Method and apparatus for evaluating production of a condensate gas reservoir

Abstract

The application provides a method and device for evaluating exploitation of a condensate gas reservoir, which comprises the following steps: obtaining production data of an exploitation well of the condensate gas reservoir, and obtaining a first corresponding relationship between a production gas-oil ratio and a recovery degree of condensate oil of the condensate gas reservoir at different values of a recovery rate according to cumulative gas production and cumulative oil production of the condensate gas reservoir from a production date to each statistical time in the production data; determining a second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of condensate oil according to the actual recovery degree of condensate oil of the condensate gas reservoir from the production date to each statistical time and the actual production gas-oil ratio in each statistical time in the production data; and obtaining an exploitation condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship at different values of the recovery rate, so that the exploitation effect can be accurately evaluated for the condensate gas reservoir in a cyclic gas injection exploitation mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas reservoir development, and particularly relates to a method and device for evaluating exploitation of a condensate gas reservoir. BACKGROUND

[0002] At present, a condensate gas reservoir is exploited by a cyclic gas injection exploitation method to obtain condensate oil in the condensate gas reservoir. The cyclic gas injection exploitation method is to inject gas into a production well of the condensate gas reservoir to maintain formation pressure and reduce retrograde condensation, thereby exploiting the condensate oil. However, the injected gas is dry gas, and the mobility of the dry gas is greater than that of reservoir fluid in the condensate gas reservoir. Under the action of a differential pressure in the production well, a seepage channel is easily formed, which causes gas channeling in the production well of the condensate gas reservoir, affects the productivity and recovery of the production well of the condensate gas reservoir, and reduces the exploitation effect of the condensate gas reservoir. Therefore, it is urgent to accurately evaluate the exploitation effect of the condensate gas reservoir in the exploitation process of the cyclic gas injection exploitation method. SUMMARY

[0003] The present application provides a method and device for evaluating exploitation of a condensate gas reservoir to accurately evaluate the exploitation effect of the condensate gas reservoir in the exploitation process of the cyclic gas injection exploitation method.

[0004] In a first aspect, the present application provides a method for evaluating exploitation of a condensate gas reservoir, comprising:

[0005] obtaining production data of a production well of the condensate gas reservoir, wherein the production data comprises cumulative gas production, cumulative oil production, actual recovery degree of condensate oil, and actual production gas-oil ratio of each statistical time of the condensate gas reservoir from a production date to each statistical time;

[0006] obtaining a first corresponding relationship between a production gas-oil ratio and a recovery degree of condensate oil under different values of recovery of the condensate gas reservoir according to the cumulative gas production, the cumulative oil production, the actual recovery degree of condensate oil, and the actual production gas-oil ratio of each statistical time of the condensate gas reservoir from the production date to each statistical time;

[0007] determining a second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of condensate oil according to the actual recovery degree of condensate oil, and the actual production gas-oil ratio of each statistical time of the condensate gas reservoir from the production date to each statistical time;

[0008] obtaining an exploitation condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship under different values of recovery.

[0009] Optionally, the first corresponding relationship between the production gas-oil ratio and the recovery degree of condensate oil under different values of recovery of the condensate gas reservoir is obtained according to the cumulative gas production, the cumulative oil production, the actual recovery degree of condensate oil, and the actual production gas-oil ratio of each statistical time of the condensate gas reservoir from the production date to each statistical time, and comprises:

[0010] According to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time, a third correspondence relationship among the recovery rate of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil is obtained.

[0011] The recovery rate of the condensate gas reservoir in the third correspondence relationship is given different values, and a first correspondence relationship among the production gas-oil ratio and the recovery degree of the condensate oil under different values of the recovery rate of the condensate gas reservoir is obtained.

[0012] Optionally, the third correspondence relationship among the recovery rate of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil is obtained according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time, and includes:

[0013] According to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time, a fourth correspondence relationship between the cumulative gas production and the cumulative oil production is obtained.

[0014] According to the fourth correspondence relationship, a third correspondence relationship among the recovery rate of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil is obtained.

[0015] Optionally, the fourth correspondence relationship between the cumulative gas production and the cumulative oil production is represented by the following formula one:

[0016] lnG P =A+BN p Formula one

[0017] wherein G P represents the cumulative gas production, unit m 3 , N p represents the cumulative oil production, unit m 3 , and A and B are fitting constants.

[0018] Optionally, the third correspondence relationship among the recovery rate of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil is obtained according to the fourth correspondence relationship, and includes:

[0019] The ratio of the production gas-oil ratio to B is taken as the cumulative gas production, and the product of the geological reserves of the condensate oil and the recovery degree of the condensate oil is taken as the cumulative oil production, and the formula one is used to obtain the following formula two:

[0020] lnR s =lnB+A+BN o R o Formula two

[0021] wherein R s represents the production gas-oil ratio, N o represents the geological reserves of the condensate oil, unit m 3 , and Ro represents the recovery factor of the condensate gas reservoir, unit is %, A and B are fitting constants;

[0022] The limit production gas-oil ratio of the condensate gas reservoir is taken as the production gas-oil ratio, and the recovery factor of the condensate gas reservoir is taken as the recovery degree of the condensate oil, so Formula Three is obtained according to Formula Two:

[0023] lnR sl = lnB + A + BN o R m Formula Three

[0024] wherein, R sl represents the limit production gas-oil ratio of the condensate gas reservoir, N o represents the geological reserves of the condensate oil, unit is m 3 , R m represents the recovery factor of the condensate gas reservoir, unit is %, A and B are fitting constants;

[0025] According to Formula Two and Formula Three, a third corresponding relationship between the recovery factor of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil is obtained;

[0026] The third corresponding relationship is represented by Formula Four:

[0027] lnR s =B×N o ×(R o -R m )+lnR sl Formula Four

[0028] wherein, R s represents the production gas-oil ratio, N o represents the geological reserves of the condensate oil, unit is m 3 , R o represents the recovery degree of the condensate oil, unit is %, R m represents the recovery factor of the condensate gas reservoir, unit is %, R sl represents the limit production gas-oil ratio of the condensate gas reservoir, A and B are fitting constants.

[0029] Optionally, the mining status of the condensate gas reservoir is obtained according to the second corresponding relationship and the first corresponding relationship under different values of the recovery factor, comprising:

[0030] According to the first corresponding relationship under different values of the recovery factor, a first change curve of the production gas-oil ratio under different values of the recovery factor changing with the recovery degree of the condensate oil is obtained;

[0031] According to the second corresponding relationship, a second change curve of the actual production gas-oil ratio changing with the actual recovery degree of the condensate oil is obtained;

[0032] According to the second change curve of the actual production gas-oil ratio changing with the actual recovery degree of the condensate oil and the first change curve of the production gas-oil ratio changing with the recovery degree of the condensate oil at different recovery efficiencies, the exploitation condition of the condensate gas reservoir is obtained.

