Method and device for determining reasonable production of gas wells in heterogeneous gas reservoirs

Abstract

The present invention provides a method and device for determining the reasonable production of a gas well in a heterogeneous gas reservoir, the method comprising: classifying the gas wells in the heterogeneous gas reservoir into gas well types; 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate; determining a third fitting relationship between the reasonable production and the open flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of the gas wells in the heterogeneous gas reservoir. The present invention can more accurately evaluate the production capacity and reasonable production of the gas wells, and improve the development efficiency of the gas reservoir.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum gas reservoir development, and in particular to a method and a device for determining the reasonable production of a gas well in a heterogeneous gas reservoir. Background Art

[0002] For highly heterogeneous gas reservoirs, the storage space includes pores, fractures and holes, the storage and permeability media are complex, and the macroscopic and microscopic seepage characteristics of the reservoir are controlled by many factors. Affected by the geological conditions of the gas reservoir itself, the type of gas wells, the completion method of drilling and the acid fracturing process, the gas well test production capacity varies greatly, showing highly irregular characteristics. Some gas wells with high production tests may not necessarily maintain long-term stable production, and some gas wells with medium and low production tests can maintain medium- and long-term stable production on the basis of a certain production. Therefore, for highly heterogeneous gas reservoirs, the initial high production capacity (large open flow) and long-term stable production capacity (high dynamic reserves) of gas wells do not match. Therefore, scientifically evaluating the production capacity of gas wells and maintaining medium- and long-term stable production capacity on the basis of maintaining a certain scale can lay a good foundation for the stable production and efficient development of gas reservoirs. Determining the reasonable production of gas wells is an important task in the process of gas reservoir development. If the gas well production is too high, the gas reservoir will be damaged due to stress sensitivity. If there is edge and bottom water in the gas reservoir, it may cause the gas well to produce water too early, resulting in a reduction in the recovery rate of the entire gas reservoir. If the production is too low, the gas well investment recovery period will be too long, and the economic benefits of the entire gas field development will be reduced, or even no benefits. Therefore, determining the reasonable production capacity of gas wells is of great significance to whether the gas reservoir can be developed efficiently.

[0003] At present, the commonly used methods for determining the reasonable production of gas wells include empirical statistics, gas production curves, node analysis, system optimization, and numerical simulation. The empirical statistics method allocates production to gas reservoirs through the empirical formulas accumulated on site; the gas production curve method determines the avoidance; the node analysis method determines the coordinated production by the intersection of the inflow and outflow curves of the gas well under certain tubing size conditions; the system optimization method gives the fluid flow equations according to the fluid flow process (formation-bottom hole-wellhead) during the production of the gas well, and establishes a dynamic optimization mathematical model, and finally obtains the maximum gas production under certain constraints as the reasonable gas production of the gas well; the numerical simulation method is to establish a gas reservoir numerical model in the model area based on the established three-dimensional geological model of the gas reservoir, and use the gas reservoir data model for simulation calculation to predict development indicators. Among these methods, empirical statistics, gas production curves, and node analysis consider fewer factors, are relatively simple, and are greatly affected by human factors, and are more suitable for conventional gas reservoirs. The numerical simulation method considers more factors, but requires the establishment of a fine geological model, which cannot meet the requirements of rapid production allocation on site. The system optimization method can reduce improper production allocation and design errors caused by human factors, and the production allocation is fast. However, since the underground is a complex three-dimensional spatial reservoir, the system analysis results lack credibility if only the static data near the well point and the bottom well and wellhead pressure data are used for system analysis.

[0004] Therefore, there is an urgent need for a method or device for determining the reasonable production of a gas well in a heterogeneous gas reservoir. Summary of the invention

[0005] In view of the problems in the prior art, the present invention provides a method and device for determining the reasonable production of a gas well in a heterogeneous gas reservoir, which can more accurately evaluate the production capacity and reasonable production of the gas well and improve the development efficiency of the gas reservoir.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for determining a reasonable production of a gas well in a heterogeneous gas reservoir, comprising:

[0008] Classify gas wells in heterogeneous gas reservoirs into gas well types;

[0009] 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate;

[0010] A third fitting relationship between reasonable production and open flow is determined according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs.

