Oil gas discharge pipe

Abstract

The utility model relates to the technical field of oil gas discharge pipelines, in particular to an oil gas discharge pipe. The oil gas discharge pipe comprises a pipe body, the inlet end of the pipe body is lower than the outlet end of the pipe body, a plurality of flow guide through holes are formed in the side face, close to the inlet end of the pipe body, of the pipe body, and the inlet end of the pipe body is communicated with a second flow guide piece used for flow guide. The sectional area of one end, close to the pipe body, of the second flow guide piece is smaller than that of the other end. By arranging the second flow guide part, enlarging the sectional area of the inlet end of the oil gas discharge pipe, reducing the overall flow rate of gas, further reducing the pressure drop degree and reducing oil gas loss, and by arranging the plurality of flow guide through holes, gas enters the pipe body from the plurality of flow guide through holes, a boundary layer formed by gas flow in the pipe body can be destroyed, and the oil gas loss is reduced. The flow rate of gas near the side wall is increased, and when the average gas speed on the whole pipeline section is not changed, the gas speed in the center can be reduced, so that the local pressure drop is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas discharge pipelines, in particular to an oil and gas discharge pipe. Background Art

[0002] Large underground oil storage caverns include caverns and shafts. The caverns are used to store oil, and the shafts are equipped with oil inlet pipes and oil and gas exhaust pipes. When the oil is first taken in, it is first necessary to replace it with nitrogen. Nitrogen is injected through the oil inlet pipe to replace the air in the cavern. The replaced gas is discharged through the oil and gas exhaust pipe, and then the original air in the cavern is discharged to avoid the formation of an explosive mixture between the volatilized oil and oxygen in the air after the oil is taken in.

[0003] The existing oil and gas discharge pipe is installed in the vertical shaft, and comprises a pipe body, wherein the pipe body has an outlet end and an inlet end, and the diameter of the outlet end is the same as the diameter of the inlet end.

[0004] When oil is fed into the cave tank through the oil inlet pipe, the large amount of oil and high speed will cause the oil and gas to enter the gas phase space from the liquid phase space. The oil and gas in the cave tank will enter the oil and gas discharge pipe through the inlet end of the oil and gas discharge pipe, and then be discharged from the outlet end. However, due to the excessively high gas flow rate in the pipe body of the existing oil and gas discharge pipe or the excessively high liquid level in the cave tank and the small gas flow cross-sectional area resulting in poor gas flow, it is very easy to cause low local pressure at the inlet end of the oil and gas discharge pipe, aggravating the volatilization of crude oil and causing oil and gas loss. Utility Model Content

[0005] (I) The problem to be solved by the present invention is: how to reduce the volatilization of crude oil and reduce the loss of oil and gas.

[0006] (II) Technical solution

[0007] The utility model provides an oil and gas discharge pipe, comprising a pipe body, wherein the inlet end of the pipe body is lower than the outlet end thereof, a plurality of guide holes are provided on the side of the pipe body close to the inlet end thereof, the inlet end of the pipe body is connected to a second guide member for guiding flow, and the cross-sectional area of ​​the second guide member close to one end of the pipe body is smaller than the cross-sectional area of ​​the other end.

[0008] According to an embodiment of the utility model, a first flow guide is sleeved on the side of the tube body close to its inlet end, the first flow guide is arranged above the second flow guide, and the plurality of flow guide holes are arranged between the first flow guide and the second flow guide.

[0009] According to an embodiment of the present invention, a cross-sectional area of ​​one end of the first flow guide member close to the second flow guide member is larger than that of the other end.

[0010] According to an embodiment of the present utility model, the first flow guide is a first conical ring plate, and the radius of one end of the first conical ring plate close to the second flow guide is 1.2-3 times the radius of the other end thereof.

[0011] According to an embodiment of the present invention, the second flow guide is a second conical ring plate, and the radius of the second conical ring plate away from one end of the tube body is 1.2-3 times the radius of the other end thereof.

[0012] According to an embodiment of the present invention, the plurality of flow-conducting holes are evenly arranged around the axial direction of the tube body.

[0013] According to an embodiment of the present invention, one end of the flow guide hole close to the axis of the tube body is higher than the other end thereof.

