CN114033492B - Rapid cavity dissolving method and device for salt cavern gas storage - Google Patents
Rapid cavity dissolving method and device for salt cavern gas storage Download PDFInfo
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- CN114033492B CN114033492B CN202111317836.0A CN202111317836A CN114033492B CN 114033492 B CN114033492 B CN 114033492B CN 202111317836 A CN202111317836 A CN 202111317836A CN 114033492 B CN114033492 B CN 114033492B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 85
- 238000003860 storage Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000013505 freshwater Substances 0.000 claims abstract description 80
- 238000002347 injection Methods 0.000 claims abstract description 55
- 239000007924 injection Substances 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000005507 spraying Methods 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 19
- 239000012267 brine Substances 0.000 claims description 8
- 238000011978 dissolution method Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 239000002198 insoluble material Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 14
- 239000011435 rock Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000010276 construction Methods 0.000 description 9
- 238000004090 dissolution Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 239000000126 substance Substances 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
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
- E21B47/047—Liquid level
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
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- Geophysics And Detection Of Objects (AREA)
- Examining Or Testing Airtightness (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a rapid cavity dissolving method and cavity dissolving equipment of a salt cavern gas storage, which are used for drilling a well body with a preset depth from the ground to a bottom salt layer, circumferentially excavating the salt cavern gas storage at the preset depth position of the well body, wherein the cavity dissolving method comprises the following steps: firstly, a cavity-making main pipe consisting of an outer pipe and a central pipe double-layer pipe is lowered to a preset height position in a well body from the bottom of the well; injecting a protective liquid into the bottom of the well through the central pipe; then, fresh water is injected into the well body for the first time to obtain a cavity with a first preset size; injecting fresh water into the well body for the second time to obtain a cavity with a second preset size; and when fresh water is injected into the well body for the first time and the second time to make cavities, the injection tool and the cavity making tool with the hose are arranged to assist in cavity making so as to increase cavity making efficiency. And finally, performing size detection and sealing leakage detection tests on the cavity with the second preset size to obtain the salt cavern gas storage. The invention can be widely applied to the technical field of underground energy storage.
Description
Technical Field
The invention belongs to the technical field of underground energy storage, and particularly relates to a rapid cavity dissolving method and cavity dissolving equipment for a salt cavern gas storage.
Background
Currently, an underground gas storage is an artificial gas field (reservoir) formed by re-injecting natural gas extracted from a natural gas field (reservoir) into a reservoir space under the ground under closed conditions. Salt cavern gas storage is the underground cave that utilizes water solution exploitation salt rock to form in underground salt layer or salt dome stores oil gas. The device has the advantages of flexible operation, no leakage of gas storage, strong peak regulation capability, rapid completion of gas injection and production circulation, less gas consumption of the cushion layer, high proportion of working gas, complete recovery of cushion gas and the like. At present, the technology of salt cavern gas storage in China is still in the building or grinding stage, but underground salt caverns are formed by injecting water into a solution cavity in thicker underground salt rock, injecting clear water into a shaft to dissolve the salt rock to extract brine, and controlling the shape of the salt cavity through injecting and extracting top plate protection liquid; then, the existing method for setting up the salt cavern gas storage includes: by using the double-pipe column cavity-making method, the cavity-making pipe column has small annular space, large circulating energy consumption and small allowable maximum water injection displacement, and simultaneously two layers of cavity-making pipe columns are put in, so that the cavity-making cost is high, the cavity-making period is long, the construction cost and the construction period of the salt cavern gas storage are increased, and the domestic market demand for the salt cavern gas storage cannot be met. Therefore, the reduction of the cavity-making period and the reduction of the cavity-making cost are of great significance to the construction of the salt cavern gas storage.
Therefore, for the formation of the salt cavern gas storage by using the double-pipe column cavity-making method, the annular space clearance of the cavity-making pipe column is small, the circulating energy consumption is large, the allowable maximum water injection displacement is small, meanwhile, two layers of cavity-making pipe columns are put in, the cavity-making cost is high, the cavity-making period is long, the construction cost and the construction period of the salt cavern gas storage are increased, and the domestic market demand for the salt cavern gas storage cannot be met;
that is, how to reduce the circulation energy consumption, enhance the water injection discharge capacity, reduce the cavity-making cost and improve the cavity-making efficiency for the cavity-making method of the salt cavern gas storage is a technical problem which needs to be solved by the person skilled in the art.
