Oil field fracturing carbon dioxide storage device

Abstract

The utility model discloses an oil field fracturing carbon dioxide storage device, which relates to the technical field of carbon dioxide storage and comprises a storage tank, a discharge pipe, a valve and an air bag type energy accumulator. The storage tank is sequentially communicated with a discharge pipe, a valve and an air bag type energy accumulator; and a feeding hole is formed in the top of the storage tank. The air bag type energy accumulator is connected behind the valve of the oil field fracturing carbon dioxide storage device, dynamic pressure buffering can be achieved, and the dynamic response capacity to the water hammer effect when the valve is closed is improved.

Description

Technical Field

[0001] This application relates to the field of carbon dioxide storage technology, and in particular to a carbon dioxide storage device for oilfield fracturing. Background Technology

[0002] With the widespread application of carbon dioxide enhanced oil recovery (CO2-IF) technology in oilfield fracturing, the safety of high-pressure carbon dioxide storage and transportation has become a key issue restricting process efficiency. In oilfield fracturing operations, carbon dioxide needs to be stored in a supercritical state in high-pressure tanks and rapidly released downhole through discharge pipelines. However, at the moment of valve closure, the transient pressure change in the pipeline can easily trigger water hammer, leading to pipeline vibration, seal failure, and even equipment damage, seriously threatening operational safety. Therefore, developing a carbon dioxide storage device with efficient pressure buffering capabilities is of great significance for ensuring the continuity of oilfield fracturing operations and extending equipment lifespan.

[0003] In the prior art, Chinese patent CN220471343U discloses an oilfield fracturing carbon dioxide storage unit, including a discharge pipe that is fixedly connected to and interconnected with tanks. At least two connecting pipes with flanges are fixedly connected to the outer wall of the tank. An outer shell is fixedly connected to the port of the discharge pipe. The outer shell has a cavity, and a baffle structure that restricts backflow is set inside the cavity of the outer shell. High-pressure liquefied carbon dioxide in the tank is discharged through the discharge pipe, and the gas enters the outer shell. The gas flows between multiple first baffles and second baffles, and the gas flow trajectory is serpentine. When the valve is closed to stop the gas supply, the gas backflows and impacts the second baffle and the first baffle, increasing the resistance during gas backflow, mitigating the water hammer effect, better protecting the discharge pipe and the tank, and contributing to safe operation.

[0004] However, the core of the water hammer effect is transient pressure fluctuation. The existing technologies mentioned above cannot quickly respond to extreme working conditions (such as instantaneous valve closure) by relying solely on the fixed flow channel resistance of the stop structure. They lack dynamic pressure buffering and have poor dynamic response capability to the water hammer effect when the valve is closed. Utility Model Content

[0005] This application provides an oilfield fracturing carbon dioxide storage device to solve the problem that existing oilfield fracturing carbon dioxide storage devices lack dynamic pressure buffering and have poor dynamic response to water hammer effects when valves are closed.

[0006] On the one hand, this application provides an oilfield fracturing carbon dioxide storage device, including: a storage tank, a discharge pipe, valves, and a bladder-type accumulator.

[0007] The storage tank is connected in sequence to the discharge pipe, the valve, and the airbag accumulator.

[0008] The storage tank is provided with a feed inlet at the top.

[0009] In one possible implementation, a pressure sensor is installed on the pipe between the valve and the bladder accumulator.

[0010] In one possible implementation, the storage tank has a spare interface on its side wall.

[0011] In one possible implementation, the outlet of the bladder-type accumulator is connected to a periodically expanding and contracting channel.

[0012] In one possible implementation, the outlet of the periodically expanding and contracting channel is connected to a stop housing.

[0013] The interior of the stop housing is provided with a stop structure for limiting backflow.

[0014] In one possible implementation, the stop structure includes a plurality of first side plates and a plurality of second side plates.

[0015] The first side plate and the second side plate are symmetrically fixedly disposed on the inner front and rear side walls of the stop housing.

[0016] Several first side plates and several second side plates are arranged at equal intervals and inclined to form several horn grooves, and the tightening opening of the horn grooves points to the outlet of the stop housing.

[0017] In one possible implementation, the lengths of the plurality of first side plates and the plurality of second side plates gradually increase along the outlet direction of the stop housing, and the diameter of the tightening opening of the plurality of horn slots gradually decreases along the outlet direction of the stop housing.

