CN112253118B - Gas injection and brine discharge device and method for salt cavern gas storage - Google Patents
Gas injection and brine discharge device and method for salt cavern gas storage Download PDFInfo
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- CN112253118B CN112253118B CN202011131078.9A CN202011131078A CN112253118B CN 112253118 B CN112253118 B CN 112253118B CN 202011131078 A CN202011131078 A CN 202011131078A CN 112253118 B CN112253118 B CN 112253118B
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- 238000002347 injection Methods 0.000 title claims abstract description 158
- 239000007924 injection Substances 0.000 title claims abstract description 158
- 239000012267 brine Substances 0.000 title claims abstract description 113
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 109
- 150000003839 salts Chemical class 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 163
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 52
- 150000002367 halogens Chemical class 0.000 claims abstract description 50
- 239000013049 sediment Substances 0.000 claims abstract description 39
- 238000007599 discharging Methods 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 230000000704 physical effect Effects 0.000 claims abstract description 5
- 239000000523 sample Substances 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 30
- 239000003345 natural gas Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 238000009933 burial Methods 0.000 claims description 2
- 241001131796 Botaurus stellaris Species 0.000 claims 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 abstract description 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 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 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 210000001320 hippocampus Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/20—Methods of underground mining; Layouts therefor for rock salt or potash salt
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Remote Sensing (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a gas injection and brine discharge device for a salt cavern gas storage, which comprises: the device comprises a sleeve, an air injection and halogen discharge inner pipe and an air injection and halogen discharge outer pipe; the gas injection and brine discharge outer pipe is arranged on the upper part of the salt cavern through a sleeve, the gas injection and brine discharge outer pipe is connected with the lower part of the sleeve through a packer, and the annular space between the sleeve on the upper part of the packer and the gas injection and brine discharge outer pipe is filled with annular space protection liquid. The gas injection and halogen removal method comprises the following steps: the method comprises the steps of measuring a cavity with a sonar, lowering a drill rod to probe the bottom, obtaining physical property parameters of sediment at the bottom of the cavity, determining the size and the brine discharge rate of an air-injection brine-discharge inner tube, analyzing stress of insoluble sediment particles near the orifice of the air-injection brine-discharge inner tube, determining the lower depths of the orifice of the air-injection brine-discharge inner tube and the orifice of an air-injection brine-discharge outer tube, lowering the air-injection brine-discharge outer tube and the inner tube, and injecting air and discharging brine. Compared with the prior art, the method is suitable for discharging brine of a salt cavern gas storage, salt cavern hydrogen storage, salt cavern gas compression energy storage and salt cavern oil storage; the method has the advantages of simple steps, clear parameters and strong operability, and can realize accurate control of gas injection and brine discharge of the salt cavern gas storage.
Description
Technical Field
The invention belongs to the field of oil and gas resource development, and particularly relates to a gas injection and brine discharge device and method for a salt cavern gas storage.
Background
Salt cavern gas storage is an important component of gas storage in China and has been built in Jintan Jiangsu, Huaian Jiangsu, Hippon Hippocampus Henan and the Yangtze river in Hubei. The gas injection and brine discharge is an important step for building the salt cavern gas storage, and comprises the steps of firstly, putting a gas injection and brine discharge outer pipe into a well completion sleeve to the top of a salt cavern cavity, and then putting a gas and brine discharge inner pipe into the gas injection and brine discharge outer pipe to the designed depth of the cavity bottom. Natural gas is injected into the salt cavern through an annular space between the gas injection and brine discharge outer pipe and the gas injection and brine discharge inner pipe, and the extruded brine is discharged through the gas injection and brine discharge inner pipe, so that the salt cavern gas storage is formed. The gas injection and the brine discharge are used as one of the main steps for building the salt cavern gas storage, and are directly related to the effective volume of the salt cavern solution cavity and the storage building period. The lower depth of the gas-injection and halogen-discharge inner pipe is reasonably determined in the gas-injection and halogen-discharge process, so that the amount of the discharged halogen water is increased, and the safety of the gas-injection and halogen-discharge construction is ensured. The depth under the gas injection and brine discharge inner pipe is too small, so that a large amount of brine cannot be discharged, and