A novel method and system for reasonably distributing production of a tight gas well based on a stable production period

Abstract

The application discloses a novel compact gas reservoir gas well reasonable production allocation method and system based on stable production period, and the reasonable production allocation method comprises the following steps: S1, obtaining the production-time data of a target gas well, and arranging the production-time data according to the production size in a power reduction manner; S2, calculating the matter balance time-production data of the production data arranged in the power reduction manner; obtaining the maximum matter balance time according to the matter balance time-production data; S3, judging the relationship between the stable production time and the maximum matter balance time, and then substituting the stable production time into the matter balance time data according to the matter balance time-production data to obtain the reasonable working system of the target gas well at the stable production time. The method depends on the static data and dynamic data in the gas well production data, effectively reduces the cost of a large number of experiments and dynamic monitoring required by other methods, can quickly determine a reasonable production allocation scheme, and realizes efficient and stable exploitation of the gas well.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas field development, and particularly relates to a novel reasonable production allocation method and system for tight gas reservoir gas wells based on a stable production period. BACKGROUND

[0002] Reasonable production allocation is a reasonable production capacity that should be allocated when a gas well is put into production, considering factors such as reservoir geological conditions and development benefits. Reasonable production allocation needs to determine a reasonable working system of the gas well, and the reasonable working system is one of the important means to realize stable production of the gas well, delay the life cycle of the gas well and ensure the safety of the mine site, and is also one of the most economical and effective ways to improve the recovery of the gas reservoir. Therefore, how to research a reasonable production allocation scheme for the gas well according to static and dynamic data of the gas well to realize efficient development of the gas reservoir has always been a popular topic for domestic and foreign experts and scholars, and is also a core content of development technology policy research in the process of preparing a development plan for the gas reservoir.

[0003] At present, the reasonable production allocation methods for determining the reasonable working system of the gas well mainly include six types, which are as follows.

[0004] (1) Indicator curve method, which takes full use of formation energy as a starting point and includes an indicator curve method based on laboratory conditions and an indicator curve method based on production capacity well testing conditions; the indicator curve method enables the maximum possible natural gas to flow in a Darcy flow manner, thereby improving the comprehensive utilization rate of the formation energy, but the indicator curve method under the laboratory conditions needs to use a large number of experiments, thereby increasing the development cost of the gas reservoir, and the indicator curve method based on the well testing conditions cannot quantitatively depict the critical condition, although the scholars have proposed to use a loss ratio for calibration, but it is difficult to implement how to determine the loss ratio, and the precision of the reasonable production allocation using the method is low.

[0005] (2) Analogy method (also known as experience method, or open flow capacity method), which is a method of obtaining the same gas well production allocation ratio of the gas reservoirs with the same geological conditions according to the similarity principle; the analogy method is simple to use, but the primary condition of the method is to require the open flow capacity of the gas well, and the calculation of the open flow capacity is based on the well testing technology, which undoubtedly increases the development cost of the gas reservoir, and the geological conditions of the gas reservoir have regional characteristics, and the reasonable production allocation of the gas well depends not only on the open flow capacity of the gas well, so the method often causes a large error in determining the reasonable production allocation of the gas well, leading to early depletion of the gas well.

[0006] (3) Dynamic method (also known as test production method), which is a method of determining the reasonable production of the gas well according to the production dynamic data of the gas well to continuously track the pressure change characteristics of the gas well under different production working systems; the dynamic method mainly relies on the dynamic production data of the gas well, and has the characteristics of economy and simplicity, but the pressure change characteristics are observed by setting different production systems, the time scale is difficult to depict, and a unified standard is also lacked for quantitative depiction and description, and the method has the defect of strong subjectivity.

[0007] (4) Numerical simulation method, which is based on gas well percolation mechanics, studies the reasonable production of gas wells under different stable production periods on the basis of gas reservoir geological modeling and gas well history matching. The numerical simulation method can better depict the reasonable production of gas wells under different time scales, but numerical simulation is based on three-dimensional geological modeling, which is not only complex but also requires a large amount of manpower and financial resources. Moreover, the current numerical simulator is based on Darcy's law, which is difficult to adapt to the reasonable proration of complex gas reservoirs and has great limitations.