[0011] The classification of gas well types for heterogeneous gas reservoir gas wells includes:

[0012] Calculate the open flow rate and dynamic reserves of gas wells in heterogeneous gas reservoirs;

[0013] Determine the initial test production of the gas well according to the unimpeded flow rate;

[0014] Determine the linear relationship between the initial test production and the dynamic reserves of the gas well in double logarithmic coordinates;

[0015] The gas well types in heterogeneous gas reservoirs are classified according to the linear relationship.

[0016] Wherein, the classification of heterogeneous gas reservoir gas well types according to the linear relationship includes:

[0017] Based on the linear relationship, gas wells that meet the same fitting curve are classified as gas wells of the same type.

[0018] The determination of 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 rate, includes:

[0019] Fitting the relationship between the dynamic reserves of each gas well type and the preset production allocation ratio to determine the curve relationship between the dynamic reserves and the production allocation ratio as a first fitting relationship;

[0020] The straight line relationship between the open flow and dynamic reserves of each gas well type in logarithmic coordinates is determined as the second fitting relationship.

[0021] In a second aspect, the present invention provides a device for determining a reasonable production of a gas well in a heterogeneous gas reservoir, comprising:

[0022] A classification module is used to classify the gas wells in heterogeneous gas reservoirs into gas well types;

[0023] A fitting module is used 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate;

[0024] The reasonable production module is used to determine the third fitting relationship between the reasonable production and the open flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs.

[0025] Wherein, the division module includes:

[0026] A calculation unit, used for calculating the open flow rate and dynamic reserves of a gas well in a heterogeneous gas reservoir;

[0027] A determination unit, used for determining the initial test production of the gas well according to the unimpeded flow rate;

[0028] A linear unit, used to determine the linear relationship between the initial test production and the dynamic reserves of the gas well in double logarithmic coordinates;

[0029] The classification unit is used to classify the gas well types in the heterogeneous gas reservoir according to the linear relationship.

[0030] Wherein, the division unit comprises:

[0031] The division subunit is used to classify the gas wells that meet the same fitting curve into the same type of gas wells based on the linear relationship.

[0032] Wherein, the fitting module comprises:

[0033] A first fitting unit is used to fit the relationship between the dynamic reserves of each gas well type and the preset production allocation ratio, and determine the curve relationship between the dynamic reserves and the production allocation ratio as a first fitting relationship formula;

[0034] The second fitting unit is used to determine the straight line relationship between the open flow and the dynamic reserves of each gas well type in logarithmic coordinates as a second fitting relationship.

[0035] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir are implemented.

[0036] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir.

[0037] It can be seen from the above technical scheme that the present invention provides a method and device for determining the reasonable production of gas wells in heterogeneous gas reservoirs, by classifying gas well types in heterogeneous gas reservoirs; 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate; determining a third fitting relationship between the reasonable production and the open flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs, which can more accurately evaluate the production capacity and reasonable production of gas wells and improve the development efficiency of gas reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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 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.

[0039] Figure 1 It is a flow chart of a method for determining a reasonable production rate of a gas well in a heterogeneous gas reservoir according to an embodiment of the present invention.

[0040] Figure 2 It is a cross-plot of the open flow rate and dynamic reserves of a completed gas well in an embodiment of the present invention.

[0041] Figure 3 This is a diagram for classifying conventional gas well types in the prior art.

[0042] Figure 4 This is a flow chart of step S101 in the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir according to an embodiment of the present invention.

[0043] Figure 5 This is a gas well type classification diagram in a method for determining a reasonable production rate of a gas well in a heterogeneous gas reservoir according to an embodiment of the present invention.

[0044] Figure 6 It is a fitting curve of the relationship between the production allocation, the open flow ratio and the dynamic reserves in the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir according to an embodiment of the present invention.

