CN115247574A - Artificial salt cavern gas storage and construction method thereof - Google Patents
Artificial salt cavern gas storage and construction method thereof Download PDFInfo
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- CN115247574A CN115247574A CN202110459747.3A CN202110459747A CN115247574A CN 115247574 A CN115247574 A CN 115247574A CN 202110459747 A CN202110459747 A CN 202110459747A CN 115247574 A CN115247574 A CN 115247574A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 246
- 238000010276 construction Methods 0.000 title abstract description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 195
- 239000012267 brine Substances 0.000 claims abstract description 191
- 239000013049 sediment Substances 0.000 claims abstract description 80
- 238000007599 discharging Methods 0.000 claims abstract description 32
- 241001131796 Botaurus stellaris Species 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 239000011148 porous material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 39
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 239000011800 void material Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims 1
- 239000004973 liquid crystal related substance Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 83
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 32
- 239000003345 natural gas Substances 0.000 description 16
- 239000010410 layer Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013505 freshwater 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
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000007787 solid 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
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- Geochemistry & Mineralogy (AREA)
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- Environmental & Geological Engineering (AREA)
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- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The application provides an artificial salt cavern gas storage and a construction method thereof, the artificial salt cavern gas storage comprises a plurality of salt cavities and a new drilling well connected with the salt cavities, wherein the new drilling well comprises a horizontal well or a multi-branch well, the new drilling well is provided with a bittern discharging pipe column, and the bittern discharging pipe column of the new drilling well is connected with the salt cavity sediment bottom of the salt cavities. This application discharges bittern through setting up a plurality of salt chamber bottom sediments of new well drilling intercommunication, can be used for the gas storage with the brine discharge in the sediment pore space, improves salt cavern gas storage utilization ratio, and all can carry out the operation to multiple the same or different grade type salt chamber, has reduced row's bittern well quantity, has improved the price/performance ratio of arranging bittern.
Description
Technical Field
The application relates to the field of salt cavern gas storage, in particular to an artificial salt cavern gas storage and a construction method thereof.
Background
The salt cavern gas storage adopts a water-soluble mining mode to construct a cavity, fresh water is injected into an underground salt layer from the ground, solid sodium chloride minerals are dissolved to form brine containing sodium ions and chloride ions, the brine is mined to the ground, and finally a salt cavity is formed in the underground salt layer. The salt layer is not pure, and contains water-insoluble minerals such as argillaceous substances and gypsum, and the minerals are released from the salt layer, absorb water and expand, and are loosely stacked at the bottom of the salt cavity to form sediments. The space cannot be utilized, and the utilization rate and the economical efficiency of the salt cavern gas storage are seriously reduced. For example, the average insoluble content of the gas storage in the gold jar is 17%, the volume of the sediments after expansion is about 30% of the total cavity, and the volume of the sediments pores is about 15%. The content of other insoluble substances in the gas storage is higher, and the thickness of the interlayer of the insoluble substances in the flat-topped mountain gas storage accounts for 30-40%.
If the pore space of the sediment is fully utilized for gas storage, the economy of the salt cavern gas storage can be obviously improved. At present, in the traditional gas injection and brine discharge method, a brine discharge pipe column is lowered from the upper part of a salt cavity, the brine discharge pipe column cannot be lowered into sediments, and brine in sediment pores cannot be discharged. In the existing sediment pore space utilization method, a mode that 1 salt cavity is matched with 1 new brine discharge well is mostly adopted, the brine discharge well adopts a vertical well to directly drive into the bottom of the salt cavity from the top of the salt cavity or into the side surface of the salt cavity, a new cavity is firstly manufactured and then is communicated with the bottom of the salt cavity. In the mode, each salt cavity needs to be provided with 1 new well, the cost is high, the economy is poor, and particularly for small salt cavities.
In conclusion, by adopting the traditional gas injection and brine discharge method, brine in the sediment space cannot be discharged, and cannot be effectively utilized. In the existing new gas injection and brine discharge method utilizing the sediment space, 1 well needs to be allocated in a cavity 1, so that the cost is high, the economical efficiency is poor, and the adaptability is low.
