CN102678097B - Supercritical water oxidation fluid injection production system using nitrogen as protective film and process using same - Google Patents
Supercritical water oxidation fluid injection production system using nitrogen as protective film and process using same Download PDFInfo
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- CN102678097B CN102678097B CN201210163868.4A CN201210163868A CN102678097B CN 102678097 B CN102678097 B CN 102678097B CN 201210163868 A CN201210163868 A CN 201210163868A CN 102678097 B CN102678097 B CN 102678097B
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Abstract
The invention discloses a supercritical water oxidation fluid injection production system using nitrogen as a protective film. The injection-production system comprises an air separation plant, an air film reactor, a shaft and an injection pipeline disposed in the shaft. An oxygen outlet of the air separation plant is communicated with an oxygen inlet at the upper end of the air film reactor through an oxygen booster pump. A nitrogen outlet of the air separation plant is communicated with an upper nitrogen inlet, a lower nitrogen inlet and a gap between the shaft and the injection pipeline through a nitrogen booster pump. The upper nitrogen inlet and the lower nitrogen inlet are reserved on one side of the air film reactor. A fuel inlet and a water inlet which are communicated with a fuel device and a water booster heating device respectively are reserved at the upper end of the air film reactor. An outlet which is communicated with the injection pipeline is reserved at the lower end of the air film reactor. The invention further discloses an injection-production process using the system. Oxygen is used as oxidant and the nitrogen is used as a protective film of the reactor and the shaft, fuel is oxidized through supercritical water, generated multiple thermal fluids are injected into an oil well, and accordingly, viscosity of thickened oil is lowered and oil recovery rate is enhanced.
Description
Technical field
The present invention relates to energy and environment field, especially a kind of supercritical water oxidation fluid injection and extraction system and technique thereof of making diaphragm with nitrogen.
Background technology
Reducing costs, to greatest extent viscous crude, super heavy oil recovery out, is the common issue that oil interface, the world today is faced.Viscous crude is because viscosity is high, gives exploitation, collects defeated and processing and bring very large difficulty.Steam injection oil recovery by heating is the effective means of exploitation heavy crude reservoir.The rule that steam injection is handled up is to reach peak value in the 4th, the 5th cycle oil production, is after this accompanied by the increase in the cycle of handling up, and cycle oil production reduces gradually, and comprehensive water cut increases, production effect worse becoming.After causing the many rounds of heat extraction by steam injection to handle up, the main cause of production effect variation is that steam is in the invalid channelling in the low area of oil saturation.In addition, many oil wells are in drilling well and underground work process, and shaft bottom wax deposition is stopped up serious, cause production capacity to reduce.
Multielement hot fluid (N
2+ CO
2+ water vapour) be comprehensively to improve the mixture of oil recovery factor device generation and the efficient oil displacement system that foaming agent is mixed to form, have the feature of the kinds of processes such as nitrogen, carbon dioxide, oil recovery by heating concurrently, it is directly injected to oil reservoir, thereby increase formation pressure, reduce viscosity of crude, improve displacement of reservoir oil sweep area, reach the object that improves oil recovery factor.On the one hand, adopt multielement hot fluid oil recovery technique can effectively control steamchanneling, improve tar productivity; On the other hand, heat energy dissolves near wellbore zone wax deposition and asphalitine, after injecting, bleeds off pressure, and the non-condensing gas injecting is flowed out at a high speed, carries out near wellbore zone pollutant, reaches effect of increasing production.Facts have proved, this innovative technology can make east China old filed oil recovery factor improve 5% to 20% again.
Current multielement hot fluid is that the oil production equipment by adopting rocket-powered principle produces.This oil production equipment is called as Rocket propulsion system, its operating principle is: the combustion jet mechanism of utilizing rocket engine, motor is fixedly mounted on to ignition in engine space, the mists such as the high-pressure water vapor, carbon dioxide, nitrogen that burning is produced, directly inject oil reservoir by oil well import, increase formation pressure, reduce Crude viscosity, and then improve oil displacement efficiency.But reaction raw materials can reach about 3500K in the reaction temperature of combustion chamber, and this temperature far exceeds the fusing point of nozzle and combustor material, therefore must adopt cooling system to prevent that material is overheated.All cooling provisions are all to form one deck separation layer at locular wall, but combustion instability or cooling system failure usually can cause the protection in boundary layer to be interrupted, and cause subsequently locular wall destroyed.
