Supercritical fracturing device

Abstract

The utility model discloses a supercritical fracturing device which comprises a carbon dioxide storage tank, a pressurization system, a phase change pipe and a heat exchange system, and the carbon dioxide storage tank is used for storing liquid carbon dioxide; an inlet of the pressurizing system is communicated with an outlet of the carbon dioxide storage tank, and the pressurizing system is used for pressurizing liquid carbon dioxide; an inlet of the phase change pipe is communicated with an outlet of the pressurization system, and an outlet of the phase change pipe is communicated with an output pipe; the heat exchange system is arranged on the outer side of the phase change pipe and used for heating carbon dioxide in the phase change pipe; pressurized carbon dioxide in the phase change pipe is heated by the heat exchange system to be in a supercritical state, the output pipe is used for conveying the carbon dioxide in the supercritical state to a working area, liquid carbon dioxide is stored in the carbon dioxide storage tank, and the pressurization system pressurizes the liquid carbon dioxide conveyed out of the carbon dioxide storage tank. The heat exchange system is arranged on the outer side of the phase change pipe and used for heating carbon dioxide.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon dioxide processing field, especially in a kind of supercritical fracturing device. BACKGROUND

[0002] Carbon dioxide flooding has become the conventional flooding means used in present stage oil recovery, which can effectively increase oil recovery ratio.

[0003] Conventional carbon dioxide flooding is generally applicable to conventional reservoir, for low-permeability reservoir, dense reservoir, conventional carbon dioxide flooding cannot effectively improve its oil recovery ratio. CONTENT OF UTILITY MODEL

[0004] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, the utility model provides a kind of supercritical fracturing device, liquid carbon dioxide can be fractured into supercritical state.

[0005] According to the supercritical fracturing device of the utility model embodiment, it includes: carbon dioxide storage tank, pressurizing system, phase change pipe, heat exchange system, the carbon dioxide storage tank is used to store liquid carbon dioxide;The import of the pressurizing system is communicated with the export of the carbon dioxide storage tank, and the pressurizing system is used to pressurize liquid carbon dioxide;The import of the phase change pipe is communicated with the export of the pressurizing system, and the export of the phase change pipe is communicated with output pipe;The heat exchange system is arranged on the outside of the phase change pipe, and the heat exchange system is used to heat carbon dioxide in the phase change pipe;The pressurized carbon dioxide in the phase change pipe becomes supercritical state after being heated by the heat exchange system, and the output pipe is used to transport carbon dioxide in supercritical state to working area.

[0006] At least has following beneficial effect: liquid carbon dioxide is stored in the carbon dioxide storage tank, the pressurizing system pressurizes liquid carbon dioxide transferred from the carbon dioxide storage tank, the heat exchange system is arranged on the outside of the phase change pipe, the heat exchange system is used to heat carbon dioxide, carbon dioxide is heated when passing through the heating pipeline, so that carbon dioxide is converted from liquid state to gaseous state, the pressurizing system and the heat exchange system apply pressure and temperature to carbon dioxide, so that carbon dioxide reaches supercritical state, which is convenient for later work.

[0007] According to some embodiments of the utility model, the phase change pipe is provided with several, several phase change pipes are connected in parallel between the output pipe and the pressurizing system, and the arrangement of several phase change pipes can improve the efficiency of transporting carbon dioxide, and since several phase change pipes are connected in parallel with each other, they are relatively independent and do not interfere with each other, and the loss of any phase change pipe does not affect the normal work of other phase change pipes, which is also convenient for maintenance.

[0008] According to some embodiments of the present application, the carbon dioxide storage tanks are provided in plurality, the plurality of carbon dioxide storage tanks are connected in parallel to the first collecting pipe, the first collecting pipe is connected to the inlet of the pressurization system, and the plurality of carbon dioxide storage tanks are provided to improve the efficiency of output liquid carbon dioxide, and because the plurality of related pipes are connected in parallel to each other, the plurality of carbon dioxide storage tanks are relatively independent and do not interfere with each other, and any damage to the carbon dioxide storage tank does not affect the normal operation of the other carbon dioxide storage tanks, and facilitates maintenance.

[0009] According to some embodiments of the present application, the pressurization system comprises a first booster pump and a fracturing truck, the inlet of the first booster pump is connected to the first collecting pipe, the outlet of the first booster pump is connected to the inlet of the fracturing truck, the outlet of the fracturing truck is connected to the inlet of the phase change pipe, the booster pump is used to provide a driving force for carbon dioxide, and the pressurization system is used to pressurize carbon dioxide and provide a pressure for carbon dioxide to reach a supercritical state.