[0033] Optionally, the obtaining of the exploitation condition of the condensate gas reservoir according to the second change curve of the actual production gas-oil ratio changing with the actual recovery degree of the condensate oil and the first change curve of the production gas-oil ratio changing with the recovery degree of the condensate oil at different recovery efficiencies comprises:

[0034] If the first mode change line in the second change curve has a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual recovery degree smaller than a first preset change rate, and the first mode change line is closest to the first change curve with the recovery efficiency being a first value, the exploitation condition of the condensate gas reservoir in the exploitation period corresponding to the first mode change line is determined to be good, and the first value is greater than 0.5;

[0035] If the second mode change line in the second change curve has the actual production gas-oil ratio increasing with the actual recovery degree of the condensate oil, the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual recovery degree in the second mode change line is greater than the first preset change rate and smaller than a second preset change rate, and the end point of the second mode change line is closest to the first change curve with the recovery efficiency being a second value, the exploitation condition of the condensate gas reservoir in the exploitation period corresponding to the second mode change line is determined to have a slow gas channeling phenomenon, the second value is greater than the first value, and the first preset change rate is smaller than the second preset change rate;

[0036] If the third mode change line in the second change curve has the actual production gas-oil ratio increasing with the actual recovery degree of the condensate oil, the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual recovery degree in the third mode change line is greater than the second preset change rate, and the end point of the third mode change line is closest to the first change curve with the recovery efficiency being a third value, the exploitation condition of the condensate gas reservoir is determined to have a serious gas channeling phenomenon, and the third value is smaller than the second value.

[0037] In a second aspect, the present application provides a device for evaluating the exploitation of a condensate gas reservoir, comprising:

[0038] A first obtaining module is configured to obtain production data of a production well of the condensate gas reservoir, the production data comprising: cumulative gas production, cumulative oil production, actual recovery degree of the condensate oil, and actual production gas-oil ratio of the condensate gas reservoir from a production date to each statistical time.

[0039] The second obtaining module is configured to obtain a first corresponding relationship between a production gas-oil ratio and a recovery degree of condensate oil of the condensate gas reservoir at different values of the recovery ratio according to cumulative gas production and cumulative oil production of the condensate gas reservoir from a production date to each statistical time.

[0040] The determining module is configured to determine a second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of condensate oil according to the actual recovery degree of condensate oil of the condensate gas reservoir from the production date to each statistical time and the actual production gas-oil ratio in each statistical time.

[0041] The processing module is configured to obtain the exploitation condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship at different values of the recovery ratio.

[0042] Optionally, the second obtaining module is specifically configured to:

[0043] obtain a third corresponding relationship between the recovery ratio, the production gas-oil ratio and the recovery degree of condensate oil of the condensate gas reservoir according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time.

[0044] assign different values to the recovery ratio of the condensate gas reservoir in the third corresponding relationship to obtain the first corresponding relationship between the production gas-oil ratio and the recovery degree of condensate oil of the condensate gas reservoir at different values of the recovery ratio.

[0045] Optionally, the second obtaining module is specifically configured to:

[0046] obtain a fourth corresponding relationship between the cumulative gas production and the cumulative oil production according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time.

[0047] obtain the third corresponding relationship between the recovery ratio, the production gas-oil ratio and the recovery degree of condensate oil of the condensate gas reservoir according to the fourth corresponding relationship.

[0048] Optionally, the fourth corresponding relationship between the cumulative gas production and the cumulative oil production is represented by the following formula one:

[0049] lnG P =A+BN p Formula one

[0050] wherein G P represents the cumulative gas production, unit m 3 , N p represents the cumulative oil production, unit m 3 , and A and B are fitting constants.

[0051] Optionally, the second obtaining module is specifically configured to:

[0052] The ratio of the production gas-oil ratio to the B is taken as the cumulative gas production, and the product of the geological reserves of condensate and the recovery degree of condensate is taken as the cumulative oil production, to obtain Formula Two from Formula One:

[0053] lnR s = lnB + A + BN o R o Formula Two

[0054] wherein R s represents the production gas-oil ratio, N o represents the geological reserves of condensate, in m 3 , R o represents the recovery degree of condensate, in %, and A and B are fitting constants;

[0055] The ultimate production gas-oil ratio of the condensate gas reservoir is taken as the production gas-oil ratio, and the recovery factor of the condensate gas reservoir is taken as the recovery degree of condensate, to obtain Formula Three from Formula Two:

[0056] lnR sl = lnB + A + BN o R m Formula Three

[0057] wherein R sl represents the ultimate production gas-oil ratio of the condensate gas reservoir, N o represents the geological reserves of condensate, in m 3 , R m represents the recovery factor of the condensate gas reservoir, in %, and A and B are fitting constants;

[0058] According to Formula Two and Formula Three, a third correspondence between the recovery factor of the condensate gas reservoir, the production gas-oil ratio, and the recovery degree of condensate is obtained;

[0059] The third correspondence is represented by Formula Four:

[0060] lnR s = B x N o x (R o - R m ) + lnR sl Formula Four

[0061] wherein R s represents the production gas-oil ratio, N o represents the geological reserves of condensate, in m 3 , R o represents the recovery degree of condensate, in %, R m represents the recovery factor of the condensate gas reservoir, in %, and R slA and B are fitting constants.

[0062] Optionally, the processing module is specifically configured to:

[0063] According to the first corresponding relationship at different values of the recovery factor, a first change curve of the production gas-oil ratio changing with the produced degree of the condensate oil at different values of the recovery factor is obtained.

[0064] According to the second corresponding relationship, a second change curve of the actual production gas-oil ratio changing with the actual produced degree of the condensate oil is obtained.

[0065] According to the second change curve of the actual production gas-oil ratio changing with the actual produced degree of the condensate oil and the first change curve of the production gas-oil ratio changing with the produced degree of the condensate oil at different values of the recovery factor, the exploitation condition of the condensate gas reservoir is obtained.

[0066] Optionally, the processing module is specifically configured to:

[0067] If the first mode change line in the second change curve has a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual produced degree that is less than a first preset change rate, and the first mode change line is closest to the first change curve at the first value of the recovery factor, it is determined that the exploitation condition of the condensate gas reservoir in the exploitation period corresponding to the first mode change line is good, and the first value is greater than 0.5.

[0068] If the second mode change line in the second change curve has the actual production gas-oil ratio increasing with the actual produced degree of the condensate oil, the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual produced degree in the second mode change line is greater than the first preset change rate and less than a second preset change rate, and the end point of the second mode change line is closest to the first change curve at the second value of the recovery factor, it is determined that the exploitation of the condensate gas reservoir in the exploitation period corresponding to the second mode change line has a slow gas channeling phenomenon, the second value is greater than the first value, and the first preset change rate is less than the second preset change rate.

[0069] If the third mode change line in the second change curve has the actual production gas-oil ratio increasing with the actual produced degree of the condensate oil, the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual produced degree in the third mode change line is greater than the second preset change rate, and the end point of the third mode change line is closest to the first change curve at the third value of the recovery factor, it is determined that the exploitation of the condensate gas reservoir has a serious gas channeling phenomenon, and the third value is less than the second value.

[0070] In a third aspect, the present application provides a device for evaluating exploitation of a condensate gas reservoir, comprising a memory and a processor.

[0071] The memory is configured to store program instructions.

[0072] The processor is configured to invoke the program instructions in the memory to execute the method for evaluating exploitation of a condensate gas reservoir according to the first aspect of the present application.

[0073] In a fourth aspect, the present application provides a computer readable storage medium, which stores computer program instructions, and the computer program instructions are executed to implement the method for evaluating exploitation of a condensate gas reservoir according to the first aspect of the present application.

