Method and device for determining production scale of heterogeneous gas reservoir

Abstract

The application provides a method and device for determining the scale of a non-homogeneous gas reservoir, and the method comprises the following steps: classifying gas wells of the non-homogeneous gas reservoir; determining the reasonable yield of each gas well type according to a fitting relationship between the reasonable yield and the open flow capacity of each gas well type; determining the distribution range of each gas well type and the average single-well control radius corresponding to the gas well type; and determining the scale of the non-homogeneous gas reservoir according to the reasonable yield, the distribution range and the average single-well control radius of each gas well type. The application can determine the scale of the gas reservoir according to different types of gas wells, improve the prediction accuracy of the scale of the gas reservoir, effectively guide the development decision of the non-homogeneous gas reservoir and improve the development efficiency of the non-homogeneous gas reservoir.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas reservoir development, in particular to a method and device for determining the scale of a heterogeneous gas reservoir. BACKGROUND

[0002] For a strong heterogeneous gas reservoir, the reservoir space includes pores, fractures and caves, and the reservoir space is multi-scale. The reservoir and permeation medium is abnormally complex and is affected by macroscopic and microscopic heterogeneity of the reservoir. At the early stage of development, the gas reservoir is characterized by "one well, one reservoir". As the pressure gradually spreads outward, the gas reservoir is often characterized by multiple development zones (single permeation unit) at the middle and late stages of development. Therefore, the scale of the gas reservoir is different from that of the conventional method. According to the geological and development characteristics of the gas reservoir, the reasonable gas production rate of the gas reservoir is determined by comprehensively considering the scale of the gas field, the resource replacement condition, the stable production requirement, the economic benefit of the gas field development and the recovery rate. The specific requirements are as follows: (1) the relationship between the gas production rate, the stable production period and the recovery degree during the stable production period is studied by using the numerical simulation method. The development indexes of the gas reservoir under different gas production rates are predicted and compared, and the reasonable gas production rate is optimized. (2) The stable production period of a large-scale high-permeability gas field is 10-15 years, and a gas production rate of 3-4% is generally used. A small-scale gas field with good reservoir properties and connectivity requires a stable production period of 7-10 years, and a gas production rate of 4-5% can be used. The gas production rate of a low-permeability low-abundance gas field and a water-driven gas reservoir is generally less than 3%. The gas production rate of a high-acidity gas field can be appropriately increased. (3) If the resource replacement condition of the gas field development is good and the storage-production ratio of the gas supply area is more than 20, a higher gas production rate can be used under the condition that the recovery rate is not affected.

[0003] In the existing method, the numerical simulation method is commonly used to predict the development indexes of the gas reservoir under different gas production rates, and to optimize the reasonable gas production rate, so as to determine the scale of the gas reservoir. However, this method is greatly affected by the data accuracy and human factors. At the early stage of the gas reservoir development, various dynamic and static data are less, and the accuracy of the established geological model is low. In the case of less dynamic data, the fitting and parameter adjustment are greatly affected by human factors, and therefore the simulation result has low reliability. Another method is to use the empirical method, that is, different gas production rates are used for different types of gas reservoirs to determine the development scale of the gas reservoir. This method is feasible for conventional gas reservoirs with low heterogeneity. However, for a strong heterogeneous gas reservoir, on the one hand, the evaluation of the available reserves has a large error, and on the other hand, the scale of the gas reservoir is determined according to a certain gas production rate, and then the number of drilled wells is determined, and the well pattern is formed at one time. Some development wells will be abandoned or low-yield wells, and there is a certain development risk.

[0004] Therefore, the existing method has the problems of great human influence and high requirement for dynamic and static data, and it is difficult to accurately evaluate the development scale of the gas reservoir. SUMMARY

[0005] In order to solve the problems in the prior art, the application provides a method and device for determining a production scale of a heterogeneous gas reservoir, which can improve the prediction accuracy of the production scale and improve the development efficiency of the heterogeneous gas reservoir.

[0006] To solve the above technical problems, the application provides the following technical solutions.

[0007] In a first aspect, the application provides a method for determining a production scale of a heterogeneous gas reservoir, comprising:

[0008] dividing the gas wells of the heterogeneous gas reservoir into different types;

[0009] determining a reasonable production of each gas well type according to a fitting relationship between the reasonable production and the open flow capacity of each gas well type;

[0010] determining the distribution range of each gas well type and the average single-well control radius corresponding to the gas well type;

[0011] determining the production scale of the heterogeneous gas reservoir according to the reasonable production, the distribution range and the average single-well control radius of each gas well type.

[0012] The method for dividing the gas wells of the heterogeneous gas reservoir into different types comprises:

[0013] calculating the open flow capacity and the dynamic reserves of the gas wells of the heterogeneous gas reservoir;

[0014] determining the initial test production of the gas wells according to the open flow capacity;

[0015] determining the linear relationship between the initial test production and the dynamic reserves of the gas wells in the double logarithmic coordinates;

[0016] dividing the gas well types of the heterogeneous gas reservoir according to the linear relationship.

[0017] The method for determining the reasonable production of each gas well type according to the fitting relationship between the reasonable production and the open flow capacity of each gas well type comprises:

[0018] determining a first fitting relationship between the dynamic reserves of each gas well type and a preset production allocation ratio, and a second fitting relationship between the dynamic reserves and the open flow capacity; wherein the production allocation ratio is the ratio between the reasonable production and the open flow capacity;

[0019] determining the fitting relationship between the reasonable production and the open flow capacity according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the fitting relationship is used to determine the reasonable production of the gas wells of the heterogeneous gas reservoir.

