CN115930107A - Negative pressure slow release method and device for oil inlet vertical pipe of underground water sealed cave depot - Google Patents
Negative pressure slow release method and device for oil inlet vertical pipe of underground water sealed cave depot Download PDFInfo
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- 230000008569 process Effects 0.000 claims abstract description 17
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- 239000003381 stabilizer Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 6
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- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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- 238000000889 atomisation Methods 0.000 description 1
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of underground water-sealed cave depots, in particular to a negative-pressure slow-release method and device for an oil inlet vertical pipe of an underground water-sealed cave depot. The method comprises the following steps: s1: oil is conveyed into the main cavern through the oil inlet vertical pipe; s2: measuring a pressure value Pj at the top of the oil inlet vertical pipe in the process of conveying oil into the main cavern; and when the Pj is smaller than a first preset value P2, oil gas in the main cavity is conveyed to the top of the oil inlet vertical pipe through an oil gas pipeline. According to the method, the oil-gas pipeline of the cavern is connected to the top of the oil inlet vertical pipe in a spanning mode, and the oil inlet working condition of controllable gas-liquid two-phase flow is formed in the oil inlet vertical pipe, so that the negative pressure in the oil inlet vertical pipe is compensated by using the oil gas dispersed in the main cavern. The method has the advantages of being good in slow release effect, high in safety, ecological, environment-friendly, energy-saving, consumption-reducing and the like, and effectively avoids potential engineering accidents such as pipeline vibration or falling of anchoring piers.
Description
Technical Field
The invention relates to the technical field of underground water-sealed cave depots, in particular to a negative-pressure slow-release method and device for an oil inlet vertical pipe of an underground water-sealed cave depot.
Background
The oil storage of the underground water seal cave depot has been rapidly developed in recent years due to the advantages of high safety, low manufacturing cost, small environmental pollution, large reserve capacity and the like, and becomes the preferred mode of the current oil storage. The fall of an oil inlet vertical pipe of the underground water-sealed cave depot is usually more than 100 meters, the potential energy of fluid is far larger than the resistance drop of a pipeline in the oil injection process, and the residual energy causes the oil phase to break, so that the oil phase flows beyond the full diameter and forms a negative pressure state. In the prior art, the negative pressure of the oil inlet vertical pipe is slowly released by increasing a pore plate to limit the flow velocity of fluid or reducing the diameter of a pipeline so as to improve the resistance drop of the pipeline. However, the orifice plate causes the local flow velocity to increase, causes transient change of pressure in the pipe, forms a negative pressure state again, or reaches the saturated vapor pressure of crude oil at the conveying temperature, causes gas to separate out, forms complex gas-liquid stirring flow, has huge impact effect on the pipeline, and can cause engineering accidents such as pipeline vibration or tearing, anchor pier falling and the like in serious cases; the mode of pipeline reducing only has certain effect on the designed flow working condition, but can not meet the requirement of negative pressure slow release in the pipe under the variable flow working condition.
The negative pressure controlled slow release control technology of the vertical shaft oil inlet pipeline of the cave depot at the present stage is not overcome at home, so that how to slowly release the negative pressure in the oil inlet vertical pipe of the underground water seal cave depot becomes a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The first purpose of the present invention is to provide a method for slowly releasing the oil inlet riser negative pressure in an underground water sealed cavern.
In order to achieve the purpose, the invention adopts the following technical scheme:
a negative pressure slow release method for an oil inlet riser of an underground water sealed cave depot comprises the following steps:
s1: conveying oil into the main cavity through the oil inlet vertical pipe;
s2: measuring a pressure value Pj at the top of the oil inlet vertical pipe in the process of conveying oil into the main cavern;
and when the Pj is smaller than a first preset value P2, oil gas in the main cavity is conveyed to the top of the oil inlet vertical pipe through an oil gas pipeline.
Further, in step S2, after the oil gas enters the top of the oil inlet riser, the oil gas ratio in the oil inlet riser is in the range of 17.
Further, in step S2, oil gas is controlled to enter the oil inlet vertical pipe at a set speed through the flow stabilizing device.
Further, step S1 includes:
conveying oil to an inlet of an oil inlet vertical pipe through an oil inlet pipeline, and measuring a pressure value Pi at the tail end of the oil inlet pipeline;
when Pi is within a preset range, oil in the oil pipeline is conveyed into the oil inlet vertical pipe, and the oil is conveyed into the main cavity through the oil inlet vertical pipe.
