CN117468909A - Method for injecting gas and producing cavity and expanding capacity of salt cavern gas storage - Google Patents
Method for injecting gas and producing cavity and expanding capacity of salt cavern gas storage Download PDFInfo
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- CN117468909A CN117468909A CN202210867079.2A CN202210867079A CN117468909A CN 117468909 A CN117468909 A CN 117468909A CN 202210867079 A CN202210867079 A CN 202210867079A CN 117468909 A CN117468909 A CN 117468909A
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- 238000003860 storage Methods 0.000 title claims abstract description 189
- 150000003839 salts Chemical class 0.000 title claims abstract description 186
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 232
- 238000004519 manufacturing process Methods 0.000 claims abstract description 158
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 138
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 104
- 150000002367 halogens Chemical class 0.000 claims abstract description 104
- 239000003345 natural gas Substances 0.000 claims abstract description 69
- 238000002347 injection Methods 0.000 claims abstract description 53
- 239000007924 injection Substances 0.000 claims abstract description 53
- 239000012267 brine Substances 0.000 claims abstract description 39
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 39
- 238000007599 discharging Methods 0.000 claims abstract description 21
- 239000002904 solvent Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims description 19
- 238000005516 engineering process Methods 0.000 claims description 16
- 238000000605 extraction Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000002981 blocking agent Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000029087 digestion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003112 inhibitor Substances 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
- 239000011435 rock Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the technical field of salt cavern gas storage, in particular to a method for gas injection and production and cavity expansion of a salt cavern gas storage, which comprises the following steps: the method comprises the steps of feeding a first production pipe and a second production pipe, discharging brine in the salt cavern gas storage through a first brine discharge pipe, and injecting and extracting natural gas in the salt cavern gas storage; the method comprises the steps of enabling the pressure of natural gas in a salt cavern gas storage to be reduced to the minimum, injecting a solvent resistance into the salt cavern gas storage by using the first well and/or the second well, injecting water into the salt cavern gas storage by using any one of the first halogen discharge pipe and the second halogen discharge pipe, and discharging halogen by using the other halogen discharge pipe so as to expand the capacity of the salt cavern gas storage, and injecting and producing the natural gas in the expanded salt cavern gas storage. The natural gas injection and production can be performed in advance before the cavity formation of the salt cavern gas storage is completed, namely, the production is performed in advance, and the cavity formation and capacity expansion of the salt cavern gas storage can be continuously performed after the injection and production operation.
Description
Technical Field
The invention relates to the technical field of salt cavern gas storage, in particular to a method for injecting and producing gas and expanding the capacity of a cavity of a salt cavern gas storage.
Background
The new well of the salt cavern gas storage has long cavity making time and late production time. The cavity is manufactured by using the displacement of 100 square/hour, the cavity with the volume of 20 square is built for about 2-3 years, the cavity with the volume of 40 square is built for 5-6 years, the cavity manufacturing speed can be improved by adopting double-well cavity manufacturing, but the cavity with the volume of 40 square is built for 2-3 years. The cavity making time is long, and the production time is late, which is unfavorable for project construction. Although the method of increasing the size of the well bore and increasing the cavity-making displacement can increase the cavity-making speed, the method is limited by the digestion amount of brine and the concentration of brine.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for injecting gas and expanding the capacity of a cavity by using gas injection and production of a salt cavern gas storage aiming at the defects of the prior art.
The invention relates to a method for injecting and producing gas and expanding cavity of a salt cavern gas storage, which comprises the following steps:
s1, a first production pipe is put into a first well of a salt cavern gas storage which is subjected to solution dripping by adopting a double-well cavity-making technology, and a second production pipe is put into a second well of the salt cavern gas storage;
s2, a first halogen discharge pipe is arranged in the first production pipe, the lower end of the first halogen discharge pipe extends into brine in the salt cavern gas storage, natural gas is injected into the salt cavern gas storage by utilizing at least one of the first well and the second well, and brine in the salt cavern gas storage is discharged through the first halogen discharge pipe until the halogen discharge is finished;
s3, taking out a first halogen discharge pipe after halogen discharge is finished, and injecting and extracting natural gas in the salt cavern gas storage by using the first production pipe and the second production pipe;
s4, stopping injection and extraction of the natural gas in the salt cavern gas storage when the salt cavern gas storage is subjected to cavity making and capacity expansion, and carrying out extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum;
s5, putting the first halogen discharge pipe into the first production pipe, putting the second halogen discharge pipe into the second production pipe, injecting a solvent blocking agent into the salt cavern gas storage through a first annular gap between the first production pipe and the first halogen discharge pipe and a second annular gap between the second production pipe and the second halogen discharge pipe, injecting water into the salt cavern gas storage through any one halogen discharge pipe of the first halogen discharge pipe and the second halogen discharge pipe, and discharging halogen through the other halogen discharge pipe;
s6, repeatedly executing S5 to expand the salt cavern gas storage;
s7, repeatedly executing S2 and S3 on the expanded salt cavern gas storage to carry out injection and production on natural gas in the expanded salt cavern gas storage.
