CN115306355A - Device and method for injecting and extracting oil in underground salt cavern oil depot - Google Patents
Device and method for injecting and extracting oil in underground salt cavern oil depot Download PDFInfo
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- CN115306355A CN115306355A CN202211073189.8A CN202211073189A CN115306355A CN 115306355 A CN115306355 A CN 115306355A CN 202211073189 A CN202211073189 A CN 202211073189A CN 115306355 A CN115306355 A CN 115306355A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
Abstract
The invention relates to the field of salt cavern oil storage, in particular to a device and a method for injecting and extracting oil in an underground salt cavern oil depot, wherein the device comprises a pipeline mechanism and a control mechanism; the pipeline mechanism comprises a first pipeline and a second pipeline; one end of the first pipeline is in fluid communication with a gas phase area of the oil-storage salt cavern, and one end of the second pipeline is in fluid communication with a liquid phase area of the oil-storage salt cavern; the control mechanism is arranged on the pipeline mechanism and used for regulating and controlling the pressure state of gas during oil extraction; the problem of exist among the prior art because saturated brine technology when oil recovery, the saturated brine source degree of difficulty is big, the investment is high, needs a large amount of saturated brine simultaneously, and the oil recovery mode is single, has the hidden danger that equipment can't carry out the oil replacement, has ensured the engineering progress, has promoted production efficiency and safety.
Description
Technical Field
The invention relates to the technical field of underground salt cavern oil reservoirs, in particular to a device and a method for injecting and extracting oil in an underground salt cavern oil reservoir.
Background
The underground salt cavern is characterized in that the underground salt cavern is huge in volume and good in sealing according to the remaining mine cavern after salt mine exploitation, and salt under high temperature and high pressure has the characteristic of automatically healing crack strips, so that the technical effect of safely storing petroleum, natural gas and related products can be achieved by injecting the crude oil and the brine or saturated brine thereof for replacement, and meanwhile, the underground salt cavern saves investment relative to a ground storage and is widely applied to developed countries such as the United states, germany and the like.
At present, the crude oil in the rock cavern is usually replaced by saturated salt water or saturated brine in an underground salt cavern oil depot; however, in the saturated brine process, the source of the saturated brine is difficult, and a large amount of saturated brine is needed at the same time, and the prior art shows that about 30 ten thousand of square brines are needed for replacing crude oil or finished oil in 1 salt cavern chamber; when the saturated brine resource is not stored enough, the hidden danger that equipment cannot be subjected to oil replacement exists due to the single equipment replacement mode, the project progress is influenced, and the production efficiency is reduced.
Disclosure of Invention
The invention aims to provide a device and a method for oil injection and extraction of an underground salt cavern oil reservoir, which are used for solving the technical problems that in the prior art, the saturated brine is difficult to source when oil extraction is carried out by a saturated brine process, and the engineering progress is influenced and the production efficiency is reduced because the equipment replacement mode is single and the hidden danger that equipment cannot replace oil exists in the saturated brine.
In a first aspect, the invention provides a device for injecting and extracting oil in an underground salt cavern oil depot, which comprises a pipeline mechanism and a control mechanism;
the pipeline mechanism comprises a first pipeline and a second pipeline; one end of the first pipeline is communicated with a gas phase area of the oil-storing salt cavern in a fluid mode, and one end of the second pipeline is communicated with a liquid phase area of the oil-storing salt cavern in a fluid mode;
the control mechanism is arranged on the pipeline mechanism and used for regulating the on-off state of the first pipeline and the second pipeline.
With reference to the first aspect, the present disclosure provides a first possible implementation manner of the first aspect, wherein an end of the first pipeline facing the oil-salt storage cavern is higher than an end of the second pipeline facing the oil-salt storage cavern.
With reference to the first aspect, the present disclosure provides a second possible implementation manner of the first aspect, wherein the control mechanism includes an injection and production assembly, and the injection and production assembly is in fluid communication with an end of the first pipeline, which faces away from the oil and salt storage cavern; the first pipeline is provided with a first branch pipe, the first branch pipe and the gas injection and production assembly are communicated with the first pipeline in parallel, and the end part of the first branch pipe, which is back to the oil and salt storage hole, is communicated with the end part of the gas injection and production assembly, which is back to the oil and salt storage hole.
With reference to the first possible implementation manner of the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein the gas injection and production assembly includes a first valve body, a second valve body and a pressure control valve, the pressure control valve is in fluid communication with the first valve body and the second valve body, and the second valve body is mounted at an end of the gas injection and production assembly facing the oil and salt storage cavern.