[0020] The determining the build-up scale of the heterogeneous gas reservoir according to the reasonable production of each gas well type, the distribution range and the average single-well control radius comprises:

[0021] The number of wells in each gas well type is determined according to the distribution range and the average single-well control radius of each gas well type.

[0022] The build-up scale of the gas reservoir of each gas well type is determined according to the reasonable production of each gas well type and the number of wells; and the build-up scales of all the gas well types constitute the build-up scale of the heterogeneous gas reservoir.

[0023] In the second aspect, the application provides a device for determining the build-up scale of a heterogeneous gas reservoir, which comprises:

[0024] A gas well classification unit is configured to classify the gas wells of the heterogeneous gas reservoir into different types.

[0025] A gas well reasonable production unit is configured to determine the reasonable production of each gas well type according to a fitting relationship between the reasonable production and the open flow capacity of each gas well type.

[0026] An acquisition unit is configured to determine the distribution range of each gas well type and the average single-well control radius corresponding to the gas well type.

[0027] A build-up scale unit is configured to determine the build-up scale of the heterogeneous gas reservoir according to the reasonable production of each gas well type, the distribution range and the average single-well control radius.

[0028] The gas well classification unit comprises:

[0029] A calculation module is configured to calculate the open flow capacity and the dynamic reserves of the gas well of the heterogeneous gas reservoir.

[0030] A test module is configured to determine the initial test production of the gas well according to the open flow capacity.

[0031] A linear module is configured to determine the linear relationship between the initial test production and the dynamic reserves of the gas well in the double logarithmic coordinates.

[0032] A classification module is configured to classify the gas well types of the heterogeneous gas reservoir according to the linear relationship.

[0033] The gas well reasonable production unit comprises:

[0034] A fitting module is configured to determine a first fitting relationship between the dynamic reserves and a preset production allocation ratio of each gas well type, and a second fitting relationship between the dynamic reserves and the open flow capacity; wherein the production allocation ratio is the ratio between the reasonable production and the open flow capacity.

[0035] a yield module configured to determine a fitting relationship between the reasonable yield and the open flow capacity of each gas well type according to the first fitting relationship and the second fitting relationship corresponding to the respective gas well type, wherein the fitting relationship is used to determine the reasonable yield of the gas well in the heterogeneous gas reservoir.

[0036] The build-up scale unit comprises:

[0037] A well number calculation module is configured to determine the number of wells in each gas well type according to the distribution range and the average single-well control radius of each gas well type.

[0038] A scale calculation module is configured to determine the build-up scale of the gas reservoir of each gas well type according to the reasonable yield of the gas well and the number of wells in the gas well type, wherein the build-up scales of all the gas well types constitute the build-up scale of the heterogeneous gas reservoir.

[0039] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for determining the build-up scale of the heterogeneous gas reservoir.

[0040] In a fourth aspect, the present application provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executable on a processor to implement the steps of the method for determining the build-up scale of the heterogeneous gas reservoir.

[0041] According to the above technical solution, the present application provides a method and device for determining the build-up scale of the heterogeneous gas reservoir, which divides the gas wells in the heterogeneous gas reservoir into different types, determines the reasonable yield of each gas well type according to the fitting relationship between the reasonable yield and the open flow capacity of each gas well type, determines the distribution range of each gas well type and the average single-well control radius corresponding to the gas well type, and determines the build-up scale of the heterogeneous gas reservoir according to the reasonable yield, the distribution range, and the average single-well control radius of each gas well type. The build-up scale of the gas reservoir can be determined according to different types of gas wells, the prediction accuracy of the build-up scale is improved, the development decision of the heterogeneous gas reservoir can be effectively guided, and the development efficiency of the heterogeneous gas reservoir is improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0043] Figure 1A flowchart of the method for determining the scale of a heterogeneous gas reservoir in the embodiment of the present application.

[0044] Figure 2 A crossplot of open flow capacity and dynamic reserves of a completed gas well in the embodiment of the present application.

[0045] Figure 3 A conventional gas well type classification chart in the prior art.

[0046] Figure 4 A flowchart of step S101 in the method for determining the scale of a heterogeneous gas reservoir in the embodiment of the present application.

[0047] Figure 5 A flowchart of step S102 in the method for determining the scale of a heterogeneous gas reservoir in the embodiment of the present application.

[0048] Figure 6 A gas well type classification chart in the method for determining the scale of a heterogeneous gas reservoir in the embodiment of the present application.

[0049] Figure 7 A production allocation and open flow capacity ratio and dynamic reserve relationship fitting curve in the method for determining the scale of a heterogeneous gas reservoir in the embodiment of the present application.

[0050] Figure 8 A structural diagram of the device for determining the scale of a heterogeneous gas reservoir in the embodiment of the present application.

[0051] Figure 9 A structural diagram of the electronic device in the embodiment of the present application. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0053] The present application provides an embodiment of a method for determining the scale of a heterogeneous gas reservoir, referring to Figure 1 , the method for determining the scale of a heterogeneous gas reservoir specifically comprises the following contents:

[0054] S101: classifying the gas well types of the gas well of a heterogeneous gas reservoir;

[0055] For strong heterogeneous gas reservoir, the initial test production of gas well and the long-term stable production capacity of gas well do not match completely. Influenced by strong reservoir development heterogeneity and acid fracturing technology, the completed gas well in the gas reservoir shows high initial production, but poor long-term stable production capacity, or low initial production, but has a long stable production period under the condition of low production allocation. Figure 2 For strong heterogeneous gas reservoir, the initial open flow capacity of gas well and the dynamic reserves are highly differentiated. See Figure 3 For this type of gas reservoir, the conventional method of gas well classification is to determine the high production (open flow capacity) and stable production (dynamic reserves) standards of gas well by combining the actual production and the overall data of completed well, and to divide the gas well into four types: type I well (high test high dynamic reserves), type II well (low test high dynamic reserves), type III well (high test low dynamic reserves) and type IV well (low test low dynamic reserves). This classification method lacks comprehensive consideration of the characteristics of underground geological body, acid fracturing technology and dynamic characteristics of gas well, and only mechanically classifies the type of gas well, which lacks practical guiding significance for scientific and efficient development of gas field.