Disclosure of Invention
In order to solve the above-mentioned problems, a first aspect of the present invention provides a rapid dissolution method of a salt cavern gas storage, for drilling a well body of a preset depth from the ground to a salt layer at a preset depth position of the well body, and circumferentially excavating the salt cavern gas storage, the dissolution method comprising: lowering a cavity-making main pipe to a preset height position in the well body from the bottom of the well; the cavity-making main pipe comprises an outer pipe and a central pipe arranged in the outer pipe in a coaxial manner, a distance is arranged between the outer pipe and the central pipe, and the cavity-making main pipe is lowered to a preset height position away from the bottom of the well in the well body, wherein the position comprises: firstly, lowering the outer tube to a first preset height position in the well body from the bottom of the well, then lowering the central tube to a second preset height position in the well body from the bottom of the well, and pouring brine into the central tube before lowering, wherein the first preset height position is larger than the second preset height position; injecting a protective liquid into the bottom of the well through the central pipe; injecting fresh water into the well body for the first time to obtain a cavity with a first preset size; injecting fresh water into the well body for the first time comprises the steps of injecting the fresh water into the well body through a central pipe, arranging an injection tool in the well body when the central pipe discharges water, and enabling the fresh water to perform hydraulic impact on the well wall of the well body through the injection tool so as to wash out physical particles of the well wall to the bottom of the well body to form a liquid mixture; wherein when fresh water is injected into the well through the central tube, the liquid mixture in the well is extracted from the space between the central tube and the outer tube; injecting fresh water into the well body for the second time to obtain a cavity with a second preset size; injecting fresh water into the well body for the second time comprises the steps of injecting the fresh water into the cavity body with the first preset size through the interval between the central pipe and the outer pipe, arranging a spraying tool with a hose in the well body when water is discharged from a gap between the central pipe and the outer pipe, and enabling the fresh water to perform hydraulic pressure impact on the inner wall of the cavity body with the first preset size through the spraying tool with the hose so as to wash out physical particles of the inner wall of the cavity body to the bottom of the well body to form a liquid mixture; when fresh water is injected into the cavity with the first preset size through the interval between the central tube and the outer tube, extracting the liquid mixture in the cavity with the first preset size through the central tube; and performing size detection and sealing leakage detection tests on the cavity with the second preset size to obtain the salt cavern gas storage.
In a first aspect, the outer tube is sized to:
millimeter, the size of center tube is: />
Millimeter.
In a first aspect, the lowering the outer tube to a first preset height position within the well body from bottom hole comprises: the outer tube is lowered into the well at a position within the well body at a distance of 30 meters downhole.
In a first aspect, prior to the first step of injecting fresh water into the well, the method further comprises: and mechanically expanding and excavating the inner wall of the well body.
In a first aspect, the disposing a jetting tool in the well body, and causing the fresh water to hydraulically impact the wall of the well body through the jetting tool includes: the jet tool is lowered to a preset position at the bottom of a well by using a drill string, fresh water is introduced, and the drill string is rotated at the same time, so that the jet tool or the jet tool with a hose in a water jet state is driven to synchronously rotate, and hydraulic impact is carried out on the wall of the well or the inner wall of a cavity with a first preset size correspondingly; and arranging a spraying tool with a hose in the well body, so that the fresh water can hydraulically impact the inner wall of the cavity with the first preset size through the spraying tool with the hose, wherein the spraying tool with the hose comprises: and (3) lowering the injection tool with the hose to a preset position at the bottom of the well by using the drill string, and leading fresh water into the injection tool while rotating the drill string so as to drive the injection tool in a water injection state or the injection tool with the hose to synchronously rotate, so as to perform hydraulic impact on the wall of the well or the inner wall of the cavity with the first preset size correspondingly.
In a first aspect, before lowering the jetting tool or hose-equipped jetting tool to a preset position downhole with a drill string, the method further comprises: an open caisson is drilled downhole to contain crushed stone or insoluble material impacted by the water pressure.