Further, in step S1, when Pi is smaller than a second preset value P1, the supercharging device is turned on to adjust Pi to be within a preset range.
Further, in step S1, when Pi is greater than a second preset value P1, the pressure regulating valve is opened to regulate Pi to be within a preset range.
Further, in the process of conveying oil into the main cavity through the oil inlet vertical pipe, pj is dynamically close to Pi.
Further, in the step S1 and/or the step S2, a flow-limiting perforated plate is arranged in the oil inlet vertical pipe, and the flow-limiting perforated plate is located at the lower end of the oil inlet vertical pipe and is perpendicular to the axis of the oil inlet vertical pipe;
and the oil inlet vertical pipe is positioned on the pipe wall between the flow-limiting porous plate and the oil interface in the main cavern, and oil gas in the main cavern enters the oil inlet vertical pipe through the air inlet.
The second purpose of the invention is to provide a negative pressure slow release device for the oil inlet riser of the underground water sealed cavern, aiming at the technical problems existing in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the negative pressure slow release device for the oil inlet stand pipe of the underground water seal cavern is used for realizing the negative pressure slow release method for the oil inlet stand pipe of the underground water seal cavern, and comprises a main cavern, the oil inlet stand pipe and an oil-gas pipeline, wherein the lower ends of the oil inlet stand pipe and the oil-gas pipeline are communicated with the main cavern, and the upper end of the oil-gas pipeline is communicated with the upper end of the oil inlet stand pipe;
the oil inlet riser top is provided with first pressure monitoring sensor, be provided with flow control valve on the oil gas pipeline, flow control valve can be according to the automatic switching of pressure value that first pressure monitoring sensor detected.
Furthermore, a flow-limiting perforated plate is arranged in the oil inlet vertical pipe, is positioned at the lower end of the oil inlet vertical pipe and is vertical to the axis of the oil inlet vertical pipe;
and the oil inlet vertical pipe is provided with an air inlet hole on the pipe wall between the flow-limiting porous plate and the oil interface in the main chamber.
The invention has the beneficial effects that:
the invention provides a negative pressure slow release method and a negative pressure slow release device for an oil inlet riser of an underground water seal cave depot, wherein the method comprises the following steps of:
s1: oil is conveyed into the main cavern through the oil inlet vertical pipe;
s2: measuring a pressure value Pj at the top of the oil inlet vertical pipe in the process of conveying oil into the main cavern;
and when the Pj is smaller than a first preset value P2, oil gas in the main cavity is conveyed to the top of the oil inlet vertical pipe through an oil gas pipeline.
According to the method, the oil-gas pipeline of the cavern is connected to the top of the oil inlet vertical pipe in a spanning mode, and the oil inlet working condition of controllable gas-liquid two-phase flow is formed in the oil inlet vertical pipe, so that the negative pressure in the oil inlet vertical pipe is compensated by using the oil gas dispersed in the main cavern. Compared with the mode that the flow velocity of fluid is limited by the aid of the pore plates or the diameter of the pipeline is reduced to improve resistance drop of the pipeline, negative pressure of the oil inlet vertical pipe is slowly released, the method provided by the application can make full use of existing conditions, and has the advantages of being good in slow release effect, high in safety, ecological, environment-friendly, energy-saving, consumption-reducing and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic process flow diagram of a negative pressure slow release method for an oil inlet riser of an underground water seal cavern provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of an oil inlet riser negative pressure slow release device of an underground water seal cavern provided by the second embodiment of the invention;
fig. 3 is a schematic structural diagram of a position of an air inlet hole in an oil inlet riser negative pressure slow release device of an underground water seal cavern provided by the second embodiment of the invention.