[0074] The method and device for evaluating exploitation of a condensate gas reservoir provided by the present application can obtain the first corresponding relationship between the production gas-oil ratio and the recovery degree of condensate oil of the condensate gas reservoir under different recovery values by obtaining the production data of the exploitation well of the condensate gas reservoir, and obtaining the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the commissioning day to each statistical time in the production data, determine the second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of condensate oil by obtaining the actual recovery degree of condensate oil of the condensate gas reservoir from the commissioning day to each statistical time and the actual production gas-oil ratio in each statistical time in the production data, and obtain the exploitation condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship under different recovery values. In this way, the exploitation effect can be accurately evaluated for the condensate gas reservoir in the cyclic gas injection exploitation mode, technical support is provided for the gas drive development effect evaluation of the condensate gas field, including evaluating the gas channeling degree and quantifying the relationship between the gas channeling and the recovery degree, so that optimization measures can be taken in time, the effect of the optimization measures is evaluated, economic benefits are improved, and the yield and stable production of the condensate gas field are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0075] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0076] Figure 1 The flowchart of the method for evaluating exploitation of a condensate gas reservoir provided by an embodiment of the present application is provided.

[0077] Figure 2 The flowchart of the method for evaluating exploitation of a condensate gas reservoir provided by another embodiment of the present application is provided.

[0078] Figure 3A corresponding relation diagram of cumulative gas production and cumulative oil production of a condensate gas reservoir from a production date to each statistical time provided by an embodiment of the present application is provided.

[0079] Figure 4 A corresponding relation diagram of a production gas-oil ratio and a condensate oil recovery factor of a condensate gas reservoir under different recovery factors provided by an embodiment of the present application is provided.

[0080] Figure 5 A corresponding relation diagram of an actual condensate oil recovery factor from a production date to each statistical time and an actual production gas-oil ratio in each statistical time provided by an embodiment of the present application is provided.

[0081] Figure 6 A structure schematic diagram of a condensate gas reservoir exploitation evaluation device provided by an embodiment of the present application is provided.

[0082] Figure 7 A structure schematic diagram of a condensate gas reservoir exploitation evaluation device provided by an embodiment of the present application is provided.

[0083] Figure 8 A structure schematic diagram of a condensate gas reservoir exploitation evaluation device provided by an embodiment of the present application is provided. DETAILED DESCRIPTION

[0084] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0085] The condensate gas reservoir is exploited by a cyclic gas injection exploitation method to obtain condensate oil in the condensate gas reservoir. However, the injected gas in the cyclic gas injection exploitation method is dry gas, and the mobility of the dry gas is greater than that of the reservoir fluid in the condensate gas reservoir. Under the action of a differential pressure in a production well, a percolation channel is easily formed, and a gas channeling phenomenon occurs in the production well of the condensate gas reservoir, which will affect the productivity and recovery factor of the production well of the condensate gas reservoir and reduce the exploitation effect of the condensate gas reservoir.

[0086] The application provides a method and device for evaluating exploitation of a condensate gas reservoir. The method comprises the following steps: obtaining production data of an exploitation well of the condensate gas reservoir; obtaining a first corresponding relationship between a production gas-oil ratio and a recovery degree of condensate oil of the condensate gas reservoir at different recovery efficiencies according to cumulative gas production and cumulative oil production of the condensate gas reservoir from a production date to each statistical time in the production data; determining a second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of condensate oil according to the actual recovery degree of condensate oil from the production date to each statistical time and the actual production gas-oil ratio in each statistical time in the production data; and obtaining an exploitation condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship at different recovery efficiencies. In this way, the exploitation effect of the condensate gas reservoir in a cyclic gas injection exploitation mode can be accurately evaluated, the economic benefit of the condensate gas field is improved, and the yield and stability of the condensate gas field are ensured.

[0087] Figure 1 A flowchart of a method for evaluating exploitation of a condensate gas reservoir is provided in an embodiment of the application. The method in the embodiment can be applied to an electronic device, which can be a terminal device, a server, or the like. The terminal device can be a mobile phone, a tablet computer, a notebook computer, a desktop computer, or the like, for example. As shown in FIG. 1, the method in the embodiment comprises the following steps. Figure 1

[0088] In S101, production data of an exploitation well of the condensate gas reservoir is obtained. The production data comprises cumulative gas production, cumulative oil production, an actual recovery degree of condensate oil, and an actual production gas-oil ratio in each statistical time from a production date of the condensate gas reservoir.

[0089] In the embodiment, the cumulative gas production of the condensate gas reservoir is obtained by adding daily gas production from the production date to each statistical time, the cumulative oil production of the condensate gas reservoir is obtained by adding daily oil production from the production date to each statistical time, the actual recovery degree of condensate oil is a ratio of actual cumulative oil production to actual geological reserves of condensate oil, and the actual production gas-oil ratio in each statistical time is a ratio of unit time gas production to unit time oil production in each statistical time. Optionally, the unit time can be a day, which is not limited in the application.

[0090] Optionally, each statistical time can be a month, and each month from the production date can be a month in which the production date is located to a month in which the current time is located, which is not limited in the application.

[0091] In the embodiment, the cumulative gas production, the cumulative oil production, the actual recovery degree of condensate oil, and the actual production gas-oil ratio in each statistical time from the production date of the condensate gas reservoir can be input by a user to an electronic device executing the method, or be sent by another device to the electronic device executing the method.​

[0092] S102, according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time, a first correspondence between the production gas-oil ratio and the recovery degree of the condensate oil under different values of the recovery ratio of the condensate gas reservoir is obtained.

[0093] In this embodiment, according to different values of the recovery ratio of the condensate gas reservoir, the correspondence between the production gas-oil ratio and the recovery degree of the condensate oil can be obtained, and therefore, according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time, the correspondence between the production gas-oil ratio and the recovery degree of the condensate oil under different values of the recovery ratio of the condensate gas reservoir is obtained, which is defined as the first correspondence.

[0094] S103, according to the actual recovery degree of the condensate oil of the condensate gas reservoir from the production date to each statistical time and the actual production gas-oil ratio in each statistical time, a second correspondence between the actual production gas-oil ratio and the actual recovery degree of the condensate oil is determined.

[0095] In this embodiment, there is a correspondence between the production gas-oil ratio of the condensate gas reservoir and the recovery degree of the condensate oil, and therefore, according to the actual recovery degree of the condensate oil of the condensate gas reservoir from the production date to each statistical time and the actual production gas-oil ratio in each statistical time, the correspondence between the actual production gas-oil ratio and the actual recovery degree of the condensate oil is determined, which is defined as the second correspondence.

[0096] It should be noted that the execution order of S102 and S103 is not limited in the embodiments of the present application.

[0097] S104, according to the second correspondence and the first correspondence under different values of the recovery ratio, the development status of the condensate gas reservoir is obtained.

[0098] In this embodiment, according to the different recovery ratios in the first correspondence, the production gas-oil ratio under different recovery ratios and the recovery degree of the condensate oil, and the actual production gas-oil ratio and the actual recovery degree of the condensate oil in the second correspondence, the development status of the condensate gas reservoir is obtained.

[0099] Optionally, after obtaining the development status of the condensate gas reservoir, the development status of the condensate gas reservoir can be output, such as displaying the development status of the condensate gas reservoir, or sending the development status of the condensate gas reservoir to a terminal device to display the development status of the condensate gas reservoir by the terminal device.

[0100] The application provides a method for evaluating exploitation of a condensate gas reservoir. The method comprises the following steps: obtaining production data of a production well of the condensate gas reservoir, wherein the production data comprises cumulative gas production, cumulative oil production, actual recovery degree of condensate oil, and actual production gas-oil ratio of each statistical time since the production well is put into production; obtaining a first corresponding relationship between the production gas-oil ratio and the recovery degree of condensate oil under different recovery efficiencies of the condensate gas reservoir according to the cumulative gas production and the cumulative oil production since the production well is put into production; determining a second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of condensate oil according to the actual recovery degree of condensate oil since the production well is put into production and the actual production gas-oil ratio of each statistical time; and obtaining the exploitation condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship under different recovery efficiencies. In this way, the exploitation effect of the condensate gas reservoir under the cyclic gas injection exploitation mode can be accurately evaluated, technical support for the gas drive development effect evaluation of the condensate gas field is provided, the degree of gas channeling is evaluated, the relationship between the gas channeling and the recovery degree is quantified, and thus the optimization measures can be taken in time, the effect of the optimization measures is evaluated, the economic benefits are improved, and the yield and the stable production of the condensate gas field are ensured.

