CN110645047B - Salt cavern gas storage and gas injection and production method thereof - Google Patents
Salt cavern gas storage and gas injection and production method thereof Download PDFInfo
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- CN110645047B CN110645047B CN201911048688.XA CN201911048688A CN110645047B CN 110645047 B CN110645047 B CN 110645047B CN 201911048688 A CN201911048688 A CN 201911048688A CN 110645047 B CN110645047 B CN 110645047B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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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
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The invention relates to the technical field of petroleum and natural gas, in particular to a salt cavern gas storage, which comprises the following components: the air bag is positioned in a salt cavern, the salt cavern is positioned below the ground surface, air is stored in the salt cavern, and the air bag is used for storing natural gas; a second pipeline, one end of which is connected with the air bag, and the other end of which is positioned above the ground surface, wherein the second pipeline is used for injecting the natural gas into the air bag or discharging the natural gas from the air bag; first pipeline, first pipeline nestification is in the second pipeline outside, the pit shaft entry in salt cave is connected to the one end of first pipeline, the other end of first pipeline is located the earth's surface, first pipeline be used for with the air is followed discharge in the salt cave or to inject the air in the salt cave, consequently, can all extract the natural gas in the gasbag, can not leave and fill up bottom gas, avoid the waste of natural gas.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas, in particular to a salt cavern gas storage and a gas injection and production method thereof.
Background
In the existing salt cavern gas storage, in order to ensure the stability of the salt cavern surrounding rock, the natural gas stored in the salt cavern gas storage is not completely produced when being produced, but certain bottom gas is reserved, so that the cavity in the salt cavern keeps certain pressure. For example, for a 1000m salt cavern gas reservoir, 6MPa is used as the pressure of the bottom gas.
The bottom gas is left in the salt cavern, thereby causing the waste of the natural gas.
Disclosure of Invention
In view of the above, the present invention has been developed to provide a salt cavern gas storage and a method of injecting and producing gas in a salt cavern gas storage that overcome, or at least partially solve, the above problems.
In a first aspect, the present invention provides a salt cavern gas storage comprising:
the air bag is positioned in a salt cavern, the salt cavern is positioned below the ground surface, air is stored in the salt cavern, and the air bag is used for storing natural gas;
a second pipeline, one end of which is connected with the air bag, and the other end of which is positioned above the ground surface, wherein the second pipeline is used for injecting the natural gas into the air bag or discharging the natural gas from the air bag;
the first pipeline is nested outside the second pipeline, one end of the first pipeline is connected with a shaft inlet of the salt cavern, the other end of the first pipeline is positioned on the ground surface, and the first pipeline is used for discharging the air from the salt cavern or injecting the air into the salt cavern.
Preferably, a first valve is arranged at the inlet of the first pipeline, and a second valve is arranged at the inlet of the second pipeline.
Preferably, the method further comprises the following steps: an air bag leakage monitoring device;
the air bag leakage detector comprises a plurality of detection electrodes, a gas analysis device and an alarm device, wherein the detection electrodes are connected with the gas analysis device through leads, the alarm device is connected with the gas analysis device, the detection electrodes are arranged in a salt cavity outside the air bag, and the gas analysis device and the alarm device are both arranged on the ground;
when natural gas leaks from the air bag to the salt cavern, the natural gas is detected by more than one of the detection electrodes, the gas analysis device analyzes the detected natural gas, and when the analysis is confirmed, the alarm device is triggered to alarm.
In a second aspect, the present invention further provides a method for injecting gas into a salt cavern gas storage, which is applied to the salt cavern gas storage, and includes:
through the second pipeline to inject the natural gas into the gasbag, the air in the salt cave intracavity is through first pipeline is discharged, makes the pressure in the salt cave intracavity reaches maximum operating pressure, the volume of gasbag reaches maximum volume.