In a first aspect, the performing size detection on the cavity with the second preset size includes: and detecting the cavity with the second preset size by using a sonar so as to obtain the size and the shape of the cavity with the second preset size.
In a first aspect, the performing a leak test on a cavity of a second predetermined size includes: and injecting nitrogen into the cavity with the second preset size, synchronously detecting whether the liquid level surface in the cavity with the second preset size rises synchronously, and if so, judging that the cavity with the second preset size is in a sealing state.
In a second aspect, the present invention provides a rapid dissolution apparatus for a salt cavern gas storage, the apparatus comprising: the drilling device is used for drilling a well body with a preset depth from the ground to the underground salt layer; the cavity-making main pipe comprises an outer pipe and a central pipe coaxially arranged in the outer pipe, and a space is arranged between the outer pipe and the central pipe; the suspension device is arranged above the wellhead of the well body and used for lowering the cavity-making main pipe to a preset height position in the well body from the bottom of the well; the oil filling port is communicated with the central pipe and is used for filling protection liquid into the bottom hole of the well body; the first water filling port is also communicated with the central pipe and is used for filling fresh water into the well body through the central pipe so as to obtain a cavity with a first preset size; the second water injection port is arranged on the outer tube and communicated with the space between the outer tube and the central tube, and is used for injecting water into the space between the central tube and the outer tube so as to obtain a cavity with a second preset size; the injection tool is arranged in the well body and is used for enabling fresh water to hydraulically impact the well wall of the well body through the injection tool when the central pipe is discharged; the spraying tool with the hose is arranged in the well body and is used for enabling fresh water to perform hydraulic impact on the inner wall of the cavity with the first preset size through the spraying tool with the hose when water is discharged from the space between the central pipe and the outer pipe; the size detection device is used for detecting the size of the cavity with the second preset size; the sealing leakage detecting device is used for conducting sealing leakage detecting tests on the cavity with the second preset size.
In a second aspect, the apparatus further comprises: the drill string is used for lowering the injection tool or the injection tool with the hose to a preset position at the bottom of the well, and enabling the drill string to rotate while fresh water is introduced so as to drive the injection tool or the injection tool with the hose to synchronously rotate in a water injection state, so that hydraulic impact is carried out on the wall of the well or the inner wall of the cavity with the first preset size correspondingly.
The beneficial effects are that:
according to the rapid cavity dissolving method of the salt cavern gas storage, through arranging the sleeve and the central pipe coaxially sleeved in the well body, the procedures of inputting fresh water into the well body and pumping and exhausting liquid mixture in the well body are completed, when construction is carried out, fresh water is firstly injected into the well body for the first time to obtain a cavity with a first preset size, and then fresh water is injected into the well body for the second time to obtain a cavity with a second preset size; further, when fresh water is injected into the well body for the first time, an injection tool is arranged in the well body, so that the fresh water is subjected to hydraulic impact on the wall of the well body through the injection tool, and when fresh water is injected into the well body for the second time, an injection tool with a hose is arranged in the well body, so that the fresh water is subjected to hydraulic impact on the inner wall of a cavity with a first preset size through the injection tool with the hose, the inner wall of the well body is rapidly expanded, and when the fresh water is injected into the well body for the first time and the second time, liquid mixture in the well body is synchronously guided out, so that a final construction procedure of the salt cavern gas storage is completed, the cost for manufacturing the salt cavern gas storage is greatly reduced, and the cavity manufacturing process is more efficient.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a fast-dissolving method for a salt cavern gas storage according to the first embodiment;
FIG. 2 is a diagram of a salt cavern gas storage molding FIG. 1 according to a first embodiment;
FIG. 3 is a diagram of a salt cavern gas storage molding FIG. 2 according to the first embodiment;
fig. 4 is a diagram of a salt cavern gas storage molding fig. 3 according to a first embodiment;
FIG. 5 is a diagram of a salt cavern gas storage molding FIG. 4 according to a first embodiment;
reference numerals:
1. fresh water;
2. brine;
3. outer tube
4. A central tube;
5. salt cavity boundary IV of positive circulation cavity making operation;
6. salt cavity boundary III of positive cycle cavity making operation;
7. salt cavity boundary II of positive circulation cavity making operation;
8. salt cavity boundary I of positive circulation cavity making operation;
9. a jetting tool;
10. a first pipe cutting position of the cavity-making outer pipe for positive cycle cavity-making operation;
11. positive-cycle cavity-making operation cavity-making outer pipe cutting position II
12. A third position of the cavity-making outer pipe cutting pipe for positive circulation cavity-making operation;
13. a jetting tool with a hose;
14. salt cavity boundary IV of reverse circulation cavity making operation;
15. salt cavity boundary III of reverse circulation cavity making operation;
16. salt cavity boundary II of reverse circulation cavity making operation;
17. and (3) performing reverse circulation cavity making operation to form a first salt cavity boundary.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
Referring to fig. 1-5, a first embodiment of the present invention provides a fast solution method for a salt cavern gas storage, which is used for drilling a well body with a preset depth from the ground to a salt layer at the bottom of the ground, and circumferentially excavating the salt cavern gas storage at a preset depth position of the well body.
