Method, system and computer equipment for determining reasonable production pressure difference of gas reservoir water production well

Abstract

The present invention provides a method, system and computer equipment for determining the reasonable production pressure difference of a water-producing well in a gas reservoir, belonging to the technical field of oil and gas reservoir development, wherein the determination method includes: determining the basic parameters of the target gas well and the gas reservoir; calculating and obtaining the daily gas production set and the daily water production set under different production pressure differences according to the basic parameters of the target gas well and the gas reservoir; establishing a first curve according to the daily gas production set; establishing a second curve according to the daily water production set; establishing a third curve according to the first curve and the second curve; determining the maximum difference between the daily gas production and the daily water production according to the third curve, and determining the production pressure difference corresponding to the maximum difference as the reasonable production pressure difference of the target gas well. The present invention solves the technical problem that it is difficult to accurately determine the reasonable production pressure difference of a water-producing well in a fractured edge water gas reservoir, provides a basis for the reasonable production allocation of gas wells and the technical adjustment of gas reservoirs, and has a positive meaning for improving the development effect and benefit of fractured edge water gas reservoirs.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a method, a system and a computer device for determining a reasonable production pressure difference of a water-producing well in a gas reservoir. Background Art

[0002] Natural gas is a non-renewable resource. In recent years, with the surge in domestic demand for natural gas, natural gas production has grown rapidly. The exploration and development of natural gas reservoirs in conventional reservoirs are becoming increasingly mature. Newly discovered natural gas resources are mostly stored in relatively complex gas reservoirs. Fractured edge water gas reservoirs are a relatively complex type of gas reservoir. Due to the widespread development of natural fractures and edge water, this type of gas reservoir is severely affected by water invasion during the development process.

[0003] Domestic fractured edge-water gas reservoirs are mainly distributed in the Sichuan, Tarim and Songliao basins. Among them, the deep fractured edge-water gas reservoirs in the Tarim Basin are the most typical, with the characteristics of deep burial, high pressure and complex fracture distribution.

[0004] Since the distribution of natural fractures is highly random and the scales vary greatly, including small-scale micro-fractures, large-scale faults and cracks, the water invasion law of fractured edge-water gas reservoirs is complex, and it is relatively difficult to determine the reasonable production scale, especially the difficulty in determining the reasonable production pressure difference of gas wells, which also brings great uncertainty to the preparation of gas reservoir development plans and the adjustment of technical countermeasures. Therefore, accurately determining the reasonable production pressure difference of water-producing wells is of great significance to improving the development effect and benefits of fractured edge-water gas reservoirs. Summary of the invention

[0005] In view of the above problems, the present invention provides a method, system and computer equipment for determining the reasonable production pressure difference of water-producing wells in gas reservoirs. The present invention can determine the reasonable production pressure difference of water-producing wells in this type of gas reservoir, which has positive significance for improving the development effect and benefits of fractured edge-water gas reservoirs.

[0006] A method for determining a reasonable production pressure difference of a gas reservoir water-producing well, which is applied to the production of fractured edge-water gas reservoirs, comprises the following steps:

[0007] Determine the basic parameters of target gas wells and gas reservoirs;

[0008] According to the target gas well and gas reservoir basic parameters, the daily gas production set and daily water production set under different production pressure differences are calculated;

[0009] A first curve is established based on the daily gas production set; a second curve is established based on the daily water production set;

[0010] Establishing a third curve based on the first curve and the second curve;

[0011] According to the third curve, the maximum difference between the daily gas production and the daily water production is determined, and the production differential pressure corresponding to the maximum difference is determined as the reasonable production differential pressure of the target gas well.

[0012] Furthermore, the basic parameters of the target gas well and gas reservoir include leakage area, formation pressure, bottom hole pressure, temperature under standard conditions, gas deviation coefficient under standard conditions, gas viscosity under formation conditions, gas deviation coefficient under formation conditions, gas reservoir temperature, pressure under standard conditions, flow distance, reservoir permeability, non-Darcy flow coefficient, gas density, reservoir fracture permeability and water viscosity.

[0013] Furthermore, according to the target gas well and gas reservoir basic parameters, the daily gas production set and the daily water production set under different production pressure differences are calculated as follows:

[0014] Establish a production pressure difference model based on the basic parameters of the target gas well and gas reservoir;

[0015] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated;

[0016] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily water production set under different production pressure differences is calculated.

