CN114991717A - Pressure-maintaining gas-injection brine-discharging device and method for salt cavern gas storage - Google Patents
Pressure-maintaining gas-injection brine-discharging device and method for salt cavern gas storage Download PDFInfo
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- CN114991717A CN114991717A CN202210509253.6A CN202210509253A CN114991717A CN 114991717 A CN114991717 A CN 114991717A CN 202210509253 A CN202210509253 A CN 202210509253A CN 114991717 A CN114991717 A CN 114991717A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 70
- 238000007599 discharging Methods 0.000 title claims abstract description 58
- 238000002347 injection Methods 0.000 title claims abstract description 51
- 239000007924 injection Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000012267 brine Substances 0.000 claims abstract description 218
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 215
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 126
- 239000007789 gas Substances 0.000 claims abstract description 87
- 239000003345 natural gas Substances 0.000 claims abstract description 64
- 238000011001 backwashing Methods 0.000 claims abstract description 20
- 241001131796 Botaurus stellaris Species 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 6
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 229910052736 halogen Inorganic materials 0.000 description 10
- 150000002367 halogens Chemical class 0.000 description 10
- 239000011435 rock Substances 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- MPDGHEJMBKOTSU-YKLVYJNSSA-N 18beta-glycyrrhetic acid Chemical compound C([C@H]1C2=CC(=O)[C@H]34)[C@@](C)(C(O)=O)CC[C@]1(C)CC[C@@]2(C)[C@]4(C)CC[C@@H]1[C@]3(C)CC[C@H](O)C1(C)C MPDGHEJMBKOTSU-YKLVYJNSSA-N 0.000 description 1
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
A pressure-maintaining gas-injection brine-discharging device and method for a salt cavern gas storage are disclosed, wherein the device comprises: the natural gas brine discharging device comprises a natural gas input assembly, a brine output assembly, a first brine discharging assembly, a second brine discharging assembly, a back washing assembly, a flowmeter and a pressure gauge. The pressure-maintaining gas-injection and brine-discharging device and method for the salt cavern gas storage can realize the increase of the natural gas pressure in the cavity of the salt cavern gas storage in the gas-injection and brine-discharging process, and are favorable for the safe construction in the gas-injection and brine-discharging process of the salt cavern gas storage.
Description
Technical Field
The invention belongs to the technical field of salt cavern gas storage, and particularly relates to a pressure-maintaining gas-injection brine-discharging device and method for the salt cavern gas storage.
Background
The salt rock becomes an ideal medium for projects such as petroleum, natural gas storage, compressed air energy storage and the like due to low permeability, good creep property and damage self-repairing performance of the salt rock. At present, the construction of salt cavern type gas storage is developed in the fields of Jiangsu Jintan, Jiangsu Huaian, Henan flattop mountain, Hubei Xinjiang and the like in China. In the construction of salt cavern gas storage, gas injection and brine discharge are one of very important steps, and are directly related to the effective volume of a salt cavern cavity and the storage construction period. In the process of gas injection and halogen discharge, if the gas pressure in the cavity is too low or the pressure fluctuation is too high, serious production safety accidents caused by shearing or stretching damage of surrounding rocks can occur. For example, in the process of gas injection and brine discharge, the internal pressure of the cavity is too low, which may cause accidents such as large-area collapse of the top plate, and further cause serious consequences such as damage of the gas injection and brine discharge pipe column and leakage of natural gas. Therefore, in order to prevent safety accidents caused by too small internal pressure of the cavity or pressure fluctuation in the cavity, the stable high pressure in the cavity needs to be maintained in the processes of gas injection and halogen discharge.
However, the existing gas injection and halogen removal processes cannot well ensure the achievement of the above purpose.
Disclosure of Invention
In view of the above problems, the present invention provides a pressure-maintaining gas-injecting and brine-discharging device and method for a salt cavern gas storage, which overcome or at least partially solve the above problems.