the effective gas storage volume of the salt cavern gas storage is reduced. The lower part of the gas injection and brine discharge inner pipe is too deep, which can cause insoluble sediments at the bottom of the salt cavern to be sucked into the gas injection and brine discharge inner pipe to cause the blockage of a pipe column. At present, the defects of undefined steps, uncertain parameters and the like mainly exist when the lower depth of a gas injection and brine discharge pipe column of a salt cavern gas storage is determined. First, the depth of the inner pipe for injecting gas and discharging brine of the existing salt cavern gas storage is generally determined according to experience. For example, the depth below the gas injection and halogen discharge inner tube of the gold jar salt cavern gas storage is generally 1.5-2.0 m from the pipe orifice of the gas injection and halogen discharge inner tube to the slag surface of insoluble substances at the bottom of the cavity. This empirical value was confirmed to be more conservative during the early gas injection and brine removal process of the gas storage in the jintan salt cavern. Due to the lack of scientific, reasonable and definite steps, the optimization of the distance between the orifice of the gas-injection and halogen-discharge inner tube and the sediment surface of insoluble substances at the bottom of the cavity is not easy. Secondly, there is no clear conclusion whether the empirical values of the jintan salt cavern gas reservoir are suitable for gas injection and brine discharge of other salt cavern gas reservoirs (e.g., jiangsu huai' an, hanshan river south, and subei river north). And thirdly, determining the lack of operability of the distance between the orifice of the gas injection and halogen removal inner pipe and the insoluble sediment surface at the bottom of the cavity for newly-built salt cavern gas storage. Fourthly, when the depth of the top surface of the insoluble sediment at the bottom of the salt cavern is determined, parameters are not clear, and two conditions based on sonar detection cavity data and drill rod bottom detection data exist, so that the field operability is poor.
Based on the reasons, the invention is urgently needed to provide a method for injecting gas and discharging brine of a salt cavern gas storage, solve the problems of lack of standard flow, unclear steps and parameters in the process of injecting gas and discharging brine of the existing salt cavern gas storage, and provide technical support for efficient and safe implementation of gas and brine injection of the salt cavern gas storage in China.
Disclosure of Invention
The invention provides a gas injection and brine discharge method for a salt cavern gas storage, aiming at the difficult problems that the gas injection and brine discharge process of the salt cavern gas storage is lack of standard processes, and the steps and parameters are not clear, so that the problems are solved, and the gas injection and brine discharge of the salt cavern gas storage can be performed according to the rules.
In order to realize the purpose, the invention adopts the following technical scheme:
salt cave gas storage annotates gas and arranges steamed device, includes: the device comprises a sleeve, an air injection and halogen discharge inner pipe and an air injection and halogen discharge outer pipe; wherein: the sleeve is put into the ground from the ground until the position of the sleeve shoe, the sleeve is connected with the top of the well neck, and the bottom of the well neck is connected with the top of the salt cavern; the gas injection and brine discharge outer pipe is arranged on the upper part of the salt cavern through a sleeve, the gas injection and brine discharge outer pipe is connected with the lower part of the sleeve through a packer, and an annular space between the sleeve on the upper part of the packer and the gas injection and brine discharge outer pipe is filled with annular space protection liquid; the top of the annulus between the sleeve and the gas injection and brine discharge outer pipe is provided with an annulus protection liquid injection port gate valve; the gas injection and brine discharge inner pipe is lowered to the position, close to the upper end face of insoluble substances sediments at the bottom of the salt cavern, of the lower part of the salt cavern through the gas injection and brine discharge outer pipe, a natural gas inlet gate valve is installed at the top of the annular space of the gas injection and brine discharge outer pipe and the gas injection and brine discharge inner pipe, and a brine outlet gate valve is installed at the top end of the gas injection and brine discharge inner pipe.
The brine discharge method of the brine discharge device by utilizing the gas injection of the salt cavern gas storage is characterized by comprising the following steps of:
s1, sonar cavity measurement;
s2, lowering a drill rod to probe the bottom;
s3, acquiring physical property parameters of the sediment at the cavity bottom;
s4, determining the size of the air injection and halogen discharge inner pipe and the halogen discharge rate;
s5, stress analysis is carried out on insoluble sediment particles near the pipe orifice of the gas injection and halogen discharge inner pipe;
s6, determining the lower depths of the pipe orifice of the gas injection and halogen discharge inner pipe and the pipe orifice of the gas injection and halogen discharge outer pipe;
s7, feeding an outer gas-injection and halogen-discharge pipe and an inner pipe;
s8, injecting gas and discharging halogen.