[0017] Furthermore, a production pressure difference model is established based on the basic parameters of the target gas well and gas reservoir, as follows:

[0018] Simulate the formation pressure and bottom hole pressure for n days and calculate the production pressure difference model, as follows:

[0019] Δp n =pe n -pw n

[0020] Δp={Δp 1 ,Δp 2 ,...,Δp n}

[0021] In the formula, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on the nth day, Δp is the production pressure difference model, that is, the set of production pressure differences on n days, n = 1, 2, 3...

[0022] Furthermore, according to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated as follows:

[0023] According to the n-day production pressure difference in the production pressure difference model, the daily gas production set is calculated as follows:

[0024]

[0025] qg={qg 1 ,qg 2 ,...,qg n}

[0026] Where A is the discharge area, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on day n, qg n represents the daily gas production on the nth day, T sc is the temperature under standard conditions, Z sc is the gas deviation coefficient under standard conditions, qg is the daily gas production of gas wells, μ g is the gas viscosity under formation conditions, Z is the gas deviation coefficient under formation conditions, T is the gas reservoir temperature, p sc is the pressure under standard conditions, L is the flow distance, K is the reservoir permeability, β is the non-Darcy flow coefficient, is the gas density, n=1,2,3…

[0027] Furthermore, according to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily water production set under different production pressure differences is calculated as follows:

[0028] According to the n-day production pressure difference in the production pressure difference model, the daily water production set is calculated as follows:

[0029]

[0030] qw={qw 1 ,qw 2 ,...,qw n}

[0031] In the formula, A is the discharge area, L is the flow distance, K is f is the reservoir fracture permeability, qw n is the daily water production on day n, Δp n represents the production pressure difference on the nth day, qw is the daily water production of the gas well, μ w is the viscosity of water, n=1,2,3...

[0032] Furthermore, a first curve is established based on the daily gas production set; a second curve is established based on the daily water production set, as follows:

[0033] The first curve is generated by taking the production pressure difference of the production pressure difference model on n days as the horizontal coordinate and the corresponding daily gas production on n days as the vertical coordinate;

[0034] The second curve has the same abscissa as the first curve, and the corresponding daily water production on n days is used as the ordinate to generate the second curve.

[0035] Furthermore, the process of establishing the third curve according to the first curve and the second curve is as follows:

[0036] The third curve has the same abscissa as the first curve and the second curve, and the third curve is generated by taking the difference between the ordinate values ​​of the first curve and the second curve as the ordinate.

[0037] Furthermore, the maximum difference between the daily gas production and the daily water production is determined to be the maximum value of the vertical coordinate in the third curve.

[0038] The present invention also provides a system for determining a reasonable production pressure difference of a gas reservoir water-producing well, comprising:

[0039] Parameter input module, used to determine the basic parameters of target gas wells and gas reservoirs;

[0040] A calculation module is used to calculate and obtain a set of daily gas production and a set of daily water production under different production pressure differences according to the target gas well and gas reservoir basic parameters;

[0041] A first curve drawing module is used to establish a first curve according to a daily gas production set; and to establish a second curve according to a daily water production set;

[0042] A second curve drawing module, used for establishing a third curve according to the first curve and the second curve;

[0043] The determination module is used to determine the maximum difference between the daily gas production and the daily water production according to the third curve, and determine the production pressure difference corresponding to the maximum difference as the reasonable production pressure difference of the target gas well.

[0044] Furthermore, the calculation module is used to establish a production pressure difference model through basic parameters of the target gas well and gas reservoir;

[0045] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated;

[0046] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated;

[0047] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily water production set under different production pressure differences is calculated.

[0048] Furthermore, the calculation module is used to simulate the formation pressure and bottom hole pressure on n days, and calculate the production pressure difference model, as follows:

[0049] Δp n =pe n -pw n

[0050] Δp={Δp 1 ,Δp 2 ,...,Δp n}

[0051] In the formula, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on the nth day, Δp is the production pressure difference model, that is, the set of production pressure differences on n days, n = 1, 2, 3...

