Composite heat fluid generating device, system and method

Abstract

The application provides a composite thermal fluid generating device, system and method, which is arranged in an oil pipe in a well and comprises a generating part and an input pipeline in communication with the generating part; wherein the input pipeline inputs generating raw materials into the generating part, the input pipeline comprises a plurality of input channels for transporting single raw materials, and the input channels comprise a plurality of pipeline areas connected with the generating part and areas between the oil pipe and the pipeline. According to the technical scheme of the application, the device is injected into the oil pipe or taken out from the oil pipe by using a coiled tubing, the operation process is simple and convenient, the cost is low, the heat loss of the composite thermal fluid along the pipeline can be reduced, the heating effect of the oil layer is improved, and the development effect of the oil layer is ensured.

Description

Technical Field

[0001] This invention relates to the field of heavy oil thermal recovery technology, and particularly to a composite thermal fluid generating device, system and method. Background Technology

[0002] Globally, heavy oil resources are abundant, accounting for a large portion of the world's remaining recoverable crude oil reserves. Due to its high density, viscosity, and poor fluidity, heavy oil is poorly developed using conventional cold extraction methods, leading to the development of heavy oil technologies primarily based on thermal extraction. However, the reduced oil-to-steam ratio in the later stages of steam injection development has resulted in decreased economic efficiency. Therefore, various oilfields have conducted multiple attempts to improve steam injection development, including steam and nitrogen, steam and carbon dioxide, and steam and urea co-injection. After trying different technologies, it was found that injecting a composite thermal fluid of steam, carbon dioxide, and nitrogen simultaneously underground has excellent production effects. However, simultaneously generating steam, carbon dioxide, and nitrogen requires steam boilers, carbon dioxide capture devices, and nitrogen separation devices, which are very costly. Currently, most composite thermal fluids are generated through high-temperature combustion systems located on the surface and need to be injected into the formation via surface pipelines and oil lines. The composite thermal fluid experiences significant heat loss along the way, resulting in a decrease in temperature after injection underground, reducing its heating effect on the oil reservoir and thus worsening development results. Summary of the Invention

[0003] To address the problems in the prior art, this application proposes a composite heat fluid generating device, system, and method that can reduce heat loss along the flow path of the composite heat fluid and improve the heat utilization rate of the device.

[0004] The present invention provides a composite thermal fluid generating device, which is installed inside an oil pipe located downhole, and includes a generating component and an input pipeline connected to the generating component;

[0005] The input pipeline supplies raw materials to the generating component. The input pipeline includes multiple input channels for transporting a single raw material. Each input channel includes a region within multiple pipes connected to the generating component and a region between the oil pipe and the pipes.

[0006] In one embodiment, the generating component includes:

[0007] The combustion chamber has an output port;

[0008] A gas chamber, connected to a gas input channel, contains a mixture of natural gas and air inside the gas chamber;

[0009] Water cavity, connecting to the water input channel;

[0010] The gas chamber, water chamber, and combustion chamber are arranged sequentially along the well depth. The mixed gas in the gas chamber can be input into the combustion chamber for combustion to form the target gas. The water in the water chamber can be input into the combustion chamber and heated to form steam. The output port is used to output a composite thermal fluid formed by the mixture of the target gas and the steam. In this embodiment, natural gas and air form a mixed gas in the gas chamber and are output to the combustion chamber for vigorous combustion, generating a large amount of heat and flue gas composed of nitrogen and carbon dioxide. Meanwhile, water in the water chamber is injected into the combustion chamber and heated to form steam. In other words, the nitrogen, carbon dioxide, and steam in the combustion chamber form a composite thermal fluid that is output to the outside through the output port.

