CN115324528A - Operation method for storing gas by utilizing residual void space of salt cavern gas storage - Google Patents
Operation method for storing gas by utilizing residual void space of salt cavern gas storage Download PDFInfo
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- CN115324528A CN115324528A CN202110503937.0A CN202110503937A CN115324528A CN 115324528 A CN115324528 A CN 115324528A CN 202110503937 A CN202110503937 A CN 202110503937A CN 115324528 A CN115324528 A CN 115324528A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 150000003839 salts Chemical class 0.000 title claims abstract description 40
- 239000011800 void material Substances 0.000 title claims abstract description 22
- 239000012267 brine Substances 0.000 claims abstract description 85
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 85
- 239000007789 gas Substances 0.000 claims abstract description 67
- 238000007599 discharging Methods 0.000 claims abstract description 53
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 40
- 150000002367 halogens Chemical class 0.000 claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 239000003345 natural gas Substances 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000013505 freshwater Substances 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 31
- 239000007924 injection Substances 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 10
- 238000009933 burial Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 208000028659 discharge Diseases 0.000 description 39
- 239000010410 layer Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- 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
- E21B43/11—Perforators; Permeators
-
- 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
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
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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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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
An operation method for storing gas by utilizing a residue void space of a salt cavern gas storage comprises the following steps: drilling a cavity-making well and a residue brine-discharging well at intervals in parallel; injecting a fresh water dissolving cavity wall into the cavity building well, building a cavity, and sealing a well mouth of the residue halogen discharging well for sealing and pressure maintaining; opening a well mouth of the residue halogen discharging well, performing perforation operation on the part, submerged in the residue, of the cavity making layer section of the residue halogen discharging well, and closing the well mouth of the residue halogen discharging well again after the perforation operation is completed; keeping the well mouth of the perforation closed, and injecting natural gas into the cavity building well to discharge brine in the cavity of the cavity building well; opening the wellhead of the residue brine discharge well, injecting natural gas into the cavity making well, and discharging brine in the residue from the residue brine discharge well; plugging the wellhead of the residue brine discharge well, and performing natural gas storage and gas production operation through the cavity-making well; therefore, partial gap water in the residues is discharged, and the volume of the effective cavity is increased.
Description
Technical Field
The invention relates to the field of oil and gas development, in particular to an operation method for storing gas by utilizing residue void space of a salt cavern gas storage.
Background
The salt cavern gas storage is a natural gas storage method which injects fresh water into an underground natural salt layer, erodes a cavity with a certain shape and volume, and injects natural gas into the cavity for storage. Different from foreign high-grade ultra-thick salt dome strata, the salt cavern gas storage in China is built in layered salt rocks, and is characterized by high content of insoluble substances and thick interlayer, so that the geological conditions for building the reservoir are complex.
Insoluble substances collapse and expand and are accumulated at the bottom of the salt cavity in the process of cavity construction of the salt cavern gas storage, so that gap residues are formed, the gas production cannot be carried out by injecting the part of the volume, and a great part of the space of the salt cavity is wasted. Insoluble substances in the residue are quickly accumulated, a large amount of void space exists without being compacted, and the void space is filled with brine. The void space in the insoluble residue may account for 20% of the total volume of the salt cavity, calculated as a packing factor of 1.5, with an insoluble content of 40%.
The traditional gas injection and brine discharge process adopted at present can only discharge brine in a cavity space above the top surface of residues, and the void space in the residues cannot be utilized. Even if the halogen discharging pipe column is put into the residue, the problem that the pipe column is blocked and the space in the residue cannot be utilized exists, and the problem that the space in the residue is wasted cannot be solved by the existing cavity forming and gas injection halogen discharging process.
Disclosure of Invention
The invention aims to provide an operation method for storing gas by utilizing a residue void space of a salt cavern gas storage, so as to solve the problem that the residue void space cannot be utilized.
