Multi-stage salt cavity and salt cavern gas storage utilizing insoluble substance interlayer

Abstract

The utility model provides a multistage salt-cavity salt-cavern gas storage utilizing an insoluble substance interlayer, and belongs to the technical field of salt-cavity salt-cavern gas storage. The first tube well penetrates through the cover layer and then communicates with a first cavity in the first rock stratum, the second tube well sequentially penetrates through the cover layer, the first cavity and the first thick interlayer and then communicates with a second cavity, and the second cavity penetrates through the second rock stratum, the thin interlayer and the third rock stratum; the third tube well sequentially penetrates through the cover layer, the first cavity, the first thick interlayer, the second cavity and the second thick interlayer and then communicates with the third cavity located in the fourth rock stratum. According to the multi-stage salt cavity and salt cavern gas storage, the characteristics of the insoluble substance thick interlayers are utilized, the thick interlayers are reserved during water-soluble cavity making, salt layers adjacent to the interlayers are divided into independent cavities through the insoluble substance thick interlayers, the multiple cavities are combined in a grading mode through the tubular column, and the multi-stage salt cavity and salt cavern gas storage is formed.

Description

Technical Field

[0001] The utility model relates to the technical field of salt cavity and salt cavern gas storage, in particular to a multi-stage salt cavity and salt cavern gas storage using insoluble interlayers. Background Art

[0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art.

[0003] Salt cavern gas storage is a space cave formed by water dissolution in thicker underground salt layers or salt domes in a certain way, which is used to store gases including but not limited to natural gas, hydrogen, compressed air, etc.

[0004] At present, several salt cavern gas storage facilities have been built, including natural gas storage facilities and compressed air underground gas storage facilities in compressed air energy storage power stations. Due to the presence of insoluble interlayers in layered salt layers, when the salt cavern gas storage facilities are water-dissolved, the cavity will be difficult to dissolve and the cavity will shrink due to the different properties of the interlayers in different insoluble interlayers. The shape of the salt cavity is difficult to control and the volume of the salt cavity will also be limited. The more salt interlayers there are, the more insoluble matter there is in the salt layer. At present, the maximum insoluble matter content that can be accepted for the construction of salt caverns generally does not exceed 30%. This makes it impossible to build rock salt gas storage facilities in most layered rock salt deposits, which to a certain extent restricts the development of salt cavern gas storage facilities. Utility Model Content

[0005] In order to solve the shortcomings of the prior art, the utility model provides a multi-stage salt cavity salt cavern gas storage using insoluble interlayers. The characteristics of the thick insoluble interlayers are utilized to retain the thick interlayers during water-soluble cavity formation. The thick insoluble interlayers are utilized to divide the adjacent salt layers of the interlayers into separate cavities, and the multiple cavities are hierarchically combined using pipe columns to form a multi-stage salt cavity salt cavern gas storage.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a multi-stage salt cavity salt cavern gas storage using insoluble interlayers.

[0008] A multi-stage salt cavern gas storage using insoluble interlayers, comprising:

[0009] A cap layer, a first rock layer at the bottom of the cap layer, a first thick interlayer at the bottom of the first rock layer, a second rock layer at the bottom of the first thick interlayer, a thin interlayer at the bottom of the second rock layer, a third rock layer at the bottom of the thin interlayer, a second thick interlayer at the bottom of the third rock layer, and a fourth rock layer at the bottom of the second thick interlayer;

[0010] The first tube well passes through the cap layer and is connected to the first cavity in the first rock layer. The second tube well passes through the cap layer, the first cavity and the first thick interlayer in sequence and is connected to the second cavity. The second cavity passes through the second rock layer, the thin interlayer and the third rock layer.

[0011] The third pipe well passes through the cap layer, the first cavity, the first thick interlayer, the second cavity and the second thick interlayer in sequence and is connected with the third cavity located in the fourth rock layer.

[0012] As a further limitation of the first aspect of the present invention, the first cavity is formed by dissolution of a first tube well extending into the first rock formation.