The cavity dissolving method comprises the following steps: lowering a cavity-making main pipe to a preset height position in the well body from the bottom of the well; the cavity-making main pipe comprises an outer pipe and a central pipe arranged in the outer pipe in a coaxial manner, a distance is arranged between the outer pipe and the central pipe, and the cavity-making main pipe is lowered to a preset height position away from the bottom of the well in the well body, wherein the position comprises: firstly, lowering the outer tube to a first preset height position in the well body from the bottom of the well, then lowering the central tube to a second preset height position in the well body from the bottom of the well, and pouring brine into the central tube before lowering, wherein the first preset height position is larger than the second preset height position; injecting a protective liquid into the bottom of the well through the central pipe;
injecting fresh water into the well body for the first time to obtain a cavity with a first preset size; injecting fresh water into the well body for the first time comprises the steps of injecting the fresh water into the well body through a central pipe, arranging an injection tool in the well body when the central pipe discharges water, and enabling the fresh water to perform hydraulic impact on the well wall of the well body through the injection tool so as to wash out physical particles of the well wall to the bottom of the well body to form a liquid mixture; wherein when fresh water is injected into the well through the central tube, the liquid mixture in the well is extracted from the space between the central tube and the outer tube;
injecting fresh water into the well body for the second time to obtain a cavity with a second preset size; injecting fresh water into the well body for the second time comprises the steps of injecting the fresh water into the cavity body with the first preset size through the interval between the central pipe and the outer pipe, arranging a spraying tool with a hose in the well body when water is discharged from a gap between the central pipe and the outer pipe, and enabling the fresh water to perform hydraulic pressure impact on the inner wall of the cavity body with the first preset size through the spraying tool with the hose so as to wash out physical particles of the inner wall of the cavity body to the bottom of the well body to form a liquid mixture; when fresh water is injected into the cavity with the first preset size through the interval between the central tube and the outer tube, extracting the liquid mixture in the cavity with the first preset size through the central tube; and performing size detection and sealing leakage detection tests on the cavity with the second preset size to obtain the salt cavern gas storage.
In the technical scheme, through arranging a sleeve and a central pipe coaxially sleeved in the well body, the procedures of inputting fresh water into the well body and pumping and discharging a liquid mixture in the well body are completed, when in construction, fresh water is firstly injected into the well body for the first time, so that the fresh water and a salt rock layer on the inner wall of the well body are dissolved, a cavity with a first preset size is obtained, and then fresh water is injected into the well body for the second time, so that the fresh water and the salt rock layer on the inner wall of the cavity with the first preset size are dissolved, and a cavity with a second preset size is obtained; further, when fresh water is injected into the well body for the first time, an injection tool is arranged in the well body, so that the fresh water can perform hydraulic impact on the wall of the well body through the injection tool, and when fresh water is injected into the well body for the second time, an injection tool with a hose is arranged in the well body, so that the fresh water can perform hydraulic impact on the inner wall of a cavity with a first preset size through the injection tool with the hose, the inner wall of the well body can be quickly expanded, and when fresh water is injected into the well body for the first time and the second time, liquid mixture in the well body is synchronously guided out, so that a final construction procedure of the salt cavern gas storage is completed, the cost of manufacturing the salt cavern gas storage is greatly reduced, and the cavity manufacturing process is more efficient.