With reference to the first possible implementation manner of the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein the gas injection and production assembly further includes a third valve body, and the first branch pipe is communicated with the third valve body.
With reference to the first possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein the control mechanism further includes a fourth valve body, and the fourth valve body is disposed at an end of the second pipeline, which faces away from the oil-salt storage cavern.
With reference to the first possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the second pipeline is communicated with a second branch pipe, the control mechanism further includes a fifth valve body, and the fifth valve body is disposed at an end of the second branch pipe, which is away from the second pipeline; the second branch pipe is provided with an anticorrosive material.
In a second aspect, the invention also provides a method for injecting and extracting oil from the underground salt cavern oil reservoir, which comprises the device for injecting and extracting oil from the underground salt cavern oil reservoir, and comprises an oil extraction step and an oil injection step;
the oil recovery step comprises:
s11: communicating the end part of the pipeline mechanism, which is far away from the oil storage salt cavern, with a displacer, and adjusting a control mechanism to enable the displacer to enter the oil storage salt cavern along the pipeline mechanism according to the pressure of the displacer relative to the oil storage in the oil storage salt cavern;
when the pressure of the displacement is smaller than the oil storage pressure, the displacement enters the oil storage salt cavern along a first pipeline;
when the pressure of the displacement is larger than the oil storage pressure, the displacement enters the oil storage salt cavern along the second pipeline;
s12, when the pressure of the displacement is smaller than the oil storage pressure, discharging the stored oil along the second pipeline;
when the pressure of the displacement is larger than the oil storage pressure, the oil storage is discharged along the first pipeline;
s13: when the pressure of the displacement is smaller than the oil storage pressure, stopping the injection of the displacement through a control mechanism and stopping oil extraction when the liquid level of the stored oil drops to the end part of the second pipeline facing the oil storage salt cavern;
when the pressure of the displacement is greater than the oil storage pressure, stopping the injection of the displacement through a control mechanism and stopping oil extraction when the liquid level of the stored oil rises to the top of the oil storage salt cavern;
the oil recovery step comprises:
s21, communicating the end part of the pipeline mechanism, which is far away from the oil storage salt cavern, with a crude oil pump, and adjusting a control mechanism and the crude oil pump to enable crude oil to enter the oil storage salt cavern along the pipeline mechanism according to the pressure of the displacer in the oil storage salt cavern relative to the stored oil in the oil storage salt cavern;
when the pressure of the crude oil is larger than that of the displacer, the crude oil enters the oil storage salt cavern along a second pipeline;
when the pressure of the crude oil is less than the pressure of the displacer, the displacer enters the oil-storing salt cavern along the first pipeline;
s22, discharging the displacement along the first pipeline when the pressure of the crude oil is greater than the pressure of the displacement;
discharging the displacement along the second conduit when the pressure of the crude oil is less than the displacement pressure;
s23: when the pressure of the crude oil is greater than the pressure of the displacement object, the liquid level of the stored oil rises to the top of the oil storage salt cavern, the injection of the crude oil is stopped through a control mechanism, and the oil extraction is stopped;
when the pressure of the crude oil is smaller than that of the displacement object, when the liquid level of the stored oil is lowered to the end part of the second pipeline facing the oil storage salt cavern, the injection of the crude oil is stopped through a control mechanism, and the oil extraction is stopped.
With reference to the second aspect, the present invention provides a first possible embodiment of the second aspect, wherein when the pressure of the displacement is lower than the oil reservoir, the fourth valve body, the first valve body, the pressure control valve, and the second valve body are opened when oil production is started, the fifth valve body and the third valve body are closed, and the first valve body and the fourth valve body are closed when oil production is ended;
when the pressure of the displacement is larger than the oil storage pressure, closing the fourth valve body, the first valve body, the control pressure valve and the second valve body and opening the third valve body and the fifth valve body when oil extraction is started; and when oil extraction is finished, closing the third valve body and the fifth valve body.
In combination with the second aspect, the present invention provides a second possible embodiment of the second aspect, wherein, when the oil injection is started when the pressure of the crude oil is greater than the pressure of the displacement, the fourth valve body and the third valve body are opened, and the first valve body, the pressure control valve, the second valve body, and the fifth valve body are closed; when oil injection is finished, the third valve body and the fourth valve body are closed;
when the pressure of the crude oil is smaller than the pressure of the displacement object and oil injection is started, opening the fifth valve body and the third valve body, and closing the first valve body, the pressure control valve, the second valve body and the fourth valve body; and when the oil injection is finished, closing the fifth valve body and the third valve body.