Preferably, before injecting the natural gas into the air bag through the second pipeline, the method further comprises:
specifically, the mass of the injected natural gas is obtained by the following formula:
wherein the content of the first and second substances,
wherein m isgeFor the quality of the injected natural gas, MgIs the molar mass of the natural gas, VeIs the volume of the balloon, PmaxAt present, the maximum operating pressure of the salt cavern, Z is the compression coefficient of the natural gas, R is the constant of the natural gas, T is the current temperature of the natural gas, and P iscIs the critical pressure, T, of the natural gascIs the critical temperature of the natural gas.
Preferably, before injecting the natural gas into the air bag through the second pipeline, the method further comprises:
injecting a marking substance into the air bag for prompting that the natural gas is completely produced when the natural gas is completely produced;
the marking substance is specifically any one of the following substances: water, carbon dioxide, propane and butane.
In a third aspect, the present invention further provides a method for gas production in a salt cavern gas storage, which is applied to the salt cavern gas storage, and includes:
injecting air into the salt cavern cavity through the first pipeline, and extracting natural gas in the air bag through the second pipeline to ensure that the air pressure in the salt cavern cavity is not lower than the minimum operating pressure.
Preferably, the injecting air into the salt cavern cavity through the first pipeline to extract the natural gas in the air bag through the second pipeline specifically includes:
injecting air into the salt cavern cavity at a first gas injection speed, and simultaneously extracting natural gas in the air bag at a first gas extraction speed, wherein the first gas injection speed is equal to the first gas extraction speed.
Preferably, the injecting air into the salt cavern cavity through the first pipeline to extract the natural gas in the air bag through the second pipeline specifically includes:
injecting air into the salt cavern cavity at a second gas injection speed, and simultaneously extracting natural gas in the air bag at a second gas extraction speed, wherein the second gas injection speed is less than the second gas extraction speed;
when the pressure in the salt cavern is reduced to the minimum operation pressure, the natural gas in the air bag is temporarily extracted, and air is continuously injected into the salt cavern at the second gas injection speed;
when the pressure in the salt cavern cavity rises to the maximum operation pressure, the natural gas in the air bag is continuously produced at the second gas production speed, air is continuously injected into the salt cavern cavity at the second gas injection speed, and the pressure in the salt cavern cavity is kept to be not lower than the minimum operation pressure.
Preferably, the injecting air into the salt cavern cavity through the first pipeline to extract the natural gas in the air bag through the second pipeline specifically includes:
injecting air into the salt cavern cavity at the second gas injection speed, and simultaneously extracting natural gas in the air bag at the second gas extraction speed, wherein the second gas injection speed is less than the second gas extraction speed;
and when the pressure in the salt cavern cavity is reduced to the minimum operation pressure, extracting the natural gas in the air bag at a third gas extraction speed, wherein the third gas extraction speed is lower than the second gas injection speed, and the pressure in the salt cavern cavity is kept to be not lower than the minimum operation pressure.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention provides a salt cavern gas storage, which comprises a first pipeline arranged at the inlet of a salt cavern shaft, an air bag and a second pipeline arranged at the inlet of the air bag, wherein the air bag is positioned in a salt cavern cavity, the air bag is used for storing natural gas, the salt cavern is positioned below the ground surface, and air is stored in the salt cavern; wherein the second pipeline is nested in the first pipeline; the one end and the gasbag of this second pipeline are connected, the other end is located above the earth's surface, this second pipeline is used for injecting into the natural gas or discharging the natural gas from this gasbag in to this gasbag, the pit shaft entry of salt cave is connected to the one end of this first pipeline, the other end of first pipeline is located above the earth's surface, this first pipeline is used for discharging the air from the salt cave or to injecting the air into in the salt cave, consequently, can all adopt the natural gas in the gasbag when adopting gas, need not to leave the backing gas, it has minimum operating pressure to keep in the salt cave through the mode of filling the air between gasbag and salt cave, thereby can avoid the waste of natural gas.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 shows a schematic diagram of the structure of a salt cavern gas storage in an embodiment of the invention;
FIG. 2 is a schematic diagram showing the structure of an embodiment of the present invention after placement of a balloon into the salt cavern;
FIG. 3 is a schematic view of the malformed configuration of a bladder placed within a salt cavern in an embodiment of the invention;
fig. 4 shows a schematic diagram of the pressure change of the salt cavern cavity pressure in the whole process in the embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
An embodiment of the present invention provides a salt cavern gas storage, as shown in fig. 1, including:
the air bag 102 is positioned in the salt cavern A, the salt cavern A is positioned below the ground surface, air is stored in the salt cavern A, and the air bag 102 is used for storing natural gas;
a second pipeline 103, one end of the second pipeline 103 is connected with the air bag 102, the other end of the second pipeline 103 is positioned on the ground surface, and the second pipeline 103 is used for injecting natural gas into the air bag 102 or discharging the natural gas from the air bag 102;
the first pipeline 101 is nested outside the second pipeline 103, one end of the first pipeline 101 is connected with a shaft inlet of the salt cavern A, the other end of the first pipeline 101 is located on the ground surface, and the first pipeline 101 is used for exhausting air from the salt cavern A or injecting air into the salt cavern A.
