Gas reservoir residual gas quantitative description method, device, equipment, medium and program

Abstract

The invention relates to the field of tight gas reservoir technology development, and provides a gas reservoir residual gas quantitative description method which comprises the following steps: generating a productivity parameter of a tight gas reservoir according to a preset productivity equation; constructing an initial production and storage coefficient definition formula of the tight gas reservoir according to the production capacity parameter and a pre-obtained energy storage parameter; performing target parameter conversion on the initial production and storage coefficient definition formula to obtain a target production and storage coefficient definition formula of the initial production and storage coefficient definition formula; and obtaining physical property parameters of the tight gas reservoir, and generating a production and storage coefficient distribution diagram of the tight gas reservoir according to the physical property parameters and the target production and storage coefficient definition formula. The invention further provides a gas reservoir residual gas quantitative description device, equipment, a medium and a program. The accuracy of quantitative description of the residual gas of the gas reservoir can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tight gas reservoir technology development, and in particular to a method, device, electronic equipment, medium and program for quantitatively describing residual gas in a gas reservoir. Background Art

[0002] The characteristics of tight gas reservoirs are that there is no clear existence of edge and bottom water, the reservoir is highly heterogeneous, and the seepage mechanism is complex. Therefore, the development of tight gas reservoirs requires development characteristics different from those of conventional gas reservoirs. In the later stages of the development process, the distribution of residual gas is affected by many factors, including reservoir properties, water saturation, well network layout, well type selection, development time, and process measures. Accurately understanding the distribution of residual gas is very important for adjusting well deployment, performing potential tapping measures such as plugging holes and layer conversion. Therefore, it is necessary to establish a method that can accurately describe the distribution of residual gas to determine the distribution of residual gas in the gas reservoir to meet the needs of subsequent potential tapping work, thereby improving the utilization rate and recovery rate of reserves.

[0003] At present, the research methods for the distribution of remaining gas in tight gas reservoirs mainly include gas saturation method, pressure method and reserve abundance method. However, each method has certain limitations in application. Among them, the gas saturation method cannot effectively reflect the changes in remaining gas and the energy of the formation; the pressure method uses pressure to describe the reserves or remaining gas at a certain stage of gas field development. However, in tight gas reservoirs, the reservoir heterogeneity is strong. In areas with low gas saturation (high water saturation) and low physical properties, due to the low degree of well network control and low gas well productivity, the production volume is low, but the pressure is higher; although the reserve abundance method avoids the influence of gas saturation parameters, it does not consider the influence of physical properties on the later adjustment of well productivity. Therefore, the current methods for describing the distribution of remaining gas in tight gas reservoirs still have some limitations. How to improve the accuracy of quantitative description of remaining gas in gas reservoirs has become an urgent problem to be solved. Summary of the invention

[0004] In view of the above problems, embodiments of the present invention provide a method, device, electronic device, medium and program for quantitatively describing remaining gas in a gas reservoir.

[0005] In a first aspect, an embodiment of the present invention provides a method for quantitatively describing remaining gas in a gas reservoir, comprising:

[0006] Generate the productivity parameters of tight gas reservoirs according to the preset productivity equation;

[0007] Constructing a definition formula of the initial production and storage coefficient of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter;

[0008] Performing target parameter conversion on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula;

[0009] The physical property parameters of the tight gas reservoir are obtained, and a production and storage coefficient distribution map of the tight gas reservoir is generated according to the physical property parameters and the target production and storage coefficient definition formula.

[0010] According to an embodiment of the present invention, generating the productivity parameter of the tight gas reservoir according to a preset productivity equation includes:

[0011] The preset capacity equation is approximated to obtain an approximate equation of the capacity equation, wherein the preset capacity equation is:

[0012]

[0013] Among them, P r is the average pressure of the tight gas reservoir, P wf is the bottom hole flowing pressure of the tight gas reservoir, is the average viscosity of the gas in the tight gas reservoir, is the average compressibility coefficient of the gas in the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, q g is the production of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, t is the time, is the reservoir porosity of the tight gas reservoir, is the comprehensive compressibility coefficient of the tight gas reservoir, r w is the well conversion radius of the tight gas reservoir, S is the skin coefficient of the tight gas reservoir, D is the non-Darcy flow coefficient, lg(*) is a logarithmic function, c1, c2, c3, c4 are constant coefficients under a certain dimension;

[0014] The coefficient of the approximate equation is corrected to obtain a corrected equation of the approximate equation, and the production capacity parameter of the tight gas reservoir is generated using the corrected equation.

[0015] According to an embodiment of the present invention, the initial production and storage coefficient definition formula of the tight gas reservoir is constructed according to the production capacity parameter and the pre-acquired energy storage parameter, including:

[0016] The energy storage parameter of the tight gas reservoir is generated according to the energy storage factor obtained in advance, and the initial production and storage coefficient definition formula of the tight gas reservoir is generated according to the production capacity parameter and the energy storage parameter, wherein the initial production and storage coefficient definition formula is:

[0017]

[0018] Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, is the reservoir porosity of the tight gas reservoir, S g is the gas saturation of the tight gas reservoir.

[0019] According to an embodiment of the present invention, the target parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula, including:

[0020] Performing pressure parameter conversion on the initial production and reserve coefficient definition formula to obtain a first-level conversion definition formula of the initial production and reserve coefficient definition formula;

[0021] Performing reserve parameter conversion on the primary conversion definition formula to obtain a secondary conversion definition formula of the primary conversion definition formula;

[0022] Performing abundance parameter conversion on the secondary transformation definition formula to obtain a tertiary transformation definition formula of the secondary transformation definition formula;

[0023] The third-level conversion definition formula is subjected to compression parameter conversion to obtain a fourth-level conversion definition formula of the third-level conversion definition formula, and the fourth-level conversion definition formula is determined to be the target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula.

