Associated gas power generation exhaust gas reinjection system

Abstract

This utility model discloses an associated gas power generation tail gas reinjection system, including a gas-liquid mixer connected to a tail gas outlet pipe and a liquid-liquid mixer. The liquid-liquid mixer is connected to the bottom of an oil well produced water storage tank and an additive storage tank via pipelines. A compressor and a gas-liquid distribution mechanism are sequentially connected to the outlet of the gas-liquid mixer. The gas-liquid distribution mechanism includes a main distribution pipe connected to the compressor outlet, with multiple branch distribution pipes connected to it. The outlets of the branch distribution pipes are connected to the injection well. This utility model provides an associated gas power generation tail gas reinjection system that can utilize associated gas power generation tail gas to increase production, reduce the gas injection cost for oilfield production enhancement, and achieve synergistic reinjection of power generation tail gas and oil well produced water, thereby improving sweep efficiency.

Description

Technical Field

[0001] This utility model relates to an associated gas power generation tail gas reinjection system, belonging to the field of oilfield production enhancement technology. Background Technology

[0002] Oilfield enhancement technologies are a core component of improving oil recovery (EOR). Traditional gas injection enhancement technologies mainly include carbon dioxide flooding, nitrogen flooding, and natural gas reinjection. Existing gas injection enhancement technologies have the following problems:

[0003] Relying on external gas sources (such as liquid CO2 transportation) is costly and poses supply chain risks.

[0004] Traditional pure gas injection suffers from low sweep efficiency, resulting in a large amount of crude oil not being effectively displaced, which seriously affects the effect of improving oil recovery.

[0005] Conventional natural gas reinjection requires the construction of a dedicated compression station, with equipment investment accounting for more than 40% of the increased production cost.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0007] This invention addresses the shortcomings of the prior art by providing an associated gas power generation tail gas reinjection system. This system can utilize associated gas power generation tail gas to increase production, reduce the gas injection cost for oilfield production, and achieve synergistic reinjection of power generation tail gas and oil well produced water, thereby improving sweep efficiency.

[0008] To solve the above technical problems, the present invention adopts the following technical solution:

[0009] The associated gas power generation tail gas reinjection system includes a gas-liquid mixer, which is connected to the tail gas outlet pipe and a liquid-liquid mixer. The liquid-liquid mixer is connected to the bottom of the well produced water storage tank and the additive storage tank via pipelines. The outlet of the gas-liquid mixer is connected in sequence to a compressor and a gas-liquid distribution mechanism. The gas-liquid distribution mechanism includes a main distribution pipe connected to the compressor outlet, and multiple branch distribution pipes connected to the main distribution pipe are installed on the main distribution pipe. The outlet of the branch distribution pipes is connected to the gas injection well.

[0010] Furthermore, the exhaust pipe is connected to the exhaust port of the associated gas generator set, and the exhaust pipe delivers the power generation exhaust gas to the gas-liquid mixer.

[0011] Furthermore, both the gas-liquid mixer and the liquid-liquid mixer are Venturi tube structures.

[0012] Furthermore, the end inlet of the gas-liquid mixer is connected to the end of the exhaust pipe.

[0013] Furthermore, the throat inlet of the gas-liquid mixer is connected to the outlet of the liquid-liquid mixer.

[0014] Furthermore, the outlet of the gas-liquid mixer is connected to the inlet of the compressor.

[0015] Furthermore, the end inlet of the liquid-liquid mixer is connected to the bottom of the oil well's produced water storage tank via a produced water inlet pipe, and a water pump is installed on the produced water inlet pipe.

[0016] Furthermore, the throat inlet of the liquid-liquid mixer is connected to the bottom of the additive storage tank via an additive inlet pipe.

[0017] Furthermore, the outlet of the compressor is connected to the inlet of the gas-liquid distribution mechanism.

[0018] Furthermore, regulating valves are installed on the ends of the distribution branches near the main distribution pipe.

[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0020] The exhaust gas from the power generation enters the gas-liquid mixer. At the same time, the liquid-liquid mixer mixes the additive with the produced water from the oil well and then delivers it to the gas-liquid mixer. The exhaust gas from the power generation, the produced water from the oil well, and the additive are mixed in proportion to form a gas-liquid two-phase flow. The two-phase flow is pressurized to a supercritical state by the compressor and then injected into each injection well through the gas-liquid distribution mechanism.

[0021] This invention enables the coordinated injection of power generation exhaust gas and oil well produced water, which can improve sweep efficiency compared to traditional pure gas injection. This invention also utilizes associated gas from power generation exhaust gas to increase production and reduce the gas injection cost for oilfield production.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram showing the connection between the gas-liquid mixer and the liquid-liquid mixer;

[0025] Figure 3 This is a schematic diagram of the distribution mechanism.

[0026] In the diagram, 1-gas-liquid mixer, 2-exhaust gas outlet pipe, 3-compressor, 4-gas-liquid distribution mechanism, 41-distribution main pipe, 42-distribution branch pipe, 43-regulating valve, 5-liquid-liquid mixer, 6-produced water inlet pipe, 7-oil well produced water storage tank, 8-additive inlet pipe, 9-additive storage tank. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0028] like Figures 1-3 As shown in the figure, this utility model provides a gas-liquid power generation tail gas reinjection system, including a gas-liquid mixer 1, which is connected to a tail gas outlet pipe 2 and a liquid-liquid mixer 5. The liquid-liquid mixer 5 is connected to the bottom of an oil well produced water storage tank 7 and an additive storage tank 9 through pipelines. The outlet of the gas-liquid mixer 1 is connected in sequence to a compressor 3 and a gas-liquid distribution mechanism 4.

