CN111852565B - Method for discharging brine in accumulated residues at bottom and communication section of salt cavity of old well cavity - Google Patents
Method for discharging brine in accumulated residues at bottom and communication section of salt cavity of old well cavity Download PDFInfo
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- CN111852565B CN111852565B CN201910348084.0A CN201910348084A CN111852565B CN 111852565 B CN111852565 B CN 111852565B CN 201910348084 A CN201910348084 A CN 201910348084A CN 111852565 B CN111852565 B CN 111852565B
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- 239000012267 brine Substances 0.000 title claims abstract description 114
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 114
- 150000003839 salts Chemical class 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000004891 communication Methods 0.000 title claims abstract description 43
- 238000007599 discharging Methods 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 57
- 238000002347 injection Methods 0.000 claims abstract description 50
- 239000007924 injection Substances 0.000 claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 claims abstract description 42
- 238000003860 storage Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 239000003345 natural gas Substances 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000013461 design Methods 0.000 claims abstract description 4
- 238000003801 milling Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 2
- 239000012139 lysis buffer Substances 0.000 claims 2
- 235000002639 sodium chloride Nutrition 0.000 description 52
- 239000000126 substance Substances 0.000 description 9
- 239000011435 rock Substances 0.000 description 7
- 238000000605 extraction Methods 0.000 description 6
- 238000005065 mining Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 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
- 239000011229 interlayer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000009747 swallowing Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- 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)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for discharging brine in accumulated residues at the bottom of a salt cavity of an old well cavity and a communicating section, which comprises the following steps: (1) respectively modifying the shafts of a water injection well and a brine production well of the well so that the shafts of the water injection well and the brine production well are used as gas injection wells in the gas injection stage of the gas storage and are used as gas production wells in the gas production stage; (2) drilling a brine discharge well between the pair of wells to enable the brine discharge well to be drilled into insoluble residues in a horizontal communication channel between the pair of wells; drilling a hole in the insoluble residue section, and then performing well cementation construction; (3) and (3) putting the injection and production pipe column and the brine discharge pipe column into the gas injection well and the brine discharge well according to design requirements, injecting natural gas into the gas injection well, and discharging brine from the brine discharge well. The invention provides a method for efficiently utilizing an old well cavity by adopting a drilling water-soluble method to extract salt, and mainly solves the problem that brine in residues accumulated at the bottom of the salt cavity and a horizontal communication section is difficult to discharge.
Description
Technical Field
The invention relates to a method for discharging brine in accumulated residue at the bottom of a salt cavity and a communication section of an old well cavity, belongs to the technical field of natural gas storage, and further belongs to the technical field of effective utilization of space of the accumulated residue at the bottom of a salt cavern gas storage.
Background
The drilling water-soluble method is the dominant salt mining method for the rock salt deposit in China at the present stage. The main type of salt production caverns formed in the near and future are the cavities formed for the wells. The cavity formed by the well is complex in shape, and the salt cavity is generally U-shaped. Most of salt rock mineral deposits in China are layered salt rocks, the salt rock mineral deposits contain a large number of interlayer insoluble substances, the salt rock mineral deposits are low in grade, and a large number of insoluble substance residues are usually accumulated at the bottom of a cavity after salt is mined by water dissolution. For a salt mining layer with high content of insoluble substances, the expansibility of the insoluble substance residues is considered (for example, the expansion coefficient of the insoluble substances in the gold altar salt mine in China reaches 1.6), and after the dissolution cavity is finished, the residue at the bottom of the cavity occupies more than 60% of the space of the salt cavity.
Salt rock is considered a good medium for energy storage. With the rapid increase of global natural gas consumption, the salt cavern storage is the best facility for guaranteeing peak regulation and energy strategic storage, and becomes the first choice for the construction of the current and future underground energy storages of various countries in the world. At present, most of the old cavities of the well with a large amount of insoluble residues accumulated at the bottom are sealed and abandoned due to undersize of effective storage space caused by a large amount of residual brine, so that the effective utilization is not realized, and the waste of salt cavity resources is caused.
