Method and device for predicting dynamic breakthrough pressure of gas storage

Abstract

According to the method for predicting the dynamic breakthrough pressure of the gas storage provided by the embodiment of the invention, the breakthrough pressure of one cover rock core is tested, so that the breakthrough pressure of the gas storage under different operation pressure conditions can be quickly obtained. The embodiment of the invention has the advantages of more accurate breakthrough pressure prediction result, rapid calculation, small experimental test workload and the like, is suitable for scenes of rapid evaluation of working conditions of the breakthrough pressure of geologic body cap strata of gas reservoirs, gas reservoirs, oil reservoirs and the like, and fills the industry blank of rapid acquisition of the dynamic breakthrough pressure field of the cap strata.

Description

Technical Field

[0001] This invention relates to the field of rock physics experimental testing, and in particular to a method and apparatus for predicting dynamic breakthrough pressure in a gas storage facility. Background Technology

[0002] Increasing the operating pressure of gas storage facilities is an important measure to rapidly and significantly increase the working gas volume. However, whether the sealing performance of the gas storage facility above the reservoir can withstand the required increase in upper limit pressure is the key to pressurization operation. How to quantitatively predict the sealing performance of the gas storage facility under the background of increased reservoir pressure is a technical problem that has troubled researchers of large-scale underground gas storage.

[0003] Currently, methods for obtaining the breakthrough pressure of gas storage facilities under continuously changing reservoir fluid pressure conditions have certain limitations. For example, they may not consider changes in reservoir stress, or while considering the influence of dynamic pressure, they may only consider the effect of dynamic pressure on the gas storage facility's permeability, neglecting changes in porosity. Furthermore, they rely on numerous breakthrough pressure experiments to regress the relationship between breakthrough pressure and permeability. Therefore, these methods either fail to consider dynamic conditions adequately or have insufficient consideration, resulting in poor accuracy when predicting the dynamic breakthrough pressure of gas storage facilities. Thus, an accurate prediction method for forecasting the upper limit pressure of gas storage facilities is urgently needed. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a method and apparatus for predicting dynamic breakthrough pressure of gas storage tanks that overcomes or at least partially solves the above problems.

[0005] In a first aspect, embodiments of the present invention provide a method for predicting dynamic breakthrough pressure in a gas storage facility, comprising:

[0006] Based on the breakthrough pressure of the pre-obtained core samples, the breakthrough pressure of each point in the gas storage facility under different operating pressures is predicted.

[0007] In one embodiment, predicting the dynamic breakthrough pressure of each point in the gas storage facility under different operating pressures based on the breakthrough pressure of pre-acquired core samples includes:

[0008] The breakthrough pressure of the pre-acquired core sample is input into the following formula to obtain the predicted breakthrough pressure of each point in the gas storage facility under different operating pressures:

[0009]

[0010] Where: p dci p is the breakthrough pressure at the point described in the gas storage facility. co The breakthrough pressure of the core sample; k o φ represents the permeability of the core sample. odenoted as ρ, where ρ is the porosity of the core; f(P) is the ratio of permeability to porosity at the point in the gas storage facility; and P is the operating pressure of the gas storage facility.

[0011] In one embodiment, f(P) is obtained as follows:

[0012] The permeability-to-porosity ratio data of the gas storage core samples are obtained under multiple upper pressure limits. Regression processing is then performed on the pre-obtained permeability-to-porosity ratio data of the gas storage core samples and the upper pressure limits to obtain f(P). -1 Find f(P). -1 The inverse function of f(P) is obtained.

[0013] In one embodiment, the breakthrough pressure of the pre-acquired core sample is obtained in the following manner:

[0014] Collect rock cores;

[0015] The breakthrough pressure of the rock core was determined using a pre-defined method for measuring rock gas breakthrough pressure.

[0016] Secondly, embodiments of the present invention provide a device for predicting dynamic breakthrough pressure in a gas storage facility, comprising:

[0017] The prediction module is used to predict the breakthrough pressure of each point in the gas storage facility under different operating pressures, based on the breakthrough pressure of the pre-acquired core samples.