[0008] (5) Critical production method, including economic limit production to ensure economic benefit of gas wells, critical liquid carrying flow rate to prevent bottom hole liquid loading due to slip effect, and critical production to prevent sand production due to high proration. The critical production method is mainly based on benefit, liquid carrying condition and sand prevention in principle. The benefit requirement, liquid carrying level and sand production condition of gas wells in actual gas reservoir development process have particularity, and the analysis results have great difference with the change of gas price and theoretical model. Therefore, it is usually used as an auxiliary analysis method and does not have generalization and continuity in the development of reasonable working system of gas wells.

[0009] (6) IPR curve method (node analysis method), which is a system analysis method considering production process coordination. The node analysis method is usually used for engineering applications such as selection of gas well tubing string, and belongs to artificial interference gas well proration. Therefore, in actual analysis, it is used as an auxiliary analysis method as the critical production method.

[0010] The six types of production allocation methods have advantages and disadvantages in determining the reasonable working system of the gas well, and are widely used in the development process of conventional gas reservoirs. At the same time, with the increasing depletion of conventional gas reservoirs, unconventional gas reservoirs such as tight gas reservoirs are increasingly becoming a replacement energy. Compared with conventional gas reservoirs, unconventional gas reservoirs have strong heterogeneity, complex geological conditions and percolation mechanism (for example, there is stress sensitivity and starting pressure), which often cause problems such as difficulty in accurately establishing a geological model and difficulty in accurately describing the gas well productivity equation. The exponential curve method, analogy method and numerical simulation method based on well testing and percolation mechanism have great limitations in their use conditions, and the tight gas reservoirs often need to be modified by volume fracturing and other engineering processes due to the low natural productivity of the gas well in the dense reservoir, resulting in the phenomenon of pressure and production increasing simultaneously during the production of the gas well, which makes it difficult to effectively determine the reasonable production by the dynamic method. The existing reasonable production allocation method is still complex and inefficient in production allocation. In the reasonable production allocation, the productivity of each well should be fully utilized, and the productivity of the gas wells should be optimally matched. If the productivity is too small, the potential of the gas well cannot be fully utilized, and if the productivity is too large, it is not conducive to the stable production of the gas well. Therefore, how to analyze the reasonable production allocation of the gas reservoir under different stable production time scales is also a difficult problem to be solved. SUMMARY

[0011] The purpose of the present application is to solve the problem of the complex process and high cost of the existing reasonable production allocation method, and to provide a new type of tight gas reservoir gas well reasonable production allocation method and system based on the stable production period.

[0012] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical solutions:

[0013] A reasonable production allocation method for tight gas reservoir gas wells based on a stable production period, comprising the following steps:

[0014] Step S1, obtaining the production-time data of the target gas well, and arranging the production-time data according to the size of the production by power reduction;

[0015] Step S2, calculating the material balance time-production data of the power-reduced production data; obtaining the maximum material balance time according to the material balance time-production data;

[0016] Step S3, judging the relationship between the stable production time and the maximum material balance time, if the stable production time is less than or equal to the maximum material balance time, then substituting the stable production time into the material balance time data according to the material balance time-production data to obtain the reasonable working system of the target gas well under the stable production time;

[0017] If the stable production time is greater than the maximum material balance time, the production-time data of the target gas well in step S1 is updated, and steps S1-S3 are performed to obtain the reasonable working system of the target gas well at the stable production time.

[0018] In the technical scheme of the present application, firstly, the existing production-time data of the target gas well is arranged in descending order to obtain the production in descending order, and then the material balance time at different production is calculated (the material balance time is the ratio of cumulative production to production), and the material balance time-production data is obtained. The material balance time-production data is used as the data basis for subsequent calculation of the reasonable working system. According to the stable production period required by the gas reservoir development, the stable production time is obtained. Then, according to the relationship between the stable production time and the maximum material balance time, the material balance time is taken as the stable production time, and the reasonable working system of the target gas well at the stable production time is obtained according to the material balance time-production data. The production corresponding to the material balance time after the stable production time is substituted into the material balance time-production data is the reasonable working system at the stable production time. The present application realizes the formulation of the reasonable working system based on the stable production period by using the production-time data of the gas well, which makes up for the lack of the stable production period in the traditional indication curve method, analogy method, dynamic method and other methods for researching the reasonable working system, and overcomes the difficulty of effectively depicting the characteristics of the gas reservoir under the condition of the numerical simulation method based on the three-dimensional geological modeling of the complex gas reservoir. The method of the present application is a simple, economical and convenient industrial process method for gas well reasonable production allocation based on the stable production period as a unified description standard, which overcomes the defects of poor applicability, weak operability and high cost of the traditional method, and further provides a new method for efficient development of the tight gas reservoir, which is a reasonable production allocation method suitable for the tight gas reservoir.