[0045] Figure 7 It is a schematic diagram of the structure of a device for determining a reasonable production of a gas well in a heterogeneous gas reservoir according to an embodiment of the present invention.

[0046] Figure 8 Schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] For highly heterogeneous gas reservoirs, in order to determine the reasonable production capacity of gas wells based on the ability to maintain medium- and long-term stable production and realize the scientific and efficient development of gas reservoirs, the existing methods either have too much human influence or require a large amount of data, which is cumbersome and difficult to quickly realize the reasonable evaluation of gas well production. In order to overcome the shortcomings of the existing methods, the present invention reasonably evaluates the reasonable production capacity of gas wells based on the open flow rate and dynamic reserve data of the well, thereby avoiding the mismatch between the initial high production capacity of the gas well and the long-term stable production capacity, and realizing the efficient development of gas reservoirs.

[0049] The present invention provides an embodiment of a method for determining a reasonable production of a gas well in a heterogeneous gas reservoir. Figure 1 The method for determining the reasonable production of a gas well in a heterogeneous gas reservoir specifically includes the following contents:

[0050] S101: Classify gas well types for gas wells in heterogeneous gas reservoirs;

[0051] For highly heterogeneous gas reservoirs, the initial test production of gas wells does not completely match the medium- and long-term stable production capacity of gas wells. Affected by the strong heterogeneity of reservoir development and acid fracturing technology, the wells drilled in the gas reservoir show high initial production during the production process, but poor long-term stable production capacity or medium-to-low production in the initial stage, but have a long period of stable production under the conditions of medium-to-low production allocation. Figure 2 For highly heterogeneous gas reservoirs, the initial open flow rate and dynamic reserves of gas wells are highly differentiated. Figure 3 The conventional practice for classifying gas wells in this type of gas reservoir is to combine production practice and overall data analysis of completed wells to determine the high production (high or low open flow rate) and stable production (dynamic reserve size) standards of gas wells, and divide gas wells into Class I wells (high test and high dynamic reserves), Class II wells (low test and high dynamic reserves), Class III wells (high test and low dynamic reserves) and Class IV wells (low test and low dynamic reserves). This classification method lacks comprehensive consideration of underground geological body characteristics, acid fracturing technology and gas well dynamic characteristics, and only mechanically classifies gas well types, which lacks practical guiding significance for the scientific and efficient development of gas fields.

[0052] In this step, based on the calculation results of open flow and dynamic reserves of gas wells, affected by the differences in macroscopic seepage characteristics between different blocks of the same gas reservoir, the intersection diagram of open flow and dynamic reserves of development wells presents different zoning characteristics. The sample points in a single area can be fitted into a straight line. The more complex the gas reservoir, the more zoning characteristics the intersection diagram of open flow and dynamic reserves of development wells presents. Gas wells in different regions are divided into one type of gas wells. This classification method comprehensively considers the geological characteristics within the block, the type of completed wells, and the acid fracturing transformation process measures. The type of gas well is the result of the combined effect of the geological conditions and process measures of the development well, which can better manage the gas well development indicators, production system, development countermeasures, etc., so as to achieve efficient development from gas wells to gas reservoirs.

[0053] It should be noted that this embodiment classifies completed development wells based on the differences in seepage characteristics. The most direct application scenario is to be able to regard seemingly isolated development wells as an organic whole, combine geological conditions and process measures, scientifically evaluate the production capacity of gas wells, and achieve the matching of high production capacity and stable production capacity of development gas wells, so as to avoid the unreasonable classification of gas well types, which leads to some gas wells having early high production (high unobstructed flow), rapid decline after a period of production, lack of medium- and long-term stable production capacity based on reasonable production capacity scale, and even rapid water invasion of edge and bottom water for water-bearing gas reservoirs, greatly reducing the recovery rate of gas reservoirs.