[0018] In one embodiment, the prediction module is further configured to input the pre-acquired core breakthrough pressure into the following formula to obtain the predicted dynamic breakthrough pressure of each point in the gas storage facility under different operating pressures:

[0019]

[0020] Where: p dci The dynamic breakthrough pressure at the point described in the gas storage facility; p co The breakthrough pressure of the core sample; k o φ represents the permeability of the core sample. o denoted as ρ, where ρ is the porosity of the core; f(P) is the ratio of permeability to porosity at the point in the gas storage facility; and P is the operating pressure of the gas storage facility.

[0021] In one embodiment, the prediction module is further configured to acquire permeability to porosity ratio data of the gas storage core under multiple upper limit pressures, and perform regression processing on the pre-acquired permeability to porosity ratio data of the gas storage core and the upper limit pressure to obtain f(P). -1 Find f(P). -1 The inverse function of f(P) is obtained.

[0022] Thirdly, embodiments of the present invention provide a computing device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the program executed by the processor is a method for predicting dynamic breakthrough pressure of a gas storage facility.

[0023] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements a method for predicting dynamic breakthrough pressure in a gas storage facility.

[0024] Fifthly, embodiments of the present invention provide a computer program product, the computer program product including a computer program, which, when executed by a processor, implements a method for predicting dynamic breakthrough pressure in a gas storage facility.

[0025] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0026] The method for predicting dynamic breakthrough pressure of gas storage facilities provided in this invention rapidly calculates the breakthrough pressure of a gas storage facility under different operating pressure conditions by testing the breakthrough pressure of a caprock core. This invention offers advantages such as more accurate breakthrough pressure prediction results, faster calculation, and less experimental testing workload. It is suitable for scenarios requiring rapid evaluation of breakthrough pressure in caprock layers of geological bodies such as gas reservoirs, gas storage facilities, and oil reservoirs, filling a gap in the industry for rapidly acquiring dynamic breakthrough pressure fields of caprock layers.

[0027] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a structural block diagram of the rock gas breakthrough pressure measuring device provided in an embodiment of the present invention. Detailed Implementation

[0031] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0032] To address the aforementioned technical problems, embodiments of the present invention provide a method for predicting dynamic breakthrough pressure in a gas storage facility, comprising:

[0033] Based on the breakthrough pressure of the pre-obtained core samples, the breakthrough pressure of each point in the gas storage facility under different operating pressures is predicted.

[0034] The method for predicting dynamic breakthrough pressure of gas storage facilities provided in this invention rapidly calculates the breakthrough pressure of a gas storage facility under different operating pressure conditions by testing the breakthrough pressure of a caprock core. This invention offers advantages such as more accurate breakthrough pressure prediction results, faster calculation, and less experimental testing workload. It is suitable for scenarios requiring rapid evaluation of breakthrough pressure in caprock layers of geological bodies such as gas reservoirs, gas storage facilities, and oil reservoirs, filling a gap in the industry for rapidly acquiring dynamic breakthrough pressure fields of caprock layers.

[0035] Specifically, the aforementioned method for predicting dynamic overrun pressure in gas storage facilities can be implemented, for example, in the following ways:

[0036] By inputting the pre-obtained core sample breakthrough pressure into the following formula, the predicted breakthrough pressure of each point in the gas storage facility under different operating pressures can be obtained:

[0037]

[0038] Where: p dci Breakthrough pressure at the gas storage site; p co The breakthrough pressure of the core sample; k o φ represents the permeability of the core sample. o denoted as ρ, where ρ is the porosity of the core; f(P) is the ratio of permeability to porosity at the gas storage point; and P is the operating pressure of the gas storage facility.

[0039] In one embodiment, f(P) can be obtained, for example, in the following manner:

[0040] The permeability-to-porosity ratio data of gas storage core samples were obtained under multiple upper pressure limits. Regression processing was performed on the pre-obtained permeability-to-porosity ratio data of gas storage core samples and the upper pressure limits to obtain f(P). -1 Find f(P). -1 The inverse function of f(P) is obtained.