Supercritical water oxidation method is exceeding under 374 DEG C of the critical-temperatures of water and the high-temperature and high-pressure conditions of critical pressure 22.05MPa, with air or other oxidants, and the method for " burning " oxidation in water by organic matter or reducing inorganic thing.Supercritical water has density, solvability and the good mobility of similar liquids, has again diffusion coefficient and the low-viscosity of similar gas simultaneously.In supercritical water, the boundary of gas-liquid two-phase disappears, and organic matter and oxidant air complete miscibility in supercritical water form homogeneous phase system, and reaction speed is accelerated greatly.In very short reaction time, the more than 99.99% rapid burns oxygen of organic matter changes into carbon dioxide, water, also comprises the nitrogen that has neither part nor lot in reaction in air in product.This product is similar to the component of above-mentioned multielement hot fluid, and temperature, pressure scope is adjustable.In addition, this technology fuel tolerance is wide, and all kinds of organic wastes, oils etc. all can be used as fuel combustion.
But supercritical water oxidation condition harshness, under the condition of HTHP and aerobic, can produce corrosion to reactor wall; In addition supercritical water is a kind of non-polar solven, and the solubility of inorganic salts in supercritical water can sharply decline, thereby forms the precipitation of inorganic salts, the obstruction of induce reaction when serious device or system pipeline.Therefore, Corrosion blockage problem becomes the bottleneck of restriction supercritical Water Oxidation Technology development.Moisture film reactor can solve the corrosion that faces in supercritical Water Oxidation Technology process and the method for mineralization two hang-ups as a kind of simultaneously, cause in recent years the concern of Chinese scholars, obtained certain achievement, but in oil field deionized water be difficult to obtain and high cost problem it is difficult on a large scale for injection production process of fluids produced by supercritical water oxidation.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art; a kind of supercritical water oxidation fluid injection and extraction system and technique thereof of making diaphragm with nitrogen is provided; the present invention adopts using oxygen as oxidant; using nitrogen as reactor with the diaphragm of pit shaft; by supercritical water oxidation fuel; utilize the multielement hot fluid generating to inject oil well, reduce viscosity of thickened oil, and then improve tar productivity.
For achieving the above object, the present invention adopts following technical proposals:
A kind of supercritical water oxidation fluid injection and extraction system of making diaphragm with nitrogen, comprise air separation plant, fuel-device, water supercharging preheating device, oxygen booster pump, nitrogen supercharging pump, air film reactor, pit shaft and flow in pipes, flow in pipes is arranged in pit shaft, the oxygen outlet of described air separation plant communicates with the oxygen intake of air film reactor upper end by oxygen booster pump, the nitrogen outlet of described air separation plant by nitrogen supercharging Beng Fen tri-tunnels respectively with the upper nitrogen inlet of air film reactor side, lower nitrogen inlet, gap between pit shaft and flow in pipes communicates, described air film reactor upper end is also provided with respectively and fuel-device, the fuel inlet that water supercharging preheating device is connected and water inlet, the lower end of air film reactor is provided with the outlet being connected with flow in pipes.
On the pipeline that the nitrogen outlet of described air separation plant is connected with the gap between the upper nitrogen inlet of air film reactor side, lower nitrogen inlet, pit shaft and flow in pipes, be respectively equipped with the first nitrogen flow control valve, the second nitrogen flow control valve and the 3rd nitrogen flow control valve.
In described air film reactor, be provided with the porous wall matching with air film reactor inner chamber, gapped between porous wall and air film reactor wall.
Described fuel-device comprises fuel tank, fuel booster pump, and fuel tank outlet is connected with the fuel inlet of air film reactor upper end by fuel booster pump.
Described water supercharging preheating device comprises that water tank is connected with the water inlet of air film reactor upper end by water booster pump, water preheater.
Between the upper end of described pit shaft and flow in pipes, be provided with the oil well nitrogen inlet communicating with gap, a wherein road of the nitrogen outlet of air separation plant communicates with oil well nitrogen inlet through nitrogen supercharging pump, the 3rd nitrogen flow control valve.
Described flow in pipes the first half is passed and is welded on adpting flange, and adpting flange is connected with pit shaft upper port.
The lower end of described air film reactor exports the pipeline being connected with flow in pipes and is provided with multielement hot fluid pressure-regulating valve.
