A method for constructing ultra-deep stratum sediment storage

Abstract

The present application discloses a method for constructing a sediment-type reservoir in ultra-deep formations, which relates to the field of salt rock cavity making. The target liquid is injected into the target salt well injection well, so that the injection well and the brine drainage well are filled with the saturated brine; high-pressure gas is injected into the injection well, so that the brine drainage well discharges the target volume of saturated brine; the injection of the high-pressure gas is stopped and the wellhead of the injection well is opened, so that the high-pressure gas is released into the atmosphere; the wellhead of the brine drainage well is opened to allow the atmosphere to enter the brine drainage well so that the gas-liquid interface reaches the target level, so that the roof collapses to form the sediment-type reservoir. The present application proposes a method for constructing a sediment-type reservoir in ultra-deep formations, which adopts the method of artificially releasing the roof of the dissolution cavity, reduces the internal pressure of the cavity, utilizes the huge ground stress, promotes the collapse of the interlayer, fills the dissolution cavity, and forms a sediment-type reservoir, and then utilizes the effect of the sediment on the cavity wall to maintain the stability of the cavity.

Description

Technical Field

[0001] The present specification relates to the technical field of salt rock cavity making, and more specifically, the present application relates to a method for constructing a sediment-type reservoir in an ultra-deep formation. Background Art

[0002] Since salt rock has extremely low permeability and good creep and damage recovery properties, salt caverns are highly secure as underground energy storage depots and are known as highly strategically secure reserves.

[0003] For ultra-deep salt rock, if the commonly used salt cavern net space utilization mode (Jintan mode) is adopted, the underground dissolution cavity requires a higher air pressure to match it to ensure the stability of the cavity. However, at present, the compressed air energy storage ground equipment is difficult to reach this pressure range, resulting in the inability to effectively utilize the deep salt rock. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In the first aspect, the present application proposes a method for constructing an ultra-deep stratum sediment reservoir, the method comprising:

[0006] Injecting target liquid into the target salt well injection well so that the injection well and the brine drainage well are filled with the saturated brine;

[0007] Injecting high-pressure gas into the injection well to cause the brine discharge well to discharge a target volume of saturated brine;

[0008] Stop injecting the high-pressure gas and open the wellhead of the injection well to release the high-pressure gas into the atmosphere;

[0009] The wellhead of the brine drainage well is opened to allow atmospheric air to enter the brine drainage well so that the gas-liquid interface reaches a target level, thereby causing the top plate to collapse and form the sludge-type reservoir.

[0010] In one embodiment, the above method further comprises:

[0011] During the roof collapse, the injection well and the brine drainage well are controlled to have different closing states;

[0012] Obtain dynamic data of the target salt well to monitor the progress of the above-mentioned roof collapse.

[0013] In one embodiment, the dynamic data include the gas pressure of the brine drainage well and the wellbore sound of the injection well.

[0014] In one embodiment, the target liquid includes the saturated brine.

[0015] In one embodiment, the target salt well is a salt well with an open surface and a recovery rate higher than 80%.

[0016] In one embodiment, the height of the casing shoe of the injection well is higher than the height of the casing shoe of the brine drainage well.

[0017] In one embodiment, the above method further comprises:

[0018] During the process of injecting high-pressure gas into the injection well, a preset number of gas injection stop operations are performed to calibrate the air column pressure difference.

[0019] In one embodiment, the checking of the air column pressure difference comprises:

[0020] The above air column pressure difference is verified by the following formula:

[0021]

[0022] P 气 +ΔP 气 =P 卤 +ρ 饱 gh

[0023] Where P 气 is the gas pressure at the injection wellhead, ΔP 气 is the pressure of the gas column injected into the well, P 卤 is the pressure at the brine drainage wellhead, ρ 饱 is the density of saturated brine, h is the height difference between the injection well and the drainage well, V is the volume of brine discharged from the drainage well, r is the inner diameter of the casing, and g is the acceleration due to gravity.