In order to solve the technical problem, the invention provides a pressure-maintaining gas-injecting brine-discharging device for a salt cavern gas storage, which comprises:
the natural gas input assembly is used for inputting natural gas into the salt cavern gas storage; the first end of the natural gas input assembly is connected with natural gas, and the second end of the natural gas input assembly is inserted into the salt cavern gas storage;
the brine output assembly is used for outputting brine in the salt cavern gas storage; the first end of the brine output assembly is inserted into the salt cavern gas storage;
the first brine discharge assembly is used for discharging brine output by the brine output assembly to a salt chemical industry enterprise; the first end of the first brine discharge assembly is connected with the second end of the brine output assembly;
the back washing component is used for back washing the inside of the brine output component; the first end of the backwashing component is connected with the second end of the brine output component, and the second end of the backwashing component is connected with clean water;
the flow meter is used for detecting the flow of brine passing through the first brine discharge assembly; the flow meter is arranged on the first brine discharge assembly;
the pressure gauge is used for detecting the pressure value of brine in the brine output assembly; the pressure gauge is arranged at the second end of the brine output assembly.
Preferably, the natural gas input assembly comprises: the natural gas inlet gate valve comprises a natural gas input pipe and a natural gas inlet gate valve, wherein the first end of the natural gas input pipe is connected with natural gas, the second end of the natural gas input pipe is inserted into the salt cavern gas storage, and the natural gas inlet gate valve is arranged on the natural gas input pipe.
Preferably, the brine output assembly comprises: the brine discharging pipe column and the brine outlet gate valve, wherein the first end of the brine discharging pipe column is inserted into the salt cavern gas storage, the second end of the brine discharging pipe column is connected with the first end of the first brine discharging assembly, and the brine outlet gate valve is arranged on the brine discharging pipe column.
Preferably, the first halogen discharging assembly comprises: first row of bittern pipe, first row of bittern gate valve and first row of bittern back pressure valve, wherein, the first end of first row of bittern pipe is connected the second end of bittern output subassembly, the manometer set up in arrange the second end of bittern pipe post in the bittern output subassembly, the flowmeter set up in on the first row of bittern pipe, first row of bittern gate valve with first row of bittern back pressure valve all set up in on the first row of bittern pipe, first row of bittern gate valve is located the flowmeter with between the manometer, first row of bittern back pressure valve is located first row of bittern gate valve with between the flowmeter.
Preferably, the backwash assembly comprises: the brine output assembly comprises a backwash pipe, a backwash gate valve and a backwash back pressure valve, wherein the first end of the backwash pipe is connected with the second end of the brine output assembly, the second end of the backwash pipe is connected with backwash fluid, the backwash gate valve and the backwash back pressure valve are arranged on the backwash pipe, the backwash gate valve is located between the second end of the brine output assembly and the second end of the backwash pipe, and the backwash back pressure valve is located between the backwash gate valve and the second end of the backwash pipe.
Preferably, the backwash assembly further comprises: a water injection pump disposed on the backwash pipe.
Preferably, the water injection pump is located between the backwash back pressure valve and the second end of the backwash pipe.
Preferably, the method further comprises the following steps: the second brine discharge assembly is used for discharging brine output by the brine output assembly to a salt chemical industry enterprise; the second brine discharge assembly is connected with the first brine discharge assembly in parallel, and the flow meter is further used for detecting the flow of brine passing through the second brine discharge assembly.
Preferably, the second brine discharge assembly comprises: the first end of the second brine discharge pipe is connected with the first end of the first brine discharge pipe, the second end of the second brine discharge pipe is connected with the first brine discharge pipe, the joint of the first brine discharge pipe and the flowmeter is located, the second brine discharge gate valve and the second brine discharge backpressure valve are arranged on the second brine discharge pipe, the second brine discharge gate valve is located between the flowmeter and the pressure gauge, and the second brine discharge backpressure valve is located between the second brine discharge gate valve and the flowmeter.
