A high-pressure gas-steam flow multi-stage generating system

Abstract

The application provides a high-pressure gas-steam fluid multistage generating system, and belongs to the technical field of heavy oil exploitation. The system comprises at least one generating unit connected in series; each generating unit comprises a high-pressure combustion device and a cooling device connected in series; the high-pressure combustion device comprises a combustion-supporting gas inlet, a fuel inlet and a flue gas outlet; the high-pressure combustion device is used for burning fuel and combustion-supporting gas to generate flue gas; and the cooling device is used for cooling the flue gas and comprises a partition wall heat exchange device and a fluid contact device. The system can improve the safety, reliability and economy of the high-pressure gas-steam fluid generating process, realize fuel energy cascade utilization and direct reuse of oily sewage, and further reduce the environmental cost and economic cost of heavy oil exploitation, and has great significance in heavy oil exploitation.

Description

Technical Field

[0001] This invention relates to the field of heavy oil extraction technology, and in particular to a high-pressure gas-vapor fluid multi-stage generation system. Background Technology

[0002] The Earth possesses extremely abundant heavy oil resources, with geological reserves far exceeding those of conventional crude oil, making heavy oil a crucial source of petroleum. my country ranks among the world's largest holders of heavy oil reserves, thus its extraction is of great significance. Heavy oil extraction in my country has been developing for over thirty years, achieving a series of major technological breakthroughs and playing a vital role in stabilizing and increasing my country's oil production. However, shortcomings still exist. For example, there are problems such as long blowout cycles, low efficiency, low recovery rates, high energy utilization (e.g., using natural gas combustion to generate steam and heat gathering and transportation return water), high water consumption, large amounts of oily wastewater, and high water treatment costs.

[0003] Increased temperature can significantly reduce crude oil viscosity; therefore, heavy oil is generally recovered thermally, with heating and gathering employed when necessary. Thermal recovery of heavy oil is a crucial component of stable oilfield production. Traditional heavy oil extraction technologies include steam injection, steam flooding, steam-assisted gravity drainage (SAGD), and fire flooding. In recent years, high-pressure gas-vapor fluids have attracted widespread attention as alternative oil displacement media because they can increase heavy oil production through thermal viscosity reduction, gas dissolution, and formation pressure replenishment, thereby improving heavy oil extraction efficiency. Therefore, high-pressure gas-vapor fluid flooding is an important development direction for heavy oil thermal recovery.

[0004] The generation of high-pressure gas-vapor fluid is a high-temperature and high-pressure process. Taking the combustion of natural gas or oilfield gas and air under high pressure to generate high-pressure gas-vapor fluid as an example, the theoretical combustion temperature can reach up to about 2000℃, while the injection pressure is generally required to be around 21MPa. Therefore, high-pressure combustion devices used to generate high-pressure gas-vapor fluid face the challenge of simultaneously withstanding high temperature and high pressure. For conventional gas-vapor generation technology using a single-stage combustion device, this problem must be solved in two ways. One is to reduce the combustion temperature by increasing the excess air coefficient, but the side effect is that the high-pressure air compression work required to provide a unit of injection heat will increase significantly. The other is to use super refractory materials and increase the thickness of the insulation layer, but the side effect is that the diameter of the high-pressure combustion device and the thickness of the pressure-resistant outer shell required to provide a unit of injection heat will increase significantly, and it may be necessary to use embedded water-cooling pipes for cooling, resulting in high manufacturing costs and lower reliability and safety. Summary of the Invention

[0005] To address the challenges of simultaneously withstanding high temperature and pressure in high-pressure combustion devices and avoid the problems inherent in conventional technologies, this invention provides a multi-stage high-pressure gas-vapor fluid generation system. This system involves feeding fuel into multiple high-pressure combustion devices connected in series for combustion in stages. Each stage generates a significant excess air coefficient, and the combustion flue gas in each stage is cooled before being introduced into the next stage, ultimately reducing the combustion temperature. Furthermore, the excess air coefficient does not increase for the entire multi-stage system, thus the high-pressure air compression work required to provide a unit of injection heat remains unchanged. Therefore, the multi-stage generation technology reduces the generation temperature without producing side effects, perfectly solving the aforementioned problems.