[0054] S102: 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 rate; wherein the production allocation ratio is a ratio between a reasonable production and the open flow rate;

[0055] In this step, it is necessary to determine 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, which specifically includes:

[0056] Fitting the relationship between the dynamic reserves of each gas well type and the preset production allocation ratio to determine the curve relationship between the dynamic reserves and the production allocation ratio as a first fitting relationship;

[0057] Among them, based on the dynamic reserves of the completed gas wells and the recovery rate of the gas reservoir, under certain stable production conditions, the corresponding relationship between the reasonable production of the gas wells and the open flow rate is formulated, so as to fit the mathematical relationship between the dynamic reserves and the ratio of the reasonable production to the open flow rate. This method takes into account the macroscopic seepage capacity of different types of gas wells, considers the macroscopic seepage characteristics of different types of gas wells under certain dynamic reserve conditions, and formulates the size of their 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 by type.

[0058] The straight line relationship between the open flow and dynamic reserves of each gas well type in logarithmic coordinates is determined as the second fitting relationship.

[0059] Among them, based on the calculation results of open flow and dynamic reserves of gas wells, affected by the differences in macroscopic seepage characteristics between different blocks of the same gas reservoir, the intersection diagram of open flow and dynamic reserves of development wells presents different zoning characteristics. The sample points in a single area can be fitted into a straight line. The more complex the gas reservoir, the more zoning characteristics the intersection diagram of open flow and dynamic reserves of development wells presents. Gas wells in different regions are divided into one type of gas wells. This classification method comprehensively considers the geological characteristics within the block, the type of completed wells, and the acid fracturing transformation process measures. The type of gas well is the result of the comprehensive effect of the geological conditions and process measures of the development well. It can better manage the development indicators, production system, development countermeasures of gas wells, and thus achieve efficient development from gas wells to gas reservoirs.

[0060] S103: Determine a third fitting relationship between reasonable production and open flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs.

[0061] In this step, through the above steps S101 and S102, the relationship between the dynamic reserves and the open flow rate of different types of gas wells, and the relationship between the dynamic reserves and the production allocation ratio can be obtained. On this basis, through formula derivation, the third fitting relationship between the reasonable production of different types of gas wells and the open flow rate can be obtained, so as to determine the reasonable production of gas wells by type.

[0062] 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.

[0063] Table 1 Gas well development index statistics

[0064]

[0065] From the above description, it can be seen that the method for determining the reasonable production of gas wells in heterogeneous gas reservoirs provided in an embodiment of the present invention is to classify the gas wells in heterogeneous gas reservoirs into gas well types; 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate; determine a third fitting relationship between the reasonable production and the open flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs, and comprehensively consider the initial high production capacity and long-term stable production capacity of the gas wells, so as to more accurately evaluate the production capacity of the gas wells, avoid the mismatch between the initial high production capacity and the long-term stable production capacity of the gas wells, and more accurately evaluate the reasonable production of the gas wells, thereby improving the development efficiency of the gas reservoirs.

[0066] In one embodiment of the present invention, a specific implementation method of step S101 in the above embodiment is provided. Figure 4 , including:

[0067] S1011: Calculate the open flow and dynamic reserves of gas wells in heterogeneous gas reservoirs;

[0068] S1012: determining the initial test production of the gas well according to the unobstructed flow rate;

[0069] S1013: Determine the linear relationship between the initial test production and the dynamic reserves of the gas well in double logarithmic coordinates;

[0070] S1014: Classify the gas well types in the heterogeneous gas reservoir according to the linear relationship.

[0071] The method of classifying the types of gas wells in the heterogeneous gas reservoir according to the linear relationship includes: based on the linear relationship, classifying the gas wells that meet the same fitting curve as the same type of gas wells.

[0072] In this embodiment, in the specific classification of gas well types, seismic data is used to consider the seismic impact characteristics, completion logging data is used to consider the characteristics of the geological body near the wellbore, test data is used to analyze the seepage characteristics around the wellbore, and dynamic data is used to analyze the macroscopic seepage characteristics of the entire gas well drilling geological body to classify the gas well types. For the same type of reservoir body, relative acid fracturing technology and gas well type are used.