[0041] In the aforementioned method, the pre-obtained breakthrough pressure of the core sample can be obtained, for example, in the following manner:

[0042] Collect rock cores;

[0043] The breakthrough pressure of the rock core was determined using a pre-defined method for measuring rock gas breakthrough pressure.

[0044] The aforementioned method for measuring rock gas breakthrough pressure can be illustrated by, for example, by referring to, the device structure block diagram. Figure 1 As shown, for example, it may include the following steps:

[0045] Core preparation; for example, cores can be prepared according to the lithology of the core and actual needs;

[0046] Place the core into the core holder 2;

[0047] Set experimental parameters; experimental parameters can be set by referring to the lithology data of the core sample, for example.

[0048] Connect the gas source to the rock sample inlet 1;

[0049] The flow rate is monitored at the rock sample outlet 3. When bubbles escape uniformly and continuously, the pressure difference between the rock sample inlet 1 and the rock sample outlet 3 is the breakthrough pressure of the core. Any method can be used to determine the breakthrough pressure of the core; this embodiment of the invention does not limit this method.

[0050] Based on the same inventive concept, embodiments of the present invention also provide a device for predicting dynamic breakthrough pressure in a gas storage facility, comprising:

[0051] The prediction module is used to predict the breakthrough pressure of each point in the gas storage facility under different operating pressures, based on the breakthrough pressure of the pre-acquired core samples.

[0052] In one embodiment, the prediction module is further configured to input the pre-acquired core breakthrough pressure into the following formula to obtain the predicted dynamic breakthrough pressure of each point in the gas storage facility under different operating pressures:

[0053]

[0054] Where: p dci The dynamic breakthrough pressure of the gas storage site; p co The breakthrough pressure of the core sample; k o φ represents the permeability of the core sample. o denoted as ρ, where ρ is the porosity of the core; f(P) is the ratio of permeability to porosity at the gas storage point; and P is the operating pressure of the gas storage facility.

[0055] To address the limitations of current methods for obtaining dynamic breakthrough pressure of caprock, this invention, through theoretical derivation, incorporates the influence of the upper limit pressure of the gas storage facility on the breakthrough pressure of mudstone into the stress-sensitive parameters of conventional porosity and permeability, thereby enabling the rapid prediction of the breakthrough pressure of the caprock under different operating pressure conditions of the gas storage facility using the results of a single breakthrough pressure test.

[0056] In one embodiment, the prediction module is further used to obtain the ratio of permeability to porosity of the gas storage core under multiple upper limit pressures, and to perform regression processing on the pre-obtained ratio of permeability to porosity of the gas storage core and the upper limit pressure to obtain f(P).

[0057] Based on the same inventive concept, embodiments of the present invention also provide a computing device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the program executed by the processor is a method for predicting dynamic breakthrough pressure of a gas storage tank.

[0058] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, realizes a method for predicting dynamic breakthrough pressure in a gas storage facility.

[0059] Based on the same inventive concept, embodiments of the present invention also provide a computer program product, which includes a computer program that, when executed by a processor, implements a method for predicting dynamic breakthrough pressure in a gas storage facility.

[0060] Since the principle behind these devices is similar to the aforementioned method for predicting dynamic breakthrough pressure in gas storage facilities, the implementation of these devices can be found in the implementation of the aforementioned method, and the repetitions will not be repeated.

[0061] The method for predicting dynamic breakthrough pressure of gas storage facilities provided in this invention is applicable to the quantitative evaluation of the direct caprock pressure range prediction for gas storage facilities converted from gas reservoirs, oil reservoirs, and water-bearing formations. It only requires testing the breakthrough pressure of one core sample. The breakthrough pressure of the core sample is then mathematically transformed using the method provided in this invention to predict the dynamic breakthrough pressure at a specific point in the gas storage facility. By analyzing the breakthrough pressures at all points in the gas storage facility, a breakthrough pressure field under dynamic conditions covering the entire area is obtained, providing detailed and scientific support for the dynamic sealing performance of the caprock for decision-making experts.