In order to achieve the above object, the operation method for storing gas by utilizing the residual void space of the salt cavern gas storage provided by the invention specifically comprises the following steps: s10, drilling salt cavern gas storage banks at intervals in parallel to obtain a cavity-building well and a residue halogen-discharging well; s20, injecting a fresh water dissolving cavity wall into the cavity building well, building a cavity, and sealing a well mouth of the residue and halogen discharging well to seal and maintain pressure; s30, opening a well mouth of the residue halogen discharging well, performing perforation operation on the part, submerged into the residue, of the cavity-making layer section of the residue halogen discharging well, and closing the well mouth of the residue halogen discharging well again after the perforation operation is completed; s40, keeping a well mouth of a perforation closed, and injecting natural gas into a cavity building well to discharge brine in a cavity of the cavity building well; s50, opening a wellhead of the residue brine discharge well, injecting natural gas into the cavity building well, and discharging brine in the residue from the residue brine discharge well; and S60, plugging the well head of the residue brine discharge well, and performing natural gas storage and gas production operation through the cavity-making well.
Further, in step S10, the cavity creating well and the residue halogen discharging well are both vertical wells, and the horizontal interval between the cavity creating well and the residue halogen discharging well is 15m to 30m.
Further, in step S10, the cementing depth of the cavity-making well is 20m below the top surface burial depth of the salt layer, and the cementing depth of the residue-discharging brine well is the drilling completion depth.
Further, step S20 includes: and (3) putting a central pipe and an intermediate pipe into the cavity-making well, injecting fresh water to dissolve the cavity wall and making a cavity in the cavity-making well, and sealing the well mouth of the residue brine-discharging well to seal and maintain pressure.
Further, in step S20, the middle tube is a 7-inch sleeve, and the center tube is 4 1 / 2 Inch tubing.
Further, step S20 further includes: in the cavity building process, a cushion layer is adopted to control the salt rock to be dissolved too fast; controlling the shape of a cavity of the cavity by adopting a pipe column sectional lifting method; and detecting and monitoring the shape of the cavity by using sonar, and performing sleeve inspection and hermetic seal test after the cavity is built.
Further, step S30 includes: and (3) putting the perforator into the residues for subsection perforation, establishing a circulation channel between residual brine in the residues and a residue brine discharge well, and sealing a well mouth of the residue brine discharge well after perforation is finished.
Further, step S40 includes: a gas injection and production pipe column and a brine discharge pipe column are put in, the putting position of the brine discharge pipe column is close to the top of the residue, and a safety valve is installed at the wellhead of the cavity building well; injecting natural gas into the annular space of the gas injection and production tubular column and the brine discharge tubular column, and discharging brine in the cavity to the ground surface through the brine discharge tubular column by using pressure; and after the brine discharge is finished, the brine discharge pipe column is lifted by using a non-killing operation method. Further, step S60 includes: and closing the well mouth of the residue brine discharge well, and performing natural gas storage and gas production operation through the gas injection and production pipe column.
Further, the gas injection and production pipe column is a 7-inch casing pipe, and the brine discharge pipe column is 4 1 / 2 Inch tubing.
The invention has the advantages that the bottom pit residues are subjected to perforation operation through the residue halogen discharging well, and halogen discharging operation is performed through the residue halogen discharging well, so that part of gap water in the residues can be discharged in the gas injection and halogen discharging stage, part of gap space in the residues is utilized, and the volume of an effective cavity is increased. The void space in the insoluble residue may account for 20% of the total volume of the salt cavity, calculated as a packing factor of 1.5, 40% insoluble content. In the embodiment of the invention, at least half of the void space of the residues can be utilized, and the effective utilization space of the salt cavity can be improved by more than 10%.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic illustration of the present invention in a drilling phase;
FIG. 2 is a schematic view of the present invention in a cavity creation stage;
FIG. 3 is a schematic representation of the present invention in a perforating stage;
FIG. 4 is a schematic illustration of the present invention in a primary gas injection and halogen removal stage;
FIG. 5 is a schematic illustration of the present invention in a secondary stage of gas injection and halogen removal;
FIG. 6 is a schematic flow chart of the operation method for gas storage by utilizing the residual void space of the salt cavern gas storage provided by the invention.