[0024] According to an embodiment of the present invention, the pressure parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a primary conversion definition formula of the initial production and reserve coefficient definition formula, including:

[0025] Determine the pressure parameter definition formula of the pressure parameter in the initial production and reserve coefficient definition formula, wherein the pressure parameter definition formula is:

[0026]

[0027] Among them, P r is the average pressure of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, B g is the volume compressibility factor of the tight gas reservoir;

[0028] Substituting the pressure parameter definition formula into the initial production and reserve coefficient definition formula, a first-order conversion definition formula of the initial production and reserve coefficient definition formula is obtained.

[0029] According to an embodiment of the present invention, the target parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula, including:

[0030] Obtaining a target parameter of the initial production and reserve coefficient definition formula, performing dimensionless processing on a pressure coefficient parameter in the target parameter, and obtaining a dimensionless pressure coefficient of the pressure coefficient parameter;

[0031] Performing dimensionless processing on a saturation coefficient parameter in the target parameter to obtain a dimensionless saturation coefficient of the saturation coefficient parameter;

[0032] The target parameter conversion is performed on the initial production and reserve coefficient definition formula according to the dimensionless pressure coefficient and the dimensionless saturation coefficient to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula.

[0033] In a second aspect, an embodiment of the present invention provides a device for quantitatively describing remaining gas in a gas reservoir, characterized by comprising:

[0034] A production capacity parameter generation module, used to generate the production capacity parameters of tight gas reservoirs according to a preset production capacity equation;

[0035] An initial production and storage coefficient definition module is used to construct an initial production and storage coefficient definition formula of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter;

[0036] A target parameter conversion module, used for performing target parameter conversion on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula;

[0037] The coefficient distribution diagram generation module is used to obtain the physical property parameters of the tight gas reservoir and generate the production and storage coefficient distribution diagram of the tight gas reservoir according to the physical property parameters and the target production and storage coefficient definition formula.

[0038] In a third aspect, an embodiment of the present invention provides an electronic device, comprising:

[0039] processor;

[0040] a memory for storing instructions executable by the processor;

[0041] Wherein, the processor is configured to execute the instructions to implement a method for quantitatively describing remaining gas in a gas reservoir as described in the first aspect.

[0042] In a fourth aspect, an embodiment of the present invention provides a medium having a computer program stored thereon, which, when executed by a processor, implements a method for quantitatively describing remaining gas in a gas reservoir as described in the first aspect.

[0043] Compared with the prior art, the above technical solution of the present invention has the following beneficial effects:

[0044] The embodiment of the present invention generates the production capacity parameters of the tight gas reservoir according to the preset production capacity equation, which is helpful to determine the relationship between the reservoir characteristics of the gas reservoir and the production capacity, and provides basic data for subsequent calculations. The initial production and storage coefficient definition formula comprehensively considers the two key parameters of production capacity and energy storage, and reflects the production and storage characteristics of the gas reservoir. By constructing this definition formula, the production and reserves can be linked to each other, so as to better describe the distribution of the remaining gas in the gas reservoir. On the basis of the initial production and storage coefficient definition formula, the target parameter conversion is performed to obtain the target production and storage coefficient definition formula, wherein the target production and storage coefficient definition formula comprehensively considers the influence of reservoir physical properties, thickness, porosity, gas saturation, and formation pressure parameters on the distribution of the remaining gas in the tight gas reservoir, avoids the limitations of traditional quantitative description methods, and can more accurately reflect the distribution of the remaining gas in the tight gas reservoir. Therefore, the quantitative description method, device, equipment, medium and program of the remaining gas in the gas reservoir proposed by the present invention can solve the problem of low accuracy of the quantitative description of the remaining gas in the gas reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only 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.

[0046] Figure 1 The flowchart of the method for quantitatively describing the remaining gas in a gas reservoir according to the first embodiment of the present invention is shown;

[0047] Figure 2 A data graph showing the average values ​​of physical property parameters related to sub-layers in a certain block of Example 1 of the present invention;

[0048] Figure 3 The distribution diagram of the production and storage coefficient of the L1 layer in Example 1 of the present invention is shown;

[0049] Figure 4 The distribution diagram of the production and storage coefficient of the L2 layer in Example 1 of the present invention is shown;

[0050] Figure 5 The distribution diagram of the production and storage coefficient of the L3 layer in Example 1 of the present invention is shown;

[0051] Figure 6 The distribution diagram of the production and storage coefficient of the L4 layer in Example 1 of the present invention is shown;

[0052] Figure 7The distribution diagram of the production and storage coefficient of the L5 layer in Example 1 of the present invention is shown;

[0053] Figure 8 The distribution diagram of the production and storage coefficient of the L6 layer in Example 1 of the present invention is shown;

[0054] Fig. 9 The dimensionless production-reservoir coefficient distribution diagram of the L1 layer in the second embodiment of the present invention is shown;

[0055] Fig.10 The dimensionless production-reservoir coefficient distribution diagram of the L2 layer in the second embodiment of the present invention is shown;

[0056] Fig.11 The dimensionless production-reservoir coefficient distribution diagram of the L3 layer in the second embodiment of the present invention is shown;

[0057] Fig.12 The dimensionless production-reservoir coefficient distribution diagram of the L4 layer in the second embodiment of the present invention is shown;

[0058] Fig.13 The dimensionless production-reservoir coefficient distribution diagram of the L5 layer in the second embodiment of the present invention is shown;

[0059] Fig.14 The dimensionless production-reservoir coefficient distribution diagram of the L6 layer in the second embodiment of the present invention is shown;

[0060] Fig.15 The functional module diagram of the device for quantitatively describing the remaining gas in a gas reservoir according to the third embodiment of the present invention is shown;

[0061] Fig.16 A schematic diagram of the composition structure of an electronic device for implementing the method for quantitatively describing the remaining gas in a gas reservoir according to the fourth embodiment of the present invention is shown. DETAILED DESCRIPTION

[0062] The present disclosure is further described below in conjunction with the embodiments shown in the accompanying drawings.