The method for injecting and producing gas and expanding the cavity of the salt cavern gas storage has the following beneficial effects:
the invention breaks through the conventional procedures of cavity making, gas injection, halogen discharging, injection and production operation of the gas storage building sequence, and provides a rolling process sequence of cavity making, gas injection, halogen discharging, injection and production operation and cavity making. The technology meets the requirements of accelerating the production of the new building cavity and reconstructing the gas storage by the old cavity, and simultaneously can meet the requirements of continuing the corrosion of the new cavity after the production to enlarge the volume, continuing the corrosion of the old cavity after the production to repair the shape, and increasing the volume of the cavity and the capacity and the working capacity of the gas storage.
Based on the scheme, the method for injecting and producing gas and producing cavity expansion of the salt cavern gas storage can be improved as follows.
Further, the extracting the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum, including:
s40, carrying out primary extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to a preset minimum operating pressure;
s41, the first halogen discharge pipe is placed in the first production pipe and/or the second halogen discharge pipe is placed in the second production pipe, water is injected into the salt cavern gas storage through the first halogen discharge pipe and/or the second production pipe, and natural gas is continuously discharged through a first annular gap between the first production pipe and the first halogen discharge pipe and/or a second annular gap between the second production pipe and the second halogen discharge pipe until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum.
Further, the step S1 further includes:
and taking out the cavity-making tube in the first well and the cavity-making tube in the second well of the salt cavern gas storage which is subjected to solution dripping by adopting a double-well cavity-making technology.
Further, the step S1 further includes:
a first subsurface safety valve is disposed at a location of the first production tubing proximate the surface.
Further, the step S1 further includes:
and a second subsurface safety valve is arranged at a position, close to the ground, of the second production pipe.
Further, the step S1 further includes: a first packer is set at the lower end of the first production tubing.
Further, the first packer is a permanent packer.
Further, the step S1 further includes: and a second packer is arranged at the lower end of the second production pipe.
Further, the solvent resistance is: diesel or nitrogen.
Further, the salt cavern gas storage is: newly built salt cavern gas storage, or, to the old chamber of well.
The beneficial effects of adopting the further scheme are as follows: the benefit of building the well old cavity can be exerted to the greatest extent.
Drawings
FIG. 1 is a schematic flow chart of a method for gas injection and production and cavity expansion of a salt cavern gas storage according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a first gas injection and halogen removal structure;
FIG. 3 is a schematic diagram of a first production injection;
FIG. 4 is a schematic diagram of a structure for cavity creation and capacity expansion;
FIG. 5 is a schematic diagram of a secondary production injection;
in the drawings, the list of components represented by the various numbers is as follows:
1. a first well; 2. a first production tube; 3. a first halogen discharge pipe; 4. a first packer; 5. a second well; 6. a second production tube; 7. a second packer; 8. brine; 9. a pit; 10. a first annular void; 11. a second annular void; 12. and a second halogen discharge pipe.
Detailed Description
As shown in fig. 1, the method for injecting and producing gas and producing cavity and expanding capacity of the salt cavern gas storage according to the embodiment of the invention comprises the following steps:
s1, a first production pipe 2 is put into a first well 1 of a salt cavern gas storage which adopts a double-well cavity-making technology for solution and dripping, and a second production pipe 6 is put into a second well 5 of the salt cavern gas storage, wherein the production pipes can be called gas production pipes, namely a first gas production pipe and a second gas production pipe.