Icon:
1-an oil inlet vertical pipe; 11-a flow-restricting perforated plate; 12-inlet ports; 13-a first pressure monitoring sensor;
2-a main chamber;
3-oil and gas pipelines; 31-a flow stabilizer; 32-a flow regulating valve;
4-an oil supply pipeline; 41-a supercharging device; 42-pressure regulating valve; 43-a second pressure monitoring sensor; 44-a third pressure monitoring sensor;
5-oil inlet vertical shaft; 51-a sealing plug;
6-oil outlet vertical shaft; 61-temperature detection sleeve; 62-crude oil casing; 63-a boundary position detection sleeve pipe group; 64-liquid level measuring sleeve set; 65-oil and gas casing;
71-a terrace surface; 72-water top layer; 73-bentonite layer; 74-oil water interface.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should be noted that, in the description of the present invention, the terms "connected" and "mounted" should be interpreted broadly, for example, they may be fixedly connected, detachably connected, or integrally connected; can be directly connected or connected through an intermediate medium; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example one
The embodiment provides a negative pressure slow release method for an oil inlet riser 1 of an underground water seal cave depot, which comprises the following steps of:
s1: oil is conveyed into a main chamber 2 through an oil inlet vertical pipe 1;
s2: measuring a pressure value Pj at the top of the oil inlet vertical pipe 1 in the process of conveying oil into the main cavern 2;
when Pj is smaller than a first preset value P2, oil and gas in the main chamber 2 are conveyed to the top of the oil inlet stand pipe 1 through the oil and gas pipeline 3.
According to the method, an oil-gas pipeline 3 of the cavern is bridged into the top of the oil inlet vertical pipe 1, and an oil inlet working condition of controllable gas-liquid two-phase flow is formed in the oil inlet vertical pipe 1, so that negative pressure in the oil inlet vertical pipe 1 is compensated by oil gas dispersed in the main cavern 2. Compared with the mode that the flow velocity of fluid is limited by the aid of the pore plates or the diameter of the pipeline is reduced to improve resistance drop of the pipeline in the prior art, negative pressure of the oil inlet vertical pipe 1 is slowly released, the method provided by the application can make full use of existing conditions, and has the advantages of being good in slow release effect, high in safety, ecological, environment-friendly, energy-saving, consumption-reducing and the like.
The step S1 comprises the following steps:
oil is conveyed to the inlet of the oil inlet vertical pipe 1 through the oil inlet pipeline 4, and a pressure value Pi at the tail end of the oil inlet pipeline 4 is measured;
when Pi is within a preset range, oil in the oil pipeline 4 is conveyed into the oil inlet vertical pipe 1, and the oil is conveyed into the main cavern 2 through the oil inlet vertical pipe 1.
In step S1, when Pi is smaller than the second preset value P1, the supercharging device 41 is turned on to adjust Pi to be within a preset range. When Pi is greater than the second preset value P1, the pressure regulating valve 42 is opened to regulate Pi to be within a preset range.
The supercharging device 41 functions as: when the incoming flow liquid does not reach a specified threshold value, pressurization is performed by the pressurization device 41, and simultaneously air existing in the incoming flow is emptied. In this embodiment, the supercharging device 41 includes a booster pump; when the pressure value Pi at the tail end of the oil inlet pipeline 4 does not reach the set range, the pressure of the oil at the tail end of the oil inlet pipeline 4 is regulated by the booster pump.
The pressure regulating valve 42 functions to: when the incoming fluid exceeds a specified threshold, pressure is reduced by the pressure regulating valve 42.
The method comprises the following steps: when Pi is smaller than the second preset value P1, the supercharging device 41 is turned on to adjust Pi to be within the preset range, including the steps of:
when Pi is smaller than a second preset value P1, the supercharging device 41 is turned on;
it is detected whether the pressure value of the liquid flowing out from the pressurizing means 41 is within a preset range.
Or, the step: when Pi is greater than the second preset value P1, the pressure regulating valve 42 is opened to regulate Pi to be within the preset range, including the steps of:
when Pi is greater than a second preset value P1, the pressure regulating valve 42 is opened;
it is detected whether the pressure value of the liquid flowing out of the pressure regulating valve 42 is within a preset range.
In the present embodiment, pi is maintained to fluctuate within a range P1 to P1+ dP, where dP is a preset pressure compensation value, by the pressure increasing device 41 and the pressure regulating valve 42.
According to the oil inlet vertical pipe, the pressure value of oil at the tail end of the oil inlet pipeline 4 is controlled, the pressure of the oil entering the oil inlet vertical pipe 1 can be controlled, the oil enters the oil inlet vertical pipe 1 through the stable pressure value, and the generation of negative pressure at the top of the oil inlet vertical pipe 1 is relieved.