The embodiment of the invention has the following beneficial effects: the control mechanism is arranged on the pipeline mechanism, and the pipeline mechanism comprises a first pipeline and a second pipeline; the one end of first pipeline and the gaseous phase district fluid intercommunication in oil storage salt cavern, the one end of second pipeline and the liquid phase district fluid intercommunication in oil storage salt cavern, according to the difference of different replacers and crude oil pressure, accessible adjustment control mechanism switches the crude oil replacement mode of pipeline mechanism for oil storage salt cavern, and then it is because saturated brine technology is when oil recovery to have alleviated among the prior art, need a large amount of saturated brine simultaneously, when saturated brine is not enough, because equipment replacement mode is single, there is the hidden danger that equipment can't carry out the oil replacement, the engineering progress has been ensured, and the production efficiency is promoted.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced 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 structural diagram of an oil injection and production device for an underground salt cavern oil depot according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of an injection and production assembly of the device for injecting and producing oil in an underground salt cavern oil depot according to the embodiment of the invention;
fig. 3 is a schematic position diagram of a communicating pipe and a sixth valve body in the device for injecting and extracting oil from the underground salt cavern oil reservoir provided by the embodiment of the invention.
Icon: 100-a pipeline mechanism; 110-a first conduit; 120-a second conduit; 130-a first branch; 140-a second branch; 150-communicating tube; 200-a control mechanism; 210-gas injection and production components; 211-a first valve body; 212-a second valve body; 213-a pressure control valve; 220-a third valve body; 230-a fourth valve body; 240-a fifth valve body; 250-a sixth valve body; 300-oil and salt storage cavern; 410 — a first interface; 420 — second interface.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the control mechanism may be in a "manual mode", "electric mode", "pneumatic mode", "gas-liquid mode", "electro-hydraulic mode", or the like. The specific meaning of the above-described manner of action in the present invention can be understood in a specific case by those of ordinary skill in the art.
Example one
As shown in fig. 1 and fig. 2, the device for injecting and extracting oil from an underground salt cavern oil reservoir provided by the invention comprises a pipeline mechanism 100 and a control mechanism 200; the control mechanism 200 is mounted on the piping mechanism 100; the piping mechanism 100 includes a first pipe 110 and a second pipe 120; one end of the first pipeline 110 and one end of the second pipeline 120 are both in fluid communication with the oil-storage salt cavern 300; the end of the first pipe 110 facing the oil-salt cavern 300 is higher than the end of the second pipe 120 facing the oil-salt cavern 300.
In a manner of mounting the control mechanism 200 to the pipe mechanism 100, the pipe mechanism 100 includes a first pipe 110 and a second pipe 120; one end of the first pipe 110 is in fluid communication with the gas phase region of the oil-bearing salt cavern 300, and one end of the second pipe 120 is in fluid communication with the liquid phase region of the oil-bearing salt cavern 300; according to the difference of different substitutes and crude oil pressure, the accessible is adjusted control mechanism 200 and is switched pipeline mechanism 100 and for the crude oil replacement mode of oil storage salt cavern 300, and then has alleviated exist among the prior art because saturated brine technology is when oil recovery, and the saturated brine source degree of difficulty is big, needs a large amount of saturated brine simultaneously, and it is single to change the mode, has the hidden danger that equipment can't carry out the oil replacement, has put the guarantee engineering progress, has promoted production efficiency.
It should be noted that, in order to avoid hidden troubles such as natural gas leakage and brine leakage, the oil-storage salt cavern 300 is internally provided with a first interface 410 and a second interface 420, the second interface 420 is located at the upper part of the first interface 410, an operation area is formed between the first interface 410 and the second interface 420, and one end of the first pipeline 110 facing the oil-storage salt cavern 300 and one end of the second pipeline 120 facing the oil-storage salt cavern 300 are located in the operation area.
Further, the control mechanism 200 includes an injection-production gas assembly 210, and the injection-production gas assembly 210 is in fluid communication with an end of the first pipe 110 facing away from the oil-salt storage cavern 300; the first pipeline 110 is provided with a first branch pipe 130, the first branch pipe 130 and the injection and production gas component 210 are communicated with the first pipeline 110 in parallel, and the end part of the first branch pipe 130 departing from the oil and salt storage hole 300 is communicated with the end part of the injection and production gas component 210 departing from the oil and salt storage hole 300.
When the displacement is a substance with pressure lower than that of crude oil, such as natural gas, the displacement can enter the oil-salt storage cavern 300 from the first pipeline 110 along the gas injection and production assembly 210, and as the end of the first pipeline 110 facing the oil-salt storage cavern 300 is higher than the end of the second pipeline 120 facing the oil-salt storage cavern 300, the crude oil is discharged along the second pipeline 120 under the pressure of the displacement, so that the oil production process is realized.