[0073] Furthermore, when classifying the types of gas wells in heterogeneous gas reservoirs, it is necessary to calculate the open flow rate and dynamic reserves of the gas wells in the heterogeneous gas reservoirs; determine the initial test production of the gas wells according to the open flow rate; determine the linear relationship between the initial test production and the dynamic reserves of the gas wells in double logarithmic coordinates; and classify the types of development wells in heterogeneous gas reservoirs according to the linear relationship.

[0074] The classification of the types of development wells of heterogeneous gas reservoirs according to the linear relationship is based on the linear relationship, and the development wells that meet the same fitting curve are classified as the same type of gas wells.

[0075] In this embodiment, the initial test production of gas wells drilled into the same type of reservoir body and the dynamic reserves of the gas wells are in a linear relationship in double logarithmic coordinates. Based on this linear relationship, the gas wells can be classified into types. Sample points that meet the same fitting curve are classified as the same type of gas wells, and sample points that do not meet the same fitting curve are classified as different types of gas wells.

[0076] From the above description, it can be seen that the embodiment of the method for classifying gas well types in heterogeneous gas reservoirs of the present invention can evaluate the production capacity of development wells in a relatively comprehensive and systematic manner; it can combine the geological characteristics of the gas reservoir to interactively verify the distribution range of different types of development wells in the gas reservoir. Generally speaking, the same type of gas wells have obvious zoning characteristics within the gas reservoir; thereby improving the development efficiency of the gas reservoir and realizing efficient development of the gas reservoir.

[0077] To further illustrate the present solution, the present invention provides a specific example of a method for determining a reasonable production of a gas well in a heterogeneous gas reservoir, which specifically includes the following contents:

[0078] Taking the Sinian Deng 4 gas reservoir in Moxi, a certain basin, as an example, the Sinian gas reservoir is a karst weathering crust type carbonate rock gas reservoir. The development of effective reservoirs is controlled by the comprehensive control of sedimentation and karst, and the development of high-yield wells is controlled by favorable sedimentary microfacies, favorable micro-geomorphological units and micro-fractures. The gas reservoir exhibits strong heterogeneity.

[0079] 1. Classification of gas well types. Figure 3 Early classification focused on two parameters: open flow and dynamic reserves, and formulated high-yield standards (open flow greater than 100×10 4 m 3 ) and stable production standard (unimpeded flow greater than 10×10 8 m 3 ), the developed gas wells are divided into Class I wells (high test and high dynamic storage type), Class II wells (low test and high dynamic storage type), Class III wells (high test and low dynamic storage type) and Class IV wells (low test and low dynamic storage type). This classification method only mechanically classifies gas wells based on the open flow and dynamic reserves values, without considering the geological characteristics of the gas reservoir.

[0080] By dividing the gas wells into different zones, the gas wells drilled in the fourth member of the Moxi Deng gas reservoir can be divided into two types. Figure 5, the open flow rate and dynamic reserves of a single type of gas well show a linear relationship in logarithmic coordinates. Type I wells have well-developed matrix pores and fractures, good lateral connectivity, high test production, good stable production conditions, and long stable production time; Type II wells have relatively low dynamic reserves, poor stable production conditions, and short stable production period. Based on this classification method, the gas well development indicators can be scientifically demonstrated.

[0081] Class I well: log Gp = 0.5552·log Q aof +0.53 (Formula 1)

[0082] Class II well: log Gp = 1.0677·log Q aof -1.3799 (Formula 2)

[0083] Where Gp is ​​the dynamic reserves of the gas well (y in the figure), billion cubic meters; Q aof is the unobstructed flow rate of the gas well (x in the figure), ten thousand cubic meters per day.

[0084] 2. Dynamic reserves Gp and production ratio (reasonable production Q and unimpeded flow Q aof Ratio) relationship fitting. Figure 6 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, so that the relationship curve between dynamic reserves and production allocation ratio can be fitted.

