CN117178106A - Method for forming underground reservoirs in rock salt formations - Google Patents
Method for forming underground reservoirs in rock salt formations Download PDFInfo
- Publication number
- CN117178106A CN117178106A CN202280028876.XA CN202280028876A CN117178106A CN 117178106 A CN117178106 A CN 117178106A CN 202280028876 A CN202280028876 A CN 202280028876A CN 117178106 A CN117178106 A CN 117178106A
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- China
- Prior art keywords
- vertical
- borehole
- salt
- production string
- string
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 235000002639 sodium chloride Nutrition 0.000 title claims abstract description 54
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 38
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 10
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 21
- 238000005755 formation reaction Methods 0.000 title description 33
- 150000003839 salts Chemical class 0.000 claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 claims abstract description 36
- 239000002904 solvent Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000000725 suspension Substances 0.000 claims description 26
- 239000012267 brine Substances 0.000 claims description 21
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 19
- 238000004090 dissolution Methods 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000010276 construction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241000566515 Nedra Species 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G5/00—Storing fluids in natural or artificial cavities or chambers in the earth
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention relates to the formation of underground tunnel reservoirs by dissolving rock salt through vertical and vertical/horizontal drilling. In an initial step, a production string consisting of two suspended columns is installed in a vertical borehole, a non-solvent is injected into the borehole, and a preparation opening is created, the size of which allows communication between the vertical borehole and the vertical/horizontal borehole. The point at which water is supplied into the opening formed below is periodically moved by installing the packer in the production string of a vertical/horizontal borehole and then perforating the string before the packer. The level of non-solvent in the vertical borehole is periodically raised to prevent exposure of the top of the salt formation near the bottom of the casing string. The present invention enables to increase the efficiency of forming a reservoir and to provide a high reservoir capacity.
Description
Technical Field
The technical solution of the present invention relates to the construction of underground reservoirs (reservorios) by drilling holes in rock salt and dissolving salt, which can be used in the petroleum, natural gas and chemical industries to build underground reservoirs and to extract salt through the drilling holes.
Background
The prior art discloses a method of constructing an underground tunnel reservoir in a rock salt formation of limited thickness, the method involving: drilling vertical and directional (vertical/horizontal) boreholes, wherein the directional (vertical/horizontal) boreholes are horizontally oriented near the bottom of the salt formation; installing a casing and a production string in the borehole, and borehole coupling through the salt formation; the non-solvent is injected and water is supplied through the production string of the directional drilling to dissolve the rock, and brine is extracted through the production string in the vertical drilling (russian patent No. 2258652, publication date: 8/20/2005, IPC 7b65g 5/00, e21b 7/06).
One disadvantage of this method is that the salt dissolution is not uniform along the length of the tunnel reservoir, as the most intense dissolution occurs above the bottom end of the string (shoe) of the directional (vertical/horizontal) borehole, while the least intense dissolution occurs near the vertical borehole, which results in under-utilization of the formation capacity. Another disadvantage is that non-solvent is pumped into the directional drilling and a preparation opening is formed near the casing bottom end of the directional drilling. Because there is no instrument available to monitor the non-solvent level in the directional borehole, there is no or unreliable level monitoring, it is not possible to maintain the desired non-solvent level near the directional (vertical/horizontal) borehole, which may result in dissolution of salt near the bottom end of the directional (vertical/horizontal) borehole casing, exposure of the salt formation roof (roof) and its possible collapse, and loss of subsurface reservoir tightness. Furthermore, this method can only be achieved if the top plate of the salt formation is strictly horizontal, since it is a precondition that the non-solvent-brine interface in the vertical borehole is kept at or above the level of the non-solvent-brine interface of the prepared opening or horizontal portion in the construction at the preparation stage, since the completion of the construction is marked by the non-solvent overflowing from the horizontal portion of the opening into the vertical borehole.
The closest prior art is a method of forming an underground tunnel reservoir in a rock salt formation of limited capacity, the method involving: vertical drilling and vertical/horizontal drilling, the latter extending horizontally near the bottom of the salt formation; installing a casing and a production string so that the bottom end of the string reaches the bottom of the salt formation; communicating the drill holes; dissolving salt by supplying water through a vertically/horizontally drilled production string; extracting brine through a vertically/horizontally drilled production string; and as dissolution proceeds, the injection point is moved to the opening (V.A. Mazurov "Underground Gas and Oil Reservoirs in Salt Rock Deposits". Moscow, nedra Publishing,1982, pp.129-132).