The Chinese patent application CN107035343A discloses a method for constructing a salt karst cavity based on a twin-well mining type old well and an application thereof, wherein a drilling well is drilled between the two old wells, fresh water is introduced into the drilling well, and brine discharged from the old wells at two sides is used for dissolving salt rocks in a horizontal section, so that the cavity expansion and capacity increase are carried out on the horizontal section of the old well cavity. However, in the horizontal section cavity dissolving process of the method, the salt layer insoluble substances continue to accumulate towards the bottom of the cavity, and along with accumulation of insoluble substance residues, in order to avoid burying and blocking of the water injection pipe column, the water injection pipe column needs to be lifted above an insoluble substance residue interface. For salt layers with high content of insoluble substances, the method cannot effectively solve the problem of discharging a large amount of residual brine in the residues.
In conclusion, the cavity left by the well salt extraction method is sealed and abandoned due to the fact that a large amount of insoluble residues occupy the cavity space, and the effective storage space is too small, so that the cavity cannot be fully utilized. Related patents also provide a method for constructing a salt rock cavern of an old well exploited by a well, a new well is drilled between wells, and the old well is expanded in level by injecting fresh water through the new well and is expanded in level section of the old well, and the old wells on two sides are used for brine discharge to increase the volume of the old well, but the method for injecting water and discharging brine is still the traditional method, and even if the effective gas storage volume of the cavern is increased, the problem that a large amount of brine in bottom residues cannot be discharged cannot be solved.
Therefore, it has become an urgent technical problem in the art to provide a novel method for discharging brine from accumulated residues at the bottom and the communication section of the salt cavity of the old well.
Disclosure of Invention
In order to solve the defects and shortcomings, the invention aims to provide a method for discharging brine in accumulated residues at the bottom of a salt cavity and a communication section of an old well cavity. The method relates to a method for efficiently utilizing an old well cavity by adopting a drilling water-soluble method to extract salt, and mainly solves the problem that brine in residues accumulated at the bottom of the salt cavity and a horizontal communication section is difficult to discharge.
In order to achieve the above object, the present invention provides a method for discharging brine from residues accumulated at the bottom of a salt cavity of an old well and a communication section, wherein the method for discharging brine from residues accumulated at the bottom of the salt cavity of the old well and the communication section comprises:
(1) respectively modifying the well shafts of a water injection well and a brine production well of the well so as to enable the well shafts to serve as gas injection wells in the gas injection stage of the gas storage and serve as gas production wells in the gas production stage;
(2) drilling a brine discharge well between the pair of wells to enable the brine discharge well to be drilled into insoluble residues in a horizontal communication channel between the pair of wells; drilling a hole in the insoluble residue section, and then performing well cementation construction;
(3) and (3) putting the injection-production pipe column and the brine discharge pipe column into the gas injection well and the brine discharge well according to design requirements, injecting natural gas into the gas injection well, and discharging brine from the brine discharge well.
According to the embodiment of the invention, preferably, the method for discharging brine from the accumulated residues at the bottom of the salt cavity of the old well cavity and the communicating section further comprises the operation of evaluating the availability of the cavity before the step (1).
According to an embodiment of the invention, in the method for discharging brine from the residues accumulated at the bottom of the salt cavity of the old well and the connected section, preferably, the evaluation of the availability of the cavity specifically comprises the following steps:
and evaluating the thickness and the geometric form of the top and bottom plates of the old cavity body to select the cavity body the form of which meets the requirement of the sealing property on the thickness of the top and bottom plates and the geometric stable form.
According to an embodiment of the present invention, in the method for discharging brine from residue accumulated at the bottom of the salt cavity of the old cavity of the twin-well and the communication section, preferably, the modifying the well bores of the water injection well and the brine production well of the twin-well respectively specifically comprises the following steps:
and taking out the casings of the water injection well and the brine extraction well of the old cavity of the well by adopting a full-well casing milling method, reaming by using a reaming bit, then lowering a new large-size casing again, and installing a well mouth and cementing the well.
The existing salt production old cavity suffers from the problems of serious deformation and corrosion of a sleeve, poor well cementation quality, poor sealing condition, small well shaft injection and production swallowing capacity and the like after being subjected to long-time brine production dissolution, and the condition of directly converting the salt production old cavity into an injection and production gas well is not provided, so that a water injection well and a brine production well shaft of a well need to be respectively modified in the method for discharging brine in accumulated residues at the bottom and a communicating section of the salt cavity of the well old cavity.