[0014] According to an embodiment of the present utility model, a plurality of the first flow guide members are provided, and the plurality of the first flow guide members are arranged in sequence along the length direction of the tube body, and a plurality of the flow guide holes are provided between each two adjacent first flow guide members.

[0015] According to an embodiment of the utility model, the distance between the first flow guide member and the second flow guide member is between one third and one fifth of the diameter of the tube body, and the distance between the first flow guide member and the second flow guide member is greater than the size of the guide hole.

[0016] According to an embodiment of the present utility model, the flow-conducting hole is a circular through hole, and the axis of the circular through hole is perpendicular to the axis of the tube body.

[0017] Beneficial effects of the utility model:

[0018] By setting a second flow guide, the cross-sectional area at the inlet end of the oil and gas discharge pipe is enlarged, so that the gas flow cross-sectional area is increased, the overall gas flow rate is reduced, and then the degree of pressure drop is reduced. At this time, the pressure is less affected, so that oil and gas volatilization is reduced, and oil and gas loss is reduced. Since the gas flow rate at the center of the oil and gas discharge pipe is significantly different from the flow rate at the pipe wall, the gas enters the pipe body through the multiple flow guide holes, which can destroy the boundary layer formed by the airflow in the pipe body. By introducing airflows in different directions, the gas flow rate near the side wall is increased. When the average gas velocity on the entire pipe cross section remains unchanged, the gas velocity at the center can be reduced, thereby reducing the local pressure drop, further reducing oil and gas volatilization, and reducing oil and gas loss.

[0019] By setting a second guide member and increasing the cross-sectional area of ​​the inlet end of the oil and gas discharge pipe, the occurrence of flash evaporation caused by the small gas flow cross-sectional area due to the high liquid level in the cave tank can be reduced. The second guide member and multiple guide holes can guide the gas in other areas into the pipe body, so that enough gas can be gathered at the inlet end of the oil and gas discharge pipe, so that the inlet end of the oil and gas discharge pipe will not have too low local pressure at the inlet end due to insufficient gas replenishment, thereby reducing the occurrence of flash evaporation and reducing oil and gas loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A three-dimensional diagram provided for an embodiment of the utility model;

[0022] Figure 2 A cross-sectional view provided for an embodiment of the utility model.

[0023] Icons: 1. Tube body; 2. Diversion hole; 3. First flow guide member; 4. Second flow guide member. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1-Figure 2 As shown, an embodiment of the utility model provides an oil and gas discharge pipe, including a pipe body 1, the pipe body 1 having an inlet end and an outlet end, the inlet end of the pipe body 1 is lower than the outlet end, a plurality of guide holes 2 are provided on the side of the pipe body 1 near the inlet end, a second guide member 4 for guiding flow is connected at the inlet end of the pipe body 1, one end of the second guide member 4 is fixedly connected to the inlet end of the pipe body 1, and the cross-sectional area of ​​the second guide member 4 near one end of the pipe body 1 is smaller than the cross-sectional area of ​​the other end.

[0026] By setting a second flow guide 4 fixedly connected to the inlet end of the pipe body 1, the cross-sectional area at the inlet end of the oil and gas discharge pipe is enlarged, so that the gas flow cross-sectional area is increased, the overall gas flow rate is reduced, and the degree of pressure drop is reduced. At this time, the pressure is less affected, so that oil and gas volatilization is reduced, and oil and gas loss is reduced. Since the gas flow velocity at the center of the oil and gas discharge pipe is greatly different from the flow velocity at the pipe wall, the gas enters the pipe body 1 through the multiple flow guide holes 2 through the multiple flow guide holes 2, which can destroy the boundary layer formed by the airflow in the pipe body 1. By introducing airflows in different directions, the gas flow rate near the side wall is increased. When the average gas velocity on the entire cross section of the pipe body 1 remains unchanged, the gas velocity at the center can be reduced, thereby reducing the local pressure drop, further reducing oil and gas volatilization, and reducing oil and gas loss.

[0027] As the volatilization of oil and gas is reduced, the concentration of oil and gas is reduced, and the processing capacity of the oil and gas recovery device is reduced.