Further, in step S2, after the oil gas enters the top of the oil inlet riser 1, the oil gas ratio in the oil inlet riser 1 is controlled within a range of 17. In the range of the oil-gas ratio, the stable flow of the gas-liquid two-phase flow can be ensured. If the gas-oil ratio is lower than or higher than the range, the negative pressure in the oil inlet vertical pipe 1 cannot be sufficiently slowly released, or the gas-liquid two-phase flow is unstable, so that the pipeline is easily impacted.
In the embodiment, oil gas is controlled to enter the oil inlet riser 1 at a set speed through the flow stabilizing device 31, so that the oil gas ratio in the oil inlet riser 1 is controlled to be maintained in a range of 17.
The oil-gas ratio is specifically the oil volume in the oil inlet vertical pipe 1: volume of oil and gas. Because the pipe diameters of the pipelines (including the oil inlet stand pipe 1, the oil-gas pipeline 3 and the oil inlet pipeline 4) are known data, the oil-gas ratio in the oil inlet stand pipe 1 can be obtained through the oil liquid speed and the oil-gas speed entering the oil inlet stand pipe 1; therefore, the oil-gas ratio can be maintained in a proper range by controlling the speed of the oil liquid and the oil gas entering the oil inlet vertical pipe 1 or controlling the speed of the oil gas entering the oil inlet vertical pipe 1 according to the speed of the oil liquid entering the oil inlet vertical pipe 1.
In the embodiment, the oil flow entering the oil inlet stand pipe 1 is a fixed value, the oil gas can be controlled to enter the oil inlet stand pipe 1 by sizing the oil gas pipeline 3 and controlling the speed of the oil gas entering the oil inlet stand pipe 1, and the volume ratio of the oil to the gas is in a proper range.
The flow stabilizer 31 functions as: oil gas dispersed in the main cavern 2 is driven by pressure in the main cavern 2 to freely flow in a direction far away from the main cavern 2 through an oil gas pipeline 3, and in the flowing process, the flow velocity and the flow state of the oil gas have great uncertainty; therefore, when negative pressure is generated in the oil inlet stand pipe 1 and needs to be compensated, the phenomenon that oil gas is instantly and greatly gushed into the oil inlet stand pipe 1 under the action of the negative pressure to cause that gas-liquid two-phase flow cannot stably flow is avoided, and the flow stabilizing device 31 is used for controlling the flow speed and the flow state of the oil gas entering the oil inlet stand pipe 1, so that the oil gas enters a negative pressure area in the oil inlet stand pipe 1 in a smooth and stable state.
Optionally, the flow stabilizer 31 includes a flow stabilizer valve, a cross-flow fan, a pressure gauge, and a flow meter; the working principle is as follows: after the pressure of the oil gas is controlled to be stable by the flow stabilizing valve, the oil gas flows out stably by the cross-flow fan. Through the flow stabilizer 31, no matter what the oil gas pressure in the oil gas pipeline 3 is, the oil gas flows out at the set pressure and flow rate after passing through the flow stabilizer 31.
The specific structures of the gas flow stabilizing valve and the cross-flow fan are the prior art and are not described again. The pressure meter and the flowmeter are used for facilitating the checking of workers, and the specific structure of the pressure meter and the flowmeter is also the prior art and is not described in detail herein.
In the embodiment, the flow stabilizer 31 is used for maintaining the fluctuation of the speed V1 of oil gas entering the oil inlet vertical pipe 1 within the range of V0-V0 + dv; v0 is a preset speed value of oil gas entering the oil inlet vertical pipe 1, and dv is a set speed compensation value.
In the process of conveying oil into the main chamber 2 through the oil inlet vertical pipe 1, pj and Pi are dynamically close to each other. Under the stable working condition, the dynamic approaching of the Pj value and the Pi value is controlled by controlling the flow speed and the flow state of oil gas entering the oil inlet vertical pipe 1, and the slow release of the negative pressure in the oil inlet vertical pipe 1 is ensured. That is, the value of Pj is also within the range P1 to P1+ dP.
In the step S1 and/or the step S2, a flow-limiting perforated plate 11 is arranged in the oil inlet vertical pipe 1, and the flow-limiting perforated plate 11 is positioned at the lower end of the oil inlet vertical pipe 1 and is vertical to the axis of the oil inlet vertical pipe 1; an air inlet hole 12 is formed in the pipe wall of the oil inlet vertical pipe 1, which is positioned between the flow-limiting porous plate 11 and an oil interface in the main chamber 2, and oil gas in the main chamber 2 enters the oil inlet vertical pipe 1 through the air inlet hole 12.