[0019] As a preferred scheme of the present application, in step S1, the production-time data of the gas well is obtained according to the static data and dynamic data of the gas reservoir.

[0020] As a preferred scheme of the present application, before the production-time data is arranged in descending order, the production-time data is preprocessed, and the preprocessing includes removing the data points with a production rate less than 100% and / or the data points with a production less than the abandoned production. The data points with a production rate less than 100% are caused by abnormal production of the gas well, and the abandoned production is determined by different projects, production conditions and other factors in each mine area. Generally, the abandoned production is 1000 m3 / d. In the data analysis, the data points with a production rate less than 100% and / or the data points with a production less than the abandoned production are removed to prevent the influence of abnormal data, so that the calculated material balance time is more continuous, and the analysis accuracy of the method of the present application is improved.

[0021] As a preferred scheme of the present application, when the stable production time is taken as the material balance time, if there is no data point in the material balance time-yield data in which the material balance time is equal to the stable production time, the average yield of the yield corresponding to the two material balance times closest to the stable production time is taken as the reasonable production allocation work system. That is, when the stable production time t is not equal to the material balance time t in the material balance time-yield data, t is the stable production time, t is the material balance time point in the material balance time-yield data, t and t are selected to satisfy t < t < t, t and t correspond to the yields q and q respectively, and the average yield of q and q is taken as the reasonable production allocation work system. MBT-i As a preferred scheme of the present application, when the stable production time is taken as the material balance time, if there is no data point in the material balance time-yield data in which the material balance time is equal to the stable production time, the average yield of the yield corresponding to the two material balance times closest to the stable production time is taken as the reasonable production allocation work system. That is, when the stable production time t is not equal to the material balance time t in the material balance time-yield data, t is the stable production time, t is the material balance time point in the material balance time-yield data, t and t are selected to satisfy t < t < t, t and t correspond to the yields q and q respectively, and the average yield of q and q is taken as the reasonable production allocation work system. MBT-i MBT-m MBT-n MBT-m MBT-i MBT-n MBT-m MBT-n m n m n MBT-m MBT-n m n

[0022] As a preferred scheme of the present application, in step S3, if the stable production time is greater than the maximum material balance time, when the yield of the target gas well is in a decline period, a decline model is used to predict the yield of the target gas well, the yield-time data of the target gas well in step S1 is updated, steps S1-S3 are executed, and the reasonable work system of the target gas well at the stable production time is obtained.

[0023] When the yield of the target gas well is not in a decline period, a standard gas well is selected in the work area, the yield-time data of the target gas well in step S1 is updated according to the yield-time data of the standard gas well, steps S1-S3 are executed, and the reasonable work system of the target gas well at the stable production time is determined.

[0024] As a preferred scheme of the present application, in step S3, when the gas well is in a decline period, the yield is predicted by using the Arps decline model according to the original data of the gas well, the original data and the prediction result are used to form the yield-time data of the target gas well, and the yield-time data of the target gas well in step S1 is updated.

[0025] As a preferred scheme of the present application, the condition for selecting the standard gas well is that the open flow capacity of the standard gas well and the open flow capacity of the target gas well differ by no more than 5×10 4 m 3 / d. ​​​​​​​​​​​​​​​​

[0026] Another aspect of the present application also provides a system for reasonably distributing production of a gas well in a compact gas reservoir based on a stable production period, the system comprising:

[0027] an acquisition module configured to acquire production-time data of a target gas well;

[0028] a first processing module configured to arrange the production-time data obtained by the acquisition module according to the size of production in a descending power;

[0029] a first calculation module configured to calculate the production data arranged in a descending power obtained by the first processing module to obtain material balance time-production data, and obtain a maximum material balance time according to the material balance time-production data;

[0030] a second calculation module configured to determine the relationship between the stable production time and the maximum material balance time, if the stable production time is less than or equal to the maximum material balance time, then the stable production time is substituted into the material balance time data to obtain a reasonable working system of the target gas well at the stable production time according to the material balance time-production data, if the stable production time is greater than the maximum material balance time, the production-time data of the target gas well in step S1 is updated, and steps S1-S3 are executed to obtain the reasonable working system of the target gas well at the stable production time.