[0052] Furthermore, the calculation module is used to calculate and obtain a daily gas production volume set according to the n-day production pressure difference in the production pressure difference model, as follows:

[0053]

[0054] qg={qg 1 ,qg 2 ,...,qg n}

[0055] Where A is the discharge area, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on day n, qg n represents the daily gas production on the nth day, T sc is the temperature under standard conditions, Z sc is the gas deviation coefficient under standard conditions, qg is the daily gas production of gas wells, μ g is the gas viscosity under formation conditions, Z is the gas deviation coefficient under formation conditions, T is the gas reservoir temperature, p sc is the pressure under standard conditions, L is the flow distance, K is the reservoir permeability, β is the non-Darcy flow coefficient, is the gas density, n=1,2,3…

[0056] Furthermore, the calculation module is used to calculate and obtain a daily water production set according to the n-day production pressure difference in the production pressure difference model, as follows:

[0057]

[0058] qw={qw1 ,qw 2 ,...,qw n}

[0059] In the formula, A is the discharge area, L is the flow distance, K is f is the reservoir fracture permeability, qw n is the daily water production on day n, Δp n represents the production pressure difference on the nth day, qw is the daily water production of the gas well, μ w is the viscosity of water, n=1,2,3...

[0060] The present invention also provides a computer device, including a memory, a processor, a communication interface and an internal bus. The memory stores a computer program, and the processor implements a method for determining a reasonable production pressure difference of a gas reservoir water-producing well when executing the computer program.

[0061] The present invention also provides a computer storage medium, in which a computer program is stored. The computer storage medium is read by a processor and the computer program stored in the computer storage medium is executed to implement a method for determining a reasonable production pressure difference of a gas reservoir water-producing well.

[0062] Beneficial effects of the present invention: The present invention compares the daily water production and gas production of the water-producing gas well to determine the production pressure difference when the daily gas production of the gas well is relatively large and the daily water production is relatively small as the reasonable production pressure difference of the target gas well, thereby solving the technical problem that it is difficult to accurately determine the reasonable production pressure difference of water-producing wells in fractured edge-water gas reservoirs, providing a basis for reasonable production allocation of gas wells and technical adjustment of gas reservoirs, and having positive significance for improving the development effect and benefits of fractured edge-water gas reservoirs.

[0063] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 A schematic flow chart of a method for determining a reasonable production pressure difference of a water-producing well in a gas reservoir according to an embodiment of the present invention is shown;

[0066] Figure 2A schematic diagram showing the daily gas production, daily water production and difference relationship under different production pressure differences according to an embodiment of the present invention is shown;

[0067] Figure 3 A schematic structural diagram of a system for determining a reasonable production pressure difference of a water-producing well in a gas reservoir according to an embodiment of the present invention is shown;

[0068] Figure 4 A schematic structural diagram of a computer device according to an embodiment of the present invention is shown.

[0069] In the figure: 302, memory; 304, processor; 306, communication interface; 308, internal bus. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] The gas well productivity is closely related to the production pressure difference. An unreasonable production pressure difference will lead to unreasonable gas well production. If the production pressure difference of the gas well is too small, the potential of the gas well cannot be brought into play; if the production pressure difference is too large, it will cause the gas well pressure to drop quickly, the physical properties around the well to deteriorate, the velocity-sensitive effect will occur, water will be produced, and other adverse consequences that reduce production efficiency. Therefore, it is extremely necessary to determine the reasonable limit of the production pressure difference of the gas well.

[0072] See also Figure 1 , Figure 1 A flow chart of a method for determining a reasonable production pressure difference of a water-producing well in a gas reservoir according to an embodiment of the present invention is shown.

[0073] The embodiment of the present invention provides a method for determining a reasonable production pressure difference of a water-producing well in a gas reservoir, which is applied to the production of a fractured edge-water gas reservoir, and includes the following steps:

[0074] S1. Determine the basic parameters of the target gas well and gas reservoir.

[0075] Specifically, the basic parameters of the target gas wells and gas reservoirs include leakage area, formation pressure, bottom hole pressure, temperature under standard conditions, gas deviation coefficient under standard conditions, gas viscosity under formation conditions, gas deviation coefficient under formation conditions, gas reservoir temperature, pressure under standard conditions, flow distance, reservoir permeability, non-Darcy flow coefficient, gas density, reservoir fracture permeability and water viscosity.