[0010] According to some embodiments of the present application, the fracturing trucks are provided in plurality, the plurality of fracturing trucks are connected in parallel between the second collecting pipe and the first booster pump, the second collecting pipe is connected to the inlet of the phase change pipe, and the plurality of fracturing trucks are provided to improve the fracturing efficiency of carbon dioxide, and because the plurality of fracturing trucks are connected in parallel to each other, the plurality of fracturing trucks are relatively independent and do not interfere with each other, and any damage to the fracturing truck does not affect the normal operation of the other fracturing trucks, and facilitates maintenance.

[0011] According to some embodiments of the present application, the heat exchange system comprises a heat exchanger, a heat conduction furnace and a second booster pump, the heat exchanger is sleeved on the outside of the phase change pipe, the outlet of the heat exchanger is connected to the inlet of the heat conduction furnace, the outlet of the heat conduction furnace is connected to the inlet of the second booster pump, the outlet of the second booster pump is connected to the inlet of the heat exchanger, and the heat exchanger, the heat conduction furnace and the second booster pump form a circulating pipeline containing a heat exchange medium, the heat conduction furnace is used to heat the heat exchange medium in the circulating pipeline, the second booster pump is used to drive the heat exchange medium in the circulating pipeline to flow, the heat exchanger is used to heat the carbon dioxide in the phase change pipe, and the cooperation of the heat conduction furnace, the heat exchanger and the second booster pump enables the heat exchanger to continuously heat the carbon dioxide in the phase change pipe.

[0012] According to some embodiments of the present application, the heat exchange system further comprises a buffer tank, the inlet of the buffer tank is communicated with the outlet of the heat conduction furnace, the outlet of the buffer tank is communicated with the inlet of the heat exchanger, the buffer tank plays a role of stabilizing pressure, balancing flow and reducing impact on the heat exchange medium circulating in the whole heat exchange system, and the stability and heat exchange efficiency of the heat exchange system can be improved.

[0013] According to some embodiments of the present application, the heat exchanger is provided in plurality, the heat exchanger is provided in one-to-one correspondence with the phase change pipe, the plurality of heat exchangers are provided in parallel between the third collecting pipe and the second booster pump, the third collecting pipe is communicated with the inlet of the heat conduction furnace, the phase change pipe is provided in plurality, the number of the heat exchanger is same as that of the phase change pipe and is in one-to-one correspondence, the heat exchange efficiency is improved, and the maintenance of the heat exchanger is facilitated.

[0014] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in combination with the drawings and embodiments, in which:

[0016] Figure 1 It is a structure schematic view of a supercritical fracturing device according to an embodiment of the present application;

[0017] Reference numerals: carbon dioxide storage tank 100, first collecting pipe 110;

[0018] Pressurizing system 200, first booster pump 210, fracturing vehicle 220, second collecting pipe 230;

[0019] Phase change pipe 300;

[0020] Heat exchange system 400, heat exchanger 410, heat conduction furnace 420, second booster pump 430, buffer tank 440, third collecting pipe 450;

[0021] Output pipe 500. DETAILED DESCRIPTION

[0022] In the description of the present application, it should be understood that, in relation to the position description, for example, the position or location relationship indicated by the upper, lower, front, rear, left, right and the like is based on the position or location relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and cannot be understood as a limitation on the present application that the indicated device or element must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application.

[0023] In the description of the utility model, if it is described to first, second, only for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0024] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the skilled person in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0025] Refer to Figure 1 The utility model discloses a supercritical fracturing device, include: carbon dioxide storage tank 100, pressurizing system 200, phase change pipe 300, heat exchange system 400, carbon dioxide storage tank 100 is used to store liquid carbon dioxide, the import of pressurizing system 200 is communicated with the export of carbon dioxide storage tank 100, and pressurizing system 200 is used to pressurize liquid carbon dioxide, and the import of phase change pipe 300 is communicated with the export of pressurizing system 200, and the export of phase change pipe 300 is communicated with output pipe 500, and heat exchange system 400 is set up in the outside of phase change pipe 300, and heat exchange system 400 is used to heat carbon dioxide in phase change pipe 300, and the carbon dioxide that is pressurized in phase change pipe 300 becomes supercritical state after heating through heat exchange system 400, and output pipe 500 is used to deliver carbon dioxide of supercritical state to work area.

[0026] Liquid carbon dioxide is stored in carbon dioxide storage tank 100, and pressurizing system 200 pressurizes liquid carbon dioxide transferred from carbon dioxide storage tank 100, heat exchange system 400 is set up on the outside of phase change pipe 300, heat exchange system 400 is used to heat carbon dioxide, carbon dioxide is heated when passing through heating pipeline, makes carbon dioxide change from liquid state to gaseous state, pressurizing system 200 and heat exchange system 400 exert pressure and temperature increase on carbon dioxide, so that carbon dioxide reaches supercritical state, which is convenient for later use.