S2, a first halogen discharge pipe 3 is arranged in the first production pipe 2, the lower end of the first halogen discharge pipe 3 extends into brine 8 of the salt cavern gas storage, natural gas is injected into the salt cavern gas storage through at least one well of the first well 1 and the second well 5, so that brine 8 in the salt cavern gas storage is discharged through the first halogen discharge pipe 3 until the halogen discharge is finished, as shown in fig. 2, at the moment, a pit 9 is remained in the salt cavern gas storage, and the pit comprises silt, broken stone, residual brine and the like.
The concrete implementation process of injecting natural gas into the salt cavern gas storage by utilizing at least one well of the first well 1 and the second well 5 comprises the following steps: natural gas is injected into the salt cavern gas storage by using the annular gap between the first brine discharge pipe 3 and the first production pipe 2 or the second production pipe 6.
S3, after the halogen discharge is finished, taking out the first halogen discharge pipe 3, and injecting and extracting natural gas in the salt cavern gas storage by utilizing the first production pipe 2 and the second production pipe 6, as shown in FIG. 3;
s4, stopping injection and extraction of the natural gas in the salt cavern gas storage when cavity building and capacity expansion are carried out on the salt cavern gas storage, and carrying out extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum;
s5, a first halogen discharge pipe 3 is arranged in the first production pipe 2, a second halogen discharge pipe 12 is arranged in the second production pipe 6, a solvent blocking agent is injected into the salt cavern gas storage through a first annular gap between the first production pipe and the first halogen discharge pipe 3 and a second annular gap between the second production pipe 6 and the second halogen discharge pipe 12, and water is injected into the salt cavern gas storage through any one halogen discharge pipe of the first halogen discharge pipe 3 and the second halogen discharge pipe 12, and halogen is discharged through the other halogen discharge pipe;
s6, repeatedly executing the step S5 to expand the capacity of the salt cavern gas storage; after the first brine discharge pipe 3 and the second brine discharge pipe 124 are placed, water is injected through one brine discharge pipe, brine is discharged through the other brine discharge pipe, and salt rocks in the salt cavern gas storage are circularly and reciprocally eroded, so that the volume of the salt cavern gas storage is enlarged, as shown in fig. 4.
S7, repeatedly executing S2 and S3 on the expanded salt cavern gas storage to perform injection and production on natural gas in the expanded salt cavern gas storage, as shown in FIG. 5. That is, the first and second halogen pipes 3 and 12 are taken out, and the natural gas in the salt cavern gas storage is injected and extracted secondarily by using the first and second production pipes 2 and 6.
The natural gas injection and production can be performed in advance before the cavity formation of the salt cavern gas storage is completed, namely, the production is performed in advance, and after the injection and production operation, the cavity formation and capacity expansion of the salt cavern gas storage can be continuously performed so as to enlarge the volume of the salt cavern gas storage, so that the salt cavern gas storage can realize the switching between the gas injection and production and the cavity formation until the volume of the salt cavern gas storage reaches the preset design volume.
The invention breaks through the conventional procedures of cavity making, gas injection, halogen discharging, injection and production operation of the gas storage building sequence, and provides a rolling process sequence of cavity making, gas injection, halogen discharging, injection and production operation and cavity making. The technology meets the requirements of accelerating the production of the new building cavity and reconstructing the gas storage by the old cavity, and simultaneously can meet the requirements of continuing the corrosion of the new cavity after the production to enlarge the volume, continuing the corrosion of the old cavity after the production to repair the shape, and increasing the volume of the cavity and the capacity and the working capacity of the gas storage.
Optionally, in the above technical solution, the extracting process is performed on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is minimized, including:
s40, carrying out primary extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to a preset minimum operating pressure, wherein the minimum operating pressure represents: the lower limit of the operation pressure of safe and stable injection and production can be carried out on the natural gas in the salt cavern gas storage;
s41, a first halogen discharge pipe 3 is arranged in the first production pipe 2 and/or a second halogen discharge pipe 12 is arranged in the second production pipe 6, water is injected into the salt cavern gas storage through the first halogen discharge pipe 3 and/or the second production pipe 6, and natural gas is continuously discharged through a first annular gap 10 between the first production pipe 2 and the first halogen discharge pipe 3 and/or a second annular gap 1 between the second production pipe 6 and the second halogen discharge pipe 12 until the pressure of the natural gas in the salt cavern gas storage is minimized.
Optionally, in the above technical solution, S1 further includes:
and taking out the cavity-making tube in the first well 1 and the cavity-making tube in the second well 5 of the salt cavern gas storage which are subjected to solution dripping by adopting a double-well cavity-making technology.