In the process of feeding oil into the oil inlet vertical pipe 1, as the falling flow rate of the oil is larger, the atomization phenomenon is more easily generated, therefore, a flow-limiting porous plate 11 is usually arranged in the oil inlet vertical pipe 1 to limit the flow rate of the oil entering the main chamber 2. The flow-limiting porous plate 11 will increase the flow velocity of the oil liquid at the lower part of the flow-limiting porous plate 11, and cause the transient change of the pressure in the pipe, and form a negative pressure state again. In this application, because oil feed riser 1 is provided with inlet port 12 on being located the pipe wall between the oil interface in flow-limiting perforated plate 11 and the main cavern 2, the oil feed in-process local negative pressure zone in 11 low reaches positions of flow-limiting perforated plate can be through the oil gas of diffusion in the main cavern 2 of inlet port 12 free respiration to automatic compensate 11 low reaches local negative pressure zones of flow-limiting perforated plate, ensure the stability of the process of throwing oil.
The method according to the invention is explained below on the basis of specific engineering examples:
referring to fig. 1 and 2, the underground water-sealed cavern system comprises a main cavern 2, an oil inlet pipeline 4, an oil inlet shaft 5 and an oil outlet shaft 6, wherein the lower ends of the oil inlet shaft 5 and the oil outlet shaft 6 are communicated with the main cavern 2. The oil inlet shaft 5 (and/or the oil outlet shaft 6) and the main cavern 2 are sequentially a terrace surface 71, a water top layer 72, a bentonite layer 73 and an oil-water interface 74 from the ground to the bottom end of the main cavern 2.
An oil inlet riser 1 is arranged in the oil inlet shaft 5, and a sealing plug 51 for sealing is arranged between the inner wall surface of the oil inlet shaft 5 and the outer wall surface of the oil inlet riser 1. Be provided with in the shaft 6 that produces oil and be used for measuring the temperature detection sleeve pipe 61 of the interior oil temperature of main cavern 2, a crude oil sleeve pipe 62 that is used for fluid to flow out, a boundary position detection sleeve pipe group 63 that is used for detecting the interior fluid boundary position of main cavern 2, a liquid level measurement sleeve pipe group 64 that is used for detecting the interior fluid level of main cavern 2 and be used for the oil gas sleeve pipe 65 that oil gas flows out, wherein, oil gas pipeline 3 communicates in oil gas sleeve pipe 65, oil gas in the main cavern 2 can flow to in the oil feed riser 1 along oil gas pipeline 3 and oil gas sleeve pipe 65.
The tail end of the oil inlet pipeline 4 is communicated with an opening above the oil inlet vertical pipe 1, and oil can be conveyed into the oil inlet vertical pipe 1 through the oil inlet pipeline 4. The top of the oil inlet vertical pipe 1 is provided with a first pressure monitoring sensor 13. The oil inlet pipeline 4 is close to one end of the oil inlet vertical pipe 1, and a supercharging device 41, a second pressure monitoring sensor 43, a pressure regulating valve 42 and a third pressure monitoring sensor 44 are sequentially arranged along the oil flowing direction. The oil gas pipeline 3 is close to one end of the oil inlet riser 1, and a flow regulating valve 32 and a flow stabilizing device 31 are sequentially arranged along the flowing direction of oil gas.
The first pressure monitoring sensor 13 is used for detecting the pressure value of the top in the oil inlet vertical pipe 1; the second pressure monitoring sensor 43 is used for detecting the pressure value of the inner end of the oil inlet pipeline 4 (namely, the end close to the oil inlet riser 1); the third pressure monitoring sensor 44 is used to measure the pressure value at the end of the incoming oil pipe 4 again.
Referring to fig. 2 and 3, a flow-limiting perforated plate 11 is arranged in the oil inlet vertical pipe 1, and the flow-limiting perforated plate 11 is positioned at the lower end of the oil inlet vertical pipe 1 and is perpendicular to the axis of the oil inlet vertical pipe 1; an air inlet hole 12 is formed in the pipe wall of the oil inlet vertical pipe 1, which is positioned between the flow-limiting porous plate 11 and an oil interface in the main chamber 2.