According to the embodiment of the invention, in the method for discharging brine from the residues accumulated at the bottom of the salt cavity of the old cavity of the well and the communication section, preferably, in the step (2), the brine discharge well is drilled into the insoluble residues in the horizontal communication channel between the pair of wells, so that the bottom end of the brine discharge well is positioned between 2/3 (counted from the top of the horizontal communication channel) of the total height of the horizontal communication channel and the bottom of the horizontal channel.
According to the embodiment of the invention, in the method for discharging brine from the residues accumulated at the bottom of the salt cavity of the old well cavity and the communicating section, the scoring is preferably performed 3-5 times.
According to the embodiment of the invention, in the method for discharging brine from the residues accumulated at the bottom of the salt cavity of the old well cavity and the communication section, preferably, in the step (2), the production casing of the brine discharge well is lowered into the position 15-20m above the top of the horizontal communication channel.
According to the embodiment of the invention, in the method for discharging brine from the accumulated residues at the bottom and the communication section of the salt cavity of the old well, preferably, in the step (3), the brine discharge pipe column is lowered into the horizontal communication channel, so that the bottom end of the brine discharge pipe column is positioned between 1m in the horizontal communication channel and 1/2 (counted from the top of the horizontal communication channel) of the total height of the horizontal communication channel.
According to the specific embodiment of the invention, in the method for discharging the brine in the accumulated residues at the bottom of the salt cavity of the old cavity of the opposite well and the communication section, in the step (3), natural gas is injected into the gas injection well, so that the pressure of the salt cavity is gradually increased, the brine in the salt cavity is gradually discharged through the newly drilled brine discharge well, and finally the brine above the brine discharge port of the brine discharge pipe is effectively discharged.
According to the embodiment of the invention, in the method for discharging the brine from the accumulated residues at the bottom of the salt cavity of the old well cavity and the communication section, preferably, in the step (3), when the brine cannot be discharged, the wellhead of the brine discharge well is closed, and the gas injection and production operation is performed.
According to the specific embodiment of the invention, in the method for discharging brine from the accumulated residues at the bottom of the salt cavity of the old cavity of the well and the communication section, preferably, in the step (3), after the brine discharge is finished, the brine discharge pipe column is taken out, and the gas injection into the gas injection well is continued until the gas storage pressure is reached, so that the normal gas injection and production operation can be performed.
The method for discharging the brine in the residues accumulated at the bottom and the communicating section of the salt cavity of the old well cavity can discharge the brine in the residues accumulated in the cavity and enlarge the effective volume of the salt cavity, and is an efficient method for utilizing the old well cavity by salt mining. By implementing the method, the method has important significance for solving the potential safety hazard problem caused by long-term burying of a large number of old cavities left by well salt extraction in China, relieving the situation of peak regulation shortage of natural gas supply in large and medium cities in China and accelerating the construction of underground energy storage reservoirs in China.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be 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 that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a method for discharging brine from residues accumulated at the bottom and the communicating section of the salt cavities of the old well cavity pair according to an embodiment of the present invention.
The main reference numbers in the figures illustrate:
1-gas injection well (primary water injection well, brine extraction well);
2-discharging the brine well;
3-sonar cavity shape (cavity not filled with residue);
4-cavities occupied by debris;
5-horizontal communication channel.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
The invention will be further described with reference to the accompanying figure 1:
as shown in fig. 1, the present embodiment provides a method for discharging brine from residue accumulated at the bottom of a salt cavity and a horizontal communication section of an old well cavity, wherein the method includes the following specific steps:
evaluating the thickness and the geometric shape of the top and bottom plates of the old cavity (including the cavity 3 which is not filled with the residues and the cavity 4 which is occupied by the residues) to select the cavity the shape of which meets the requirement of the sealing property and the geometric stable shape of which meets the requirement of the thickness of the top and bottom plates;
the well shafts of the original water injection well and the brine extraction well are reformed, in particular to a method of milling the whole well, which takes out all the production casings of the original water injection well and the brine extraction well, and after reaming by a reaming bit, a new large-size production casing is put in again.
