A method and device for reducing viscosity of thick oil by using supercritical water oxidation heat release

Abstract

The application discloses a method and device for reducing viscosity of thick oil by supercritical water oxidation and heat release, which provides materials through a water tank, a fuel tank and a compressor and is lowered into a horizontal well from a gas injection inlet through a continuous pipeline; a preheater and a supercritical reactor under the well are connected through the continuous pipeline; the continuous pipeline is connected through a pipeline connecting device; high-pressure water is delivered through a water pump and fuel is delivered through a high-pressure fuel pump to generate supercritical carbon dioxide, supercritical water and hydrogen; the water and the fuel injected from the well mouth are continuously converted into supercritical multi-component thermal fluid composed of water vapor, carbon dioxide and hydrogen, the supercritical multi-component thermal fluid is injected into an oil layer through a screen pipe through a gas outlet, and the supercritical multi-component thermal fluid is used to reduce the viscosity of thick oil and then is produced; the device comprises a pipeline main body, a sleeve, a bottom pipe arranged on one side of the sleeve and a connecting pipe arranged on the side of the sleeve away from the bottom pipe; and a connecting assembly is arranged at both ends of the sleeve, so that the pipeline can be conveniently mounted, dismounted and fixed, and work efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heavy oil recovery, in particular to a method and device for supercritical water oxidation heat release heavy oil viscosity reduction injection and recovery. BACKGROUND

[0002] The working principle of the traditional multi-element thermal fluid recovery technology is to use the combustion injection mechanism of a space rocket engine, fix a high-pressure combustion chamber in a cabin, and inject the mixed gas of high-temperature and high-pressure water vapor, carbon dioxide and nitrogen generated after ignition and combustion into an oil layer, so as to increase the pressure of the oil layer, reduce the viscosity of the oil layer, improve the oil displacement area, and achieve the purpose of improving the recovery rate. However, the traditional multi-element thermal fluid recovery technology has the following disadvantages: 1) it is highly dependent on diesel oil and has high cost; 2) the water treatment process is complex and cannot directly use platform waste water such as heavy oil production water; 3) the combustion temperature is high and the heat dissipation is serious, the connected pipeline also has the problems of wide distribution and being arranged underground, which leads to difficult installation and removal, and the sealing performance of the pipeline may decrease in a long time of use, resulting in resource leakage and safety hazards. SUMMARY

[0003] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0004] In view of the above-mentioned existing problems, the present application is proposed.

[0005] Therefore, the purpose of the present application is to provide a method and device for supercritical water oxidation heat release heavy oil viscosity reduction injection and recovery.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a method for supercritical water oxidation heat release heavy oil viscosity reduction injection and recovery,

[0007] The materials are provided by the water tank, fuel tank and compressor and are injected into the horizontal well through the continuous pipeline from the gas injection inlet;

[0008] The preheater and the supercritical reactor underground are connected by the continuous pipeline;

[0009] The continuous pipeline is connected by the pipeline connection device (C);

[0010] The high-pressure water is transported by the water pump, the water is heated to a supercritical state by the heater in the supercritical reactor, and then the fuel is transported by the high-pressure fuel pump to generate supercritical carbon dioxide, supercritical water and hydrogen;

[0011] The water and fuel injected through the wellhead are continuously converted into supercritical multi-component thermal fluid composed of water vapor, carbon dioxide and hydrogen, which is injected into the oil layer through the gas outlet and the screen pipe.

[0012] The supercritical multi-component thermal fluid is used to reduce the viscosity of the heavy oil and then extract the heavy oil.

[0013] As a preferred scheme of the method for injecting and extracting heavy oil by using supercritical water oxidation heat release to reduce the viscosity of the heavy oil, the high-pressure water is generated by pressurizing the normal-temperature low-pressure water to 22.1-30 MPa by a high-pressure water pump, the high-pressure fuel is obtained by pressurizing the fuel to 22.1-30 MPa by a fuel pressurizing pump, the compressed air is compressed to 22.1-30 MP by a low-pressure compressor and a high-pressure compressor, and the resistance wire in the reactor is powered by a ground generator.

[0014] As a preferred scheme of the method for injecting and extracting heavy oil by using supercritical water oxidation heat release to reduce the viscosity of the heavy oil, one continuous pipe has fuel and water conveying passages, the other two continuous pipes convey compressed air, each continuous pipe has a separate power passage, mineral insulation is used to ensure that the power passage and other passages do not affect each other, and various passages are combined in the continuous pipe, which is also beneficial to the arrangement of the pipe in the well and can save operation cost.

[0015] As a preferred scheme of the method for injecting and extracting heavy oil by using supercritical water oxidation heat release to reduce the viscosity of the heavy oil, the fuel uses organic wastewater such as heavy oil production water as material, thereby reducing the cost of using diesel oil.

[0016] As a preferred scheme of the method for injecting and extracting heavy oil by using supercritical water oxidation heat release to reduce the viscosity of the heavy oil, packers are added between different continuous pipes to prevent mutual influence between different pipes, nitrogen is filled in the straight well part to reduce heat loss.

[0017] As a preferred scheme of the method for injecting and extracting heavy oil by using supercritical water oxidation heat release to reduce the viscosity of the heavy oil, high-pressure water is preferentially injected for heating, high-pressure fuel is injected only after the water is heated to 374 DEG C in the supercritical reactor to enter the supercritical state, and the high-pressure fuel absorbs heat in the supercritical water to perform gasification reaction in the supercritical reactor.