[0101] In Figure 1 some embodiments, the method for evaluating exploitation of a condensate gas reservoir provided by another embodiment of the application comprises the following steps: Figure 2 As shown in the flowchart of the method for evaluating exploitation of a condensate gas reservoir provided by another embodiment of the application, the method can comprise the following steps: Figure 2

[0102] S201, obtaining production data of a production well of the condensate gas reservoir, wherein the production data comprises cumulative gas production, cumulative oil production, actual recovery degree of condensate oil, and actual production gas-oil ratio of each statistical time since the production well is put into production.

[0103] In this embodiment, the specific implementation process of S201 can refer to the related description of the embodiment shown in Figure 1 , and details are not described herein.

[0104] S202, obtaining a fourth corresponding relationship between the cumulative gas production and the cumulative oil production according to the cumulative gas production and the cumulative oil production since the production well is put into production.

[0105] In this embodiment, according to the experience statistical results of a large amount of actual production data of gas reservoirs, it is found that the cumulative gas production G P and the cumulative oil production N p are close to a straight line in a semi-logarithmic coordinate in the middle and late stages of the development of a gas drive gas reservoir. Therefore, the fourth corresponding relationship between the cumulative gas production and the cumulative oil production is obtained according to the cumulative gas production and the cumulative oil production since the production well is put into production. ​

[0106] Optionally, the fourth correspondence between cumulative gas production and cumulative oil production is represented by the following formula:

[0107] lnG P =A+BN p Formula 1

[0108] Among them, G P This represents the cumulative gas production, in cubic meters (m³). 3 N p This represents the cumulative oil production, in cubic meters (m³). 3 A and B are fitting constants. For example: In a gas field developing condensate gas reservoir X through circulating gas injection, if the cumulative gas production G over a one-month statistical period... P It is 0.0213*10 8 m 3 Then lnG P The value is 14.57163254, if the cumulative oil production N p 0.124*10 4 t, where the density of the condensate oil in the condensate gas reservoir is 0.797 g / ml, and the cumulative oil production N p After converting the unit to "cubic meters", the cumulative oil production N is... p The value is 1556m 3 . Figure 3 A graph showing the relationship between cumulative gas production and cumulative oil production of a condensate gas reservoir from the date of commissioning to various statistical periods, provided as an embodiment of this application, is shown below. Figure 3 As shown, the cumulative gas production and cumulative oil production of the condensate gas reservoir from the date of commissioning to each statistical period are substituted into the formula lnG. P =A+BN p In the process, the cumulative gas production G was obtained. P and cumulative oil production N p Approximately a straight line in a semi-logarithmic coordinate system, linear regression was performed on data points from the later stages of production. Under the condition of satisfying the correlation requirement, the intercept A (fitting constant) of this line was found to be 21.6826, the slope B (fitting constant) was 0.0000001987, and the linear correlation coefficient R² (R²) was calculated. 2 The value of ) is 0.9915738876, and taking its square root yields a correlation coefficient R of 0.995778, which is close to 1, indicating the cumulative gas production G. P and cumulative oil production N p The correlation is good.

[0109] S203. Based on the fourth correspondence, obtain the third correspondence between the recovery rate, the production gas-oil ratio, and the recovery degree of condensate oil in the condensate gas reservoir.

[0110] In this embodiment, the fourth correspondence between cumulative gas production and cumulative oil production has been obtained, namely Formula 1. Therefore, based on the fourth correspondence, this embodiment obtains the third correspondence between the recovery rate of condensate gas reservoir, the gas-oil production ratio and the degree of condensate oil recovery.

[0111] Optionally, the ratio of the gas-oil production ratio to the fitting constant B is used as the cumulative gas production, and the product of the geological reserves of condensate oil and the degree of condensate oil recovery is used as the cumulative oil production. Formula 2 is obtained from Formula 1:

[0112] lnR s =lnB+A+BN o R o Formula 2

[0113] Among them, R s Indicates the gas-oil ratio in production, N o This indicates the geological reserves of condensate oil, in cubic meters (m³). 3 R o The percentage indicates the recovery rate of condensate oil, and A and B are fitting constants.

[0114] Specifically, when condensate gas reservoirs are underground, they manifest as condensate gas; when extracted to the surface, part of it exists as a gas, known as natural gas, and part exists as a liquid, known as condensate oil. o R represents the geological reserves of condensate oil that are extracted from condensate gas and brought to the surface. o This indicates the degree of condensate oil recovery after condensate gas is extracted and brought to the surface.

[0115] The results of differentiating both sides of Equation 1 with respect to time t are as follows:

[0116]

[0117] in, Expressed as daily gas production, This represents the daily condensate production, B is the fitting constant, and t is in days.

[0118] R s Substituting the gasoline production ratio (i.e., the ratio of daily gas production to daily condensate production) into Formula 5, we obtain G. P =R s / B.

[0119] Due to the unique characteristics of circulating gas injection condensate gas reservoirs, the wellhead production is a single gas phase (condensate gas) in the formation, but becomes a two-phase gas-liquid mixture (gas form: natural gas, liquid form: condensate oil) after production. Here, the influence of the produced gas phase natural gas is ignored, and N... o Defined as geological reserves of condensate oil, R oThe recovery degree of condensate oil is defined as the cumulative oil production N p , the geological reserves of condensate oil N o , the recovery degree of condensate oil R o , and the recovery degree of condensate oil R p = N o × R o .

[0120] Substituting G P = R s / B, N p = N o × R o into formula one, formula two is obtained.

[0121] Optionally, the limit production gas-oil ratio of the condensate gas reservoir is taken as the production gas-oil ratio, and the recovery of the condensate gas reservoir is taken as the recovery degree of condensate oil, and formula three is obtained from formula two:

[0122] lnR sl = lnB + A + BN o R m , formula three

[0123] wherein R sl represents the limit production gas-oil ratio of the condensate gas reservoir, N o represents the geological reserves of condensate oil, in m 3 , R m represents the recovery of the condensate gas reservoir, in %, and A and B are fitting constants.

[0124] Specifically, according to the actual production experience and economic benefit evaluation of the condensate gas reservoir, a limit condition is set for formula two, and the limit production gas-oil ratio R sl is set, which represents the limit economic production of oil at this time. The recovery R m of the condensate gas reservoir is the final recovery degree when the gas reservoir reaches the abandonment condition, and when the production gas-oil ratio reaches R sl , it is generally considered that R o = R m , that is, the recovery degree at this time is the largest, reaching the recovery, and the limit production gas-oil ratio R sl of the condensate gas reservoir is taken as R s in formula two, and the recovery R m of the condensate gas reservoir is taken as R o in formula two, so that formula three is obtained from formula two.

[0125] Optionally, according to the above formula two and formula three, a third corresponding relationship between the recovery of the condensate gas reservoir, the production gas-oil ratio, and the recovery degree of condensate oil is obtained. The third corresponding relationship is represented by formula four:

[0126] lnRs =B×N o ×(R o -R m )+lnR sl Formula 4

[0127] Among them, R s Indicates the gas-oil ratio in production, N o This indicates the geological reserves of condensate oil, in cubic meters (m³). 3 R o Indicates the degree of recovery of condensate oil, in percentage (R). m R represents the recovery rate of condensate gas reservoirs, in % (%). sl The limiting gas-oil ratio of a condensate gas reservoir is represented by A and B, which are fitting constants.