Further, in this embodiment, make chamber house steward include center tube and outer tube, compare with the three-layer pipe that outer tube, inner tube and outer tube are constituteed that adopts among the prior art, the chamber house steward of this embodiment possesses the high efficiency in making the chamber technology and makes the economic nature that chamber house steward prepared, makes the chamber technology possess the high efficiency and embody in: make chamber house steward by outer tube and center tube two-layer pipe constitution for interval between outer tube and the center tube increases, when carrying out fresh water input or brine output by this interval, can satisfy bigger flow, with shorten fresh water input or brine output's time greatly, and then improved the efficiency of making the chamber, and make the economic nature of chamber house steward preparation embody in: when the cavity-making main pipe is prepared, the preparation cost and the consumed manufacturing energy are greatly reduced compared with those of the three-layer pipe in the prior art due to the fact that one-layer pipe material is reduced; therefore, compared with the prior art, the scheme of adopting the outer tube and the central tube to manufacture the cavity main pipe in the embodiment has high efficiency in cavity manufacturing process and economy in cavity manufacturing main pipe manufacture compared with the prior art.
Further, the jetting tool may employ a nozzle, and the nozzle includes: the body is provided with an inner cavity which is communicated with an external water delivery pipeline, and the body further comprises at least four first nozzles and a second nozzle, wherein the four first nozzles are circumferentially arranged at the side part of the body and are communicated with the cavity, and the second nozzle is positioned at the bottom of the body; the spraying tool with the hose is characterized in that a hose with a preset length is additionally arranged between the spray head and an external water conveying pipeline, so that the spraying distance of the spray head is increased.
As one embodiment of the outer tube and the center tube according to the first embodiment, the outer tube and the center tube may be sized by:
and the size of the central tube is set to +.>
In particular, for a method of lowering an outer tube into a well at a first preset height position from downhole, it may be achieved by embodiments comprising: the outer pipe is lowered to a position which is 30 meters away from the bottom of the well in the well body, and the height of the pipe orifice of the outer pipe needs to be synchronously lifted along with the pushing in of the cavity making process, and the pipe cutting mode can be adopted for adjusting, namely, when the height of the outlet of the outer pipe needs to be lifted, the pipe cutting device is adopted for cutting the lower length section of the outer pipe.
Specifically, in the first embodiment, before the step of injecting fresh water into the well body for the first time, an implementation manner is further provided in this embodiment, and the implementation manner includes: and the inner wall of the well body is mechanically excavated so as to increase the contact surface of the salt rock and the fresh water and accelerate the corrosion speed of the salt rock.
Specifically, based on the technical scheme that in the first embodiment, the injection tool is disposed in the well body, so that the fresh water performs hydraulic impact on the wall of the well body through the injection tool, and the injection tool with the hose is disposed in the well body, so that the fresh water performs hydraulic impact on the inner wall of the cavity with the first preset size through the injection tool with the hose, for this scheme, in order to further improve the cavity-making speed and efficiency and shorten the cavity-making period, the first embodiment proposes a specific implementation manner, which includes: the method comprises the steps that a jet tool or a jet tool with a hose is lowered to a preset position at the bottom of a well by using a drill string, fresh water is introduced, the drill string is rotated to drive the jet tool or the jet tool with the hose in a water spraying state to synchronously rotate so as to correspondingly perform water pressure impact on the wall of the well or the inner wall of a cavity with a first preset size, and when the jet tool or the jet tool with the hose is used for spraying water, the drill string rotates to drive the jet tool to synchronously rotate so as to form intermittent vortex flow, and high-frequency oscillation hydraulic waves and cavitation noise (ultrasonic waves) are generated, so that the hydraulic erosion of the wall of the well is realized, meanwhile, the fluid form in the well cavity is changed, and the dissolution of salt rock is accelerated;
further, in order to avoid using the injection tool to carry out the cavity in-process to the cavity inner wall erosion so that rubble or insoluble substance of inner wall drops to the cavity bottom, causes the cavity bottom space to be taken up, and then influences the final shaping of salt cave gas storage, in order to solve this problem, this embodiment one proposes a technical scheme, and this scheme includes: drilling an open caisson downhole to contain crushed stone or insoluble material impacted by the water pressure prior to lowering the jetting tool or the hose-carrying jetting tool to a preset position downhole with the drill string;
specifically, the step of performing the size detection on the cavity with the second preset size in the first embodiment may be performed by the following specific embodiments, where the specific embodiments include: and detecting the cavity with the second preset size by using the sonar so as to obtain the size and the shape of the cavity with the second preset size.