[0056] In this step, based on the calculation results of open flow capacity and dynamic reserves of gas well, the intersection plot of open flow capacity and dynamic reserves of development well shows different zoning characteristics due to the difference in macroscopic seepage characteristics between different blocks in the same gas reservoir. In a single zone, the sample points can be fitted into a straight line. The more complex the gas reservoir, the more zoning characteristics the intersection plot of open flow capacity and dynamic reserves of development well shows. The gas wells in different regions are divided into one type of gas well. This classification method considers the geological characteristics, completed well type, acid fracturing technology and other measures in the block. The type of gas well is the result of the comprehensive action of geological conditions and technological measures of development well, which can better scientifically manage the development index, production system and development countermeasures of gas well, so as to realize efficient development from gas well to gas reservoir.

[0057] It should be noted that this embodiment is based on the difference in seepage characteristics to classify the completed development well. The most direct application scenario is to regard the seemingly isolated development well as an organic whole, scientifically evaluate the production capacity of gas well by combining geological conditions and technological measures, and realize the matching of high production capacity and stable production capacity of development well by mouth, so as to avoid unreasonable classification of gas well type, resulting in early high production (high open flow capacity) of some gas wells, rapid decline after a period of production, lack of reasonable production capacity scale basis for medium and long-term stable production capacity, and even rapid water invasion of edge and bottom water for water gas reservoir, which greatly reduces the recovery efficiency of gas reservoir.

[0058] S102: Determine the reasonable production capacity of each gas well type according to the fitting relationship between the reasonable production capacity and the open flow capacity of each gas well type;

[0059] In this step, the reasonable production of each gas well type is determined, and the relationship between the reasonable production and the open flow capacity is established under the condition of stable production, so as to fit the mathematical relationship between the dynamic reserves and the ratio of the reasonable production to the open flow capacity. Based on the macroscopic percolation capacity of different types of gas wells, the macroscopic percolation characteristics of different types of gas wells under the condition of dynamic reserves are determined, and the production allocation proportion of different types of gas wells is determined, so that the fitting curve of the dynamic reserves and the production allocation proportion of different types of gas wells can be obtained. According to the relationship between the dynamic reserves and the open flow capacity of different types of gas wells, and the relationship between the dynamic reserves and the production allocation proportion, on this basis, the relationship between the reasonable production and the open flow capacity of different types of gas wells can be obtained through formula derivation, so as to determine the reasonable production of gas wells by type.

[0060] S103: Determine the distribution range of each gas well type and the average single well control radius corresponding to the gas well type;

[0061] In this step, the distribution range of each type of gas well in the gas reservoir range can be determined by combining geology and seismic, that is, the distribution area of each type of gas well. According to the well test data of different types of gas wells, the average single well control radius of different types of gas wells can be obtained.

[0062] S104: Determine the production scale of the heterogeneous gas reservoir according to the reasonable production of each gas well type, the distribution range and the average single well control radius.

[0063] Determine the number of wells in each gas well type according to the distribution range and the average single well control radius of each gas well type; determine the gas reservoir production scale of each gas well type according to the reasonable production of each gas well type and the number of wells; wherein the gas reservoir production scale of all gas well types constitutes the production scale of the heterogeneous gas reservoir.

[0064] For example: step S101 classifies the gas wells of the heterogeneous gas reservoir into type I and type II. In step S103, the distribution areas of type I and type II are S1 and S2 respectively. The average single well control radii of type I and type II are r1 and r2 respectively. Thus, the number of wells that can be arranged in type I and type II areas and In the formula, the INT() function is a down-rounding function.

[0065] After obtaining the number of wells in different areas, the production scale of the entire gas reservoir can be predicted according to the formula for calculating the reasonable production of a single well in step S102, and the reasonable production scale calculation formula of the gas reservoir is as follows:

[0066]

[0067] Wherein, Q i is the reasonable production of type I well (104m3 / d), n1 is the number of type I well, Q iQ is the reasonable yield of the type II well (104m3 / d), n2 is the number of type II wells, Q is the annual gas production scale of the gas reservoir (108m3 / a), and n is the number of gas wells in the gas reservoir. a Q is the annual gas production scale of the gas reservoir (108m3 / a), and n is the number of gas wells in the gas reservoir.

[0068] It should be noted that, in the middle and late development stages of the type I well area, a unified pressure drop system is formed in the entire development unit, and the ratio of static reserves to dynamic reserves in the unit and the dynamic reserve gas production rate of the unit are considered to appropriately adjust and reduce the single-well production allocation, so as to slow down the decline of the recovery rate caused by stress sensitivity or tongue advance of the edge and bottom water.