[0024] In one embodiment, the above method further comprises:

[0025] In the process of stopping the injection of the high-pressure gas and opening the wellhead of the injection well, obtaining the rate of change of the wellhead pressure of the injection well;

[0026] Whether the saturated brine enters the injection well is determined based on the wellhead pressure change rate.

[0027] In one embodiment, the above method further comprises:

[0028] Perform well cleaning operations on the above-mentioned injection well and the above-mentioned brine drainage well.

[0029] In summary, the method for constructing an ultra-deep formation sediment-type reservoir in the embodiment of the present application includes: injecting a target liquid into a target salt well injection well so that the injection well and the brine drainage well are filled with the saturated brine; injecting high-pressure gas into the injection well so that the brine drainage well discharges a target volume of saturated brine; stopping the injection of the high-pressure gas and opening the wellhead of the injection well so that the high-pressure gas is released into the atmosphere; opening the wellhead of the brine drainage well so that the atmosphere enters the brine drainage well so that the gas-liquid interface reaches a target level, so that the roof collapses to form the sediment-type reservoir. The present application proposes a method for constructing an ultra-deep formation sediment-type reservoir, which adopts a method of artificially releasing the roof of a dissolution cavity, reduces the internal pressure of the cavity, utilizes the huge ground stress, promotes the collapse of the interlayer, fills the dissolution cavity, and forms a sediment-type reservoir, and then utilizes the effect of the sediment on the cavity wall to maintain the stability of the cavity.

[0030] The method for constructing an ultra-deep formation sediment-type reservoir proposed in this application, and other advantages, objectives and features of this application will be partially reflected through the following description, and will also be partially understood by technical personnel in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 A schematic diagram of a process for constructing an ultra-deep stratum sediment reservoir provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the principle of gas injection and brine removal operation provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the principle of a gas release and halogen recovery operation provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the principle of artificial roof release and pressure relief operation provided in an embodiment of the present application;

[0036] Figure 2-Figure 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0037] 1-overburden, 2-interlayer, 3-salt rock, 4-production casing, 5-gas injection pipe, 6-injection well, 7-brine drainage well, 8-gas pipeline, 9-brine pipeline, 10-pressure gauge, 11-flow meter, 12-compressor, 13-gas flow direction, 14-brine flow direction, 15-packer, 16-high-pressure air, 17-saturated brine, 18-gravel. DETAILED DESCRIPTION

[0038] The present application proposes a method for constructing a sediment-type reservoir in an ultra-deep formation, which adopts a method of artificially releasing the top of a dissolution cavity, reduces the internal pressure of the cavity, utilizes the huge ground stress, causes the interlayer to collapse, fills the dissolution cavity, and forms a sediment-type reservoir, and then utilizes the effect of the sediment on the cavity wall to maintain the stability of the cavity.

[0039] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] Since salt rock has extremely low permeability and good creep and damage recovery characteristics, salt caverns are highly secure as underground energy storage depots and are known as highly strategically secure reserves. According to the type of underground space in salt mines, there are three main utilization modes of underground space in salt mines. (1) Salt cavern net space utilization mode (Jintan mode). Utilizing the net space of pure salt caverns after solution mining is also the main mode of salt cavern utilization in the world at this stage. In my country, the Jintan gas storage is a typical case. (2) Sediment void utilization mode (Tai'an mode). When the proportion of interlayers in the stratum is high and most of the space in the salt cavern cavity is filled with sediment, the sediment voids can be used to store gas. (3) Salt cavern-sediment mixed utilization mode (Jingshen mode). There are interlayers in the stratum, and after the interlayers collapse, part of the space is filled. The usable space includes salt caverns and sediment space, which belongs to the mixed utilization mode. The cavity of Jingshen Salt Industry in Huai'an, Jiangsu belongs to this utilization mode.