In the embodiment, the pipe diameter of the oil inlet vertical pipe 1 is 700mm, and the pipe fall is 110000mm; the pipe diameter of the oil-gas pipeline 3 is 100mm; the aperture of the flow-limiting perforated plate 11 is 40mm, the number of the holes is 30, and the thickness is 31mm; the air inlet 12 on the oil inlet vertical pipe 1 is positioned 1500mm below the flow-limiting porous plate 11, and the aperture is 25mm.
When the slow release starts, the threshold value of the first pressure monitoring sensor 13 is set to be P2, the threshold value of the second pressure monitoring sensor 43 is set to be P1, and the threshold value of the third pressure monitoring sensor 44 is set to be P1+ dP; and checking the set threshold value to ensure normal initialization.
The pressure Pi at the oil feeding end of the oil inlet pipeline 4 is fed back to the response center for storage through the second pressure monitoring sensor 43, and the following steps are carried out: when Pi is higher than the threshold P1, the pressure regulating valve 42 is opened and the pressure increasing device 41 is closed; when Pi is lower than the threshold value P1, the pressure increasing device 41 is opened and the pressure regulating valve 42 is closed. The third pressure monitoring sensor 44 checks whether Pi is smaller than P1+ dP, and when Pi is stabilized within a range of P1-P1 + dP, starts the oil feeding flow of the oil inlet vertical pipe 1, and automatically starts the first pressure monitoring sensor 13.
After the oil inlet vertical pipe 1 is started by oil feeding, the pressure Pj at the top in the oil inlet vertical pipe 1 is fed back to the response center through the first pressure monitoring sensor 13 for storage, and the following steps are carried out: when the Pj is higher than the threshold value P2, the flow stabilizing device 31 and the flow regulating valve 32 are closed, and oil gas in the main cavern 2 does not enter the oil inlet vertical pipe 1; when Pj is lower than the threshold value P2, the flow regulating valve 32 is opened, and oil gas in the main chamber 2 can enter the oil inlet stand pipe 1 through the oil gas pipeline 3.
Measuring the flow velocity V1 of oil gas entering the oil inlet vertical pipe 1 in the process that Pj is lower than a threshold value P2 and the oil gas in the main chamber 2 enters the oil inlet vertical pipe 1; when the flow velocity V1 exceeds the preset range V0-V0 + dV, the flow stabilizer 31 is turned on to maintain the oil flow entering the negative pressure region at the set velocity range. The flow velocity of the oil gas entering the oil inlet vertical pipe 1 meets the requirement that the oil-gas ratio in the oil inlet vertical pipe 1 is within a range of 17-23.
Under the stable working condition, the dynamic approaching of the Pj value and the Pi value is realized through the pressure regulating valve 42 and the flow regulating valve 32, and the negative pressure at the top in the oil inlet vertical pipe 1 can be fully and slowly released.
The negative pressure area at the bottom in the oil inlet vertical pipe 1 is mainly distributed in the local area below the flow-limiting porous plate 11, and the negative pressure at the position freely breathes oil gas dispersed in the main chamber 2 through the air inlet hole 12 according to the change of the downstream pressure of the oil inlet vertical pipe 1, so that the negative pressure of the local area below the flow-limiting porous plate 11 is automatically compensated.
The negative pressure generated in the oil inlet vertical pipe 1 in the oil feeding process is mainly concentrated on the top of the oil inlet vertical pipe 1 and a local area below the flow-limiting porous plate 11 in the oil inlet vertical pipe 1. According to the method, an oil-gas pipeline 3 is bridged to the top of an oil inlet vertical pipe 1, and oil-gas throttling, flow stabilization and quantification are performed through intelligent logic linkage so as to compensate and break negative pressure at the top in the oil inlet vertical pipe 1; and, this application freely breathes the oil gas of dispersion in the main cavern 2 through inlet port 12, local region negative pressure below the automatic compensation current-limiting perforated plate 11. By adopting the method, the negative pressure in the oil inlet vertical pipe 1 is slowly released, the method has the advantages of good effect, high safety, ecological environmental protection, energy conservation, consumption reduction and the like, the stability of multi-phase flow in the oil inlet vertical pipe 1 can be ensured, and potential engineering accidents such as pipeline vibration or falling of an anchoring pier are effectively avoided.