[0031] The present application provides an electronic device, comprising a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, the machine readable instructions are executed by the processor to realize the above-mentioned method for reasonably distributing production of a gas well in a compact gas reservoir based on a stable production period.

[0032] The present application provides a computer readable storage medium, the readable storage medium stores at least one instruction, at least one program, a code set or an instruction set, the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to realize the above-mentioned method for reasonably distributing production of a gas well in a compact gas reservoir based on a stable production period.

[0033] Compared with the prior art, the present application has the following advantages:

[0034] The application provides a gas reservoir reasonable production allocation method based on a stable production period, which depends on static data and dynamic data in gas well production data, effectively reduces a large number of experiments and dynamic monitoring costs required by other methods, can quickly determine a reasonable production allocation scheme, has high production allocation efficiency, can economically and accurately predict a reasonable production system calculation of the gas well under the stable production time, has an important cost reduction and benefit increasing effect on realizing gas reservoir development, can realize low-cost development and long-term stable production of the tight gas reservoir, and helps the decision of oil and gas field related companies due to the reasonable work system of the gas reservoir based on the stable production period. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a flowchart of a tight gas reservoir water invasion early identification method;

[0036] Figure 2 It is a schematic diagram of removing data points with a production rate less than 100% of a certain well in the Xujiahe gas reservoir in western Sichuan;

[0037] Figure 3 It is Figure 2 a gas well production-time data graph of a corresponding gas well after pretreatment;

[0038] Figure 4 It is Figure 2 a gas well material balance time-production data graph;

[0039] Figure 5 It is Figure 2 a reasonable work system diagram of the gas well for different stable production times;

[0040] Figure 6 It is a material balance time-production data graph of a certain well in the Xujiahe gas reservoir in western Sichuan provided by the application;

[0041] Figure 7 It is Figure 6 a production prediction graph of a corresponding gas well in the middle;

[0042] Figure 8 It is Figure 7 a material balance time-production prediction graph of the gas well in the middle;

[0043] Figure 9 It is an actual production comprehensive curve corresponding to Figure 6 ;

[0044] Figure 10 It is a production curve graph of a certain gas well in the Xujiahe gas reservoir in western Sichuan by using open flow potential analogy to formulate a reasonable work system;

[0045] Figure 11 It is an actual production curve graph of a certain well in the Xujiahe gas reservoir in western Sichuan;

[0046] Figure 12 It is aFigure 11 A corresponding gas well material balance time-production data graph. DETAILED DESCRIPTION

[0047] The application will be further described in connection with test examples and specific embodiments. However, it should not be understood that the above-mentioned subject matter of the application is limited to the following examples only, and any technology realized based on the content of the application falls within the scope of the application.

[0048] Example 1

[0049] As shown in the figure, a reasonable production allocation method for a tight gas reservoir gas well based on a stable production period includes the following steps: Figure 1 Step S1, obtaining the production-time data of a target gas well, and arranging the production-time data according to the production size by power reduction;

[0050] Step S2, calculating the material balance time-production data of the production data arranged by power reduction, and obtaining the maximum material balance time according to the material balance time-production data;

[0051] Step S3, judging the relationship between the stable production time and the maximum material balance time, if the stable production time is less than or equal to the maximum material balance time, then the stable production time is substituted into the material balance time data to obtain the reasonable working system of the target gas well at the stable production time according to the material balance time-production data;

[0052] If the stable production time is greater than the maximum material balance time, when the production of the target gas well is in a decline period, the production of the target gas well is predicted by a decline model, the production-time data of the target gas well in step S1 is updated, and steps S1-S3 are executed to obtain the reasonable working system of the target gas well at the stable production time;

[0053] When the production of the target gas well is not in a decline period, a standard gas well is selected in the work area, the production-time data of the target gas well in step S1 is updated according to the production-time data of the standard gas well, and steps S1-S3 are executed to determine the reasonable working system of the target gas well at the stable production time.