Optionally, in the above technical solution, S1 further includes:
a first subsurface safety valve is provided at a location of the first production tubing 2 near the surface.
Optionally, in the above technical solution, S1 further includes:
a second subsurface safety valve is provided at a location of the second production tubing 6 near the surface.
Optionally, in the above technical solution, S1 further includes: a first packer 4 is provided at the lower end of the first production tubing 2.
Alternatively, in the above solution, the first packer 4 is a permanent packer.
Optionally, in the above technical solution, S1 further includes: a second packer 7 is provided at the lower end of the second production tubing 6.
Optionally, in the above technical solution, the solvent inhibitor is: diesel or nitrogen.
Optionally, in the above technical solution, the salt cavern gas storage is: newly built salt cavern gas storage, or, to the old chamber of well. At present, the old cavity construction of the salt cavern gas storage often has the phenomenon that the cavity shape is irregular and the upper salt layer is insufficient in corrosion, the old cavity is required to be depressurized for operation after the gas storage is rebuilt due to the irregular cavity shape, the upper salt layer is not corroded to cause the construction resource waste, the benefit of the old cavity construction is not exerted to the greatest extent, and the benefit of the old cavity construction of the well can be exerted to the greatest extent. Specifically:
the new well of the salt cavern gas storage has long cavity making time and late production time. The cavity is manufactured by using the displacement of 100 square/hour, the cavity with the volume of 20 square is built for about 2-3 years, the cavity with the volume of 40 square is built for 5-6 years, the cavity manufacturing speed can be improved by adopting double-well cavity manufacturing, but the cavity with the volume of 40 square is built for 2-3 years. The cavity making time is long, and the production time is late, which is unfavorable for project construction. Although the method of increasing the size of the well bore and increasing the cavity-making displacement can increase the cavity-making speed, the method is limited by the digestion amount of brine and the concentration of brine. Therefore, other methods must be employed to speed up the progress of the production construction. In addition, the old cavity of the salt cavern gas storage is often built with irregular cavity shapes, the upper salt layer is not sufficiently eroded, the old cavity is rebuilt to be operated under reduced pressure due to irregular cavity shapes, the upper salt layer is not eroded to cause the waste of building resources, the benefit of building the old cavity is not exerted to the greatest extent, and the benefit of building the old cavity of the well can be exerted to the greatest extent through the invention.
The following describes in detail the method of gas injection and production and cavity expansion of a salt cavern gas storage according to the present invention by means of an embodiment, specifically:
s100, when the volume of the salt cavern gas storage which is subjected to solution dripping by adopting a double-well cavity-making technology does not reach the preset design volume, taking out a cavity-making pipe in a first well 1 and a cavity-making pipe in a second well 5 of the salt cavern gas storage which is subjected to solution dripping by adopting the double-well cavity-making technology, wherein the salt cavern gas storage is: newly-built salt cavern gas storage, or to the old chamber of well, specifically can be: newly built salt cavern gas storage by using a double-well cavity-making technology, or an old well cavity formed by corrosion of the well cavity-making technology;
s101, a first production pipe 2 is put into a first well 1 of a salt cavern gas storage which is subjected to solution dripping by adopting a double-well cavity-making technology, and a second production pipe 6 is put into a second well 5 of the salt cavern gas storage, wherein the put-in depths of the first production pipe 2 and the second production pipe 6 are designed according to the top depth of the salt cavern gas storage which is finally reached by corrosion of the salt cavern gas storage, and are generally positioned 15-20 m above the top depth of the salt cavern gas storage, namely, the lower ends of the first production pipe 2 and the second production pipe 6 are positioned 15-20 m above the final design top depth of the salt cavern gas storage;
s102, a first subsurface safety valve is arranged at a position, close to the ground, of the first production pipe 2, a second subsurface safety valve is arranged at a position, close to the ground, of the second production pipe 6, a first packer 4 is arranged at the lower end of the first production pipe 2, a second packer 7 is arranged at the lower end of the second production pipe 6, and permanent packers can be selected for the first packer 4 and the second packer 7.