[0028] The oil and gas discharge pipe has a simple structure, is safe and reliable, and avoids the risk of overpressure in the cave tank due to equipment failure.

[0029] In addition, when the oil level in the cave tank is high and the flow cross-section of the gas in the cave tank is small, the flow space of the gas is small, so the gas circulation is not smooth, resulting in the inlet end of the oil and gas discharge pipe The gas cannot be replenished in time, resulting in too low local pressure at the inlet end, which leads to flash evaporation, causing the oil and gas to volatilize more. In this embodiment, according to the Bernoulli equation, every doubling of the cross-section of the inlet end of the oil and gas discharge pipe can reduce the pressure difference by three quarters. Therefore, it is feasible to reduce flash evaporation by increasing the inlet cross-sectional area. In this embodiment, by setting a second guide member 4, the cross-sectional area of ​​the inlet end of the oil and gas discharge pipe is increased, which can reduce the occurrence of flash evaporation caused by the high liquid level in the cave tank and the small gas flow cross-sectional area. Due to the second guide member 4 and the multiple guide holes 2, the gas in other areas can be diverted into the pipe body 1, so that enough gas can be gathered at the inlet end of the oil and gas discharge pipe, so that the inlet end of the oil and gas discharge pipe will not cause the local pressure at the inlet end to be too low due to insufficient gas replenishment, thereby reducing the occurrence of flash evaporation and reducing oil and gas losses.

[0030] It should be noted that the end of the second flow guide 4 away from the pipe body 1 is the inlet end of the oil and gas discharge pipe, and the outlet end of the pipe body 1 is the outlet end of the oil and gas discharge pipe.

[0031] Since traditional nitrogen injection is done through the oil inlet pipe, the gas in the cavern is discharged through the oil and gas discharge pipe. Both the oil inlet pipe and the oil and gas discharge pipe are arranged in the vertical shaft. The oil inlet pipe and the oil and gas discharge pipe are close to each other, so the injected nitrogen is easily discharged from the oil and gas discharge pipe before it flows downward to fully replace the air inside the cavern, thus affecting the effect of nitrogen replacement.

[0032] In this embodiment, when nitrogen is injected, the nitrogen enters the cavity tank through the oil inlet pipe, diffuses to the surroundings and replaces the air in the cavity tank. Since the second guide member 4 is provided to expand the gas flow cross-sectional area at the inlet end of the oil and gas exhaust pipe, the pipe body 1 can introduce air from other positions in the cavity tank, thereby reducing the situation where nitrogen is directly sucked into the oil and gas exhaust pipe after flowing out of the oil inlet pipe, thereby improving the efficiency of nitrogen replacement.

[0033] As a specific embodiment, the second flow guide 4 is a second conical ring plate, and the radius of the second conical ring plate at one end away from the tube body 1 is 1.2-3 times the radius of the other end thereof.

[0034] like Figure 2 As shown, the second guide member 4 is a second conical ring plate, and preferably the radius of the second conical ring plate away from the end of the pipe body 1 is 3 times the radius of the other end thereof, thereby expanding the cross-sectional area of ​​the inlet end of the oil and gas discharge pipe and reducing the flash phenomenon caused by the local low pressure at the inlet end.

[0035] Furthermore, the wall thickness of the second flow guide member 4 gradually decreases from one end close to the tube body 1 to the other end. Without affecting the strength of the second flow guide member 4, the smaller the wall thickness of the second flow guide member 4 at the end away from the tube body 1, the better the gas guide effect.

[0036] The second guide member 4 can also be in other forms, for example, the second guide member 4 is composed of a third conical ring plate and a fourth conical ring plate, the first end of the third conical ring plate is fixedly connected to the tube body 1, and the second end thereof is fixedly connected to the first end of the fourth conical ring plate, and the radius of the second end of the third conical ring plate is the same as the radius of the first end of the fourth conical ring plate, wherein the radius of the first end of the third conical ring plate, the radius of the second end of the third conical ring plate and the radius of the second end of the fourth conical ring plate increase successively, that is, the gas flow cross-sectional area of ​​the fourth conical ring plate is larger than the gas flow cross-sectional area of ​​the third conical ring plate, and the gas flow cross-sectional area of ​​the third conical ring plate is larger than the gas flow cross-sectional area in the tube body 1.