In a specific embodiment, brine is originally stored in the salt cavern a, and an air injection and brine discharge manner is adopted to fill the salt cavern a with air, specifically high-pressure air, because the underground salt cavern is relatively deep, when the air is injected, the inflation pressure needs to be greater than the pressure of the stored brine, for example, 1000m salt cavern, and the inflation pressure should be about 12 MPa.
After the salt cavern A is filled with air, the natural gas is stored by adopting the salt cavern gas storage. Specifically, in the air with a first preset pressure stored in the salt cavern a, the customized air bag 102 is folded and folded into a cylinder shape, and can directly pass through the shaft, the inlet of the air bag 102 is connected with a second pipeline 103, and the second pipeline 103 sends the air bag 102 into the salt cavern a through a first pipeline 101 and the shaft. The first preset pressure is specifically the pressure equal to the pressure of brine originally stored, and is smaller than the maximum operating pressure, where the maximum operating pressure is the maximum pressure that the inner wall of the salt cavern cavity can bear. As shown in particular in fig. 2.
The material of the airbag 102 is specifically any one of the following: PVC or TPU, wherein the PVC has the performances of gasoline, petroleum and brine corrosion resistance, wear resistance, pressure resistance, sun resistance and the like, and has a certain bearing capacity, the selected PVC specifically adopts 'super-Tough (TM)' high polymer material used by the Intex inflatable boat, and the high-density and high-toughness polymerized plastic and the high-strength thermal carbon polymerized PVC plastic are high-molecular and high-toughness adhesive tapes; the TPU has the properties of high strength, wear resistance, high elasticity, bending resistance, good air tightness and the like. Balloon materials such as those used for hot air balloons: nylon 70D, nylon 210D, nylon 420D, nylon 840D, and the like.
The shape of the airbag may be regular or irregular (malformed), and according to the principle that the airbag does not directly contact with the salt cavern due to creep of the salt cavern, when the shape of the airbag is regular, the distance between the airbag and the salt cavern is specifically 0.2 to 1m, and when the shape of the airbag is malformed, the distance between the airbag 102 and the salt cavern a is specifically 1 to 2m, as shown in fig. 3, of course, the distance may be further specifically set according to specific conditions, and is not further specifically described in the embodiment of the present invention.
Specifically, the shape of the airbag should be similar to the shape of the salt cavern, but slightly smaller than the salt cavern, and the shape of each salt cavern is unique, so that the shape of the airbag customized for each salt cavern is also unique.