Meanwhile, for the scheme of performing a seal leak detection test on a cavity of a second preset size, the seal leak detection test can be completed by the following specific embodiments, which include: and injecting nitrogen into the cavity with the second preset size, synchronously detecting whether the liquid level surface in the cavity with the second preset size rises synchronously, and if so, judging that the cavity with the second preset size is in a sealing state.
With continued reference to fig. 2-5, in the early stage of cavity formation, fresh water 1 is input from a central tube 4 to the bottom of the well body to dissolve salt rock particles in the well body, and the liquid mixture after dissolution is discharged from the space between the central tube 4 and an outer tube 3 to be known, wherein the liquid mixture is brine 2 obtained by mixing fresh water with a salt rock layer; in the middle and later stages of cavity making, fresh water 1 is input to the bottom of the well body from the space between the outer pipe 3 and the central pipe 4 so as to dissolve salt rock particles in the well body, and the dissolved liquid mixture is discharged from the central pipe 4; and, utilize injection tool 9 or take injection tool 13 of hose to stretch into the internal preset altitude department of well to spray the lateral wall of well in the early stage of making the chamber and the later stage of making the chamber, through the mode of hydraulic impact, accelerate the shaping of salt cave repository, and then improve and make chamber efficiency.
For the early stages of cavity creation, as can be seen from fig. 2-5, salt pocket boundaries of different sizes are gradually formed during cavity creation, namely: positive cycle cavity creation operation salt pit boundary four 5, positive cycle cavity creation operation salt pit boundary three 6, positive cycle cavity creation operation salt pit boundary two 7, positive cycle cavity creation operation salt pit boundary one 8;
for the middle and later stages of the cavitation process, as can be seen in fig. 2-5, salt pocket boundaries of different sizes are gradually formed, namely: a fourth salt hole boundary 14 for reverse circulation cavity making operation, a 15 salt hole boundary for reverse circulation cavity making operation, a second 16 salt hole boundary for reverse circulation cavity making operation, and a first 17 salt hole boundary for reverse circulation cavity making operation;
further, in the earlier stage of cavity making, the length of the cavity making main pipe in the well body can be adjusted by adopting a pipe cutting mode, the pipe cutting time of the cavity making main pipe is used for cutting the cavity making main pipe according to the actual cavity making progress, and the pipe cutting position as shown in fig. 2-5 in the first embodiment is formed, and the pipe cutting device comprises: the first position 10 of the cavity-making outer pipe cutting pipe for the positive circulation cavity-making operation, the second position 11 of the cavity-making outer pipe cutting pipe for the positive circulation cavity-making operation and the third position 12 of the cavity-making outer pipe cutting pipe for the positive circulation cavity-making operation.