[0018] As a preferred scheme of the method for reducing viscosity and injection mining of thick oil by supercritical water oxidation exothermic reaction of the present application, the compressed air is preheated, the gasification reaction product is supercritical water, hydrogen and carbon dioxide, the hydrogen is mixed with oxygen in the compressed air and combusted to 374-700 DEG C, a supercritical multi-component thermal fluid mixed with supercritical high-pressure water, carbon dioxide gas and residual nitrogen and air is formed, a large amount of heat is released, the exothermic reaction is carried out in the oil layer, so that the generated heat is all used for heating and diluting the thick oil, the heat loss is close to 0, and the generated multi-component thermal fluid can also improve the mining efficiency of the thick oil.

[0019] As a preferred scheme of the method for reducing viscosity and injection mining of thick oil by supercritical water oxidation exothermic reaction of the present application, part of the heat generated by the exothermic reaction can supplement the heat required by the gasification reaction, so that the power of the heater can be reduced in the later period, energy waste is avoided, the thick oil heated and diluted is shut down for 3-15 days, and then the well is opened for production after the pressure between the casing and the tubing is stabilized.

[0020] The present application has the advantages that the exothermic reaction is carried out in the oil layer, the generated heat is all used for heating and diluting the thick oil, the heat loss is close to 0, the generated multi-component thermal fluid can also improve the mining efficiency of the thick oil, part of the heat generated by the exothermic reaction can supplement the heat required by the gasification reaction, so that the power of the heater can be reduced in the later period, and energy waste is avoided.

[0021] In view of the above-mentioned existing problems, the present application is proposed.

[0022] Therefore, the present application aims to provide a device for reducing viscosity and injection mining of thick oil by supercritical water oxidation exothermic reaction.

[0023] To solve the above technical problems, the present application provides the following technical scheme: a device for reducing viscosity and injection mining of thick oil by supercritical water oxidation exothermic reaction, comprising the pipeline connecting device of any one of the above-mentioned devices, a pipeline main body comprising a casing, a bottom pipe arranged on one side of the casing and a connecting pipe arranged on the side of the casing away from the bottom pipe, and a connecting assembly arranged at both ends of the casing.

[0024] As a preferred scheme of the device for reducing viscosity and injection mining of thick oil by supercritical water oxidation exothermic reaction of the present application, the connecting assembly comprises a second connecting component arranged on the side of the casing close to the bottom pipe, a first connecting component arranged on the side of the casing close to the connecting pipe, a anti-disengagement component arranged on the side of the first connecting component away from the bottom pipe, a stabilizing component arranged on the side of the second connecting component close to the connecting pipe, and an unlocking component arranged in the casing.

[0025] The present application has the advantages that the connecting assembly is arranged at both ends of the casing, the installation, disassembly and fixation of the pipeline are convenient, and the working efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings. Among them:

[0027] Figure 1 The schematic diagram of the steps of the method for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0028] Figure 2 The schematic diagram of the device system structure of the method for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0029] Figure 3 The schematic diagram of the supercritical water reactor structure of the method for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0030] Figure 4 The schematic diagram of the overall structure of the device for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0031] Figure 5 The schematic diagram of the connection assembly explosion structure of the device for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0032] Figure 6 The schematic diagram of the connection pipe fracture structure of the device for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0033] Figure 7 The schematic diagram of the casing section structure of the device for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0034] Figure 8 The schematic diagram of the Figure 7 structure at A of the device for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0035] Figure 9 The schematic diagram of the bottom pipe section structure of the device for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0036] Figure 10 The schematic diagram of the overall section structure of the device for reducing viscosity and injection of thick oil by supercritical water oxidation exothermic of the present application.

[0037] Figure 11 The schematic diagram of the Figure 10Structure schematic diagram at B.

[0038] Figure 12 Structure schematic diagram of casing internal explosion for the device for utilizing supercritical water oxidation to reduce viscosity of thick oil.

[0039] Figure 13 Structure schematic diagram of casing internal explosion for the device for utilizing supercritical water oxidation to reduce viscosity of thick oil. Figure 12 Structure schematic diagram at C.

[0040] Figure 14 Structure schematic diagram of casing internal explosion for the device for utilizing supercritical water oxidation to reduce viscosity of thick oil. Figure 12 Structure schematic diagram of bottom part at D. DETAILED DESCRIPTION

[0041] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0042] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, but the present application can be practiced in other different manners than those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0043] Secondly, the "one embodiment" or "embodiment" referred to herein can include specific features, structures or characteristics included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0044] Thirdly, the present application is described in detail in combination with the schematic diagram, and in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual manufacture.

[0045] Embodiment 1

[0046] With reference to Figures 1-3 , a method for utilizing supercritical water oxidation to reduce viscosity of thick oil is provided, comprising the following steps:

[0047] S1: providing materials through a water tank, a fuel tank and a compressor, and lowering into a horizontal well from a gas injection inlet through a continuous pipeline.

[0048] Specifically, three continuous pipes enter into the horizontal well from the gas injection inlet, one of which has a channel for delivering fuel and water, the other two have channels for delivering air, each of which has a separate power channel, one of which has a channel for delivering fuel and water, the other two deliver compressed air, each of which has a separate power channel, mineral insulation is used to ensure that the power and other channels do not affect each other, and various channels are combined in the continuous pipe, which is also more conducive to the arrangement of the pipe in the well and can save operation cost.

[0049] S2: connecting the preheater and the supercritical reactor in the well through the continuous pipe.