[0037] As a specific embodiment, a first flow guide 3 is sleeved on the outer side surface of the tube body 1 near its inlet end, the first flow guide 3 is arranged above the second flow guide 4, a plurality of flow guide holes 2 are arranged between the first flow guide 3 and the second flow guide 4, and the first flow guide 3 is fixedly connected to the side surface of the tube body 1.

[0038] The upper gas flow in the cave tank can be introduced by the first flow guide 3. Due to the different densities of the gas in the cave tank, relatively light components such as nitrogen are located in the upper part, and heavier oil and gas are located in the lower part. By introducing the lighter upper gas, the discharge of the lower oil and gas from the cave tank is reduced, thereby reducing the loss of oil and gas.

[0039] The cross-sectional area of ​​one end of the first flow guide 3 close to the second flow guide 4 is larger than that of the other end. Setting the cross-sectional area of ​​one end of the first flow guide 3 close to the second flow guide 4 is larger than that of the other end to avoid the airflow from being deflected and causing pressure drop.

[0040] As a specific embodiment, the first flow guide member 3 is a first conical ring plate, and the radius of one end of the first conical ring plate close to the second flow guide member 4 is 1.2-3 times the radius of the other end thereof.

[0041] like Figure 2 As shown, one end of the first conical ring plate fixedly connected to the side wall of the tube body 1 is the end away from the second flow guide 4. The first conical ring plate is preferably used so that the radius of the end of the conical ring plate away from the second flow guide 4 is 3 times the radius of the other end.

[0042] As a specific embodiment, a plurality of first flow guide members 3 are provided, and the plurality of first flow guide members 3 are arranged in sequence along the length direction of the tube body 1 , and a plurality of flow guide holes 2 are provided between each two adjacent first flow guide members 3 .

[0043] Furthermore, two first flow guide members 3 are provided, and the two first flow guide members 3 are arranged in sequence along the length direction of the tube body 1 , and are both fixedly connected to the tube body 1 .

[0044] A plurality of guide holes 2 are also provided between the two first guide members 3. By directing the gas in the hole tank to the guide holes 2, the boundary layer formed by the airflow in the tube body 1 is destroyed, and the gas flow velocity near the side wall is increased. When the average gas velocity on the cross section of the entire tube body 1 remains unchanged, the gas velocity at the center can be reduced, thereby reducing the local pressure drop, further reducing the volatilization of oil and gas, and reducing the oil and gas loss.

[0045] Furthermore, a plurality of guide grooves are provided on the inner side surface of the first conical ring plate. The guide grooves are strip-shaped and correspond one to one with the guide holes 2. The width of the guide grooves near one end of the guide hole 2 is smaller than that of the other end, thereby enabling the gas to be better introduced into the guide hole 2.

[0046] Of course, the first flow guide member 3 can also be a plurality of arc plates, which are evenly arranged around the axis of the tube body 1, with the arc center of each arc plate facing the second flow guide member 4, and the plurality of arc plates partially overlap at one end close to the tube body 1, and the length direction of each arc plate intersects with the axial direction of the tube body 1, which can also serve the purpose of guiding the gas into the guide hole 2. Its purpose does not deviate from the design concept of the present utility model, and therefore, should belong to the protection scope of the present utility model.

[0047] As a specific embodiment, the distance between the first flow guide 3 and the second flow guide 4 is between one third and one fifth of the diameter of the tube body 1 , and the distance between the first flow guide 3 and the second flow guide 4 is greater than the size of the guide hole 2 .

[0048] It should be further explained that the distance between the first flow guide 3 and the second flow guide 4 is recorded as the first distance, which is one quarter of the diameter of the tube body 1, and the aperture of the opened flow guide hole 2 is smaller than the first distance.

[0049] Furthermore, one end of the first conical ring plate close to the outlet end of the tube body 1 is recorded as the first end, and the other end is recorded as the second end; one end of the second conical ring plate close to the outlet end of the tube body 1 is recorded as the third end, and the other end is recorded as the fourth end. The diameter of the first end is equal to the diameter of the third end. Preferably, the diameter of the second end is equal to the diameter of the fourth end, that is, the sizes of the first conical ring plate and the second conical ring plate are exactly the same. Optionally, the diameter of the second end is larger than the diameter of the fourth end.