Further, the gas injection and production assembly 210 comprises a first valve body 211, a second valve body 212 and a pressure control valve 213, the pressure control valve 213 is in fluid communication between the first valve body 211 and the second valve body 212, and the second valve body 212 is mounted at an end of the gas injection and production assembly 210 facing the oil and salt storage hole 300.
The pressure control valve 213 can provide pressure for the displacement entering the gas injection and production assembly 210, meanwhile, the first valve body 211 and the second valve body 212 can be in fluid communication with two ends of the pressure control valve 213, the first valve body 211 is used for controlling the on-off of the displacement entering the first pipeline 110, after the displacement is regulated by the pressure control valve 213, the displacement meeting the displacement pressure condition enters the oil and salt storage hole 300 through the second valve body 212, and the problem that the pressure of the displacement is insufficient and the engineering progress is influenced is avoided.
Further, the gas injection and production assembly 210 further includes a third valve body 220, and the third valve body 220 is communicated with the first branch pipe 130.
Further, the end of the first pipe 110 facing the saltcellar 300 is higher than the end of the second pipe 120 facing the saltcellar 300.
When the pressure of the displacement in the saltcellar 300 is lower than that of the crude oil, the crude oil can enter the saltcellar 300 along the second pipeline 120 during the oil injection process, because the end of the first pipeline 110 facing the saltcellar 300 is higher than the end of the second pipeline 120 facing the saltcellar 300, the crude oil can push the displacement into the end of the first pipeline 110 facing the saltcellar 300, and the displacement can be discharged from the second branch pipe 140 by opening the third valve body 220.
The pressure control valve 213 is a one-way air inlet component, and the arrangement of the second branch pipe 140 can ensure the discharge of the displaced substances and the quality of the oil injection process.
Further, the control mechanism 200 further includes a fourth valve body 230, and the fourth valve body 230 is disposed at an end of the second pipe 120 facing away from the oil-storing salt cavern 300.
When the pressure of the displacement is greater than the pressure of the crude oil, the displacement can enter the oil-storing salt cavern 300 from the second pipeline 120 by controlling the on-off of the fourth valve body 230 during the oil extraction process, because the end of the first pipeline 110 facing the oil-storing salt cavern 300 is higher than the end of the second pipeline 120 facing the oil-storing salt cavern 300, the displacement can push the crude oil to the end of the first pipeline 110 facing the oil-storing salt cavern 300, and the crude oil is output along the first branch pipe 130 through the first pipeline 110.
When the pressure of the displaced substance is greater than the pressure of the crude oil, the crude oil is injected into the reserve salt cavern 300 through the first branch pipe 130 along the first pipe 110 and the displaced substance in the reserve salt cavern 300 is discharged through the second pipe 120 when the oil injection process is performed.
Further, the second pipeline 120 is communicated with a second branch pipe 140, the control mechanism 200 further includes a fifth valve body 240, and the fifth valve body 240 is disposed at an end of the second branch pipe 140 away from the second pipeline 120; the second branch pipe 140 is provided with a corrosion-resistant material.
When the displacement is corrosive substances such as saturated brine and the like and the pressure of the displacement is higher than that of the crude oil, the second branch pipe 140 is provided with an anticorrosive material, so that the crude oil is injected into the oil storage salt cavern 300 along the first pipeline 110 through the first branch pipe 130 during the oil injection process, and the displacement in the oil storage salt cavern 300 is output through the second branch pipe 140 along the second pipeline 120; meanwhile, when the oil extraction process is performed, the displacement can enter the oil-storage salt cavern 300 from the second branch pipe 140 along the second pipeline 120 by controlling the on-off of the fifth valve body 240, because the end part of the first pipeline 110 facing the oil-storage salt cavern 300 is higher than the end part of the second pipeline 120 facing the oil-storage salt cavern 300, the displacement can push crude oil to the end part of the first pipeline 110 facing the oil-storage salt cavern 300, and the crude oil is output along the first branch pipe 130 through the first pipeline 110, so that the corrosion resistance of the pipeline is improved, the service life is prolonged, and the production cost is reduced.
It should be noted that the first valve body 211, the second valve body 212, the third valve body 220, the fourth valve body 230, and the fifth valve body 240 all adopt pneumatic battery valves, and the control mechanism 200 is installed on the ground, so as to facilitate the operation and inspection of an operator.