[0013] As a further limitation of the first aspect of the utility model, the second cavity is formed by dissolution of a second tube well extending into the second rock formation, and the thin interlayer is dissolved during the dissolution so that the second cavity passes through the second rock formation, the thin interlayer and the third rock formation.

[0014] As a further limitation of the first aspect of the present invention, the third cavity is formed by dissolution of a third tube well extending into the fourth rock formation.

[0015] In a second aspect, the utility model provides a multi-stage salt cavity salt cavern gas storage using insoluble interlayers.

[0016] A multi-stage salt cavern gas storage using insoluble interlayers, comprising:

[0017] A cap layer, a first rock layer at the bottom of the cap layer, a first thick interlayer at the bottom of the first rock layer, a second rock layer at the bottom of the first thick interlayer, a thin interlayer at the bottom of the second rock layer, a third rock layer at the bottom of the thin interlayer, a second thick interlayer at the bottom of the third rock layer, and a fourth rock layer at the bottom of the second thick interlayer;

[0018] The first tube well passes through the cap layer and is connected to the first cavity in the first rock layer. The second tube well passes through the cap layer, the first rock layer and the first thick interlayer in sequence and is connected to the second cavity. The second cavity passes through the second rock layer, the thin interlayer and the third rock layer.

[0019] The third pipe well passes through the cap layer, the first rock layer, the first thick interlayer, the second rock layer, the thin interlayer, the third rock layer and the second thick interlayer in sequence and is connected with the third cavity located in the fourth rock layer.

[0020] As a further limitation of the second aspect of the present invention, the first cavity is formed by dissolution of a first tube well extending into the first rock formation.

[0021] As a further limitation of the second aspect of the present invention, the second cavity is formed by dissolution of a second tube well extending into the second rock formation, and the thin interlayer is dissolved during the dissolution so that the second cavity passes through the second rock formation, the thin interlayer and the third rock formation.

[0022] As a further limitation of the second aspect of the present invention, the third cavity is formed by dissolution of a third tube well extending into the fourth rock formation.

[0023] In a third aspect, the utility model provides a multi-stage salt cavity salt cavern gas storage using insoluble interlayers.

[0024] A multi-stage salt cavern gas storage using insoluble interlayers, comprising:

[0025] A cap layer, a first rock layer at the bottom of the cap layer, a first thick interlayer at the bottom of the first rock layer, a second rock layer at the bottom of the first thick interlayer, a thin interlayer at the bottom of the second rock layer, a third rock layer at the bottom of the thin interlayer, a second thick interlayer at the bottom of the third rock layer, and a fourth rock layer at the bottom of the second thick interlayer;

[0026] The fourth pipe well is used as a water injection pipe well, and is used for injecting water into the third cavity in the fourth rock layer, the second cavity penetrating the second rock layer, the thin interlayer and the third rock layer, and the first cavity in the first rock layer;

[0027] The fifth tube well is used as a brine drainage tube well, and is used for draining brine from the third cavity in the fourth rock layer, the second cavity running through the second rock layer, the thin interlayer and the third rock layer, and the first cavity in the first rock layer.

[0028] As a further limitation of the third aspect of the present invention, the first cavity is formed by dissolving a fourth tube well and a fifth tube well extending into the first rock formation.

[0029] As a further limitation of the third aspect of the utility model, the second cavity is formed by dissolution of the fourth tube well and the fifth tube well extending into the second rock formation, and the thin interlayer is dissolved during the dissolution so that the second cavity passes through the second rock formation, the thin interlayer and the third rock formation.

[0030] As a further limitation of the third aspect of the present invention, the third cavity is formed by dissolution of a fourth tube well and a fifth tube well extending into a fourth rock formation.

[0031] As a further limitation of the third aspect of the utility model, the fourth tube well and the fifth tube well first dissolve the third cavity. After the third cavity is dissolved, the fourth tube well and the fifth tube well are lifted to continue to dissolve the second cavity. After the second cavity is dissolved, the fourth tube well and the fifth tube well are lifted to continue to dissolve the first cavity.