S103, a first halogen discharge pipe 3 is arranged in the first production pipe 2, the lower end of the first halogen discharge pipe 3 extends into brine 8 in the salt cavern gas storage, the lower end of the first halogen discharge pipe 3 is in a maximum halogen discharge depth, natural gas is injected into the salt cavern gas storage by utilizing at least one well of the first well 1 and the second well 5, so that the brine 8 in the salt cavern gas storage is discharged through the first halogen discharge pipe 3 until the halogen discharge is finished, and the natural gas is injected into at least one well of the first well 1 and the second well 5 in the following specific implementation modes:
natural gas is injected into the salt cavern gas storage through the gap between the first well 1 and the first production pipe 2, natural gas is injected into the salt cavern gas storage through the gap between the second well 5 and the second production pipe 6, natural gas is injected into the salt cavern gas storage through the first annular gap 10 between the first production pipe 2 and the first halogen discharge pipe 3, natural gas is injected into the salt cavern gas storage through the second annular gap 1 between the second production pipe 6 and the second halogen discharge pipe 12, and the like.
When the volume of the salt cavern gas storage reaches 30% of the preset design volume, the cavity making pipe is taken out and is put into a state after the production pipe and the safety valve packer, and then the first gas injection and halogen discharge are carried out.
Wherein, when the brine 8 is not discharged through the first brine discharge pipe 3, the brine discharge is considered to be ended, or when the flow rate of the brine discharged through the first brine discharge pipe 3 is smaller than the preset flow rate, the brine discharge is considered to be ended;
s104, after the halogen discharge is finished, taking out the first halogen discharge pipe 3, and injecting and extracting natural gas in the salt cavern gas storage by utilizing the first production pipe 2 and the second production pipe 6; injection and production are daily production and comprise the processes of injecting natural gas into a salt cavern gas storage by utilizing a ground compressor and opening a wellhead of the salt cavern gas storage to produce the natural gas.
S105, after the salt cavern gas storage is injected and produced for a period of time, stopping injecting and producing gas according to production requirements, continuously creating a cavity, and expanding the volume of the salt cavern gas storage, and stopping injecting and producing the natural gas in the salt cavern gas storage when the salt cavern gas storage is subjected to cavity creation and capacity expansion, and carrying out extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum; specifically:
carrying out primary extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to a preset minimum operating pressure; that is, the natural gas in the salt cavern gas storage is first extracted to the maximum extent until the pressure of the natural gas in the salt cavern gas storage is reduced to a preset minimum operating pressure. And (2) putting the first halogen discharge pipe 3 into the first production pipe 2 and/or putting the second halogen discharge pipe 12 into the second production pipe 6, injecting water into the salt cavern gas storage through the first halogen discharge pipe 3 and/or the second production pipe 12, and continuously discharging natural gas through a first annular gap 10 between the first production pipe 2 and the first halogen discharge pipe 3 and/or a second annular gap 11 between the second production pipe 6 and the second halogen discharge pipe 12 until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum.
S106, injecting a solvent resistant agent into the salt cavern gas storage by using the first well 1 and/or the second well 5, specifically injecting the solvent resistant agent from the wellhead of the first well 1 and/or the second well 5, injecting the solvent resistant agent into the first annular gap 10 which is an annular space between the first production pipe 2 and the first halogen discharge pipe 3, or injecting the solvent resistant agent into the second annular gap 11 which is an annular space between the second production pipe 6 and the second halogen discharge pipe 12, injecting water into the salt cavern gas storage by using any halogen discharge pipe of the first halogen discharge pipe 3 and the first halogen discharge pipe 3, and discharging halogen by using another halogen discharge pipe, specifically:
for example, according to the design scheme of the cavity making of the salt cavern gas storage, the halogen discharging pipe 11 is put into the second well 5 to the design position, the first well 1 adjusts the original halogen discharging pipe 3 to the design position, diesel oil or nitrogen is injected into the two wells as a solvent resistance, one well is injected with water, the other well discharges halogen, the cavity is circularly made, and the cavity is subjected to morphological repair and volume expansion. According to the design of the cavity, the running depth of the two halogen discharging pipes is adjusted periodically to control the shape and the progress of the cavity.
S107, repeatedly executing S106 to expand the volume of the salt cavern gas storage, and repairing the form of the salt cavern gas storage.
S108, repeatedly executing S103 and S104 on the expanded salt cavern gas storage to perform injection and production on natural gas in the expanded salt cavern gas storage so as to realize the operation of putting the salt cavern gas storage into production again;
and (S103) to S108 are circulated, so that the processes of cavity making, first gas injection and brine discharging, first injection and production operation, water injection and gas discharging, second cavity making, second gas injection and brine discharging and second injection and production operation are realized until the cavity reaches the preset design volume in the cavity making design scheme until the volume of the salt cavern gas storage reaches the preset design volume.