[0006] This invention provides a high-pressure gas-vapor fluid multi-stage generation system, which uses a high-pressure combustion device to burn fuel gas and oxidizing gas to generate high-pressure gas-vapor fluid. The system is constructed by multiple generation units, and a cooling device is installed in each generation unit to cool the flue gas, thereby effectively reducing the temperature of the gas-vapor generation process. In this way, the thickness of the refractory and insulation materials of the high-pressure combustion device, as well as the diameter and thickness of the pressure-resistant shell, are significantly reduced. At the same time, the use of embedded water-cooling pipes is avoided, making the structure of the high-pressure combustion device simple, compact, and reliable.

[0007] In addition, to address the aforementioned issues of high energy utilization at low efficiency and related problems with oily wastewater from oilfields, the system provided by this invention also includes using a partition wall heat exchange device to couple an external power generation cycle to achieve combined heat and power (CHP) of combustion heat energy, thereby realizing cascade utilization; using a fluid contact device to directly spray oily wastewater from oilfields into wells, thereby realizing the reuse of oily wastewater; and using a fluid contact device to heat the gathering and transportation return water, etc.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0009] A high-pressure gas-vapor fluid multi-stage generation system includes N stages of generation units connected in series;

[0010] The generating unit includes a high-pressure combustion device and a cooling device connected in series.

[0011] The high-pressure combustion device includes a combustion-supporting gas inlet, a fuel inlet, and a flue gas outlet A; the flue gas outlet A is connected to the flue gas inlet of the cooling device via a pipeline; the pressure in the high-pressure combustion device is 3-25 MPa.

[0012] The cooling device is a partition wall heat exchange device or a fluid contact device;

[0013] The indirect heat exchange device includes a flue gas inlet, a flue gas outlet B, a cooling fluid inlet A, and a cooling fluid outlet; the cooling fluid and the flue gas undergo indirect heat exchange.

[0014] The fluid contact device includes a flue gas inlet, a flue gas outlet C, a cooling fluid inlet B, and a nozzle; the flue gas inlet is located at the bottom of the fluid contact device, the flue gas outlet C is located at the top of the fluid contact device, the nozzle is placed in the upper part of the fluid contact device, and the nozzle is connected to the cooling fluid inlet B through a pipe.

[0015] The N is not less than 1; the internal pressure of the generating unit is not higher than 25 MPa.

[0016] When N≥2, the flue gas outlet B or flue gas outlet C of the previous generating unit is connected to the combustion gas inlet of the high-pressure combustion device of the next generating unit.

[0017] The high-pressure combustion device is a cylindrical pressure-bearing structure, which includes, from the inside out, a combustion chamber, refractory material, heat insulation material and a pressure-resistant outer shell. The fuel and combustion-supporting gas are burned in the combustion chamber.

[0018] The fluid contact device also includes packing material and a circulating spray pipeline. The packing material is placed inside the fluid contact device, and the circulating spray pipeline is placed at the bottom of the fluid contact device, including a connecting pipe from the bottom to the top of the fluid contact device and a circulating pump.

[0019] Cooling fluid and flue gas exchange heat within the packing.

[0020] The fluid contact device collects liquid at its bottom, which flows out through the cooling fluid outlet at the bottom of the device and is then sent to the nozzle via a circulation pump and pipeline. (Under normal circumstances, the liquid sprayed from the nozzle will completely vaporize and be discharged with the flue gas. The circulation pump is provided here to ensure that any small amount of liquid that may remain at the bottom of the device participates in the circulation.)

[0021] The cooling fluid outlet at the bottom of the fluid contact device is connected to a pipeline and serves as the outlet for crude oil gathering and transportation water.

[0022] When the liquid at the cooling fluid outlet is used as a collection and transportation water for crude oil collection and transportation, the flue gas outlet C of the Nth generation unit is connected to the venting pipeline.