[0018] In one possible implementation, both the first side plate and the second side plate are rectangular plates.

[0019] The oilfield fracturing carbon dioxide storage device disclosed in this application has the following advantages:

[0020] By connecting a bladder-type accumulator after the valve of the carbon dioxide storage unit in the oilfield fracturing, dynamic pressure buffering can be achieved, improving the dynamic response capability to the water hammer effect when the valve is closed.

[0021] The proposed pressure sensor improves the monitorability of the buffering effect of the airbag accumulator.

[0022] The proposed periodic expanding and contracting channel can smooth changes in fluid velocity, reduce pressure fluctuations caused by sudden changes in velocity, and reduce the destructive force of water hammer when the valve is closed. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an oilfield fracturing carbon dioxide storage device provided in an embodiment of this application;

[0025] Figure 2 This is a top cross-sectional view of the stop housing provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Storage tank, 11-Inlet, 12-Discharge pipe, 13-Spare interface, 2-Valve, 3-Pressure sensor, 4-Airbag accumulator, 5-Periodic gradually expanding and contracting channel, 6-Stop housing, 61-First side plate, 62-Second side plate, 63-Sounding groove. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] like Figure 1 As shown in the figure, this application provides an oilfield fracturing carbon dioxide storage device, including: a storage tank 1, a discharge pipe 12, a valve 2, and a bladder-type accumulator 4.

[0030] The storage tank 1 is connected in sequence to the discharge pipe 12, the valve 2, and the airbag accumulator 4.

[0031] The storage tank 1 is provided with a feed inlet 11 at the top.

[0032] Specifically, in this embodiment, the discharge pipe 12 is a Y-shaped pipe, with its two ends connected to the storage tank 1 and its single end connected to the valve 2. In other possible embodiments, the discharge pipe 12 may also be other types of pipes. In this embodiment, the valve 2 is a one-way check valve.

[0033] For example, a pressure sensor 3 is installed on the pipeline between the valve 2 and the airbag accumulator 4.

[0034] Specifically, in this embodiment, the air pressure sensor 3 is used to monitor the air pressure in the pipeline between the valve 2 and the airbag accumulator 4, thereby monitoring the buffering effect of the airbag accumulator 4 when the valve 2 is closed.

[0035] For example, the storage tank 1 is provided with a spare interface 13 on its side wall.

[0036] Specifically, when the inlet 11 or the outlet 12 of the storage tank 1 malfunctions, the spare interface 13 can be used to replace the malfunctioning inlet and continue to work.

[0037] For example, the outlet of the airbag accumulator 4 is connected to a periodically expanding and contracting channel 5.

[0038] Specifically, the periodically expanding and contracting channel 5 can smooth out changes in fluid velocity, reduce pressure fluctuations caused by sudden changes in velocity, and reduce the destructive force of water hammer effect when valve 2 is closed.

[0039] For example, the outlet of the periodically expanding and contracting channel 5 is connected to a stop housing 6.

[0040] The interior of the stop housing 6 is provided with a stop structure for limiting backflow.

[0041] like Figure 2 As shown, exemplarily, the blocking structure includes a plurality of first side plates 61 and a plurality of second side plates 62.

[0042] The first side plate 61 and the second side plate 62 are symmetrically fixedly disposed on the front and rear side walls inside the stop housing 6.

[0043] Several first side plates 61 and several second side plates 62 are arranged at equal intervals and inclined to form several horn grooves 63, and the tightening opening of the horn grooves 63 points to the outlet of the stop housing 6.

[0044] Specifically, in this embodiment, three first side plates 61 and three second side plates 62 are provided. The first side plate 61 is fixedly disposed on the inner rear side wall of the stop housing 6, and the angle between the first side plate 61 and the inner rear side wall of the stop housing 6 is 30 degrees. The second side plate 62 is fixedly disposed on the inner front side wall of the stop housing 6, and the angle between the second side plate 62 and the inner front side wall of the stop housing 6 is 30 degrees.

[0045] For example, the lengths of the plurality of first side plates 61 and the plurality of second side plates 62 gradually increase along the outlet direction of the stop housing 6, and the diameter of the tightening opening of the plurality of horn grooves 63 gradually decreases along the outlet direction of the stop housing 6.