The application also provides a pressure-maintaining gas-injection brine-discharging method for the salt cavern gas storage, which is realized based on the pressure-maintaining gas-injection brine-discharging device for the salt cavern gas storage, and comprises the following steps:
determining a threshold pressure of a first blowdown back pressure valve in a first blowdown assembly;
performing pressure maintaining, gas injection and brine discharge through the natural gas input assembly, the brine output assembly and the first brine discharge assembly;
the brine output assembly is backwashed through a backwashing assembly;
and continuously performing pressure maintaining gas injection and brine discharge through the natural gas input assembly, the brine output assembly and the first brine discharge assembly until the gas injection and brine discharge are finished.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: the pressure-maintaining gas-injection brine-discharging device and method for the salt cavern gas storage can increase the pressure of natural gas in the cavity of the salt cavern gas storage, and are favorable for safe construction in the gas-injection brine-discharging process of the salt cavern gas storage.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic overall view of a pressure-maintaining, gas-injecting and brine-discharging device for a salt cavern gas storage provided in an embodiment of the invention;
FIG. 2 is a schematic flow chart of a method for discharging brine by injecting gas under pressure in a salt cavern gas storage provided by an embodiment of the invention;
wherein the reference numerals are respectively:
1-natural gas inlet gate valve; 2-brine outlet gate valve; 3-back flushing gate valve; 4-back flushing back pressure valve; 5, a water injection pump; 6, discharging halogen; 7-first row of halogen gate valves; 8-first brine discharge back pressure valve; 9-second row of brine gate valves; 10-second brine discharge back pressure valve; 11-a flow meter; 12-pressure gauge.
Detailed Description
The present invention will be specifically explained below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly presented thereby. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as meaning commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
Referring to fig. 1, in an embodiment of the present application, the present invention provides a pressure-maintaining gas-injection and brine-removal device for a salt cavern gas storage, including:
the natural gas input assembly is used for inputting natural gas into the salt cavern gas storage; the first end of the natural gas input assembly is connected with natural gas, and the second end of the natural gas input assembly is inserted into the salt cavern gas storage;
the brine output assembly is used for outputting brine in the salt cavern gas storage; the first end of the brine output assembly is inserted into the salt cavern gas storage;
the first brine discharge assembly is used for discharging brine output by the brine output assembly to a salt chemical industry enterprise; the first end of the first brine discharge assembly is connected with the second end of the brine output assembly;
the back washing component is used for back washing the inside of the brine output component; the first end of the backwashing component is connected with the second end of the brine output component, and the second end of the backwashing component is connected with clean water;
a flow meter 11 for detecting the flow of brine passing through the first brine discharge assembly; the flow meter 11 is arranged on the first brine discharge assembly;
the pressure gauge 12 is used for detecting the brine pressure value in the brine output assembly; the pressure gauge 12 is arranged at the second end of the brine output assembly.
When the pressure-maintaining, gas-injecting and brine-discharging device of the salt cavern gas storage works, the threshold pressure of a first brine discharge backpressure valve 8 in a first brine discharge assembly is determined, and then pressure-maintaining, gas-injecting and brine-discharging are carried out through a natural gas input assembly, a brine output assembly and the first brine discharge assembly; then, carrying out back washing on the brine output assembly through a back washing assembly; and finally, the natural gas input assembly, the brine output assembly and the first brine discharge assembly are used for pressure maintaining, gas injection and brine discharge until the gas injection and brine discharge are finished.
As shown in fig. 1, in the embodiment of the present application, the natural gas input assembly includes: the natural gas import gate valve 1, wherein, the first end of natural gas input pipe is connected the natural gas and the second end is inserted in the salt cavern gas storage, natural gas import gate valve 1 set up in on the natural gas input pipe.
In this application embodiment, natural gas import gate valve 1 can control switching on and closing of natural gas input pipe.
As shown in fig. 1, in the present embodiment, the brine output assembly includes: a brine discharge pipe column 6 and a brine outlet gate valve 2, wherein the first end of the brine discharge pipe column 6 is inserted into the salt cavern gas storage, the second end of the brine discharge pipe column is connected with the first end of the first brine discharge component, and the brine outlet gate valve 2 is arranged on the brine discharge pipe column 6.
In this application embodiment, when the natural gas increases in the salt cavern gas reservoir, brine discharges through arranging brine tubular column 6, and switching on and closing of arranging brine tubular column 6 can be controlled to brine outlet gate valve 2 to the break-make of output brine in the control follows the salt cavern gas reservoir.