[0027] In some embodiments, carbon dioxide reaches supercritical state after passing through phase change pipe 300, and supercritical carbon dioxide can effectively improve oil recovery ratio for oil displacement in low-permeability and tight oil reservoirs, and according to different oilfield geological conditions, about one to four point two tons of carbon dioxide are needed to increase one ton of crude oil, and about 10% of the total reserves of the oilfield can be increased, and supercritical carbon dioxide is more optimized in terms of single permeability of crude oil, interfacial tension and overcoming clay swelling.

[0028] In some embodiments, the phase change pipe 300 is provided with several phase change pipes 300 connected in parallel between the output pipe 500 and the pressurizing system 200. The provision of several phase change pipes 300 not only improves the transportation efficiency of carbon dioxide, but also makes the several phase change pipes 300 relatively independent of each other and not interfere with each other, wherein the loss of any phase change pipe 300 does not affect the normal work of other phase change pipes 300, and it is convenient for maintenance. The number of phase change pipes 300 can be changed according to the demand, so as to control the output rate of supercritical carbon dioxide.

[0029] It can be understood that the carbon dioxide storage tank 100 is provided with several carbon dioxide storage tanks 100 connected in parallel to the first collecting pipe 110, and the first collecting pipe 110 is connected to the inlet of the pressurizing system 200. The provision of several carbon dioxide storage tanks 100 not only improves the output efficiency of liquid carbon dioxide, but also makes the several carbon dioxide storage tanks 100 relatively independent of each other and not interfere with each other, wherein the damage of any carbon dioxide storage tank 100 does not affect the normal work of other carbon dioxide storage tanks 100, and it is convenient for maintenance. It can be understood that the several carbon dioxide storage tanks 100 are each provided with a valve, and the flow of carbon dioxide can be controlled by selecting the valve, so as to control the output rate of supercritical carbon dioxide.

[0030] It can be conceived that the pressurizing system 200 includes a first booster pump 210 and a fracturing truck 220, the inlet of the first booster pump 210 is connected to the first collecting pipe 110, the outlet of the first booster pump 210 is connected to the inlet of the fracturing truck 220, and the outlet of the fracturing truck 220 is connected to the inlet of the phase change pipe 300. The booster pump is used to provide a driving force for carbon dioxide, and the pressurizing system 200 is used to pressurize carbon dioxide to provide a pressure for carbon dioxide to reach a supercritical state. The booster pump and the fracturing truck 220 are both conventional techniques in the art, and will not be described in detail here.

[0031] It should be noted that the fracturing truck 220 is provided with several fracturing trucks 220 connected in parallel between the second collecting pipe 230 and the first booster pump 210, and the second collecting pipe 230 is connected to the inlet of the phase change pipe 300. The provision of several fracturing trucks 220 not only improves the fracturing efficiency of carbon dioxide, but also makes the several fracturing trucks 220 relatively independent of each other and not interfere with each other, wherein the damage of any fracturing truck 220 does not affect the normal work of other fracturing trucks 220, and it is convenient for maintenance. It can be understood that the number of fracturing trucks 220 can be increased or decreased according to actual demand, and resources are not wasted when meeting the actual work demand.

[0032] In some embodiments, the heat exchange system 400 comprises a heat exchanger 410, a heat conduction furnace 420 and a second booster pump 430, the heat exchanger 410 is sleeved on the outside of the phase change pipe 300, the outlet of the heat exchanger 410 is communicated with the inlet of the heat conduction furnace 420, the outlet of the heat conduction furnace 420 is communicated with the inlet of the second booster pump 430, the outlet of the second booster pump 430 is communicated with the inlet of the heat exchanger 410, the heat exchanger 410, the heat conduction furnace 420 and the second booster pump 430 form a circulating pipeline, and the circulating pipeline contains a heat exchange medium, the heat conduction furnace 420 is used for heating the heat exchange medium in the circulating pipeline, the second booster pump 430 is used for pressurizing the heat exchange medium in the circulating pipeline to drive the heat exchange medium in the circulating pipeline to flow, and the heat exchanger 410 is used for heating the carbon dioxide in the phase change pipe 300. The cooperation of the heat conduction furnace 420, the heat exchanger 410 and the second booster pump 430 enables the heat exchanger 410 to continuously heat the carbon dioxide in the phase change pipe 300. It can be understood that the heat exchanger 410 is internally provided with a winding pipe, and the winding pipe is wound on the phase change pipe 300, so as to facilitate the heat exchange between the heat exchange medium in the circulating pipeline and the carbon dioxide in the phase change pipe.