[0041] For ultra-deep salt rock, if the commonly used salt cavern net space utilization mode (Jintan mode) is adopted, the underground dissolution cavity requires a higher air pressure to match it to ensure the stability of the cavity. However, at present, the compressed air energy storage ground equipment is difficult to reach this pressure range, resulting in the inability to effectively utilize the deep salt rock.

[0042] See also Figure 1 , which is a schematic flow chart of a method for constructing an ultra-deep formation sediment reservoir provided in an embodiment of the present application, which may specifically include:

[0043] S110, injecting a target liquid into a target salt well injection well, so that the injection well and the brine drainage well are filled with the saturated brine;

[0044] Exemplarily, the target salt well includes at least one injection well and one brine drainage well. In the normal salt mining process, fresh water is injected into the injection well, and the saturated brine in the salt well is discharged through the brine drainage well under the pressure of the injected fresh water.

[0045] In the preparation stage of forming a sludge type reservoir, a target liquid is injected into the injection well. The target liquid includes saturated brine or other liquids. By injecting the target liquid, the injection well and the brine discharge well are filled with saturated brine.

[0046] S120, injecting high-pressure gas into the injection well to cause the brine discharge well to discharge a target volume of saturated brine;

[0047] For example, Figure 2 The figure is a schematic diagram of the principle of gas injection and brine removal operation provided in the embodiment of the present application. The gas injection and brine removal operation is performed using a ground air compressor 12, high-pressure air 16 is injected through the gas injection pipe 5 in the injection well 6, and saturated brine 17 is discharged through the brine removal well 7, providing a precondition for lowering the brine liquid level.

[0048] S130, stopping the injection of the high-pressure gas and opening the wellhead of the injection well to release the high-pressure gas into the atmosphere;

[0049] For example, Figure 3 The diagram is a schematic diagram of the principle of the degassing and brine recovery operation provided in the embodiment of the present application. Stop injecting high-pressure gas, and release high-pressure air 16 from the injection well 6 into the atmosphere, reduce the air pressure of the injection well S140, open the wellhead of the brine discharge well to allow the atmosphere to enter the brine discharge well so that the gas-liquid interface reaches the target level, so that the roof collapses to form the sediment-type reservoir.

[0050] Exemplarily, at the same time, the wellhead of the brine drainage well 7 is opened to allow the atmosphere to enter the brine drainage well. As the pressure of the injection well 6 decreases, the brine liquid level in the brine drainage well 7 will gradually decrease, and eventually the gas-liquid interface will reach the target level.

[0051] like Figure 4 The figure is a schematic diagram of the principle of artificial roof decompression operation provided by the embodiment of the present application. Through the degassing and brine recovery operation, the pressure inside the cavity is reduced, causing the cavity roof to collapse under the action of deep ground stress, and the interlayer fills the dissolution cavity, thereby forming a sediment type reservoir.

[0052] In summary, the present application proposes a method for constructing a sediment-type reservoir in an ultra-deep formation, which adopts the method of artificially releasing the top of the dissolution cavity, reduces the internal pressure of the cavity, utilizes the huge ground stress, promotes the collapse of the interlayer, fills the dissolution cavity, and forms a sediment-type reservoir, and then utilizes the effect of the sediment on the cavity wall to maintain the stability of the cavity.

[0053] In one embodiment, the above method further comprises:

[0054] During the roof collapse, controlling the injection well and the brine drainage well to have different closing states;

[0055] Dynamic data of the target salt well is obtained to monitor the progress of the roof collapse.

[0056] For example, the roof collapse is achieved by relying on strong ground stress. In this process, the underground conditions are mainly monitored. In order to monitor the underground conditions more, one well (such as brine drainage well 7) is closed and one well (such as injection well 6) is opened to maintain the difference between the two wells.

[0057] In one embodiment, the dynamic data includes the gas pressure of the brine drainage well and the wellbore sound of the injection well.

[0058] Exemplarily, the dynamic data includes monitoring of the gas pressure conditions on the brine drainage well 7 side and the wellbore sound conditions on the injection well 6 side.

