CN106523029A - Transformation method for irregular salt cavern - Google Patents

Abstract

An embodiment of the present invention provides a method for reconstructing a deformed salt chamber, the method comprising: injecting compressed air into the deformed salt chamber through a casing; injecting fresh water into the bottom of the deformed salt chamber through a central tube; adjusting the pressure of the compressed air so that the pressure of the compressed air and the pressure of the fresh water reach hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the upper part of the air-water interface salt chamber and dissolve the air-water The salt rock on the upper side of the interface salt cavity; the fresh water dissolves the salt rock on the lower side of the gas-water interface of the deformed salt cavity, so that the radius of the deformed salt cavity on the lower side of the gas-water interface is enlarged. When the enlarged deformed salt chamber reaches the preset range, a modified salt chamber will be obtained. The method can save the high cost due to the use of oil pads, and is technically easier to implement, and finally transforms the deformed salt cavity into a high-value oil and gas reservoir.

Description

Reconstruction method of malformed salt cavity

technical field

The invention relates to the field of salt chambers, in particular to a method for transforming deformed salt chambers.

Background technique

At present, in order to solve the increasingly serious energy crisis, it is imperative to establish an energy strategic reserve, and the construction of an underground salt cavern reserve is the most important part of the energy strategic reserve. The underground salt cavern store is generally based on a single well oil pad The water-soluble mining method is used for construction, and the oil density is lower than water, and the characteristics of floating on the upper part to control the upper dissolution are used to help build the cavity; but when the process is not implemented properly, or the geological conditions are not clearly understood, it is easy to appear columnar with too small lateral size Malformed cavities, rendering the cavities unusable for energy storage. At this time, if the oil cushion mining method is still used to modify the dissolved cavity, it will not only consume a lot of oil and cost a lot, but also the technology is difficult to implement.

Contents of the invention

In view of this, the purpose of the embodiments of the present invention is to provide a method for reconstructing a deformed salt cavity to solve the above problems.

In the first aspect, an embodiment of the present invention provides a method for reconstructing a deformed salt chamber, the method comprising: injecting compressed air into the deformed salt chamber through a sleeve; injecting fresh water into the bottom of the deformed salt chamber through a central pipe; adjusting the Compress the pressure of the air so that the pressure of the compressed air and the pressure of the fresh water reach hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the upper part of the air-water interface salt chamber and dissolving The salt rock on the upper side of the gas-water interface salt cavity; the fresh water dissolves the salt rock on the lower side of the gas-water interface in the deformed salt cavity, so that the deformed salt cavity is on the lower side of the gas-water interface The radius is expanded, and when the enlarged deformed salt chamber reaches the preset range, a modified salt chamber is obtained.

Compared with the prior art, the embodiment of the present invention provides a method for reconstructing a deformed salt cavity, by using compressed air as an air cushion during the reconstruction of a deformed salt cavity, which can save the high cost caused by the use of an oil cushion, and is more technically It is easy to implement, and by adjusting the pressure of the compressed air, the pressure of the compressed air and the pressure of the fresh water are hydraulically balanced to form an air-water interface, and the air-water interface is used to prevent the fresh water from salting the air-water interface The upper part of the cavity flows and dissolves the salt rock on the upper side of the gas-water interface salt cavity, and finally transforms the deformed salt cavity into a preset salt cavity, that is, a high-value oil and gas reservoir.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a flow chart of a method for reconstructing a deformed salt cavity provided by the first embodiment of the present invention.

Fig. 2 is a schematic diagram of a method for reconstructing a deformed salt cavity according to the first embodiment of the present invention.

Fig. 3 is a flowchart of a method for reconstructing a deformed salt cavity according to the second embodiment of the present invention.

Fig. 4 is the first schematic diagram of the principle of a method for reconstructing a deformed salt cavity provided by the second embodiment of the present invention.

Fig. 5 is a second schematic diagram of the principle of a method for reconstructing a deformed salt cavity provided by the second embodiment of the present invention.