[0011] In one embodiment, the air chamber includes a first mixing air chamber and a second mixing air chamber that are in communication with each other;

[0012] In this embodiment, both the first and second mixing chambers are connected to the natural gas input channel in the gas input channel. The first mixing chamber is also connected to the air input channel in the gas input channel. The bottom of the second mixing chamber has a gas delivery channel connected to the combustion chamber. In this embodiment, the natural gas input channel supplies natural gas to both the first and second mixing chambers, while the air input channel supplies air to the first mixing chamber. This means that some of the natural gas in the first mixing chamber is first mixed with air before entering the second mixing chamber to continue mixing with the remaining natural gas, ensuring uniform mixing of natural gas and air. The mixed gas is then delivered to the combustion chamber through the bottom gas delivery channel for combustion. Since the gas chamber is located above the combustion chamber, the heat generated in the combustion chamber can preheat the mixed gas in the gas chamber, improving heat utilization.

[0013] In one embodiment, a rotary mixer is provided inside the gas chamber. The housing of the rotary mixer and the gas chamber form a first mixing gas chamber, and the housing of the rotary mixer forms a second mixing gas chamber. In this embodiment, the gas chamber is divided into two parts by the rotary mixer, and the mixing of natural gas and air can be completed quickly.

[0014] In one embodiment, the water chamber is disposed adjacent to the combustion chamber, and the water chamber includes a first water chamber and a second water chamber that are interconnected.

[0015] In this embodiment, both the first water cavity and the second water cavity extend along the cavity wall of the combustion chamber. The first water cavity is connected to the water input channel, and the second water cavity is connected to the combustion chamber. By setting the water cavity and the combustion chamber adjacent to each other in this embodiment, the water in the water input channel can absorb the heat in the combustion chamber as it passes through the first water cavity and the second water cavity in sequence, thereby achieving the effect of preheating and further improving the utilization rate of the heat in the combustion chamber.

[0016] In one embodiment, a gap exists between the combustion chamber wall and the housing of the generating component. A double-helix liner is provided within the gap, dividing the gap into two independent parts. One part is the second water chamber, and the other part is an air intake channel communicating with the first mixing chamber. In this embodiment, by utilizing the gap between the combustion chamber and the housing of the generating component, both the gas entering the air intake channel and the liquid entering the second water chamber can be preheated under the high temperature of the combustion chamber. Furthermore, the double-helix liner not only separates the air intake channel from the second water chamber but also increases the travel path of the gas or liquid and reduces its cross-sectional area, allowing it to be fully preheated within the gap. Moreover, the area of ​​the gap does not need to be set too large, avoiding an overall size of the generating device that would prevent it from being unable to be inserted into the oil pipe.

[0017] In one embodiment, an ignition device is also included. The ignition device includes an electromagnetic induction coil disposed on the outside of the housing of the generating component and an ignition steel ring disposed on the inner wall of the combustion chamber. In this embodiment, the electromagnetic induction coil disposed on the outside of the housing controls the heating of the ignition steel ring on the inner wall of the combustion chamber, thereby realizing the ignition of the mixed gas in the combustion chamber. This avoids the igniter wiring and other components from directly contacting the flame, ensuring the safety of the igniter. It also reduces the number of pipelines at the top of the device, making it easier for the generating device to be lowered into the oil pipe at the bottom of the well, facilitating alternating steam injection operations in multiple wells, and improving the utilization rate of the equipment.

[0018] In one embodiment, the air intake passage extends along the cavity wall of the combustion chamber, and the air intake hole of the air intake passage is disposed on the housing of the generator component. The air intake hole is located in the bottom region of the combustion chamber. With this embodiment, when air enters the housing from outside the generator component, it enters the air chamber from bottom to top along the cavity wall of the combustion chamber, ensuring that the heat in the combustion chamber can be fully utilized.

[0019] The present invention also provides a composite thermal fluid generation system, including the generation device as described above, wherein the generation device enters and exits the interior of the oil pipe through a continuous oil pipe, and the generation device is interconnected with a raw material storage device on the ground.

[0020] The present invention also provides a method for generating a composite thermal fluid, comprising:

[0021] Air, natural gas, and water are respectively fed into the generating unit located inside the oil pipeline;

[0022] The mixture of air and natural gas is fed into the combustion chamber for combustion to produce the target gas.

[0023] Water is sprayed into the combustion chamber and heated to generate steam; the target gas and the steam are mixed to form a composite thermal fluid before being output.