[0128] Specifically, subtract the expressions on both sides of the equal signs in Formula 2 and Formula 3 respectively, that is:

[0129] lnR s -lnR sl =lnB+A+BN o R o -lnB-A-BN o R m

[0130] After sorting, we can obtain Formula 4. Based on Formula 4, we can obtain the third correspondence between the recovery rate of condensate gas reservoirs, the production gas-oil ratio, and the degree of condensate oil recovery.

[0131] S204. Assign different values ​​to the recovery rate of the condensate gas reservoir in the third correspondence relationship to obtain the first correspondence relationship between the production gas-oil ratio and the degree of condensate oil recovery under different values ​​of the recovery rate of the condensate gas reservoir.

[0132] In this embodiment, according to Formula 4 corresponding to the third correspondence, the geological reserves N of condensate oil are... o Limiting production gas-oil ratio R sl Under known conditions, the recovery rate R of condensate gas reservoirs in Formula 4 is calculated. m By assigning different values, the production gas-oil ratio R can be obtained according to Formula 4. s and the recovery rate of condensate oil R o The correspondence. Figure 4 This application provides a diagram showing the relationship between the production gas-oil ratio and the degree of condensate oil recovery under different recovery rates in a condensate gas reservoir, using the recovery rate R... m Taking multiple values ​​between 0.1 and 1 as examples, this application does not limit the interval between these multiple values, such as... Figure 4 As shown, the 10 curves correspond to the recovery rate R. mThe values ​​are 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0, with a numerical interval of 0.1; for each recovery rate R... m The value of R represents the degree of recovery of condensate oil. o Take values ​​from 0 to R respectively. m This application does not limit the interval between multiple values, such as... Figure 4 As shown, each curve corresponds to a recovery rate R. m The value of corresponds to the recovery degree of multiple condensate oils, R. o The value of R o The values ​​are spaced at intervals of 0.1, which is the horizontal axis, representing the geological reserves N of condensate oil. o Limiting production gas-oil ratio R sl Under the known conditions, the production gas-oil ratio R is calculated according to Formula 4. s The vertical axis represents the ordinate. For example, given the geological reserves N of condensate oil... o The total volume is 18,056,300 tons, and the density of the condensate oil is 0.797 g / ml. Converting this to cubic meters, the nitrogen content is... o The value is 22655332m 3 Limiting production gas-oil ratio R sl Based on actual production experience and economic benefit evaluation of condensate gas reservoirs, the target depth is set at 15,000 m. 3 / t, R after unit conversion sl The value of B is 11955, and the value of B is 0.0000001987. According to Formula 4, we get: lnR s =4.5016×(R) o -R m )+9.3889. Assume R m The value is 0.3, R o If the values ​​are taken as 0, 0.1, 0.2, and 0.3 in sequence, then R can be obtained according to the above formula. s The corresponding values ​​are: 3097.716511, 4858.971002, 7621.613893, and 11955, according to R. m R o R s The value can be obtained. Figure 4 Chinese R m The curve with a value of 0.3. And so on, to obtain... Figure 4 Mid-oil recovery rate R m The other 9 curves corresponding to different values.

[0133] S205. Based on the actual recovery rate of condensate oil from the start of production of the condensate gas reservoir to each statistical time and the actual production gas-oil ratio during each statistical time, determine the second correspondence between the actual production gas-oil ratio and the actual recovery rate of condensate oil.

[0134] In this embodiment, the specific implementation process of S205 can refer to the related description of the embodiment shown in Figure 1

[0135] S206, according to the first corresponding relationship between the recovery factor at different values and the production gas-oil ratio, a first change curve of the production gas-oil ratio changing with the condensate recovery degree at different values of the recovery factor is obtained.

[0136] In this embodiment, according to the first corresponding relationship between the production gas-oil ratio and the condensate recovery degree at different values of the recovery factor of the condensate gas reservoir, a corresponding relationship graph between the production gas-oil ratio and the condensate recovery degree at different values of the recovery factor as shown in Figure 4

[0137] Optionally, after obtaining the first change curve at different values of the recovery factor, the first change curves are displayed, for example, the first change curves are displayed in the same graph.

[0138] S207, according to the second corresponding relationship, a second change curve of the actual production gas-oil ratio changing with the actual condensate recovery degree is obtained.

[0139] In this embodiment, Figure 5 The corresponding relationship graph between the actual condensate recovery degree from the production date to each statistical time and the actual production gas-oil ratio in each statistical time provided by an embodiment of the present application, according to the second corresponding relationship between the actual production gas-oil ratio and the actual condensate recovery degree of the condensate gas reservoir, obtains a corresponding relationship graph between the actual condensate recovery degree from the production date to each statistical time and the actual production gas-oil ratio in each statistical time as shown in Figure 5

[0140] Optionally, after obtaining the second change curve, the second change curve is displayed, for example, the second change curve and the first change curve are displayed in the same graph.

[0141] S208, according to the second change curve of the actual production gas-oil ratio changing with the actual condensate recovery degree, and the first change curve of the production gas-oil ratio changing with the condensate recovery degree at different values of the recovery factor, the exploitation condition of the condensate gas reservoir is obtained.

[0142] In this embodiment, the exploitation condition of the condensate gas reservoir can be determined by the association relationship between the second change curve and the first change curve.

[0143] ​​​Optionally, if the first morphological change line in the second change curve, the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio with the actual recovery degree in the first morphological change line is less than the first preset change rate, and the first morphological change line is closest to the first change curve with the recovery efficiency of the first value, it is determined that the condensate gas reservoir in the exploitation period corresponding to the first morphological change line has good exploitation condition, and the first value is greater than 0.5.

[0144] In the embodiment, specifically, the first preset change rate is 0.1, the first value is greater than 0.5 and less than 1, and the closer to 1 on the basis of greater than 0.5, the better the exploitation effect of the condensate gas reservoir. Taking a gas field cyclic gas injection development condensate gas reservoir Y as an example, the basic characteristic parameters of the gas reservoir are shown in Table 1.

[0145] Table 1 Basic characteristic parameters of the gas reservoir Y

[0146]

[0147] On the basis of the data in Table 1, the corresponding relationship between the actual recovery degree of the condensate oil of the gas reservoir Y from the production time to each statistical time and the actual production gas-oil ratio in each statistical time is obtained, which corresponds to the second change curve, as shown in Figure 5 The first morphological change line in the second change curve corresponds to the first dynamic, which indicates that in the early stage of the initial production of the gas reservoir Y from 2000 to 2002, the initial actual production gas-oil ratio coincides with the curve with the recovery efficiency of 0.5 in the first change curve, and with the increase of the actual recovery degree, the actual production gas-oil ratio does not show an upward trend, and the first morphological change line basically presents a horizontal straight line advancing to the right, i.e. the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio with the actual recovery degree in the first morphological change line is less than the first preset change rate 0.1; after two years of development, the recovery degree of the gas reservoir Y reaches 0.21, the first morphological change line coincides with the curve with the recovery efficiency of 0.7 in the first change curve, and the recoverable reserves are 1263.94×10 4 t. This indicates that in the early stage of the development, the cyclic gas injection effectively improves the ultimate recovery efficiency of the gas reservoir, and does not cause gas channeling, and the injection and exploitation effect is good, which is in the first dynamic.