Disclosure of Invention
In order to solve the technical problem, the application provides an artifical salt cavern gas storage, include a plurality of salt chambeies and the new well drilling that links to each other with a plurality of salt chambeies, wherein the new well drilling is provided with row's bittern pipe post, just the row's bittern pipe post of new well drilling links to each other with salt chamber sediment bottom in a plurality of salt chambeies.
According to one embodiment of the invention, the new well comprises a horizontal well or a multilateral well.
According to one embodiment of the invention, the plurality of horizontal or multilateral wells, to which the salt cavities are connected, comprise a sequential or distributed connection.
According to one embodiment of the invention, sieve holes are arranged at the connection part of the brine discharge pipe column and the bottom of the salt cavity sediment of the salt cavities.
According to one embodiment of the invention, a packer is arranged between the brine discharge pipe columns connected with the sediment bottom of the salt cavities.
According to one embodiment of the invention, the packer comprises a temporary sealing mode and can be unsealed according to the requirement.
According to one embodiment of the invention, the number of the salt cavities is more than or equal to 4, the total volume of the single-cavity space of the salt cavities comprises 10-100 ten thousand square, the free space comprises 10 ten thousand square, the sediment volume comprises 15 ten thousand square, the sediment void space comprises 6.6 ten thousand square, the cavity top depth is 995 meters, the sediment surface depth is 1115 meters, and the bottom lowest point of the sediment of the salt cavity is 16 meters and 1170 meters.
According to one embodiment of the invention, the salt cavities are of the same or different type; according to another embodiment of the invention the salt chambers are located on the same line or not.
According to one embodiment of the invention, the new wellbore is cemented using a running in technique casing.
According to another embodiment of the invention, the technical casing diameter size comprises 20 inches, 9/8 inches, and the technical casing is lowered into the salt formation more than 15 meters from the top boundary of the salt formation.
According to one embodiment of the invention, the salt chamber top further comprises an old well comprising a brine discharge string; preferably, the diameter of the brine discharge pipe column of the old well comprises 4.5 inches or 7 inches, and the depth of the brine discharge pipe column is 1-2 meters higher than the sediment surface of the salt cavity.
Another aspect of the present invention is to provide a method for constructing the artificial salt cavern gas storage, which comprises the following steps:
s1, arranging a new drilling well connected with a plurality of salt cavities, wherein the new drilling well is provided with a brine discharge pipe column, and the brine discharge pipe column is connected with the bottoms of salt cavity sediments of the salt cavities;
s2, arranging a brine discharge pipe column on each salt cavity to the top of the residue to inject gas and discharge brine until the free space at the upper part of the salt cavity is filled with stored gas, and taking out the brine discharge pipe columns;
and S3, discharging brine from the bottom of the sediment by using a new well, injecting gas into the old well at the same time until the pore space of the sediment is emptied, and filling the brine with stored gas to form an artificial salt cavern gas storage.
According to one embodiment of the invention, the new wellbore in the method comprises a horizontal well or a multilateral well.
According to one embodiment of the invention, the salt cavities are positioned on the same straight line in the method, and horizontal wells are selected to be sequentially connected with the salt cavities; and/or the salt cavities are not positioned on the same straight line, and multiple branch wells are selected to be respectively and independently connected with the salt cavities.
According to one embodiment of the invention, the salt cavities in the method are positioned on the same straight line, and when the salt cavities are the same in type, a plurality of salt cavities of a horizontal well are selected to inject gas and discharge brine at the same time.
According to one embodiment of the invention, the method for simultaneously injecting gas and discharging brine by using a plurality of salt cavities of the horizontal well further comprises the following steps:
and (3) putting a brine discharging pipe column in the horizontal well, injecting and storing gas through a plurality of old salt cavity wells simultaneously, and discharging brine in the free space and brine in the sediment pore space to the ground through the brine discharging pipe column of the horizontal well from top to bottom by gas displacement.