An injection production process of fluids produced by supercritical water oxidation of making diaphragm with nitrogen, step is as follows:
(1) air is separated into nitrogen and oxygen by air separation plant, wherein oxygen boosts to 22.1-30MPa through oxygen booster pump, fuel boosts to 22.1-30MPa through fuel booster pump, water is preheated to 300-600 DEG C after water booster pump boosts to 22.1-30MPa, and three all injects from air film reactor head;
(2) oxygen, fuel, the water that inject from air film reactor head carry out supercritical water oxidation on reactor top, and product is carbon dioxide, remaining oxygen, water;
(3) by the isolated a part of nitrogen of air separation plant, after boosting to 22.1-30MPa, injects by porous wall from air film reactor side by nitrogen supercharging pump, as the gas shield film of air film reactor, by wall of reactor and supercritical water oxidation region disconnecting;
(4) supercritical water oxidation product flows out from the outlet of air film reactor lower part at the mixed mixture of air film reactor lower part with the nitrogen of the gas shield film as reactor, after the pressure regulation of multielement hot fluid pressure-regulating valve, inject oil well by the flow in pipes being welded on adpting flange;
(5) by the isolated another part nitrogen of air separation plant, extremely consistent with the mixture pressure after the pressure regulation of multielement hot fluid pressure-regulating valve by the 3rd nitrogen pressure control valve pressure regulation, in the gap between flow in pipes and pit shaft, as the diaphragm of pit shaft.
Fuel in described step (1) and step (2) be the crude oil taked on the spot or high concentration oil extraction waste water or other can be in supercritical water oxidation environment the fuel of exothermic heat of reaction, without preheating in advance.
The water that in described step (1), reactor head is injected is light water, and after supercharging and preheating, temperature is 300-600 DEG C, and pressure is 22.1-30MPa, for supercritical water oxidation provides primary power.
In described step (4), the mixture fluid of air film reactor outlet is after the pressure regulation of multielement hot fluid pressure-regulating valve, and its pressure is 5-30MPa, temperature 150-350 DEG C.
Oxidant of the present invention is the oxygen producing by air separation plant, fuel be the crude oil taked on the spot or high concentration oil extraction waste water or other can be in supercritical water oxidation environment the fuel of exothermic heat of reaction.The water that reactor head is injected is light water, and after supercharging and preheating, temperature is 300-600 DEG C, and pressure is 22.1-30MPa, for supercritical water oxidation provides primary power.For avoiding fuel in problems such as warm-up phase cokings, fuel does not carry out preheating entering before reactor, relies on above-mentioned said water extraction supplying heat source completely.
Water the oxygen, fuel, preheating injecting from air film reactor head carries out supercritical water oxidation on reactor top, and product is carbon dioxide, remaining oxygen, water, emits amount of heat simultaneously.
By above-mentioned technique, can realize supercritical water oxidation fluid for oil field injection and extraction, can solve corrosion and the mineralization problem of course of reaction simultaneously.By air film, reactor is protected, realized the stable operation of equipment long-term safety.Adopt the nitrogen of air separation plant generation as air film, by porous wall injecting reactor, between the supercritical water oxidation product of the nitrogen of low temperature and high temperature, can form a boundary layer, the reaction zone of supercritical water oxidation and reactor wall are kept apart; On the other hand, reactor wall has continuous Bubble formation always, makes inorganic salts cannot be bonded to wall, has also avoided scale problems.Too much can affect normally carrying out of supercritical water oxidation for avoiding reactor top to be filled with nitrogen, nitrogen is divided into two sections from reactor side and injects by porous wall, and the ratio of adjustable two sections meets service requirement.After the product of final supercritical water oxidation mixes completely with nitrogen, flow out from reactor lower part together.Multielement hot fluid to the fluid parameter that is applicable to oil field injection and extraction, enters oil well through flow in pipes through pressure-regulating valve pressure regulation, and this pipeline can be for convenience detach., between flow in pipes and pit shaft, fill with nitrogen, as protection gas, the pressure of nitrogen is consistent with the fluid pressure in pipeline, has reduced the material requirement to flow in pipes, has avoided the corrosion to pit shaft meanwhile, and meanwhile, flow in pipes is also conveniently replaced after damaging.
