CN217422947U - Offshore supercritical CO 2 Injection sealing system - Google Patents
Offshore supercritical CO 2 Injection sealing system Download PDFInfo
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- CN217422947U CN217422947U CN202220084914.0U CN202220084914U CN217422947U CN 217422947 U CN217422947 U CN 217422947U CN 202220084914 U CN202220084914 U CN 202220084914U CN 217422947 U CN217422947 U CN 217422947U
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Abstract
The invention provides a supercritical CO on the sea 2 An injection sequestration system comprising two liquid CO disposed in an injection platform tank 2 Storage tanks, each storage tank being provided with liquid CO 2 A deep well pump; liquid CO 2 Transferring to liquid CO by deep well pump 2 After the main pipe, the water enters a steady flow buffer tank; liquid CO 2 After gas-liquid separation in a steady flow buffer tank, liquid CO is added 2 The pipeline enters a perfusion pump; the pressure is preliminarily increased by the filling pump and then enters the pressure pump, and the required injection pressure is reached after the pressure is increased; then passing through liquid CO 2 The pipeline enters a heater to be heated to reach a supercritical state; then passing through supercritical CO 2 Injection manifold, supercritical CO 2 Injection line, well to saltAn aqueous layer. CO of the invention 2 The supercritical process is designed to be pressurized and heated, the flow has the lowest energy consumption, and supercritical CO can be realized 2 Safe, continuous and efficient saline injection.
Description
Technical Field
The invention relates to the field of carbon dioxide sequestration, in particular to a marine supercritical CO 2 And injecting the sealing system.
Background
Carbon capture, utilization and sequestration (CCUS) is one of the key to achieving carbon neutralization goals, utilizing CO 2 The method has various modes, but really realizes permanent storage and zero carbon, and geological storage comprises CO in geology such as a brine layer, an oil-gas layer, a coal layer and the like 2 The sequestration is most efficient. In general, CO 2 Should be injected into the aquifer under supercritical state for sequestration according to CO 2 The physical properties of (A), the supercritical temperature and pressure were 31.1 ℃ and 7.38MPa, respectively. CO under supercritical conditions 2 Density is similar to that of liquid, but mobility is similar to that of gas,that is to say in the supercritical state, CO 2 Can be stored in large quantity, can be rapidly transferred and diffused to fill the whole reservoir space, so that CO can be obtained under the supercritical condition 2 Injection sealing is the preferred option.
With the offshore oil exploration and development, China gradually masters the geological conditions of the near sea and the far sea, and multiple researches show that China's CO in the near sea and the far sea 2 The potential of geological sequestration is huge, and the geological sequestration has the conditions of engineering practice; wherein liquid CO is passed through 2 Transporting the liquid CO by ship 2 Transporting to a sequestration site, and realizing CO by an injection platform 2 Input sealing is a feasible and efficient scheme.
Disclosure of Invention
The invention provides a supercritical CO on the sea 2 Injection into a sequestration system to achieve liquid CO 2 Supercritical and continuous efficient injection of saline water for sequestration.
In order to achieve the above object, the present invention provides a supercritical CO at sea 2 An injection sequestration system comprising a first liquid CO disposed in a tank of an injection platform 2 Storage tank and second liquid CO 2 The storage tank is internally provided with a first deep well pump and a second deep well pump which are respectively matched and respectively pass through liquid CO 2 The main pipe is communicated with the steady flow buffer tank;
a pipeline at the bottom of the steady flow buffer tank is provided with a steady flow buffer tank outlet shutoff valve and a steady flow buffer tank outlet control valve; the first filling pump and the second filling pump are respectively communicated to the pressurizing pump through the pipeline; the pressure pump is respectively communicated with the first heater and the second heater through pipelines;
the first heater and the second heater pass supercritical CO 2 The main pipe is communicated with supercritical CO in sequence 2 Injecting the mixture into a manifold; the supercritical CO 2 Injection manifold through supercritical CO 2 The injection pipeline and the injection well are communicated with a brine layer of a sealed place.
Preferably, the outlet pipes of the first deep well pump and the second deep well pump are respectively provided with a remote control valve and a check valve.
Preferably, the pressure of the pressurizing pump is 20-30 Mpa.
Preferably, the first heater and the second heater are heated to 40 ℃ to reach a supercritical state.
Preferably, the supercritical CO 2 The main pipe is provided with a stop check valve and an emergency stop valve.
Preferably, the injection platform is a floating platform or a fixed platform.
Preferably, the first liquid CO 2 A storage tank and the second liquid CO 2 The storage tanks are arranged along the length direction of the injection platform.
Preferably, a steady flow buffer tank is arranged on one side of the injection platform in the width direction close to one end of the head, and the first filling pump, the second filling pump, the pressure pump, the first heater and the second heater are sequentially arranged on the other side of the injection platform.