The invention also provides a method for injecting oil in the underground salt cavern oil reservoir, which comprises the step of oil extraction and the step of oil injection;
the oil extraction step comprises:
s1: the end part of the pipeline mechanism 100 departing from the oil-storage salt cavern 300 is communicated with the displacement, and the control mechanism 200 is adjusted according to the pressure of the displacement relative to the oil storage in the oil-storage salt cavern 300 so that the displacement enters the oil-storage salt cavern 300 along the pipeline mechanism 100;
when the pressure of the displacement is less than the oil storage pressure, the displacement enters the oil storage salt cavern 300 along the first pipeline 110;
when the pressure of the displacement is larger than the oil storage pressure, the displacement enters the oil storage salt cavern 300 along the second pipeline 120;
s2, when the pressure of the displacement is smaller than the oil storage pressure, the stored oil is discharged along the second pipeline 120;
when the pressure of the displacer is greater than the trapped oil pressure, the trapped oil is discharged along the first conduit 110;
s3: when the pressure of the displacement is lower than the oil storage pressure, the injection of the displacement is stopped by the control mechanism 200 when the oil storage level drops to the end of the second pipeline 120 facing the oil storage cavern 300, and the oil extraction is stopped;
when the pressure of the displacement is higher than the oil storage pressure, the injection of the displacement is stopped by the control mechanism 200 when the liquid level of the stored oil rises to the top of the oil storage salt cavern 300, and the oil extraction is stopped;
the oil extraction step comprises:
s1, communicating the end part of the pipeline mechanism 100, which is far away from the oil storage salt cavern 300, with a crude oil pump, and adjusting a control mechanism 200 and the crude oil pump to enable crude oil to enter the oil storage salt cavern 300 along the pipeline mechanism 100 according to the pressure of a displacement object in the oil storage salt cavern 300 relative to the stored oil in the oil storage salt cavern 300;
when the pressure of the crude oil is greater than that of the displacer, the crude oil enters the oil-storing salt cavern 300 along the second pipeline 120;
when the pressure of the crude oil is less than the pressure of the displacer, the displacer enters the oil-storing salt cavern 300 along the first pipeline 110;
s2, when the pressure of the crude oil is greater than the pressure of the displacement, discharging the displacement along the first pipeline 110;
when the pressure of the crude oil is less than the displacer pressure, the displacer is discharged along the second pipe 120;
s3: when the pressure of the crude oil is greater than the pressure of the displacement, the liquid level of the stored oil rises to the top of the oil storage salt cavern 300, the injection of the crude oil is stopped through the control mechanism 200, and the oil extraction is stopped;
when the pressure of the crude oil is lower than that of the displacement, the injection of the crude oil is stopped by the control mechanism 200 when the liquid level of the stored oil drops to the end of the second pipeline 120 facing the oil-storing salt cavern 300, and the oil production is stopped.
Further, when the pressure of the displaced matter is lower than the oil reservoir, the fourth valve body 230, the first valve body 211, the pressure control valve 213, and the second valve body 212 are opened, the fifth valve body 240 and the third valve body 220 are closed, and when the oil reservoir is completed, the first valve body 211 and the fourth valve body 230 are closed; when the pressure of the displacement is larger than the oil storage pressure and oil extraction is started, the fourth valve body 230, the first valve body 211, the control pressure valve and the second valve body 212 are closed, and the third valve body 220 and the fifth valve body 240 are opened; when oil production is finished, the third valve body 220 and the fifth valve body 240 are closed.
When the pressure of the displacement is smaller than that of the stored oil, when oil production is started, the fourth valve body 230, the first valve body 211, the pressure control valve 213 and the second valve body 212 are opened, the fifth valve body 240 and the third valve body 220 are closed, the displacement enters the oil storage salt cavern 300 along a passage formed by the gas injection and production assembly 210, the stored oil in the oil storage salt cavern 300 is output along the second pipeline 120 where the fourth valve body 230 is located, and when oil production is finished, the first valve body 211 and the fourth valve body 230 are closed.
When the pressure of the displacement is larger than the oil storage pressure and oil extraction is started, the fourth valve body 230, the first valve body 211, the control pressure valve and the second valve body 212 are closed, and the third valve body 220 and the fifth valve body 240 are opened; the displacement enters the oil-salt storage cavern 300 along the second branch pipe 140 where the fifth valve body 240 is located, the displacement stored in the oil-salt storage cavern 300 is output along the first branch pipe 130 where the third valve body 220 is located, and when oil production is finished, the third valve body 220 and the fifth valve body 240 are closed.