[0024] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0025] The composite thermal fluid generating device, system, and method provided by this invention have at least the following advantages compared with the prior art:

[0026] (1) Reduce the heat loss along the flow path of the composite heat fluid, improve the heating effect of the oil layer, and ensure the development effect of the oil layer.

[0027] (2) The entire device is injected into the tubing or removed from the tubing using a continuous tubing. The operation is simple and convenient, and the cost is low.

[0028] (3) The natural gas in the combustion chamber is ignited by electromagnetic induction coil and special ignition steel ring, avoiding direct contact between the igniter circuit and the flame, making the igniter safer and more durable, and also reducing the number of pipelines at the top of the device.

[0029] (4) Using a double spiral liner, the air and water on both sides can be preheated by the combustion chamber, so that there is basically no heat loss in the combustion chamber. Attached Figure Description

[0030] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0031] Figure 1 A schematic diagram of the generating device of the present invention being lowered to the bottom of a well is shown;

[0032] Figure 2 A schematic diagram of the generating apparatus of the present invention is shown;

[0033] Figure 3 Showing Figure 2 Structural schematic diagrams of the cross sections in the AA and BB directions;

[0034] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0035] Figure label:

[0036] 1-Oil pipe, 2-Continuous oil pipe, 3-Water input channel, 4-Upper end cap bolt, 5-Thermal expansion packer, 6-Lower end cap bolt, 7-Sleeve, 8-Generating component, 9-Electromagnetic coil cable, 10-Flame detector cable, 11-Continuous oil pipe wall, 12-Flame detector and pressure sensor cable, 13-Water pipe wall, 14-Sealing ring, 15-First natural gas inlet, 16-Second natural gas inlet, 17-First air outlet, 18-Water cavity, 19-Outer wall of generating unit, 20-Electromagnetic induction coil, 21-First pressure sensor, 22-Ignition steel ring, 23-Air inlet, 24-High temperature insulation liner, 2 5-Mixing chamber shell, 26-Combustion chamber sealing shell, 27-Mixing chamber, 28-Water outlet, 29-Double spiral liner, 30-Combustion chamber, 31-Flame monitor, 32-First water inlet, 33-First air inlet channel, 34-Air inlet of air chamber, 35-Rotating mixer, 36-Second pressure sensor, 37-Air chamber, 38-Continuous oil pipe annulus, 39-Water pipe interior, 40-Continuous oil pipe outer wall, 41-Third natural gas inlet, 42-Fourth natural gas inlet, 43-Second air outlet, 44-Second water inlet, 45-Water chamber outer wall, 46-Second air inlet channel, 47-Air chamber upper shell wall, 48-Water inlet channel. Detailed Implementation

[0037] The invention will now be further described with reference to the accompanying drawings.

[0038] Example 1

[0039] Typical integrated steam, carbon dioxide, and nitrogen generators are typically installed on the ground due to their size and the number of pipelines. The resulting composite thermal fluid needs to be injected into the formation through ground pipelines and oil pipes, resulting in significant heat loss along the way. Consequently, the temperature of the composite thermal fluid decreases after being injected underground, reducing its heating effect on the oil layer and worsening the development results.

[0040] A composite thermal fluid generating device of the present invention is installed inside an oil pipe 1 located downhole, and includes a generating component 8 and an input pipeline communicating with the generating component 8;

[0041] The input pipeline supplies raw materials to the generating component 8 inside the oil pipe 1. The input pipeline includes multiple input channels for transporting a single raw material. The input channels include areas within multiple pipes connected to the generating component 8 and areas between the oil pipe 1 and the pipes.

[0042] It should be noted that when natural gas, air and water are simultaneously input into the generating component, they can be transported separately through three independent pipelines set in oil pipe 1, or the annular area between oil pipe 1 and the pipeline can be used as a raw material transportation pipeline to save costs; multiple independent pipelines can also adopt a ring structure like concentric circles, with multiple pipelines spaced apart on one pipeline, further reducing the overall volume of the pipeline and making it easier to be lowered into oil pipe 1.

[0043] Furthermore, the generating components include:

[0044] Combustion chamber 30 has an output port;

[0045] Gas chamber 37 is connected to the gas input channel, and the interior of gas chamber 37 contains a mixture of natural gas and air.