[0054] The production-time data of the gas well is obtained according to the static and dynamic data of the gas reservoir. It should be noted that the production can be daily gas production or hourly gas production, and appropriate production is used according to the accuracy of the gas reservoir data collected in the actual application process, and the commonly used one is daily gas production.

[0055]

[0056] ​The present embodiment takes a well in Xujia gas reservoir in western Sichuan as an example, and the obtained production-time data is preprocessed, which includes removing data points with production rate less than 100% and data points with production less than abandonment production. The data points with production rate less than 100% are caused by abnormal production of the gas well. After removing the data points with production rate less than 100%, the production-time data is as shown in Figure 2 The abandonment production is determined according to different projects, production conditions and other factors in each mine area, and generally is 1000 m3 / day.

[0057] The preprocessed production-time data is as shown in Figure 3 Then, the power arrangement according to the production size is performed, the material balance time-production data is calculated according to the ratio of cumulative production to production, and the material balance time-production data is as shown in Figure 4 The maximum material balance time t MBT-max of the gas well under the current production condition is 5420 days.

[0058] In order to obtain a reasonable working system, the present application takes the stable production time as the material balance time of the gas well, and analyzes as follows:

[0059] According to the material balance principle of the gas reservoir, the elastic gas drive gas reservoir (gas well) follows the material balance equation, and the material balance equation at this time is:

[0060]

[0061] In the formula, p is the formation pressure of the gas reservoir, the unit is MPa; Z is the deviation factor, dimensionless; C w is the formation water compression coefficient, the unit is 1 / MPa; S wi is the irreducible water saturation, dimensionless; C p is the effective compression coefficient of the rock, the unit is 1 / MPa; Δp is the pressure change of the gas reservoir, the unit is MPa; p i is the original formation pressure of the gas reservoir, the unit is MPa; Z i is the original deviation factor of the gas reservoir, dimensionless; G p is the cumulative gas production of the gas reservoir, the unit is 10 8 m 3 ; G is the reserve of the gas reservoir, the unit is 10 8 m 3 .

[0062] Meanwhile, the elastic water drive gas reservoir (gas well) satisfies the material balance equation, and the material balance equation at this time is:

[0063]

[0064] In the formula, W e is the cumulative water invasion of the gas reservoir, the unit is m 3;W p is the cumulative water production, unit is m 3 ;B w is the formation water volume coefficient, dimensionless;B gi is the natural gas original volume coefficient, dimensionless.

[0065] According to the above formula (1), (2) shows that the gas reservoir material balance principle is irrelevant to the gas reservoir production path, that is, no matter how to change the work system or constant work system, it meets the material balance equation. It is permissible to assume that the gas well is stable production after production, that is, the daily production of the gas well is the constant work system q, unit is 10 4 m 3 / d; then for any cumulative production G p , there is a stable production time t, which meets the relationship:

[0066]

[0067] In the formula, t is the stable production time of the gas well, unit is d; formula (3) is substituted into formula (1) and (2) to obtain:

[0068]

[0069]

[0070] According to the definition of material balance time, the material balance time is the ratio of cumulative production to production, and the stable production time is the ratio of cumulative production to production under the condition of fixed production of the gas well, that is, the stable production time t is the material balance time t MBT of the gas well.

[0071]

[0072] In the formula, t MBT is the material balance time, unit is d; at the same time, from formula (3), (6), it can be seen that the stable production time of the gas well and the corresponding reasonable work system have uniqueness, that is, the stable production time is certain, the corresponding reasonable work system exists and has uniqueness, and the cumulative production of the gas well is certain, according to formula (6), it can be seen that the higher the work system, the shorter the stable production time of the gas well, this conclusion is consistent with the development practice in the field, so the relationship between the material balance time of the gas well and the production is found, that is, the relationship between the stable production time of the gas well and the reasonable work system is found.