According to one embodiment of the invention, in the method, the salt cavities are positioned on the same straight line, and when the salt cavity types are different, single salt cavities of a horizontal well are selected to inject gas and discharge brine one by one; according to another embodiment of the invention, the method for selecting the single salt cavities of the horizontal well to inject gas and discharge brine one by one further comprises the following steps: a packer is arranged on the brine discharge pipe column between the first salt cavity and the second salt cavity, and an annulus between the brine discharge pipe column and an open hole is sealed; injecting storage gas from an old well at the top of the first salt cavity, and discharging brine from a brine discharge pipe column in the horizontal well until the brine in the salt cavity sediment is discharged; the brine discharge pipe column is lifted, a cementing well plug is arranged on the open hole well section communicated with the first salt cavity, and the cement surface is arranged between the first salt cavity and the second salt cavity; and analogizing in turn, and performing gas injection and brine discharge on the second salt cavity and the subsequent salt cavities.
According to one embodiment of the invention, the salt cavities in the method are positioned on different straight lines, and when the salt cavities are the same in type, a plurality of salt cavities of a multilateral well are simultaneously injected with gas and brine;
according to another embodiment of the invention, when the method adopts a plurality of salt cavities of a multilateral well to inject gas and discharge brine simultaneously, the method comprises the following steps: and (3) descending a brine discharge pipe column in each branch well, injecting and storing gas through a plurality of salt cavity old wells simultaneously, and discharging brine in the brine and sediment pore space in the free space to the ground through the brine discharge pipe columns of the multi-branch wells from top to bottom by using the gas.
According to another embodiment of the invention, the salt cavities in the method are positioned on different straight lines, and when the salt cavities are different in type, the gas injection and the brine discharge are carried out one by adopting a single salt cavity of a multilateral well.
According to another embodiment of the invention, the method for performing gas injection and brine discharge one by using the single salt cavities of the multilateral well comprises the following steps: a bittern discharge pipe column is arranged in a branch well of a salt cavity to be injected with gas and discharged with bittern, and a packer is arranged outside the bittern discharge pipe column; injecting storage gas from an old well at the top of the salt cavity, and discharging brine from the brine discharge pipe column until the brine in the sediment gap is emptied; injecting cement into the branch well to fix the well and block the branch channel; and analogizing in turn, and performing gas injection and brine discharge on the second salt cavity and the subsequent salt cavities.
Compared with the prior art, the method has the following technical effects:
1. brine in the pore space of the sediments can be discharged for storage, the utilization rate of the salt cavern gas storage is improved, and particularly, the brine in the pore space of the salt cavern can be fully discharged for the gas storage with high content of insoluble substances;
2. the operation can be carried out on a plurality of salt cavities of the same type or different types, for example, the gas injection and the brine discharge can be carried out on the salt cavities of the same type at the same time, the gas injection and the brine discharge can be carried out on the salt cavities of different types one by one, and the operation on the salt cavities in production and the salt cavities in non-production is more flexible;
3. the gas injection and brine discharge of a plurality of salt cavities can be completed by arranging a new drilling well, so that the number of brine discharge wells is reduced, the cost is reduced, and the cost performance is high.
Drawings
FIG. 1 is a flow chart of a method for discharging brine from bottom sediments by using a horizontal well or a multilateral well to communicate with a multi-salt cavity, which is provided by an embodiment of the invention;
fig. 2 is a schematic view of an initial state in which a plurality of salt cavities of a horizontal well simultaneously inject gas and discharge brine, and step S1 is performed according to an embodiment of the present invention;
fig. 3 is a schematic view of a state where the step S2 is performed by simultaneously injecting gas and discharging brine in a plurality of salt cavities of the horizontal well according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a final state of the step S3 performed by simultaneously injecting gas and discharging brine in a plurality of salt cavities of the horizontal well according to an embodiment of the present invention;
fig. 5 is a schematic view of an initial state in which step S1 is performed by performing gas injection and brine discharge one by one in a single salt cavity of a horizontal well according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a state where gas injection and brine discharge are performed on the first salt cavities one by one in the horizontal well according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a state where gas injection and brine discharge are performed on single salt cavities of a horizontal well one by one to complete gas injection and brine discharge of a second salt cavity in step S3 according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a state where gas injection and brine discharge are performed on a single salt cavity of a horizontal well one by one to complete the gas injection and brine discharge of a third salt cavity in step S3 according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a final state in which gas injection and brine discharge are performed on four salt cavities one by one in a horizontal well, and in step S3, according to an embodiment of the present invention;
fig. 10 is a schematic view of an initial state of step S1 performed by simultaneously injecting gas and discharging brine by using multiple salt cavities of a multilateral well according to an embodiment of the present invention;
FIG. 11 is a top view of a gas injection and brine discharge using multilateral wells according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of the final state of step S3 performed by injecting gas and discharging brine from a plurality of salt cavities of a multilateral well according to an embodiment of the present invention;
fig. 13 is a schematic diagram of an initial state of step S1 performed by injecting gas and removing brine one by one in a single salt cavity of a multilateral well according to an embodiment of the present invention.