The sonar cavity measuring method is characterized in that a BSF2 sonar distance meter is lowered down along a well drilling shaft through a cable of an integrated logging winch, a sonar probe of the sonar distance meter enters a salt cavern cavity after being discharged from a casing pipe, acoustic pulses are emitted to the salt cavern cavity on a certain horizontal section, a sonar receiving device detects and receives echo signals, the echo signals are transmitted back to a ground data processing system through the cable connected with a downhole instrument, a cavity horizontal section at a certain depth is obtained, the measuring depth is changed, and cavity horizontal section at different depths can be obtained; measuring distances at different inclination angles of the top, the bottom and the abnormal part of the salt cavern cavity by using an inclination measuring function; the two kinds of original measurement data are processed by a computer and are explained later, and finally the volume, the depth, the three-dimensional image and various related parameters of the whole cavity are obtained.
When the natural gas is injected into the bladder 102, there are two types of injection, the first is to inject the natural gas while releasing the air, keeping the pressure of the cavity of the salt cavern a constant, and continuing to inject the natural gas into the bladder when the remaining amount of the air in the cavity of the salt cavern a reaches a minimum value (the minimum value is the minimum value of the air pressure stored in the gap between the bladder 102 and the inner wall of the cavity of the salt cavern a when the natural gas in the bladder 102 reaches a maximum value). Then, until the pressure in the salt cavern rises to the maximum operating pressure.
The second method is to keep the air pressure outside the air bag constant, directly inject natural gas into the air bag until the pressure rises to the maximum operating pressure, then inject natural gas and release air simultaneously, so as to keep the pressure (maximum operating pressure) in the salt cavern constant until the air bag reaches the maximum volume, and the maximum volume of the air bag 102 is specifically the volume of the air bag 102 which is not excessively expanded but is expanded by the gas.
Therefore, a first valve 1011 is disposed at the inlet of the first pipeline 101, and a second valve 1031 is disposed at the inlet of the second pipeline 103, so as to achieve the asynchronous operation of injecting the natural gas and releasing the air, and meanwhile, the first valve 1031 and the second valve 1032 can achieve effective control of gas production speed, thereby improving gas production efficiency.
No matter which mode is adopted, the pressure in the salt cavity finally needs to be enabled to reach the maximum operation pressure, and the volume of the air bag reaches the maximum volume. Thereby make the natural gas that holds in this gasbag reach the maximum value, make full use of the effective space of gasbag.
An air bag leakage detection device is also arranged in the salt cavern gas storage, and comprises a gas detector and an alarm;
the gas detector is arranged in the salt cavern outside the air bag and used for detecting marked gas added in the leaked natural gas when the air bag is damaged;
the alarm is connected with the gas detector through a wire and arranged on the ground surface and used for alarming when the gas detector detects the indicating gas.
The method is characterized in that a marked gas is added to the natural gas to monitor whether the natural gas mixed with the marked gas leaks or not, wherein the marked gas is specifically any one of the following gases: helium, phosphine, and ammonia.
By adopting the air bag leakage detection device, when the air bag 102 is detected to have leakage, a user can be timely informed to inject air into the salt cavern, so that the natural gas in the air bag can be discharged as soon as possible to replace a new air bag.
Example two
Based on the same inventive concept, the embodiment of the present invention further provides a method for injecting gas into a salt cavern gas storage, which is applied to the salt cavern gas storage of the claims, and comprises:
through the second pipeline to inject the natural gas into the gasbag, the air in the salt cave intracavity is through first pipeline with the second pipeline between the clearance discharge, make pressure in the salt cave intracavity reaches maximum operating pressure, the volume of gasbag reaches maximum volume.
In a preferred embodiment, the gas injection is performed in particular by the two gas injection methods described above, so that the pressure in the salt cavern reaches the maximum operating pressure and the volume of the airbag reaches the maximum volume.
In a preferred embodiment, before injecting the natural gas into the air bag through the second pipeline, the method further comprises:
specifically, the mass of the injected natural gas is obtained by the following formula:
wherein the content of the first and second substances,
wherein m isgeFor the quality of the injected natural gas, MgIs the molar mass of the natural gas, VeIs the volume of the balloon, PmaxAt present, the maximum operating pressure of the salt cavern, Z is the compression coefficient of the natural gas, R is the constant of the natural gas, T is the current temperature of the natural gas, and P iscIs the critical pressure, T, of the natural gascIs the critical temperature of the natural gas.