As shown in fig. 1, in the embodiment of the present application, the first halogen discharging assembly includes: first row of bittern pipe, first row of bittern gate valve 7 and first row of bittern back pressure valve 8, wherein, the first end of first row of bittern pipe is connected bittern output assembly's second end, manometer 12 set up in arrange the second end of bittern tubular column 6 in the bittern output assembly, flowmeter 11 set up in on the first row of bittern pipe, first row of bittern gate valve 7 with first row of bittern back pressure valve 8 all set up in on the first row of bittern pipe, first row of bittern gate valve 7 is located flowmeter 11 with between the manometer 12, first row of bittern back pressure valve 8 is located first row of bittern gate valve 7 with between the flowmeter 11.
Referring to fig. 1, in the embodiment of the present application, the backwash assembly includes: the brine discharge device comprises a backwash pipe, a backwash gate valve 3 and a backwash back pressure valve 4, wherein the first end of the backwash pipe is connected with the second end of the brine discharge assembly, the second end of the backwash pipe is connected with clean water, the backwash gate valve 3 and the backwash back pressure valve 4 are arranged on the backwash pipe, the backwash gate valve 3 is located between the second end of the brine discharge assembly and the second end of the backwash pipe, and the backwash back pressure valve 4 is located between the backwash gate valve 3 and the second end of the backwash pipe.
In the embodiment of the application, the pressure of clean water in the backwash pipe can be set through the backwash back pressure valve 4, and the backwash gate valve 3 can control the on-off of the backwash pipe, so that the on-off of the backwash process is controlled.
As shown in fig. 1, in the embodiment of the present application, the backwash assembly further includes: and the water injection pump 5 is arranged on the backwashing pipe.
In the present embodiment, the water injection pump 5 is used to drive the fresh water in the backwash pipe in a predetermined direction.
In the present embodiment, the water injection pump 5 is located between the backwash back pressure valve 4 and the second end of the backwash pipe, as shown in fig. 1.
Referring to fig. 1, in the embodiment of the present application, the pressure-maintaining, gas-injecting and brine-discharging device for a salt cavern gas storage provided by the present invention further includes: the second brine discharge assembly is used for discharging brine output by the brine output assembly to a salt chemical industry enterprise; the second brine discharge assembly is connected with the first brine discharge assembly in parallel, and the flow meter is further used for detecting the flow of brine passing through the second brine discharge assembly.
In the embodiment of the application, when the first brine discharge assembly fails, the second brine discharge assembly can be started for discharging brine.
In the embodiment of the present application, as shown in fig. 1, the second halogen discharging assembly includes: a second brine discharge pipe, a second brine discharge gate valve 9 and a second brine discharge back pressure valve 10, wherein the first end of the second brine discharge pipe is connected with the first end of the first brine discharge pipe, the second end of the second brine discharge pipe is connected with the first brine discharge pipe, the connection position is between the first brine discharge back pressure valve 8 and the flowmeter 11, the second brine discharge gate valve 9 and the second brine discharge back pressure valve 10 are both arranged on the second brine discharge pipe, the second brine discharge gate valve 9 is positioned between the flowmeter 11 and the pressure gauge 12, and the second brine discharge back pressure valve 10 is positioned between the second brine discharge gate valve 9 and the flowmeter 11.
In this application embodiment, can control the pressure of the interior brine of second row of steamed pipe through second row of steamed back pressure valve 10, and the switching on and closing of second row of steamed pipe can be controlled to second row of steamed gate valve 9 to the break-make of arranging the steamed in the control second row of steamed pipe.
As shown in fig. 2, in the embodiment of the present application, the present application further provides a pressure-maintaining, gas-injecting and brine-discharging method for a salt cavern gas storage, which is implemented based on the pressure-maintaining, gas-injecting and brine-discharging device for a salt cavern gas storage as described in the foregoing, and the method includes the steps of:
s1: determining a threshold pressure of a first blowdown back pressure valve in a first blowdown assembly;
specifically, the area, the shape and the span of a salt cavern top plate are measured by using sonar, and then sonar cavity measurement equipment is taken out after cavity measurement is finished; according to the salt cavern cavity condition and the surrounding rock physical and mechanical properties measured by sonar, calculating the minimum pressure P1 of natural gas in the cavity; calculating to obtain the minimum pressure P2 at the brine outlet according to the minimum pressure P1 of natural gas in the cavity, the depth of gas-liquid interface of gas injection and brine discharge, the frictional resistance in the pipe and the like; the threshold pressure P3 of the first back pressure valve 8 for brine discharge is determined taking into account the minimum pressure at the brine outlet and the minimum flow of brine discharge.