Fig. 14 is a schematic view of a final state of step S3 performed by performing gas injection and brine discharge one by one in a single salt cavity of a multilateral well according to an embodiment of the present invention.
Reference numerals: 1-old well 1,2-old well 2,3-old well 3,4-old well 4,5-newly drilled horizontal well, 6-overlying mudstone cover, 7-salt layer, 8-underlying mudstone bottom plate, 9-old well technical casing, 10-old well bittern discharging pipe column, 11-bittern in free space of salt cavity, 12-bittern in space of sediment, 13-salt cavity, 14-new well technical casing, 15-new well bittern discharging pipe column, 16-lowest point of sediment, 17-sieve hole, 18-stored gas in free space of salt cavity, 19-stored gas in space of sediment, 20-packer, 21-cement plug, 22-newly drilled multilateral well.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1, according to an embodiment of the present invention, there is provided a method for constructing an artificial salt cavern gas storage, comprising the steps of:
s1, arranging a new drilling well connected with a plurality of salt cavities, wherein the new drilling well is provided with a brine discharge pipe column, and the brine discharge pipe column is connected with the bottoms of salt cavity sediments of the salt cavities;
s2, arranging a bittern discharge pipe column to the top of the residue for gas injection and bittern discharge in each salt cavity until the free space at the upper part of the salt cavity is filled with stored gas, and taking out the bittern discharge pipe columns;
and S3, discharging brine from the bottom of the sediment by using a new well, injecting gas into the old well at the same time until the pore space of the sediment is emptied, and filling the brine with stored gas to form an artificial salt cavern gas storage.
The technical solution of the present invention is further illustrated by the following specific examples:
example 1
In the embodiment, a mode of simultaneously injecting gas and discharging brine in a plurality of salt cavities of a horizontal well is adopted, as shown in fig. 2.
Referring to fig. 2, 4 old wells 1,2, 3 and 4 which are not put into production in a salt mine area are provided, saturated brine is filled in the salt cavities, and the positions of the salt cavities are basically on the same straight line.
The total space volume of a single cavity is about 25 ten thousand square, the free space brine is about 10 ten thousand square, the volume of insoluble sediment is about 15 ten thousand square, the sediment void space brine is about 6.6 ten thousand square, the cavity top depth is 995 meters, the sediment surface depth is 1115 meters, and the lowest point of the sediment bottom of the salt cavity is 16 meters and 1170 meters.
And (3) executing the step S1, and referring to the description of fig. 2, wherein a newly drilled horizontal well 5 is used as a brine discharge well, the horizontal well sequentially drills through salt cavities corresponding to an old well 4, an old well 3, an old well 2 and an old well 1, and a communicated target point is the lowest point 16 at the bottom of the sediment of the salt cavity. The technical casing 14 is lowered into the well with a diameter of 9/8 inch and a lowering depth of 980 m, and the top limit 965 m of the salt layer 7 is 15 m apart. A brine discharge pipe column 15 is arranged in the well, the diameter of the brine discharge pipe column is 4/2 inch, and sieve holes 17 are arranged at the positions where the brine discharge pipe column is communicated with the salt cavities.