Fig. 6 is a third schematic diagram of the principle of a method for reconstructing a deformed salt cavity provided by the second embodiment of the present invention.

Fig. 7 is a flow chart of a method for reconstructing a deformed salt cavity according to the third embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

Fig. 1 shows a flow chart of a method for reconstructing a deformed salt cavity provided by the first embodiment of the present invention. Fig. 2 is a schematic diagram of a method for reconstructing a deformed salt cavity according to the first embodiment of the present invention.

Please refer to FIG. 2 , a method for reconstructing a deformed salt cavity provided in this embodiment uses a casing 100 and a central tube 300 during implementation. Wherein, the central pipe 300 is sleeved on the casing 100, and there is a gap between the casing 100 and the central pipe 300, that is, an annular part is formed, so that compressed air can be injected into the deformed salt chamber 400 through the annular part of the casing 100. . It can be understood that a valve may be provided at the opening of the casing, so that the compressed air can be injected into the malformed salt chamber 400 through the valve. The casing 100 is arranged at the opening of the deformed salt chamber 400 to form a closed space with the deformed salt chamber 400 . The fresh water is injected into the bottom of the deformed salt chamber 400 through the central pipe 300 . It can be understood that a valve can also be set at the opening of the central pipe 300 , so that the fresh water can be injected from the valve of the central pipe 300 and enter the bottom of the deformed salt chamber 400 .

Please refer to FIG. 1 . FIG. 1 shows a flow chart of a method for reconstructing a deformed salt cavity according to the first embodiment of the present invention. The methods include:

Step S101, inject compressed air into the deformed salt cavity through the casing;

Wherein, the compressed air can be provided on the ground surface with a mercury equipped with compressed air, and the compressed air can be injected into the cavity through the mercury equipped with compressed air.

Step S102, injecting fresh water into the bottom of the deformed salt cavity through the central pipe;

Step S103, adjusting the pressure of the compressed air so that the pressure of the compressed air and the pressure of the fresh water reach hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the air-water interface The upper part of the salt cavity flows and dissolves the salt rock on the upper side of the salt cavity at the air-water interface;

Wherein, the value of the pressure of the compressed air may be acquired through a ground air compressor, and then the pressure of the compressed air may be adjusted.

Step S104, the fresh water dissolves the salt rock of the deformed salt cavity located at the lower side of the gas-water interface, so that the radius of the deformed salt cavity at the lower side of the gas-water interface is enlarged. When the enlarged deformed salt cavity When the preset range is reached, a modified salt chamber is obtained.

The compressed air is injected into the deformed salt chamber 400 through the casing 100 , and the compressed air is in the upper part of the deformed salt chamber 400 because the compressed air is injected from the upper part of the deformed salt chamber 400 . The fresh water is injected into the bottom of the deformed salt chamber 400 through the central pipe 300 . Since the fresh water is injected from the bottom of the deformed salt chamber 400 , the fresh water is at the bottom of the deformed salt chamber 400 . Adjust the pressure of the compressed air so that the pressure of the compressed air and the pressure of the fresh water reach a hydraulic balance to form an air-water interface 600. At this time, the fresh water below the air-water interface 600 cannot flow upward due to pressure, so the Fresh water dissolves the salt rock of the deformed salt chamber 400 at the lower side of the air-water interface 600, so that the radius of the deformed salt chamber 400 at the lower side of the air-water interface 600 expands. When the enlarged deformed salt chamber 400 When the preset range is reached, a modified salt chamber is obtained.

The embodiment of the present invention provides a method for reconstructing a deformed salt cavity. By using compressed air as an air cushion during the reconstruction of a deformed salt cavity, the high cost caused by the use of an oil cushion can be saved, and it is technically easier to implement. The pressure of the air, so that the pressure of the compressed air and the pressure of the fresh water reach a hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the upper part of the air-water interface salt chamber and dissolve the The salt rock on the upper side of the salt cavern at the gas-water interface, and finally transform the deformed salt cavern into the preset salt cavern, that is, a high-value oil and gas reservoir.