[0050] Specifically, the continuous pipe needs to be connected with the preheater and the supercritical water reactor in the well, and the continuous pipe is connected through the pipe connecting device (C), the continuous pipe is lowered into the horizontal well from the gas injection inlet, the continuous pipe is first connected with the water tank and the fuel tank on the ground through the pump, and then connected with the preheater and the supercritical reactor in the well in sequence; the other two continuous pipes are connected with the gas source through the compressor, and the compressed gas is sent into the well from the wellhead, and then connected with the preheater and the gas outlet in the well in sequence, and packers are added between different continuous pipes to prevent mutual influence between different pipes, and nitrogen is filled in the straight well part to reduce heat loss.

[0051] S3: delivering high-pressure water through the water pump, heating the water to the supercritical state through the heater in the supercritical reactor, and then delivering fuel through the high-pressure fuel pump to generate supercritical carbon dioxide, supercritical water and hydrogen.

[0052] Specifically, the preheated high-pressure water in the continuous pipe is first sent into the supercritical water reactor through the ejector, the water is heated to the supercritical state by the resistance wire, and then the fuel is injected, the fuel will be gasified in the supercritical water, and converted into gasification products mainly composed of hydrogen and carbon dioxide,

[0053] The high-pressure water is pressurized to 22.1MPa-30MPa by the high-pressure water pump, the high-pressure fuel is pressurized to 22.1MPa-30MPa by the fuel booster pump, the compressed air is compressed to 22.1MPa-30MP by the low-pressure compressor and the high-pressure compressor, the resistance wire in the reactor is powered by the ground generator, and the fuel uses organic wastewater such as thick oil production water as material, thereby reducing the cost of using diesel oil.

[0054] S4: The water and fuel injected through the wellhead are continuously converted into supercritical multi-component thermal fluid composed of water vapor, carbon dioxide and hydrogen, and then injected into the oil layer through the screen pipe through the gas outlet.

[0055] Specifically, the gasification product will be inputted into the oil layer from the screen pipe together with the high-temperature compressed air in the continuous pipeline to perform the exothermic reaction, release heat, and form supercritical multi-component thermal fluid containing water vapor, carbon dioxide gas, and nitrogen gas, and the high-pressure water is preferentially injected to be heated. When the water is heated to 374°C in the supercritical reactor to enter the supercritical state, the high-pressure fuel can be injected, and the high-pressure fuel absorbs heat in the supercritical water to perform the gasification reaction in the supercritical reactor.

[0056] S5: The thickened oil is produced after being reduced in viscosity by the supercritical multi-component thermal fluid.

[0057] Specifically, the compressed air is preheated, and the gasification reaction product is supercritical water, hydrogen, and carbon dioxide. The hydrogen is mixed with the oxygen in the compressed air to burn to 374°C to 700°C, forming supercritical multi-component thermal fluid mixed with supercritical high-pressure water, carbon dioxide gas, and residual nitrogen and air, while releasing a large amount of heat. The exothermic reaction is performed in the oil layer, so that all the heat generated is used to heat and dilute the thickened oil, and the heat loss is close to 0. The generated multi-component thermal fluid can also improve the recovery efficiency of the thickened oil.

[0058] Example 2

[0059] Reference Figures 1-3 The difference between this example and the first example is that, in addition to the supercritical reactor, the water pressurization system, the fuel pressurization system, the compressed oxygen-containing gas source, and the power source are also provided in this example. The water pressurization system includes a primary water pressurization pump and a secondary pressurization pump, also known as a high-pressure water pump. The fuel pressurization pump includes a primary fuel pressurization pump and a high-pressure fuel pump. The compressed oxygen-containing gas source (air) includes a gas low-pressure compressor and a high-pressure compressor. The power source is a generator. It is not difficult to understand that the two-stage pressurization of water, fuel, and air is a conventional means in the field, and the supercritical reactor mainly includes an ejector, a stirrer, a heater, a gas outlet, and a layer of heat-insulating water film.

[0060] The steps are implemented in sequence as follows:

[0061] (1) The continuous pipeline is lowered into the horizontal well from the gas injection inlet. The continuous pipeline is first connected to the water tank and the fuel tank on the ground through the pump, and then connected to the preheater and the supercritical reactor in sequence in the well. The other two continuous pipelines are connected to the gas source through the compressor, and each continuous pipeline is also connected to the generator on the ground to send the compressed gas into the well from the wellhead, and then connected to the preheater and the gas outlet in sequence in the well.

[0062] (2) Use continuous pipeline for high pressure fuel, high pressure water and power delivery to the well, in addition to two continuous pipeline will deliver compressed air and power to the well, first open the water pump delivery high pressure water, supercritical reactor in the heater will be heated to supercritical state of water, open high pressure fuel pump, start delivery of fuel, at this time the fuel will be in the supercritical state of water gasification reaction, generating carbon dioxide, water and hydrogen, the continuous input of fuel so that the supercritical state continues to exist.

[0063] (3) From the wellhead injection of water and fuel constantly converted into supercritical multi-component thermal fluid composed of water vapor, carbon dioxide and hydrogen, these gases and from the wellhead 8 injection of high temperature and high pressure air through the gas outlet, respectively, and then through the screen pipe injection into the oil layer, and use packer to prevent gas backflow.

[0064] (4) Supercritical multi-component thermal fluid will reduce the viscosity of heavy oil after production.