[0069] It can be known from the above description that the method for determining the production scale of the heterogeneous gas reservoir provided by the embodiment of the present application can divide the gas wells of the heterogeneous gas reservoir according to the type of the gas well, determine the reasonable yield of the gas well corresponding to each type of the gas well according to the fitting relationship between the reasonable yield and the open flow capacity of each type of the gas well, determine the distribution range of each type of the gas well and the average single-well control radius corresponding to the type of the gas well, and determine the production scale of the heterogeneous gas reservoir according to the reasonable yield of each type of the gas well, the distribution range and the average single-well control radius, so that the production scale of the gas reservoir can be determined according to different types of the gas well, the prediction accuracy of the production scale is improved, the development decision of the heterogeneous gas reservoir can be effectively guided, and the development efficiency of the heterogeneous gas reservoir is improved.

[0070] In an embodiment of the present application, a specific implementation of step S101 in the above embodiment is provided, and the specific implementation is described with reference to Figure 4 , and specifically includes:

[0071] S1011: calculating the open flow capacity and the dynamic reserves of the gas well of the heterogeneous gas reservoir;

[0072] S1012: determining the initial test yield of the gas well according to the open flow capacity;

[0073] S1013: determining the linear relationship between the initial test yield and the dynamic reserves of the gas well in the double logarithmic coordinates;

[0074] S1014: dividing the type of the gas well of the heterogeneous gas reservoir according to the linear relationship.

[0075] In the step S1014, the dividing the type of the gas well of the heterogeneous gas reservoir according to the linear relationship includes: based on the linear relationship, the gas wells meeting the same fitting curve are classified as the same type of gas well.

[0076] In the embodiment, in the specific gas well type division, the seismic data is applied to consider the seismic influence characteristics, the well logging data of the drilled well is applied to consider the geological body characteristics near the wellbore, the test data is applied to analyze the seepage characteristics around the wellbore, and the dynamic data is applied to analyze the macroscopic seepage characteristics of the drilled geological body of the whole gas well, so as to divide the gas well types, and the same type reservoir and permeable body is used under the conditions of the relative acid fracturing technology and the gas well type.

[0077] Further, when the gas well types of the heterogeneous gas reservoir are divided, the open flow capacity and the dynamic reserves of the gas well of the heterogeneous gas reservoir need to be calculated; the initial test production of the gas well is determined according to the open flow capacity. The linear relationship between the initial test production and the dynamic reserves of the gas well in the double logarithmic coordinates is determined; and the development well types of the heterogeneous gas reservoir are divided according to the linear relationship.

[0078] In the embodiment, the development wells meeting the same fitting curve are classified into the same type of gas well based on the linear relationship.

[0079] In the embodiment, the initial test production of the gas well drilled in the same type of reservoir and permeable body and the dynamic reserves of the gas well form a linear relationship in the double logarithmic coordinates, and according to the linear relationship, the gas well types can be divided, the sample points meeting the same fitting curve are classified into the same type of gas well, and the sample points not meeting the same fitting curve are classified into different types of gas well.

[0080] As can be seen from the above description, the embodiment of the gas well type division method of the heterogeneous gas reservoir can comprehensively and systematically evaluate the production capacity of the development well; the distribution range of the different types of development wells in the gas reservoir can be verified in combination with the geological characteristics of the gas reservoir, and generally, the same type of gas well has obvious zoning characteristics in the range of the gas reservoir; and thus the development benefit of the gas reservoir is improved, and the efficient development of the gas reservoir is realized.

[0081] In the embodiment of the present application, a specific implementation of step S102 in the above embodiment is provided, as shown in Figure 5 , and specifically includes:

[0082] S1021: determining a first fitting relationship between the dynamic reserves of each gas well type and a preset production allocation ratio, and a second fitting relationship between the dynamic reserves and the open flow capacity; wherein the production allocation ratio is the ratio between the reasonable production and the open flow capacity;

[0083] In this step, the first fitting relationship between the dynamic reserves of each gas well type and the preset production allocation ratio, and the second fitting relationship between the dynamic reserves and the open flow capacity need to be determined, and specifically include:

[0084] According to the respective dynamic reserves of each gas well type and the preset production allocation ratio, a curve relationship between the dynamic reserves and the production allocation ratio is determined as a first fitting relationship.

[0085] The corresponding relationship between the reasonable production and the open flow capacity of the gas well is determined based on the dynamic reserves of the completed gas well and the recovery factor of the gas reservoir under certain stable production conditions, so as to fit the mathematical relationship between the dynamic reserves and the ratio of the reasonable production to the open flow capacity. This method considers the macroscopic seepage capacity of different types of gas wells under certain dynamic reserves, considers the macroscopic seepage characteristics of different types of gas wells, and determines the production allocation ratio, so that the curve relationship between the dynamic reserves and the production allocation ratio of different types of gas wells can be obtained.

[0086] The linear relationship between the open flow capacity and the dynamic reserves of each gas well type in the log coordinate is determined as a second fitting relationship.

[0087] The open flow capacity and the dynamic reserves of the development well present different zoned characteristics in the intersection graph, and the sample points in a single zone can be fitted as a straight line. The more complex the gas reservoir is, the more zoned characteristics the intersection graph of the open flow capacity and the dynamic reserves of the development well presents. The gas wells in different regions are classified into one type of gas well. This classification method comprehensively considers the geological characteristics, completed well type, acid fracturing process measures and the like in the block. The gas well type is the result of the comprehensive action of the geological conditions and the process measures of the development well, and can better scientifically manage the development index, production system and development countermeasures of the gas well, so as to realize efficient development from the gas well to the gas reservoir.

[0088] S1022: determining a fitting relationship between the reasonable production and the open flow capacity according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the fitting relationship is used to determine the reasonable production of the gas well in the heterogeneous gas reservoir.