Further, when the pressure of the crude oil is greater than the pressure of the displacement, and oil injection is started, the fourth valve body 230 and the third valve body 220 are opened, and the first valve body 211, the pressure control valve 213, the second valve body 212, and the fifth valve body 240 are closed; when the oil injection is finished, the third valve body 220 and the fourth valve body 230 are closed; when the pressure of the crude oil is lower than the pressure of the displacement objects, the fifth valve body 240 and the third valve body 220 are opened, and the first valve body 211, the pressure control valve 213, the second valve body 212 and the fourth valve body 230 are closed when the oil injection is started; when the oil injection is finished, the fifth valve body 240 and the third valve body 220 are closed.
When the pressure of the crude oil is greater than the pressure of the displacement, when oil injection is started, the fourth valve body 230 and the third valve body 220 are opened, the first valve body 211, the pressure control valve 213, the second valve body 212 and the fifth valve body 240 are closed, the crude oil enters the oil-storing salt cavern 300 along the second pipeline 120 where the fourth valve body 230 is located, and the displacement in the oil-storing salt cavern 300 is output along the first branch pipe 130 where the third valve body 220 is located;
when the oil injection is stopped, the third valve body 220 and the fourth valve body 230 may be closed.
When the pressure of the crude oil is lower than the pressure of the displacement objects, the fifth valve body 240 and the third valve body 220 are opened, and the first valve body 211, the pressure control valve 213, the second valve body 212 and the fourth valve body 230 are closed when the oil injection is started; crude oil enters the oil-salt cavern 300 along the first branch pipe 130 where the third valve body 220 is located, and displacement in the oil-salt cavern 300 is discharged along the second branch pipe 140 where the fifth valve body 240 is located; when the oil injection is stopped, the third valve body 220 and the fifth valve body 240 may be closed.
It should be noted that, when the pressure of the crude oil is lower than the pressure of the displacement material, and the displacement material is a non-corrosive material, the displacement material can also be directly connected to the liquid phase region by the second pipeline 120, and the second branch pipe 140 is closed, specifically: when oil extraction is started, the fifth valve body 240, the first valve body 211, the control pressure valve and the second valve body 212 are closed, and the third valve body 220 and the fourth valve body 230 are opened; when oil production is finished, the third valve body 220 and the fourth valve body 230 are closed; when oil injection is started, the fourth valve body 230 and the third valve body 220 are opened, and the first valve body 211, the pressure control valve 213, the second valve body 212 and the fifth valve body 240 are closed; when the oil injection is completed, the fourth valve body 230 and the third valve body 220 are closed.
Example two
As shown in fig. 3, the device for injecting and extracting oil from an underground salt cavern oil depot provided by the present invention may further include a communication pipe 150 and a sixth valve body 250, the communication pipe 150 is fluidly communicated between the first branch pipe 130 and the second pipeline 120, and the sixth valve body 250 is disposed at an end of the communication pipe 150 facing the second pipeline 120, and when oil extraction is performed, the steps thereof are as follows:
s31, when the pressure of the displacement in the oil storage salt cavern 300 is larger than the oil storage pressure, closing the gas injection and production assembly 210 and the fourth valve body 230, opening the third valve body 220, the fifth valve body 240 and the sixth valve body 250, and enabling the displacement to enter the oil storage salt cavern 300 along the second branch pipe 140;
s32, simultaneously discharging oil from the crude oil along the first branch pipe 130 and the communicating pipe 150;
s33: the third valve body 220, the fifth valve body 240, and the sixth valve body 250 are closed when the oil-water interface of the trapped oil drops to the first interface 410 or when the first conduit 110 displacement pressure equals the second conduit 120 crude oil pressure.
When oiling, its step lies in:
s41, when the pressure of the displacement in the oil storage salt cavern 300 is greater than the oil storage pressure, the sixth valve body 250, the third valve body 220 and the fifth valve body 240 are opened, and the crude oil respectively enters the oil storage salt cavern 300 along the communicating pipe 150 and the first branch pipe 130;
s42: the displacement is discharged along the second conduit 120;
s43, when the oil-water interface of the stored oil rises to the second interface 420 or the pressure of the crude oil in the first pipeline 110 is equal to the pressure of the displaced object in the second pipeline 120, the third valve body 220, the fifth valve body 240 and the sixth valve body 250 are closed, and the oil injection is stopped.
The sixth valve body 250 and the communication pipe 150 are provided to reduce the time for oil injection or oil extraction, thereby improving the working efficiency.