[0073] On the other hand, according to the fluid percolation theory, the gas well production is a function of pressure difference, that is, it meets the following formula:

[0074] q = Av = f (Δp') (7)

[0075] In the formula, A is the percolation area, unit is m 2; v is the seepage velocity, unit is m / d; Δp' is the production pressure difference, unit is MPa. At the same time, according to the fluid dynamics equation (Darcy's law or non-Darcy law containing turbulence effect) as follows:

[0076]

[0077] In the formula, Δp is the increment of production pressure difference, unit is MPa; Δv is the increment of seepage velocity, unit is m / d; according to formula (8), combined with higher mathematics theory, formula (8) shows that the seepage velocity is a continuous function of the production pressure difference; (7), (8) are obtained simultaneously:

[0078]

[0079] In the formula, Δq is the increment of daily production, unit is m / d; formula (9) shows that the production is a continuous function of the production pressure difference, for the actual mine development practice, the production data is recorded in the form of daily production, that is

[0080]

[0081] In the formula, q i is the daily gas production of the i day, unit is 10 4 m 3 / d; n is the number of production, unit is d; is the average daily production pressure difference under the condition of daily production q i , unit is MPa. Let

[0082] q max = max (q1, q2, … q n ) (11)

[0083] q min = min (q1, q2, … q n ) (12)

[0084] In the formula, q min , q max respectively represent the minimum daily production, the maximum daily production in the actual production data, unit is 10 4 m 3 / d. For any working system q, q ∈ (q max , q min ), according to the mean value theorem, there exists such that,

[0085]

[0086] In the formula, is the average daily production pressure difference when the production working system is q, unit is MPa.

[0087] From the above equations (4), (5), (6) and (13), it can be seen that for any stable production period, there exists and only exists one reasonable work system q and daily average production pressure difference The stable time t of the gas well is achieved, and the stable production period time is the corresponding material balance time.

[0088] According to the above analysis, for any stable production period, there exists and only exists one reasonable work system q and daily average production pressure difference The stable time t of the gas well is achieved, and the stable production period time is the corresponding material balance time. MBT . Figure 5 is a schematic diagram of reasonable work system of gas well at different stable production time according to the material balance time-production data of Figure 4 , if the stable production time t is required to be 3 years (1095 days), the reasonable work system is obtained to be 0.45×104m3 / d through the material balance time-production data of Figure 5 , if the stable production time t is required to be 5 years (1825 days), the stable production time t is less than t MBT-max , since there is no material balance time of 1825 days in the material balance time-production data, two points close to 1825 days are selected, and there only exists the reasonable work system of 0.33×104m3 / d corresponding to 1824 days, and the reasonable work system of 0.32×104m3 / d corresponding to 1826 days, so the average value of 0.33×104m3 / d (rounded) is taken as the reasonable work system.

[0089] Embodiment 2

[0090] This embodiment is similar to embodiment 1, and the material balance time-production data graph of a well in Xujia gas reservoir in western Sichuan obtained by the reasonable production allocation method of embodiment 1 is shown in Figure 6 , from which it can be seen that the well can achieve the reasonable production allocation scheme of stable production period within 2050 days (5 years and a half), but the reasonable work system greater than 2050 days is difficult to predict. In order to calculate the reasonable work system, the production data of the gas well need to be predicted.

[0091] When the gas well has entered the decline period, Figure 7 is Figure 6 the production prediction graph of the corresponding gas well, the original data of the gas well is used, the production decline of the gas well follows the exponential decline of Arps (the correlation coefficient is close to 1), the Arps decline model is used for production prediction, the original data and the prediction result form the production-time data of the gas well, which is updated to the production-time data of the gas well in step S1, and steps S1-S3 are executed, Figure 8 is Figure 7 the material balance time-production data graph of the gas well after production prediction in , and the reasonable work system of the gas well at different stable production time is obtained according to the material balance time-production data of .Figure 6 In comparison, the material balance time-yield relationship graph is extended to 4400 days (12 years) by the well production prediction, and the reasonable working system of the target gas well under the stable production time is obtained.

[0092] When the target gas well production is not in the decline period, the conditions of the standard gas well are selected as follows: the open flow capacity of the standard gas well and the open flow capacity of the target gas well differ by no more than 5*10 4 m 3 The reasonable working system of the target gas well under the stable production time is determined according to the material balance time-yield data of the standard gas well.

