Gas buffer device and blowout prevention system

Abstract

The utility model relates to the field of gas extraction, concretely relates to a gas buffer device and blowout prevention system, including gas -water separation tank, gas -water separation tank is in turn provided with N level, N is the integer of 2, and each level's gas -water separation tank is equipped with inlet and discharge port, wherein, at least last level's gas -water separation tank is equipped with suction port, the discharge port of upper level gas -water separation tank and the inlet of lower level gas -water separation tank are connected among two adjacent levels's gas -water separation tank. Through the application scheme, the gas buffer device has certain buffering effect, solves the problem that when the larger blowout hole danger occurs, the pressure becomes big, and the gas pipeline is damaged by the larger impact.

Description

Technical Field

[0001] This utility model relates to the field of gas extraction, specifically to a gas buffer device and a blowout prevention system. Background Technology

[0002] Chinese utility model patent CN222045702U discloses a gas-liquid separator and a gas extraction system. The gas extraction system includes a gas pipeline, a multi-port orifice, and a gas-liquid separator. The gas pipeline is used to collect the gas generated during drilling to effectively discharge gas from the rock strata and reduce the danger of gas accumulation. The gas-liquid separator separates the liquid and gas generated during drilling. The separated gas then enters the gas pipeline. At the same time, the gas-liquid separator also solves the problem of random gas and liquid discharge.

[0003] However, the gas extraction system described above still has the following drawbacks: When a major blowout occurs, the pressure of the oil and gas blowout will surge instantaneously, and the amount of gas entering the gas pipeline will increase dramatically. Since the pressure-bearing capacity of the gas pipeline is limited, the gas pipeline will be damaged by a large impact when the pressure increases. In addition, although the gas-liquid separator achieves gas-liquid separation, when a major blowout occurs, the gas (oil and gas) from the borehole blowout rushes into the gas-liquid separator, and the separator cannot quickly separate and contain the large amount of gas (oil and gas). The gas-liquid separator cannot separate the gas and liquid in time, and a large amount of gas (oil and gas) will rush out of the gas-liquid separator's discharge port into the environment, causing the environmental gas (oil and gas) levels to exceed the limit. Utility Model Content

[0004] The present invention aims to provide a gas buffer device and a blowout prevention system to solve the problem that when a large blowout occurs, the increased pressure will cause the gas pipeline to be damaged by a large impact.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas buffer device, comprising a gas-water separation box, wherein the gas-water separation box is arranged in N stages, where N is an integer ≥2, and each stage of the gas-water separation box is provided with an inlet and an outlet.

[0006] At least the last stage of the gas-liquid separator is equipped with an air extraction port;

[0007] In two adjacent gas-liquid separators, the discharge port of the upper gas-liquid separator is connected to the inlet of the lower gas-liquid separator.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a blowout prevention system, including a gas pipeline, an orifice multi-port device, and the gas buffer device of this application;

[0009] The orifice multi-port device includes a housing and a lower outlet located on the housing, with the lower outlet on the lower side of the housing; a feed pipe is connected between the lower outlet and the inlet of the first-stage gas-water separator; and a discharge pipe is connected between the gas pipeline and the exhaust port.

[0010] The principle and advantages of this application are as follows: During the drilling process, the liquid and gas generated during drilling enter the orifice multi-port device. Some liquids (water, oil, and slag) and gases flow out through the lower outlet and enter the gas buffer device (entering through the feed pipe from the inlet of the first-stage gas-liquid separator). Since the gas buffer device includes multiple gas-liquid separators, the medium flowing into the gas buffer device flows sequentially along the multiple gas-liquid separators. The multiple gas-liquid separators separate the liquid (water, oil, and slag) and gas. The liquid with a higher density is located at the bottom inside the gas-liquid separator, and the gas with a lower density is located at the top inside the gas-liquid separator, thus achieving liquid and gas separation. The separated liquid is discharged through the discharge port of the last stage, while the gas in the gas-liquid separator enters the gas pipeline through the exhaust port and discharge pipe and is collected.