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 device for injecting and extracting oil in the underground salt cavern oil depot is characterized by comprising a pipeline mechanism (100) and a control mechanism (200);
the pipe mechanism (100) comprises a first pipe (110) and a second pipe (120); one end of the first pipeline (110) is in fluid communication with a gas phase region of a salt cavern (300) and one end of the second pipeline (120) is in fluid communication with a liquid phase region of the salt cavern (300);
the control mechanism (200) is installed on the pipeline mechanism (100), and the control mechanism (200) is used for regulating and controlling the on-off state of the first pipeline (110) and the second pipeline (120).
2. An apparatus for injection and production of oil in a subterranean salt cavern oil depot according to claim 1, wherein the end of the first conduit (110) towards the oil-salt storage cavern (300) is higher than the end of the second conduit (120) towards the oil-salt storage cavern (300).
3. The device for oil injection and production in an underground salt cavern oil depot according to claim 1, wherein the control mechanism (200) comprises an injection and production assembly (210), and the injection and production assembly (210) is in fluid communication with the end of the first pipeline (110) away from the oil storage salt cavern (300); the first pipeline (110) is provided with a first branch pipe (130), the first branch pipe (130) and the oil and gas injection and production assembly (210) are communicated with the first pipeline (110) in parallel, and the end part of the first branch pipe (130) departing from the oil and gas storage salt cavern (300) is communicated with the end part of the oil and gas injection and production assembly (210) departing from the oil and gas storage salt cavern (300).
4. The device for oil injection and production in an underground salt cavern oil depot according to claim 3, wherein the gas injection and production assembly (210) comprises a first valve body (211), a second valve body (212) and a pressure control valve (213), the pressure control valve (213) is in fluid communication with the first valve body (211) and the second valve body (212), and the second valve body (212) is mounted at the end of the gas injection and production assembly (210) facing the oil storage salt cavern (300).
5. The device for injection oil recovery of the underground salt cavern oil depot according to claim 4, wherein the injection and production assembly (210) further comprises a third valve body (220), and the first branch pipe (130) is communicated with the third valve body (220).
6. An oil injection and production device for an underground salt cavern oil depot according to claim 1, wherein the control mechanism (200) further comprises a fourth valve body (230), and the fourth valve body (230) is arranged at the end of the second pipeline (120) which is far away from the oil storage salt cavern (300).
7. The device for injecting and recovering oil in an underground salt cavern oil depot as claimed in claim 6, wherein the second pipeline (120) is communicated with a second branch pipe (140), the control mechanism (200) further comprises a fifth valve body (240), and the fifth valve body (240) is arranged at the end part of the second branch pipe (140) which is far away from the second pipeline (120);
the second branch pipe (140) is provided with an anticorrosive material.
8. A method for oil injection and production in an underground salt cavern oil depot, which comprises the device for oil injection and production in the underground salt cavern oil depot according to any one of claims 1 to 7, and is characterized by comprising an oil production step and an oil injection step,
the oil recovery step comprises:
s11: communicating the end part of the pipeline mechanism (100) departing from the oil-storage salt cavern (300) with a displacer, and adjusting the pressure of the displacer by using an adjusting and controlling mechanism (200) according to the pressure of the displacer relative to the oil storage in the oil-storage salt cavern (300), so that the displacer enters the oil-storage salt cavern (300) along the pipeline mechanism (100);
when the pressure of the displacement is smaller than the pressure of the stored oil, the displacement enters the oil-storing salt cavern (300) along a first pipeline (110);
when the pressure of the displacement is larger than the pressure of the stored oil, the displacement enters the oil-storing salt cavern (300) along the second pipeline (120);
s12, when the pressure of the displacement is smaller than the pressure of the stored oil, the stored oil is discharged along the second pipeline (120);
-when the pressure of the displacement is greater than the pressure of the trapped oil, the trapped oil is drained along the first conduit (110);
s13: when the pressure of the displacement is smaller than the pressure of the stored oil, stopping the injection of the displacement through a control mechanism (200) and stopping oil production when the liquid level of the stored oil is reduced to the end part of the second pipeline (120) facing an oil storage salt cavern (300);
when the pressure of the displacement is larger than the pressure of the stored oil, when the liquid level of the stored oil rises to the top of the oil-storing salt cavern (300), stopping the injection of the displacement through a control mechanism (200) and stopping oil production;
the oiling step comprises the following steps:
s21, communicating the end part, deviating from the oil storage salt cavern (300), of the pipeline mechanism (100) with a crude oil pump, and adjusting a control mechanism (200) and the crude oil pump to enable crude oil to enter the oil storage salt cavern (300) along the pipeline mechanism (100) according to the pressure of the displacement matter in the oil storage salt cavern (300) relative to the stored oil in the oil storage salt cavern (300);
when the pressure of the crude oil is greater than the pressure of the displacer, the crude oil enters the oil-holding salt cavern (300) along a second pipeline (120);
when the pressure of the crude oil is less than the displacer pressure, the displacer enters the reservoir cavern (300) along the first conduit (110);
s22, discharging the displacement along the first pipeline (110) when the pressure of the crude oil is larger than the pressure of the displacement;
when the pressure of the crude oil is less than the displacer pressure, the displacer is discharged along the second conduit (120);
s23: when the pressure of the crude oil is larger than the pressure of the displacement, the liquid level of the stored oil rises to the top of the oil storage salt cavern (300), the injection of the crude oil is stopped through a control mechanism (200), and the oil extraction is stopped;
when the pressure of the crude oil is smaller than that of the displacement, when the liquid level of the stored oil is lowered to the end part of the second pipeline (120) facing the oil storage salt cavern (300), the injection of the crude oil is stopped through a control mechanism (200), and the oil extraction is stopped.