And S2, referring to fig. 3, the brine discharging pipe column 10 is put into the salt cavity old well 1, the old well 2, the old well 3 and the old well 4 which are not put into production, natural gas is injected from the annular space between the technical casing 9 and the brine discharging pipe column 10, brine is extracted from the brine discharging pipe column 10, and gas is injected to discharge brine at the same time until the free space at the upper part of the salt cavity is filled with natural gas 18. After step S2 is performed, the salt cavity state is as shown in fig. 3.
After the gas injection and brine discharge in the free space are finished, the brine discharge pipe column 10 is taken out by adopting snubbing operation.
And S3, referring to fig. 4, natural gas is injected from the technical casing 9 of the 4 old wells at the same time, and brine 12 in the sediment void space is displaced from top to bottom and is discharged to the ground from the brine discharge pipe column 15 in the horizontal well 5 until the sediment space is filled with natural gas 19, so that a gas storage reservoir is formed. After step S3 is performed, the salt cavity state is as shown in fig. 4.
Example 2
In the embodiment, a mode of injecting gas and discharging halogen is adopted for single cavities of a horizontal well one by one, as shown in fig. 5.
Referring to fig. 5, 4 old wells 1,2, 3 and 4 which are not put into production in a salt mine area are provided, saturated brine is filled in the salt cavities, and the positions of the salt cavities are basically on the same straight line.
The total space volume of a single cavity is about 25 ten thousand square, the free space brine is about 10 ten thousand square, the volume of insoluble sediment is about 15 ten thousand square, the sediment void space brine is about 6.6 ten thousand square, the cavity top depth is 995 meters, the sediment surface depth is 1115 meters, and the lowest point of the sediment bottom of the salt cavity is 16 meters and 1170 meters.
And (3) executing the step S1, and referring to the description of fig. 5, wherein a newly drilled horizontal well 5 is used as a brine discharge well, the horizontal well sequentially drills through salt cavities corresponding to an old well 4, an old well 3, an old well 2 and an old well 1, and a communicated target point is the lowest point 16 at the bottom of the sediment of the salt cavity. The technical casing 14 is lowered into the well with a diameter of 9/8 inch and a lowering depth of 980 m, and the top limit 965 m of the salt layer 7 is 15 m apart. A brine discharge pipe column 15 with the diameter of 4/2 inch is arranged in the well, and only the tail end of the brine discharge pipe column is provided with a sieve hole 17. And a packer is arranged on the brine discharge pipe column between the old well 1 and the old well 2, and an annulus between the brine discharge pipe column and the open hole is sealed and isolated.
And S2, referring to FIG. 5, a brine discharge pipe column 10 is put into the old well 1, the old well 2, the old well 3 and the old well 4 without the salt cavity, natural gas is injected into an annular space between a technical sleeve 9 of the old well 1 and the brine discharge pipe column 10, brine is extracted from the brine discharge pipe column 10, and gas is injected and brine is discharged at the same time until a free space at the upper part of the salt cavity is filled with natural gas 18.
After the free space gas injection and brine discharge are completed, the brine discharge pipe column 10 is taken out by adopting snubbing operation.
And S3, referring to fig. 6, injecting natural gas from the technical casing 9 of the old well 1, and discharging brine from the brine discharge pipe column 15 in the horizontal well 5 until the brine in the sediment space of the salt cavity is emptied and filled with natural gas 19.
And S3, referring to fig. 6, pulling out the brine discharge pipe column 15 in the horizontal well, and cementing to form a cement plug 21 to plug the salt cavity 13 corresponding to the old well 1 so as to prevent brine in the old well from leaking out.
And (5) repeating the steps (4) to (7), and sequentially carrying out gas injection and brine discharge operations on the sediment space of the old well 2, the old well 3 and the old well 4, wherein the processes are shown in the figures 7 to 9. Finally, all the brine in the salt cavity is completely emptied to form a gas storage, and the final state of the salt cavity is shown in figure 9.
Example 3
In this embodiment, a multilateral well multi-salt cavity simultaneous gas injection and brine discharge manner is adopted, as shown in fig. 10 and 11, fig. 11 is a top view of fig. 10.
Referring to fig. 10, 4 old wells 1,2, 3 and 4 which are not put into production are arranged in a salt mine area, saturated brine is filled in the salt cavities, and the positions of the salt cavities are relatively dispersed.