[0063] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0064] The present invention proposes a quantitative description method of the remaining gas in gas reservoirs based on numerical simulation technology. Based on the theory of compressible fluid dynamics and combined with the seepage model method, the seepage characteristics of the gas reservoir and the distribution of the remaining gas can be obtained by establishing the physical characteristics and seepage model of the gas reservoir, thereby more accurately estimating the distribution of the remaining gas. Compared with the traditional method, the quantitative description method of the remaining gas in gas reservoirs based on numerical simulation technology is more accurate, providing an accurate basis for adjusting the well deployment and tapping the potential of the remaining gas in the mid- and late-stage development of tight gas reservoirs, and has certain practical significance.

[0065] Embodiment 1

[0066] like Figure 1 As shown, the present invention proposes a method for quantitatively describing the remaining gas in a gas reservoir, comprising the following steps:

[0067] S1. Generate the production capacity parameters of the tight gas reservoir according to the preset production capacity equation.

[0068] In an embodiment of the present invention, generating the productivity parameter of the tight gas reservoir according to a preset productivity equation includes:

[0069] The preset capacity equation is approximated to obtain an approximate equation of the capacity equation, wherein the preset capacity equation is:

[0070]

[0071] Among them, P r is the average pressure of the tight gas reservoir, P wf is the bottom hole flowing pressure of the tight gas reservoir, is the average viscosity of the gas in the tight gas reservoir, is the average compressibility coefficient of the gas in the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, q g is the production of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, t is the time, is the reservoir porosity of the tight gas reservoir, is the comprehensive compressibility coefficient of the tight gas reservoir, r w is the well conversion radius of the tight gas reservoir, S is the skin coefficient of the tight gas reservoir, D is the non-Darcy flow coefficient, lg(*) is a logarithmic function, c1, c2, c3, c4 are constant coefficients under a certain dimension;

[0072] The coefficient of the approximate equation is corrected to obtain a corrected equation of the approximate equation, and the production capacity parameter of the tight gas reservoir is generated using the corrected equation.

[0073] In detail, the tight gas reservoir refers to a gas storage body formed by dense rocks underground. Normally, the porosity and permeability of dense rocks are relatively low, which cannot allow the gas to flow effectively, making it difficult to extract the gas through natural pressure or conventional drilling. The development of tight gas reservoirs has high technical difficulty and cost, but because of the rich natural gas resources contained, tight gas reservoirs have become an important field of energy development.

[0074] In detail, the preset capacity equation can be written as:

[0075]

[0076] Among them, P r is the average pressure of the tight gas reservoir, P wf is the bottom hole flowing pressure of the tight gas reservoir, is the average viscosity of the gas in the tight gas reservoir, is the average compressibility coefficient of the gas in the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, q g is the production of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, t is the time, is the reservoir porosity of the tight gas reservoir, is the comprehensive compressibility coefficient of the tight gas reservoir, r w is the well conversion radius of the tight gas reservoir, S is the skin coefficient of the tight gas reservoir, D is the non-Darcy flow coefficient, lg(*) is a logarithmic function, c1, c2, c3, c4 are constant coefficients under a certain dimension, A is the linear term coefficient, and B is the quadratic term coefficient.

[0077] Furthermore, the general quadratic coefficient B value of the tight low permeability gas reservoir and the bottom hole flowing pressure P of the tight gas reservoir are wf The value is very small, so the preset capacity equation can be approximated. The approximation can be to simplify or approximately replace certain items to simplify the equation form and reduce the calculation complexity, while retaining the accuracy and reliability of the equation as much as possible.

[0078] In detail, the coefficient correction of the approximate equation is because it has been determined that the gas well production is approximately proportional to the product of the square of the pressure and the permeability and the reservoir thickness, so the approximate equation can be corrected using the permeability and the reservoir thickness to obtain a corrected equation of the approximate equation, wherein the corrected equation is:

[0079]

[0080] Among them, q g is the production of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, A is the linear coefficient, P r is the average pressure of the tight gas reservoir.

[0081] Furthermore, the right side of the modified equation can be used to represent the production capacity parameter of the tight gas reservoir.

[0082] S2. Constructing a definition formula of the initial production and storage coefficient of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter.

[0083] In an embodiment of the present invention, the initial production and storage coefficient definition formula of the tight gas reservoir is constructed according to the production capacity parameter and the pre-acquired energy storage parameter, including:

[0084] The energy storage parameter of the tight gas reservoir is generated according to the energy storage factor obtained in advance, and the initial production and storage coefficient definition formula of the tight gas reservoir is generated according to the production capacity parameter and the energy storage parameter, wherein the initial production and storage coefficient definition formula is:

[0085]

[0086] Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, is the reservoir porosity of the tight gas reservoir, S g is the gas saturation of the tight gas reservoir.

[0087] In detail, the energy storage factors obtained in advance refer to the key formation parameters that characterize the size of gas reservoir reserves, which are the reservoir thickness, porosity and gas saturation of the tight gas reservoir, wherein the reservoir thickness refers to the vertical thickness of the reservoir, that is, the thickness of the rock layer occupied by the oil and gas reservoir. A larger reservoir thickness usually means a larger reservoir capacity and a higher reservoir productivity. The reservoir thickness can affect the exploreability and development potential of the reservoir. The porosity refers to the proportion of pore space in the reservoir, that is, the ratio of the pore volume to the total volume of the reservoir. The porosity reflects the ability of the reservoir to accommodate and store fluids (such as natural gas or oil). Higher porosity is usually beneficial to the effective reserves and productivity of the reservoir; the gas saturation refers to the ratio of the pore volume filled by natural gas in the reservoir to the total pore volume. The gas saturation reflects the natural gas content in the reservoir. A higher gas saturation usually means higher gas reserves.

[0088] In detail, the production-reservoir coefficient refers to the production capacity-storage capacity coefficient, which can be used to evaluate and predict the gas production capacity and gas storage potential of tight gas reservoirs.