[0065] Using the method of designing supercritical multi-component thermal fluid generating device, carried out supercritical multi-component thermal fluid heavy oil displacement experiment, experimental data as shown in table 1 (PV number: volume of injection medium at room temperature and core pore volume ratio) :

[0066] PV number / oil displacement efficiency Supercritical polygenic thermal fluid Polygenic thermal fluid Supercritical water 0.00 0％ 0％ 0％ 0.14 10％ 9％ 6％ 0.21 21％ 19％ 9％ 0.29 32％ 29％ 11％ 0.35 36％ 34％ 13％ 0.44 41％ 39％ 15％ 0.59 48％ 45％ 20％ 0.75 55％ 50％ 24％ 0.91 61％ 55％ 29％ 1.11 69％ 61％ 35％ 1.31 75％ 66％ 42％ 1.44 80％ 70％ 47％ 1.56 84％ 72％ 53％ 1.76 89％ 75％ 61％ 1.92 93％ 76％ 68％ 2.10 94％ 77％ 76％ 2.27 95％ 77％ 85％

[0067] Table 1 supercritical multi-component thermal fluid and PV number / oil displacement efficiency relationship comparison

[0068] From the above table, supercritical water flooding, multi-component thermal fluid flooding and supercritical multi-component thermal fluid flooding oil displacement efficiency increases with the increase of injection PV number, and among them, supercritical multi-component thermal fluid has the characteristics of gas flooding, thermal drive and miscible flooding, can effectively improve the recovery efficiency, oil production rate, shorten the displacement time, supercritical multi-component thermal fluid recovery rate reaches 95%, from supercritical water flooding and multi-component thermal fluid flooding to supercritical multi-component thermal fluid, not only improve the recovery efficiency, but also improve the thermal efficiency.

[0069] The rest is the same as example 1.

[0070] Example 3

[0071] Reference Figures 4-14The embodiment is different from the above embodiments in that: a device for thick oil viscosity reduction and injection by using supercritical water oxidation exothermic, comprising the pipeline connecting device (C) in any one of the above embodiments, comprising a pipeline main body 100, a sleeve 101, a bottom pipe 102 arranged on one side of the sleeve 101, and a connecting pipe 103 arranged on the side of the sleeve 101 away from the bottom pipe 102; and a connecting assembly 200 arranged at both ends of the sleeve 101, comprising a second connecting component 201 arranged on the side of the sleeve 101 close to the bottom pipe 102, a first connecting component 202 arranged on the side of the sleeve 101 close to the connecting pipe 103, an anti-disengagement component 203 arranged on the side of the first connecting component 202 away from the bottom pipe 102, a stabilizing component 204 arranged on the side of the second connecting component 201 close to the connecting pipe 103, and an unlocking component 205 arranged in the sleeve 101.

[0072] Specifically, a through hole 101a is formed in the center of the sleeve 101, a first connecting groove 101b is formed at one end of the sleeve 101 close to the connecting pipe 103, the first connecting groove 101b communicates with the through hole 101a, a sealing ring is arranged in the first connecting groove 101b, a clasp groove 101c is formed outside the first connecting groove 101b in the sleeve 101, a second connecting groove 101d is formed at one end of the sleeve 101 close to the bottom pipe 102, a rotating groove is arranged on the side of the second connecting groove 101d close to the through hole 101a, the rotating groove communicates with the stabilizing groove 204a, a second boss 102a is arranged on the side of the bottom pipe 102 close to the sleeve 101, the second boss 102a is in rotating fit with the second connecting groove 101d, a second chamfer 102b is arranged on the outside of one end of the second boss 102a close to the sleeve 101, a plurality of rotating clamping grooves 102c are arranged on one side of the second boss 102a, and the plurality of rotating clamping grooves 102c correspond to the rotating groove.

[0073] Specifically, the connecting pipe 103 is provided with a first boss on the side close to the sleeve pipe 101, the first boss is matched with the first connecting groove 101b, the first boss is provided with a first chamfer on the outer side of the end close to the sleeve pipe 101, the side of the first chamfer is provided with a clamping ring groove 101c, the first boss is provided with a sealing groove on the end close to the sleeve pipe 101, the sealing groove is matched with the sealing ring, when the first boss is completely inserted into the first connecting groove 101b, the sealing groove is in close contact with the sealing ring, so that the sealing property of the connecting pipe 103 and the sleeve pipe 101 is increased, the first connecting component 202 comprises a first connecting column 202a provided in the first connecting groove 101b, a first rotating pin 202b rotatably connected to the first connecting column 202a, a first spring 202c provided on the side of the first rotating pin 202b close to the through hole 101a, and a fixing unit 206 provided on the side of the first rotating pin 202b away from the anti-disengagement component 203, wherein the side of the first rotating pin 202b close to the through hole 101a is provided with a retreat groove 202d, the retreat groove 202d is provided with a second spring 202e, one side of the second spring 202e is provided with a retreat corner 202f, the retreat corner 202f is slidably connected in the retreat groove 202d, the side of the retreat corner 202f close to the fixing unit 206 is provided with a retreat stop lever 202g, and the retreat corner 202f is matched with the first chamfer.

[0074] Specifically, the anti-disengagement component 203 comprises a second connecting column 203a provided on the side of the first rotating pin 202b away from the through hole 101a, a second rotating pin 203b rotatably connected to the second connecting column 203a, an anti-disengagement lever 203c provided on the side of the second connecting column 203a close to the connecting pipe 103, and a fourth spring 203d provided on the side of the anti-disengagement lever 203c, wherein the side of the anti-disengagement lever 203c close to the second connecting column 203a is provided with an anti-disengagement boss 203e, the side of the anti-disengagement lever 203c close to the through hole 101a is provided with an anti-disengagement clamping plate 203f, the anti-disengagement clamping plate 203f is matched with the first boss, the anti-disengagement boss 203e is matched with the side of the second rotating pin 203b close to the through hole 101a, and the side of the anti-disengagement boss 203e away from the second rotating pin 203b is provided with a fifth spring 203g.