The present invention is by supercritical water oxidation fuel, and the multielement hot fluid of generation is injected in oil well, reduces viscosity of thickened oil, improves tar productivity, has boundless application prospect.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention.
In figure: 1-air separation plant, 2-oxygen booster pump, 3-oxygen intake, 4-fuel tank, 5-fuel booster pump, 6-fuel inlet, 7-water tank, 8-water booster pump, 9-water preheater, 10-water inlet, 11-air film reactor, 12-porous wall, 13-nitrogen supercharging pump, 14-the first nitrogen flow control valve, the upper nitrogen inlet of 15-, 16-the second nitrogen flow control valve, nitrogen inlet under 17-, 18-the 3rd nitrogen pressure control valve, 19-oil well nitrogen inlet, 20-multielement hot fluid pressure-regulating valve, 21-adpting flange, 22-pit shaft, 23-flow in pipes.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
embodiment 1:
As shown in Figure 1, the crude oil in fuel tank 4 boosts to 23MPa through fuel booster pump 5, from fuel inlet 6 injected gas membrane reactors 11; The oxygen producing through air separation plant 1 boosts to 23MPa through oxygen booster pump 2, from oxygen intake 3 injected gas membrane reactors 11; Water in water tank 7 boosts to 23MPa through water booster pump 8, is preheated to 300-600 DEG C through water preheater 9, by water inlet 10 from top injected gas membrane reactor.After three mixes by nozzle, there is supercritical water oxidation on air film reactor 11 tops, generate carbon dioxide and water.A part of nitrogen that air separation plant 1 produces is divided into upper and lower two-way after nitrogen supercharging pump 13 is pressurized to 23MPa; after first, second nitrogen flow control valve 14,16 adjust fluxes; through the upper and lower nitrogen inlet 15,17 of air film reactor; enter air film reactor 11 by porous wall 12; on wall, produce one deck air film; avoid corrosion with guard reactor, avoid the fouling of inorganic salts on reactor wall simultaneously.
Supercritical water oxidation product carbon dioxide, water, remaining oxygen and the nitrogen as diaphragm flow out from air film reactor lower part together, to 5-30MPa, inject oil well by flow in pipes 23 by 20 pressure regulation of multielement hot fluid pressure-regulating valve.Another part nitrogen that air separation plant 1 produces is pressurized to after 23MPa through nitrogen supercharging pump 13; extremely consistent with the product pressure after 20 pressure regulation of multielement hot fluid pressure-regulating valve by the 3rd nitrogen pressure control valve 18 pressure regulation; in gap between oil well nitrogen inlet 19 flow in pipes 23 and pit shaft 22 on adpting flange 21, as the diaphragm of pit shaft 22.
embodiment 2
The present embodiment difference from Example 1, is that crude oil is replaced to high concentration oil extraction waste water, in producing multielement hot fluid, can also realize the harmless treatment of oil extraction waste water, has good environmental effect, and all the other flow processs are identical with embodiment 1.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. make the supercritical water oxidation fluid injection and extraction system of diaphragm with nitrogen for one kind, it is characterized in that, comprise air separation plant, fuel-device, water supercharging preheating device, oxygen booster pump, nitrogen supercharging pump, air film reactor, pit shaft and flow in pipes, flow in pipes is arranged in pit shaft, the oxygen outlet of described air separation plant communicates with the oxygen intake of air film reactor upper end by oxygen booster pump, the nitrogen outlet of described air separation plant by nitrogen supercharging Beng Fen tri-tunnels respectively with the upper nitrogen inlet of air film reactor side, lower nitrogen inlet, gap between pit shaft and flow in pipes communicates, described air film reactor upper end is also provided with respectively and fuel-device, the fuel inlet that water supercharging preheating device is connected and water inlet, the lower end of air film reactor is provided with the outlet being connected with flow in pipes,
On the pipeline that the nitrogen outlet of described air separation plant is connected with the gap between the upper nitrogen inlet of air film reactor side, lower nitrogen inlet, pit shaft and flow in pipes, be respectively equipped with the first nitrogen flow control valve, the second nitrogen flow control valve and the 3rd nitrogen flow control valve;
In described air film reactor, be provided with the porous wall matching with air film reactor inner chamber, gapped between porous wall and air film reactor wall; The lower end of described air film reactor exports the pipeline being connected with flow in pipes and is provided with multielement hot fluid pressure-regulating valve;
The nitrogen that air separation plant produces is as air film, nitrogen is divided into two sections by porous wall injecting reactor from air film reactor side, between the supercritical water oxidation product of the nitrogen of low temperature and high temperature, can form a boundary layer, the reaction zone of supercritical water oxidation and air film reactor wall are kept apart; Air film reactor wall has continuous Bubble formation always, makes inorganic salts cannot be bonded to wall, has avoided fouling generation.