[0089] In detail, in the definition formula of the initial production and storage coefficient, the reservoir permeability describes the ability of the reservoir rock to accommodate the flow of fluids. The higher the permeability, the stronger the flow ability of the fluid in the reservoir, which is beneficial to production capacity; the reservoir thickness describes the vertical thickness of the reservoir oil and gas layer. A larger thickness usually means a larger gas storage space, which is conducive to storing more gas; the average pressure describes the average pressure in the reservoir. The higher the pressure, the more likely the release and production of gas will increase; the reservoir porosity describes the proportion or volume of pores (voids) in the reservoir. The higher the porosity, the greater the storage gas holding capacity; the gas saturation describes the proportion of natural gas in the reservoir pores. The higher the gas saturation, the greater the amount of stored gas.

[0090] S3. Perform target parameter conversion on the initial production-reservoir coefficient definition formula to obtain a target production-reservoir coefficient definition formula of the initial production-reservoir coefficient definition formula.

[0091] In the embodiment of the present invention, the target parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula, including:

[0092] Performing pressure parameter conversion on the initial production and reserve coefficient definition formula to obtain a first-level conversion definition formula of the initial production and reserve coefficient definition formula;

[0093] Performing reserve parameter conversion on the primary conversion definition formula to obtain a secondary conversion definition formula of the primary conversion definition formula;

[0094] Performing abundance parameter conversion on the secondary transformation definition formula to obtain a tertiary transformation definition formula of the secondary transformation definition formula;

[0095] The third-level conversion definition formula is subjected to compression parameter conversion to obtain a fourth-level conversion definition formula of the third-level conversion definition formula, and the fourth-level conversion definition formula is determined to be the target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula.

[0096] In detail, the target parameter conversion refers to sequentially converting the initial production-reservoir coefficient definition formula into pressure parameter conversion, reserve parameter conversion, abundance parameter conversion and compression parameter conversion.

[0097] In detail, the pressure parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a first-level conversion definition formula of the initial production and reserve coefficient definition formula, including:

[0098] Determine the pressure parameter definition formula of the pressure parameter in the initial production and reserve coefficient definition formula, wherein the pressure parameter definition formula is:

[0099]

[0100] Among them, P ris the average pressure of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, B g is the volume compressibility factor of the tight gas reservoir;

[0101] Substituting the pressure parameter definition formula into the initial production and reserve coefficient definition formula, a first-order conversion definition formula of the initial production and reserve coefficient definition formula is obtained.

[0102] In detail, in the primary conversion definition, the pressure parameter has been partially converted through the pressure parameter definition, taking into account the effects of gas temperature, compressibility and volume compressibility on the production and storage coefficient, wherein the primary conversion definition is:

[0103]

[0104] Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, is the reservoir porosity of the tight gas reservoir, S g is the gas saturation of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, B g is the volume compression coefficient of the tight gas reservoir.

[0105] In detail, the volume compression coefficient B g It is a parameter that describes the volume change of gas under pressure change, which indicates the volume change ratio of gas under unit pressure change; the compression coefficient Z of gas in the tight gas reservoir under standard conditions is also called gas compression factor or gas expansion coefficient, which describes the volume change of gas under different pressure and temperature conditions.

[0106] In detail, the reserve parameter conversion of the primary conversion definition formula to obtain the secondary conversion definition formula of the primary conversion definition formula includes:

[0107] The reserve parameter conversion of the primary conversion definition formula is performed using the pre-acquired reserve definition formula to obtain a secondary conversion definition formula of the primary conversion definition formula, wherein the pre-acquired reserve definition formula is:

[0108]

[0109] Where, G is the reserves of the tight gas reservoir, B g is the volume compressibility factor of the tight gas reservoir, A s is the gas layer area of ​​the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, is the reservoir porosity of the tight gas reservoir, S g is the gas saturation of the tight gas reservoir.

[0110] In detail, the reserves G of the tight gas reservoir refers to the amount of recoverable natural gas contained in a specific area of ​​the reservoir rock, which is used to evaluate and describe the natural gas production capacity and economic potential.

[0111] In detail, when the gas layer area of ​​the tight gas reservoir is considered, the primary conversion definition can be written as:

[0112]

[0113] Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, is the reservoir porosity of the tight gas reservoir, S g is the gas saturation of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, B g is the volume compressibility factor of the tight gas reservoir, A s is the gas layer area of ​​the tight gas reservoir.

[0114] Furthermore, by substituting the pre-acquired reserve definition into the definition that takes the gas layer area into consideration, the secondary conversion definition of the primary conversion definition can be obtained, wherein the secondary conversion definition is:

[0115]

[0116] Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, A s is the gas layer area of ​​the tight gas reservoir, and G is the reserves of the tight gas reservoir.

[0117] In detail, the conversion of the secondary conversion definition formula into an abundance parameter to obtain the tertiary conversion definition formula of the secondary conversion definition formula refers to the conversion of the secondary conversion definition formula into an abundance parameter using the definition formula of reserve abundance, wherein the definition formula of reserve abundance is:

[0118] f=G / A s

[0119] Among them, A s is the gas layer area of ​​the tight gas reservoir, G is the reserves of the tight gas reservoir, and f is the reserve abundance of the tight gas reservoir.

[0120] In detail, the reserve abundance f refers to the reserve amount per unit area, which can also be understood as the amount of recoverable natural gas per unit area.

[0121] Furthermore, the definition of the reserve abundance is substituted into the secondary conversion definition to obtain the tertiary conversion definition of the secondary conversion definition, wherein the tertiary conversion definition is:

[0122]

[0123] Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, and f is the reserve abundance of the tight gas reservoir.

[0124] In detail, the compression parameter conversion of the third-level conversion definition formula to obtain the fourth-level conversion definition formula of the third-level conversion definition formula means firstly deforming the pressure parameter definition formula to obtain the volume compression coefficient representation formula of the pressure parameter definition formula, and then substituting the volume compression coefficient representation formula into the third-level conversion definition formula to obtain the fourth-level conversion definition formula of the third-level conversion definition formula, wherein the volume compression coefficient representation formula is:

[0125]

[0126] Among them, P r is the average pressure of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, B g is the volume compression coefficient of the tight gas reservoir.