[0075] Specifically, the second connecting component 201 comprises a plug 201a provided in the second connecting groove 101d and a sixth spring 201b provided on the side of the plug 201a away from the through hole 101a, the side of the plug 201a close to the through hole 101a is provided with a third chamfer matched with the second chamfer 102b, the third chamfer can make the bottom pipe 102 inserted into the first connecting groove 101b, the second chamfer 102b pushes the third chamfer to drive the plug 201a to slide away from the through hole 101a, when the second boss 102a is completely inserted into the second connecting groove 101d, the plug 201a is in close contact with the end of the second chamfer 102b away from the sleeve pipe 101 under the action of the sixth spring 201b and is locked.

[0076] Working principle: when using the device, the operator first inserts the bottom pipe 102 into the second connecting slot 101d, rotates the clamping column 204g and inserts it into the rotating clamping slot 102c. During the process of inserting the bottom pipe 102 into the second connecting slot 101d, the second chamfer 102b first contacts the third chamfer on the plug 201a, so that the third chamfer drives the plug 201a to extrude the sixth spring 201b. When the second boss 102a is completely inserted into the second connecting slot 101d, the sixth spring 201b resets to push the plug 201a away from the side of the sleeve 101 close to the second chamfer 102b, achieving axial fixation. Since the second connecting slot 101d is not in communication with the through hole 101a, the second boss 102a and the second connecting slot 101d close to the side wall of the through hole 101a can achieve a certain sealing effect. When installing the connecting pipe 103, the operator holds the bottom pipe 102, and then inserts the first boss of the connecting pipe 103 into the first connecting slot 101b. During the process of inserting the first boss into the first connecting slot 101b, the first chamfer extrudes the retreat angle 202f, so that the retreat angle 202f drives the first rotating pin 202b to rotate along the first rotating pin 202b. The other end of the first rotating pin 202b extrudes the first spring 202c. At this time, due to the action of the unlocking part 205, the first plug 201a will gradually separate from the cooperation with the bottom pipe 102. The operator only needs to hold the connection between the bottom pipe 102 and the sleeve 101 to prevent the sleeve 101 from loosening. Until the first boss is completely inserted into the first connecting slot 101b, at this time, under the action of the first spring 202c, the retreat angle 202f resets and abuts against the side of the first chamfer away from the sleeve 101. The second connecting part 201 is the same. When the connecting pipe 103 and the sleeve 101 are connected during use, the connecting pipe 103 has a tendency to fall off the sleeve 101. The first chamfer extrudes the bottom of the retreat angle 202f away from the sleeve 101. The retreat angle 202f drives the first rotating pin 202b to extrude the second rotating pin 203b away from the side of the anti-falling rod 203c. The second rotating pin 203b changes the direction of the force under the action of the second connecting column 203a, so that the end of the second rotating pin 203b close to the anti-falling rod 203c extrudes the anti-falling platform 203e. The anti-falling platform 203e drives the anti-falling rod 203c and the anti-falling clamp plate 203f to clamp the first boss, realizing the function that the greater the force the connecting pipe 103 receives away from the sleeve 101, the tighter the first boss is clamped. The device is simple to operate and convenient to connect, which can effectively prevent the connection from falling off and increase the safety of the device in use.

[0077] The bottom pipe 102 is arranged on one side of the sleeve 101, the stabilizing part 204 is arranged on the side of the second connecting part 201 close to the connecting pipe 103, and the unlocking part 205 is arranged in the sleeve 101,

[0078] Specifically, the fixing unit 206 includes a fixing rod 206a arranged on the side of the retreat stop lever 202g away from the first rotating pin 202b, a fixing clasp 206b arranged on the side of the fixing rod 206a close to the through hole 101a, a retreat lever 206c arranged on the side of the fixing rod 206a close to the retreat stop lever 202g, and a third spring 206d arranged on the side of the retreat lever 206c away from the through hole 101a. The fixing clasp 206b is matched with the clasp groove 101c, the fixing clasp 206b is provided with a clasp strip, the clasp groove 101c is provided with a clasp groove, when the fixing clasp 206b is attached to the clasp groove 101c, the clasp strip is clamped into the clasp groove 101c, so that the connecting pipe 103 can drive the sleeve 101 to rotate when rotating, the retreat lever 206c is abutted to the side of the retreat stop lever 202g close to the through hole 101a, one end of the third spring 206d is connected with the retreat lever 206c, and the other end is abutted to the side of the first connecting groove 101b away from the through hole 101a.

[0079] Specifically, the stabilizing component 204 comprises a stabilizing groove 204a formed on the side of the second connecting groove 101d away from the bottom pipe 102, a stabilizing swivel 204b arranged in the stabilizing groove 204a, a ratchet wheel 204c arranged on the side of the stabilizing swivel 204b close to the second connecting groove 101d, a pawl 204d arranged on the side of the ratchet wheel 204c, a plurality of expansion grooves 204e formed on the side of the stabilizing swivel 204b away from the second connecting groove 101d, and a plurality of stabilizing supports 204f arranged on the side of the stabilizing swivel 204b away from the second connecting groove 101d. The ratchet wheel 204c is coaxially fixedly connected with the stabilizing swivel 204b, and a plurality of rotating clamping columns 204g are arranged on the side of the ratchet wheel 204c close to the sleeve 101. The plurality of rotating clamping columns 204g are arranged in the rotating groove in a ring shape. The pawl 204d cooperates with the ratchet wheel 204c. A third connecting column is arranged on the side of the stabilizing groove 204a close to the second connecting groove 101d. The pawl 204d is rotatably connected to the third connecting column. The pawl 204d can slide on the third connecting column. A seventh spring 204h is arranged on the side of the pawl 204d away from the ratchet wheel 204c. A pawl 204d compression spring (not shown in the figure) is arranged on the side of the pawl 204d away from the ratchet wheel 204c. The pawl 204d compression spring can make the pawl 204d always adhere to the ratchet wheel 204c. The pawl 204d can lock the ratchet wheel 204c when the ratchet wheel 204c rotates in one direction, and can freely rotate when the ratchet wheel 204c rotates in the other direction. The stabilizing support 204f is axially slidably connected to the side wall of the sleeve 101. The stabilizing support 204f is arranged on the outside of the sleeve 101.