[0046] Water cavity 18, connected to water input channel 3;

[0047] The gas chamber 37, water chamber 18, and combustion chamber 30 are sequentially arranged along the well depth. The mixed gas in the gas chamber 37 can be input into the combustion chamber 30 for combustion to form the target gas. The water in the water chamber 18 can be input into the combustion chamber 30 and heated to form steam. The outlet is used to output the composite thermal fluid formed by the mixture of the target gas and steam. After natural gas and air form a mixed gas in the gas chamber, it is output to the combustion chamber for violent combustion, generating a large amount of heat and flue gas composed of nitrogen and carbon dioxide. The water in the water chamber 18 is injected into the combustion chamber and heated to form steam. That is, the nitrogen, carbon dioxide, and steam in the combustion chamber form a composite thermal fluid and are output to the outside through the outlet. In other words, by transporting the raw materials from the surface to the well, the composite thermal fluid is generated downhole, directly heating the oil layer, ensuring the heating effect on the oil layer, and improving the extraction efficiency of heavy oil.

[0048] Furthermore, the air chamber 37 includes a first mixing air chamber and a second mixing air chamber that are interconnected;

[0049] Both the first and second mixing chambers are connected to the natural gas input channel in the gas input channel. The first mixing chamber is also connected to the air input channel in the gas input channel. The bottom of the second mixing chamber has a gas delivery channel connected to the combustion chamber. The natural gas input channel inputs natural gas into the first and second mixing chambers respectively, while the air input channel inputs air into the first mixing chamber. That is, in the first mixing chamber, some natural gas is first mixed with air before entering the second mixing chamber to continue mixing with the remaining natural gas, ensuring that the natural gas and air are mixed evenly. The mixed gas is delivered to the combustion chamber for combustion through the gas delivery channel at the bottom. That is, the gas chamber 37 is located above the combustion chamber 30, so that the heat generated in the combustion chamber 30 can preheat the mixed gas in the gas chamber 37, improving the heat utilization rate.

[0050] Specifically, a rotary mixer 35 is provided inside the gas chamber. A first mixing chamber is formed between the housing of the rotary mixer 35 and the gas chamber 37, and a second mixing chamber is formed inside the housing of the rotary mixer 35. The rotary mixer 35 divides the gas chamber 37 into two parts, and can also quickly complete the mixing of natural gas and air.

[0051] Furthermore, the water chamber 18 is arranged adjacent to the combustion chamber 30, and the water chamber 18 includes a first water chamber and a second water chamber that are interconnected.

[0052] The first water cavity and the second water cavity both extend along the cavity wall of the combustion cavity 30. The first water cavity is connected to the water input channel 3, and the second water cavity is connected to the combustion cavity 30. The water cavity 18 is arranged adjacent to the combustion cavity 30 so that the water in the water input channel 3 can absorb the heat in the combustion cavity 30 when it passes through the first water cavity and the second water cavity in sequence, thereby achieving the preheating effect and further improving the utilization rate of the heat in the combustion cavity.

[0053] Furthermore, the air intake channel of the first mixing chamber and the second water chamber are both located in the gap between the combustion chamber 30 and the housing of the generating component 8. A double-helix liner 29 is provided in the gap to separate the air intake channel and the second water chamber. By utilizing the gap between the combustion chamber 30 and the housing of the generating component 8, the gas entering the air intake channel and the liquid entering the second water chamber can be preheated under the high temperature of the combustion chamber 30. The double-helix liner 29 not only separates the air intake channel and the second water chamber from each other, but also increases the travel path of the gas or liquid and reduces its cross-sectional area, so that it can be fully preheated in the gap. It is not necessary to set the area of ​​the gap too large, so as to avoid the overall volume of the generating device being too large to be inserted into the oil pipe.

[0054] Specifically, the double-helix liner 29 is made of aluminum. When aluminum comes into contact with oxygen in the air, it forms an aluminum oxide film, which improves its corrosion resistance.