Compared with the prior art, the invention has the following beneficial effects: the method is suitable for discharging brine of a salt cavern gas storage, a salt cavern hydrogen storage, a salt cavern compressed gas energy storage and a salt cavern oil storage; the method has the advantages of simple steps, clear parameters and strong operability, and can realize accurate control of gas injection and brine discharge of the salt cavern gas storage.
Drawings
FIG. 1 is a schematic view of a gas injection and brine discharge device for a salt cavern gas storage;
in the figure: 1. a brine outlet gate valve; 2. a natural gas inlet gate valve; 3. an annular protection liquid injection port gate valve; 4. a sleeve; 5. an inner pipe for injecting gas and discharging halogen; 6. an annular space protection fluid; 7. a packer; 8. a casing shoe; 9. a well neck; 10. an outer gas-injection and brine-discharge pipe; 11. natural gas; 12. a gas-halogen interface; 13. brine; 14. salt holes; 15. designing a gas-halogen interface; 16. and settling insoluble substances.
Detailed Description
As shown in fig. 1, the gas injection and brine discharge device for the salt cavern gas storage comprises: a sleeve 4, an inner gas-injection and halogen-discharge pipe 5 and an outer gas-injection and halogen-discharge pipe 10; the sleeve 4 is put into the ground from the ground until the position of the sleeve shoe 8, the sleeve 4 is connected with the top of the well neck 9, and the bottom of the well neck 9 is connected with the top of the salt cavern 14; the gas injection and brine discharge outer pipe 10 is lowered to the upper part of the salt cavern 14 through the sleeve 4, the gas injection and brine discharge outer pipe 10 is connected with the lower part of the sleeve 4 through a packer 7, and the annulus between the sleeve 4 on the upper part of the packer 7 and the gas injection and brine discharge outer pipe 10 is filled with annulus protection liquid 6; the top of the annulus between the sleeve 4 and the gas-injection and halogen-discharge outer tube 10 is provided with an annulus protection liquid injection port gate valve 3; the gas injection and brine discharge inner pipe 5 is descended to the position of the lower part of the salt cavern 14 close to the upper end surface of the insoluble sediment 16 at the bottom of the salt cavern through the gas injection and brine discharge outer pipe 10; a natural gas inlet gate valve 2 is arranged at the top of the annular space of the gas injection and halogen discharge outer pipe 10 and the gas injection and halogen discharge inner pipe 5 and is used for controlling the entry of natural gas 11 in the gas injection and halogen discharge process; the brine outlet gate valve 1 is arranged at the top end of the gas injection and brine discharge inner pipe 5 and is used for controlling the discharge of brine 13; in the process of gas injection and brine discharge, natural gas 11 is injected from a natural gas inlet gate valve 2, injected into a well neck 9 and a salt cavern 14 along the annular space of a gas injection and brine discharge outer pipe 10 and a gas injection and brine discharge inner pipe 5, and drives brine 13 in the salt cavern to be discharged through a brine outlet gate valve 1 of the gas injection and brine discharge inner pipe 5; along with the increase of the injected natural gas, the gas-brine interface 12 formed by the natural gas and the brine in the salt cavern gradually moves downwards until the gas-brine interface 15 is designed, and the gas injection and brine discharge are finished.
The brine discharge method of the gas injection brine discharge device for the salt cavern gas storage comprises the following steps:
s1 Sonar cavity
A sonar cavity measuring instrument is put into the casing to the top of the salt cavern, the shape of the salt cavern is measured from top to bottom according to the requirements in technical specification of salt cavern gas storage sonar detection (Q/SY XQ 69-2006), and the shape of the sediment at the bottom of the salt cavern right below the casing is measured in an important way; sonar survey cavity acquisition parameters include: the top of the salt cavern is buried deeply, the bottom sediment surface of the salt cavern is buried deeply, the three-dimensional shape of the salt cavern, the volume of the salt cavern and the shape of the sediment surface of insoluble substances at the bottom of the salt cavern are formed; and (5) taking out the sonar cavity measuring equipment after the sonar cavity measuring is finished.