The disadvantage of this method is that the dissolution of salt along the length of the tunnel reservoir is not uniform because the salt is mostly dissolved near the vertical borehole and the dissolution period is long, so the salt formation is completely dissolved with exposure of the bottom end of the vertical borehole casing before the salt is sufficiently dissolved along the length of the reservoir. Furthermore, the method involves moving a vertically/horizontally drilled production string, which is challenging and can lead to string kinking.
Disclosure of Invention
The problem to be solved by the invention is to improve the efficiency of forming underground tunnel reservoirs in rock salt by controlling reservoir formation.
Compared with a prototype, the technical scheme of the invention has the following advantages:
controlling formation of a subterranean reservoir by injecting a non-solvent into a vertical borehole;
for a given salt formation thickness, forming a subterranean reservoir having a greater geometric volume and a higher capacity;
by controllably moving the water injection point to the formed opening, a reliable, continuous reservoir formation is ensured.
The essence of the invention is a method of forming an underground tunnel reservoir in a rock salt formation of limited thickness, the method comprising: drilling a vertical borehole and a vertical/horizontal borehole, the latter extending horizontally near the bottom of the salt formation; installing a casing and a production string in the borehole so that the bottom end of the production string reaches the bottom of the salt formation; communicating the vertical borehole with the vertical/horizontal borehole; extracting brine through a vertically drilled production string; and the water injection point is moved into the formed opening when the next stage of salt dissolution is performed.
According to the proposed method, a production string installed in a vertical borehole consists of two concentric outer and inner suspension columns, and a non-solvent is pumped into the annular space between the casing and the outer suspension column, creating a preparation opening large enough to communicate the vertical borehole with the vertical/horizontal borehole.
Two coaxial suspension columns (one pumping water and the other pumping brine) in a vertical bore may form a preparation opening.
Injecting a non-solvent into the vertical bore hole may control the rate of dissolution of the salt at the top of the preliminary opening and near the bore hole.
According to the proposed method, in order to periodically move the injection point into the formed opening, a packer (packer) is installed in the production string of a vertical/horizontal borehole, and then the string is perforated before the packer. The purpose of the packer is to prevent water from reaching the previous injection point and uncontrolled salt dissolution. Another advantage of maintaining the position of the production string is that it does not move relative to the opening, which may prevent any loss of stability (uncontrolled movement) during flooding.
Upon the next stage of dissolution, the non-solvent level within the vertical borehole is raised, thereby slowing down salt dissolution at the top of the preparation opening and avoiding salt formation exposure near the bottom end of the vertical borehole casing until formation of the subterranean reservoir is completed.
To increase the rate of injected water and brine extraction after borehole communication, the inner suspension column is removed from the vertical borehole and brine is recovered and extracted through the outer suspension column.
Drawings
The proposed method of forming a subterranean tunnel vault is shown in fig. 1 and 2.
FIG. 1 shows the reservoir formation process after a preliminary opening is formed around the vertical bore and the bores are in communication.
Fig. 2 shows the bank formation process after the final stage of opening formation.
Fig. 1 and 2 show a vertical borehole 1 and a vertical/horizontal borehole 2 and a rock salt formation 3 of limited thickness. The vertical borehole contains a casing 4 and a production string consisting of an outer suspension string 5 and an inner suspension string 6. A non-solvent 7 is located in the annular space between the casing 4 and the outer suspension column 5, the interface with the brine being at a liquid level 8. A preliminary opening 9 is formed at the bottom of the vertical drilling hole 1 so as to communicate the vertical drilling hole and the vertical/horizontal drilling hole. The vertical/horizontal borehole 2 is provided with a casing 10 and a production string 11. The bottom end of the string of vertical/horizontal bores 2 is mounted in position 12, corresponding to the water injection point before the first stage of opening formation. The packers 13, 14 and 15 installed in the second, third and fourth stages and their respective injection points 16, 17 and 18 are moved away from the vertical borehole 1. As a result, openings 19 are formed in the first stage, openings 20 are formed in the second stage, openings 21 are formed in the third stage, and a complete subterranean reservoir 22 is formed after the fourth stage.