[0033] In some embodiments, the heat exchange system 400 further comprises a buffer tank 440, the inlet of the buffer tank 440 is communicated with the outlet of the heat conduction furnace 420, and the outlet of the buffer tank 440 is communicated with the inlet of the heat exchanger 410. The buffer tank 440 plays a role in stabilizing the pressure, balancing the flow and reducing the impact of the heat exchange medium circulating in the entire heat exchange system 400, and can improve the stability and heat exchange efficiency of the heat exchange system 400. It can be understood that the buffer pipe can also be provided as an accumulator, a pressure stabilizing tank or other devices with functions of stabilizing fluid pressure, balancing flow and the like.

[0034] In some embodiments, the heat exchanger 410 is provided in plurality, the heat exchanger 410 is arranged in one-to-one correspondence with the phase change pipe 300, the plurality of heat exchangers 410 are connected in parallel to the third collecting pipe 450, the third collecting pipe 450 is communicated with the inlet of the heat conduction furnace 420, the phase change pipe 300 is provided in plurality, the number of the heat exchangers 410 is the same as that of the phase change pipes 300, and the heat exchangers 410 correspond to the phase change pipes 300 in one-to-one correspondence. The number of the heat exchangers 410 is the same as that of the phase change pipes 300, and the heat exchangers 410 correspond to the phase change pipes 300 in one-to-one correspondence. The heat exchange efficiency is improved, and the maintenance of the heat exchanger 410 is facilitated.

[0035] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0036] Of course, the present application is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A supercritical fracturing device, characterized in that, include: Carbon dioxide storage tank (100) for storing liquid carbon dioxide; A pressurization system (200) is provided, the inlet of which is connected to the outlet of the carbon dioxide storage tank (100), the pressurization system (200) being used to pressurize liquid carbon dioxide; A phase change tube (300) is provided, the inlet of which is connected to the outlet of the pressurization system (200), and the outlet of the phase change tube (300) is connected to an output tube (500). A heat exchange system (400) is disposed outside the phase change tube (300), and the heat exchange system (400) is used to heat the carbon dioxide in the phase change tube (300); The pressurized carbon dioxide in the phase change tube (300) is heated by the heat exchange system (400) and becomes supercritical. The output tube (500) is used to transport the supercritical carbon dioxide to the working area.

2. The supercritical fracturing device according to claim 1, characterized in that, A plurality of phase change tubes (300) are provided, and the plurality of phase change tubes (300) are connected in parallel between the output tube (500) and the pressurization system (200).

3. The supercritical fracturing device according to claim 1, characterized in that, The carbon dioxide storage tanks (100) are provided in a plurality of units, and the plurality of carbon dioxide storage tanks (100) are connected in parallel to a first manifold (110), which is connected to the inlet of the pressurization system (200).

4. A supercritical fracturing device according to claim 3, characterized in that, The pressurization system (200) includes a first booster pump (210) and a fracturing truck (220). The inlet of the first booster pump (210) is connected to the first manifold (110), the outlet of the first booster pump (210) is connected to the inlet of the fracturing truck (220), and the outlet of the fracturing truck (220) is connected to the inlet of the phase change tube (300).

5. A supercritical fracturing device according to claim 4, characterized in that, Several fracturing trucks (220) are provided, and several fracturing trucks (220) are arranged in parallel between the second manifold (230) and the first booster pump (210). The second manifold (230) is connected to the inlet of the phase change tube (300).

6. A supercritical fracturing device according to claim 1, characterized in that, The heat exchange system (400) includes a heat exchanger (410), a heat transfer furnace (420), and a second booster pump (430). The heat exchanger (410) is sleeved on the outside of the phase change tube (300). The outlet of the heat exchanger (410) is connected to the inlet of the heat transfer furnace (420), and the outlet of the heat transfer furnace (420) is connected to the inlet of the second booster pump (430). The outlet of the second booster pump (430) is connected to the inlet of the heat exchanger (410). The circulating pipe formed by the heat exchanger (410), the heat transfer furnace (420), and the second booster pump (430) contains a heat exchange medium. The heat transfer furnace (420) is used to heat the heat exchange medium in the circulating pipe. The second booster pump (430) is used to drive the flow of the heat exchange medium in the circulating pipe. The heat exchanger (410) is used to heat the carbon dioxide in the phase change tube (300).

7. A supercritical fracturing device according to claim 6, characterized in that, The heat exchange system (400) also includes a buffer tank (440), the inlet of which is connected to the outlet of the heat transfer furnace (420), and the outlet of which is connected to the inlet of the heat exchanger (410).

8. A supercritical fracturing device according to claim 6, characterized in that, Several heat exchangers (410) are provided, and each heat exchanger (410) is provided in a one-to-one correspondence with the phase change tube (300). Each heat exchanger (410) is sleeved on the corresponding phase change tube (300). Several heat exchangers (410) are connected in parallel to a third manifold (450), and the third manifold (450) is connected to the inlet of the heat transfer furnace (420).

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