Fig. 3 shows a flowchart of a method for reconstructing a deformed salt cavity according to the second embodiment of the present invention. Fig. 4 is the first schematic diagram of the principle of a method for reconstructing a deformed salt cavity provided by the second embodiment of the present invention. Fig. 5 is a second schematic diagram of the principle of a method for reconstructing a deformed salt cavity provided by the second embodiment of the present invention. Fig. 6 is a third schematic diagram of the principle of a method for reconstructing a deformed salt cavity provided by the second embodiment of the present invention.

As shown in FIG. 4 to FIG. 6 , a casing 100 , an intermediate tube 200 , and a central tube 300 are used in implementing a deformed salt cavity reconstruction method provided in this embodiment. Wherein, the openings of the casing 100 , the intermediate pipe 200 and the central pipe 300 can all be provided with valves. The central pipe 300 is sleeved on the central pipe 200, and there is a gap between the central pipe 300 and the central pipe 200, that is, an annular part is formed, so that the brine can be discharged to the surface through the annular part formed by the central pipe 300 and the central pipe 200, The intermediate pipe 200 is sleeved on the casing 100 , and there is a gap between the casing 100 and the intermediate pipe 200 , that is, an annular part is also formed, so that compressed air can be injected into the deformed salt chamber 400 through the annular part of the casing. The casing 100 is arranged at the opening of the deformed salt chamber 400 to form a closed space with the deformed salt chamber 400 .

Please refer to FIG. 3 . FIG. 3 shows a flowchart of a method for reconstructing a deformed salt cavity according to the second embodiment of the present invention. The methods include:

Step S201, injecting compressed air into the deformed salt cavity through the casing;

Step S202, inject fresh water into the bottom of the deformed salt cavity through the central pipe;

Step S203, adjusting the pressure of the compressed air so that the pressure of the compressed air and the pressure of the fresh water reach hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the air-water interface The upper part of the salt cavity flows and dissolves the salt rock on the upper side of the salt cavity at the air-water interface;

Step S204, the fresh water dissolves the salt rock in the lower side of the air-water interface in the deformed salt chamber to form brine, and the brine is discharged to the surface through the annular space formed by the central pipe and the middle pipe, and the brine is transported to the brine factory;

Step S205, adjusting the pressure of the compressed air again to increase the height of the air-water interface;

Step S206, lifting the intermediate pipe towards the ground, so that the injected fresh water dissolves the salt rock on the upper side of the deformed salt cavity;

Step S207, when the enlarged deformed salt chamber reaches the preset range, obtain the reconstructed salt chamber.

Wherein, it can be judged whether the deformed salt cavity reaches the preset range by collecting the amount of the discharged brine on the ground. It can be understood that how much water is injected will dissolve how much salt, and by collecting the amount of discharged brine on the ground and monitoring the data, it can be judged whether the deformed salt cavity reaches the preset range. It can be understood that, there are many implementation manners for judging whether the deformed salt cavity reaches the preset range, and are not limited to the implementation manners.

Please refer to FIG. 4 , firstly, the compressed air is injected into the deformed salt chamber 400 through the casing 100 . At this time, the compressed air is in the upper part of the deformed salt chamber 400 because the compressed air is injected from the upper part of the deformed salt chamber 400 . The fresh water is injected into the bottom of the deformed salt chamber 400 through the central pipe 300 . Since the fresh water is injected from the bottom of the deformed salt chamber 400 , the fresh water is at the bottom of the deformed salt chamber 400 . Adjust the pressure of the compressed air so that the pressure of the compressed air and the pressure of the fresh water reach a hydraulic balance to form an air-water interface 600. At this time, the fresh water below the air-water interface 600 cannot flow upward due to pressure, so the The fresh water dissolves the salt rock on the side of the lower part of the gas-water interface in the deformed salt cavity. After the salt rock dissolves, brine is formed. Since the injected fresh water will generate hydrostatic pressure from the entrance to the bottom of the cavity, additional pressure can also be applied at the entrance of the cavity. At this time, the brine passes through the ring formed by the central pipe and the intermediate pipe 200 The empty portion is drained to the surface and the brine is transported to a brine plant. By collecting the amount of brine discharged on the ground, it is judged whether the deformed salt cavity reaches a preset range. When the enlarged deformed salt chamber 400 reaches the preset range, the pressure of the compressed air is adjusted again so that the height of the air-water interface 600 rises to form a new air-water interface 600 . And at the same time, the intermediate pipe is lifted toward the ground, so that the injected fresh water dissolves the salt rock on the upper side of the deformed salt cavity.