[0080] Working principle: after the bottom pipe 102 is connected with the sleeve pipe 101, the rotating clamping column 204g on the ratchet wheel 204c is inserted into the rotating clamping slot 102c on the bottom pipe 102, in the process of installing the connecting pipe, the first chamfer extrudes the fixed clamping ring 206b, so that the fixed clamping ring 206b drives the fixed rod 206a to slide away from the through hole 101a, the retreat lever 206c on the fixed rod 206a extrudes the third spring 206d, when the first boss is completely inserted into the first connecting slot 101b, the fixed clamping ring 206b is horizontal with the fixed clamping slot, under the action of the third spring 206d, the fixed rod 206a drives the fixed clamping ring 206b to reset, so that the fixed clamping ring 206b is attached to the fixed clamping slot, if the clamping strip and the clamping slot are not attached, only need to slightly rotate the connecting pipe 103 to make the clamping strip clamped into the clamping slot, after the connecting pipe 103 is connected with the sleeve pipe 101, the operator puts the device into the pipeline placement, then rotates the connecting pipe 103, so that the connecting pipe 103 drives the sleeve pipe 101 to rotate, the sleeve pipe 101 and the bottom pipe 102 rotate first, when the side wall between the rotating clamping column 204g and the rotating clamping slot 102c is attached, the rotating clamping column 204g drives the ratchet wheel 204c and the stable rotating ring 204b to rotate, under the cooperation of the expansion slot 204e on the stable rotating ring 204b and the stable support 204i below the rotating clamping column 204g, the rotating clamping column 204g extends out of the sleeve pipe 101, until the stable support 204j is in abutment with the inner wall of the outer drill hole, in the process of rotating the ratchet wheel 204c, the pawl 204d is always attached to the ratchet wheel 204c, when the ratchet wheel 204c stops, the pawl 204d is locked with the ratchet wheel 204c, so that the ratchet wheel 204c cannot rotate reversely, so that the pipeline is fixed when the continuous pipeline transports the reaction fuel.

[0081] The unlocking component 205 is arranged in the sleeve 101, the unlocking component 205 comprises a first unlocking column 205a arranged at two sides of the fixed rod 206a and away from one end of the through hole 101a, a second unlocking column 205b arranged at two sides of the bolt 201a and away from one end of the through hole 101a, an unlocking blocking disc 205c arranged at one side of the ratchet wheel 204c and away from the pawl 204d, and an unlocking push rod 205d arranged on the inner wall of the sleeve 101 and slidingly connected to the inner wall of the sleeve 101, and the stabilizing component 204 comprises a stabilizing groove 204a opened at one side of the second connecting groove 101d and away from the bottom pipe 102, a stabilizing rotating ring 204b arranged in the stabilizing groove 204a, a ratchet wheel 204c arranged at one side of the stabilizing rotating ring 204b and close to the second connecting groove 101d, a pawl 204d arranged at one side of the ratchet wheel 204c, a plurality of expansion grooves 204e opened at one end of the stabilizing rotating ring 204b and away from the second connecting groove 101d, and a plurality of stabilizing supports 204f arranged at one side of the stabilizing rotating ring 204b and away from the second connecting groove 101d, and a torsional spring (not shown in the figure) can be arranged at one side of the stabilizing rotating ring 204b and the stabilizing groove 204a and close to the through hole 101a, so that when the unlocking component 205 unlocks the ratchet wheel 204c, the torsional spring can automatically drive the stabilizing rotating ring 204b to rotate in reverse, so that the stabilizing support 204j is retracted.

[0082] Specifically, the unlocking push rod 205d is provided with a first unlocking groove 205e at one end close to the first connecting groove 101b, the first unlocking groove 205e is arranged at a corresponding position of the fixed rod 206a, the height of the first unlocking groove 205e is greater than the height of the fixed rod 206a, the fixed rod 206a can pass through the first unlocking groove 205e when moving away from the through hole 101a, first key grooves slidingly matched with the first unlocking column 205a are arranged at two sides of the first unlocking groove 205e, the first key grooves are arranged obliquely at two sides of the first unlocking groove 205e, when the first key grooves move towards one side close to the bottom pipe 102, the first key grooves can drive the first unlocking column 205a to move away from the through hole 101a, thereby driving the fixed rod 206a to move outward, the unlocking push rod 205d is provided with a second unlocking groove 205f at one side close to the second connecting groove 101d, the second unlocking groove 205f is arranged at a corresponding position of the bolt 201a, the height of the second unlocking groove 205f is greater than the height of the bolt 201a, second key grooves slidingly matched with the second unlocking column 205b are arranged at two sides of the second unlocking groove 205f, the second key grooves are arranged obliquely at two sides of the second unlocking groove 205f, when the second key grooves move towards one side close to the bottom pipe 102, the second key grooves can drive the second unlocking column 205b to move away from the through hole 101a, thereby driving the bolt 201a to move outward, the unlocking push rod 205d is provided with an unlocking push handle 205g at one end away from the through hole 101a, the unlocking push rod 205d is provided with an unlocking baffle 205h at the middle part, the unlocking baffle 205h abuts against one side of the unlocking baffle 205h and close to the ratchet wheel 204c, and the unlocking push handle 205g is arranged outside the sleeve 101.