[0032] Compared with the prior art, the beneficial effects of the utility model are:

[0033] 1. The utility model innovatively proposes a multi-stage salt cavity salt cavern gas storage using insoluble interlayers. The thick insoluble interlayers are used to retain the thick interlayers during water-soluble cavity formation, and the thick insoluble interlayers are used to divide the adjacent salt layers into separate cavities. The multiple cavities are combined in stages using pipe columns to form a multi-stage salt cavity salt cavern gas storage.

[0034] 2. In the construction of salt cavern gas storage, the utility model can construct a single multi-level salt cavern gas storage according to the characteristics of the rock formation and the gas volume requirements, or it can construct multiple multi-level salt caverns to form a multi-level salt cavity group to store gas, and build a multi-level salt cavity combined salt cavern gas storage.

[0035] 3. The utility model uses the fourth tube well and the fifth tube well, and can form cavities of different levels from bottom to top in sequence, which can effectively save costs. The fourth tube well is used for water injection, and the fifth tube well is used for brine drainage, which can effectively improve the dissolution efficiency.

[0036] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0038] Figure 1 A schematic diagram of a multi-stage salt cavern gas storage using an insoluble interlayer provided in Example 1 of the utility model;

[0039] Figure 2 A schematic diagram of a multi-stage salt cavern gas storage using an insoluble interlayer provided in Example 2 of the present utility model;

[0040] Figure 3 A schematic diagram of a multi-stage salt cavern gas storage using an insoluble interlayer provided in Example 3 of the present utility model;

[0041] Among them, 1. cap layer; 2. thin interlayer; 3-1. first thick interlayer; 3-2. second thick interlayer; 4-1. first rock layer; 4-2. second rock layer; 4-3. third rock layer; 4-4. fourth rock layer; 5. first cavity; 6. second cavity; 7. third cavity; 8. first tube well; 9. second tube well; 10. third tube well; 11. fourth tube well; 12. fifth tube well. DETAILED DESCRIPTION

[0042] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0044] In the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0045] Embodiment 1:

[0046] In this implementation, if Figure 1 As shown, a multi-stage salt cavern gas storage using insoluble interlayers is proposed, comprising:

[0047] Cap layer 1, a first rock layer 4-1 at the bottom of the cap layer 1, a first thick interlayer 3-1 at the bottom of the first rock layer 4-1, a second rock layer 4-2 at the bottom of the first thick interlayer 3-1, a thin interlayer 2 at the bottom of the second rock layer 4-2, a third rock layer 4-3 at the bottom of the thin interlayer 2, a second thick interlayer 3-2 at the bottom of the third rock layer 4-3, and a fourth rock layer 4-4 at the bottom of the second thick interlayer 3-2;

[0048] The first tube well 8 passes through the cap layer 1 and communicates with the first cavity 5 in the first rock layer 4-1. The second tube well 9 passes through the cap layer 1, the first rock layer 4-1 and the first thick interlayer 3-1 in sequence and communicates with the second cavity 6. The second cavity 6 passes through the second rock layer 4-2, the thin interlayer 2 and the third rock layer 4-3.

[0049] The third pipe shaft 10 passes through the cap layer 1, the first rock layer 4-1, the first thick interlayer 3-1, the second rock layer 4-2, the thin interlayer 2, the third rock layer 4-3 and the second thick interlayer 3-2 in sequence and is connected to the third cavity 7 located in the fourth rock layer 4-4.

[0050] In this implementation, the first cavity 5 is formed by dissolving a first tube well 8 extending into the first rock layer 4-1.

[0051] In this implementation, the second cavity 6 is formed by dissolving the second tube well 9 extending into the second rock layer 4-2. During the dissolution, the thin interlayer 2 is dissolved so that the second cavity 6 passes through the second rock layer 4-2, the thin interlayer 2 and the third rock layer 4-3.

[0052] In this implementation, the third cavity 7 is formed by dissolving a third tube well 10 extending into the fourth rock layer 4-4.