[0093] Figure 9 is the actual production comprehensive curve provided by the present application Figure 6 , the gas well was put into production in January 2022, the maximum working system after the gas well was put into production was 132.3*104 m3 / d, the current working system was 76.8*104 m3 / d, the average daily gas production was about 102.4*104 m3 / d, the stable production period plan of the well capacity construction scheme was 5 years (1825 days), and the well production prediction showed that to realize stable production for 5 years, the reasonable working system should be 41.1*104 m3 / d, obviously, the current working system is too high and far greater than the reasonable working system proposed in the present application, from Figure 8 it can be seen that the pressure and the production appear double decline, and it also shows the effectiveness of the method of the present application. Figure 9

[0094] Figure 10 is a production curve graph of a gas well in the Xujiahe gas reservoir in western Sichuan, which is formulated by using the open flow capacity analogy method to formulate the reasonable working system, the well is approved to have an open flow capacity of 212*104 m3 / d, which is not much different from the open flow capacity (254) shown in Figure 8 , according to the material balance time-yield curve of the gas well, it is predicted that the gas well realizes stable production for more than 2 years, and the reasonable working system of the gas well should be lower than 80*104 m3 / d, from Figure 8 the gas production curve can be seen that when the working system of the well is higher than 80*104 m3 / d in the early stage, the gas well production and the pressure double decline, and after adjusting to about 70*104 m3 / d, the gas well realizes the double stable target of the pressure and the production, which also shows the effectiveness and reliability of the method and technology of the present application. Figure 10

[0095] Figure 11 is the actual production curve graph of a well in the Xujiahe gas reservoir in western Sichuan provided by the present application, the well is produced by using an average working system of 53*104 m3 / d in the early stage to realize stable production for 4.5 years. Figure 12 is the corresponding gas well material balance time-yield data graph, according to the analysis of the method of the present application, to realize the target of stable production for 4.5 years, the reasonable working system of the well is about 53*104 m3 / d, which is consistent with Figure 11 Figure 11 ​​​More consistent, further indicates the effectiveness and reliability of the present patent.

[0096] The reasonable production allocation method of the present application effectively supports the compilation of the 1.3 billion cubic meter production capacity construction scheme of the Xujiahe Formation gas reservoir in western Sichuan, and the 8 billion cubic meter production capacity stage target has been built at present, and the next step will continue to be applied to the evaluation and construction of the gas reservoir and other gas reservoirs, and it is expected to realize larger scale gas reservoir evaluation and construction.

[0097] Example 3

[0098] The present embodiment provides a reasonable production allocation system for tight gas reservoir gas wells based on a stable production period, which is used to execute the aforementioned reasonable production allocation method for gas reservoirs based on a stable production period, and the device comprises:

[0099] An acquisition module is configured to acquire production-time data of a target gas well;

[0100] A first processing module is configured to arrange the production-time data obtained by the acquisition module according to the size of the production in a power reduction manner;

[0101] A first calculation module is configured to calculate the production data arranged in a power reduction manner obtained by the first processing module to obtain material balance time-production data, and obtain a maximum material balance time according to the material balance time-production data;

[0102] A second calculation module is configured to judge the relationship between the stable production time and the maximum material balance time, if the stable production time is less than or equal to the maximum material balance time, then the stable production time is substituted into the material balance time data to obtain a reasonable working system of the target gas well at the stable production time according to the material balance time-production data; if the stable production time is greater than the maximum material balance time, the production-time data of the target gas well in step S1 is updated, and steps S1-S3 are executed to obtain the reasonable working system of the target gas well at the stable production time.

[0103] In addition to the above-mentioned embodiments, the present embodiment also provides an electronic device, which comprises a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor communicates with the memory through the bus, and the machine readable instructions are executed by the processor to realize the above-mentioned reasonable production allocation method for tight gas reservoir gas wells based on a stable production period.

[0104] In practical application, the electronic device can further comprise a display unit, which is configured to display various data and graphs in the above-mentioned reasonable production allocation device for gas reservoirs based on a stable production period, such as production-time data, material balance time-production data, stable production time, etc.

[0105] The embodiment further provides a computer readable storage medium, and the computer readable storage medium stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to realize the above-mentioned method for reasonably distributing production of a gas well in a compact gas reservoir based on a stable production period.