[0083] Working principle: when the device needs to be connected and the connecting pipe 103 and the bottom pipe 102 need to be disassembled, the operator only needs to push the unlocking handle 205g, so that the unlocking handle 205g drives the unlocking push rod 205d to move to the side of the sleeve 101, the unlocking push rod 205d drives the first unlocking groove 205e, the second unlocking groove 205f and the unlocking baffle 205h to move to the side close to the bottom pipe 102, in the movement process of the first unlocking groove 205e, the first key groove can drive the first unlocking column 205a to move away from the through hole 101a, so as to drive the fixed rod 206a to move outward, at this time, the retreat lever 206c on the fixed rod 206a extrudes the third spring 206d, at the same time, the retreat lever 206c extrudes the retreat stop lever 202g, so that the retreat stop lever 202g drives the retreat angle 202f to extrude the second spring 202e, so that the retreat angle 202f is retracted into the retreat groove 202d, and the unlocking between the first chamfer and the retreat angle 202f, the fixed ring 206b and the ring groove 101c is completed, at the same time, in the movement process of the second unlocking groove 205f, the second unlocking column 205b can be driven to move away from the through hole 101a, the second unlocking column 205b drives the bolt 201a to extrude the sixth spring 201b and makes the bolt 201a and the second chamfer 102b disengage, so as to complete the unlocking between the bolt 201a and the second chamfer 102b, at the same time, in the movement process of the unlocking baffle 205h, the unlocking baffle 205h drives the unlocking baffle 205c to move to the side close to the bottom pipe 102, the unlocking baffle 205c drives the pawl 204d to extrude the seventh spring 204h, and the pawl 204d disengages from the cooperation with the ratchet wheel 204c, so as to complete the unlocking between the pawl 204d and the ratchet wheel 204c, the device is simple to operate, can realize one-key unlocking device, and is convenient to disassemble and assemble.

[0084] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review the present disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Thus, the foregoing description is by way of example only, and is not intended to be limiting. The application is limited only as defined in the following claims and equivalents thereto. The sequence of any process or method steps, or the order in which they are carried out, can be altered or re-ordered without departing from the scope of the application. Any "articles of manufacture" or "manufacturing" as described herein are intended to encompass structures constructed of a multitude of different physical elements or components. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and also cover structures yet to be invented which perform the recited function but operate in a different manner. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the application as expressed in the appended claims.

[0085] Also, to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (that is, not all implementations can include all of the features described or optional implementations can include only a subset of the features described).

[0086] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts can inevitably lead to modifications, not all of which can be foreseen in advance. Such modifications are not to be regarded as a departure from the spirit and scope of the present application, and all such modifications are intended to be included within the scope of the present application. The disclosure is not a complete description of the actual implementation, nor is it intended to be so; thus, what is actually devised can depart from what is described in this disclosure.

[0087] It should be noted that the above examples are merely used to illustrate the technical solutions of the present application, but not limit the present application, and although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all such modifications or replacements should be included in the scope of the claims of the present application.