[0127] Further, the target production and reserve coefficient definition formula of the fourth-level conversion definition formula is determined as the initial production and reserve coefficient definition formula, wherein the target production and reserve coefficient definition formula is:

[0128]

[0129] Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, f is the reserve abundance of the tight gas reservoir, B g is the volume compression coefficient of the tight gas reservoir.

[0130] S4. Acquire the physical property parameters of the tight gas reservoir, and generate a production and storage coefficient distribution map of the tight gas reservoir according to the physical property parameters and the target production and storage coefficient definition formula.

[0131] In the embodiment of the present invention, Figure 2 As shown, the physical property parameters include: reservoir permeability, thickness, average gas reservoir pressure, volume compression coefficient and reserve abundance. According to the physical property parameters, the production and reserve coefficient of the tight gas reservoir can be produced, wherein the unit of the reservoir permeability is millidacia (mD), the unit of the thickness is meter (m), the unit of the average gas reservoir pressure is megapascal (MPa), the volume compression coefficient is expressed in decimals, and the unit of the reserve abundance is cubic meter / square meter (m 3 / m 2), for example: in the L1 layer of a certain block, when the reservoir permeability is 0.12mD, the thickness is 5.75m, the average gas reservoir pressure is 26.50MPa, the volume compression coefficient is 0.00461 and the reserve abundance is 110m 3 / m 2 When the production-reservoir coefficient of the L1 layer in a certain block is 245m 2 / d, where the unit of the production-reservoir coefficient is square meters / day, which represents the ratio of the amount of fluid produced from the reservoir per unit reservoir area to the unit time; in the L4 layer of a certain block, when the reservoir permeability is 0.29mD, the thickness is 1.84m, the average pressure of the gas reservoir is 25.80MPa, the volume compression coefficient is 0.00474 and the reserve abundance is 65m 3 / m 2 When the production-reservoir coefficient of the L4 layer in a certain block is 109m 2 / d, wherein a high production-reservoir coefficient indicates that the reservoir has a better production capacity, that is, it can produce more fluid per unit area, while a low production-reservoir coefficient indicates that the reservoir has a relatively low production capacity and the amount of fluid produced per unit area is relatively small.

[0132] In an embodiment of the present invention, generating a production-reservoir coefficient distribution map of the tight gas reservoir based on the physical property parameters and the target production-reservoir coefficient definition formula means substituting the physical property parameters into the target production-reservoir coefficient definition formula to obtain the production-reservoir coefficient of the tight gas reservoir, and using the production-reservoir coefficient to generate a production-reservoir coefficient distribution map of the tight gas reservoir.

[0133] In detail, the production and storage coefficient distribution diagram represents the value of the production and storage coefficient of the tight gas reservoir. Figure 3-Figure 8 As shown, wherein the Figure 3-Figure 8 It is used to represent the distribution diagram of production and storage coefficients of different layers. The target research areas of the tight gas reservoir are divided into: L1 layer, L2 layer, L3 layer, L4 layer, L5 layer and L6 layer. Different layers correspond to different physical parameters, thereby generating different production and storage coefficients.

[0134] Further, according to the Figure 2 The physical property parameters are used to generate a production and storage coefficient distribution map of the six layers in the target study area of ​​the tight gas reservoir. The darker the color of a certain area in the map, the greater the production and storage coefficient of the tight gas reservoir. At the same time, the darker area can be used as the preferred area for drilling.

[0135] Embodiment 2

[0136] In order to more clearly understand the present invention, a second embodiment is used below to further explain the situation when the initial production and storage coefficient definition formula is used to convert the target parameters, and the production and storage coefficient distribution map of the tight gas reservoir is generated according to the target production and storage coefficient definition formula generated by the conversion.

[0137] The present invention proposes a method for quantitatively describing the remaining gas in a gas reservoir, comprising the following steps:

[0138] S10. Generate production capacity parameters of the tight gas reservoir according to a preset production capacity equation.

[0139] In the embodiment of the present invention, the implementation step of generating the production capacity parameters of the tight gas reservoir according to the preset production capacity equation is the same as step S1 in the first embodiment, and will not be repeated here.

[0140] S20. Constructing a definition formula for the initial production and storage coefficient of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter.

[0141] In the embodiment of the present invention, the implementation step of constructing the definition formula of the initial production and storage coefficient of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter is the same as step S2 in the first embodiment, which will not be repeated here.

[0142] S30, performing target parameter conversion on the initial production-reservoir coefficient definition formula to obtain a target production-reservoir coefficient definition formula of the initial production-reservoir coefficient definition formula.

[0143] In the embodiment of the present invention, the target parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula, including:

[0144] Obtaining a target parameter of the initial production and reserve coefficient definition formula, performing dimensionless processing on a pressure coefficient parameter in the target parameter, and obtaining a dimensionless pressure coefficient of the pressure coefficient parameter;

[0145] Performing dimensionless processing on a saturation coefficient parameter in the target parameter to obtain a dimensionless saturation coefficient of the saturation coefficient parameter;

[0146] The target parameter conversion is performed on the initial production and reserve coefficient definition formula according to the dimensionless pressure coefficient and the dimensionless saturation coefficient to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula.

[0147] In detail, the dimensionless processing of the pressure coefficient parameter in the target parameter to obtain the dimensionless pressure coefficient of the pressure coefficient parameter includes:

[0148] The pressure coefficient parameter in the target parameter is dimensionally processed using the following pressure coefficient dimensionless formula to obtain the dimensionless pressure coefficient of the pressure coefficient parameter:

[0149]

[0150] Among them, P dis the pressure coefficient of the current position of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, P i is the initial pressure at the current location of the tight gas reservoir.