Please refer to FIG. 5 . FIG. 5 shows a schematic diagram after the height of the air-water interface 600 is raised by adjusting the pressure of the rising compressed air. At this time, the salt rock between the deformed salt cavern 400 and the air-water interface 600 in Fig. 3 has been dissolved and formed brine, and when fresh water enters again, the salt rock between the deformed salt cavern 400 and the air-water interface in Fig. 3 will not be dissolved again 600, at this moment, fresh water begins to dissolve the salt rock between the gas-water contact 600 in FIG. 4 and the new gas-water contact 600 in FIG. 5 . Please refer to FIG. 6 . FIG. 6 shows a schematic diagram of the modified cavity. By adjusting the pressure of the compressed air several times, the height of the air-water interface 600 is continuously raised, and the purpose of gradually dissolving the lateral salt rock is achieved. And finally form the modified cavity 500 .

The embodiment of the present invention provides a method for reconstructing a deformed salt cavity. By using compressed air as an air cushion during the reconstruction of a deformed salt cavity, the high cost caused by the use of an oil cushion can be saved, and it is technically easier to implement. The pressure of the air, so that the pressure of the compressed air and the pressure of the fresh water reach a hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the upper part of the air-water interface salt chamber and dissolve the The salt rock on the upper side of the salt cavern at the gas-water interface, and finally transform the deformed salt cavern into the preset salt cavern, that is, a high-value oil and gas reservoir. Moreover, at the same time, the produced brine is transported to the factory, which will also generate additional economic benefits.

Fig. 7 shows a flow chart of a deformed salt cavity reconstruction method provided by the third embodiment of the present invention, please refer to Fig. 7, the method includes:

Step S301, performing sonar cavity measurement on the deformed salt cavity to obtain the overall shape characteristics of the deformed salt cavity.

It can be understood that before the reconstruction of the deformed salt cavity, preparatory work can be carried out first, and the overall shape characteristics of the deformed salt cavity can be collected to provide complete information for the next cavity reconstruction, so that the reconstruction of the deformed salt cavity can be more accurate.

Wherein, the overall shape features include the three-dimensional shape of the deformed salt cavity, the corresponding size and depth of each part.

Step S302, inject compressed air into the inside of the deformed salt cavity through the casing;

Step S303, inject fresh water into the bottom of the deformed salt cavity through the central pipe;

Step S304, adjusting the pressure of the compressed air so that the pressure of the compressed air and the pressure of the fresh water reach hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the air-water interface The upper part of the salt cavity flows and dissolves the salt rock on the upper side of the salt cavity at the air-water interface;

Step S305, the fresh water dissolves the salt rock at the lower side of the air-water interface in the deformed salt chamber to form brine, the brine is discharged to the surface through the annular space formed by the central pipe and the intermediate pipe, and the brine is transported to the brine factory;

Step S306, adjusting the pressure of the compressed air again to increase the height of the air-water interface;

Step S307, lifting the intermediate pipe towards the ground, so that the injected fresh water dissolves the salt rock on the upper side of the deformed salt cavity;

Step S308, when the enlarged deformed salt cavity reaches the preset range, obtain the modified salt cavity;

Step S309, performing sonar cavity measurement on the modified cavity shape, and judging whether the modified cavity is a preset cavity.

It can be understood that after the shape of the modified cavity is formed, it can be judged again whether it is a preset cavity, to further confirm whether the modified cavity is usable, and further ensure the usability of the modified cavity.