Detailed Description
Embodiments of the present invention are as follows. First, a vertical borehole 1 is drilled. A casing 4 and two coaxial suspension columns, an outer suspension column 5 and an inner suspension column 6, are installed in the borehole 1. The outer suspension column 5 enters the depth above the bottom of the salt formation 3 and the inner suspension column 6 enters near the bottom of the salt formation 3. A non-solvent 7 is pumped into the borehole 1, maintaining the interface between the non-solvent and the brine at a liquid level 8 at the depth of the outer suspension column 5. Water is pumped through the outer suspension column 5 and brine is extracted through the inner suspension column 6, forming a preparation opening 9. The vertical/horizontal borehole 2 is then drilled until it communicates with the preparation opening 9. In the borehole 2 a casing 10 and a production string 11 are installed, the bottom end of which is located at a distance from the vertical borehole 1 at a location 12. The level of non-solvent in the vertical bore 1 increases. Water is pumped through the production string 11 and brine is extracted through the suspended columns 5 and 6 in the vertical borehole 1. In order to reduce hydraulic friction losses and increase the water supply rate, the inner suspension column 6 is removed from the vertical bore hole 1 before starting salt dissolution and brine is extracted through the outer suspension column 5. After extracting a certain amount of salt and forming the opening 19, the first stage is completed. Then, the packer 13 is installed in the production string 11 and the production string 11 is pierced, forming perforations 16. The level of non-solvent in the vertical bore 1 rises, water is pumped through the production string 11 and brine is extracted through the outer suspension string 5. After extracting a certain amount of salt and forming the opening 20, the second stage is completed. Packer 14 is then installed to form perforations 17, raise the non-solvent level, pump water and extract brine while removing a quantity of salt, thereby forming third stage openings 21. The fourth stage is similar, which results in the formation of a subterranean reservoir 22.
Exemplary embodiments.
In the construction process of the underground natural gas reservoir, the capacity of the salt stratum 3 is 350000m within the depth range of 1150-1200m 3 Is a subterranean reservoir 22. The vertical borehole 1 is drilled 1 meter deeper than the bottom of the salt formation. The casing 4 is installed to a depth of 1150m and the suspension columns 5, 6 are then lowered into the boreholes 1198, 1199.5m respectively. The non-solvent 7 was pumped to level 8, 1198m. Water is pumped through the suspension column 5 and brine is extracted through the suspension column 6, thereby maintaining the non-solvent 7 at a liquid level 8. The level of the non-solvent is monitored by a geophysical method using a wireline logging tool via the vertical borehole 1. The cylindrical preparation opening 9 of height 2m and radius 2m is flushed away. Thereafter, the vertical/horizontal borehole 2 is drilled to a horizontal position near the bottom of the salt formation 3 and communicated to the preparation opening 9. In vertical/horizontal drilling, the casing 10 and production tubing string 11 are installed to a depth 1150m. The bottom end of the column is located 60m from the vertical bore. The non-solvent level in the preparation opening 9 is maintained at 10m above the junction of the boreholes 1 and 2. Water at 250m 3 The flow rate of/h is pumped into the production tubing string 11. Through vertical drillingTo extract the brine produced. After 30000 tons of salt are extracted, the first stage is completed, forming openings 19. At 150m from the vertical borehole, a packer 13 is installed in the production string 11. The string 11 is then perforated before the packer so that the total area of perforations is twice the cross-sectional area of the string 11. This creates a new water injection point 16. The level of non-solvent in the preparation opening 9 is raised by 10m. Water at 250m 3 The flow rate of/h is pumped into the production tubing string 11. The produced brine is extracted through the suspended columns 5 and 6 in the vertical bore 1. After 70000 tons of salt are extracted, the second stage is completed and an opening 20 is formed. At 240m from the vertical borehole, the packer 14 is installed in the production string 11. The string 11 is then perforated prior to the packer, similar to the first step. This creates a new water injection point 17. The level of non-solvent in the preparation opening 9 is raised by 10m. Water at 250m 3 The flow rate of/h is pumped into the production tubing string 11. The brine produced is extracted through the suspended columns 5 and 6 in the vertical bore. After 200000 tons of salt are extracted, the third stage is completed, forming openings 21. At 300m from the vertical borehole, a packer 15 is installed in the string 11. The tubing string 11 is then perforated prior to the packer, similar to the first step. This creates a new water injection point 18. The level of non-solvent in the preparation opening 9 is raised by 15m. Water at 250m 3 The flow rate of/h is pumped into the production tubing string 11. The brine produced is extracted through the suspended columns 5 and 6 in the vertical bore. After 340000 tons of salt are extracted, the fourth stage is complete. This completes the formation of the subterranean reservoir 22.