The invention breaks through the conventional procedures of cavity making, gas injection, halogen discharging and injection and production operation of the salt cavern gas storage building sequence, and provides a rolling process sequence of cavity making, gas injection, halogen discharging, injection and production operation and cavity making. The technology meets the requirements of accelerating the production of the new building cavity and reconstructing the old cavity into the gas storage for quick production, and simultaneously can meet the requirements of continuing to erode the new cavity after the production to expand the volume, and continuing to erode the old cavity after the production of the old cavity for morphological repair, and increasing the volume of the salt cavern gas storage and the capacity and the working capacity of the gas storage.
The beneficial effects of the method for injecting and producing gas and producing cavity and expanding the capacity of the salt cavern gas storage are described by the following data:
the stratum design cavity-making layer section of a certain mining area is 1500 m-1700 m, the effective volume of the cavity is designed to be 40 square, namely the preset design volume of the salt cavern gas storage is 40 square, the solution dripping is carried out by adopting a double-well cavity-making technology, namely the construction is carried out by adopting a double-well cavity-making technology, the cavity is made by adopting 7"+7" tubular columns in a convection manner, and the total cavity-making corrosion time is designed to be 3 years, namely three years are consumed in calculation, so that the volume of the salt cavern gas storage reaches 40 square;
starting the cavity-making engineering of the salt cavern gas storage, whenWhen the effective cavitation volume reaches 12 square meters (1/3 of the total cavitation volume), the cavitation is finished. That is, when the volume of the salt cavern gas storage reaches 12 square, stopping cavity creation; and taking out the 7 'cavity-making pipe column of the two wells, putting in the 7' production pipe column, and respectively putting in a downhole safety valve and a permanent packer, wherein the depth of the production pipe is 1480m. Into the first well 14 1 / 2 And (3) the airtight brine discharge pipe is placed into the salt cavern gas storage until the brine discharge maximum depth (2 m above the pit) is reached, gas injection and brine discharge operation is carried out, natural gas is injected into the second well 5 well, and brine 8 is discharged from the brine discharge pipe of the first well 1 until brine discharge is finished.
And taking out the halogen discharging pipe 3 of the first well 1, and enabling the salt cavern gas storage to enter a production running state. Production and gas injection operations are performed through the second well 57 "production tubing and the 7" production tubing of the first well 1.
After the injection and production operation is performed for a plurality of years, the salt cavern gas storage is re-subjected to cavity building according to production requirements, and the method specifically comprises the steps of repairing the cavity form of the salt cavern gas storage, and expanding the cavity volume of the salt cavern gas storage, namely expanding the volume of the salt cavern gas storage. When the pressure of the salt cavern gas storage is reduced to the lower limit pressure, that is, until the pressure of the natural gas in the salt cavern gas storage is reduced to the preset minimum operating pressure, fresh water is injected from the first well 1, and the second well 5 continues to produce gas until the natural gas is mostly produced. The first well is re-run in 4 1 / 2 Halogen discharging pipe and simultaneous lowering 4 in second well 5 1 / 2 "brine discharge string through first well 14 1 / 2 "tubing string and second well 54 1 / 2 ' the pipe column is used for circularly forming cavities, and 4 of two wells are adjusted according to the cavity forming design 1 / 2 And (3) the pipe column is placed into depth, and the cavity shape of the salt cavern gas storage is eroded and controlled until the volume of the salt cavern gas storage reaches 40 square design volume.
The gas injection and halogen discharge are carried out again, and two wells 4 1 / 2 "tubular string is run to maximum depth, natural gas is injected into annulus of two wells, and natural gas is injected into annulus of two wells from 4 1 / 2 Discharging brine 8 from the tubular column until the gas injection and brine discharge are finished, and taking out 4 under pressure 1 / 2 Column and salt pit storageAnd (5) re-entering the production running state of the gas warehouse.
Those skilled in the art will appreciate that the present invention may be implemented as a system, method, or computer program product.