[0055] Furthermore, it also includes an ignition device, which includes an electromagnetic induction coil 20 installed on the outer wall 19 of the generator and an ignition steel ring 22 installed on the inner wall of the combustion chamber 30. The electromagnetic induction coil 20 controls the heating of the ignition steel ring 22 on the inner wall of the combustion chamber 30, thereby igniting the mixed gas in the combustion chamber 30. This avoids direct contact between the igniter wiring and the flame, ensuring the safety of the igniter. It also reduces the number of pipelines at the top of the device, making it easier for the generator to be lowered into the oil pipe at the bottom of the well, facilitating alternating steam injection operations in multiple wells, and improving the utilization rate of the equipment.

[0056] Furthermore, the air intake passage extends along the cavity wall of the combustion chamber 30, and the air intake hole 23 of the air intake passage is provided on the housing of the generator component 8. The air intake hole 23 is located in the bottom region of the combustion chamber 30, so that when air enters the housing from outside the housing of the generator component 8, it enters the air chamber 37 from bottom to top along the cavity wall of the combustion chamber 30, ensuring that the heat in the combustion chamber 30 can be fully utilized.

[0057] Furthermore, pressure sensors electrically connected to the ground display device are installed inside the housing of both the gas chamber 37 and the generating component 8. The pressure sensors transmit the pressure data of the current position to the ground in real time, so that the staff can keep track of the pressure of the gas injected into the well, ensuring the safety of the downhole operation. At the same time, the flow rate of the injected gas can be adjusted in real time as needed.

[0058] Furthermore, it also includes a flame monitor 31 installed in the combustion chamber 30, which is electrically connected to the ground display device to monitor the flame combustion in the combustion chamber 30 in real time, so that the operator can adjust the ratio and flow rate of the injected air and natural gas as needed.

[0059] Example 2

[0060] A composite heat fluid generating device of the present invention, such as Figure 1 As shown, the device is installed inside the oil pipe 1, which is fixed inside the casing 7. The device includes a generating component 8 and an input pipeline connected to the generating component 8.

[0061] The input pipeline supplies the generating raw materials to the generating unit 8 inside the oil pipe. The input pipeline includes a gas input channel and a water input channel 3. The gas input channel includes a natural gas input channel and an air input channel.

[0062] Specifically, such as Figure 1 and Figure 2 As shown, the generating component 8 is lowered into the tubing 1 through the coiled tubing 2. The annular area between the tubing 1 and the coiled tubing 2 is the air input channel, into which air is input. The coiled tubing 2 has a water input channel 3, and the two are in a concentric ring structure, into which softened water is input. The annular area between the water input channel 3 and the coiled tubing 2 is the natural gas input channel, into which natural gas is input.

[0063] Furthermore, such as Figure 1 and Figure 2 As shown, the generating component 8 is connected to the input channel via the upper end cap bolt 4, and the generating component 8 is connected to the mixing chamber 27 of the composite heat fluid via the lower end cap bolt 6.

[0064] The generating component 8 includes:

[0065] The combustion chamber 30 has an output port, which is connected to the mixing chamber 27.

[0066] Gas chamber 37 is connected to the gas input channel, and the interior of gas chamber 37 contains a mixture of natural gas and air.

[0067] Water cavity 18, connected to water input channel 3;

[0068] The mixed gas in the gas chamber 37 can be input into the combustion chamber 30 to burn and form nitrogen and carbon dioxide, and the water in the water chamber 18 can be input into the combustion chamber 30 and heated to form steam.

[0069] Specifically, such as Figure 2 As shown, the air chamber 37 is divided into left and right parts by the water chamber 18, and both the air chamber 37 and the water chamber 18 are located above the combustion chamber 30 and adjacent to the combustion chamber 30. This makes full use of the heat generated when the combustion chamber 30 is working, so that the mixed gas in the air chamber 37 and the water in the water chamber 18 can be preheated, thereby improving the heat utilization efficiency.