[0062] In this embodiment of the invention, to discuss the range of increasing the upper limit pressure of a gas storage facility in a certain region, a group of mudstone caprock was drilled and the breakthrough pressure of the core was obtained by experimental testing at 7.62 MPa. Based on this, using the prediction method for dynamic breakthrough pressure of gas storage facilities provided in this embodiment of the invention, it is predicted that after the upper limit pressure of the gas storage facility is increased by 10%, the breakthrough pressure of the gas storage facility will be 6.95 MPa, which is close to the breakthrough pressure of 7.0 MPa obtained by actual experimental testing.

[0063] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0064] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0065] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0066] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1The steps of the functions specified in one or more boxes. Obviously, those skilled in the art can make various modifications and variations to this invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A method for predicting dynamic breakthrough pressure in a gas storage facility, characterized in that, include: Based on the breakthrough pressure of the pre-obtained core samples, the breakthrough pressure of each point in the gas storage facility under different operating pressures is predicted.

2. The method as described in claim 1, characterized in that, The method of predicting the dynamic breakthrough pressure of each point in the gas storage facility under different operating pressures based on the breakthrough pressure of pre-acquired core samples includes: The breakthrough pressure of the pre-obtained core sample is input into the following formula to obtain the predicted breakthrough pressure of each point in the gas storage facility under different operating pressures: Where: p dci p is the breakthrough pressure at the point described in the gas storage facility. co For the breakthrough pressure of the rock core; k o φ represents the permeability of the core sample. o denoted as ρ, where ρ is the porosity of the core; f(P) is the ratio of permeability to porosity at the point in the gas storage facility; and P is the operating pressure of the gas storage facility.

3. The method as described in claim 2, characterized in that, The f(P) is obtained in the following manner: The permeability-to-porosity ratio data of the gas storage core samples are obtained under multiple upper pressure limits. Regression processing is then performed on the pre-obtained permeability-to-porosity ratio data of the gas storage core samples and the upper pressure limits to obtain f(P). -1 Find f(P). -1 The inverse function of f(P) is obtained.

4. The method as described in claim 1, characterized in that, The breakthrough pressure of the pre-acquired core sample is obtained through the following method: Collect rock cores; The breakthrough pressure of the rock core was determined using a pre-defined method for measuring rock gas breakthrough pressure.

5. A device for predicting dynamic breakthrough pressure in a gas storage facility, characterized in that, include: The prediction module is used to predict the breakthrough pressure of each point in the gas storage facility under different operating pressures, based on the breakthrough pressure of the pre-acquired core samples.

6. The apparatus as claimed in claim 5, characterized in that, The prediction module is further used to input the pre-acquired core breakthrough pressure into the following formula to obtain the predicted dynamic breakthrough pressure of each point in the gas storage facility under different operating pressures: Where: p dci The dynamic breakthrough pressure at the point described in the gas storage facility; p co For the breakthrough pressure of the rock core; k o φ represents the permeability of the core sample. o denoted as ρ, where ρ is the porosity of the core; f(P) is the ratio of permeability to porosity at the point in the gas storage facility; and P is the operating pressure of the gas storage facility.

7. The apparatus as claimed in claim 6, characterized in that, The prediction module is further used to obtain the ratio of permeability to porosity of the gas storage core under multiple upper limit pressures, and to perform regression processing on the pre-obtained ratio of permeability to porosity of the gas storage core and the upper limit pressure to obtain f(P). -1 Find f(P). -1 The inverse function of f(P) is obtained.

8. A computing device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the program executed by the processor implements the method for predicting dynamic breakthrough pressure of a gas storage facility as described in any one of claims 1-4.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method for predicting dynamic breakthrough pressure of a gas storage facility as described in any one of claims 1-4.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method for predicting dynamic breakthrough pressure of a gas storage facility as described in any one of claims 1-4.

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