Example two
The embodiment provides a negative pressure slow release device of an oil inlet riser 1 of an underground water seal cave depot, which is used for realizing the negative pressure slow release method of the oil inlet riser 1 of the underground water seal cave depot according to the embodiment.
Referring to fig. 2, the device comprises a main cavern 2, an oil inlet stand pipe 1 and an oil-gas pipeline 3, wherein the lower ends of the oil inlet stand pipe 1 and the oil-gas pipeline 3 are communicated with the main cavern 2, and the upper end of the oil-gas pipeline 3 is communicated with the upper end of the oil inlet stand pipe 1;
the top of the oil inlet vertical pipe 1 is provided with a first pressure monitoring sensor 13, the oil-gas pipeline 3 is provided with a flow regulating valve 32, and the flow regulating valve 32 can be automatically opened and closed according to the pressure value detected by the first pressure monitoring sensor 13.
When the flow regulating valve 32 is opened, oil gas in the main chamber 2 can enter the oil inlet riser 1 through the oil gas pipeline 3; when the flow regulating valve 32 is closed, oil gas in the main chamber 2 cannot enter the oil inlet riser 1 through the oil gas pipeline 3.
Further, the device also comprises an oil inlet pipeline 4, the tail end of the oil inlet pipeline 4 is communicated with an opening above the oil inlet vertical pipe 1, and oil can be conveyed into the oil inlet vertical pipe 1 through the oil inlet pipeline 4.
In this embodiment, the top of the oil inlet riser 1 is provided with a first pressure monitoring sensor 13. The oil inlet pipe 4 is provided with a pressure increasing device 41, a second pressure monitoring sensor 43, a pressure regulating valve 42 and a third pressure monitoring sensor 44 in sequence along the oil flowing direction, near one end of the oil inlet riser 1. The oil gas pipeline 3 is close to one end of the oil inlet riser 1, and a flow regulating valve 32 and a flow stabilizing device 31 are sequentially arranged along the flowing direction of oil gas.
The first pressure monitoring sensor 13 is used for detecting the pressure value of the top in the oil inlet vertical pipe 1; the second pressure monitoring sensor 43 and the third pressure monitoring sensor 44 are used for detecting the pressure value of the inner end of the oil inlet pipeline 4 (i.e. the end close to the oil inlet riser 1). The pressure increasing device 41 is used for increasing the pressure of the oil flowing out from the oil pipeline 4; the pressure regulating valve 42 is used for reducing the pressure of the oil flowing out from the oil pipeline 4; the flow stabilizer 31 is used for controlling oil gas to enter the oil inlet riser 1 within a set range.
Referring to fig. 2 and 3, a flow-limiting perforated plate 11 is arranged in the oil inlet vertical pipe 1, and the flow-limiting perforated plate 11 is positioned at the lower end of the oil inlet vertical pipe 1 and is perpendicular to the axis of the oil inlet vertical pipe 1; an air inlet hole 12 is arranged on the pipe wall of the oil inlet vertical pipe 1 between the flow-limiting porous plate 11 and the oil interface in the main chamber 2.
The flow-limiting perforated plate 11 is a common workpiece in the oil inlet vertical pipe 1, and is generally a plate-shaped structure on which a plurality of through holes are distributed, and is used for reducing the falling flow of oil in the oil inlet vertical pipe 1.
Alternatively, the number of the intake holes 12 is plural. In this embodiment, the number of the air inlets 12 is two, and the two air inlets 12 are symmetrically distributed on the side wall of the oil inlet vertical pipe 1.
Optionally, the air intake holes 12 are located 1-1.6m below the flow-restricting perforated plate 11, with a pore size in the range of 15-25 mm.
Oil gas dispersed in the oil in the main chamber 2 is filled between the flow-limiting perforated plate 11 and the oil interface in the main chamber 2. In the oil inlet process, the local negative pressure area at the downstream position of the flow-limiting porous plate 11 can freely breathe the oil gas dispersed in the main cavern 2 through the air inlet 12, so that the local negative pressure area at the downstream position of the flow-limiting porous plate 11 is automatically compensated, and the stability of the oil injection process is ensured.