Through the mass of calculating the natural gas in advance, can control the quality that the natural gas lets in, avoid causing the damage to the gasbag.
In a specific embodiment, the gas state equation is based on the existing gas state equation
Wherein M is the mass of the gas, M is the molar mass of the gas, R is the gas constant, Z is the gas compressibility,
where P isC、TCRespectively, the critical pressure and critical temperature of the gas. From this, the mass of gas stored in a certain space can be obtained:
thus, the injection of gas is stopped when the injected natural gas reaches the mass calculated above.
In a preferred embodiment, before injecting the natural gas into the air bag through the second pipeline, the method further includes:
injecting a marking substance into the air bag for prompting that the natural gas is completely produced when the natural gas is completely produced, wherein the marking substance is any one of the following substances: water, carbon dioxide, propane and butane. The marking substances are all liquid on the surface, carbon dioxide, propane and butane are all liquid under certain pressure, the part of liquid is at the bottom of the air bag, and when the natural gas in the air bag is completely produced, if pressure is applied again, the part of marking substances are outwards emitted to prompt that the natural gas is completely produced. Meanwhile, the marked substances are left at the bottom of the air bag, so that the air bag is prevented from being pressed into the second pipeline to damage the air bag when the natural gas is completely extracted.
When the natural gas in the air bag is extracted, if water or other liquid is filled in the air bag, external personnel can easily confirm that the natural gas in the air bag is completely extracted.
EXAMPLE III
Based on the same inventive concept, the embodiment of the invention also provides a method for producing gas by the salt cavern gas storage, which comprises the following steps: injecting air into the salt cavern cavity through a first pipeline; and extracting the natural gas in the air bag through a second pipeline to ensure that the air pressure in the salt cavern is not lower than the minimum operating pressure.
Wherein the minimum operating pressure is the lowest pressure for maintaining the long-term stability of the surrounding rock of the salt cavern gas storage.
In specific embodiments, there are at least three gas recovery modes as follows.
Firstly, injecting air into the salt cavity at a first air injection speed, and simultaneously extracting natural gas in the air bag at a first gas extraction speed. Wherein, the first gas injection speed is higher than the first gas production speed, and the pressure in the salt cavern cavity is kept unchanged.
The first is constant pressure gas production, the injected air quantity is equal to the produced natural gas quantity, the volume of the air bag is continuously reduced in the gas production process until the natural gas in the air bag is completely produced (at the moment, a small amount of natural gas is left in the air bag to prevent the air bag from being sucked into the second pipeline by air pressure). However, the gas in the air bag is less in amount and less in amount than the bottom gas in the existing salt cavern gas storage, so that the utilization rate of the gas in the air bag is still high compared with the existing bottom gas.
The second is variable pressure gas production, air is injected into the salt cavern cavity at a second gas injection speed, and meanwhile, natural gas in the air bag is produced at the second gas production speed, wherein the second gas injection speed is less than the second gas production speed;
when the pressure in the salt cavity is reduced to the minimum operation pressure, the natural gas in the air bag is suspended, and air is continuously injected into the salt cavity at a second gas injection speed;
when the pressure in the salt cavern cavity rises to the maximum operation pressure, the natural gas in the air bag is continuously extracted at the second gas extraction speed, the air is continuously injected into the salt cavern cavity at the second gas injection speed, and the pressure in the salt cavern cavity is kept to be not lower than the minimum operation pressure.
By adopting the second gas production mode, the gas production speed can be higher, and therefore, the gas production efficiency is higher.
The third is variable pressure gas production, air is injected into the salt cavern cavity at a second gas injection speed, and meanwhile, the natural gas in the air bag is produced at the second gas production speed, wherein the second gas injection speed is less than the second gas production speed;
and when the pressure in the salt cavern cavity is reduced to the minimum operating pressure, the natural gas in the air bag is produced at a third gas production speed, the third gas production speed is lower than the second gas injection speed, and the pressure in the salt cavern cavity is kept to be not lower than the minimum operating pressure.