[0085] Class I well: Gp = 53.897 μ -1.376 (Formula 3)

[0086] Class II well: Gp = 0.1585 μ -0.183 (Formula 4)

[0087] Where Gp is ​​the dynamic reserves of the gas well (y in the figure), billion cubic meters; Q aof is the unobstructed flow rate of the gas well, ten thousand cubic meters per day; μ is the production ratio (x in the figure), and its size is Dimensionless quantity; Q is reasonable output, ten thousand cubic meters per day.

[0088] 3. Determination of reasonable gas well production: The relationship between dynamic reserves and open flow obtained from step 1 is: log Gp = A·log Q aof +B, Gp is ​​the dynamic reserve, Q aof is the unobstructed flow, A and B are coefficients. The relationship between the production ratio and dynamic reserves obtained from step 2 is: μ is the production allocation ratio, Gp is ​​the dynamic reserves, M and N are coefficients. Therefore, it can be deduced that:

[0089]

[0090] In the formula, Qaof is the open-flow rate of the gas well, 10,000 cubic meters per day; Q is the reasonable production, 10,000 cubic meters per day, and A, B, M, and N are coefficients. From this, we can get the relationship between the reasonable production of a gas well and its open-flow rate, and the relationship is different for different types of gas wells.

[0091] For the Dengsi gas reservoir in Moxi, the formula for determining the reasonable production of Class I gas wells is:

[0092]

[0093] For the Dengsi gas reservoir in Moxi, the formula for determining the reasonable production of Class II gas wells is:

[0094]

[0095] At this point, the reasonable production of gas wells can be determined by type for the Deng 4 gas reservoir. Taking Moxi 22 well as an example, the well has an open flow of 2.223 million cubic meters per day, and the calculated dynamic reserves are 6.59 billion cubic meters. According to the gas well type, it belongs to Class I wells. The early production allocation is 300,000 cubic meters per day, and the unit pressure drop gas production is 54.63 million cubic meters per MPa. According to this allocation, the stable production period of the well can reach 10 to 20 years, which is obviously not economically cost-effective. This method is used for re-evaluation, and the reasonable production is calculated to be 620,000 cubic meters per day, which can guarantee a stable production period of more than 9 years, thereby supporting the medium- and long-term stable production of gas reservoirs on a certain scale and realizing efficient development of gas reservoirs.

[0096] The embodiment of the present invention provides a specific implementation of a device for determining the reasonable production of a gas well in a heterogeneous gas reservoir, which can realize all the contents of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir, see Figure 7 The device for determining the reasonable production of a gas well in a heterogeneous gas reservoir specifically includes the following contents:

[0097] A classification module 10 is used to classify the gas wells in the heterogeneous gas reservoir into gas well types;

[0098] The fitting module 20 is used 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate;

[0099] The reasonable production module 30 is used to determine a third fitting relationship between reasonable production and open flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs.

[0100] Wherein, the division module includes:

[0101] A calculation unit, used for calculating the open flow rate and dynamic reserves of a gas well in a heterogeneous gas reservoir;

[0102] A determination unit, used for determining the initial test production of the gas well according to the unimpeded flow rate;

[0103] A linear unit, used to determine the linear relationship between the initial test production and the dynamic reserves of the gas well in double logarithmic coordinates;

[0104] The classification unit is used to classify the gas well types in the heterogeneous gas reservoir according to the linear relationship.

[0105] Wherein, the division unit comprises:

[0106] The division subunit is used to classify the gas wells that meet the same fitting curve into the same type of gas wells based on the linear relationship.

[0107] Wherein, the fitting module comprises:

[0108] A first fitting unit is used to fit the relationship between the dynamic reserves of each gas well type and the preset production allocation ratio, and determine the curve relationship between the dynamic reserves and the production allocation ratio as a first fitting relationship formula;

[0109] The second fitting unit is used to determine the straight line relationship between the open flow and the dynamic reserves of each gas well type in logarithmic coordinates as a second fitting relationship.