The embodiment of the present invention provides a method for reconstructing a deformed salt cavity. By using compressed air as an air cushion during the reconstruction of a deformed salt cavity, the high cost caused by the use of an oil cushion can be saved, and it is technically easier to implement. The pressure of the air, so that the pressure of the compressed air and the pressure of the fresh water reach a hydraulic balance to form an air-water interface, and the air-water interface is used to prevent the fresh water from flowing to the upper part of the air-water interface salt chamber and dissolve the The salt rock on the upper side of the salt cavern at the gas-water interface, and finally transform the deformed salt cavern into the preset salt cavern, that is, a high-value oil and gas reservoir. At the same time, the produced brine is transported to the factory, which will also generate additional economic benefits. And before and after the transformation, the sonar cavity measurement is carried out separately, which improves the accuracy of the transformation cavity.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

In the several embodiments provided in this application, it should be understood that the disclosed method may also be implemented in other ways. The device embodiments described above are only illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functions and possible implementations of devices, methods and computer program products according to multiple embodiments of the present invention. operate. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified function or action , or may be implemented by a combination of dedicated hardware and computer instructions.

In addition, each functional module in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. . It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a kind of lopsided salt chamber remodeling method, it is characterised in that methods described includes：

Compressed air is injected into lopsided salt intracavity portion by sleeve pipe；

Fresh water is injected into the lopsided salt bottom of chamber portion by central canal；

The pressure of the compressed air is adjusted, so that the pressure of the compressed air reaches hydro-cushion with the pressure of the fresh water Gas-water interface is formed, the gas-water interface is used to prevent the fresh water to the gas-water interface salt chamber upper flow and dissolving institute State the rock salt of gas-water interface salt chamber upper side；

Described in the fresh water dissolution, lopsided salt chamber is located at the rock salt of the gas-water interface lower side, so that the lopsided salt chamber exists The increasing radius of the gas-water interface lower side, when the lopsided salt chamber after expansion reaches preset range, obtain improved Salt chamber.

2. method according to claim 1, it is characterised in that before the pressure of the compressed air is adjusted, the side Method also includes：

The pressure of the compressed air is obtained by ground air compressor.

3. method according to claim 1, it is characterised in that lopsided salt chamber is in air water circle described in the fresh water dissolution The rock salt of face lower side, including：

Described in the fresh water dissolution, lopsided salt chamber forms salt in the rock salt of the gas-water interface lower side, and the salt passes through Central canal discharges earth's surface with the annular section that intervalve is formed.

4. method according to claim 3, it is characterised in that the salt is passed through into central canal and centre is tubular described Into annular section discharge earth's surface after, methods described also includes：

By the brine transportation to salt factory.

5. method according to claim 1, it is characterised in that adjusting the amount and pressure of the compressed air, so that institute After the pressure of the pressure and the fresh water of stating compressed air reaches hydro-cushion formation gas-water interface, methods described also includes：

The pressure of the compressed air is adjusted again, so that the height of the gas-water interface rises.

6. method according to claim 5, it is characterised in that after the pressure for adjusting the compressed air again, institute Stating method also includes：

Intervalve is lifted toward ground direction, so that the rock salt of lopsided salt chamber upper side described in the fresh water dissolution of injection.

7. method according to claim 1, it is characterised in that compressed air is injected into inside cavity by sleeve pipe described Before, methods described also includes：

Sonar is carried out to the lopsided salt chamber and surveys chamber, obtain the Global shape feature in the lopsided salt chamber.

8. method according to claim 7, it is characterised in that the Global shape feature includes the three of the lopsided salt chamber Dimension form, the corresponding size in each position and depth.

9. method according to claim 1, it is characterised in that obtain improved cavity described, methods described is also wrapped Include：

Sonar is carried out to the improved cavity geometry and surveys chamber, judge whether the improved cavity is default cavity.

10. method according to claim 3, it is characterised in that reach default model in lopsided salt chamber after expanding When enclosing, before obtaining improved salt chamber, methods described also includes：

The amount of the salt by discharging in ground acquisition, judges whether the lopsided salt chamber reaches preset range.