S2 bottom drilling rod bottom detection
A drill rod is put into the sleeve until the bottom of the salt cavern is detected, the drill rod is put into the sleeve until the drill rod cannot be put into the sleeve again by the weight of the drill rod, the putting-in depth of the drill rod is recorded, and the bottom depth of the salt cavern is calculated; comparing the depth of the salt cavern bottom obtained by the drill rod bottom detection with the depth of the salt cavern bottom obtained by the sonar cavity detection, and comprehensively determining the depth of the salt cavern bottom; and taking out the drill rod.
S3, obtaining physical property parameters of the sediment at the bottom of the cavity
Putting a sampling tool into the salt cavern bottom insoluble substance sediment particles for sampling, and analyzing to obtain physical parameters of the insoluble substance sediment particles, wherein the physical parameters comprise: chemical composition, component composition, different particle size content, density, shape and cementation state.
S4, determining the size of the inner pipe for injecting gas and discharging halogen and the halogen discharging rate
Comprehensively determining the size and the model of the gas injection and halogen discharge inner pipe and the gas injection and halogen discharge outer pipe according to the size of the sleeve, the ground brine processing capacity and the natural gas supply capacity, and preferably selecting the halogen discharge rate; according to the structural characteristics of the well body, the structures and the combination modes of the gas injection and brine discharge inner pipe and the gas injection and brine discharge outer pipe are determined.
S5 stress analysis of insoluble sediment particles near the pipe orifice of the gas-injection and halogen-discharge inner pipe
And establishing a theoretical and numerical model for stress calculation of the insoluble substance sediment particles near the pipe orifice of the gas-injection and halogen-discharge inner pipe according to the selected sizes of the gas-injection and halogen-discharge inner pipe and the gas-injection and halogen-discharge outer pipe, the gas-injection and halogen-discharge speed and the physical property parameters of the insoluble substance sediment particles, and obtaining the stress and motion rule of the insoluble substance sediment particles near the pipe orifice of the gas-injection and halogen-discharge inner pipe in the gas-injection and halogen-discharge process.
S6 determining the lower depth of the pipe orifice of the gas-injection and halogen-discharge inner pipe and the pipe orifice of the gas-injection and halogen-discharge outer pipe
According to the stress calculation result of insoluble sediment particles near the pipe orifice of the gas-injection and halogen-discharge inner pipe, determining the optimal distance between the pipe orifice of the gas-injection and halogen-discharge inner pipe and a sediment surface on the principle that the sediment particles are not allowed to be sucked into the gas-injection and halogen-discharge inner pipe; determining the depth of the bottom of a salt cavern and the optimal distance between the pipe orifice of the gas injection and halogen discharge inner pipe and the sediment surface by utilizing a sonar measuring cavity and a drill rod to detect the bottom, and determining the lower depth of the pipe orifice of the gas injection and halogen discharge inner pipe; and determining the lower depth of the mouth of the air-injection and brine-discharge outer pipe according to the salt cavern top burial depth obtained by the sonar cavity measurement.
S7, lower gas injection and halogen discharge outer pipe and inner pipe
Injecting gas and discharging brine into the casing until the determined depth of the opening of the gas and discharging brine outer pipe is reached; and injecting gas and discharging the halogen inner pipe into the gas-injection and discharging halogen outer pipe until the determined depth of the opening of the gas-injection and discharging halogen inner pipe is reached.
S8, injecting gas and discharging brine
Injecting natural gas into an annular space between the sleeve and the gas injection and brine discharge outer pipe according to the designed gas injection pressure and gas injection quantity, discharging brine in the salt cavern from the gas injection and brine discharge inner pipe until a gas and brine interface reaches the designed gas and brine interface position, finishing gas injection and brine discharge, and lifting the gas injection and brine discharge inner pipe and the gas injection and brine discharge outer pipe.