Claims

1. A method for reducing the viscosity of thick oil by using supercritical water oxidation exothermic injection, characterized in that: the method uses a pipeline connecting device (C), which comprises a sleeve (101), a bottom pipe (102) arranged on one side of the sleeve (101), and a connecting pipe (103) arranged on the side of the sleeve (101) away from the bottom pipe (102); and a connecting assembly (200) is arranged at both ends of the sleeve (101); the connecting assembly (200) comprises a second connecting component (201) arranged on the side of the sleeve (101) close to the bottom pipe (102), a first connecting component (202) arranged on the side of the sleeve (101) close to the connecting pipe (103), an anti-disengagement component (203) arranged on the side of the first connecting component (202) away from the bottom pipe (102), a stabilizing component (204) arranged on the side of the second connecting component (201) close to the connecting pipe (103), and an unlocking component (205) arranged in the sleeve (101); a through hole (101a) is formed in the center of the sleeve (101), a first connecting groove (101b) is formed at one end of the sleeve (101) close to the connecting pipe (103), and a second connecting groove (101d) is formed at one end of the sleeve (101) close to the bottom pipe (102); the first connecting component (202) comprises a first connecting column (202a) arranged in the first connecting groove (101b) and a first rotating pin (202b) rotatably connected to the first connecting column (202a), and the second connecting component (201) comprises a plug (201a) arranged in the second connecting groove (101d); the anti-disengagement component (203) comprises a second connecting column (203a) arranged on the side of the first rotating pin (202b) away from the through hole (101a), a second rotating pin (203b) rotatably connected to the second connecting column (203a), an anti-disengagement rod (203c) arranged on the side of the second connecting column (203a) close to the connecting pipe (103), a fourth spring (203d) arranged on the side of the anti-disengagement rod (203c), wherein the anti-disengagement rod (203c) is provided with an anti-disengagement abutment (203e) on the side close to the second connecting column (203a), the anti-disengagement rod (203c) is provided with an anti-disengagement clamping plate (203f) on the side close to the through hole (101a), the anti-disengagement clamping plate (203f) is matched with the first protrusion, the anti-disengagement abutment (203e) is matched with the side of the second rotating pin (203b) close to the through hole (101a), the anti-disengagement abutment (203e) is provided with a fifth spring (203g) on the side away from the second rotating pin (203b), and a fixing unit (206) is arranged on the side of the first rotating pin (202b) away from the anti-disengagement component (203). ​ ​ The stabilizing component (204) comprises a stabilizing groove (204a) opened on the side of the second connecting groove (101d) away from the bottom pipe (102), a stabilizing swivel (204b) arranged in the stabilizing groove (204a), a ratchet wheel (204c) arranged on the side of the stabilizing swivel (204b) close to the second connecting groove (101d), a ratchet pawl (204d) arranged on the side of the ratchet wheel (204c), a plurality of expansion grooves (204e) opened on the side of the stabilizing swivel (204b) away from the second connecting groove (101d), and a plurality of stabilizing supports (204f) arranged on the side of the stabilizing swivel (204b) away from the second connecting groove (101d); The first rotating pin (202b) is provided with a retreat groove (202d) on the side close to the through hole (101a), the retreat groove (202d) is provided with a second spring (202e), the second spring (202e) is provided with a retreat angle (202f) on one side, the retreat angle (202f) is slidingly connected in the retreat groove (202d), and the retreat angle (202f) is provided with a retreat stop lever (202g) on the side close to the fixed unit (206); The fixed unit (206) comprises a fixed rod (206a) arranged on the side of the retreat stop lever (202g) away from the first rotating pin (202b), a fixed clasp (206b) arranged on the side of the fixed rod (206a) close to the through hole (101a), a retreat lever (206c) arranged on the side of the fixed rod (206a) close to the retreat stop lever (202g), and a third spring (206d) arranged on the side of the retreat lever (206c) away from the through hole (101a), the fixed clasp (206b) is matched with the clasp groove (101c), the fixed clasp (206b) is provided with a clasp strip, and the clasp groove (101c) is provided with a clasp groove; The unlocking component (205) arranged in the sleeve (101) comprises a first unlocking column (205a) arranged on the side of the fixed rod (206a) away from the through hole (101a), a second unlocking column (205b) arranged on the side of the bolt (201a) away from the through hole (101a), an unlocking stop disc (205c) arranged on the side of the ratchet pawl (204d) away from the ratchet wheel (204c), and an unlocking push rod (205d) arranged on the inner wall of the sleeve (101), wherein the unlocking push rod (205d) is slidingly connected to the inner wall of the sleeve (101); The method specifically comprises: Materials are provided by a water tank, a fuel tank and a compressor, and are lowered into a horizontal well through a continuous pipeline from a gas injection inlet; A downhole preheater and a supercritical reactor are connected through the continuous pipeline; The continuous pipeline is connected through a pipeline connection device (C); High-pressure water is delivered by a water pump, the water is heated to a supercritical state by a heater in the supercritical reactor, fuel is delivered by a high-pressure fuel pump to generate supercritical carbon dioxide, supercritical water and hydrogen; The water and fuel injected through the wellhead are continuously converted into supercritical multi-component thermal fluid composed of water vapor, carbon dioxide and hydrogen, which is injected into the oil layer through the gas outlet and the screen pipe; The supercritical multi-component thermal fluid is used to reduce the viscosity of the heavy oil and then to extract the heavy oil.

2. The method for reducing the viscosity of heavy oil by using the supercritical water oxidation exothermic injection as claimed in claim 1, characterized in that: The high-pressure water is generated by pressurizing the normal-temperature low-pressure water to 22.1-30 MPa by a high-pressure water pump, the high-pressure fuel is obtained by pressurizing the fuel to 22.1-30 MPa by a fuel pressurizing pump, the compressed air is obtained by compressing the air to 22.1-30 MPa by a low-pressure compressor and a high-pressure compressor, and the resistance wire in the reactor is powered by a ground generator.

3. The method for reducing the viscosity of heavy oil by using the supercritical water oxidation exothermic heat according to claim 1, characterized in that: There are fuel and water conveying passages in one continuous pipe, and two continuous pipes convey compressed air, and there are separate power passages in each continuous pipe, and the mineral insulation is used to ensure that the power and other passages do not affect each other, and the multiple passages are combined in the continuous pipe, which is also more conducive to the arrangement of the pipe in the well and can save operation cost.

4. The method for reducing the viscosity of heavy oil by using the supercritical water oxidation exothermic heat according to claim 1, characterized in that: The fuel uses the organic wastewater such as water produced from heavy oil production as material, thereby reducing the cost of using diesel.

5. The method for reducing the viscosity of heavy oil by using the supercritical water oxidation exothermic heat according to claim 1, characterized in that: The packer is added between different continuous pipes to prevent mutual influence between different pipes, and nitrogen is filled in the straight well part to reduce heat loss.

6. The method for reducing the viscosity of heavy oil by using the supercritical water oxidation exothermic heat according to claim 1, characterized in that: The high-pressure water is preferentially injected for heating, and the high-pressure fuel is injected only after the water is heated to 374℃ in the supercritical reactor to enter the supercritical state.

7. The method for reducing the viscosity of heavy oil by using the supercritical water oxidation exothermic heat according to claim 6, characterized in that: The compressed air is preheated, the product of the gasification reaction is supercritical water, hydrogen and carbon dioxide, the hydrogen is sufficiently mixed with oxygen in the compressed air for combustion to 374-700℃, a supercritical multi-component thermal fluid mixed with supercritical high-pressure water, carbon dioxide gas, residual nitrogen and air is formed, and a large amount of heat is released, the exothermic reaction is carried out in the oil layer, so that the generated heat is all used for heating and diluting the heavy oil, the heat loss is close to 0, and the generated multi-component thermal fluid can also improve the recovery efficiency of the heavy oil.

8. The method for reducing the viscosity of heavy oil by using the supercritical water oxidation exothermic heat according to claim 1, characterized in that: Part of the heat generated by the exothermic reaction can supplement the heat required by the gasification reaction, so that the power of the heater can be reduced in the later period to avoid waste of energy, and the heated and diluted heavy oil is extracted after the well is closed for 3-15 days and the pressure between the casing and the tubing is stabilized.

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