[0053] The specific implementation methods include:

[0054] (1) drilling a first tube well 8, and dissolving the first cavity 5 through the first tube well 8;

[0055] (2) After the first cavity 5 forms the designed salt cavity, a second pipe well 9 is drilled, and the second pipe well 9 passes through the first thick interlayer 3-1 to dissolve the second cavity 6, while processing the thin interlayer 2 that is easy to dissolve;

[0056] (3) After the second cavity 6 forms the designed salt cavity, a third tube well 10 is drilled, and the third tube well 10 passes through the second thick interlayer 3-2 to dissolve the third cavity 7;

[0057] (4) After the third cavity 7 forms the designed salt cavity, the multi-stage salt cavity dissolution is completed.

[0058] In this implementation, the cap layer 1 refers to the non-permeable stratum overlying the salt layer. The salt cavity to be obtained in this implementation is an underground cave formed in the rock salt structure by artificial dissolution, and the cavity group refers to a collection of multiple salt cavities within a certain range.

[0059] Embodiment 2:

[0060] like Figure 2 As shown, the present implementation provides a multi-stage salt cavern gas storage using an insoluble interlayer, comprising:

[0061] Cap layer 1, a first rock layer 4-1 at the bottom of the cap layer 1, a first thick interlayer 3-1 at the bottom of the first rock layer 4-1, a second rock layer 4-2 at the bottom of the first thick interlayer 3-1, a thin interlayer 2 at the bottom of the second rock layer 4-2, a third rock layer 4-3 at the bottom of the thin interlayer 2, a second thick interlayer 3-2 at the bottom of the third rock layer 4-3, and a fourth rock layer 4-4 at the bottom of the second thick interlayer 3-2;

[0062] The first tube well 8 passes through the cap layer 1 and communicates with the first cavity 5 in the first rock layer 4-1. The second tube well 9 passes through the cap layer 1, the first rock layer 4-1 and the first thick interlayer 3-1 in sequence and communicates with the second cavity 6. The second cavity 6 passes through the second rock layer 4-2, the thin interlayer 2 and the third rock layer 4-3.

[0063] The third pipe shaft 10 passes through the cap layer 1, the first rock layer 4-1, the first thick interlayer 3-1, the second rock layer 4-2, the thin interlayer 2, the third rock layer 4-3 and the second thick interlayer 3-2 in sequence and is connected to the third cavity 7 located in the fourth rock layer 4-4.

[0064] In this implementation, the first cavity 5 is formed by dissolving a first tube well 8 extending into the first rock layer 4-1.

[0065] In this implementation, the second cavity 6 is formed by dissolving the second tube well 9 extending into the second rock layer 4-2. During the dissolution, the thin interlayer 2 is dissolved so that the second cavity 6 passes through the second rock layer 4-2, the thin interlayer 2 and the third rock layer 4-3.

[0066] In this implementation, the third cavity 7 is formed by dissolving a third tube well 10 extending into the fourth rock layer 4-4.

[0067] Embodiment 3:

[0068] like Figure 3 As shown, the present implementation provides a multi-stage salt cavern gas storage using an insoluble interlayer, comprising:

[0069] Cap layer 1, a first rock layer 4-1 at the bottom of the cap layer 1, a first thick interlayer 3-1 at the bottom of the first rock layer 4-1, a second rock layer 4-2 at the bottom of the first thick interlayer 3-1, a thin interlayer 2 at the bottom of the second rock layer 4-2, a third rock layer 4-3 at the bottom of the thin interlayer 2, a second thick interlayer 3-2 at the bottom of the third rock layer 4-3, and a fourth rock layer 4-4 at the bottom of the second thick interlayer 3-2;

[0070] The fourth pipe well 11 is used as a water injection pipe well, and is used for injecting water into the third cavity 7 in the fourth rock layer 4-4, the second cavity 6 penetrating the second rock layer 4-2, the thin interlayer 2 and the third rock layer 4-3, and the first cavity 5 in the first rock layer 4-1;

[0071] The fifth tube well 12 is used as a brine drainage tube well, and is used to drain brine from the third cavity 7 in the fourth rock layer 4-4, the second cavity 6 penetrating the second rock layer 4-2, the thin interlayer 2 and the third rock layer 4-3, and the first cavity 5 in the first rock layer 4-1.