[0151] In detail, the dimensionless processing is performed on the saturation coefficient parameter in the target parameter to obtain the dimensionless saturation coefficient of the saturation coefficient parameter, including:

[0152] The saturation coefficient parameter in the target parameter is dimensionally processed using the following saturation coefficient dimensionless formula to obtain the dimensionless saturation coefficient of the saturation coefficient parameter:

[0153]

[0154] Among them, S gd is the saturation coefficient of the current position of the tight gas reservoir, S g is the gas saturation of the tight gas reservoir, S gi is the initial gas saturation of the current position of the tight gas reservoir.

[0155] In detail, the target parameter conversion is performed on the initial production and reserve coefficient definition formula according to the dimensionless pressure coefficient and the dimensionless saturation coefficient to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula, including:

[0156] Performing pressure parameter conversion on the initial production and reserve coefficient definition formula to obtain a first-level conversion definition formula of the initial production and reserve coefficient definition formula;

[0157] Performing reserve parameter conversion on the primary conversion definition formula to obtain a secondary conversion definition formula of the primary conversion definition formula;

[0158] Performing abundance parameter conversion on the secondary transformation definition formula to obtain a tertiary transformation definition formula of the secondary transformation definition formula;

[0159] Performing compression parameter conversion on the third-level conversion definition formula to obtain a fourth-level conversion definition formula of the third-level conversion definition formula;

[0160] The fourth-level conversion definition formula is dimensionally converted according to the dimensionless pressure coefficient and the dimensionless saturation coefficient to obtain a fifth-level conversion definition formula of the fourth-level conversion definition formula, and the fifth-level conversion definition formula is determined as the target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula.

[0161] In the embodiment of the present invention, the process of deriving the four-level conversion definition formula from the initial production and reserve coefficient definition formula is the same as the process of deriving the four-level conversion definition formula from the initial production and reserve coefficient definition formula in the first embodiment, which will not be described in detail here. At the same time, it can be seen from the process of deriving the four-level conversion definition formula from the initial production and reserve coefficient definition formula in the first embodiment that the gas saturation S of the tight gas reservoir is g The saturation coefficient S of the current location of the tight gas reservoir gd replacement relationship.

[0162] In detail, the dimensionless transformation of the fourth-level transformation definition formula according to the dimensionless pressure coefficient and the dimensionless saturation coefficient to obtain the fifth-level transformation definition formula of the fourth-level transformation definition formula refers to substituting the dimensionless pressure coefficient and the dimensionless saturation coefficient into the fourth-level transformation definition formula, wherein the dimensionless pressure coefficient is an effective factor for the average pressure P of the tight gas reservoir in the fourth-level transformation definition formula. r As can be seen from the process of deriving the definition of the initial production and storage coefficient to the fourth-level conversion definition in Example 1, the gas saturation S of the tight gas reservoir is g The saturation coefficient S of the current location of the tight gas reservoir gd Therefore, the initial gas saturation S of the current position of the tight gas reservoir can be gi The gas saturation definition of the fourth-level conversion is dimensionally processed.

[0163] Furthermore, the five-level transformation definition is:

[0164]

[0165] Where, ζ is the production and storage coefficient of the tight gas reservoir, P d is the pressure coefficient of the current position of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, f is the reserve abundance of the tight gas reservoir, B g is the volume compressibility coefficient of the tight gas reservoir, S gi is the initial gas saturation of the current position of the tight gas reservoir.

[0166] In the embodiment of the present invention, the pressure coefficient parameter and the saturation coefficient parameter in the target parameter are dimensionally non-transformed in order to eliminate the unit influence of the physical quantity and make the expression more concise and universal. Through the dimensionless treatment, each physical quantity can be converted into a dimensionless value (i.e., a value without a unit), so that physical quantities of different units can be compared and analyzed. At the same time, the comparison between different physical quantities usually involves the conversion and conversion of units, and the dimensionless treatment can eliminate the interference of units, making the comparison between different quantities more convenient and direct.

[0167] S40, obtaining the physical property parameters of the tight gas reservoir, and generating a production and storage coefficient distribution map of the tight gas reservoir according to the physical property parameters and the target production and storage coefficient definition formula.

[0168] In an embodiment of the present invention, the physical parameters of the tight gas reservoir include: the production and storage coefficient of the tight gas reservoir, the pressure coefficient of the current position of the tight gas reservoir, the reservoir permeability of the tight gas reservoir, the reservoir thickness of the tight gas reservoir, the reserve abundance of the tight gas reservoir, the volume compression coefficient of the tight gas reservoir and the initial gas saturation of the current position of the tight gas reservoir.

[0169] In detail, the production and storage coefficient of the tight gas reservoir can be obtained by substituting the physical property parameters into the target production and storage coefficient definition formula. Figure 9-Figure 14 As shown, wherein the Figure 9-Figure 14 It is used to represent the dimensionless production and storage coefficient distribution diagram of different layers. The target research area of ​​the tight gas reservoir is divided into: L1 layer, L2 layer, L3 layer, L4 layer, L5 layer and L6 layer. Different layers correspond to different physical parameters, thereby generating different production and storage coefficients.

[0170] Furthermore, a production-reservoir coefficient distribution map of the six layers in the target study area of ​​the tight gas reservoir is generated according to the production-reservoir coefficient of the tight gas reservoir, wherein the production-reservoir coefficient distribution map refers to a dimensionless production-reservoir coefficient distribution map of the L1 layer, the L2 layer, the L3 layer, the L4 layer, the L5 layer and the L6 layer, which characterizes the size of the production-reservoir coefficient value of the tight gas reservoir. The darker the color of a certain area in the figure, the larger the production-reservoir coefficient of the tight gas reservoir. At the same time, the darker the color of the area can be used as the preferred area for drilling.

[0171] Embodiment 3

[0172] like Fig.15 As shown, this embodiment also provides a functional module diagram of a device for quantitatively describing remaining gas in a gas reservoir.