[0089] In this step, the relationship between the dynamic reserves and the open flow capacity of different types of gas wells and the relationship between the dynamic reserves and the production allocation ratio can be obtained through the above step S1021. On this basis, the third fitting relationship between the reasonable production and the open flow capacity of different types of gas wells can be obtained through formula derivation, so as to determine the reasonable production of the gas well by type.

[0090] The preset production allocation ratio is a field in the gas well development index statistical table, and the gas well development index statistical table is shown in Table 1.

[0091] Table 1: Gas well development index statistical table

[0092]

[0093]

[0094] From the above description, the method for determining the reasonable production of each gas well type provided by the embodiment of the application can comprehensively consider the high production capacity in the early stage and the stable production capacity in the long term, can more accurately evaluate the production capacity of the gas well, can avoid the mismatch between the high production capacity in the early stage and the stable production capacity in the long term, and can more accurately evaluate the reasonable production of the gas well and thus improve the development efficiency of the gas reservoir.

[0095] To further illustrate the present application, a specific example of the method for determining the production scale of a heterogeneous gas reservoir is provided, which specifically includes the following contents:

[0096] Taking a Sinian Dengfour Member gas reservoir in a certain basin as an example, the Sinian gas reservoir is a karst weathering crust type carbonate gas reservoir, the development of the effective reservoir is controlled by deposition and karst, and the development of the high-yield well is controlled by favorable sedimentary microfacies, favorable microtopography unit and microfracture development, and the gas reservoir has strong heterogeneity.

[0097] I. Classification of gas wells. The early classification mainly considers two parameters of open flow capacity and dynamic reserve, formulates high-yield standards (open flow capacity greater than 100×10 4 m 3 ) and stable production standards (open flow capacity greater than 10×10 8 m 3 ), and divides the development gas wells into type I wells (high-test high-dynamic reserve type), type II wells (low-test high-dynamic reserve type), type III wells (high-test low-dynamic reserve type) and type IV wells (low-test low-dynamic reserve type) (see Figure 3 ). The classification method only classifies the development wells mechanically according to the values of open flow capacity and dynamic reserve, without considering the geological characteristics of the gas reservoir.

[0098] By dividing the gas wells into different zones, the drilled gas wells of the Dengfour Member gas reservoir in Moxi are divided into two types, see Figure 6 , and the open flow capacity and dynamic reserve of the single type gas well show a linear relationship in the logarithmic coordinates. The type I well has developed matrix pores and fracture-cave, good lateral connectivity, high test production, good stable production condition and long stable production period; the type II well has relatively low dynamic reserve, poor stable production condition and short stable production period. Based on the classification method, the development indexes of the gas well can be scientifically demonstrated.

[0099] Type I well: log Gp=0.5552·log Q aof +0.53 (Formula One)

[0100] Type II well: log Gp=1.0677·log Q aof -1.3799 (Formula Two)

[0101] In the formula, Gp represents the dynamic reserves of the gas well (y in the figure), in billions of cubic meters; Q aof The unobstructed flow rate of the gas well (x in the figure) is 10,000 cubic meters per day.

[0102] II. Determining the Reasonable Production Rate of Gas Wells. First, determine the dynamic reserves (Gp) and production allocation ratio (reasonable production rate Q and unobstructed flow rate Q). aof Ratio (or ratio) relationship fitting. See also Figure 7 Based on the high production capacity and stable production capacity of gas wells, the production allocation ratio of gas wells within different dynamic reserve ranges is established (Table 1), thereby fitting the relationship curve between dynamic reserves and production allocation ratio (Formula 3 and Formula 4).

[0103] Class I well: Gp = 53.897 μ -1.376 (Formula 3)

[0104] Class II well: Gp = 0.1585 μ -0.183 (Formula 4)

[0105] In the formula, Gp represents the dynamic reserves of the gas well (y in the figure), in billions of cubic meters; Q aof The gas well's unobstructed flow rate is 10,000 cubic meters per day; μ represents the production ratio (x in the figure), and its magnitude is... Dimensionless quantity; Q is the reasonable output, in ten thousand cubic meters per day.

[0106] Based on step one, the relationship between dynamic storage and unobstructed flow is: log Gp = A·log Q aof +B,Gp represents dynamic reserves, Q aof For unobstructed flow, A and B are coefficients. The relationship between the production ratio and dynamic reserves obtained in step two is as follows: μ represents the production ratio, Gp represents dynamic reserves, and M and N are coefficients. Simultaneously, the production ratio... Therefore, it can be deduced that:

[0107]

[0108] In the formula, Q aof Let represent the unobstructed flow rate of the gas well (in ten thousand cubic meters per day); Q represent the optimal production rate (in ten thousand cubic meters per day); and A, B, M, and N are coefficients. From this, the relationship between the optimal production rate of a gas well and its unobstructed flow rate can be obtained. The formula differs for different types of gas wells.

[0109] For the Moxi Deng No. 4 gas reservoir, the formula for determining the reasonable production of Class I gas wells is:

[0110]

[0111] For the Moxi Deng No. 4 gas reservoir, the formula for determining the reasonable production of Class II gas wells is:

[0112]

[0113] For the four-section gas reservoir of Dengf, the reasonable production of gas wells can be determined by types (Table 2).

[0114] Table 2 Determination of reasonable production of gas wells

[0115]

[0116] III. The number of wells that can be distributed in the type I well area of the Sinian gas reservoir can be calculated as follows:

[0117]

[0118] The number of wells that can be distributed in the type II well area is:

[0119]

[0120] According to the average reasonable production of 14 wells in the type I well area, which is 300,000 cubic meters per day, and the average reasonable production of 28 wells in the type II well area, which is 104,000 cubic meters per day, the capacity scale of the Sinian Dengf section gas reservoir can be built as:

[0121] 100 million cubic meters per year.