[0023] The cooling fluid outlet of the partition heat exchanger is connected back to the cooling fluid inlet A via a pipeline. An expander, a condenser, and a booster pump are sequentially installed on the pipeline connecting the cooling fluid outlet to the cooling fluid inlet A.

[0024] The cooling fluid introduced into the cooling fluid inlet B of the fluid contact device includes oily wastewater generated by water drive, steam drive, steam huff and puff, or SAGD oil recovery processes in oil fields, or crude oil gathering and transportation return water.

[0025] The Nth generation unit is connected to the oil well via a pipeline, and the gaseous fluid discharged from the flue gas outlet B or flue gas outlet C of the Nth generation unit is injected into the oil well.

[0026] The system consists of two condensers connected in series, operating alternately and taking turns performing external descaling on the condenser tubes. The condensers can also be designed in parallel.

[0027] The above technical solution has at least the following advantages compared with the existing technology:

[0028] The above-mentioned scheme can improve the safety, reliability and economy of the high-pressure gas-vapor fluid generation process, realize the cascade utilization of fuel energy and the direct reuse of oily wastewater, thereby reducing the environmental and economic costs of heavy oil extraction, which is of great significance in heavy oil extraction. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a system flowchart of Embodiment 1 of the present invention;

[0031] Figure 2 This is a system flowchart of Embodiment 2 of the present invention;

[0032] Figure 3 This is a system flowchart of Embodiment 3 of the present invention;

[0033] Figure 4 This is a system flowchart of Embodiment 4 of the present invention.

[0034] Wherein: 1-generating unit one, 2-generating unit two, 11-high pressure combustion device one, 12-fluid contact device one, 13-interval heat exchange device one, 21-high pressure combustion device two, 22-fluid contact device two, 23-interval heat exchange device two, 101-expander, 102-condenser one, 103-condenser two, 104-boost pump. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. Terms such as “connection” or “linked” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. It should be noted that the terms “upper,” “lower,” “left,” “right,” “front,” and “back” used in this invention are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] This invention provides a high-pressure gas-vapor fluid multi-stage generation system.

[0038] The system includes N-stage cascaded generator units;

[0039] The generating unit includes a high-pressure combustion device and a cooling device connected in series.

[0040] The high-pressure combustion device includes a combustion-supporting gas inlet, a fuel inlet, and a flue gas outlet A; the flue gas outlet A is connected to the flue gas inlet of the cooling device via a pipeline.

[0041] The cooling device is a partition wall heat exchange device or a fluid contact device;

[0042] The indirect heat exchange device includes a flue gas inlet, a flue gas outlet B, a cooling fluid inlet A, and a cooling fluid outlet; the cooling fluid and the flue gas undergo indirect heat exchange.

[0043] The fluid contact device includes a flue gas inlet, a flue gas outlet C, a cooling fluid inlet B, and a nozzle; the flue gas inlet is located at the bottom of the fluid contact device, the flue gas outlet C is located at the top of the fluid contact device, the nozzle is placed in the upper part of the fluid contact device, and the nozzle is connected to the cooling fluid inlet B through a pipe.

[0044] The following description, in conjunction with specific embodiments, illustrates this point.

[0045] Example 1

[0046] like Figure 1 As shown, the system includes two-stage cascaded generating units, namely generating unit 1 and generating unit 2.

[0047] Generating unit 1 includes a high-pressure combustion device 11 and a fluid contact device 12 connected in series, and generating unit 2 includes a high-pressure combustion device 21 and a fluid contact device 22 connected in series.

[0048] Furthermore, the aforementioned high-pressure combustion devices are all cylindrical pressure-bearing structures, which, from the inside out, include a combustion chamber, refractory material, insulation material, and a pressure-resistant outer shell. The combustion chamber is used for fuel and air combustion.

[0049] Furthermore, the fluid contact device is also equipped with packing material and a circulating spray pipeline. The packing material is used to provide a heat exchange site for oily wastewater and flue gas. The circulating spray pipeline collects liquid at the bottom of the fluid contact device and sends the liquid into the spray head through a circulating pump.