[0059] In one embodiment, the target liquid includes the saturated brine.

[0060] For example, in the salt mining process, one well injects fresh water and one well discharges saturated brine. The inconsistent brine concentrations in the two wells are not conducive to data analysis. To facilitate data analysis, saturated brine is injected into the injection well side so that both wells are saturated with brine.

[0061] In one embodiment, the target salt well is a salt well with an open surface and a recovery rate higher than 80%.

[0062] For example, choosing a relatively open salt well on the surface can reduce the impact on the surrounding environment and provide enough space for operations. This can avoid conflicts with man-made facilities such as buildings, roads, and rivers, and reduce safety risks during operations. Choosing a salt well with a recovery rate of more than 80% can ensure that the cavity roof has enough space for collapse and can be smoothly released.

[0063] In one embodiment, the height of the casing shoe of the injection well is higher than the height of the casing shoe of the brine drainage well.

[0064] For example, the injection wells are selected with relatively high casing shoe positions, and the brine drainage wells are selected with relatively low casing shoe positions, so as to prevent the gas from overflowing prematurely.

[0065] In one embodiment, the above method further comprises:

[0066] During the process of injecting high-pressure gas into the injection well, a preset number of gas injection stop operations are performed to calibrate the air column pressure difference.

[0067] For example, the pressure of the air column during the gas injection process is the same as that of the brine column and cannot be ignored. However, as the gas injection progresses, the density of the air changes all the time. Therefore, it is necessary to calibrate the pressure of the air column. During the wellbore stage of gas injection and brine removal, 3-5 intermediate stops are set to calibrate the pressure difference of the air column.

[0068] In one embodiment, the checking of the air column pressure difference comprises:

[0069] The air column pressure difference is checked by the following formula:

[0070]

[0071] P 气 +ΔP 气 =P 卤 +ρ 饱 gh

[0072] Where P 气 is the gas pressure at the injection wellhead; ΔP 气 is the pressure of the gas column in the injection well; P 卤 is the pressure at the brine drainage wellhead; ρ 饱 is the density of saturated brine; h is the height difference between the injection well and the brine discharge well, V is the volume of brine discharged from the brine discharge well, r is the inner diameter of the casing, and g is the acceleration due to gravity.

[0073] For example, the liquid level difference h between the two wells can be accurately calculated based on the brine discharge volume V measured by the flow meter at the wellhead of the brine discharge well:

[0074]

[0075] Where: r is the inner diameter of the technical casing (production casing).

[0076] According to the pressure balance, we can get:

[0077] P 气 +ΔP 气 =P 卤 +ρ饱 gh

[0078] Where: P 气 Refers to the gas pressure at the injection wellhead, ΔP 气 It refers to the pressure of the gas column injected into the well, P 卤 It refers to the pressure at the wellhead of the brine drainage well, ρ 饱 It refers to the density of saturated brine, and h refers to the height difference of liquid levels in two wells.

[0079] In this way, the pressure difference of the air column at different pressures and heights can be quickly obtained, providing measured data for the subsequent calculation of the air column pressure difference.

[0080] In one embodiment, the above method further comprises:

[0081] In the process of stopping the injection of the high-pressure gas and opening the wellhead of the injection well, obtaining the rate of change of the wellhead pressure of the injection well;

[0082] Whether the saturated brine enters the injection well is determined based on the wellhead pressure change rate.

[0083] Exemplarily, the process of releasing gas and returning brine mainly monitors the position of the gas-liquid interface and the wellhead pressure of the injection well 6. And according to the pressure change rate of the injection well 6, it is judged whether the saturated brine 17 enters the injection well.

[0084] In one embodiment, the above method further comprises:

[0085] Perform well cleaning operations on the injection well and the brine drainage well.

[0086] For example, in order to ensure that there is no blockage inside the wellbore and to ensure that the subsequent gas injection and brine removal process proceeds smoothly, it is necessary to carry out well clearance operations, and to check the cementing conditions of the wells and the depth conditions of the two wells.