The total space volume of a single cavity is about 25 ten thousand square, the free space brine is about 10 ten thousand square, the volume of insoluble sediment is about 15 ten thousand square, the sediment void space brine is about 6.6 ten thousand square, the cavity top depth is 995 meters, the sediment surface depth is 1115 meters, and the lowest point of the sediment bottom of the salt cavity is 16 meters and 1170 meters. The depth of the slag surface is 1115 meters, and the depth of the lowest point of the bottom of the sediment of the salt cavity is 1170 meters.
Step S1 is executed as explained with reference to fig. 10 and 11. And a newly drilled multilateral well 22 is used as a brine discharge well, four branches of the well sequentially drill through salt cavities corresponding to the old well 1, the old well 2, the old well 3 and the old well 4, and a communicated target point is the lowest point 16 of the bottom of the sediment of the salt cavity. The technical casing 14 is lowered into the well with a diameter of 9/8 inch and a lowering depth of 980 m, and the top limit 965 m of the salt layer 7 is 15 m apart. The 4 branch wells are all provided with brine discharge pipe columns 15 with the diameter of 4/2 inch, the brine discharge pipe columns are communicated with the salt cavities, and sieve holes 17 are arranged at the communicated positions.
And S2, referring to FIG. 10, a brine discharge pipe column 10 is put into the old well 1, the old well 2, the old well 3 and the old well 4 which are not put into production, natural gas is injected from the annular space between the technical casing 9 and the brine discharge pipe column 10, brine is produced from the brine discharge pipe column 10, and gas is injected to discharge brine at the same time until the free space at the upper part of the salt cavity is filled with natural gas 18.
After the gas injection and brine discharge in the free space are finished, the brine discharge pipe column 10 is taken out by adopting snubbing operation.
Step S3 is executed, referring to fig. 12, natural gas is injected from the technical casing 9 of the 4 old wells at the same time, and the sediment void space brine 12 is displaced from top to bottom and is discharged from the brine discharge pipe column 15 in the horizontal well 5 to the ground until the sediment space is filled with natural gas 19, so as to form a gas storage. After step S3, the salt chamber state is as shown in fig. 12.
Example 4
In this embodiment, a multi-branch well single salt cavity is adopted to inject gas and discharge brine one by one, as shown in fig. 13.
Referring to fig. 13, 4 old wells 1,2, 3 and 4 which are not put into production are arranged in a salt mine area, saturated brine is filled in the salt cavities, and the positions of the salt cavities are relatively dispersed.
The sonar cavity measurement is performed in the cavity construction process and after the cavity construction is finished, the total space volume of a single cavity is about 25 ten thousand square, the free space brine is 11 about 10 ten thousand square, the volume of insoluble sediments is about 15 ten thousand square, the sediment void space brine is 12 about 6.6 ten thousand square, the cavity top depth is 995 meters, the sediment surface depth is 1115 meters, and the lowest point of the sediment bottom of the salt cavity is 16 depth 1170 meters. The depth of the slag surface is 1115 meters, and the depth of the lowest point of the bottom of the sediment of the salt cavity is 1170 meters.
Step S1 is executed, as explained with reference to fig. 13. And a newly drilled multilateral well 22 is used as a brine discharge well, four branches of the well sequentially drill through salt cavities corresponding to the old well 1, the old well 2, the old well 3 and the old well 4, and a communicated target point is the lowest point 16 of the bottom of the sediment of the salt cavity. The technical casing 14 is lowered into the well with a diameter of 9/8 inch and a lowering depth of 980 m, and the top limit 965 m of the salt layer 7 is 15 m apart. And (3) only setting a brine discharge pipe column 15 with the diameter of 4/2 inch in the branch well corresponding to the old well 1, wherein the brine discharge pipe column is communicated with the salt cavity, and sieve holes 17 are arranged at the communicated position. Be equipped with the packer on arranging the steamed tubular column in the lateral well of old well 1, seal and separate and arrange the annular space between steamed tubular column and the bore hole, prevent that other salt chamber brine from getting into and arranging the steamed tubular column.