[0076] S2. According to the target gas well and gas reservoir basic parameters, the daily gas production set and the daily water production set under different production pressure differences are calculated.

[0077] In this step, according to the target gas well and gas reservoir basic parameters, the daily gas production set and the daily water production set under different production pressure differences are calculated, as follows:

[0078] S21. Establish a production pressure difference model based on the basic parameters of the target gas well and gas reservoir.

[0079] In this step, the formation pressure and bottom hole pressure on day n are simulated to calculate the production pressure difference model, as follows:

[0080] Δp n =pe n -pw n

[0081] Δp={Δp 1 ,Δp 2 ,...,Δp n}

[0082] In the formula, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on the nth day, Δp is the production pressure difference model, that is, the set of production pressure differences on n days, n = 1, 2, 3...

[0083] S22. Calculate and obtain a set of daily gas production under different production pressure differences based on the production pressure difference model and basic parameters of the target gas well and gas reservoir.

[0084] In this step, the daily gas production set is calculated based on the n-day production pressure difference in the production pressure difference model, as follows:

[0085]

[0086] qg={qg 1 ,qg 2 ,...,qg n}

[0087] Where A is the discharge area, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on day n, qg n represents the daily gas production on the nth day, T sc is the temperature under standard conditions, Z sc is the gas deviation coefficient under standard conditions, qg is the daily gas production of gas wells, μ gis the gas viscosity under formation conditions, Z is the gas deviation coefficient under formation conditions, T is the gas reservoir temperature, p sc is the pressure under standard conditions, L is the flow distance, K is the reservoir permeability, β is the non-Darcy flow coefficient, is the gas density, n=1,2,3…

[0088] S23. According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, a set of daily water production under different production pressure differences is calculated.

[0089] In this step, the daily water production set is calculated based on the n-day production pressure difference in the production pressure difference model, as follows:

[0090]

[0091] qw={qw 1 ,qw 2 ,...,qw n}

[0092] In the formula, A is the discharge area, L is the flow distance, K is f is the reservoir fracture permeability, qw n is the daily water production on day n, Δp n represents the production pressure difference on the nth day, qw is the daily water production of the gas well, μ w is the viscosity of water, n=1,2,3...

[0093] S3. Establish a first curve based on the daily gas production set; establish a second curve based on the daily water production set.

[0094] See also Figure 2 , Figure 2 A schematic diagram of daily gas production, daily water production and difference relationship under different production pressure differences according to an embodiment of the present invention is shown.

[0095] Specifically, according to the daily gas production set, the process of establishing the first curve is as follows:

[0096] The first curve is generated by taking the n-day production pressure difference of the production pressure difference model as the abscissa and the corresponding n-day daily gas production as the ordinate.

[0097] Specifically, according to the daily water production set, the process of establishing the second curve is as follows:

[0098] The second curve has the same abscissa as the first curve, and the corresponding daily water production on n days is used as the ordinate to generate the second curve.

[0099] S4. Create a third curve based on the first curve and the second curve.

[0100] Specifically, the abscissa of the third curve is the same as that of the first curve and the second curve, and the difference between the ordinate values ​​of the first curve and the second curve is used as the ordinate to generate the third curve.

[0101] The difference between the ordinate values ​​of the first curve and the second curve is the difference between the daily gas production and the daily water production on the corresponding n days.

[0102] Specifically, for this embodiment, the first curve, the second curve and the third curve are as follows: Figure 2 shown.

[0103] S5. According to the third curve, determine the maximum difference between the daily gas production and the daily water production, and determine the production differential pressure corresponding to the maximum difference as the reasonable production differential pressure of the target gas well.

[0104] Specifically, the maximum value of the ordinate of the third curve is determined, which is the maximum difference between the daily gas production and the daily water production under the same production pressure difference; the reasonable production pressure difference of the target gas well is determined, which refers to the production pressure difference corresponding to the maximum value of the ordinate in the third curve.

[0105] The method of this embodiment can intuitively determine the reasonable production pressure difference of the target gas well through the first curve, the second curve and the third curve, is easy to implement, and is convenient for guiding the production and exploitation of the target gas well.