Reference numerals:
1. a salt layer; 2. an interlayer; 3. a cavity forming well; 4. discharging a brine well from the residue; 5. a cavity; 6. residue; 7. a perforation space.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, unless otherwise specified, the embodiments and features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions and, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than here.
Referring to fig. 6, an embodiment of the present invention provides an operation method for storing gas by using a residual void space of a salt cavern gas storage, including the following steps:
s10, drilling salt cavern gas storage at intervals in parallel to obtain a cavity-making well and a residue halogen-discharging well;
s20, injecting a fresh water dissolving cavity wall into the cavity building well, building a cavity, and sealing a well mouth of the residue and halogen discharging well to perform sealing and pressure maintaining;
s30, opening a well mouth of the residue halogen discharging well, performing perforation operation on the part, which is immersed into the residues, of the cavity making layer section of the residue halogen discharging well, and closing the well mouth of the residue halogen discharging well again after the perforation operation is finished;
s40, keeping a well mouth of the perforation closed, and injecting natural gas into the cavity building well to discharge brine in a cavity of the cavity building well;
s50, opening a wellhead of the residue brine discharge well, injecting natural gas into the cavity making well, and discharging brine in the residue from the residue brine discharge well;
and S60, plugging the well head of the residue brine discharge well, and performing natural gas storage and gas production operation through the cavity-making well.
Carry out perforation operation to the pit residue through residue discharge halogen well to discharge halogen operation through residue discharge halogen well, make the gas injection and discharge halogen stage can discharge partial gap water in the residue, partial void space can utilize in the residue, has increased the volume of effective cavity. The void space in the insoluble residue may account for 20% of the total volume of the salt cavity, calculated as a packing factor of 1.5, 40% insoluble content. In the embodiment of the invention, at least half of the void space of the residue can be utilized, and the effective utilization space of the salt cavity can be improved by more than 10%.
In step S10, the cavity forming well and the residue halogen discharging well are both vertical wells, and the horizontal interval between the cavity forming well and the residue halogen discharging well is 15m to 30m. The drilling completion depths of the cavity building well and the residue brine discharge well are both the bottom burial depth of the designed cavity building layer section. And the well cementing depth of the cavity making well is 20m below the top surface buried depth of the salt layer, and the well cementing depth of the residue discharging brine well is the drilling completion depth.
The step S20 includes: and (3) a central pipe and an intermediate pipe are put into the cavity-making well, a fresh water dissolving cavity wall is injected into the cavity-making well, a cavity is made, and meanwhile, a well mouth of the residue-discharging halogen-discharging well is sealed for sealing and pressure maintaining. Wherein, when making the chamber, adopt and make the initial stage of chamber and just circulate and build the groove, make the middle and later stages circulation mode of making the chamber.
Wherein the middle pipe is a 7-inch sleeve, and the central pipe is 4 1 / 2 Inch tubing.
Specifically, step S20 further includes: in the cavity building process, a cushion layer is adopted to control the salt rock to be dissolved too fast; controlling the shape of the cavity by adopting a pipe column sectional lifting method; and detecting and monitoring the shape of the cavity by using sonar, and performing sleeve inspection and hermetic seal test after the cavity is built. The various methods of cavitation described herein are conventional in the art and will not be described in detail.
Step S30 includes: and (3) putting the perforator into the residues for sectional perforation, establishing a circulation channel between residual brine in the residues and a residue brine discharge well, and closing a well mouth of the residue brine discharge well after the perforation is finished. In the perforating process, the perforator perforates the casing and the cement sheath and injects the casing and the cement sheath into the residues to a certain depth, and a circulation channel for residual brine in the residues and a residue brine discharge well is established.
In an embodiment of the present invention, step S40 includes: a gas injection and production pipe column and a brine discharge pipe column are put in, the putting position of the brine discharge pipe column is close to the top of the residue, and a safety valve is arranged at the wellhead of the cavity building well; injecting natural gas into the annular space of the gas injection and production tubular column and the brine discharge tubular column, and discharging brine in the cavity to the ground surface through the brine discharge tubular column by using pressure; and after the brine discharge is finished, the brine discharge pipe column is lifted by using a non-killing operation method.