[0046] For example, both the first side plate 61 and the second side plate 62 are rectangular plates.

[0047] Specifically, in this embodiment, the stop shell 6 is a cuboid structure, and the first side plate 61 and the second side plate 62 are both rectangular plates to facilitate fitting with the upper and lower sides of the stop shell 6 and avoid gaps.

[0048] In this embodiment, the working principle of the oilfield fracturing carbon dioxide storage device is as follows: Initially, the inlet 11 and the spare interface 13 of the storage tank 1 are closed, and the valve 2 is closed. The storage tank 1 stores high-pressure supercritical carbon dioxide fluid. When it is necessary to deliver carbon dioxide to the well, the valve 2 is opened, and the carbon dioxide fluid is discharged from the discharge pipe 12. It passes through the valve 2, the bladder accumulator 4, and the periodically expanding and contracting channel 5 in sequence, enters the interior of the stop shell 6, and flows through the trumpet groove 63. From the tightening port of the trumpet groove 63, it flows to the outlet of the stop shell 6 and is delivered to the well along the pipeline. When it is necessary to stop the delivery, the valve 2 is closed. Due to the water hammer effect, the carbon dioxide fluid will... In the backflow, the fluid first impacts the longest first side plate 61 and second side plate 62 inside the stop housing 6. Part of the fluid passes through the horn groove 63, while the other part enters the gap between the adjacent first side plate 61 and second side plate 62. After being decelerated by multiple sets of first side plates 61 and second side plates 62, it reaches the periodically expanding and contracting channel 5. The periodically expanding and contracting channel 5 further alleviates the transient pressure fluctuations caused by water hammer, smooths the changes in fluid velocity, and reduces pressure fluctuations. The fluid continues to backflow to the airbag accumulator 4. The airbag accumulator 4 can achieve dynamic pressure buffering, further reducing the fluid impact force, and ultimately reducing the instantaneous impact damage of fluid backflow to valve 2 and pipeline.

[0049] In this embodiment, by connecting a bladder-type accumulator 4 after the valve 2 of the oilfield fracturing carbon dioxide storage device, dynamic pressure buffering can be achieved, improving the dynamic response capability to the water hammer effect when the valve 2 is closed.

[0050] The proposed pressure sensor 3 improves the monitorability of the buffering effect of the airbag accumulator 4.

[0051] The proposed periodic expanding and contracting channel 5 can smooth the changes in fluid velocity, reduce pressure fluctuations caused by sudden changes in flow velocity, and reduce the destructive force of water hammer effect when valve 2 is closed.

[0052] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0053] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A carbon dioxide storage device for oilfield fracturing, characterized in that, include: Storage tanks, discharge pipes, valves, and bladder-type accumulators; The storage tank is connected in sequence to the discharge pipe, the valve, and the airbag accumulator; The storage tank is provided with a feed inlet at the top.

2. The oilfield fracturing carbon dioxide storage device according to claim 1, characterized in that, A pressure sensor is installed on the pipe between the valve and the bladder accumulator.

3. The oilfield fracturing carbon dioxide storage device according to claim 1, characterized in that, The storage tank is provided with a spare interface on its side wall.

4. The oilfield fracturing carbon dioxide storage device according to claim 1, characterized in that, The outlet of the airbag accumulator is connected to a periodically expanding and contracting channel.

5. The oilfield fracturing carbon dioxide storage device according to claim 4, characterized in that, The outlet of the periodically expanding and contracting channel is connected to a stop shell. The interior of the stop housing is provided with a stop structure for limiting backflow.

6. The oilfield fracturing carbon dioxide storage device according to claim 5, characterized in that, The blocking structure includes several first side plates and several second side plates; The first side plate and the second side plate are symmetrically fixedly disposed on the inner front and rear side walls of the stop housing; Several first side plates and several second side plates are arranged at equal intervals and inclined to form several horn grooves, and the tightening opening of the horn grooves points to the outlet of the stop housing.

7. The oilfield fracturing carbon dioxide storage device according to claim 6, characterized in that, The lengths of the first side plates and the second side plates gradually increase along the outlet direction of the stop housing, and the diameters of the tightening openings of the horn grooves gradually decrease along the outlet direction of the stop housing.

8. The oilfield fracturing carbon dioxide storage device according to claim 6, characterized in that, Both the first side plate and the second side plate are rectangular plates.

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