[0011] Compared with existing technologies (which only have a single gas-liquid separator), this application proposes a multi-stage gas-liquid separator design. This increases the number of separators and allows for the storage of more liquid and gas. In the event of a large gas leak, a significant amount of gas and liquid will enter the multi-stage separator, which buffers, diverts, and reduces the pressure on the gas pipeline, thus preventing damage.

[0012] Furthermore, since the gas-liquid separator in this solution has multiple stages, when a large blowout occurs and gas (oil gas) from the borehole flows into the gas-liquid separator, the multi-stage gas-liquid separator can accommodate and separate a large amount of gas (oil gas) stage by stage. This is equivalent to extending the flow path of the medium in the gas-liquid separation and extending the gas-liquid separation time, thereby ensuring the gas-liquid separation function. In this way, when the liquid is discharged from the outlet of the last stage gas-liquid separator, it will not contain a large amount of gas, and the liquid discharged from the outlet will be relatively slow, avoiding the environmental gas (oil gas) exceeding the limit. This solves the problem of environmental gas (oil gas) exceeding the limit caused by a large amount of gas (oil gas) flowing out of the gas-liquid separator outlet into the environment in the prior art.

[0013] In this application, at least the last stage of the gas-liquid separator is equipped with an exhaust port, so that the gas separated from the gas-liquid mixture can be finally discharged from the exhaust port of the last stage gas-liquid separator. Of course, exhaust ports can also be provided on other stages of the gas-liquid separator, so that the gas separated in other stages can also be discharged into the gas pipeline.

[0014] Preferably, as an improvement to the gas buffer device, at least the first-stage gas-liquid separator is provided with a gas inlet.

[0015] Therefore, some of the gas in the orifice multi-port can also enter the gas buffer device through the gas inlet, thereby diverting and pressure-dividing the gas in the orifice multi-port, reducing the impact on the gas in the gas pipeline, and further ensuring the buffering effect on the gas pipeline.

[0016] At least the first-stage gas-liquid separator in this application is equipped with a gas inlet. Of course, gas inlets can also be provided on other stages of the gas-liquid separator, so that some of the gas in the orifice multi-port device can also enter the other stages of the gas-liquid separator.

[0017] Preferably, as an improvement to the gas buffer device, at least one stage is provided, in which a baffle is fixed inside the gas-water separator, and the inlet and outlet of the gas-water separator with the baffle are located on both sides of the baffle.

[0018] Therefore, the baffle acts as a barrier to the medium flowing in from the inlet, so that the medium flowing into the gas-liquid separator from the inlet will not directly enter the outlet and flow out. It has a direct discharge obstruction effect on the medium entering the gas-liquid separator, preventing the medium entering the gas-liquid separator from flowing out too quickly.

[0019] Preferably, as an improvement to the gas buffer device, the top of the baffle is fixedly connected to the top of the gas-water separator, and there is a gap between the bottom of the baffle and the bottom of the gas-water separator; the heights of the inlet and outlet of the gas-water separator are both higher than the bottom of the baffle.

[0020] Therefore, the baffle in this application also has the following functions: when there is a lot of liquid at the bottom of the gas-liquid separator, the liquid level at the bottom of the gas-liquid separator will be higher than the bottom of the baffle. At this time, the bottom of the baffle is inserted below the liquid level. In this way, the gas entering from the inlet is blocked by the baffle, and the gas needs to pass through the liquid to flow to the other side of the baffle. In this way, when the gas passes through the liquid, the liquid plays a filtering role on the gas. The liquid can remove small solid particles in the gas, thereby making the gas cleaner.

[0021] Preferably, as an improvement to the gas buffer device, the air extraction port is located at the top of the gas-liquid separator. Therefore, the air extraction port is far from the bottom of the gas-liquid separator, and liquid in the gas-liquid separator will not be drawn in during extraction.