[0050] It should be noted that the diameter of the second end is greater than the diameter of the first end, and the diameter of the fourth end is greater than the diameter of the third end.

[0051] As a specific embodiment, the plurality of flow-conducting holes 2 are evenly arranged around the axial direction of the tube body 1 .

[0052] The plurality of flow-conducting holes 2 are evenly arranged around the axis of the tube body 1, so that the gas around the bottom of the tube body 1 can be evenly poured in, so that more nitrogen in the upper layer can be extracted, reducing oil and gas loss.

[0053] As a specific embodiment, one end of the flow guide hole 2 close to the axis of the tube body 1 is higher than the other end thereof.

[0054] By opening the guide hole 2 on the tube body 1 at an angle toward the gas outlet end of the tube body 1 , the gas poured into the guide hole 2 can flow more smoothly, and the guide effect and the effect of destroying the boundary layer formed in the tube body 1 are better.

[0055] Of course, in this embodiment, the flow-conducting hole 2 is a circular through hole, and the axis of the circular through hole is perpendicular to the axis of the tube body 1 .

[0056] Such a design method can reduce the difficulty in machining the flow-conducting hole 2 , has low requirements on machining technology, and saves costs.

[0057] In this embodiment, the cross-sectional area of ​​the tube body 1 , the cross-sectional area of ​​the first flow guide 3 , and the cross-sectional area of ​​the second flow guide 4 all refer to the area in the direction perpendicular to the axis of the tube body 1 .

[0058] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil and gas discharge pipe, characterized in that: The invention comprises a tube body (1), wherein the inlet end of the tube body (1) is lower than the outlet end thereof, a plurality of flow guide holes (2) are provided on the side of the tube body (1) close to the inlet end thereof, the inlet end of the tube body (1) is connected to a second flow guide member (4) for guiding flow, and the cross-sectional area of ​​the second flow guide member (4) close to one end of the tube body (1) is smaller than the cross-sectional area of ​​the other end thereof.

2. The oil and gas discharge pipe according to claim 1, characterized in that: A first flow guide (3) is sleeved on the side surface of the tube body (1) close to its inlet end; the first flow guide (3) is arranged above the second flow guide (4); and the plurality of flow guide holes (2) are arranged between the first flow guide (3) and the second flow guide (4).

3. The oil and gas discharge pipe according to claim 2, characterized in that: The cross-sectional area of ​​one end of the first flow guide (3) close to the second flow guide (4) is larger than that of the other end.

4. The oil and gas discharge pipe according to claim 3, characterized in that: The first flow guide (3) is a first conical ring plate, and the radius of one end of the first conical ring plate close to the second flow guide (4) is 1.2-3 times the radius of the other end thereof.

5. The oil and gas discharge pipe according to claim 1, characterized in that: The second flow guide (4) is a second conical ring plate, and the radius of the second conical ring plate at one end away from the tube body (1) is 1.2 to 3 times the radius of the other end thereof.

6. The oil and gas discharge pipe according to claim 1, characterized in that: The plurality of flow-conducting holes (2) are evenly arranged around the axial direction of the tube body (1).

7. The oil and gas discharge pipe according to claim 1, characterized in that: One end of the flow guide hole (2) close to the axis of the tube body (1) is higher than the other end.

8. The oil and gas discharge pipe according to claim 2, characterized in that: A plurality of the first flow guide members (3) are provided, and the plurality of the first flow guide members (3) are arranged in sequence along the length direction of the tube body (1), and a plurality of the flow guide holes (2) are provided between each two adjacent first flow guide members (3).

9. The oil and gas discharge pipe according to claim 2, characterized in that: The distance between the first flow guide member (3) and the second flow guide member (4) is between one third and one fifth of the diameter of the tube body (1), and the distance between the first flow guide member (3) and the second flow guide member (4) is greater than the size of the flow guide hole (2).

10. The oil and gas discharge pipe according to claim 1, characterized in that: The flow-conducting hole (2) is a circular through hole, and the axis of the circular through hole is perpendicular to the axis of the tube body (1).

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