[0148] Optionally, if the second morphological change line in the second change curve, the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio with the actual recovery degree in the second morphological change line is greater than the first preset change rate and less than the second preset change rate, and the end point of the second morphological change line is closest to the first change curve with the recovery efficiency of the second value, it is determined that the condensate gas reservoir in the exploitation period corresponding to the second morphological change line has slow gas channeling phenomenon, the second value is greater than the first value, and the first preset change rate is less than the second preset change rate.

[0149] Based on the above embodiments, specifically, the second preset rate of change is set to 0.3, which is greater than the first value and less than 1. For example... Figure 5 As shown, the second variation curve includes a second morphological variation line indicating the increase of the actual production gas-oil ratio as the actual recovery rate of condensate oil changes. Corresponding to the second dynamic, this indicates that from 2003 to 2014, with the further improvement of actual recovery rate, the actual production gas-oil ratio of gas reservoir Y began to gradually increase, but at a slow rate. Simultaneously, the rightward shift of the second morphological variation line also slowed down. That is, the rate of change of the ratio of the actual production gas-oil ratio to the limiting production gas-oil ratio in the second morphological variation line with the actual recovery rate was greater than the first preset rate of change (0.1) and less than the second preset rate of change (0.3). By 2014, the actual recovery rate of gas reservoir Y reached 0.5, and the second morphological variation line lay between the curves in the first variation curve with a recovery rate of 0.8 and 0.9, increasing the recoverable reserves of gas reservoir Y to 1534.78 × 10⁻⁶. 4 During this extraction phase (second dynamic), slow gas channeling begins to occur in the injected gas, and the gas injection extraction effect deteriorates compared to the earlier stages. However, under the effect of gas injection pressure maintenance to suppress anti-condensation and promote anti-evaporation, the final recovery rate of gas reservoir Y is still improved to a certain extent.

[0150] Optionally, if the second variation curve includes a third variation line where the actual production gas-oil ratio increases with the actual recovery rate of condensate oil, and the rate of change of the ratio of the actual production gas-oil ratio to the limiting production gas-oil ratio in the third variation line with the actual recovery rate is greater than the second preset rate of change, and the end point of the third variation line is closest to the first variation curve with the recovery rate of the third value, then it is determined that the exploitation of the condensate gas reservoir has a serious gas channeling phenomenon, and the third value is less than the second value.

[0151] Based on the above embodiments, such as Figure 5 As shown, the second variation curve includes a third-mode variation line where the actual production gas-oil ratio increases with the actual recovery rate of condensate oil. This corresponds to the third dynamic stage, indicating that the actual production gas-oil ratio of gas reservoir Y rapidly increased in a short period from 2015 to 2018. Specifically, the rate of change of the ratio of the actual production gas-oil ratio to the limiting production gas-oil ratio in the third-mode variation line with the actual recovery rate is greater than the second preset rate of 0.3. Furthermore, the third-mode variation line gradually shifts from a curve with a recovery rate of approximately 0.85 in the first variation curve to a curve with a recovery rate of 0.8 in the first variation curve. This indicates that severe gas channeling has begun to occur in the injected gas, leading to a significant decrease in condensate gas production and consequently a decrease in the final recovery rate, resulting in poor gas injection and extraction performance. Compared to the second dynamic stage, the actual production gas-oil ratio has increased by 90.28 × 10⁻⁶. 4 The loss of recoverable reserves; and if adjustments are not made soon, development will continue in this trend toward abandonment (Rt).s The final recoverable reserves will be 288.90 x 10 4 t.

[0152] Since 2019, due to the poor development effect, gas reservoir Y has been managed in 2018, and a series of injection-production structure adjustment and high gas-oil ratio gas channeling well measures have been taken in the whole gas reservoir. The specific measures include injection-production well pattern adjustment, separate layer gas injection, layer modification, and deployment of new wells in low well control degree parts, which are not limited here. For example Figure 5 The morphological change line in the fourth dynamic in the above formula presents a rightward translation trend, indicating that the exploitation effect has shown a good trend after taking measures, and the gas reservoir recovery is predicted to be 0.8, and the recoverable reserves are 1444.50 x 10 4 t.

[0153] The exploitation evaluation method of the condensate gas reservoir provided in the present application obtains the exploitation condition of the condensate gas reservoir according to the corresponding relationship between the actual recovery degree of the condensate oil of the condensate gas reservoir from the production date to each statistical time and the actual production gas-oil ratio in each statistical time. Through the above-mentioned way, the exploitation effect of the condensate gas reservoir in the cyclic gas injection exploitation mode can be accurately evaluated, technical support is provided for the condensate gas field gas drive development effect evaluation, including evaluating the gas channeling degree, quantifying the relationship between the gas channeling and the recovery degree, so as to be able to take optimization measures in time, and the effect of the taken optimization measures is evaluated, so as to improve the economic benefit and guarantee the yield increase and stable production of the condensate gas field.

[0154] Figure 6 The structure schematic diagram of the exploitation evaluation device of the condensate gas reservoir provided in an embodiment of the present application is shown in FIG. 6, which includes a first acquisition module 601, a second acquisition module 602, a determination module 603 and a processing module 604. Figure 6

[0155] The first acquisition module 601 is used for acquiring the production data of the exploitation well of the condensate gas reservoir, and the production data includes the cumulative gas production, the cumulative oil production, the actual recovery degree of the condensate oil of the condensate gas reservoir from the production date to each statistical time, and the actual production gas-oil ratio in each statistical time.

[0156] The second acquisition module 602 is used for obtaining the first corresponding relationship between the production gas-oil ratio and the recovery degree of the condensate oil of the condensate gas reservoir in different value under the recovery ratio of the condensate gas reservoir from the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time.

[0157] ​The determining module 603 is configured to determine a second correspondence between the actual production gas-oil ratio and the actual recovery degree of condensate oil according to the actual recovery degree of condensate oil of the condensate gas reservoir from a production date to each statistical time and the actual production gas-oil ratio in each statistical time.

[0158] The processing module 604 is configured to obtain the exploitation condition of the condensate gas reservoir according to the second correspondence and the first correspondence with different values of the recovery rate.

[0159] In the above embodiment, the second obtaining module 602 is specifically configured to:

[0160] obtain a third correspondence between the recovery rate, the production gas-oil ratio and the recovery degree of condensate oil of the condensate gas reservoir according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time;

[0161] obtain a first correspondence between the production gas-oil ratio and the recovery degree of condensate oil with different values of the recovery rate of the condensate gas reservoir.

[0162] In the above embodiment, the second obtaining module 602 is specifically configured to:

[0163] obtain a fourth correspondence between the cumulative gas production and the cumulative oil production according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time;

[0164] obtain a third correspondence between the recovery rate, the production gas-oil ratio and the recovery degree of condensate oil of the condensate gas reservoir according to the fourth correspondence.

[0165] In the above embodiment, the fourth correspondence between the cumulative gas production and the cumulative oil production is represented by the following formula one:

[0166] lnG P =A+BN p Formula one

[0167] wherein, G P represents the cumulative gas production, unit m 3 , N p represents the cumulative oil production, unit m 3 , and A and B are fitting constants.