[0070] Specifically, such as Figure 2 As shown, the gas chamber 37 has a rotary mixer 35 for mixing gases. Two spaced-apart first natural gas inlets 15 and second natural gas inlets 16 are located at the top of the gas chamber 37. Both the first and second natural gas inlets 15 are located within the continuous tubing annulus 38. Natural gas enters the gas chamber 37 through the annulus 38 via the first and second natural gas inlets 15 and 16, respectively. The first natural gas inlet 15 is located outside the rotary mixer 35, while the second natural gas inlet 16... 6 is connected to the interior of the rotary mixer 35. Air enters the outside of the double helical liner 29 through the air input channel and then through the air inlet 23 on the outer shell of the generator component 8 until it enters the gas chamber 37 through the first air outlet 17. After being mixed evenly with the natural gas outside the rotary mixer 35 under the action of the rotary mixer 35, it enters the interior of the rotary mixer 35 through the gas chamber inlet 34 and mixes again with a part of the natural gas entering through the second natural gas inlet 16. Then it enters the combustion chamber 30 through the first air intake channel 33 for combustion.

[0071] Specifically, such as Figure 2 As shown, the gap between the gas chamber 37 and the continuous oil pipe wall 11 is filled with a sealing ring 14 to prevent gas leakage.

[0072] Specifically, such as Figure 2As shown, the softened water in the water input channel 3 enters the water chamber 18 through the inside of the water pipe 39, where it undergoes the first preheating. The softened water then enters the first water inlet 32 ​​from the water chamber 18, and then enters the inner side of the double spiral liner 29 through the first water inlet 32 ​​for the second preheating. Finally, the softened water is sprayed out through the water outlet 28, where it encounters the high-temperature flue gas generated by combustion and undergoes vaporization to form steam.

[0073] Specifically, such as Figure 2 and Figure 3 As shown, the outer wall 45 of the water cavity and the outer wall 40 of the continuous oil pipe are arranged adjacent to each other and form a concentric ring structure. The bottom of the water pipe wall 13 extends towards the interior 39 of the water cavity to form a water inlet channel 48.

[0074] Specifically, in order to more clearly describe the detailed structural features of this device, Figure 2 and Figure 3 Display accordingly. Figure 3 The third natural gas inlet 41 and Figure 2 The first natural gas inlet 15 in the middle corresponds to each other. Figure 3 The fourth natural gas inlet 42 and Figure 2 The second natural gas inlet 16 in the middle corresponds to each other.

[0075] Figure 3 The second air outlet 43 in the middle and Figure 2 The first air outlet 17 in the middle corresponds to each other.

[0076] Figure 3 The second water inlet hole 44 and Figure 2 The first water inlet holes 32 in the middle correspond to each other.

[0077] Figure 3 The second air intake passage 46 in the middle and Figure 2 The first air intake channel 33 in the middle corresponds to each other.

[0078] Figure 2 The air chamber inside the oil pipe 1 consists of two parts separated by the water inlet channel 48, such as Figure 3 As shown, the third natural gas inlet 41 and the fourth natural gas inlet 42 are both installed through the upper shell wall 47 of the gas chamber.

[0079] It should be noted that the water in the water chamber is injected into the combustion chamber and is heated to form steam. That is, the nitrogen, carbon dioxide and steam in the combustion chamber are mixed to form a composite hot fluid, which is output outward from the outlet.

[0080] Furthermore, an ignition steel ring 22 is provided on the inner side of the combustion chamber 30, and an electromagnetic induction coil 20 corresponding to the position of the ignition steel ring 22 is provided on the outer side of the housing of the generating component 8. The mixture in the combustion chamber 30 is ignited by heating the ignition steel ring 22 with the electromagnetic induction coil 20. This ignition method can avoid the direct contact between the wiring of conventional igniters and the flame, ensuring the safety of the igniter. It also reduces the number of pipelines at the top of the device, making it easier for the generating device to be lowered into the oil pipe at the bottom of the well, facilitating the alternating steam injection operation in multiple wells, and improving the utilization rate of the equipment.

[0081] Specifically, the electromagnetic induction coil 20 is connected to an electromagnetic coil cable 9 that runs from the ground into the well. Workers can complete the ignition operation by operating the electromagnetic coil cable 9 from the ground.