[0022] Preferably, as an improvement to the gas buffer device, the gas outlet is located at the top of the gas-liquid separator. This way, the gas outlet is far from the bottom of the gas-liquid separator, and the gas will not agitate the liquid in the separator, thus preventing liquid splashing.

[0023] Preferably, as an improvement to the gas buffer device, N is 2.

[0024] Preferably, as an improvement to the blowout prevention system, the orifice multi-port has at least two upper exhaust ports on its top, at least one of which is connected to a gas pipeline, and the other upper exhaust ports are connected to a gas-liquid separator. Thus, during drilling, gas entering the orifice multi-port can be discharged into the gas pipeline through one of the upper exhaust ports and collected, while excess gas can enter the gas-liquid separator through the other upper exhaust ports. The gas-liquid separator performs appropriate flow and pressure division on the gas, reducing the impact of gas on the gas pipeline.

[0025] Preferably, as an improvement to the blowout preventer system, the diameter of the lower outlet is larger than that of the upper outlet. Since the medium flowing out of the lower outlet is mainly water, oil, and sludge, and the flow rate is relatively large, the diameter of the lower outlet is set to be larger. Conversely, the medium flowing out of the upper outlet is mainly gas, and since gas volume is relatively small, the diameter of the upper outlet is set to be smaller. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the blowout preventer system. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] The reference numerals in the accompanying drawings include: gas pipeline 1, first-stage gas-liquid separator 2, second-stage gas-liquid separator 3, exhaust port 4, gas inlet 5, baffle 6, orifice multi-port 7, borehole sleeve 8, drill rod 9, blowout preventer 10, upper outlet 11, lower outlet 12, feed pipe 13, discharge pipe 14, inlet 15, outlet 16, rock stratum 17.

[0029] The basic implementation examples are as follows: Figure 1 As shown: This embodiment discloses a gas buffer device, including a gas-water separation box, which is arranged in N stages. In this embodiment, there is one gas-water separation box in each stage. Of course, in other embodiments, there can be multiple gas-water separation boxes in each stage, and multiple gas-water separation boxes are arranged in parallel.

[0030] N is an integer ≥ 2; in this embodiment, N = 2 is used as an example. Each stage of the gas-water separator is provided with an inlet 15 and an outlet 16, which are located on the left and right sides of the gas-water separator, respectively. In adjacent stages of the gas-water separator, the outlet 16 of the upper stage is connected to the inlet 15 of the lower stage. Specifically, in this embodiment, the outlet 16 of the first stage gas-water separator 2 and the inlet of the second stage gas-water separator 3 are connected by a pipe.

[0031] In this embodiment, the top of the second-stage gas-liquid separator 3 is provided with an air extraction port 4. Of course, in other embodiments, when N is greater than 2, the air extraction port 4 can be provided not only on the top of the last-stage gas-liquid separator, but also on the top of other gas-liquid separators.

[0032] In this embodiment, the top of the first-stage gas-liquid separator 2 is provided with a gas inlet 5. Of course, in other embodiments, when N is greater than 2, the gas inlet 5 can be provided not only at the top of the first-stage gas-liquid separator 2, but also at the top of other gas-liquid separators.

[0033] In this embodiment, baffles 6 are fixed inside the first-stage gas-liquid separator 2 and the second-stage gas-liquid separator 3 (e.g., by welding). The inlet 15 and outlet 16 of the gas-liquid separator are located on opposite sides of the baffle 6. The top of the baffle 6 is fixedly connected (e.g., welded) to the top of the gas-liquid separator, and there is a gap between the bottom of the baffle 6 and the bottom of the gas-liquid separator, which serves as a channel for the flow of liquid and gas. The heights of the inlet 15 and outlet 16 of the first-stage gas-liquid separator 2 are both higher than the bottom of the baffle 6. For the second-stage gas-liquid separator 3, the inlet height is higher than the bottom of the baffle 6, while the height of the outlet is not specifically limited to whether it is higher than the bottom of the baffle 6.

[0034] This embodiment also discloses a blowout prevention system, including a gas pipeline 1, an orifice multi-port device 7, and a gas buffer device of this embodiment.