[0122] Since there is no interwell interference in the type I well area at the initial stage of development, the production of single wells can be appropriately increased, and after all gas wells in the type I well area are put into production, the reasonable production of the whole well area is demonstrated.

[0123] The embodiment of the application provides a specific implementation of a non-homogeneous gas reservoir capacity scale determination device capable of realizing all contents of the non-homogeneous gas reservoir capacity scale determination method, which is described as follows: Figure 8 The non-homogeneous gas reservoir capacity scale determination device specifically includes the following contents:

[0124] A gas well division unit 10 is configured to divide gas wells of a non-homogeneous gas reservoir into different types;

[0125] A gas well reasonable production unit 20 is configured to determine the reasonable production of each type of gas well according to a fitting relationship between the reasonable production and the open flow capacity of each type of gas well;

[0126] An acquisition unit 30 is configured to determine the distribution range of each type of gas well and the average single-well control radius corresponding to the type of gas well;

[0127] A capacity scale unit 40 is configured to determine the capacity scale of the non-homogeneous gas reservoir according to the reasonable production of each type of gas well, the distribution range and the average single-well control radius.

[0128] The gas well division unit includes:

[0129] The computing module is configured to calculate the open flow capacity and the dynamic reserves of the gas well in the heterogeneous gas reservoir.

[0130] The testing module is configured to determine the initial test production of the gas well according to the open flow capacity.

[0131] The linear module is configured to determine the linear relationship between the initial test production and the dynamic reserves of the gas well in a double logarithmic coordinate.

[0132] The dividing module is configured to divide the types of the gas well in the heterogeneous gas reservoir according to the linear relationship.

[0133] The gas well reasonable production unit comprises:

[0134] The fitting module is configured to determine a first fitting relationship between the dynamic reserves of each type of the gas well and a preset production allocation ratio, and a second fitting relationship between the dynamic reserves and the open flow capacity; wherein the production allocation ratio is a ratio between the reasonable production and the open flow capacity.

[0135] The production module is configured to determine a fitting relationship between the reasonable production and the open flow capacity according to the first fitting relationship and the second fitting relationship corresponding to each type of the gas well; wherein the fitting relationship is used to determine the reasonable production of the gas well in the heterogeneous gas reservoir.

[0136] The well construction scale unit comprises:

[0137] The well number calculating module is configured to determine the well number in each type of the gas well according to the distribution range and the average single-well control radius of each type of the gas well.

[0138] The scale calculating module is configured to determine the gas reservoir construction scale of each type of the gas well according to the reasonable production of the gas well and the well number of each type of the gas well; wherein the gas reservoir construction scales of all types of the gas well constitute the gas reservoir construction scale of the heterogeneous gas reservoir.

[0139] The embodiment of the device for determining the gas reservoir construction scale of the heterogeneous gas reservoir provided by the application can be specifically used to execute the processing flow of the embodiment of the method for determining the gas reservoir construction scale of the heterogeneous gas reservoir in the above embodiment, and the function thereof will not be repeated here, and the detailed description of the above method embodiment can be referred to.

[0140] From the above description, the device for determining the scale of building production of the heterogeneous gas reservoir provided by the embodiment of the application can determine the reasonable production of the gas well corresponding to each gas well type according to the fitting relationship between the reasonable production and the open flow capacity of each gas well type, determine the distribution range of each gas well type and the average single-well control radius corresponding to the gas well type, and determine the scale of building production of the heterogeneous gas reservoir according to the reasonable production, the distribution range and the average single-well control radius of each gas well type. The scale of building production of the gas reservoir can be determined according to different types of gas wells, the prediction accuracy of the scale of building production is improved, the development decision of the heterogeneous gas reservoir can be effectively guided, and the development efficiency of the heterogeneous gas reservoir is improved.

[0141] The application provides an embodiment of an electronic device for implementing all or part of the contents of the method for determining the scale of building production of the heterogeneous gas reservoir, and the electronic device specifically includes the following contents:

[0142] A processor, a memory, a communications interface and a bus; wherein the processor, the memory and the communications interface complete mutual communication through the bus; the communications interface is used for realizing information transmission between related devices; the electronic device can be a desktop computer, a tablet computer, a mobile terminal and the like, and the embodiment is not limited thereto. In the embodiment, the electronic device can be implemented by referring to the embodiment of the method for determining the scale of building production of the heterogeneous gas reservoir and the embodiment of the device for determining the scale of building production of the heterogeneous gas reservoir, and the contents are incorporated herein, and details are not described herein again.

[0143] Figure 9 The schematic block diagram of the system structure of the electronic device 9600 of the embodiment of the application is shown in FIG. 9. As shown in the figure, the electronic device 9600 can include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that the structure shown in the figure is exemplary; other types of structures can also be used to supplement or replace the structure to realize the telecommunication function or other functions. Figure 9 Figure 9 The structure shown in the figure is exemplary; other types of structures can also be used to supplement or replace the structure to realize the telecommunication function or other functions.

[0144] In an embodiment, the function of determining the scale of building production of the heterogeneous gas reservoir can be integrated into the central processor 9100. The central processor 9100 can be configured to control as follows:

[0145] ​The non-homogeneous gas reservoir well type is divided, the reasonable yield of each gas well type is determined according to the fitting relationship between the reasonable yield and the open flow capacity of each gas well type, the distribution range of each gas well type and the corresponding average single well control radius of the gas well type are determined, and the non-homogeneous gas reservoir development scale is determined according to the reasonable yield, the distribution range and the average single well control radius of each gas well type, so that the non-homogeneous gas reservoir development scale can be determined according to different types of gas wells, the prediction accuracy of the development scale is improved, the development decision of the non-homogeneous gas reservoir can be effectively guided, and the development efficiency of the non-homogeneous gas reservoir is improved.