And S2, referring to fig. 13, the old well 1, the old well 2, the old well 3 and the old well 4 which are not put into production are provided with the brine discharge pipe column 10, natural gas is injected from the annular space between the technical casing 9 of the old well 1 and the brine discharge pipe column 10, brine is extracted from the brine discharge pipe column 10, and simultaneously gas is injected for brine discharge until the free space at the upper part of the salt cavity is filled with natural gas 18.
After the gas injection and brine discharge in the free space are finished, the brine discharge pipe column 10 is taken out by adopting snubbing operation.
Step S3 is executed, referring to fig. 14, natural gas is injected from the technical casing 9 of the old well 1, brine is discharged from the brine discharge pipe column 15 in the branch corresponding to the old well 1 of the multilateral well, until brine in the sediment space of the salt cavity is emptied, and the natural gas 19 is filled.
And (S3) a step S14 is executed, the brine discharge pipe column 15 is lifted, and a cement plug 21 is injected into the branch well to plug the salt cavity 13 corresponding to the old well 1 so as to prevent brine in the old well from leaking out.
And (5) repeating the steps (4) to (7), and sequentially carrying out gas injection and brine discharge operations on the sediment space of the old well 2, the old well 3 and the old well 4. Finally, all the brine in the salt cavity is completely emptied to form a gas storage reservoir, and the final state of the salt cavity is shown in fig. 14.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. An artificial salt cavern gas storage comprises a plurality of salt cavities and a new drilling well connected with the salt cavities, wherein the new drilling well is provided with a brine discharge pipe column, and the brine discharge pipe column is connected with the bottom of salt cavity sediments of the salt cavities.
2. The artificial salt cavern gas reservoir of claim 1, wherein the newly drilled well comprises a horizontal well or a multilateral well; and/or
The horizontal wells or the multilateral wells connected with the salt cavities are sequentially connected or connected in a distributed manner.
3. The artificial salt cavern gas storage as claimed in claim 1 or 2, wherein a sieve hole is arranged at the connection part of the brine discharge pipe column and the bottom of the salt cavity sediments of a plurality of salt cavities.
4. The artificial salt cavern gas storage as claimed in claim 1 or 2, wherein a packer is arranged between the brine discharge pipe columns connected with the bottom of the salt cavity sediments of the plurality of salt cavities; and/or the packer comprises a temporary sealing mode and can be unsealed according to the requirement.
5. The artificial salt cavern gas storage as claimed in any one of claims 1 to 4, wherein the number of the salt cavities is 4 or more, and the total volume of the single-cavity space of the salt cavities comprises 10 to 100 ten thousand squares, the free space comprises 10 ten thousand squares, the sediment volume comprises 15 ten thousand squares, the sediment void space comprises 6.6 ten thousand squares, the cavity top depth is 995 m, the sediment surface depth is 1115 m, and the bottom lowest point of the sediment of the salt cavities is 16 m and 1170 m.
6. The artificial salt cavern gas reservoir of claim 5, wherein the salt cavities are of the same or different type and/or are positioned in the same line or in different lines.
7. The artificial salt cavern gas reservoir of any one of claims 1 to 4, wherein the new well is cemented using a run in technology casing; and/or
The diameter of the technical casing can be 20 inches or 9/8 inches, and the technical casing is arranged in the salt layer and is more than 15 meters away from the top boundary of the salt layer.
8. The artificial salt cavern gas storage as claimed in any one of claims 1 to 4, wherein the top of the salt cavity further comprises an old well, the old well comprising a brine discharge pipe string; preferably, the diameter of the brine discharge pipe column of the old well comprises 4.5 inches or 7 inches, and the depth of the brine discharge pipe column is 1-2 meters higher than the sediment surface of the salt cavity.