[0035] The orifice multi-port device 7 includes a housing and an upper outlet 11 and a lower outlet 12 located on the housing. The housing has an internal chamber. An inner sleeve 8 is located on the left side of the housing, communicating with the housing chamber. The inner sleeve 8 and the housing can be connected by welding or by fixing with screws, etc. A drill rod inlet is located on the right side of the housing and communicates with the chamber. The drill rod inlet 9 communicates with the inner sleeve 8, and the drill rod inlet is used for inserting the drill rod 9. The upper outlet 11 is located at the top of the housing, and the lower outlet 12 is located at the bottom of the housing. Both the upper outlet 11 and the lower outlet 12 communicate with the chamber of the housing. In this embodiment, there are two upper outlets 11. One upper outlet 11 is connected to the gas pipeline 1, and the other upper outlet 11 is connected to the gas inlet 5 on the first-stage gas-water separator 2 via a blowout preventer pipeline 10. A feed pipe 13 is connected between the lower outlet 12 and the inlet 15 of the first-stage gas-liquid separator 2; a discharge pipe 14 is connected between the gas pipeline 1 and the exhaust port 4 of the second-stage gas-liquid separator 3. In other embodiments, the diameter of the lower outlet 12 is larger than the diameter of the upper outlet 11.

[0036] The specific implementation process is as follows: The drill rod 9 is inserted laterally into the drill rod 9 inlet, the drill rod 9 passes through the inner casing 8, and the drill rod 9 drills the working face of the rock stratum 17. In this embodiment, the drill rod 9 adopts the drill rod of the prior art. The drill rod 9 is equipped with a drill bit and a drive motor. The structure of the drill rod 9 and other components is the prior art, and its specific structure will not be described in detail here.

[0037] During drilling, the liquid and gas generated during drilling enter the casing 8 inside the borehole, and then through the casing 8 into the orifice multi-port device 7. Some liquids (water, oil, and slag) and a small amount of gas flow out through the lower outlet 12. The outflowing medium enters the first-stage gas-liquid separator 2 through the feed pipe 13 and flows out from the outlet 16 of the first-stage gas-liquid separator 2, then into the inlet of the second-stage gas-liquid separator 3. The liquid with higher density enters the first-stage gas-liquid separator 2 and the second-stage gas-liquid separator 3 and is located at the bottom of the separator, while the gas with lower density is located at the top, thus achieving gas and liquid separation. The separated liquid flows out from the outlet of the second-stage gas-liquid separator 3. The separated gas flows out through the exhaust port 4 and enters the gas pipeline for collection.

[0038] Meanwhile, during the drilling process, the gas in the orifice multi-port valve 7, being relatively light, is mainly discharged through the upper exhaust port 11 on the left side, and the discharged gas enters the gas pipeline 1 for collection. When there is a large amount of gas, the gas in the orifice multi-port valve 7 can also enter the gas inlet 5 through the upper exhaust port on the right side and the blowout preventer pipe 10, thereby entering the first-stage gas-water separator 2. This serves to divert and divide the gas in the orifice multi-port valve 7, preventing a large amount of gas from flowing into the gas pipeline 1 and causing a large impact on the gas pipeline 1.

[0039] In this embodiment, a two-stage gas-liquid separator is designed. The increased number of gas-liquid separators allows the multi-stage gas-liquid separator to hold more liquid and gas. In the event of a large blowout, a significant amount of gas and liquid will enter the multi-stage gas-liquid separator through the upper outlet 11 and lower outlet 12 on the right side. The multi-stage gas-liquid separator acts as a buffer, diverts, and divides the gas and liquid, reducing the impact on the gas pipeline 1 and thus preventing damage to the gas pipeline 1 from a large impact.