[0110] The embodiment of the device for determining the reasonable production of a gas well in a heterogeneous gas reservoir provided by the present invention can be specifically used to execute the processing flow of the embodiment of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir in the above-mentioned embodiment. Its functions will not be repeated here, and reference may be made to the detailed description of the above-mentioned method embodiment.

[0111] From the above description, it can be seen that the device for determining the reasonable production of gas wells in a heterogeneous gas reservoir provided in an embodiment of the present invention divides the gas wells in the heterogeneous gas reservoir into gas well types; determines 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open-flow rate; determines a third fitting relationship between the reasonable production and the open-flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in the heterogeneous gas reservoir, and can more accurately evaluate the production capacity and reasonable production of the gas wells, thereby improving the development efficiency of the gas reservoir.

[0112] The present application provides an embodiment of an electronic device for implementing all or part of the content of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir. The electronic device specifically includes the following content:

[0113] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between related devices; the electronic device can be a desktop computer, a tablet computer and a mobile terminal, etc., and the present embodiment is not limited thereto. In the present embodiment, the electronic device can be implemented with reference to the embodiment of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir and the embodiment of the device for determining the reasonable production of a gas well in a heterogeneous gas reservoir, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0114] Figure 8 FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Figure 8 As shown, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that Figure 8 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0115] In one embodiment, the function of determining the reasonable production of a gas well in a heterogeneous gas reservoir may be integrated into the central processor 9100. The central processor 9100 may be configured to perform the following control:

[0116] Gas wells in heterogeneous gas reservoirs are classified into gas well types; 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 rate are determined; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate; a third fitting relationship between the reasonable production and the open flow rate is determined according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs.

[0117] From the above description, it can be seen that the electronic device provided in the embodiment of the present application divides the gas wells in a heterogeneous gas reservoir into gas well types; determines 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open-flow rate; determines a third fitting relationship between the reasonable production and the open-flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in a heterogeneous gas reservoir, and can more accurately evaluate the production capacity and reasonable production of the gas wells, thereby improving the development efficiency of the gas reservoir.

[0118] In another embodiment, the device for determining the reasonable production of gas wells in heterogeneous gas reservoirs can be configured separately from the central processor 9100. For example, the device for determining the reasonable production of gas wells in heterogeneous gas reservoirs can be configured as a chip connected to the central processor 9100, and the function of determining the reasonable production of gas wells in heterogeneous gas reservoirs can be realized through the control of the central processor.

[0119] like Figure 8 As shown, the electronic device 9600 may also include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Figure 8 In addition, the electronic device 9600 may also include Figure 8 For components not shown, reference may be made to the prior art.

[0120] like Figure 8 As shown, the central processing unit 9100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0121] The memory 9140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 9100 may execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0122] 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 provide power to the electronic device 9600. The display 9160 is used to display display objects such as images and texts. The display may be, for example, an LCD display, but is not limited thereto.

[0123] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 9600 through the central processor 9100.

[0124] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0125] The communication module 9110 is a transmitter / receiver 9110 that sends and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0126] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module, etc. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby realizing a common telecommunication function. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0127] The embodiment of the present invention also provides a computer-readable storage medium capable of implementing all the steps in the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir in the above embodiment. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, all the steps in the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0128] Gas wells in heterogeneous gas reservoirs are classified into gas well types; 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 rate are determined; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate; a third fitting relationship between the reasonable production and the open flow rate is determined according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of gas wells in heterogeneous gas reservoirs.

[0129] From the above description, it can be seen that the computer-readable storage medium provided in the embodiment of the present invention divides the gas wells in the heterogeneous gas reservoir into gas well types; determines 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open-flow rate; determines a third fitting relationship between the reasonable production and the open-flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of the gas wells in the heterogeneous gas reservoir, and can more accurately evaluate the production capacity and reasonable production of the gas wells, thereby improving the development efficiency of the gas reservoir.

[0130] Although the present invention provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, in a parallel processor or multi-threaded processing environment).