9. The method for constructing an artificial salt cavern gas storage as claimed in any one of claims 1 to 8, comprising the following steps:
s1, arranging a new drilling well connected with a plurality of salt cavities, wherein the new drilling well is provided with a brine discharge pipe column, and the brine discharge pipe column is connected with the bottoms of salt cavity sediments of the salt cavities;
s2, arranging a brine discharge pipe column on each salt cavity to the top of the residue to inject gas and discharge brine until the free space at the upper part of the salt cavity is filled with stored gas, and taking out the brine discharge pipe columns;
and S3, discharging brine from the bottom of the sediment by using a new well, injecting gas into the old well at the same time until the pore space of the sediment is emptied, and filling the brine with stored gas to form an artificial salt cavern gas storage.
10. The method of constructing an artificial salt cavern gas reservoir as claimed in claim 9, wherein the newly drilled well comprises a horizontal well or a multilateral well.
11. The method for constructing the artificial salt cavern gas storage as claimed in claim 9 or 10, wherein the salt cavities are positioned on the same straight line, and horizontal wells are selected to be sequentially connected with the salt cavities; and/or the salt cavities are not positioned on the same straight line, and multiple branch wells are selected to be respectively and independently connected with the salt cavities.
12. The method for constructing the artificial salt cavern gas storage as claimed in claim 10, wherein the salt cavities are positioned on the same straight line, and when the salt cavity types are the same, a plurality of salt cavities of a horizontal well are selected to inject gas and discharge brine at the same time; preferably, the first and second electrodes are formed of a metal,
the method for simultaneously injecting gas and discharging brine by adopting a plurality of salt cavities of the horizontal well further comprises the following steps: and (3) putting a brine discharging pipe column in the horizontal well, injecting and storing gas through a plurality of old salt cavity wells simultaneously, and discharging brine in the free space and brine in the sediment pore space to the ground through the brine discharging pipe column of the horizontal well from top to bottom by gas displacement.
13. The method for constructing the artificial salt cavern gas storage as claimed in claim 10, wherein the salt cavities are located on the same straight line, and when the salt cavity types are different, the single salt cavities of the horizontal well are selected to inject gas and discharge brine one by one; preferably, the first and second liquid crystal display panels are,
the method for selecting the single salt cavities of the horizontal well to inject gas and discharge brine one by one comprises the following steps: a packer is arranged on the brine discharge pipe column between the first salt cavity and the second salt cavity, and an annulus between the brine discharge pipe column and an open hole is sealed; injecting storage gas from an old well at the top of the first salt cavity, and discharging brine from a brine discharge pipe column in the horizontal well until the brine in the salt cavity sediment is discharged; the method comprises the following steps of (1) taking out a brine discharge pipe column, cementing and plugging an open hole well section communicated with a first salt cavity, wherein a cement surface is arranged between the first salt cavity and a second salt cavity; and analogizing in turn, and performing gas injection and brine discharge on the second salt cavity and the subsequent salt cavities.
14. The method for constructing an artificial salt cavern gas storage as claimed in claim 10, wherein the salt cavities are not located on the same line, and when the salt cavities are the same type, a plurality of multilateral wells are used to inject gas and remove brine simultaneously;
preferably, when the gas injection and the brine discharge are simultaneously performed by adopting a plurality of salt cavities of the multilateral well, the method comprises the following steps: and (3) descending a brine discharge pipe column in each branch well, injecting storage gas through a plurality of old salt cavity wells simultaneously, and discharging brine in the free space and brine in sediment pore spaces to the ground through the brine discharge pipe columns of the branch wells from top to bottom by using the gas.
15. The method for constructing an artificial salt cavern gas storage as claimed in claim 10, wherein the salt cavities are positioned on different lines, and when the salt cavity types are different, the gas injection and the brine discharge are carried out one by adopting a multi-branch well single salt cavity;
preferably, the gas injection and brine discharge of the single salt cavities of the multilateral well one by one comprises the following steps: a bittern discharge pipe column is arranged in a branch well of a salt cavity to be injected with gas and discharged with bittern, and a packer is arranged outside the bittern discharge pipe column; injecting storage gas from an old well at the top of the salt cavity, and discharging brine from the brine discharge pipe column until the brine in the sediment gap is discharged; injecting cement into the branch well to fix the well and block the branch channel; and analogizing in turn, and performing gas injection and brine discharge on the second salt cavity and the subsequent salt cavities.
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