[0173] The gas reservoir remaining gas quantitative description device 100 described in this embodiment can be installed in an electronic device. According to the functions to be implemented, the gas reservoir remaining gas quantitative description device 100 may include a production capacity parameter generation module 101, an initial production and storage coefficient definition module 102, a target parameter conversion module 103 and a coefficient distribution map generation module 104. The module described in the present invention can also be called a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0174] In this embodiment, the functions of each module / unit are as follows:

[0175] The productivity parameter generating module 101 is used to generate productivity parameters of tight gas reservoirs according to a preset productivity equation;

[0176] The initial production and storage coefficient definition module 102 is used to construct the initial production and storage coefficient definition formula of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter;

[0177] The target parameter conversion module 103 is used to perform target parameter conversion on the initial production and storage coefficient definition formula to obtain a target production and storage coefficient definition formula of the initial production and storage coefficient definition formula;

[0178] The coefficient distribution diagram generating module 104 is used to obtain the physical property parameters of the tight gas reservoir, and generate the production and storage coefficient distribution diagram of the tight gas reservoir according to the physical property parameters and the target production and storage coefficient definition formula.

[0179] In detail, each module described in the gas reservoir remaining gas quantitative description device 100 described in the embodiment of the present invention adopts the same technical means as the gas reservoir remaining gas quantitative description method described in Example 1 and Example 2 when used, and can produce the same technical effect, which will not be repeated here.

[0180] Embodiment 4

[0181] like Fig.16 As shown, this embodiment also provides a computer electronic device, which may include a processor 10, a memory 11, a communication bus 12 and a communication interface 13, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a gas reservoir remaining gas quantitative description program.

[0182] In some embodiments, the processor 10 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips. The processor 10 is the control core (ControlUnit) of the electronic device, and uses various interfaces and lines to connect various components of the entire electronic device, and executes or executes programs or modules stored in the memory 11 (for example, executing a quantitative description program for the remaining gas in a gas reservoir, etc.), and calls data stored in the memory 11 to execute various functions of the electronic device and process data.

[0183] The memory 11 includes at least one type of medium, including flash memory, mobile hard disk, multimedia card, card-type memory (for example: SD or DX memory, etc.), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 11 can be an internal storage unit of an electronic device, such as a mobile hard disk of the electronic device. In other embodiments, the memory 11 can also be an external storage device of the electronic device, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device. Further, the memory 11 can also include both an internal storage unit of the electronic device and an external storage device. The memory 11 can not only be used to store application software and various types of data installed in the electronic device, such as the code of the quantitative description program of the remaining gas in the gas reservoir, but also can be used to temporarily store data that has been output or is to be output.

[0184] The communication bus 12 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The bus is configured to realize connection and communication between the memory 11 and at least one processor 10, etc.

[0185] The communication interface 13 is used for communication between the above-mentioned electronic device and other electronic devices, including a network interface and a user interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device and other electronic devices. The user interface may be a display (Display), an input unit (such as a keyboard (Keyboard)), and optionally, the user interface may also be a standard wired interface, a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode, organic light-emitting diode) touch device, etc. Among them, the display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device and to display a visual user interface.

[0186] The figure only shows an electronic device with components. Those skilled in the art will understand that the structure shown in the figure does not constitute a limitation on the electronic device, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0187] For example, although not shown, the electronic device may also include a power source (such as a battery) for supplying power to each component. Preferably, the power source may be logically connected to the at least one processor 10 through a power management device, so that the power management device can realize functions such as charging management, discharging management, and power consumption management. The power source may also include one or more DC or AC power sources, recharging devices, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components. The electronic device may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0188] It should be understood that the embodiment is for illustration only and the scope of the patent application is not limited to this structure.

[0189] The gas reservoir remaining gas quantitative description program stored in the memory 11 in the electronic device is a combination of multiple instructions. When running in the processor 10, it can achieve:

[0190] Generate the productivity parameters of tight gas reservoirs according to the preset productivity equation;

[0191] Constructing a definition formula of the initial production and storage coefficient of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter;

[0192] Performing target parameter conversion on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula;

[0193] The physical property parameters of the tight gas reservoir are obtained, and a production and storage coefficient distribution map of the tight gas reservoir is generated according to the physical property parameters and the target production and storage coefficient definition formula.

[0194] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to the description of the relevant steps in the corresponding embodiment of the accompanying drawings, which will not be repeated here.

[0195] Furthermore, if the module / unit integrated in the electronic device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a medium. The medium can be volatile or non-volatile. For example, the medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0196] Embodiment 5

[0197] This embodiment provides a medium storing a computer program. When the computer program is executed by a processor, the steps of the method for quantitatively describing remaining gas in a gas reservoir as described above are implemented.

[0198] These program codes can also be loaded onto a computer or other programmable data processing device so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions executed on the computer or other programmable device for implementing the process. Figure 1 The steps of a specified function in a process or multiple processes.

[0199] The medium includes permanent and non-permanent, removable and non-removable media, and can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, modules of programs or other data. Examples of media can 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 disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0200] Embodiment 6

[0201] An embodiment of the present invention provides a computer program, which, when executed by a processor, implements the steps of quantitative description of remaining gas in a gas reservoir as described in the first aspect.

[0202] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer programs can also be stored in a medium, and these computer programs make the computer, programmable data processing device and / or other equipment work in a specific way, so that the medium storing the computer program includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0203] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. When the terms "include" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0204] It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or described herein.

[0205] In the several embodiments provided by the present invention, it should be understood that the disclosed electronic device, apparatus and method can be implemented in other ways. For example, the apparatus embodiment described above is only illustrative, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation.

[0206] The modules described as separate components may or may not be physically separated, and the components shown as modules 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 modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0207] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, 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 hardware plus software functional modules.

[0208] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0209] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, so it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any attached figure mark in the claims should not be regarded as limiting the claims involved.

[0210] The embodiments of the present application can acquire and process relevant data based on artificial intelligence technology. Among them, artificial intelligence (AI) is the theory, method, technology and application system that uses digital computers or machines controlled by digital computers to simulate, extend and expand human intelligence, perceive the environment, acquire knowledge and use knowledge to obtain the best results.