[0106] In the specific implementation, the basic parameters of the target gas well and gas reservoir are: formation pressure of 120 MPa, gas viscosity of 0.046 mPa per second, gas density of 0.00067 g / cm3, deviation coefficient of 1.8, gas reservoir temperature of 160 degrees Celsius, reservoir permeability of 0.5 mDarcy, drainage area of ​​5000 square meters, non-Darcy flow coefficient of 10×10 8 .

[0107] A series of production differential pressures may be 0-30 MPa, with a series of production differential pressure values ​​at intervals of 2 MPa.

[0108] The daily gas production and water production under different production pressure differences are calculated based on the target gas well and gas reservoir basic parameters.

[0109] The daily gas production under a series of production pressure differences is calculated by the method for calculating the daily gas production under different production pressure differences in step S3, and a first curve is drawn with the production pressure difference as the abscissa and the daily gas production as the ordinate.

[0110] The method for calculating the daily water production under different production pressure differences in step S3 is used to calculate the daily water production under a series of production pressure differences, and a second curve is drawn with the production pressure difference as the abscissa and the daily water production as the ordinate.

[0111] Through calculation, the maximum difference between the daily gas production and the daily water production under the same production pressure difference in this embodiment is 20.03, and the production pressure difference corresponding to this value is 4.85 MPa. Therefore, the reasonable production pressure difference of the target gas well is 4.85 MPa.

[0112] Through the method of this embodiment, the daily water production and daily gas production of the water-producing gas well are compared, and the production pressure difference when the daily gas production of the gas well is relatively large and the daily water production is relatively small is determined as the reasonable production pressure difference of the target gas well, which solves the technical problem that it is difficult to accurately determine the reasonable production pressure difference of water-producing wells in fractured edge-water gas reservoirs, provides a basis for reasonable production allocation of gas wells and adjustment of gas reservoir technical policies, and has positive significance for improving the development effect and benefits of fractured edge-water gas reservoirs.

[0113] See also Figure 3 , Figure 3 A structural schematic diagram of a system for determining a reasonable production pressure difference of a water-producing well in a gas reservoir according to an embodiment of the present invention is shown.

[0114] The embodiment of the present invention further provides a system for determining a reasonable production pressure difference of a gas reservoir water-producing well, comprising:

[0115] The parameter input module is used to determine the basic parameters of the target gas well and gas reservoir.

[0116] The calculation module is used to calculate and obtain the daily gas production set and the daily water production set under different production pressure differences according to the target gas well and the basic parameters of the gas reservoir.

[0117] The first curve drawing module is used to establish a first curve according to a daily gas production set; and to establish a second curve according to a daily water production set.

[0118] The second curve drawing module is used to establish a third curve according to the first curve and the second curve.

[0119] The determination module is used to determine the maximum difference between the daily gas production and the daily water production according to the third curve, and determine the production pressure difference corresponding to the maximum difference as the reasonable production pressure difference of the target gas well.

[0120] Specifically, the calculation module is used to establish a production pressure difference model through basic parameters of the target gas well and gas reservoir;

[0121] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated;

[0122] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated;

[0123] According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily water production set under different production pressure differences is calculated.

[0124] Furthermore, the calculation module is used to simulate the formation pressure and bottom hole pressure for n days and calculate the production pressure difference model, as follows:

[0125] Δp n =pe n -pw n

[0126] Δp={Δp 1 ,Δp 2 ,...,Δp n}

[0127] In the formula, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on the nth day, Δp is the production pressure difference model, that is, the set of production pressure differences on n days, n = 1, 2, 3...

[0128] Furthermore, the calculation module is used to calculate and obtain a daily gas production volume set according to the n-day production pressure difference in the production pressure difference model, as follows:

[0129]

[0130] qg={qg 1 ,qg 2 ,...,qg n}

[0131] Where A is the discharge area, Δp n Indicates the production pressure difference on day n, pe n represents the formation pressure on day n, pw n represents the bottom hole pressure on day n, qg n represents the daily gas production on the nth day, T sc is the temperature under standard conditions, Z sc is the gas deviation coefficient under standard conditions, qg is the daily gas production of gas wells, μ g is the gas viscosity under formation conditions, Z is the gas deviation coefficient under formation conditions, T is the gas reservoir temperature, p sc is the pressure under standard conditions, L is the flow distance, K is the reservoir permeability, β is the non-Darcy flow coefficient, is the gas density, n=1,2,3…