[0087] In one embodiment, the method for constructing an ultra-deep formation sediment reservoir can be achieved by preliminary preparation operations, gas injection and brine removal operations, gas release and brine recovery operations, and artificial roof caving and pressure relief operations, specifically including:

[0088] 1. Preliminary preparation operations:

[0089] 1.1. Well selection: Select a salt well with a relatively open surface and a recovery rate of more than 80% to ensure that there is enough space for the roof to collapse and the roof can be released smoothly.

[0090] 1.2. Well cleaning: Ensure that there is no blockage inside the wellbore to ensure the smooth progress of the subsequent gas injection and brine removal process. Check the cementing conditions of the well and the depth of the two wells.

[0091] 1.3. Fluid exchange: During the salt mining process, one well injects fresh water and the other well discharges saturated brine. The inconsistent brine concentrations in the two wells are not conducive to data analysis. To facilitate data analysis, saturated brine is injected into the injection well side so that both wells are filled with saturated brine.

[0092] 2. To perform gas injection and brine removal operations, please refer to Figure 2 , use the ground air compressor 12 to carry out gas injection and brine removal operations, high-pressure air 16 is injected through the gas injection pipe 5 in the injection well 6, and saturated brine 17 is discharged through the brine discharge well 7, providing the precondition for lowering the brine level.

[0093] The injection wells are selected with relatively high casing shoes, and the brine drainage wells are selected with relatively low casing shoes to prevent premature gas overflow. The gas injection pipes are selected with high strength and the lower end is installed with a packer 15 to withstand the high-pressure gas pressure and prevent the high-pressure gas from overflowing. A pressure gauge 10 is placed at the wellhead to record the wellhead pressure, including the gas pressure at the wellhead of the injection well and the liquid pressure at the wellhead of the brine drainage well; a flow meter 11 is installed on the brine drainage pipeline to record the total amount of brine discharged. If possible, a flow meter can also be added to record the amount of injected air.

[0094] The gas injection and brine removal can be divided into the following stages: 1) Wellbore stage: In this stage, air is injected into the wellbore, the saturated brine level in the wellbore drops rapidly, and the compressor pressure changes rapidly and continues to rise. For every 1m drop in the saturated brine level, the pressure changes by 2) Salt cavern stage: During this stage, high-pressure air enters the salt cavern.

[0095] The pressure of the air column during the gas injection process is the same as that of the brine column and cannot be ignored. However, as the gas injection progresses, the density of the air changes all the time. Therefore, it is necessary to calibrate the pressure of the air column. During the wellbore stage of gas injection and brine removal, 3-5 intermediate stops are set to calibrate the air column pressure difference. The specific calculation method of the air column pressure difference is as follows:

[0096] According to the brine discharge volume V measured by the flow meter at the brine discharge wellhead, the liquid level difference h between the two wells can be accurately calculated:

[0097]

[0098] Where: r is the inner diameter of the technical casing (production casing).

[0099] According to the pressure balance, we can get:

[0100] P 气 +ΔP 气 =P 卤 +ρ 饱 gh

[0101] Where: P 气 Refers to the gas pressure at the injection wellhead; ΔP气 It refers to the pressure of the gas column injected into the well; P 卤 It refers to the pressure at the mouth of the brine drainage well; ρ 饱 It refers to the density of saturated brine; h refers to the height difference of liquid level between two wells.

[0102] In this way, the pressure difference of the air column at different pressures and heights can be obtained, providing measured data for the subsequent calculation of the air column pressure difference.

[0103] 3. For the operation of releasing gas and returning brine, please refer to Figure 3 , release high-pressure air 16 from the injection well 6 into the atmosphere to reduce the air pressure in the injection well; at the same time, open the wellhead of the brine drainage well 7 to allow the atmosphere to enter the brine drainage well. As the pressure of the injection well 6 decreases, the brine liquid level in the brine drainage well 7 will gradually decrease, and eventually the gas-liquid interface will reach the target level. The process of releasing gas and returning brine mainly monitors the position of the gas-liquid interface and the wellhead pressure of the injection well 6. And judge whether the saturated brine 17 has entered the injection well based on the pressure change rate of the injection well 6.