Embodiment two:
an embodiment II of the present invention provides a rapid dissolution device for a salt cavern gas storage, the device including: the device comprises a drilling device, a cavity-making main pipe, a suspension device, an oil filling port, a first water filling port, a second water filling port injection tool, a hose-equipped injection tool, a size detection device and a sealing leakage detection device, wherein the drilling device is used for drilling a well body with a preset depth from the ground to a salt layer at the bottom of the ground; the cavity-making main pipe comprises an outer pipe and a central pipe which is coaxially arranged in the outer pipe, and a space is arranged between the outer pipe and the central pipe; the suspension device is arranged above the wellhead of the well body and is used for lowering the cavity-building main pipe to a preset height position in the well body from the bottom of the well; the oil filling port is communicated with the central pipe and is used for filling protection liquid into the bottom of the well body; the first water filling port is also communicated with the central pipe and is used for filling fresh water into the well body through the central pipe so as to obtain a cavity with a first preset size; the second water injection port is arranged on the outer tube and communicated with the space between the outer tube and the central tube, and is used for injecting water into the space between the central tube and the outer tube so as to obtain a cavity with a second preset size; the spraying tool is arranged in the well body and is used for enabling fresh water to hydraulically impact the well wall of the well body through the spraying tool when the central pipe discharges water; the spraying tool with the hose is arranged in the well body and is used for discharging water at the interval between the central pipe and the outer pipe, and meanwhile, fresh water is enabled to impact the inner wall of the cavity with the first preset size through the spraying tool with the hose; the size detection device is used for detecting the size of the cavity with the second preset size; the sealing leakage detecting device is used for performing sealing leakage detecting test on the cavity with the second preset size.
Further, the cavity dissolving equipment further comprises a drill string, wherein the drill string is used for lowering the injection tool or the injection tool with the hose to a preset position at the bottom of the well, and rotating the drill string while fresh water is introduced to drive the injection tool or the injection tool with the hose in a water injection state to synchronously rotate so as to perform hydraulic impact on the wall of the well or the inner wall of the cavity with the first preset size, thereby further improving the cavity forming speed and efficiency and shortening the cavity forming period; when the drill string rotates to drive the injection tool to synchronously rotate, intermittent vortex flows are formed, and high-frequency oscillation hydraulic waves and cavitation noise (ultrasonic waves) are generated, so that the hydraulic erosion of the cavity wall is realized, meanwhile, the fluid form in the well cavity is changed, and the dissolution of salt rocks is accelerated.
Finally it should be noted that while the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments will occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and the equivalents thereof, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A rapid solution method for salt cavern gas storage, which is used for drilling a well body with preset depth from the ground to a bottom salt layer, and circumferentially excavating the salt cavern gas storage at the preset depth position of the well body, and is characterized in that the solution method comprises the following steps:
lowering a cavity-making main pipe to a preset height position in the well body from the bottom of the well; the cavity-making main pipe comprises an outer pipe and a central pipe arranged in the outer pipe in a coaxial manner, a distance is arranged between the outer pipe and the central pipe, and the cavity-making main pipe is lowered to a preset height position away from the bottom of the well in the well body, wherein the position comprises: firstly, lowering the outer tube to a first preset height position in the well body from the bottom of the well, then lowering the central tube to a second preset height position in the well body from the bottom of the well, and pouring brine into the central tube before lowering, wherein the first preset height position is larger than the second preset height position;
injecting a protective liquid into the bottom of the well through the central pipe;
injecting fresh water into the well body for the first time to obtain a cavity with a first preset size; injecting fresh water into the well body for the first time comprises the steps of injecting the fresh water into the well body through a central pipe, arranging an injection tool in the well body when the central pipe discharges water, and enabling the fresh water to perform hydraulic impact on the well wall of the well body through the injection tool so as to wash out physical particles of the well wall to the bottom of the well body to form a liquid mixture; wherein when fresh water is injected into the well through the central tube, the liquid mixture in the well is extracted from the space between the central tube and the outer tube;
injecting fresh water into the well body for the second time to obtain a cavity with a second preset size; injecting fresh water into the well body for the second time comprises the steps of injecting the fresh water into the cavity body with the first preset size through the interval between the central pipe and the outer pipe, arranging a spraying tool with a hose in the well body when water is discharged from a gap between the central pipe and the outer pipe, and enabling the fresh water to perform hydraulic pressure impact on the inner wall of the cavity body with the first preset size through the spraying tool with the hose so as to wash out physical particles of the inner wall of the cavity body to the bottom of the well body to form a liquid mixture; when fresh water is injected into the cavity with the first preset size through the interval between the central tube and the outer tube, extracting the liquid mixture in the cavity with the first preset size through the central tube; the jetting tool may employ a nozzle, the nozzle comprising: the body is provided with an inner cavity which is communicated with an external water delivery pipeline, and the body further comprises at least four first nozzles and a second nozzle, wherein the four first nozzles are circumferentially arranged at the side part of the body and are communicated with the cavity, and the second nozzle is positioned at the bottom of the body; the spraying tool with the hose is characterized in that a hose with a preset length is additionally arranged between the spray head and an external water conveying pipeline;
performing size detection and sealing leakage detection tests on the cavity with the second preset size to obtain the salt cavern gas storage; the sealing leakage detection test for the cavity with the second preset size comprises the following steps: and injecting nitrogen into the cavity with the second preset size, synchronously detecting whether the liquid level surface in the cavity with the second preset size rises synchronously, and if so, judging that the cavity with the second preset size is in a sealing state.