S2: the natural gas input assembly, the brine output assembly and the first brine discharge assembly are used for pressure maintaining, gas injection and brine discharge;
specifically, threshold pressures of a first brine discharge back pressure valve 8 and a second brine discharge back pressure valve 10 are set as initial values P3, then a natural gas inlet gate valve 1, a brine outlet gate valve 2 and a first brine discharge gate valve 7 are opened, natural gas is injected into an annular space in a gas injection and brine discharge outer pipe according to designed gas injection pressure and gas injection quantity, and brine in a salt cavern is discharged from a brine discharge pipe column 6. Observing the pressure P4 indicated by the pressure gauge 12, and if P4 is more than or equal to P2, keeping the threshold pressure of the first brine discharge backpressure valve 8 unchanged; if P4< P2, the threshold pressure of the first exhaust halogen back pressure valve 8 is increased until P4 ≧ P2.
At this moment, if the first row of steamed subassembly trouble, then close first row of steamed gate valve 7, overhaul first row of steamed subassembly, open the steamed gate valve 9 of second row simultaneously, arrange steamed subassembly through the second and carry out the work of annotating gas and arranging steamed, effectively avoid the time limit for a project delay.
S3: the brine output assembly is backwashed through a backwashing assembly;
specifically, in order to prevent the crystallization of the column 6 from being blocked, the column 6 is backwashed every day during the gas injection and halogen discharge. Specifically, when flushing, stopping gas injection, closing the natural gas inlet gate valve 1, closing the first row of brine discharge gate valve 7 and the second row of brine discharge gate valve 9, and setting the threshold pressure of the back-flushing back pressure valve 4 to be P2, so that high pressure in the cavity can be still maintained in the gas injection and brine discharge process. Then opening a brine outlet gate valve 2 and a back-flushing gate valve 3, starting a water injection pump 5, injecting clear water into the brine discharge pipe column 6, and performing back-flushing on the brine discharge pipe column 6 until the brine discharge pipe column 6 is smooth. The water injection pump 5 and the back-flush gate valve 3 are then closed.
S4: and continuously performing pressure maintaining gas injection and brine discharge through the natural gas input assembly, the brine output assembly and the first brine discharge assembly until the gas injection and brine discharge are finished.
Specifically, the natural gas inlet gate valve 1, the brine outlet gate valve 2 and the first brine discharge gate valve 7 are opened, and the gas injection and brine discharge work is continued until the gas-brine interface reaches the designed gas-brine interface position, so that the gas injection and brine discharge are completed.
The pressure-maintaining gas-injection brine-discharging device and method for the salt cavern gas storage can increase the pressure of natural gas in the cavity of the salt cavern gas storage, and are favorable for safe construction in the gas-injection brine-discharging process of the salt cavern gas storage.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modifications, equivalents, improvements and the like which are made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. The utility model provides a salt cavern gas storage pressurize gas injection row bittern device which characterized in that includes:
the natural gas input assembly is used for inputting natural gas into the salt cavern gas storage; the first end of the natural gas input assembly is connected with natural gas, and the second end of the natural gas input assembly is inserted into the salt cavern gas storage;
the brine output assembly is used for outputting brine in the salt cavern gas storage; the first end of the brine output assembly is inserted into the salt cavern gas storage;
the first brine discharge assembly is used for discharging the brine output by the brine output assembly to a salt chemical industry enterprise; the first end of the first brine discharge assembly is connected with the second end of the brine output assembly;
the back washing component is used for back washing the inside of the brine output component; the first end of the backwashing component is connected with the second end of the brine output component, and the second end of the backwashing component is connected with clean water;
the flow meter is used for detecting the flow of brine passing through the first brine discharge assembly; the flow meter is arranged on the first bittern discharge assembly;
the pressure gauge is used for detecting the pressure value of brine in the brine output assembly; the pressure gauge is arranged at the second end of the brine output assembly.
2. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage according to claim 1, wherein the natural gas input assembly comprises: the natural gas inlet gate valve comprises a natural gas input pipe and a natural gas inlet gate valve, wherein the first end of the natural gas input pipe is connected with natural gas, the second end of the natural gas input pipe is inserted into the salt cavern gas storage, and the natural gas inlet gate valve is arranged on the natural gas input pipe.
3. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage, according to claim 1, wherein the brine output assembly comprises: the brine discharging pipe column and the brine outlet gate valve, wherein the first end of the brine discharging pipe column is inserted into the salt cavern gas storage, the second end of the brine discharging pipe column is connected with the first end of the first brine discharging assembly, and the brine outlet gate valve is arranged on the brine discharging pipe column.
4. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage according to claim 1, wherein the first brine-discharging assembly comprises: first row of bittern pipe, first row of bittern gate valve and first row of bittern back pressure valve, wherein, the first end of first row of bittern pipe is connected the second end of bittern output subassembly, the manometer set up in arrange the second end of bittern pipe post in the bittern output subassembly, the flowmeter set up in on the first row of bittern pipe, first row of bittern gate valve with first row of bittern back pressure valve all set up in on the first row of bittern pipe, first row of bittern gate valve is located the flowmeter with between the manometer, first row of bittern back pressure valve is located first row of bittern gate valve with between the flowmeter.
5. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage as claimed in claim 1, wherein the back-flushing assembly comprises: the brine output assembly comprises a backwash pipe, a backwash gate valve and a backwash back pressure valve, wherein the first end of the backwash pipe is connected with the second end of the brine output assembly, the second end of the backwash pipe is connected with clean water, the backwash gate valve and the backwash back pressure valve are arranged on the backwash pipe, the backwash gate valve is located between the second end of the brine output assembly and the second end of the backwash pipe, and the backwash back pressure valve is located between the backwash gate valve and the second end of the backwash pipe.
6. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage according to claim 5, wherein the back-flushing assembly further comprises: and the water injection pump is arranged on the backwashing pipe.
7. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage as claimed in claim 6, wherein the water injection pump is located between the back-flushing back-pressure valve and the second end of the back-flushing pipe.
8. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage according to claim 4, further comprising: the second brine discharge assembly is used for discharging brine output by the brine output assembly to a salt chemical industry enterprise; the second brine discharge assembly is connected with the first brine discharge assembly in parallel, and the flow meter is further used for detecting the flow of brine passing through the second brine discharge assembly.
9. The pressure-maintaining, gas-injecting and brine-discharging device for the salt cavern gas storage as claimed in claim 8, wherein the second brine-discharging assembly comprises: the first end of the second brine discharge pipe is connected with the first end of the first brine discharge pipe, the second end of the second brine discharge pipe is connected with the first brine discharge pipe, the joint of the first brine discharge pipe and the flowmeter is located, the second brine discharge gate valve and the second brine discharge backpressure valve are arranged on the second brine discharge pipe, the second brine discharge gate valve is located between the flowmeter and the pressure gauge, and the second brine discharge backpressure valve is located between the second brine discharge gate valve and the flowmeter.
10. A pressure-maintaining gas-injecting and brine-discharging method for a salt cavern gas storage, which is realized based on the pressure-maintaining gas-injecting and brine-discharging device for the salt cavern gas storage as claimed in any one of claims 1 to 9, and comprises the following steps:
determining a threshold pressure of a first blowdown back pressure valve in a first blowdown assembly;
the natural gas input assembly, the brine output assembly and the first brine discharge assembly are used for pressure maintaining, gas injection and brine discharge;
the brine output assembly is backwashed through a backwashing assembly;
and continuing to perform pressure maintaining gas injection and brine discharge through the natural gas input assembly, the brine output assembly and the first brine discharge assembly until the gas injection and brine discharge are finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210509253.6A CN114991717B (en) | 2022-05-10 | 2022-05-10 | Pressure-maintaining gas-injection brine-discharging device and method for salt cavern gas storage |
Applications Claiming Priority (1)
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