[0106] In addition, each functional module in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0107] If the above functions are realized in the form of software functional modules and sold or used as independent products, the software functional modules can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts that essentially contribute to the related art or the parts of the technical solutions can be embodied in the form of a software product.

[0108] The above merely provides the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for rational production allocation of gas wells in tight gas reservoirs based on the stable production period, characterized in that, Includes the following steps: Step S1: Obtain the production-time data of the target gas well, and sort the production-time data in descending order of production size; Step S2: Calculate the mass balance time-mass balance data from the power-reduced output data; obtain the maximum mass balance time based on the mass balance time-mass balance data. Step S3: Determine the relationship between stable production time and maximum material balance time. If stable production time is less than or equal to maximum material balance time, substitute stable production time into material balance time data based on material balance time-production data to obtain the reasonable operating regime of the target gas well under stable production time. If the stable production time is greater than the maximum material balance time, update the production-time data of the target gas well in step S1, and execute steps S1-S3 to obtain the reasonable operating regime of the target gas well under the stable production time.

2. The method for rational production allocation of tight gas reservoir wells based on the stable production period according to claim 1, characterized in that, In step S1, the production-time data of the gas well is obtained based on the static and dynamic data of the gas reservoir.

3. The method for rational production allocation of tight gas reservoir wells based on the stable production period according to claim 1, characterized in that, Before sorting the production-time data in descending order, the production-time data is preprocessed. The preprocessing includes removing data points with a production rate of less than 100% and / or data points with a production output lower than the scrap output.

4. The method for rational production allocation of tight gas reservoir wells based on the stable production period according to claim 1, characterized in that, When the stable production time is used as the material balance time, if there is no data point in the material balance time-output data where the material balance time equals the stable production time, the two material balance times closest to the stable production time are selected, and the average output corresponding to the output of the two material balance times is used as the reasonable production allocation system.

5. The method for rational production allocation of tight gas reservoir wells based on the stable production period according to any one of claims 1-4, characterized in that, In step S3, if the stable production time is greater than the maximum material balance time, when the production of the target gas well is in the declining period, the production of the target gas well is predicted using the declining model, the production-time data of the target gas well in step S1 is updated, and steps S1-S3 are executed to obtain the reasonable operating system of the target gas well under the stable production time. When the production of the target gas well is not in a declining period, a standard gas well is selected in the work area, and the production-time data of the target gas well in step S1 is updated according to the production-time data of the standard gas well. Steps S1-S3 are then executed to determine the reasonable operating system of the target gas well under the stable production time.

6. The method for rational production allocation of tight gas reservoir wells based on the stable production period according to claim 5, characterized in that, When a gas well is in a declining phase, the production rate is predicted using the original gas well data and the Arps declining model. The original data and the prediction results are combined to form the production-time data of the target gas well, which is then updated to the production-time data of the target gas well in step S1.

7. The method for rational production allocation of tight gas reservoir wells based on the stable production period according to claim 5, characterized in that, The criteria for selecting the standard gas well are: the unobstructed flow rate of the standard gas well differs from that of the target gas well by no more than 5 × 10⁻⁶. 4 m 3 / d.

8. A rational production allocation system for tight gas reservoir wells based on the stable production period, characterized in that, The system includes: The acquisition module is used to acquire production-time data for the target gas well; The first processing module is used to sort the output-time data obtained by the acquisition module in descending order of output size. The first calculation module is used to calculate the mass balance time-production data from the power-reduced production data obtained by the first processing module, and to obtain the maximum mass balance time based on the mass balance time-production data. The second calculation module is used to determine the relationship between the stable production time and the maximum material balance time. If the stable production time is less than or equal to the maximum material balance time, the stable production time is substituted into the material balance time data according to the material balance time-production data to obtain the reasonable operating regime of the target gas well under the stable production time. If the stable production time is greater than the maximum material balance time, the production-time data of the target gas well in step S1 is updated, and steps S1-S3 are executed to obtain the reasonable operating regime of the target gas well under the stable production time.

9. An electronic device, the electronic device comprising: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus, and the machine-readable instructions are executed by the processor to implement the rational production allocation method for tight gas reservoir wells based on the stable production period as described in any one of claims 1-7.

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