive system to generate heat from both the power generation and heat injection.
Claims (10)
1. An oil field carbon emission-free high-temperature multi-component mixed-phase flow-drive intelligent system comprises:
a steam generating device (1) which generates oil field steam and flue gas;
a flue gas component adjusting device for controlling the content of the flue gas component at the flue gas discharge end of the steam generating device (1);
a flue gas purification device (8) which is sequentially arranged at the rear end of the flue gas component adjusting device and purifies the flue gas;
the nitrogen reducing device (2) is used for adjusting the nitrogen content in the pipeline of the steam generating device (1);
and the flue gas conveying device is used for injecting the purified flue gas into the injection well.
2. An oil field carbon emission-free self-powered high-temperature multi-component mixed-phase flow-flooding intelligent system comprises:
an internal combustion engine generator (1') which generates power while generating flue gas and forms waste heat; the electric power generated by the internal combustion engine generator (1') is output to a power distribution device of the oilfield carbon-emission-free self-powered high-temperature multi-component mixed-phase flow drive intelligent system through a power cable;
a heat exchanger (44) for exchanging heat with the flue gas generated by the internal combustion engine generator (1') to obtain a cooled flue gas and steam;
the flue gas component adjusting device controls the content of the flue gas components discharged from the flue gas outlet of the heat exchanger (44);
a flue gas purification device (8) which is sequentially arranged at the rear end of the flue gas component adjusting device and purifies the flue gas;
the nitrogen reduction device (2) is used for adjusting the nitrogen content in a pipeline of the internal combustion engine generator (1');
and the flue gas conveying device is used for injecting the purified flue gas into the injection well.
3. The intelligent multi-component mixed-phase flow drive system according to claim 2, wherein: the front end smoke port of the heat exchanger (44) is connected with an exhaust pipe of the internal combustion engine generator (1') through a smoke pipeline (15);
the front end water inlet of the heat exchanger (44) is connected with a cooling and heat exchanging system of an internal combustion engine generator (1') through a hot water steam pipeline (14-1);
the rear end smoke outlet of the heat exchanger (44) is connected with a smoke reflux distribution device (7) through a smoke pipeline (15-1);
the rear end steam outlet of the heat exchanger (44) is connected with the confluence device 11 through a steam pipeline 14.
4. The intelligent multi-component mixed-phase flow flooding system of any one of claims 1-3, characterized in that: the smoke component adjusting device comprises a smoke backflow distribution device (7) which is arranged at the discharge end of the steam generating device (1) or the smoke outlet end of the heat exchanger (44) and used for controlling the flow direction of the smoke;
the flue gas monitoring device (24) is arranged at the rear end of the flue gas backflow distribution device (7) and is used for monitoring the component content of the flue gas;
and the controller (12) is linked with the smoke backflow distribution device (7), the smoke monitoring device (24), the air system (3) and the fuel system (4) and sends adjusting signals to the smoke backflow distribution device (7), the air system (3) and the fuel system (4) when the content of the flue gas components exceeds a threshold value.
5. The intelligent multi-component mixed-phase flow flooding system of any one of claims 1-4, characterized in that: the flue gas monitoring device (24) monitors residual oxygen and carbon monoxide in the flue gas and sends a start signal to the controller (12) when the residual oxygen content exceeds 1.2%;
the nitrogen reducing device (2) is arranged at the rear end of the flue gas purification device (8) and is used for separating and purifying nitrogen in the flue gas;
the nitrogen reducing device (2) is arranged at the front end of the air system (3) and used for separating nitrogen from air in the air system (3).
6. The intelligent multi-component miscible flow flooding system of any one of claims 1-5, characterized in that: the flue gas conveying device comprises a confluence device (11) which is respectively connected with a steam outlet of the steam generating device (1) or a steam outlet of the heat exchanger (44) and a flue gas outlet of the flue gas purifying device (8), and the formed high-temperature multi-component mixed-phase flow is injected into an injection well.
7. The multi-component miscible flow flooding intelligent system of any one of claims 1-6, wherein: the intelligent multi-component miscible flow flooding system further comprises an auxiliary device (6) which is communicated with the confluence device (11) to inject reservoir auxiliary agents.
8. The intelligent multi-component mixed-phase flow flooding system of any one of claims 1-8, characterized in that: the multi-component mixed-phase flow drive intelligent system also comprises a flue gas supercharging device (9) which is arranged at the rear end of the flue gas purification device (8) and used for supercharging the purified flue gas to a rated pressure value.
9. The intelligent multi-component mixed-phase flow drive system according to claim 8, wherein: the intelligent multi-component mixed-phase flow flooding system further comprises a smoke distribution device (10) which is sequentially arranged between the smoke pressurization device (9) and the confluence device (11), and an outlet of the smoke distribution device (10) is also connected with an injection well.
10. The intelligent multi-component mixed-phase flow flooding system of any one of claims 1-9, characterized in that: the internal combustion engine generator (1') is a steam turbine generator or a gas turbine generator driven by a steam boiler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111278704.1A CN113803039A (en) | 2021-10-31 | 2021-10-31 | Oil field carbon emission-free high-temperature high-pressure multi-element miscible flooding intelligent system |
| CN2021112787041 | 2021-10-31 |
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| CN202111278704.1A Pending CN113803039A (en) | 2021-10-31 | 2021-10-31 | Oil field carbon emission-free high-temperature high-pressure multi-element miscible flooding intelligent system |
| CN202210906550.4A Pending CN115182711A (en) | 2021-10-31 | 2022-07-29 | Carbon-emission-free self-powered high-temperature multi-component mixed-phase flow-flooding intelligent system for oil field |
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