And a third gas production mode is adopted, so that the natural gas can be produced uninterruptedly, and meanwhile, the gas production efficiency is higher.
By adopting any one of the gas production modes, the pressure in the salt cavern cavity can be ensured not to be lower than the minimum operation pressure, namely the long-term stability of the surrounding rock of the gas storage along the cavern is ensured. And compared with the existing salt cavern gas storage, the utilization rate of the natural gas is higher, and the waste of the natural gas cannot be caused.
If the air bag is damaged due to uncontrollable collapse of the wall of the salt cavern or other reasons in the gas production process, the natural gas in the air bag can be abandoned after being produced, specifically, the natural gas is injected into the salt cavern through the first pipeline, and the gas injection pressure is greater than the pressure of the stored gas in the air bag, so that the natural gas in the air bag is timely produced, the air bag is directly abandoned in the salt cavern, the ground does not need to be recovered, and the volume of the air bag can hardly be occupied after the air bag is compressed.
As shown in fig. 4, the change of the gas pressure in the salt cavern is shown in the whole process from the beginning of the cavity construction to the gas injection and halogen removal, to the injection of natural gas into the air bag and to the gas production from the air bag.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the salt cavern gas storage provided by the invention comprises a first pipeline arranged at the inlet of a salt cavern shaft, an air bag and a second pipeline arranged at the inlet of the air bag, wherein the air bag is positioned in a salt cavern cavity; the second pipeline is nested in the first pipeline, and a gap is reserved between the second pipeline and the first pipeline; the air of first preset pressure is stored in the salt cavern cavity, natural gas is injected into the air bag through the second pipeline, the air in the salt cavern cavity is discharged through a gap between the second pipeline and the first pipeline, so that the pressure in the salt cavern cavity reaches the maximum operation pressure, and the volume of the air bag reaches the maximum volume.
For example, a 1000m stratum has 20 ten thousand square salt caverns, the maximum operation pressure of the traditional salt cavern is 17Mpa, the minimum operation pressure is 7Mpa, wherein, the pressure difference of 10Mpa, namely 2000 ten thousand square gas storage capacity exists; however, in the salt cavern gas storage provided by the invention, assuming that the interlayer is very irregular such as a suspension, only two thirds of the volume of the salt cavern can be used as the inner difficulty, the volume of the inner container is about 13 ten thousand square, the natural gas in the inner container can be completely extracted, the pressure of 17Mpa is used as the working gas, and the storage capacity of 2210 ten thousand square is larger than that of the traditional salt cavern gas storage.
The invention can inflate the air bag even under the condition that bottom air is not needed, thereby improving the internal pressure of the stored air and ensuring that the operating pressure of the air storage is in the most stable state; and can regard as the constant pressure gas storage, the gas storage volume is big, and the risk is low, can avoid the huge risk that periodic pressure variation brought when the circulation is annotated and is produced gas.
And the air bag is adopted for storing air, so that the leakage risk can be reduced, and because the high-pressure air directly contacts with the salt cavern geology and is leaked even if slight leakage exists, the high-pressure air can be continuously supplemented to ensure the internal pressure of the cavity, and the safety of the cavity is ensured.