Therefore, the method can effectively solve the problems of lack of standard flow, undefined steps and parameters in the process of gas injection and brine discharge of the salt cavern gas storage, and has the advantages of clear operation steps and clear parameter value range.
Claims (4)
1. A method for discharging brine by using a gas injection and brine discharge device of a salt cavern gas storage, which adopts the gas injection and brine discharge device of the salt cavern gas storage, comprises the following steps: the device comprises a sleeve, an air injection and halogen discharge inner pipe and an air injection and halogen discharge outer pipe; the sleeve is put into the ground from the ground until the position of the sleeve shoe, the sleeve is connected with the top of the well neck, and the bottom of the well neck is connected with the top of the salt cavern; the gas injection and brine discharge outer pipe is arranged on the upper part of the salt cavern through a sleeve, the gas injection and brine discharge outer pipe is connected with the lower part of the sleeve through a packer, and an annular space between the sleeve on the upper part of the packer and the gas injection and brine discharge outer pipe is filled with annular space protection liquid; an annular protection liquid filling port gate valve is arranged at the top of an annular space between the sleeve and the gas injection and halogen discharge outer pipe; the gas injection and brine discharge inner pipe is lowered to the position, close to the upper end face of insoluble sediment at the bottom of the salt cavern, of the lower part of the salt cavern through the gas injection and brine discharge outer pipe, the top of the annular space of the gas injection and brine discharge outer pipe and the gas injection and brine discharge inner pipe is provided with a natural gas inlet gate valve, and a brine outlet gate valve is arranged at the top end of the gas injection and brine discharge inner pipe; the method comprises the following steps:
s1, sonar cavity measurement;
s2, lowering a drill rod to probe the bottom;
s3, acquiring physical property parameters of the sediment at the cavity bottom;
s4, determining the size of the air injection and halogen discharge inner pipe and the halogen discharge rate;
s5, stress analysis is carried out on insoluble sediment particles near the pipe orifice of the gas injection and halogen discharge inner pipe;
s6, determining the lower depths of the pipe orifice of the gas injection and halogen discharge inner pipe and the pipe orifice of the gas injection and halogen discharge outer pipe;
s7, feeding an outer gas-injection and halogen-discharge pipe and an inner pipe;
s8, injecting gas and discharging halogen;
s1 the method comprises placing a sonar cavity measuring instrument in the casing to the top of the salt cavern, measuring the shape of the salt cavern from top to bottom according to the requirements of technical Specification for sonar detection in salt cavern gas storage (Q/SY XQ 69-2006), and measuring the shape of the sediment at the bottom of the salt cavern under the casing; sonar survey cavity acquisition parameters include: the top of the salt cavern is buried deeply, the bottom sediment surface of the salt cavern is buried deeply, the three-dimensional shape of the salt cavern, the volume of the salt cavern and the shape of the sediment surface of insoluble substances at the bottom of the salt cavern are formed; lifting out the sonar cavity measuring equipment after the sonar cavity measuring is finished;
s2, specifically, a drill rod is put into the casing to the bottom of the salt cavern for bottom detection until the drill rod cannot be put into the casing again by the weight of the drill rod, the putting-in depth of the drill rod is recorded, and the bottom depth of the salt cavern is calculated; comparing the depth of the salt cavern bottom obtained by the drill rod bottom detection with the depth of the salt cavern bottom obtained by the sonar cavity detection, and comprehensively determining the depth of the salt cavern bottom; taking out the drill rod;
s3 the concrete method is that a sampling tool is put in to sample the insoluble sediment particles at the bottom of the salt cavern, and the physical parameters of the insoluble sediment particles are obtained by analysis, which comprises the following steps: chemical composition, component composition, different particle size content, density, shape and cementation state;
s4, according to the size of the sleeve, the ground brine processing capacity and the natural gas supply capacity, comprehensively determining the size and the model of the gas injection and brine discharge inner pipe and the gas injection and brine discharge outer pipe, and preferably selecting the brine discharge rate; determining the structures and the combination modes of the gas injection and brine discharge inner pipe and the gas injection and brine discharge outer pipe according to the structural characteristics of the well body;
s5 the method comprises the following steps of establishing a theoretical and numerical model for stress calculation of the insoluble sediment particles near the orifice of the gas injection and halogen discharge inner tube according to the selected sizes of the gas injection and halogen discharge inner tube and the gas injection and halogen discharge outer tube, the gas injection and halogen discharge rate and the physical parameters of the insoluble sediment particles, and obtaining the stress and motion rules of the insoluble sediment particles near the orifice of the gas injection and halogen discharge inner tube in the gas injection and halogen discharge process.