[0050] In practical applications, the system operates as follows:

[0051] (a) Air is introduced into the combustion-supporting inlet of the high-pressure combustion device 11, and fuel is introduced into the fuel inlet of the high-pressure combustion device 11. The fuel and air are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 11.

[0052] (b) Flue gas from high-pressure combustion device 11 is introduced into the flue gas inlet of fluid contact device 12, and oilfield wastewater is introduced into the cooling fluid inlet B of fluid contact device 12. In fluid contact device 12, oilfield wastewater is sprayed evenly through nozzles, directly contacts the flue gas for heat exchange and vaporization, and then discharged together from the flue gas outlet C of fluid contact device 12.

[0053] (c) The fluid discharged from the flue gas outlet C of the fluid contact device 12 is introduced into the combustion-supporting inlet of the high-pressure combustion device 21, and the fuel is introduced into the fuel inlet of the high-pressure combustion device 21. The fuel and the fluid are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 21.

[0054] (d) The flue gas from the high-pressure combustion device 21 is introduced into the flue gas inlet of the fluid contact device 22, and the oilfield sewage is introduced into the cooling fluid inlet B of the fluid contact device 22. In the fluid contact device 22, the oilfield sewage is sprayed evenly through the nozzle, and directly contacts the flue gas for heat exchange and vaporization and mixing, thereby generating a gas-vapor fluid, which is discharged from the flue gas outlet C of the fluid contact device 22.

[0055] In the aforementioned high-pressure combustion devices, the excess air coefficient is relatively large, generally greater than 1.5. The fuel is typically natural gas or associated gas from oil fields.

[0056] Furthermore, the aforementioned oily wastewater mainly originates from oilfield processes such as water flooding, steam flooding, steam huff and puff, and SAGD (Self-Aided Aquaculture Degradation).

[0057] Furthermore, the flue gas outlet C of the fluid contact device 22 is connected to the oil well through a pipeline, and the gas and steam fluid discharged from the fluid contact device 22 is injected into the oil well, mainly for thermal driving of the crude oil downhole.

[0058] Furthermore, in order to effectively drive oil, the pressure of the gas-vapor fluid generated by the system generating unit is generally between 5-20 MPa, and the maximum is generally no more than 21 MPa.

[0059] Example 2

[0060] like Figure 2 As shown, the system includes two-stage cascaded generating units, namely generating unit 1 and generating unit 2.

[0061] Generating unit 1 includes a high-pressure combustion device 11 and a partition wall heat exchange device 13 connected in series. Generating unit 2 includes a high-pressure combustion device 21 and a partition wall heat exchange device 23 connected in series.

[0062] Furthermore, the aforementioned high-pressure combustion devices are all cylindrical pressure-bearing structures, which, from the inside out, include a combustion chamber, refractory material, insulation material, and a pressure-resistant outer shell. The combustion chamber is used for fuel and air combustion.

[0063] Furthermore, the cooling fluid outlet of the aforementioned partition heat exchange device, the expander 101, the first condenser 102, the second condenser 103, the booster pump 104, and the cooling fluid inlet A of the aforementioned partition heat exchange device are connected in sequence through pipelines. The expander 101 is used to perform external work and drive the generator to generate electricity.

[0064] In practical applications, the system operates as follows:

[0065] (a) Air is introduced into the combustion-supporting inlet of the high-pressure combustion device 11, and fuel is introduced into the fuel inlet of the high-pressure combustion device 11. The fuel and air are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 11.

[0066] (b) Flue gas from high-pressure combustion device 11 is introduced into the flue gas inlet of partition heat exchange device 13 and discharged from the flue gas outlet B of partition heat exchange device 13. Cooling fluid is introduced from the cooling fluid inlet A of partition heat exchange device 13 and discharged from the cooling fluid outlet of partition heat exchange device 13. The cooling fluid and flue gas undergo partition heat exchange.

[0067] (c) The fluid discharged from the flue gas outlet B of the partition heat exchanger 13 is introduced into the combustion gas inlet of the high-pressure combustion device 21, and the fuel is introduced into the fuel inlet of the high-pressure combustion device 21. The fuel and the fluid are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 21.