[0072] In this implementation, the first cavity 5 is formed by dissolving the fourth tube well 11 and the fifth tube well 12 extending into the first rock layer 4-1.

[0073] In this implementation, the second cavity 6 is formed by dissolving the fourth tube well 11 and the fifth tube well 12 extending into the second rock layer 4-2. During the dissolution, the thin interlayer 2 is dissolved so that the second cavity 6 passes through the second rock layer 4-2, the thin interlayer 2 and the third rock layer 4-3.

[0074] In this implementation, the third cavity 7 is formed by dissolving a fourth tube well 11 and a fifth tube well 12 extending into the fourth rock layer 4-4.

[0075] In this implementation, the fourth tube well 11 and the fifth tube well 12 first dissolve the third cavity 7. After the third cavity 7 is dissolved, the fourth tube well 11 and the fifth tube well 12 are lifted to continue to dissolve the second cavity 6. After the second cavity 6 is dissolved, the fourth tube well 11 and the fifth tube well 12 are lifted to continue to dissolve the first cavity 5.

[0076] The specific implementation methods include:

[0077] (1) The fourth tube well 11 and the fifth tube well 12 go down to the third cavity 7 at the bottom layer. The fourth tube well 11 is only used for water injection, and the fifth tube well 11 is only used for brine discharge, which dissolves the third cavity 7;

[0078] (1) After the third chamber 7 forms the designed salt chamber, the fourth tube well 11 and the fifth tube well 12 are lifted to the upper second chamber 6. The fourth tube well 11 is only used for water injection, and the fifth tube well 12 is only used for brine discharge, dissolving the second chamber 6 and processing the thin interlayer 2 that is easy to dissolve;

[0079] (3) After the second cavity 6 forms the designed salt cavity, the fourth tube well 11 and the fifth tube well 12 are lifted to the upper first cavity 5. The fourth tube well 11 is only used for water injection, and the fifth tube well 12 is only used for brine discharge to dissolve the first cavity 5;

[0080] (4) After the first cavity 5 forms the designed salt cavity, the multi-stage salt cavity dissolution is completed.

[0081] In some other implementations, in the construction of salt cavern gas storage, a single multi-level salt cavity salt cavern gas storage can be built according to the rock formation characteristics and gas volume requirements, or multiple multi-level salt cavities can be built to form a multi-level salt cavity group to store gas, and a multi-level salt cavity combined salt cavern gas storage can be built.

[0082] The utility model utilizes the thick interlayer of insoluble matter in the salt layer, which can solve the problem of the difficulty of dissolving the thick interlayer during water-soluble cavity formation, and can also avoid the shrinkage of the cavity at the interlayer to a certain extent, which is beneficial to the control of the salt cavity morphology and the increase of the salt cavity volume; because the utility model does not dissolve the thick interlayer of insoluble matter, when selecting the site for the salt cavern gas storage, a salt cavern gas storage can also be built for a salt mine with a thick interlayer, which breaks the site selection restrictions of the salt cavern gas storage to a certain extent.

[0083] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-stage salt cavern gas storage using insoluble interlayers, characterized in that: include: A cap layer, a first rock layer at the bottom of the cap layer, a first thick interlayer at the bottom of the first rock layer, a second rock layer at the bottom of the first thick interlayer, a thin interlayer at the bottom of the second rock layer, a third rock layer at the bottom of the thin interlayer, a second thick interlayer at the bottom of the third rock layer, and a fourth rock layer at the bottom of the second thick interlayer; The first tube well passes through the cap layer and is connected to the first cavity in the first rock layer. The second tube well passes through the cap layer, the first cavity and the first thick interlayer in sequence and is connected to the second cavity. The second cavity passes through the second rock layer, the thin interlayer and the third rock layer. The third pipe well passes through the cap layer, the first cavity, the first thick interlayer, the second cavity and the second thick interlayer in sequence and is connected with the third cavity located in the fourth rock layer.