Industrial applicability
The technology described herein has been implemented when building underground tunnel reservoirs in salt formations of russian underground gas storage facilities.
Claims (2)
1. A method of forming an underground tunnel reservoir in a rock salt formation of limited thickness, comprising: drilling a vertical borehole and a vertical/horizontal borehole extending horizontally near the bottom of the salt formation; installing a casing and a production string in the borehole, the bottom end of the production string being located near the bottom of the salt formation; communicating the drilled vertical borehole with the vertical/horizontal borehole; dissolving salt by supplying water through the vertically/horizontally drilled production string and extracting brine through the vertically drilled production string; and moving a water injection point into the formed opening as the next stage of salt dissolution is performed, characterized in that the production string of the vertical borehole is composed of an outer suspension column and an inner suspension column which are coaxial, a non-solvent is pumped into the annular space between the casing and the outer suspension column, a preparation opening is formed large enough to communicate the vertical borehole and the vertical/horizontal borehole, and the water injection point into the opening is moved by installing a packer into the production string of the vertical/horizontal borehole and then perforating the production string and raising the level of the non-solvent as the next stage of salt dissolution is performed.
2. The method of claim 1, wherein the inner suspension string is removed from the vertical borehole after the drilling of the vertical borehole and the vertical/horizontal borehole are in communication.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2021103987A RU2754232C1 (en) | 2021-02-17 | 2021-02-17 | Method for constructing an underground tunnel reservoir in a rock salt reservoir of limited capacity |
| RU2021103987 | 2021-02-17 | ||
| PCT/RU2022/000038 WO2022177464A1 (en) | 2021-02-17 | 2022-02-14 | Method of forming an underground reservoir in a stratum of rock salt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117178106A true CN117178106A (en) | 2023-12-05 |
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ID=77670002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280028876.XA Pending CN117178106A (en) | 2021-02-17 | 2022-02-14 | Method for forming underground reservoirs in rock salt formations |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN117178106A (en) |
| RU (1) | RU2754232C1 (en) |
| WO (1) | WO2022177464A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2861428A (en) * | 1953-12-28 | 1958-11-25 | Phillips Petroleum Co | Underground storage cavern having laterally spaced well and method therefor |
| SU140369A1 (en) * | 1961-03-21 | 1961-11-30 | М.Г. Головкин | Method of constructing underground tanks for petroleum, petroleum products and liquefied gases in rock salt formations |
| SU1820597A1 (en) * | 1990-11-29 | 1996-10-20 | Украинский научно-исследовательский институт природных газов | Method of building underground gas storages in low amplitude water bearing structures or water encroached gas bearing beds |
| RU2236579C1 (en) * | 2003-07-02 | 2004-09-20 | Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (Технический университет) | Method for creating underground reservoirs in rock-salt formations |
| RU2246437C1 (en) * | 2003-12-04 | 2005-02-20 | Государственное образовательное учреждение высшего профессионального образования Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет) | Method of building underground storage for gases in soluble deposits |
| RU2258652C1 (en) * | 2004-02-17 | 2005-08-20 | Общество с ограниченной ответственностью (ООО) "Подземгазпром" | Method for underground tunnel reservoir building in rock salt bed having limited thickness |
-
2021
- 2021-02-17 RU RU2021103987A patent/RU2754232C1/en active
-
2022
- 2022-02-14 CN CN202280028876.XA patent/CN117178106A/en active Pending
- 2022-02-14 WO PCT/RU2022/000038 patent/WO2022177464A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022177464A1 (en) | 2022-08-25 |
| RU2754232C1 (en) | 2021-08-30 |
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