2. The rapid dissolution method of salt cavern gas storage of claim 1, wherein:
the outer tube has the following dimensions:
millimeter, the size of center tube is: />
Millimeter.
3. A rapid dissolution method of a salt cavern gas storage according to claim 1 wherein lowering the outer tube to a first predetermined height position within the well from downhole comprises:
the outer tube is lowered into the well at a position within the well body at a distance of 30 meters downhole.
4. A rapid dissolution method of a salt cavern gas storage according to claim 1, wherein prior to the first step of injecting fresh water into the well, the method further comprises:
and mechanically expanding and excavating the inner wall of the well body.
5. The rapid dissolution method of salt cavern gas storage of claim 1, wherein:
setting a jetting tool in the well body, and enabling fresh water to hydraulically impact the well wall of the well body through the jetting tool comprises the following steps: the jet tool is lowered to a preset position at the bottom of a well by using a drill string, fresh water is introduced, and the drill string is rotated at the same time, so that the jet tool or the jet tool with a hose in a water jet state is driven to synchronously rotate, and hydraulic impact is carried out on the wall of the well or the inner wall of a cavity with a first preset size correspondingly;
the method comprises the steps of,
setting up the injection instrument of taking the hose in the well body, make fresh water carry out the hydraulic pressure through the injection instrument of taking the hose to the inner wall of the cavity of first default size includes: and (3) lowering the injection tool with the hose to a preset position at the bottom of the well by using the drill string, and leading fresh water into the injection tool while rotating the drill string so as to drive the injection tool in a water injection state or the injection tool with the hose to synchronously rotate, so as to perform hydraulic impact on the wall of the well or the inner wall of the cavity with the first preset size correspondingly.
6. The rapid dissolution method of a salt cavern gas storage of claim 5, wherein prior to lowering the jetting tool or hose-in jetting tool to a predetermined location downhole with a drill string, the method further comprises:
an open caisson is drilled downhole to contain crushed stone or insoluble material impacted by the water pressure.
7. The rapid dissolution method of salt cavern gas storage of claim 1, wherein the size detection of the second predetermined size of the cavity comprises:
and detecting the cavity with the second preset size by using a sonar so as to obtain the size and the shape of the cavity with the second preset size.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4488834A (en) * | 1982-11-17 | 1984-12-18 | Empak, Inc. | Method for using salt deposits for storage |
| CN101881151B (en) * | 2010-07-02 | 2012-12-26 | 太原理工大学 | Rapid solution construction method for rock salt cavity |
| CN108533319A (en) * | 2018-03-26 | 2018-09-14 | 中国石油天然气集团有限公司 | Salt hole air reserved storeroom single tube column makes cavity method |
| US11187044B2 (en) * | 2019-12-10 | 2021-11-30 | Saudi Arabian Oil Company | Production cavern |
| CN113090242A (en) * | 2021-05-07 | 2021-07-09 | 江苏省制盐工业研究所有限公司 | Method for constructing salt cavern storage by directional floating pipes |
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Inventor after: Zhao Kai Inventor after: Ma Hongling Inventor after: Yang Xiaoping Inventor after: Yang Chunhe Inventor after: Li Yinping Inventor after: Shi Xilin Inventor after: Li Peng Inventor after: Liu Xin Inventor before: Zhao Kai Inventor before: Ma Hongling Inventor before: Yang Chunhe Inventor before: Li Yinping Inventor before: Shi Xilin Inventor before: Li Peng Inventor before: Liu Xin |