The whole well casing milling method is a conventional technical method in the petroleum industry and follows the construction procedures of well dredging, well logging, bridge plugging, casing milling of surface casing and well cementing, casing milling of production casing, well cementing without a well bottom and well cavity communication. The improved shaft conditions need to meet the requirements of gas injection and production and brine discharge, the operation stage of the salt cavern gas storage is carried out after gas injection and brine discharge are finished, the original water injection well and the brine production well are used as a gas injection well 1 in the gas injection stage of the gas storage, and the original water injection well and the brine production well are used as a gas production well in the gas production stage.
Newly drilling a brine discharge well 2, drilling a brine discharge well between the pair of wells, and drilling the brine discharge well into insoluble residues in the horizontal communication channel 5 between the pair of wells, so that the bottom end of the brine discharge well is positioned between 2/3 (counted from the top of the horizontal communication channel) of the total height of the horizontal communication channel and the bottom of the horizontal channel; in an embodiment of the invention, the bottom end of the row of brine wells may be located at 2/3, the total height of the horizontal communication channel; and making a cut 3-5 times into the formed abandoned hole to ensure that the abandoned hole is not buried again by the abandoned hole.
Then, well cementation construction is carried out, and the method specifically comprises the following steps:
the production casing is put into the horizontal communication channel with the top part 15-20m above, the cement is required to return to the ground for well cementation, and the well bore is filled with saturated saline after well completion. And then, carrying out gas sealing test on the whole well section, wherein the gas sealing test is qualified, and the halogen discharge requirement can be met.
Further, the injection-production pipe column and the brine discharge pipe column are respectively put into the gas injection well 1 and the brine discharge well 2 according to the design requirement, so that the bottom end of the brine discharge pipe column is positioned between 1m in the horizontal communicating channel and 1/2 (counted from the top of the horizontal communicating channel) of the total height of the horizontal communicating channel, and in the specific embodiment of the invention, the bottom end of the brine discharge pipe column can be positioned at 1/2 of the total height of the horizontal communicating channel; the brine above the brine discharge opening of the brine discharge pipe column can be effectively discharged; installing a wellhead and a ground brine discharge pipeline and a gas injection pipeline, opening an injection and production valve, and continuously injecting high-pressure natural gas pressurized by a compressor into the cavity through the gas injection well 1. Because the pores in the residue are communicated with each other, under the action of gas pressure, brine in the residue, which is lower than the depth of the underground pipe orifice of the brine discharge well 2, continuously flows to the brine discharge pipe orifice under the action of pressure and is discharged to the ground through a brine discharge pipeline, so that the effective gas storage space of an old cavity is greatly improved.
And after the brine discharge is finished, the brine discharge pipe column is lifted out by a non-well killing operation method. At the moment, the bottom hole pressure does not reach the highest gas storage pressure of the gas storage, and gas is injected to the gas storage pressure continuously through the gas injection and production valve, so that normal gas injection and production can be carried out.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (6)
1. The utility model provides a method for discharging brine in residue is piled up to old chamber salt chamber bottom of well and intercommunication section which characterized in that, the method for discharging brine in residue is piled up to old chamber salt chamber bottom of well and intercommunication section includes:
(1) respectively modifying the well shafts of a water injection well and a brine production well of the well so as to enable the well shafts to serve as gas injection wells in the gas injection stage of the gas storage and serve as gas production wells in the gas production stage;
(2) drilling a brine discharge well between the pair of wells to enable the brine discharge well to be drilled into insoluble residues in a horizontal communication channel between the pair of wells; drilling a hole in the insoluble residue section, and then performing well cementation construction;
in the step (2), a production casing of the brine discharge well is lowered into the position 15-20m above the top of the horizontal communication channel;
(3) the injection-production pipe column and the brine discharge pipe column are put into a gas injection well and a brine discharge well according to the design requirements, natural gas is injected into the gas injection well, and brine is discharged from the brine discharge well;
in the step (3), the halogen discharging pipe column is lowered into the horizontal communicating channel, so that the bottom end of the halogen discharging pipe column is positioned between 1m in the horizontal communicating channel and 1/2 in the total height of the horizontal communicating channel;
the method further comprises the operation of evaluating the availability of the lysis buffer before the step (1), wherein the evaluation of the availability of the lysis buffer specifically comprises the following steps:
and evaluating the thickness and the geometric form of the top and bottom plates of the old cavity body to select the cavity body the form of which meets the requirement of the sealing property on the thickness of the top and bottom plates and the geometric stable form.