[0168] In the above embodiment, the second obtaining module 602 is specifically configured to:

[0169] The ratio of the production gas-oil ratio to the B is taken as the cumulative gas production, and the product of the geological reserves of condensate and the recovery degree of condensate is taken as the cumulative oil production, to obtain Formula Two from Formula One:

[0170] lnR s = lnB + A + BN o R o Formula Two

[0171] wherein R s represents the production gas-oil ratio, N o represents the geological reserves of condensate, in m 3 , R o represents the recovery degree of condensate, in %, and A and B are fitting constants;

[0172] The ultimate production gas-oil ratio of the condensate gas reservoir is taken as the production gas-oil ratio, and the recovery factor of the condensate gas reservoir is taken as the recovery degree of condensate, to obtain Formula Three from Formula Two:

[0173] lnR sl = lnB + A + BN o R m Formula Three

[0174] wherein R sl represents the ultimate production gas-oil ratio of the condensate gas reservoir, N o represents the geological reserves of condensate, in m 3 , R m represents the recovery factor of the condensate gas reservoir, in %, and A and B are fitting constants;

[0175] According to Formula Two and Formula Three, a third correspondence between the recovery factor of the condensate gas reservoir, the production gas-oil ratio, and the recovery degree of condensate is obtained;

[0176] The third correspondence is represented by Formula Four:

[0177] lnR s = B x N o x (R o - R m ) + lnR sl Formula Four

[0178] wherein R s represents the production gas-oil ratio, N o represents the geological reserves of condensate, in m 3 , R o represents the recovery degree of condensate, in %, R m represents the recovery factor of the condensate gas reservoir, in %, R sl represents the ultimate production gas-oil ratio of the condensate gas reservoir, and A and B are fitting constants.

[0179] On the basis of any of the above-mentioned embodiments, the processing module 604 is specifically configured to:

[0180] According to the first corresponding relationship at different values of the recovery factor, a first change curve of the production gas-oil ratio changing with the produced degree of the condensate oil at different values of the recovery factor is obtained;

[0181] According to the second corresponding relationship, a second change curve of the actual production gas-oil ratio changing with the actual produced degree of the condensate oil is obtained;

[0182] According to the second change curve of the actual production gas-oil ratio changing with the actual produced degree of the condensate oil and the first change curve of the production gas-oil ratio changing with the produced degree of the condensate oil at different values of the recovery factor, the exploitation condition of the condensate gas reservoir is obtained.

[0183] On the basis of any of the above-mentioned embodiments, the processing module 604 is specifically configured to:

[0184] If the first mode change line in the second change curve has a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual produced degree smaller than a first preset change rate, and the first mode change line is closest to the first change curve with the recovery factor being a first value, the first value being greater than 0.5, it is determined that the exploitation condition of the condensate gas reservoir in the exploitation period corresponding to the first mode change line is good.

[0185] If the second mode change line in the second change curve has the actual production gas-oil ratio increasing with the actual produced degree of the condensate oil, the second mode change line has a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual produced degree greater than the first preset change rate and smaller than a second preset change rate, and an end point of the second mode change line is closest to the first change curve with the recovery factor being a second value, the second value being greater than the first value, and the first preset change rate being smaller than the second preset change rate, it is determined that the exploitation of the condensate gas reservoir in the exploitation period corresponding to the second mode change line has a slow gas channeling phenomenon.

[0186] If the third mode change line in the second change curve has the actual production gas-oil ratio increasing with the actual produced degree of the condensate oil, the third mode change line has a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual produced degree greater than the second preset change rate, and an end point of the third mode change line is closest to the first change curve with the recovery factor being a third value, the third value being smaller than the second value, it is determined that the exploitation of the condensate gas reservoir has a serious gas channeling phenomenon.

[0187] The device of the embodiment can be used to implement the technical solutions of any of the above-mentioned method embodiments, and has similar implementation principles and technical effects, which will not be described here again.

[0188] Figure 7 A structure diagram of a device for evaluating exploitation of a condensate gas reservoir is provided in an embodiment of the present application. Figure 7 As shown in the figure, the device 700 for evaluating exploitation of a condensate gas reservoir in the embodiment includes a memory 701 and a processor 702. The processor 701 and the memory 702 are connected through a bus.

[0189] The memory 701 is configured to store program instructions.

[0190] The processor 702 is configured to invoke the program instructions in the memory to perform the following steps:

[0191] obtain production data of a production well of the condensate gas reservoir, the production data including cumulative gas production, cumulative oil production, actual recovery degree of condensate oil, and actual production gas-oil ratio of the condensate gas reservoir from a production date to each statistical time; obtain a first corresponding relationship between production gas-oil ratio and recovery degree of condensate oil under different values of recovery rate of the condensate gas reservoir according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time; determine a second corresponding relationship between actual production gas-oil ratio and actual recovery degree of condensate oil according to the actual recovery degree of condensate oil of the condensate gas reservoir from the production date to each statistical time and the actual production gas-oil ratio in each statistical time; and obtain exploitation status of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship under different values of recovery rate.

[0192] Optionally, the processor 702 is specifically configured to:

[0193] obtain a third corresponding relationship between recovery rate of the condensate gas reservoir, production gas-oil ratio, and recovery degree of condensate oil according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time;

[0194] assign different values to the recovery rate of the condensate gas reservoir in the third corresponding relationship to obtain the first corresponding relationship between production gas-oil ratio and recovery degree of condensate oil under different values of recovery rate of the condensate gas reservoir.

[0195] Based on any of the above-mentioned embodiments, the processor 702 is specifically configured to:

[0196] obtain a fourth corresponding relationship between cumulative gas production and cumulative oil production according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time;

[0197] According to the fourth correspondence relationship, a third correspondence relationship between the recovery factor of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil is obtained.

[0198] Optionally, a fourth correspondence relationship between the cumulative gas production and the cumulative oil production is represented by the following formula one:

[0199] lnG P =A+BN p Formula one

[0200] wherein, G P represents the cumulative gas production, unit m 3 , N p represents the cumulative oil production, unit m 3 , and A and B are fitting constants.

[0201] On the basis of any of the above-mentioned embodiments, the processor 702 is specifically configured to:

[0202] obtain formula two from the formula one by taking the ratio of the production gas-oil ratio and the B as the cumulative gas production, and taking the product of the geological reserves of the condensate oil and the recovery degree of the condensate oil as the cumulative oil production:

[0203] lnR s =A+BN o R o Formula two

[0204] wherein, R s represents the production gas-oil ratio, N o represents the geological reserves of the condensate oil, unit m 3 , R o represents the recovery degree of the condensate oil, unit %, and A and B are fitting constants.

[0205] obtain formula three from the formula two by taking the limit production gas-oil ratio of the condensate gas reservoir as the production gas-oil ratio, and taking the recovery factor of the condensate gas reservoir as the recovery degree of the condensate oil:

[0206] lnR sl =A+BN o R m Formula three

[0207] wherein, R sl represents the limit production gas-oil ratio of the condensate gas reservoir, N o represents the geological reserves of the condensate oil, unit m 3 , R m represents the recovery factor of the condensate gas reservoir, unit %, and A and B are fitting constants.

[0208] According to the above Formula II and the Formula III, a third correspondence relationship between the recovery factor of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil is obtained;

[0209] The third correspondence relationship is represented by Formula IV:

[0210] lnR s =B×N o ×(R o -R m )+lnR sl Formula IV

[0211] wherein, R s represents the production gas-oil ratio, N o represents the geological reserves of the condensate oil, in units of m 3 , R o represents the recovery degree of the condensate oil, in units of %, R m represents the recovery factor of the condensate gas reservoir, in units of %, R sl represents the limit production gas-oil ratio of the condensate gas reservoir, and A and B are fitting constants.