[0068] (d) The flue gas from the high-pressure combustion device 21 is introduced into the flue gas inlet of the partition heat exchange device 23 and discharged from the flue gas outlet B of the partition heat exchange device 23 as a gas-vapor fluid. The cooling fluid is introduced from the cooling fluid inlet A of the partition heat exchange device 23 and discharged from the cooling fluid outlet of the partition heat exchange device 23. The cooling fluid and the flue gas undergo partition heat exchange.

[0069] In the aforementioned high-pressure combustion devices, the excess air coefficient is relatively large, generally greater than 1.5. The fuel is typically natural gas or associated gas from oil fields. The cooling fluid introduced into the aforementioned partitioned heat exchanger is generally water.

[0070] Furthermore, condenser 102 and condenser 2 103 are used alternately to heat crude oil collection and return water or for other heating purposes, and are used alternately for descaling.

[0071] Furthermore, the flue gas outlet B of the partition wall heat exchanger 23 is connected to the oil well through a pipeline, and the gas-vapor fluid discharged from the partition wall heat exchanger 23 is injected into the oil well, mainly for gas drive of the crude oil downhole.

[0072] Furthermore, in order to effectively drive away oil, the gas-vapor fluid pressure generated in the system is generally between 5-20 MPa, and the maximum is generally no more than 21 MPa.

[0073] Example 3

[0074] like Figure 3 As shown, the system includes two-stage cascaded generating units, namely generating unit 1 and generating unit 2.

[0075] Generating unit 1 includes a high-pressure combustion device 11 and a partition heat exchange device 13 connected in series. Generating unit 2 includes a high-pressure combustion device 21 and a fluid contact device 22 connected in series.

[0076] Furthermore, the aforementioned high-pressure combustion devices are all cylindrical pressure-bearing structures, which, from the inside out, include a combustion chamber, refractory material, insulation material, and a pressure-resistant outer shell. The combustion chamber is used for fuel and air combustion.

[0077] Furthermore, the fluid contact device is also equipped with packing material and a circulating spray pipeline. The packing material is used to provide a heat exchange site for oily wastewater and flue gas. The circulating spray pipeline collects liquid at the bottom of the fluid contact device and sends the liquid into the spray head through a circulating pump.

[0078] Furthermore, the cooling fluid outlet of the aforementioned partition heat exchange device, the expander 101, the first condenser 102, the second condenser 103, the booster pump 104, and the cooling fluid inlet A of the aforementioned partition heat exchange device are connected in sequence through pipelines. The expander 101 is used to perform external work and drive the generator to generate electricity.

[0079] In practical applications, the system operates as follows:

[0080] (a) Air is introduced into the combustion-supporting inlet of the high-pressure combustion device 11, and fuel is introduced into the fuel inlet of the high-pressure combustion device 11. The fuel and air are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 11.

[0081] (b) Flue gas from high-pressure combustion device 11 is introduced into the flue gas inlet of partition heat exchange device 13 and discharged from the flue gas outlet B of partition heat exchange device 13. Cooling fluid is introduced from the cooling fluid inlet A of partition heat exchange device 13 and discharged from the cooling fluid outlet of partition heat exchange device 13. The cooling fluid and flue gas undergo partition heat exchange.

[0082] (c) The fluid discharged from the flue gas outlet B of the partition heat exchanger 13 is introduced into the combustion gas inlet of the high-pressure combustion device 21, and the fuel is introduced into the fuel inlet of the high-pressure combustion device 21. The fuel and the fluid are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 21.

[0083] (d) The flue gas from the high-pressure combustion device 21 is introduced into the flue gas inlet of the fluid contact device 22, and the oilfield sewage is introduced into the cooling fluid inlet B of the fluid contact device 22. In the fluid contact device 22, the oilfield sewage is sprayed evenly through the nozzle, and directly contacts the flue gas for heat exchange and mixing, thereby generating a gas-vapor fluid, which is discharged from the flue gas outlet of the fluid contact device 22.

[0084] In the aforementioned high-pressure combustion devices, the excess air coefficient is relatively large, generally greater than 1.5. The fuel is typically natural gas or associated gas from oil fields. The cooling fluid introduced into the aforementioned partitioned heat exchanger is generally water.