2. The method for discharging brine of the gas injection and discharge device of the salt cavern gas storage as claimed in claim 1, wherein the method comprises the following steps: s6, according to the calculation result of the stress of the insoluble sediment particles near the nozzle of the gas-injection and halogen-discharge inner tube, determining the optimal distance between the nozzle of the gas-injection and halogen-discharge inner tube and the sediment surface on the principle that the sediment particles are not allowed to be sucked into the gas-injection and halogen-discharge inner tube; determining the depth of the bottom of a salt cavern and the optimal distance between the pipe orifice of the gas injection and halogen discharge inner pipe and the sediment surface by utilizing a sonar measuring cavity and a drill rod to detect the bottom, and determining the lower depth of the pipe orifice of the gas injection and halogen discharge inner pipe; and determining the lower depth of the mouth of the air-injection and brine-discharge outer pipe according to the salt cavern top burial depth obtained by the sonar cavity measurement.
3. The brine discharge method of the gas injection and brine discharge device for the salt cavern gas storage as claimed in claim 2, wherein the method comprises the following steps: s7, injecting gas and discharging bittern from the casing to the depth below the mouth of the above-mentioned outer pipe; and injecting gas and discharging the halogen inner pipe into the gas-injection and discharging halogen outer pipe until the determined depth of the opening of the gas-injection and discharging halogen inner pipe is reached.
4. The method for discharging brine in the gas injection and brine discharge device of the salt cavern gas storage as claimed in any one of claims 2 to 3, wherein the method comprises the following steps: and S8, injecting natural gas into the annular space between the sleeve and the outer gas-injection and brine-discharge pipe according to the designed gas-injection pressure and gas-injection quantity, discharging brine in the salt cavern from the inner gas-injection and brine-discharge pipe until the gas-brine interface reaches the designed gas-brine interface position, completing gas-injection and brine-discharge, and taking out the inner gas-injection and brine-discharge pipe and the outer gas-injection and brine-discharge pipe.
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| CN114856507B (en) * | 2021-02-04 | 2024-03-01 | 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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| CN113670403B (en) * | 2021-09-09 | 2024-04-02 | 山东鲁银盐穴储能工程技术有限公司 | Salt cavern cavity shape measurement method |
| CN114293966B (en) * | 2022-01-06 | 2024-01-16 | 山东鲁银盐穴储能工程技术有限公司 | Clear space inversion method in sediment filling cavity |
| CN114439452B (en) * | 2022-01-28 | 2022-11-01 | 中国石油大学(北京) | Pipe string device for discharging brine from sediment gap of salt cavern gas storage and brine discharging method |
| CN114991717B (en) * | 2022-05-10 | 2023-03-21 | 中国科学院武汉岩土力学研究所 | Pressure-maintaining gas-injection brine-discharging device and method for salt cavern gas storage |
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| CN117470734B (en) * | 2023-10-26 | 2024-10-18 | 中国科学院武汉岩土力学研究所 | Salt cavern helium storage sediment permeability and fine particle migration testing device and testing method |
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|---|---|---|---|---|
| CN105239965B (en) * | 2015-10-14 | 2019-04-12 | 中国石油天然气集团公司 | Halogen method is arranged in salt hole air reserved storeroom gas injection |
| CN106930728B (en) * | 2015-12-30 | 2019-05-07 | 中国石油天然气股份有限公司 | Gas injection and brine discharge method and device for salt cavern gas storage |
| CN207728393U (en) * | 2017-12-11 | 2018-08-14 | 中盐金坛盐化有限责任公司 | The casing programme of chamber is made for salt hole air reserved storeroom |
| CN110306951B (en) * | 2019-07-05 | 2020-10-23 | 中国科学院武汉岩土力学研究所 | Method for replacing bottom-laying natural gas of U-shaped salt cavern gas storage |
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2020
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