[0146] As can be seen from the above description, the electronic device provided by the embodiment of the application divides the non-homogeneous gas reservoir well type, determines the reasonable yield of each gas well type according to the fitting relationship between the reasonable yield and the open flow capacity of each gas well type, determines the distribution range of each gas well type and the corresponding average single well control radius of the gas well type, and determines the non-homogeneous gas reservoir development scale according to the reasonable yield, the distribution range and the average single well control radius of each gas well type, so that the non-homogeneous gas reservoir development scale can be determined according to different types of gas wells, the prediction accuracy of the development scale is improved, the development decision of the non-homogeneous gas reservoir can be effectively guided, and the development efficiency of the non-homogeneous gas reservoir is improved.

[0147] In another embodiment, the non-homogeneous gas reservoir development scale determination device can be configured separately from the central processor 9100, for example, the non-homogeneous gas reservoir development scale determination can be configured as a chip connected with the central processor 9100, and the non-homogeneous gas reservoir development scale determination function is realized through the control of the central processor.

[0148] As shown in FIG. 9, the electronic device 9600 can also include a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It should be noted that the electronic device 9600 does not necessarily include all the components shown in FIG. 9; in addition, the electronic device 9600 can also include components not shown in FIG. 9, which can be referred to prior art. Figure 9 Figure 9 As shown in FIG. 9, the electronic device 9600 can also include a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It should be noted that the electronic device 9600 does not necessarily include all the components shown in FIG. 9; in addition, the electronic device 9600 can also include components not shown in FIG. 9, which can be referred to prior art. Figure 9

[0149] As shown in FIG. 9, the electronic device 9600 can also include a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It should be noted that the electronic device 9600 does not necessarily include all the components shown in FIG. 9; in addition, the electronic device 9600 can also include components not shown in FIG. 9, which can be referred to prior art. Figure 9

[0150] ​​​The memory 9140, for example, can be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The above-mentioned information related to failure can be stored, and in addition, a program for executing the information related to failure can be stored. The central processing unit 9100 can execute the program stored in the memory 9140 to achieve information storage or processing, and the like.

[0151] The input unit 9120 provides input to the central processing unit 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to supply power to the electronic device 9600. The display 9160 is used to display display objects such as images and characters. The display can be, for example, an LCD display, but is not limited thereto.

[0152] The memory 9140 can be a solid state memory such as a read only memory (ROM), a random access memory (RAM), a SIM card, and the like. It can also be a memory that retains information even when power is off, can be selectively erased, and is provided with more data, and examples of such a memory are sometimes referred to as an EPROM, and the like. The memory 9140 can also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 can include an application / function storage section 9142 for storing application programs and function programs or for storing a flow for executing operations of the electronic device 9600 by the central processing unit 9100.

[0153] The memory 9140 can also include a data storage section 9143 for storing data such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. A driver storage section 9144 of the memory 9140 can include various drivers of the electronic device for a communication function and / or for executing other functions of the electronic device such as a messaging application, an address book application, and the like.

[0154] The communication module 9110 is a transmitter / receiver 9110 that transmits and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processing unit 9100 to provide input signals and receive output signals, which can be the same as in the case of a conventional mobile communication terminal.

[0155] Based on different communication technologies, multiple communication modules 9110, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module, etc., can be provided in the same electronic device. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and to receive audio input from the microphone 9132, thereby enabling typical telecommunication functions. The audio processor 9130 can include any suitable buffers, decoders, amplifiers, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, thereby enabling the recording of audio on the local device via the microphone 9132 and enabling the playing of stored audio on the local device via the speaker 9131.

[0156] The embodiment of the present application further provides a computer readable storage medium capable of implementing all steps of the method for determining the development scale of a heterogeneous gas reservoir in the above embodiment, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement all steps of the method for determining the development scale of a heterogeneous gas reservoir in the above embodiment, for example, the steps include:

[0157] The gas wells in the heterogeneous gas reservoir are classified into different types, the reasonable production of each gas well type is determined according to a fitting relationship between the reasonable production and the open flow capacity of each gas well type, the distribution range of each gas well type and the average single well control radius corresponding to the gas well type are determined, and the development scale of the heterogeneous gas reservoir is determined according to the reasonable production, the distribution range and the average single well control radius of each gas well type, so that the development scale of the gas reservoir can be determined according to different types of gas wells.

[0158] As can be seen from the above description, the computer readable storage medium provided by the embodiment of the present application can classify the gas wells in the heterogeneous gas reservoir into different types, determine the reasonable production of each gas well type according to a fitting relationship between the reasonable production and the open flow capacity of each gas well type, determine the distribution range of each gas well type and the average single well control radius corresponding to the gas well type, and determine the development scale of the heterogeneous gas reservoir according to the reasonable production, the distribution range and the average single well control radius of each gas well type, so that the development scale of the gas reservoir can be determined according to different types of gas wells, the prediction accuracy of the development scale is improved, the development decision of the heterogeneous gas reservoir can be effectively guided, and the development efficiency of the heterogeneous gas reservoir is improved.