[0085] Furthermore, the aforementioned oily wastewater mainly originates from oilfield processes such as water flooding, steam flooding, steam huff and puff, and SAGD (Self-Aided Aquaculture Degradation).

[0086] Furthermore, condenser 102 and condenser 2 103 are used alternately to heat crude oil collection and return water or for other heating purposes, and are used alternately for descaling.

[0087] Furthermore, the flue gas outlet of the fluid contact device 22 is connected to the oil well through a pipeline, and the gaseous fluid discharged from the fluid contact device 22 is injected into the oil well, mainly for thermal or gas-driven crude oil in the well.

[0088] Furthermore, in order to effectively drive away oil, the gas-vapor fluid pressure generated in the system is generally between 5-20 MPa, and the maximum is generally no more than 21 MPa.

[0089] Example 4

[0090] like Figure 4 As shown, the system includes two-stage cascaded generating units, namely generating unit 1 and generating unit 2.

[0091] Generating unit 1 includes a high-pressure combustion device 11 and a partition heat exchange device 13 connected in series. Generating unit 2 includes a high-pressure combustion device 21 and a fluid contact device 22 connected in series.

[0092] Furthermore, the aforementioned high-pressure combustion devices are all cylindrical pressure-bearing structures, which, from the inside out, include a combustion chamber, refractory material, insulation material, and a pressure-resistant outer shell. The combustion chamber is used for fuel and air combustion.

[0093] Furthermore, the aforementioned fluid contact device also includes a cooling fluid outlet, from which liquid is used as a collection and transportation water for crude oil collection and transportation.

[0094] Furthermore, the cooling fluid outlet of the aforementioned partition heat exchange device, the expander 101, the first condenser 102, the second condenser 103, the booster pump 104, and the cooling fluid inlet of the aforementioned partition heat exchange device are connected in sequence through pipelines. The expander 101 is used to perform external work and drive the generator to generate electricity.

[0095] In practical applications, the system operates as follows:

[0096] (a) Air is introduced into the combustion-supporting inlet of the high-pressure combustion device 11, and fuel is introduced into the fuel inlet of the high-pressure combustion device 11. The fuel and air are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 11.

[0097] (b) Flue gas from high-pressure combustion device 11 is introduced into the flue gas inlet of partition heat exchange device 13 and discharged from the flue gas outlet B of partition heat exchange device 13. Cooling fluid is introduced from the cooling fluid inlet A of partition heat exchange device 13 and discharged from the cooling fluid outlet of partition heat exchange device 13. The cooling fluid and flue gas undergo partition heat exchange.

[0098] (c) The fluid discharged from the flue gas outlet B of the partition heat exchanger 13 is introduced into the combustion gas inlet of the high-pressure combustion device 21, and the fuel is introduced into the fuel inlet of the high-pressure combustion device 21. The fuel and the fluid are burned, and the generated flue gas is discharged from the flue gas outlet A of the high-pressure combustion device 21.

[0099] (d) The flue gas from the high-pressure combustion device 21 is introduced into the flue gas inlet of the fluid contact device 22, and the collected return water is introduced into the cooling fluid inlet B of the fluid contact device 22. In the fluid contact device 22, the collected return water is sprayed evenly through the nozzle and directly contacts the flue gas for heat exchange, thereby obtaining gas-vapor fluid and liquid. The gas-vapor fluid is discharged from the flue gas outlet C of the fluid contact device 22, and the liquid is discharged from the cooling fluid outlet of the fluid contact device 22.

[0100] In the aforementioned high-pressure combustion devices, the excess air coefficient is relatively large, generally greater than 1.5. The fuel is typically natural gas or associated gas from oil fields. The cooling fluid introduced into the aforementioned partitioned heat exchanger is generally water.

[0101] Furthermore, condenser 102 and condenser 2 103 are used alternately to heat crude oil collection and return water or for other heating purposes, and are used alternately for descaling.