In the present disclosure, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The method for injecting and producing gas and producing cavity and expanding the capacity of the salt cavern gas storage is characterized by comprising the following steps of:
s1, a first production pipe is put into a first well of a salt cavern gas storage which is subjected to solution dripping by adopting a double-well cavity-making technology, and a second production pipe is put into a second well of the salt cavern gas storage;
s2, a first halogen discharge pipe is arranged in the first production pipe, the lower end of the first halogen discharge pipe extends into brine in the salt cavern gas storage, natural gas is injected into the salt cavern gas storage by utilizing at least one of the first well and the second well, and brine in the salt cavern gas storage is discharged through the first halogen discharge pipe until the halogen discharge is finished;
s3, taking out a first halogen discharge pipe after halogen discharge is finished, and injecting and extracting natural gas in the salt cavern gas storage by using the first production pipe and the second production pipe;
s4, stopping injection and extraction of the natural gas in the salt cavern gas storage when the cavity-making capacity expansion is carried out on the salt cavern gas storage, and carrying out extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum;
s5, putting the first halogen discharge pipe into the first production pipe, putting the second halogen discharge pipe into the second production pipe, injecting a solvent blocking agent into the salt cavern gas storage through a first annular gap between the first production pipe and the first halogen discharge pipe and a second annular gap between the second production pipe and the second halogen discharge pipe, injecting water into the salt cavern gas storage through any one halogen discharge pipe of the first halogen discharge pipe and the second halogen discharge pipe, and discharging halogen through the other halogen discharge pipe;
s6, repeatedly executing S5 to expand the salt cavern gas storage;
s7, repeatedly executing S2 and S3 on the expanded salt cavern gas storage to carry out injection and production on natural gas in the expanded salt cavern gas storage.
2. A method of gas injection and production and cavity expansion in a salt cavern gas storage as claimed in claim 1 wherein said subjecting natural gas in said salt cavern gas storage to a production process until the pressure of natural gas in said salt cavern gas storage is minimized comprises:
s40, carrying out primary extraction treatment on the natural gas in the salt cavern gas storage until the pressure of the natural gas in the salt cavern gas storage is reduced to a preset minimum operating pressure;
s41, the first halogen discharge pipe is placed in the first production pipe and/or the second halogen discharge pipe is placed in the second production pipe, water is injected into the salt cavern gas storage through the first halogen discharge pipe and/or the second production pipe, and natural gas is continuously discharged through a first annular gap between the first production pipe and the first halogen discharge pipe and/or a second annular gap between the second production pipe and the second halogen discharge pipe until the pressure of the natural gas in the salt cavern gas storage is reduced to the minimum.
3. A method for gas injection and production and cavity expansion of a salt cavern gas storage according to claim 1, wherein S1 further comprises:
and taking out the cavity-making tube in the first well and the cavity-making tube in the second well of the salt cavern gas storage which is subjected to solution dripping by adopting a double-well cavity-making technology.
4. The method for gas injection and production and cavity expansion of a salt cavern gas storage according to claim 1, wherein the step S1 further comprises:
a first subsurface safety valve is disposed at a location of the first production tubing proximate the surface.
5. The method for gas injection and production and cavity expansion of a salt cavern gas storage according to claim 1, wherein the step S1 further comprises:
and a second subsurface safety valve is arranged at a position, close to the ground, of the second production pipe.
6. The method for gas injection and production and cavity expansion of a salt cavern gas storage according to claim 1, wherein the step S1 further comprises: a first packer is set at the lower end of the first production tubing.
7. The method for gas injection and production and cavity expansion of a salt cavern gas storage of claim 6 wherein the first packer is a permanent packer.
8. The method for gas injection and production and cavity expansion of a salt cavern gas storage according to claim 1, wherein the step S1 further comprises: and a second packer is arranged at the lower end of the second production pipe.
9. The method for gas injection and production and cavity expansion of a salt cavern gas storage according to claim 1, wherein the solvent resistance is: diesel or nitrogen.
10. A method of gas injection and production and cavity expansion of a salt cavern gas storage according to any one of claims 1 to 9 wherein the salt cavern gas storage is: newly built salt cavern gas storage, or, to the old chamber of well.
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| CN202210867079.2A CN117468909A (en) | 2022-07-22 | 2022-07-22 | Method for injecting gas and producing cavity and expanding capacity of salt cavern gas storage |
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| CN202210867079.2A CN117468909A (en) | 2022-07-22 | 2022-07-22 | Method for injecting gas and producing cavity and expanding capacity of salt cavern gas storage |
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