[0132] Furthermore, the calculation module is used to calculate and obtain a daily water production set according to the n-day production pressure difference in the production pressure difference model, as follows:

[0133]

[0134] qw={qw 1 ,qw 2 ,...,qw n}

[0135] In the formula, A is the discharge area, L is the flow distance, K is f is the reservoir fracture permeability, qw n is the daily water production on day n, Δp n represents the production pressure difference on the nth day, qw is the daily water production of the gas well, μ w is the viscosity of water, n=1,2,3...

[0136] The first curve drawing module is used to establish the first curve according to the daily gas production set. The process is as follows:

[0137] The first curve is generated by taking the n-day production pressure difference of the production pressure difference model as the abscissa and the corresponding n-day daily gas production as the ordinate.

[0138] It is also used to establish the second curve according to the daily water production set. The process is as follows:

[0139] The second curve has the same abscissa as the first curve, and the corresponding daily water production on n days is used as the ordinate to generate the second curve.

[0140] The process of the determination module for establishing the third curve according to the first curve and the second curve is as follows:

[0141] The third curve has the same abscissa as the first curve and the second curve, and the third curve is generated by taking the difference between the ordinate values ​​of the first curve and the second curve as the ordinate.

[0142] The specific implementation of each module of the system can be obtained from the specific implementation method of the method for determining the reasonable production pressure difference of the gas reservoir water-producing wells mentioned above, and will not be repeated here.

[0143] See also Figure 4 , Figure 4 A schematic structural diagram of a computer device according to an embodiment of the present invention is shown.

[0144] The embodiment of the present invention further provides a computer device, including a memory 302, a processor 304, a communication interface 306 and an internal bus 308. The memory 302 stores a computer program, and when the processor executes the computer program, the method for determining the reasonable production pressure difference of the gas reservoir water-producing well is implemented.

[0145] Specifically, the computer device may be a computer terminal, a server or a similar computing device.

[0146] This embodiment also provides a computer storage medium, in which a computer program is stored. The computer storage medium is read by a processor and the computer program stored in the computer storage medium is executed to implement the method for determining the reasonable production pressure difference of the water-producing wells in the gas reservoir.

[0147] Specifically, computer-readable storage media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer-readable storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable storage media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0148] Although the present invention 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 make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the reasonable production pressure difference of a gas reservoir water-producing well, applied to the production of fractured edge-water gas reservoirs, characterized in that: The following steps are involved: Determine the basic parameters of target gas wells and gas reservoirs; According to the target gas well and gas reservoir basic parameters, the daily gas production set and daily water production set under different production pressure differences are calculated as follows: The production pressure difference model is established based on the basic parameters of the target gas well and gas reservoir, as follows: The daily formation pressure and bottom hole pressure are used to calculate the production pressure difference model, as follows: In the formula, Indicates Daily production pressure difference, Indicates Daily formation pressure, Indicates Daily bottom hole pressure, is the production pressure difference model, that is The collection of daily production pressure difference, ; According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated as follows: The daily production pressure difference is calculated to obtain the daily gas production set, as follows: In the formula, A is the discharge area, Indicates Daily gas production, T sc is the temperature under standard conditions, Z sc is the gas deviation coefficient under standard conditions, q g is the daily gas production of gas wells, μ g is the gas viscosity under formation conditions, Z is the formation condition gas deviation coefficient, T is the reservoir temperature, p sc is the pressure under standard conditions, L is the flow distance, K is the reservoir permeability, β is the non-Darcy flow coefficient, is the gas density; According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily water production set under different production pressure differences is calculated as follows: The daily production pressure difference is calculated to obtain the daily water production set, as follows: In the formula, K f is the reservoir fracture permeability, For the Daily water production, Indicates Daily production pressure difference, q is the daily water production of the gas wells, μ w is the viscosity of water; A first curve is established based on the daily gas production set; a second curve is established based on the daily water production set; Establishing a third curve based on the first curve and the second curve; According to the third curve, the maximum difference between the daily gas production and the daily water production is determined, and the production differential pressure corresponding to the maximum difference is determined as the reasonable production differential pressure of the target gas well.