For a specific use method of the device in this embodiment, reference is made to embodiment one, and details are not repeated here.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The negative pressure slow release method of the oil inlet riser of the underground water seal cave depot is characterized by comprising the following steps of:
s1: oil is conveyed into the main cavern through the oil inlet vertical pipe;
s2: measuring a pressure value Pj at the top of the oil inlet vertical pipe in the process of conveying oil into the main cavern;
and when the Pj is smaller than a first preset value P2, oil gas in the main cavity is conveyed to the top of the oil inlet vertical pipe through an oil gas pipeline.
2. The negative pressure slow release method for the oil inlet stand pipe of the underground water seal cavern as claimed in claim 1, wherein in the step S2, after oil gas enters the top of the oil inlet stand pipe, the oil-gas ratio in the oil inlet stand pipe is controlled within a range of 17.
3. The negative pressure slow release method for the oil inlet stand pipe of the underground water seal cavern as claimed in claim 2, wherein in the step S2, oil gas is controlled by a flow stabilizer to enter the oil inlet stand pipe at a set speed.
4. The negative pressure slow release method for the oil inlet riser of the underground water seal cave depot according to claim 1, wherein the step S1 comprises the following steps:
conveying oil to an inlet of an oil inlet vertical pipe through an oil inlet pipeline, and measuring a pressure value Pi at the tail end of the oil inlet pipeline;
when Pi is within a preset range, oil in the oil pipeline is conveyed into the oil inlet vertical pipe, and the oil is conveyed into the main cavity through the oil inlet vertical pipe.
5. The method for slowly releasing the negative pressure of the oil inlet riser of the underground water seal cavern as claimed in claim 4, wherein in the step S1, when Pi is smaller than a second preset value P1, the pressure boosting device is started to adjust Pi to be within a preset range.
6. The method for negative pressure slow release of an oil inlet riser of an underground water seal cavern as claimed in claim 4, wherein in step S1, when Pi is greater than a second preset value P1, the pressure regulating valve is opened to regulate Pi to be within a preset range.
7. The negative pressure slow release method for the oil inlet vertical pipe of the underground water seal cavern as claimed in claim 4, wherein Pj is dynamically close to Pi in the process of conveying oil into the main cavern through the oil inlet vertical pipe.
8. The negative pressure slow release method for the oil inlet vertical pipe of the underground water seal cavern as claimed in any one of claims 1 to 7, wherein in the step S1 and/or the step S2, a flow-limiting porous plate is arranged in the oil inlet vertical pipe, and is positioned at the lower end of the oil inlet vertical pipe and is perpendicular to the axis of the oil inlet vertical pipe;
and the oil inlet vertical pipe is positioned on the pipe wall between the flow-limiting porous plate and the oil interface in the main cavern, and oil gas in the main cavern enters the oil inlet vertical pipe through the air inlet.
9. The negative pressure slow release device for the oil inlet riser of the underground water-sealed cavern is used for realizing the negative pressure slow release method for the oil inlet riser of the underground water-sealed cavern according to any one of claims 1 to 7, and is characterized by comprising a main cavern, the oil inlet riser and an oil-gas pipeline, wherein the lower ends of the oil inlet riser and the oil-gas pipeline are communicated with the main cavern, and the upper end of the oil-gas pipeline is communicated with the upper end of the oil inlet riser;
the oil inlet riser top is provided with first pressure monitoring sensor, be provided with flow control valve on the oil gas pipeline, flow control valve can be according to the automatic switching of pressure value that first pressure monitoring sensor detected.
10. The negative pressure slow release device for the oil inlet vertical pipe of the underground water seal cavern as claimed in claim 9, wherein a flow-limiting perforated plate is arranged in the oil inlet vertical pipe, is positioned at the lower end of the oil inlet vertical pipe and is perpendicular to the axis of the oil inlet vertical pipe;
and the oil inlet vertical pipe is provided with an air inlet hole on the pipe wall between the flow-limiting porous plate and the oil interface in the main chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211418460.7A CN115930107B (en) | 2022-11-14 | Negative pressure slow release method and device for oil inlet vertical pipe of underground water seal cave depot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211418460.7A CN115930107B (en) | 2022-11-14 | Negative pressure slow release method and device for oil inlet vertical pipe of underground water seal cave depot |
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| CN115930107A true CN115930107A (en) | 2023-04-07 |
| CN115930107B CN115930107B (en) | 2024-07-09 |
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