[0082] Furthermore, the double-helix liner 29 is made of aluminum. When aluminum comes into contact with oxygen in the air, it forms an aluminum oxide film, which improves its corrosion resistance. Since aluminum is not magnetic, it will not be affected by the electromagnetic induction coil 20 during the ignition process of the ignition ring 22.

[0083] Furthermore, such as Figure 2 As shown, a high-temperature heat insulation liner 24 is also provided on the inner wall of the combustion chamber 30, and the ignition steel ring 22 is installed on the high-temperature heat insulation liner 24.

[0084] Furthermore, such as Figure 2 As shown, the bottom of the combustion chamber 30 is connected to the mixing chamber 27, and the top of the mixing chamber 27 is provided with an arched combustion chamber sealing shell 26, which forms a funnel-shaped structure with the combustion chamber 30. This allows the carbon dioxide, nitrogen and steam generated in the combustion chamber 30 to be concentratedly transported to the mixing chamber 27 and mixed during the transport process, ensuring that the carbon dioxide, nitrogen and steam can be fully mixed to form a composite heat fluid.

[0085] Specifically, the bottom of the combustion chamber 30 and the top of the mixing chamber shell 25 of the mixing chamber 27 both have outwardly protruding snap-fit ​​parts, which match each other and are fixed together by the lower end cover bolt 4.

[0086] Furthermore, such as Figure 1 As shown, a thermal expansion packer 5 is installed between the combustion chamber sealing shell 26 and the tubing 1. When the composite hot fluid is output through the mixing chamber 27, the resulting high temperature will cause the thermal expansion packer 5 to expand due to heat, effectively sealing the annular area between the tubing 1 and the continuous tubing 2, ensuring that the composite hot fluid is only injected into the formation and does not return. At the same time, after the gas injection work is completed and the injection of composite hot fluid is stopped for a period of time, the thermal expansion packer 5 cools down and shrinks and separates. At this time, the continuous tubing 2 can be lifted and the generating component 8 can be taken out, so that the oil well can start normal production.

[0087] Furthermore, such as Figure 1 and Figure 2 As shown, a flame monitor 31 is installed on the top of the combustion chamber 30, and the flame monitor 31 is connected to a flame monitor cable 10 that runs from the ground into the well. A first pressure sensor 21 is installed on the outside of the housing of the combustion chamber 30 and above the air inlet 23. A second pressure sensor 36 is installed in the air chamber 37. The first pressure sensor 21 and the second pressure sensor 36 are connected to a pressure sensor cable 12 that runs from the ground into the well. The flame monitor cable 10 and the pressure sensor cable 12 are both laid on the housing of the water pipe wall 13, which makes it convenient for the operator to adjust the ratio and flow rate of the air and natural gas injected into the well in real time.

[0088] Example 3

[0089] The present invention provides a composite thermal fluid generation system, including the generation device described in Example 2, and multiple raw material storage devices installed on the surface of the well, which respectively store natural gas, air and softened water. Each raw material storage device is also connected to a corresponding raw material preparation device. The preparation of raw materials is common knowledge to those skilled in the art and will not be described in detail here. The system also includes a display and control device electrically connected to an electromagnetic coil cable, a flame detector cable and a pressure sensor cable, which facilitates the operator to monitor and adjust the generation of the downhole composite thermal fluid.

[0090] Example 4

[0091] A method for generating a composite thermal fluid according to the present invention includes:

[0092] Step S10: Introduce air, natural gas, and water into the generating unit located in the oil pipeline, respectively;

[0093] Step S20: The mixture of air and natural gas is uniformly mixed and then fed into the combustion chamber for combustion to produce the target gas;

[0094] Step S30: Water is sprayed into the combustion chamber, heated to generate steam, and the target gas is mixed with the steam to form a composite thermal fluid before being output.

[0095] Furthermore, in step S10, air and natural gas are respectively introduced into the gas chamber of the generator, and softened water is introduced into the water chamber of the generator;

[0096] Air is introduced through the annular region between the tubing and the coiled tubing, natural gas is introduced through the annular region between the coiled tubing and the water pipe corresponding to the water chamber, and softened water is introduced through the water pipe.