[0104] 4. For manual top release and pressure relief operation, please refer to Figure 4 , relying on strong ground stress to achieve roof collapse. In this process, the underground conditions are mainly monitored. In order to better monitor the underground conditions, one well (such as brine drainage well 7) is closed and one well (such as injection well 6) is opened to maintain the difference between the two wells, and the gas pressure on the brine drainage well 7 side and the wellbore sound on the injection well 6 side are monitored.

[0105] In summary, the present application proposes a method for constructing a sediment-type reservoir in ultra-deep formations. Through preliminary preparation work, gas injection and brine removal operations, gas release and brine return operations, and artificial roof release and pressure relief operations, the method of artificial roof release of the dissolution cavity is adopted. By reducing the internal pressure of the cavity and utilizing the huge ground stress, the interlayer is caused to collapse, the dissolution cavity is filled, and a sediment-type reservoir is formed. Then, the effect of the sediment on the cavity wall is utilized to maintain the stability of the cavity.

[0106] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0107] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0108] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0111] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0112] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0114] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or 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 a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0115] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for constructing an ultra-deep stratum sediment reservoir, characterized in that: include: Injecting target liquid into the target salt well injection well so that the injection well and the brine drainage well are filled with saturated brine; Injecting high-pressure gas into the injection well to cause the brine discharge well to discharge a target volume of saturated brine; Stop injecting the high-pressure gas and open the wellhead of the injection well to release the high-pressure gas into the atmosphere; Opening the wellhead of the brine drainage well to allow atmospheric air to enter the brine drainage well so that the gas-liquid interface reaches a target level, so that the roof collapses to form the sediment-type reservoir; Also includes: During the roof collapse, controlling the injection well and the brine drainage well to have different closing states; The dynamic data of the target salt well is obtained to monitor the progress of the roof collapse; the dynamic data includes the gas pressure of the brine drainage well and the wellbore sound of the injection well, and the target liquid includes the saturated brine.

2. The method for constructing an ultra-deep stratum sediment reservoir according to claim 1, characterized in that: The target salt well is a salt well with an open surface and a recovery rate higher than 80%.

3. The method for constructing an ultra-deep stratum sediment reservoir according to claim 1, characterized in that: The height of the casing shoe of the injection well is higher than the height of the casing shoe of the brine drainage well.

4. The method for constructing an ultra-deep stratum sediment reservoir according to claim 1, characterized in that: Also includes: During the process of injecting high-pressure gas into the injection well, a preset number of gas injection stop operations are performed to calibrate the air column pressure difference.

5. The method for constructing an ultra-deep stratum sediment reservoir according to claim 3, characterized in that: Checking the air column pressure difference includes: The air column pressure difference is checked by the following formula: P 气 +ΔP 气 =P 卤 +ρ 饱 gh Where P 气 is the gas pressure at the injection wellhead, ΔP 气 is the pressure of the gas column injected into the well, P 卤 is the pressure at the brine drainage wellhead, ρ 饱 is the density of saturated brine, h is the height difference between the injection well and the drainage well, V is the volume of brine discharged from the drainage well, r is the inner diameter of the casing, and g is the acceleration due to gravity.

6. The method for constructing an ultra-deep stratum sediment reservoir according to claim 1, characterized in that: Also includes: In the process of stopping the injection of the high-pressure gas and opening the wellhead of the injection well, obtaining the rate of change of the wellhead pressure of the injection well; Whether the saturated brine enters the injection well is determined based on the wellhead pressure change rate.

7. The method for constructing an ultra-deep stratum sediment reservoir according to claim 1, characterized in that: Also includes: Perform well cleaning operations on the injection well and the brine drainage well.

Images