[0102] Furthermore, the flue gas outlet of the fluid contact device 22 is connected to the vent pipe, and the gaseous fluid discharged from the fluid contact device 22 is vented through the vent pipe.

[0103] The above-mentioned Examples 1-3 are injection process modes, which are high-pressure modes, and the pressure within the generating unit is generally 10-21 MPa. However, Example 4 is a water collection and transportation production mode, which does not require high pressure, and the pressure within the generating unit is generally 0.1-0.3 MPa.

[0104] The following points need to be explained:

[0105] (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0106] (2) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0107] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high pressure gas vapor fluid multistage generating system, characterized by, The generating unit comprises N stages of series connection; The generating unit comprises high-pressure combustion device and cooling device connected in series; The high-pressure combustion device comprises combustion-supporting gas inlet, fuel inlet and flue gas outlet A; the flue gas outlet A is connected with the flue gas inlet of the cooling device through a pipeline; The cooling device is a partition heat exchange device or a fluid contact device; The partition heat exchange device comprises flue gas inlet, flue gas outlet B, cooling fluid inlet A and cooling fluid outlet; the cooling fluid and the flue gas perform partition heat exchange; The fluid contact device comprises flue gas inlet, flue gas outlet C, cooling fluid inlet B and spray head; the flue gas inlet is located at the bottom of the fluid contact device, the flue gas outlet C is located at the top of the fluid contact device, and the spray head is arranged at the upper portion of the fluid contact device; the spray head is connected with the cooling fluid inlet B through a pipeline; When N≥2, the flue gas outlet B or the flue gas outlet C of the previous generating unit is connected with the combustion-supporting gas inlet of the high-pressure combustion device of the next generating unit.

2. The high pressure gas vapor fluid multi-stage generating system of claim 1, wherein, The internal pressure of the generating unit is not higher than 25 MPa.

3. The high pressure gas vapor fluid multi-stage generating system of claim 1, wherein, The high-pressure combustion device is a cylindrical pressure-bearing structure, which comprises combustion inner cavity, refractory material, heat preservation material and pressure-resistant outer shell from inside to outside in sequence, and the fuel and the combustion-supporting gas are combusted in the combustion inner cavity.

4. The high pressure gas vapor fluid multi-stage generating system of claim 1, wherein, The fluid contact device further comprises filler and circulating spray pipeline; the filler is arranged in the fluid contact device, and the circulating spray pipeline is arranged at the bottom of the fluid contact device; The cooling fluid and the flue gas perform heat exchange in the filler, The circulating spray pipeline collects liquid at the bottom of the fluid contact device, the liquid flows out through the cooling fluid outlet at the bottom of the fluid contact device, and the liquid is sent into the spray head through a circulating pump.

5. The high pressure gas vapor fluid multi-stage generating system of claim 1, wherein, The cooling fluid outlet at the bottom of the fluid contact device is connected with a pipeline, which is used as the outlet of the water for gathering and transporting crude oil; When the liquid of the cooling fluid outlet is used as the gathering and transporting water for gathering and transporting crude oil, the flue gas outlet C of the Nth generating unit is connected with a venting pipeline.

6. The high pressure gas vapor fluid multi-stage generating system of claim 1, wherein, The cooling fluid outlet of the partition heat exchange device is connected with the cooling fluid inlet A through a pipeline; an expander, a condenser and a booster pump are arranged on the pipeline in sequence.

7. The high pressure gas vapor fluid multi-stage generating system of claim 1, wherein, The cooling fluid introduced into the cooling fluid inlet B of the fluid contact device comprises oily sewage produced in the water flooding, steam flooding, steam huff and puff or SAGD oil production processes in an oil field, or gathering and transporting water of crude oil.

8. The high pressure gas vapor fluid multi-stage generating system of claim 1, wherein, The Nth generating unit is connected with an oil well through a pipeline; the flue gas stream discharged from the flue gas outlet B or the flue gas outlet C of the Nth generating unit is injected into the oil well.

9. The high pressure gas vapor fluid multi-stage generating system of claim 6, wherein, The condenser is two, which are connected in series, alternately operated and alternately perform condenser tube outside descaling.

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