[0097] It should be noted that by utilizing the annular structure of the tubing and coiled tubing, the volume of the generating device is reduced, making it easier to lower the generating device into the tubing. At the same time, by using the method of inputting air and natural gas downhole and then igniting the mixed gas, the heat loss of the composite thermal fluid along the way from the surface to the well is greatly reduced, thereby improving the heating effect on the oil reservoir and ensuring the development effect of the oil reservoir.

[0098] Furthermore, in step S20, an electromagnetic coil is used to heat the ignition steel ring in the combustion chamber to ignite the gas mixture.

[0099] It should be noted that conventional ignition devices have many wires and are prone to direct contact with the flame, making them easily damaged. In addition, the numerous wires make it difficult to insert this device into the narrow oil pipe. By using an electromagnetic induction coil to heat the ignition steel ring, the mixed gas in the combustion chamber is ignited, which facilitates alternating steam injection operations in multiple wells and improves the utilization rate of the equipment.

[0100] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0101] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A composite heat fluid generating device, characterized in that, It is installed inside the tubing located downhole and includes a generating component and an input pipeline connected to the generating component; The input pipeline supplies raw materials to the generating unit. The input pipeline includes multiple input channels for transporting a single raw material. Each input channel includes a region within multiple pipes connected to the generating unit and a region between the oil pipe and the pipes. The generating component includes: The combustion chamber has an output port; A gas chamber, connected to a gas input channel, contains a mixture of natural gas and air inside the gas chamber; Water cavity, connecting to the water input channel; The gas chamber, water chamber, and combustion chamber are arranged sequentially along the well depth. The mixed gas in the gas chamber can be input into the combustion chamber to burn and form the target gas. The water in the water chamber can be input into the combustion chamber and heated to form steam. The output port is used to output the composite hot fluid formed by the mixture of the target gas and the steam. The air chamber includes a first mixing air chamber and a second mixing air chamber that are interconnected. The first mixing chamber and the second mixing chamber are both connected to the natural gas input channel in the gas input channel. The first mixing chamber is connected to the air input channel in the gas input channel. The bottom of the second mixing chamber has a gas delivery channel that is connected to the combustion chamber. The water chamber is disposed adjacent to the combustion chamber, and the water chamber includes a first water chamber and a second water chamber that are interconnected. The first water cavity and the second water cavity both extend along the cavity wall of the combustion chamber, the first water cavity is connected to the water input channel, and the second water cavity is connected to the combustion chamber; There is a gap between the cavity wall of the combustion chamber and the housing of the generating component. A double helical liner is provided in the gap, which divides the gap into two independent parts. One part is the second water chamber, and the other part is an air intake channel that communicates with the first mixing chamber.

2. The composite heat fluid generating device according to claim 1, characterized in that, A rotary mixer is provided inside the air chamber. The first mixing air chamber is formed between the housing of the rotary mixer and the air chamber, and the second mixing air chamber is formed inside the housing of the rotary mixer.

3. The composite heat fluid generating device according to claim 1, characterized in that, It also includes an ignition device, which includes an electromagnetic induction coil disposed on the outside of the housing of the generating component and an ignition steel ring disposed on the inner wall of the combustion chamber.

4. The composite heat fluid generating device according to claim 1, characterized in that, The air intake passage extends along the cavity wall of the combustion chamber, and the air intake hole of the air intake passage is disposed on the housing of the generator component, and the air intake hole is located in the bottom region of the combustion chamber.

5. A composite heat fluid generation system, characterized in that, Includes the generating device as described in any one of claims 1-4, wherein the generating device enters and exits the interior of the oil pipe via a continuous oil pipe, and the generating device is interconnected with the raw material storage device on the ground.

6. A method for generating a composite thermal fluid, characterized in that, include: Air, natural gas, and water are respectively introduced into a generating device located inside an oil pipeline; wherein the generating device is the composite thermal fluid generating device according to any one of claims 1-4; The mixture of air and natural gas is fed into the combustion chamber for combustion to produce the target gas. Water is sprayed into the combustion chamber and heated to generate steam; the target gas and the steam are mixed to form a composite thermal fluid before being output.

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