Preferably, the pressurizing pump is located at a position intermediate the priming pump and the heater.
Preferably, the supercritical CO 2 An injection manifold is disposed at the injection platform head.
The invention has the advantages that:
the invention is suitable for offshore liquid CO 2 Post-supercritical injection process, supercritical equipment can be integrated with liquid CO 2 A transport vessel, a fixed platform and a floating platform of the storage tank; supercritical CO 2 The injection manifold may be integrated at an injection platform or wellhead platform; the system has very wide applicability. According to CO 2 Physical Properties of the inventive System, CO 2 The supercritical process is designed to be pressurized and then heated, and the process has the lowest energy consumption; the system is provided with a steady flow buffer tank and a filling pump for gas-liquid separation and preliminary pressurization, and can realize liquid CO 2 Stable and continuous entering the pressurizing pump.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is an overall structural view of embodiment 2 of the present invention;
FIG. 3 is a side view of embodiment 2 of the present invention;
wherein: 1. note thatIn a plateau, 2, first liquid CO 2 Storage tank, 3, first deep-well pump, 4, second liquid CO 2 Storage tank, 5, second deep-well pump, 6, liquid CO 2 A main pipe, 7, a steady flow buffer tank, 8, a steady flow buffer tank outlet shutoff valve, 9, a steady flow buffer tank outlet control valve, 10, a first filling pump, 11, a second filling pump, 12, a pressure pump, 13, a first heater, 14, a second heater, 15, a stop check valve, 16, an emergency shutoff valve, 17, supercritical CO 2 Main pipe, 18, supercritical CO 2 Injection manifold, 19, supercritical CO 2 Injection line, 20, injection well, 21, brine layer, 22, sequestration.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in figure 1, the invention relates to an offshore supercritical CO 2 The injection sealing system comprises an injection platform 1, wherein a first liquid CO is arranged in a cabin of the injection platform 1 2 Tank 2 and second liquid CO 2 The storage tank 4 is internally provided with a first deep-well pump 3 and a second deep-well pump 5 correspondingly; first liquid CO 2 Liquid CO in the tank 2 2 Passing through a first deep-well pump 3 and a second liquid CO 2 Liquid CO in the tank 4 2 Liquid CO is collected after the transfer of the second deep well pump 5 2 Main pipe 6, liquid CO 2 By liquid CO 2 The main pipe 6 enters a steady flow buffer tank 7; remote control valves and check valves are arranged on outlet pipelines of the first deep-well pump 3 and the second deep-well pump 5; liquid CO 2 Gas-liquid separation is carried out in a steady flow buffer tank 7, and gas CO is obtained 2 Entering a boil-off gas treatment system and obtaining liquid CO 2 Entering a bottom pipeline, wherein a steady flow buffer tank outlet shutoff valve 8 and a steady flow buffer tank outlet control valve 9 are arranged on the bottom pipeline of the buffer tank 7; liquid CO 2 Pressurized by a first perfusion pump 10 and a second perfusion pump 11 and then enters a pressurizing pump 12, and liquid CO 2 The pressure of the injection pipe reaches the required injection pressure, which is about 20-30 Mpa; pressurized liquid CO 2 The mixture enters a first heater 13 and a second heater 14 in parallel through pipelines, and the temperature is about 40 ℃ after the mixture is heated, so that the mixture reaches a supercritical state; supercritical CO 2 By supercritical CO 2 Main pipe 17 into supercritical CO 2 Injection manifold 18, supercritical CO 2 A stop check valve 15 and an emergency shut-off valve 16 are arranged on the main pipe 17; supercritical CO 2 By supercritical CO 2 An injection pipeline 19 and an injection well 20 reach a brine layer 21 of a sealed place 22; realization of CO 2 Continuous high efficiency injection sequestration.
One specific implementation is shown in fig. 2, where the injection platform 1 is a floating or fixed platform, and the first liquid CO is a liquid CO 2 Tank 2 and second liquid CO 2 The storage tanks 4 are arranged along the length direction of the injection platform 1, and the first deep-well pump 3 and the second deep-well pump 5 are respectively positioned in the first liquid CO 2 Storage tank 2 and second liquid CO 2 The central position of the storage tank 4; a steady flow buffer tank 7 is arranged on one side of the injection platform 1 close to one end of the head in the width direction, a first injection pump 10, a second injection pump 11, a pressure pump 12, a first heater 13 and a second heater 14 are sequentially arranged on the injection platform 1, and the pressure pump 12 is positioned in the middle of the first injection pump 10, the second injection pump 11, the first heater 13 and the second heater 14; the head of the injection platform 1 is provided with supercritical CO 2 And into manifold 18.