[0159] Although the present application provides method operational steps as recited in the examples or flowcharts, more or fewer operational steps can be included based on conventional or non-creative labor. The order in which the steps are recited in the examples is only one of many possible execution sequences of the steps. The methods can be executed in the order recited in the examples or flowcharts or in parallel (e.g., in a parallel processor or multi-threaded processing environment) when the devices or client products are implemented in practice.

[0160] Those skilled in the art will appreciate that embodiments of the present specification can be readily used as a method, apparatus (system) or computer program product. Accordingly, the present specification can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code thereon.

[0161] The present application is described in reference to the flowcharts and / or block diagrams of the methods, apparatus (system) and computer program products in accordance with embodiments of the present application. It is to be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be enabled by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowcharts and / or block diagrams block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the function specified by the flow or flows and / or block or blocks.

[0162] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowcharts and / or block diagrams block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the function specified by the flow or flows and / or block or blocks.

[0163] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowcharts and / or block diagrams block or blocks. Figure 1 one or more flows and / or blocks Figure 1 Figure 1 means for carrying out the function specified by the flow or flows and / or block or blocks.

[0164] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application is not limited to any single aspect or embodiment and is not limited to any single combination and / or permutation of aspects and / or embodiments. Further, each aspect and embodiment of the present application can be used alone or in combination with one or more other aspects and embodiments.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. The modification or replacement does not change the essence of the corresponding technical solution, which should be covered in the scope of the claims and the specification of the present application.

Claims

1. A method for determining a production scale of a heterogeneous gas reservoir, characterized by, The method comprises the following steps: dividing the gas wells in the heterogeneous gas reservoir into different types; determining the reasonable production of each type of gas well according to a fitting relationship between the reasonable production and the open flow capacity of each type of gas well; determining the distribution range of each type of gas well and the average single-well control radius corresponding to the type of gas well; determining the development scale of the heterogeneous gas reservoir according to the reasonable production, the distribution range and the average single-well control radius of each type of gas well. The step of dividing the gas wells in the heterogeneous gas reservoir into different types comprises the following steps: calculating the open flow capacity and the dynamic reserves of the gas wells in the heterogeneous gas reservoir; determining the initial test production of the gas wells according to the open flow capacity; determining the linear relationship between the initial test production and the dynamic reserves of the gas wells in the double logarithmic coordinates; dividing the gas wells in the heterogeneous gas reservoir into different types according to the linear relationship. The step of determining the reasonable production of each type of gas well according to a fitting relationship between the reasonable production and the open flow capacity of each type of gas well comprises the following steps: determining a first fitting relationship between the dynamic reserves and a preset production allocation ratio of each type of gas well, and a second fitting relationship between the dynamic reserves and the open flow capacity; wherein the production allocation ratio is the ratio between the reasonable production and the open flow capacity; determining the fitting relationship between the reasonable production and the open flow capacity of each type of gas well according to the first fitting relationship and the second fitting relationship corresponding to each type of gas well; wherein the fitting relationship is used to determine the reasonable production of the gas wells in the heterogeneous gas reservoir.

2. The method of claim 1, wherein, The step of determining the development scale of the heterogeneous gas reservoir according to the reasonable production, the distribution range and the average single-well control radius of each type of gas well comprises the following steps: determining the number of wells in each type of gas well according to the distribution range and the average single-well control radius of each type of gas well; determining the development scale of the gas reservoir of each type of gas well according to the reasonable production and the number of wells of each type of gas well; wherein the development scales of all types of gas wells constitute the development scale of the heterogeneous gas reservoir.

3. A device for determining a production scale of a heterogeneous gas reservoir, characterized in that, The method comprises the following steps: a gas well dividing unit, configured to divide the gas wells in the heterogeneous gas reservoir into different types; a gas well reasonable production unit, configured to determine the reasonable production of each type of gas well according to a fitting relationship between the reasonable production and the open flow capacity of each type of gas well; an acquisition unit, configured to determine the distribution range of each type of gas well and the average single-well control radius corresponding to the type of gas well; a development scale unit, configured to determine the development scale of the heterogeneous gas reservoir according to the reasonable production, the distribution range and the average single-well control radius of each type of gas well. The gas well dividing unit comprises: a calculation module, configured to calculate the open flow capacity and the dynamic reserves of the gas wells in the heterogeneous gas reservoir; a test module, configured to determine the initial test production of the gas wells according to the open flow capacity; a linear module, configured to determine the linear relationship between the initial test production and the dynamic reserves of the gas wells in the double logarithmic coordinates; a dividing module, configured to divide the gas wells in the heterogeneous gas reservoir into different types according to the linear relationship. The gas well reasonable production unit comprises: The fitting module is configured to determine a first fitting relationship between the dynamic reserves of each gas well type and a preset production allocation ratio, and a second fitting relationship between the dynamic reserves and the open flow capacity; wherein the production allocation ratio is a ratio between the reasonable production and the open flow capacity; The production module is configured to determine a fitting relationship between the reasonable production and the open flow capacity according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the fitting relationship is used to determine the reasonable production of the gas well in the heterogeneous gas reservoir.

4. The apparatus for determining the scale of development of a heterogeneous gas reservoir according to claim 3, wherein, The production scale unit comprises: The well number calculation module is configured to determine the well number in each gas well type according to the distribution range and the average single well control radius of each gas well type; The scale calculation module is configured to determine the production scale of the gas reservoir of each gas well type according to the reasonable production of the gas well and the well number of each gas well type; wherein the production scales of all the gas well types constitute the production scale of the heterogeneous gas reservoir.

5. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the steps of the method for determining the production scale of the heterogeneous gas reservoir according to claim 1 or 2.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the method for determining the production scale of the heterogeneous gas reservoir according to claim 1 or 2.

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