2. The method for discharging brine in the accumulated residues at the bottom of the salt cavity of the old well cavity and the communication section according to claim 1, wherein the step of respectively modifying the well shafts of the water injection well and the brine production well of the opposite well specifically comprises the following steps:
taking out the casing pipes of the water injection well and the brine production well of the old cavity of the well by adopting a whole-well casing milling method, reaming by using a reaming bit, then lowering a new large-size casing pipe again, and installing a well mouth and cementing the well.
3. The method for discharging brine in the accumulated residues at the bottom of the salt cavity and the communication section of the well old cavity in the claim 1, wherein in the step (2), the brine discharge well is drilled into the insoluble residues in the horizontal communication channel between the wells, so that the bottom end of the brine discharge well is positioned between 2/3 the total height of the horizontal communication channel and the bottom of the horizontal channel.
4. The method for discharging brine in the accumulated residues at the bottom of the salt cavity and the communication section of the old well cavity according to claim 1, wherein the reaming is performed 3-5 times.
5. The method for discharging the brine in the accumulated residues at the bottom of the salt cavity of the old cavity of the well and the communication section according to claim 1, wherein in the step (3), when the brine cannot be discharged, the wellhead of the brine discharge well is closed, and the gas injection and production operation is performed.
6. The method for discharging the brine in the accumulated residues at the bottom of the salt cavity of the old cavity of the well and the communication section according to any one of claims 1 to 5, wherein in the step (3), after the brine discharge is finished, the brine discharge pipe column is lifted, and the gas injection well is continuously filled with the gas to the gas storage pressure, so that the normal gas injection and production operation can be performed.
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| CN112647907B (en) * | 2020-12-22 | 2022-09-16 | 五矿盐湖有限公司 | Mining method for brine mine with low porosity, low water supply degree and low permeability |
| CN113588306B (en) * | 2021-07-15 | 2022-07-19 | 江苏科技大学 | Experimental device and experimental method for gas storage of residues in bottom pit of old cavity for salt mining |
| CN115893450A (en) * | 2022-01-07 | 2023-04-04 | 江苏国能石油天然气有限公司 | Method for peak regulation and brine collection by utilizing gas equation principle |
| CN114856524B (en) * | 2022-05-24 | 2023-05-09 | 中国科学院武汉岩土力学研究所 | Method for increasing yield and capacity of salt mine drilling water-soluble exploitation |
| CN115095388B (en) * | 2022-06-23 | 2023-09-29 | 江苏苏盐井神股份有限公司 | Gas injection and brine discharge method for communicating well salt cavern compressed gas energy storage |
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| RU2038469C1 (en) * | 1992-05-25 | 1995-06-27 | Научно-технический центр по подземному хранению газонефтепродуктов и захоронению промышленных отходов | Method of joining wells in soluble rock beds |
| CA2725013C (en) * | 2010-01-20 | 2012-12-11 | Harvey Haugen | Solution mining and a crystallizer for use therein |
| BR102012013521B1 (en) * | 2012-06-05 | 2020-09-15 | Mosaic Fertilizantes P&K Ltda | METHOD OF EXPLORING POTASSIUM SALTS FROM AN UNDERGROUND DEPOSIT |
| CN107035343A (en) * | 2017-03-17 | 2017-08-11 | 重庆大学 | A kind of rock salt cavern method of construction and its application based on to the well exploitation old well of formula |
| CN107701189B (en) * | 2017-10-31 | 2019-12-10 | 中国科学院武汉岩土力学研究所 | Double-well construction method for large-scale gas storage of high-impurity salt mine |
| CN107905844B (en) * | 2017-10-31 | 2019-06-25 | 中国科学院武汉岩土力学研究所 | Halogen method is arranged in salt mine old chamber Quan Caidong space gas injection |
| CN108798783A (en) * | 2018-06-15 | 2018-11-13 | 中盐金坛盐化有限责任公司 | The new well boring method of gas storage is transformed in the old chamber in salt cave |
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