Figure 2 the injection platform 1 is of the floating platform type only inventive offshore supercritical CO 2 One embodiment of an injection sequestration system, which is also suitable for liquid CO 2 A transport ship of the storage tank, a fixed platform, a floating platform and the like.
Fig. 3 is a side view of the system of the invention in fig. 2, and the steady flow buffer tank 7, the first infusion pump 10 and the second infusion pump 11, the booster pump 12 and the first heater 13 and the second heater 14 are arranged on the deck surface in sequence, so that the equipment is compact in arrangement.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. Offshore supercritical CO 2 Injection-encapsulation system, its special featuresCharacterized in that it comprises a first liquid CO arranged in a tank of the injection platform (1) 2 A storage tank (2) and a second liquid CO 2 A storage tank (4) in which a first deep well pump (3) and a second deep well pump (5) are respectively arranged in a matching way and respectively pass through liquid CO 2 The main pipe (6) is communicated with a steady flow buffer tank (7);
a pipeline at the bottom of the steady flow buffer tank (7) is provided with a steady flow buffer tank outlet shutoff valve (8) and a steady flow buffer tank outlet control valve (9); and respectively communicating the first perfusion pump (10) and the second perfusion pump (11) to the pressurizing pump (12) through the pipelines; the pressure pump (12) is respectively communicated with a first heater (13) and a second heater (14) through pipelines;
the first heater (13) and the second heater (14) are heated by supercritical CO 2 The main pipe (17) is communicated with supercritical CO in sequence 2 An injection manifold (18); the supercritical CO 2 Injection manifold (18) through supercritical CO 2 The injection line (19) and the injection well (20) communicate with a brine layer (21) of a sequestration site (22).
2. The supercritical CO of claim 1 2 The injection sealing system is characterized in that the outlet pipelines of the first deep-well pump (3) and the second deep-well pump (5) are respectively provided with a remote control valve and a check valve.
3. The supercritical CO of claim 1 2 The injection and sealing system is characterized in that the pressure of the pressure pump (12) is 20-30 Mpa.
4. The supercritical CO of claim 1 2 The injection sealing system is characterized in that the first heater (13) and the second heater (14) are heated to 40 ℃ to reach a supercritical state.
5. The supercritical CO of claim 1 2 Injection sequestration system characterized in that said supercritical CO 2 The main pipe (17) is provided with a stop check valve (15) and an emergency shut-off valve (16).
6.The supercritical CO of claim 1 2 The injection and sealing system is characterized in that the injection platform (1) is a floating platform or a fixed platform.
7. The supercritical CO of claim 1 2 An injection sequestration system characterized in that said first liquid CO 2 A storage tank (2) and the second liquid CO 2 The storage tanks (4) are arranged along the length direction of the injection platform (1).
8. The supercritical CO of claim 1 2 The injection sealing system is characterized in that a steady flow buffer tank (7) is arranged on one side of the injection platform (1) close to the width direction of one end of the head, and a first injection pump (10), a second injection pump (11), a pressure pump (12), a first heater (13) and a second heater (14) are sequentially arranged on the other side of the injection platform.
9. The supercritical CO of claim 8 2 The injection-sequestration system characterized in that said pressurizing pump (12) is located in an intermediate position between said first infusion pump (10), said second infusion pump (11) and said first and second heaters (13, 14).
10. The supercritical CO of claim 1 2 Injection sequestration system characterized in that said supercritical CO 2 An injection manifold (18) is arranged at the head of the injection platform (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220084914.0U CN217422947U (en) | 2022-01-13 | 2022-01-13 | Offshore supercritical CO 2 Injection sealing system |
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| CN202220084914.0U CN217422947U (en) | 2022-01-13 | 2022-01-13 | Offshore supercritical CO 2 Injection sealing system |
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| CN217422947U true CN217422947U (en) | 2022-09-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115596993A (en) * | 2022-12-12 | 2023-01-13 | 中海油能源发展股份有限公司采油服务分公司（Cn） | Liquefied CO 2 Offshore oilfield pressure injection device and method |
| CN116220808A (en) * | 2023-03-02 | 2023-06-06 | 中国矿业大学 | Low permeability reservoir CO 2 Geological sealing single well injection parameter optimization method |
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2022
- 2022-01-13 CN CN202220084914.0U patent/CN217422947U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115596993A (en) * | 2022-12-12 | 2023-01-13 | 中海油能源发展股份有限公司采油服务分公司（Cn） | Liquefied CO 2 Offshore oilfield pressure injection device and method |
| CN116220808A (en) * | 2023-03-02 | 2023-06-06 | 中国矿业大学 | Low permeability reservoir CO 2 Geological sealing single well injection parameter optimization method |
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