[0040] Furthermore, since the gas-liquid separator in this solution has two stages, when a large blowout occurs and gas (oil gas) from the borehole flows into the gas-liquid separator, the multi-stage gas-liquid separator can accommodate and separate a large amount of gas (oil gas) stage by stage. Compared with setting a single-stage gas-liquid separator, this is equivalent to extending the flow path of the medium in the gas-liquid separation, and extending the gas-liquid separation time, thereby ensuring the function of gas-liquid separation. In this way, when the liquid is discharged from the outlet of the last-stage gas-liquid separator, it will not contain a large amount of gas, and the liquid discharged from the outlet of the last-stage gas-liquid separator is also relatively slow, avoiding the environmental gas (oil gas) exceeding the limit. This solves the problem of environmental gas (oil gas) exceeding the limit caused by a large amount of gas (oil gas) flowing out of the gas-liquid separator outlet 16 into the environment in the prior art.

[0041] In this embodiment, the baffle 6 is used to block the medium flowing out of the inlet 15, preventing the medium flowing out of the inlet 15 from flowing directly out of the outlet 16, ensuring the residence time of the medium in the gas-water separator, thereby ensuring the gas-water separation effect, and preventing the problem of environmental gas exceeding the limit caused by the medium entering the gas-water separator before it can be separated when a large nozzle hazard occurs.

[0042] In addition, the baffle 6 in this application also has the following functions: when a large amount of liquid flows into the first-stage gas-liquid separator 2, since the inlet 15 and outlet 16 of the first-stage gas-liquid separator 2 are both higher than the bottom of the baffle 6, the liquid level at the bottom of the gas-liquid separator will be higher than the bottom of the baffle 6. At this time, the bottom of the baffle 6 is inserted below the liquid level. In this way, the gas entering from the inlet 15 is blocked by the baffle 6, and the gas needs to pass through the liquid to flow to the other side of the baffle 6. When the gas passes through the liquid, the liquid plays a role in filtering and cleaning the gas. The liquid can remove solid small particulate matter in the gas, thereby making the gas cleaner.

[0043] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A gas buffer device, comprising a gas-liquid separator, characterized in that: The gas-liquid separator is set up in N stages, where N is an integer ≥2. Each stage of the gas-liquid separator is equipped with an inlet and an outlet. At least the last stage of the gas-liquid separator is equipped with an air extraction port; In two adjacent gas-liquid separators, the discharge port of the upper gas-liquid separator is connected to the inlet of the lower gas-liquid separator.

2. A gas buffer device according to claim 1, characterized in that: in, At least the first-stage gas-liquid separator has a gas inlet.

3. A gas buffer device according to claim 1, characterized in that: At least one stage, the gas-water separator has a baffle fixed inside, and the inlet and outlet of the gas-water separator with the baffle are located on both sides of the baffle.

4. A gas buffer device according to claim 3, characterized in that: The top of the baffle is fixedly connected to the top of the gas-water separator, and there is a gap between the bottom of the baffle and the bottom of the gas-water separator; the height of the inlet and outlet of the gas-water separator is higher than the bottom of the baffle.

5. A gas buffer device according to claim 1, characterized in that: The air extraction port is located at the top of the gas-water separator.

6. A gas buffer device according to claim 2, characterized in that: The gas outlet is located at the top of the gas-water separator.

7. A gas buffer device according to any one of claims 1-6, characterized in that: N is 2.

8. A blowout preventer system, characterized in that: Includes gas pipelines, orifice multi-port devices, and the gas buffer device as described in any one of claims 1-7; The orifice multi-port includes a housing and a lower outlet located on the housing, the lower outlet being located on the lower side of the housing; a feed pipe is connected between the lower outlet and the inlet of the first-stage gas-water separator; and a discharge pipe is connected between the gas pipeline and the exhaust port.

9. The blowout preventer system according to claim 8, characterized in that: The top of the orifice multi-port has at least two upper exhaust ports, at least one of which is connected to a gas pipeline, and the other upper exhaust ports are connected to a gas-water separator.

10. The blowout preventer system according to claim 9, characterized in that: The diameter of the lower outlet is larger than the diameter of the upper outlet.

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