There is not brine at this salt cave intracavity, this chamber bottom do not contact with brine, can keep dry, need not to dewater again during gas production, consequently, compare in current side gas production mode, can practice thrift the cost more.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A salt cavern gas storage, comprising:
the air bag is positioned in a salt cavern, the salt cavern is positioned below the ground surface, air is stored in the salt cavern, and the air bag is used for storing natural gas;
a second pipeline, one end of which is connected with the air bag, and the other end of which is positioned above the ground surface, wherein the second pipeline is used for injecting the natural gas into the air bag or discharging the natural gas from the air bag;
the first pipeline is nested outside the second pipeline, one end of the first pipeline is connected with a shaft inlet of a salt cavern, the other end of the first pipeline is positioned on the surface of the ground, and the first pipeline is used for exhausting air from the salt cavern or injecting air into the salt cavern;
the air bag leakage monitoring device comprises a gas detector and an alarm;
the gas detector is arranged in a salt cave outside the air bag and used for detecting marked gas added in leaked natural gas when the air bag is damaged;
the alarm is connected with the gas detector through a wire, is arranged on the ground surface and is used for giving an alarm when the gas detector detects the indicating gas.
2. The salt cavern gas storage of claim 1, wherein a first valve is provided at an inlet of the first conduit and a second valve is provided at an inlet of the second conduit.
3. A method of injecting gas into a salt cavern gas storage as claimed in claim 1 or claim 2, comprising:
through the second pipeline to inject the natural gas into the gasbag, the air in the salt cave intracavity is through first pipeline is discharged, makes the pressure in the salt cave intracavity reaches maximum operating pressure, the volume of gasbag reaches maximum volume.
4. The method of claim 3, wherein prior to injecting natural gas into the envelope through the second conduit, further comprising:
specifically, the mass of the injected natural gas is obtained by the following formula:
wherein the content of the first and second substances,
wherein the mass of the injected natural gas, the molar mass of the natural gas, the volume of the air bag and the current maximum operating pressure of the salt cavern are included,
the compression coefficient of the natural gas is a constant of the natural gas, the current temperature of the natural gas, the critical pressure of the natural gas and the critical temperature of the natural gas.
5. The method of claim 3, wherein prior to injecting natural gas into the envelope through the second conduit, further comprising:
injecting a marking substance into the air bag for prompting that the natural gas is completely produced when the natural gas is completely produced;
the marking substance is specifically any one of the following substances: water, carbon dioxide, propane or butane.
6. A method of gas production in a salt cavern gas storage as claimed in claim 1 or 2, comprising:
injecting air into the salt cavern cavity through the first pipeline, and extracting natural gas in the air bag through the second pipeline to ensure that the air pressure in the salt cavern cavity is not lower than the minimum operating pressure.
7. The method of claim 6, wherein injecting air into the salt cavern through the first pipeline to extract natural gas from the bladder through the second pipeline comprises:
injecting air into the salt cavern cavity at a first gas injection speed, and simultaneously extracting natural gas in the air bag at a first gas extraction speed, wherein the first gas injection speed is equal to the first gas extraction speed.
8. The method of claim 6, wherein injecting air into the salt cavern through the first pipeline to extract natural gas from the bladder through the second pipeline comprises:
injecting air into the salt cavern cavity at a second gas injection speed, and simultaneously extracting natural gas in the air bag at a second gas extraction speed, wherein the second gas injection speed is less than the second gas extraction speed;
when the pressure in the salt cavern is reduced to the minimum operation pressure, the natural gas in the air bag is temporarily extracted, and air is continuously injected into the salt cavern at the second gas injection speed;
when the pressure in the salt cavern cavity rises to the maximum operation pressure, the natural gas in the air bag is continuously produced at the second gas production speed, air is continuously injected into the salt cavern cavity at the second gas injection speed, and the pressure in the salt cavern cavity is kept to be not lower than the minimum operation pressure.
9. The method of claim 8, wherein injecting air into the salt cavern through the first conduit extracts natural gas from the bladder through the second conduit, specifically comprising:
injecting air into the salt cavern cavity at the second gas injection speed, and simultaneously extracting natural gas in the air bag at the second gas extraction speed, wherein the second gas injection speed is less than the second gas extraction speed;
and when the pressure in the salt cavern cavity is reduced to the minimum operation pressure, extracting the natural gas in the air bag at a third gas extraction speed, wherein the third gas extraction speed is lower than the second gas injection speed, and the pressure in the salt cavern cavity is kept to be not lower than the minimum operation pressure.
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