[0211] In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system claim can also be implemented by one unit or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for quantitatively describing remaining gas in a gas reservoir, characterized in that: The method comprises: Generate the productivity parameters of tight gas reservoirs according to the preset productivity equation; Constructing a definition formula of the initial production and storage coefficient of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter; Performing target parameter conversion on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula; The physical property parameters of the tight gas reservoir are obtained, and a production and storage coefficient distribution map of the tight gas reservoir is generated according to the physical property parameters and the target production and storage coefficient definition formula.

2. The method for quantitatively describing the remaining gas in a gas reservoir according to claim 1, characterized in that: The generation of the productivity parameters of the tight gas reservoir according to the preset productivity equation includes: The preset capacity equation is approximated to obtain an approximate equation of the capacity equation, wherein the preset capacity equation is: Among them, P r is the average pressure of the tight gas reservoir, P wf is the bottom hole flowing pressure of the tight gas reservoir, is the average viscosity of the gas in the tight gas reservoir, is the average compressibility coefficient of the gas in the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, q g is the production of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, t is the time, is the reservoir porosity of the tight gas reservoir, is the comprehensive compressibility coefficient of the tight gas reservoir, r w is the well conversion radius of the tight gas reservoir, S is the skin coefficient of the tight gas reservoir, D is the non-Darcy flow coefficient, lg(*) is a logarithmic function, c1, c2, c3, c4 are constant coefficients under a certain dimension; The coefficient of the approximate equation is corrected to obtain a corrected equation of the approximate equation, and the production capacity parameter of the tight gas reservoir is generated using the corrected equation.

3. The method for quantitatively describing the remaining gas in a gas reservoir according to claim 1, characterized in that: The initial production and storage coefficient definition formula of the tight gas reservoir is constructed according to the production capacity parameter and the pre-acquired energy storage parameter, including: The energy storage parameter of the tight gas reservoir is generated according to the energy storage factor obtained in advance, and the initial production and storage coefficient definition formula of the tight gas reservoir is generated according to the production capacity parameter and the energy storage parameter, wherein the initial production and storage coefficient definition formula is: Where, ζ is the production and storage coefficient of the tight gas reservoir, P r is the average pressure of the tight gas reservoir, k is the reservoir permeability of the tight gas reservoir, h is the reservoir thickness of the tight gas reservoir, is the reservoir porosity of the tight gas reservoir, S g is the gas saturation of the tight gas reservoir.

4. The method for quantitatively describing the remaining gas in a gas reservoir according to claim 1, characterized in that: The target parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula, including: Performing pressure parameter conversion on the initial production and reserve coefficient definition formula to obtain a first-level conversion definition formula of the initial production and reserve coefficient definition formula; Performing reserve parameter conversion on the primary conversion definition formula to obtain a secondary conversion definition formula of the primary conversion definition formula; Performing abundance parameter conversion on the secondary transformation definition formula to obtain a tertiary transformation definition formula of the secondary transformation definition formula; The third-level conversion definition formula is subjected to compression parameter conversion to obtain a fourth-level conversion definition formula of the third-level conversion definition formula, and the fourth-level conversion definition formula is determined to be the target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula.

5. The method for quantitatively describing the remaining gas in a gas reservoir according to claim 4, characterized in that: The pressure parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a primary conversion definition formula of the initial production and reserve coefficient definition formula, including: Determine the pressure parameter definition formula of the pressure parameter in the initial production and reserve coefficient definition formula, wherein the pressure parameter definition formula is: Among them, P r is the average pressure of the tight gas reservoir, T is the reservoir temperature of the tight gas reservoir, P SC is the pressure of the gas in the tight gas reservoir under standard conditions, Z is the compressibility coefficient of the gas in the tight gas reservoir under average pressure, and Z SC is the compressibility coefficient of the gas in the tight gas reservoir under standard conditions, T SC is the temperature of the gas in the tight gas reservoir under standard conditions, B g is the volume compressibility factor of the tight gas reservoir; Substituting the pressure parameter definition formula into the initial production and reserve coefficient definition formula, a first-order conversion definition formula of the initial production and reserve coefficient definition formula is obtained.

6. The method for quantitatively describing the remaining gas in a gas reservoir according to claim 1, characterized in that: The target parameter conversion is performed on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula, including: Obtaining a target parameter of the initial production and reserve coefficient definition formula, performing dimensionless processing on a pressure coefficient parameter in the target parameter, and obtaining a dimensionless pressure coefficient of the pressure coefficient parameter; Performing dimensionless processing on a saturation coefficient parameter in the target parameter to obtain a dimensionless saturation coefficient of the saturation coefficient parameter; The target parameter conversion is performed on the initial production and reserve coefficient definition formula according to the dimensionless pressure coefficient and the dimensionless saturation coefficient to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula.

7. A device for quantitatively describing the remaining gas in a gas reservoir, characterized in that: The device comprises: A production capacity parameter generation module, used to generate the production capacity parameters of tight gas reservoirs according to a preset production capacity equation; An initial production and storage coefficient definition module is used to construct an initial production and storage coefficient definition formula of the tight gas reservoir according to the production capacity parameter and the pre-acquired energy storage parameter; A target parameter conversion module, used for performing target parameter conversion on the initial production and reserve coefficient definition formula to obtain a target production and reserve coefficient definition formula of the initial production and reserve coefficient definition formula; The coefficient distribution diagram generation module is used to obtain the physical property parameters of the tight gas reservoir and generate the production and storage coefficient distribution diagram of the tight gas reservoir according to the physical property parameters and the target production and storage coefficient definition formula.

8. An electronic device, comprising: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method for quantitatively describing remaining gas in a gas reservoir as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the program is executed by a processor, the method for quantitatively describing the remaining gas in a gas reservoir as claimed in any one of claims 1 to 6 is implemented.

10. A computer program, characterized in that When the program is executed by a processor, the method for quantitatively describing the remaining gas in a gas reservoir as claimed in any one of claims 1 to 6 is implemented.

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