2. A multi-stage salt cavern gas storage using insoluble interlayers, characterized in that: include: A cap layer, a first rock layer at the bottom of the cap layer, a first thick interlayer at the bottom of the first rock layer, a second rock layer at the bottom of the first thick interlayer, a thin interlayer at the bottom of the second rock layer, a third rock layer at the bottom of the thin interlayer, a second thick interlayer at the bottom of the third rock layer, and a fourth rock layer at the bottom of the second thick interlayer; The first tube well passes through the cap layer and is connected to the first cavity in the first rock layer. The second tube well passes through the cap layer, the first rock layer and the first thick interlayer in sequence and is connected to the second cavity. The second cavity passes through the second rock layer, the thin interlayer and the third rock layer. The third pipe well passes through the cap layer, the first rock layer, the first thick interlayer, the second rock layer, the thin interlayer, the third rock layer and the second thick interlayer in sequence and is connected with the third cavity located in the fourth rock layer.

3. The multi-stage salt cavern gas storage using insoluble interlayers as claimed in claim 1 or 2, characterized in that: The first cavity is formed by dissolution of a first tube well extending into the first rock formation.

4. The multi-stage salt cavern gas storage using insoluble interlayers as claimed in claim 1 or 2, characterized in that: The second cavity is formed by dissolution of a second tube well extending into the second rock formation, and the thin interlayer is dissolved during the dissolution so that the second cavity penetrates the second rock formation, the thin interlayer and the third rock formation.

5. The multi-stage salt cavern gas storage using insoluble interlayers as claimed in claim 1 or 2, characterized in that: The third cavity is formed by dissolution of a third tube well extending into the fourth rock formation.

6. A multi-stage salt cavern gas storage using insoluble interlayers, characterized in that: include: A cap layer, a first rock layer at the bottom of the cap layer, a first thick interlayer at the bottom of the first rock layer, a second rock layer at the bottom of the first thick interlayer, a thin interlayer at the bottom of the second rock layer, a third rock layer at the bottom of the thin interlayer, a second thick interlayer at the bottom of the third rock layer, and a fourth rock layer at the bottom of the second thick interlayer; The fourth pipe well is used as a water injection pipe well, and is used for injecting water into the third cavity in the fourth rock layer, the second cavity penetrating the second rock layer, the thin interlayer and the third rock layer, and the first cavity in the first rock layer; The fifth tube well is used as a brine drainage tube well, and is used for draining brine from the third cavity in the fourth rock layer, the second cavity running through the second rock layer, the thin interlayer and the third rock layer, and the first cavity in the first rock layer.

7. The multi-stage salt cavern gas storage using insoluble interlayers as claimed in claim 6 is characterized in that: The first cavity is formed by dissolution of a fourth tube well and a fifth tube well extending into the first rock formation.

8. The multi-stage salt cavern gas storage using insoluble interlayers as claimed in claim 6 is characterized in that: The second cavity is formed by dissolution of the fourth tube well and the fifth tube well extending into the second rock layer. During the dissolution, the thin interlayer is dissolved so that the second cavity penetrates the second rock layer, the thin interlayer and the third rock layer.

9. The multi-stage salt cavern gas storage using insoluble interlayers as claimed in claim 6, characterized in that: The third cavity is formed by dissolution of a fourth tube well and a fifth tube well extending into the fourth rock formation.

10. The multi-stage salt cavern gas storage using insoluble interlayers as claimed in claim 6, characterized in that: The fourth tube well and the fifth tube well first dissolve the third cavity. After the third cavity is dissolved, the fourth tube well and the fifth tube well are lifted to continue to dissolve the second cavity. After the second cavity is dissolved, the fourth tube well and the fifth tube well are lifted to continue to dissolve the first cavity.

Images