[0029] The exhaust pipe 2 is connected to the exhaust port of the associated gas generator set, and the exhaust pipe 2 is used to transport the exhaust gas from the power generation unit to the gas-liquid mixer 1.

[0030] Both the gas-liquid mixer 1 and the liquid-liquid mixer 5 are Venturi tube structures.

[0031] The gas-liquid mixer 1 is used to mix the exhaust gas from power generation with the water produced from the oil well and additives to form a gas-liquid two-phase flow.

[0032] The end inlet of the gas-liquid mixer 1 is connected to the end of the exhaust pipe 2, the throat inlet of the gas-liquid mixer 1 is connected to the outlet of the liquid-liquid mixer 5, and the outlet of the gas-liquid mixer 1 is connected to the inlet of the compressor 3.

[0033] The liquid-liquid mixer 5 mixes the additive with the oil well produced water, and the additive is added to reduce the interfacial tension.

[0034] The end inlet of the liquid-liquid mixer 5 is connected to the bottom of the oil well production water storage tank 7 through the production water inlet pipe 6. A water pump is installed on the production water inlet pipe 6. The throat inlet of the liquid-liquid mixer 5 is connected to the bottom of the additive storage tank 9 through the additive inlet pipe 8.

[0035] The outlet of the compressor 3 is connected to the inlet of the gas-liquid distribution mechanism 4. The compressor 3 pressurizes the gas-liquid two-phase flow to a supercritical state, and then injects it into the target oil layer after passing through the gas-liquid distribution mechanism 4.

[0036] The gas-liquid distribution mechanism 4 includes a main distribution pipe 41 connected to the outlet of the compressor 3. Multiple branch distribution pipes 42 connected to the main distribution pipe 41 are installed on the main distribution pipe 41. The outlet of the branch distribution pipe 42 is connected to the gas injection well.

[0037] Each branch pipe 42 is equipped with a regulating valve 43 at the end near the main branch pipe 41. The regulating valve 43 is used to regulate the amount of gas injected.

[0038] The specific working principle of this utility model is as follows:

[0039] The exhaust gas from the power generation is transported from the exhaust gas outlet pipe 2 to the gas-liquid mixer 1. At the same time, the liquid-liquid mixer 5 mixes the additive with the produced water from the oil well and then transports it to the gas-liquid mixer 1. The exhaust gas from the power generation, the produced water from the oil well, and the additive are mixed in proportion to form a gas-liquid two-phase flow. Then the compressor 3 pressurizes the gas-liquid two-phase flow to a supercritical state and then injects it into each injection well through the gas-liquid distribution mechanism 4.

[0040] This invention enables the coordinated injection of power generation exhaust gas and oil well produced water, which can improve sweep efficiency compared to traditional pure gas injection.

[0041] This invention utilizes associated gas from power generation tail gas to increase production and reduce the gas injection cost for oilfield production increases.

[0042] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A system for reinjection of flue gas from a power plant using associated gas, characterized in that: It includes a gas-liquid mixer (1), which is connected to the tail gas outlet pipe (2) and the liquid-liquid mixer (5). The liquid-liquid mixer (5) is connected to the bottom of the oil well produced water storage tank (7) and the additive storage tank (9) through pipelines. The outlet of the gas-liquid mixer (1) is connected to a compressor (3) and a gas-liquid distribution mechanism (4) in sequence. The gas-liquid distribution mechanism (4) includes a distribution main pipe (41) connected to the outlet of the compressor (3). Multiple distribution branch pipes (42) are installed on the distribution main pipe (41) and connected to it. The outlet of the distribution branch pipe (42) is connected to the gas injection well.

2. The system of claim 1, wherein: The exhaust pipe (2) is connected to the exhaust port of the associated gas generator set, and the exhaust pipe (2) delivers the power generation exhaust gas to the gas-liquid mixer (1).

3. The system of claim 1, wherein: Both the gas-liquid mixer (1) and the liquid-liquid mixer (5) are Venturi tube structures.

4. The system of claim 3, wherein: The end inlet of the gas-liquid mixer (1) is connected to the end of the exhaust pipe (2).

5. The system of claim 4, wherein: The throat inlet of the gas-liquid mixer (1) is connected to the outlet of the liquid-liquid mixer (5).

6. The system of claim 5, wherein: The outlet of the gas-liquid mixer (1) is connected to the inlet of the compressor (3).

7. The associated gas power generation tail gas reinjection system as described in claim 6, characterized in that: The end inlet of the liquid-liquid mixer (5) is connected to the bottom of the oil well production water storage tank (7) through the production water inlet pipe (6), and a water pump is installed on the production water inlet pipe (6).

8. The associated gas power generation tail gas reinjection system as described in claim 7, characterized in that: The throat inlet of the liquid-liquid mixer (5) is connected to the bottom of the additive storage tank (9) through the additive inlet pipe (8).

9. The associated gas power generation tail gas reinjection system as described in claim 1, characterized in that: The outlet of the compressor (3) is connected to the inlet of the gas-liquid distribution mechanism (4).

10. The associated gas power generation tail gas reinjection system as described in claim 1, characterized in that: Each of the branch pipes (42) is equipped with a regulating valve (43) at the end near the main branch pipe (41).

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