2. the system as claimed in claim 1, is characterized in that, described fuel-device comprises fuel tank, fuel booster pump, and fuel tank outlet is connected with the fuel inlet of air film reactor upper end by fuel booster pump.
3. the system as claimed in claim 1, is characterized in that, described water supercharging preheating device comprises that water tank is connected with the water inlet of air film reactor upper end by water booster pump, water preheater.
4. the system as claimed in claim 1, it is characterized in that, between the upper end of described pit shaft and flow in pipes, be provided with the oil well nitrogen inlet communicating with gap, a wherein road of the nitrogen outlet of air separation plant communicates with oil well nitrogen inlet through nitrogen supercharging pump, the 3rd nitrogen flow control valve; Described flow in pipes the first half is passed and is welded on adpting flange, and adpting flange is connected with pit shaft upper port.
5. utilize in claim 1-4 an injection-production technology for system described in any one, it is characterized in that, step is as follows:
(1) air is separated into nitrogen and oxygen by air separation plant, wherein oxygen boosts to 22.1-30MPa through oxygen booster pump, fuel boosts to 22.1-30MPa through fuel booster pump, water is preheated to 300-600 DEG C after water booster pump boosts to 22.1-30MPa, and three all injects from air film reactor head;
(2) oxygen, fuel, the water that inject from air film reactor head carry out supercritical water oxidation on reactor top, and product is carbon dioxide, remaining oxygen, water;
(3) by the isolated a part of nitrogen of air separation plant, after boosting to 22.1-30MPa, injects by porous wall from air film reactor side by nitrogen supercharging pump, as the gas shield film of air film reactor, by wall of reactor and supercritical water oxidation region disconnecting;
(4) supercritical water oxidation product flows out from the outlet of air film reactor lower part at the mixed mixture of air film reactor lower part with the nitrogen of the gas shield film as reactor, after the pressure regulation of multielement hot fluid pressure-regulating valve, inject oil well by the flow in pipes being welded on adpting flange;
(5) by the isolated another part nitrogen of air separation plant, extremely consistent with the mixture pressure after the pressure regulation of multielement hot fluid pressure-regulating valve by the 3rd nitrogen pressure control valve pressure regulation, in the gap between flow in pipes and pit shaft, as the diaphragm of pit shaft.
6. technique as claimed in claim 5, is characterized in that, the fuel in described step (1) and step (2) is crude oil or the high concentration oil extraction waste water of taking on the spot, without preheating in advance.
7. technique as claimed in claim 5, is characterized in that, the water that in described step (1), reactor head is injected is light water, and after supercharging and preheating, temperature is 300-600 DEG C, and pressure is 22.1-30MPa, for supercritical water oxidation provides primary power.
8. technique as claimed in claim 5, is characterized in that, in described step (4), the mixture fluid of air film reactor outlet is after the pressure regulation of multielement hot fluid pressure-regulating valve, and its pressure is 5-30MPa, temperature 150-350 DEG C.
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| CN104671388B (en) * | 2015-01-28 | 2016-08-24 | 广州中国科学院先进技术研究所 | A kind of supercritical water oxidation system using air as diaphragm and reaction process |
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| CN114735801A (en) * | 2022-03-16 | 2022-07-12 | 石家庄新奥环保科技有限公司 | Supercritical water oxidation reactor |
| CN114772776B (en) * | 2022-03-31 | 2024-01-09 | 深圳市华尔信环保科技有限公司 | Rotational flow suspension type supercritical water oxidation reactor |
| CN114772698B (en) * | 2022-03-31 | 2024-01-05 | 深圳市华尔信环保科技有限公司 | Supercritical water oxidation system for organic waste liquid |
| CN115318235B (en) * | 2022-08-31 | 2024-01-05 | 西安交通大学 | Continuous system and method for collecting water-soluble inorganic salt deposition particles in high-temperature high-pressure water |
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