Step S60 includes: and closing the well mouth of the residue brine discharge well, and performing natural gas storage and gas production operation through the gas injection and production pipe column. Wherein, the gas injection and production pipe column is a 7-inch casing pipe, and the brine discharge pipe column is 4 1 / 2 Inch tubing.
Practical application examples of the present invention are as follows:
drilling phase, as shown in fig. 1. The salt cavern gas storage is built in a salt layer 1, a plurality of interlayer layers 2 are arranged in the salt layer 1, and the interlayer layers 2 mainly contain insoluble substances. And drilling a vertical well as a cavity building well 3 and drilling a vertical well as a residue brine discharging well 4. The distance between the two wells is 15m-30m, and the drilling completion depth of the two wells is the bottom burial depth of the cavity-making layer section. The well cementation depth of the cavity making well 3 is 20m below the top boundary burial depth of a salt layer, and the well cementation depth of the residue halogen discharging well 4 is the bottom boundary burial depth of a cavity making layer section.
The cavity creation stage, as shown in fig. 2. The cavity forming well 3 adopts the conventional cavity forming technology, a cavity forming body 5 is formed, and insoluble substances are stacked to form pit residues 6. The cavity making process comprises the following steps: and (3) putting a central pipe and a middle pipe into the cavity-making well, and adopting a circulation mode of cavity-making initial forward circulation groove building and cavity-making middle and later reverse circulation cavity making. And in the cavity making process, the cushion layer is used for controlling the salt rock to be dissolved too fast, the cavity form rule is controlled by a pipe column sectional lifting method, the cavity form is detected and monitored by sonar, and the casing inspection and the air sealing test are performed after the cavity making is finished.
The perforating phase, as shown in figure 3. And perforating the part of the residue halogen discharging well 4 submerged in the residue to form a perforating space 7, and sealing the well mouth of the residue halogen discharging well 4 after perforation is finished. The perforation process is a conventional perforation process in the oil and gas industry: and (3) putting the perforator into the residues for subsection perforation, perforating the casing and the cement sheath, and injecting the casing and the cement sheath into the residues for a certain depth to establish a circulation channel between residual brine in the residues and a shaft.
The primary gas injection and halogen removal stage is shown in fig. 4. The cavity-making well 3 adopts the conventional gas injection and brine discharge technology to carry out primary gas injection and brine discharge and discharge brine in the cavity space above the residues in the salt cavity. The technological process of gas injection and brine discharge comprises the following steps: the gas injection and production pipe column and the brine discharge pipe column are put in, wherein the gas injection and production pipe column is a 7-inch sleeve, and the brine discharge pipe column is 4 1 / 2 Inch tubing. And the tripping-in position of the brine discharge pipe column is close to the top of the residue, and a safety valve is arranged at the wellhead. Injecting natural gas into the annular space of the gas injection and production pipe column and the brine discharge pipe column, and discharging brine in the cavity to the ground surface by using pressure. And after the gas injection and brine discharge stage is completed, the brine discharge pipe column is lifted in a non-well killing operation mode.
And a secondary gas injection and halogen removal stage as shown in figure 5. And opening a well mouth of the residue brine discharge well 4, discharging brine by taking the residue brine discharge well casing as a brine discharge pipe column, and injecting gas by using a gas injection pipe column of the cavity forming well 3. After the brine discharge is finished, the residue brine discharge well is closed and is not used any more, and the gas injection and production pipe column of the cavity-making well is used as the gas injection and production pipe column in the gas injection and production stage for continuous use.