9. The method for oil injection and recovery of a subterranean salt cavern oil reservoir of claim 8, wherein when the pressure of the displacement is less than the reservoir oil, oil recovery is started by opening the fourth valve body (230), the first valve body (211), the pressure control valve (213) and the second valve body (212), closing the fifth valve body (240) and the third valve body (220), and oil recovery is ended by closing the first valve body (211) and the fourth valve body (230);
when the pressure of the displacement is larger than the oil storage pressure and oil extraction is started, the fourth valve body (230), the first valve body (211), the control pressure valve and the second valve body (212) are closed, and the third valve body (220) and the fifth valve body (240) are opened; when oil production is finished, the third valve body (220) and the fifth valve body (240) are closed.
10. The method for oil recovery at an underground salt cavern oil depot according to claim 9, characterized in that when the pressure of the crude oil is higher than the pressure of the displacer and the oil injection is started, the fourth valve body (230) and the third valve body (220) are opened, and the first valve body (211), the pressure control valve (213), the second valve body (212) and the fifth valve body (240) are closed; when the oil filling is finished, the third valve body (220) and the fourth valve body (230) are closed;
when the pressure of the crude oil is less than the pressure of the displacement object, starting oil injection, opening the fifth valve body (240) and the third valve body (220), and closing the first valve body (211), the pressure control valve (213), the second valve body (212) and the fourth valve body (230); and when the oiling is finished, closing the fifth valve body (240) and the third valve body (220).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211073189.8A CN115306355A (en) | 2022-09-02 | 2022-09-02 | Device and method for injecting and extracting oil in underground salt cavern oil depot |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211073189.8A CN115306355A (en) | 2022-09-02 | 2022-09-02 | Device and method for injecting and extracting oil in underground salt cavern oil depot |
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| CN202211073189.8A Pending CN115306355A (en) | 2022-09-02 | 2022-09-02 | Device and method for injecting and extracting oil in underground salt cavern oil depot |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3438203A (en) * | 1967-08-08 | 1969-04-15 | Shell Oil Co | Method of removing hydrocarbons from salt caverns |
| CN211008597U (en) * | 2019-10-09 | 2020-07-14 | 陈飞 | Double-pipe well completion device for salt cavern gas storage |
| CN215292594U (en) * | 2021-03-09 | 2021-12-24 | 中盐金坛盐化有限责任公司 | Constant pressure type salt cavern gas storage system |
| CN114056834A (en) * | 2021-10-29 | 2022-02-18 | 中国科学院武汉岩土力学研究所 | Oil-gas mixed storage structure and storage and collection method |
| CN114856507A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas injection and production device and gas injection and production method for salt cavern gas storage |
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2022
- 2022-09-02 CN CN202211073189.8A patent/CN115306355A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3438203A (en) * | 1967-08-08 | 1969-04-15 | Shell Oil Co | Method of removing hydrocarbons from salt caverns |
| CN211008597U (en) * | 2019-10-09 | 2020-07-14 | 陈飞 | Double-pipe well completion device for salt cavern gas storage |
| CN114856507A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas injection and production device and gas injection and production method for salt cavern gas storage |
| CN215292594U (en) * | 2021-03-09 | 2021-12-24 | 中盐金坛盐化有限责任公司 | Constant pressure type salt cavern gas storage system |
| CN114056834A (en) * | 2021-10-29 | 2022-02-18 | 中国科学院武汉岩土力学研究所 | Oil-gas mixed storage structure and storage and collection method |
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