2. The method for determining the reasonable production pressure difference of a gas reservoir water-producing well according to claim 1, characterized in that: The basic parameters of the target gas wells and gas reservoirs include leakage area, formation pressure, bottom hole pressure, temperature under standard conditions, gas deviation coefficient under standard conditions, gas viscosity under formation conditions, gas deviation coefficient under formation conditions, reservoir temperature, pressure under standard conditions, flow distance, reservoir permeability, non-Darcy flow coefficient, gas density, reservoir fracture permeability and water viscosity.

3. The method for determining the reasonable production pressure difference of a gas reservoir water-producing well according to claim 1, characterized in that: According to the daily gas production set, the first curve is established; according to the daily water production set, the second curve is established, as follows: Production pressure difference model The daily production pressure difference is the horizontal axis, corresponding to The first curve is generated with the daily gas production as the ordinate; The second curve has the same horizontal coordinate as the first curve, corresponding to The second curve is generated with the daily water production as the vertical coordinate.

4. The method for determining the reasonable production pressure difference of a gas reservoir water-producing well according to claim 3 is characterized in that: Based on the first and second curves, the process of establishing the third curve is as follows: The third curve has the same abscissa as the first curve and the second curve, and the third curve is generated by taking the difference between the ordinate values ​​of the first curve and the second curve as the ordinate.

5. The method for determining the reasonable production pressure difference of a gas reservoir water-producing well according to any one of claims 1 to 4, characterized in that: The maximum difference between the daily gas production and the daily water production is determined by the maximum value of the vertical coordinate in the third curve.

6. A system for determining the reasonable production pressure difference of a gas reservoir water-producing well, characterized in that: include: Parameter input module, used to determine the basic parameters of target gas wells and gas reservoirs; The calculation module is used to calculate the daily gas production set and the daily water production set under different production pressure differences according to the target gas well and gas reservoir basic parameters, as follows: The production pressure difference model is established based on the basic parameters of the target gas well and gas reservoir, as follows: The daily formation pressure and bottom hole pressure are used to calculate the production pressure difference model, as follows: In the formula, Indicates Daily production pressure difference, Indicates Daily formation pressure, Indicates Daily bottom hole pressure, is the production pressure difference model, that is The collection of daily production pressure difference, ; According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily gas production set under different production pressure differences is calculated as follows: The daily production pressure difference is calculated to obtain the daily gas production set, as follows: In the formula, A is the discharge area, Indicates Daily gas production, T sc is the temperature under standard conditions, Z sc is the gas deviation coefficient under standard conditions, q g is the daily gas production of gas wells, μ g is the gas viscosity under formation conditions, Z is the formation condition gas deviation coefficient, T is the reservoir temperature, p sc is the pressure under standard conditions, L is the flow distance, K is the reservoir permeability, β is the non-Darcy flow coefficient, is the gas density; According to the production pressure difference model and the basic parameters of the target gas well and gas reservoir, the daily water production set under different production pressure differences is calculated as follows: The daily production pressure difference is calculated to obtain the daily water production set, as follows: In the formula, K f is the reservoir fracture permeability, For the Daily water production, Indicates Daily production pressure difference, q is the daily water production of the gas wells, μ w is the viscosity of water; The first curve drawing module is used to establish a first curve according to a daily gas production set; and to establish a second curve according to a daily water production set; A second curve drawing module, used for establishing a third curve according to the first curve and the second curve; The determination module is used to determine the maximum difference between the daily gas production and the daily water production according to the third curve, and determine the production pressure difference corresponding to the maximum difference as the reasonable production pressure difference of the target gas well.

7. A computer device comprising a memory, a processor, a communication interface and an internal bus, characterized in that: A computer program is stored in the memory, and when the processor executes the computer program, the method for determining the reasonable production pressure difference of a gas reservoir water-producing well as described in any one of claims 1-5 is implemented.

8. A computer storage medium having a computer program stored therein, characterized in that: The computer storage medium is read by the processor and the computer program stored in the computer storage medium is executed to implement the method for determining the reasonable production pressure difference of the gas reservoir water-producing well as described in any one of claims 1-5.

Images