[0131] It should be understood by those skilled in the art that the embodiments of this specification may be provided as methods, devices (systems) or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0132] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0133] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0135] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. The present invention is not limited to any single aspect, any single embodiment, or any combination and / or replacement of these aspects and / or embodiments. Moreover, each aspect and / or embodiment of the present invention can be used alone or in combination with one or more other aspects and / or embodiments thereof.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for determining the reasonable production of a gas well in a heterogeneous gas reservoir, characterized in that: include: Classify gas wells in heterogeneous gas reservoirs into gas well types; 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate; Determine a third fitting relationship between reasonable production and open flow rate according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of a gas well in a heterogeneous gas reservoir; The classification of gas well types for heterogeneous gas reservoir gas wells includes: Calculate the open flow rate and dynamic reserves of gas wells in heterogeneous gas reservoirs; Determine the initial test production of the gas well according to the unimpeded flow rate; Determine the linear relationship between the initial test production and the dynamic reserves of the gas well in double logarithmic coordinates; Classifying the gas well types of heterogeneous gas reservoirs according to the linear relationship; The classification of heterogeneous gas reservoir gas well types according to the linear relationship includes: Based on the linear relationship, the gas wells that meet the same fitting curve are classified as gas wells of the same type; The determination of 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 rate, includes: According to the relationship fitting between the dynamic reserves of each gas well type and the preset production allocation ratio, the curve relationship between the dynamic reserves and the production allocation ratio is determined as a first fitting relationship formula; the first fitting relationship formula is: Among them, μ is the production allocation ratio, Gp is ​​the dynamic reserves, and M and N are coefficients; Determine that the straight line relationship between the open flow and dynamic reserves of each gas well type in logarithmic coordinates is the second fitting relationship; the expression of the second fitting relationship is: logGp=A·logQ aof +B Among them, Q aof is the unobstructed flow, A and B are coefficients; Depend on It can be deduced that: Among them, Q is the reasonable output, the unit is ten thousand cubic meters per day.

2. A device for determining the reasonable production of a gas well in a heterogeneous gas reservoir, characterized in that: include: A classification module is used to classify the gas wells in heterogeneous gas reservoirs into gas well types; A fitting module is used 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 rate; wherein the production allocation ratio is the ratio between the reasonable production and the open flow rate; A reasonable production module is used to determine a third fitting relationship between reasonable production and open flow according to the first fitting relationship and the second fitting relationship corresponding to each gas well type; wherein the third fitting relationship is used to determine the reasonable production of a gas well in a heterogeneous gas reservoir; The division module comprises: A calculation unit, used for calculating the open flow rate and dynamic reserves of a gas well in a heterogeneous gas reservoir; A determination unit, used for determining the initial test production of the gas well according to the unimpeded flow rate; A linear unit, used to determine the linear relationship between the initial test production and the dynamic reserves of the gas well in double logarithmic coordinates; A classification unit, used for classifying the gas well types of the heterogeneous gas reservoir according to the linear relationship; The division unit comprises: The sub-units are divided to classify the gas wells that meet the same fitting curve into the same type of gas wells based on the linear relationship; The fitting module comprises: The first fitting unit is used to fit the relationship between the dynamic reserves of each gas well type and the preset production allocation ratio, and determine the curve relationship between the dynamic reserves and the production allocation ratio as a first fitting relationship; the first fitting relationship is: Among them, μ is the production allocation ratio, Gp is ​​the dynamic reserves, and M and N are coefficients; The second fitting unit is used to determine that the straight line relationship between the open flow and the dynamic reserves of each gas well type in logarithmic coordinates is a second fitting relationship; the second fitting relationship is expressed as: logGp=A·logQ aof +B Among them, Q aof is the unobstructed flow, A and B are coefficients; Depend on It can be deduced that: Among them, Q is the reasonable output, the unit is ten thousand cubic meters per day.

3. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir as described in claim 1 are implemented.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for determining the reasonable production of a gas well in a heterogeneous gas reservoir as described in claim 1 are implemented.

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