In fig. 4 and 5, the downward arrows indicate the gas flow direction during gas injection, and the upward arrows indicate the liquid flow direction during halogen removal.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: arrange the steamed well through the residue and carry out perforation operation to the pit residue to arrange the steamed operation of brine through the residue, make gas injection and arrange the steamed stage and can discharge partial space water in the residue, partial void space can utilize in the residue, has increased the volume of effective cavity. The void space in the insoluble residue may account for 20% of the total volume of the salt cavity, calculated as a packing factor of 1.5, 40% insoluble content. In the embodiment of the invention, at least half of the void space of the residue can be utilized, and the effective utilization space of the salt cavity can be improved by more than 10%.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. An operation method for storing gas by utilizing residue void space of a salt cavern gas storage is characterized by comprising the following steps of:
s10, drilling salt cavern gas storage at intervals in parallel to obtain a cavity-making well and a residue halogen-discharging well;
s20, injecting a fresh water dissolving cavity wall into the cavity building well, building a cavity, and sealing a well mouth of the residue halogen discharging well for sealing and pressure maintaining;
s30, opening a well mouth of the residue halogen discharging well, performing perforation operation on a part, which is immersed into the residue, of a cavity-making layer section of the residue halogen discharging well, and closing the well mouth of the residue halogen discharging well again after the perforation operation is completed;
s40, keeping a well mouth of the perforation closed, and injecting natural gas into the cavity-making well to discharge brine in a cavity of the cavity-making well;
s50, opening a well mouth of the residue brine discharge well, injecting natural gas into the cavity building well, and discharging brine in the residue from the residue brine discharge well;
and S60, plugging a well mouth of the residue brine discharge well, and performing natural gas storage and gas production operation through the cavity-making well.
2. The method as claimed in claim 1, wherein in step S10, the chamber-building well and the residue halogen discharging well are both vertical wells, and the horizontal interval between the chamber-building well and the residue halogen discharging well is 15m to 30m.
3. The method as claimed in claim 1, wherein in step S10, the cementing depth of the cavity-making well is 20m below the top surface burial depth of the salt layer, and the cementing depth of the residue-discharging brine well is the drilling completion depth.
4. The method as claimed in claim 1, wherein the step S20 comprises: and (3) putting a central pipe and an intermediate pipe into the cavity-making well, injecting a fresh water dissolving cavity wall into the cavity-making well, making a cavity, and sealing the well mouth of the residue halogen-discharging well to seal and maintain pressure.
5. The method of claim 4, wherein in step S20, the intermediate pipe is a 7-inch casing pipe, and the central pipe is a 4-inch central pipe 1 / 2 An inch tubing.
6. The method as claimed in claim 4, wherein the step S20 further comprises:
in the cavity building process, a cushion layer is adopted to control the salt rock to be dissolved too fast;
controlling the shape of a cavity of the cavity by adopting a pipe column sectional lifting method;
and detecting and monitoring the shape of the cavity by using sonar, and performing sleeve inspection and hermetic seal test after the cavity is built.
7. The method as claimed in claim 1, wherein the step S30 comprises: and (3) descending the perforator into the residues for sectional perforation, establishing a circulation channel between residual brine in the residues and the residue brine discharge well, and closing a well mouth of the residue brine discharge well after the perforation is finished.
8. The method as claimed in claim 1, wherein the step S40 comprises:
the lower position of the brine discharge pipe column is close to the top of the residue, and a safety valve is arranged at the wellhead of the cavity building well;
injecting natural gas into the annular space of the gas production pipe column and the brine discharge pipe column, and discharging brine in the cavity to the ground surface from the brine discharge pipe column by using pressure;
and after the brine discharge is finished, pulling out the brine discharge pipe column by using a non-well killing operation method.
9. The method as claimed in claim 1, wherein the step S60 comprises: and closing the well mouth of the residue brine discharge well, and performing natural gas storage and gas production operation through the gas injection and production pipe column.
10. The method of claim 9, wherein the gas injection and production string is a 7 inch casing and the brine discharge string is a 4 inch casing 1 / 2 Inch tubing.
11. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 10 when executing the computer program.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 10.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115688480A (en) * | 2022-11-18 | 2023-02-03 | 山东鲁银盐穴储能工程技术有限公司 | Method for determining sediment storage capacity of multi-interlayer salt cavern storage |
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