[0212] On the basis of any of the above-mentioned embodiments, the processor 702 is specifically configured to:

[0213] According to the first correspondence relationship at different values of the recovery factor, a first change curve of the production gas-oil ratio changing with the recovery degree of the condensate oil at different values of the recovery factor is obtained;

[0214] According to the second correspondence relationship, a second change curve of the actual production gas-oil ratio changing with the actual recovery degree of the condensate oil is obtained;

[0215] According to the second change curve of the actual production gas-oil ratio changing with the actual recovery degree of the condensate oil and the first change curve of the production gas-oil ratio changing with the recovery degree of the condensate oil at different values of the recovery factor, the exploitation condition of the condensate gas reservoir is obtained.

[0216] On the basis of any of the above-mentioned embodiments, the processor 702 is specifically configured to:

[0217] If the first mode change line in the second change curve has a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio changing with the actual recovery degree smaller than a first preset change rate, and the first mode change line is closest to the first change curve with the recovery factor being a first value, the exploitation condition of the condensate gas reservoir in the exploitation period corresponding to the first mode change line is determined to be good, and the first value is greater than 0.5;

[0218] If the second variation curve contains a second morphological variation line in which the actual production gas-oil ratio increases with the actual recovery of condensate oil, and the rate of change of the ratio of the actual production gas-oil ratio to the limiting production gas-oil ratio in the second morphological variation line with the actual recovery rate is greater than the first preset rate of change and less than the second preset rate of change, and the end point of the second morphological variation line is closest to the first variation curve with the recovery rate of the second value, then it is determined that the condensate gas reservoir in the mining period corresponding to the second morphological variation line exhibits a slow gas channeling phenomenon, the second value is greater than the first value, and the first preset rate of change is less than the second preset rate of change.

[0219] If the second variation curve contains a third variation line in which the actual production gas-oil ratio increases with the actual recovery rate of condensate oil, and the rate of change of the ratio of the actual production gas-oil ratio to the limiting production gas-oil ratio in the third variation line with the actual recovery rate is greater than the second preset rate of change, and the end point of the third variation line is closest to the first variation curve with the recovery rate of the third value, then it is determined that the exploitation of the condensate gas reservoir has a serious gas channeling phenomenon, and the third value is less than the second value.

[0220] The apparatus of this embodiment can be used to execute the technical solutions of any of the method embodiments shown above. Its implementation principle and technical effect are similar, and will not be repeated here.

[0221] Figure 8 This is a schematic diagram of the structure of a condensate gas reservoir exploitation assessment device provided in one embodiment of this application, as shown below. Figure 8 As shown, for example, the condensate gas reservoir exploitation assessment device 800 can be provided as a server or computer. (See reference...) Figure 8 The apparatus 800 includes a processing component 801, which further includes one or more processors, and memory resources represented by memory 802 for storing instructions, such as application programs, that can be executed by the processing component 801. The application programs stored in memory 802 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 801 is configured to execute instructions to perform any of the method embodiments described above.

[0222] Device 800 may also include a power supply component 803 configured to perform power management of device 800, a wired or wireless network interface 804 configured to connect device 800 to a network, and an input / output (I / O) interface 805. Device 800 may operate on an operating system stored in memory 802, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, or similar.

[0223] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-mentioned method for evaluating the exploitation of condensate gas reservoirs.

[0224] The aforementioned computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0225] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Alternatively, the readable storage medium can be an integral part of the processor. Both the processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in a condensate gas reservoir exploitation and evaluation device.

[0226] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0227] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for evaluating production of a condensate gas reservoir under cyclic gas injection production, characterized by, The method comprises the following steps: obtaining production data of a production well of a condensate gas reservoir, the production data comprising cumulative gas production, cumulative oil production, actual recovery degree of condensate oil, and actual production gas-oil ratio of the condensate gas reservoir at each statistical time since the production well is put into production; obtaining a fourth corresponding relationship between the cumulative gas production and the cumulative oil production according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir at each statistical time since the production well is put into production; wherein the fourth corresponding relationship between the cumulative gas production and the cumulative oil production is represented by formula one: Formula One wherein, represents the cumulative gas production, units , represents the cumulative oil production, units , and are fitting constants; The cumulative gas production is obtained from the ratio of the production gas-oil ratio to the product of the condensate geological reserves and the condensate recovery factor. The cumulative gas production is obtained from the ratio of the production gas-oil ratio to the product of the condensate geological reserves and the condensate recovery factor. Equation Two wherein, represents the production gas-oil ratio, represents the geological reserves of condensate, in , represents the recovery factor of condensate, in , and are fitting constants; taking the limit production gas-oil ratio of the condensate gas reservoir as the production gas-oil ratio and taking the recovery rate of the condensate gas reservoir as the recovery degree of the condensate oil, obtaining formula three from formula two: Formula Three wherein, represents the limit production gas-oil ratio of the condensate gas reservoir, represents the geological reserves of condensate oil, unit , represents the recovery rate of the condensate gas reservoir, unit , and is a fitting constant; obtaining a third corresponding relationship between the recovery rate of the condensate gas reservoir, the production gas-oil ratio and the recovery degree of the condensate oil according to formula two and formula three; the third corresponding relationship is represented by formula four: Formula Four wherein, represents the producing gas-oil ratio, represents the geological reserves of condensate, in , represents the recovery factor of condensate, in , represents the recovery factor of the condensate gas reservoir, in , represents the limit producing gas-oil ratio of the condensate gas reservoir, and is a fitting constant; assigning different values to the recovery rate of the condensate gas reservoir in the third corresponding relationship to obtain a first corresponding relationship between the production gas-oil ratio and the recovery degree of the condensate oil under different values of the recovery rate of the condensate gas reservoir; determining a second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of the condensate oil according to the actual recovery degree of the condensate oil and the actual production gas-oil ratio of the condensate gas reservoir at each statistical time since the production well is put into production; obtaining the production condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship under different values of the recovery rate; the production condition of the condensate gas reservoir comprises whether the condensate gas reservoir has gas channeling and the severity of the gas channeling.

2. The method of claim 1, wherein, The method of obtaining the production condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship under different values of the recovery rate comprises: obtaining a first change curve of the production gas-oil ratio under different values of the recovery rate with the recovery degree of the condensate oil according to the first corresponding relationship under different values of the recovery rate; obtaining a second change curve of the actual production gas-oil ratio with the actual recovery degree of the condensate oil according to the second corresponding relationship; obtaining the production condition of the condensate gas reservoir according to the second change curve of the actual production gas-oil ratio with the actual recovery degree of the condensate oil and the first change curve of the production gas-oil ratio under different values of the recovery rate with the recovery degree of the condensate oil.

3. The method of claim 2, wherein, The method of obtaining the production condition of the condensate gas reservoir according to the second change curve of the actual production gas-oil ratio with the actual recovery degree of the condensate oil and the first change curve of the production gas-oil ratio under different values of the recovery rate with the recovery degree of the condensate oil comprises: if the second change curve contains a first mode change line, the change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio in the first mode change line with the actual recovery degree is less than a first preset change rate, and the first mode change line is closest to a first change curve with a first value of the recovery rate greater than 0.5, it is determined that the production condition of the condensate gas reservoir in the production period corresponding to the first mode change line is good. If the second change curve contains a second morphological change line in which the actual production gas-oil ratio increases with the actual recovery degree of the condensate oil, a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio with respect to the actual recovery degree in the second morphological change line is greater than a first preset change rate and less than a second preset change rate, and an end point of the second morphological change line is closest to the first change curve with the recovery ratio being a second value, it is determined that the recovery of the condensate gas reservoir in the recovery period corresponding to the second morphological change line has a slow gas channeling phenomenon, the second value is greater than the first value, and the first preset change rate is less than the second preset change rate. If the second change curve contains a third morphological change line in which the actual production gas-oil ratio increases with the actual recovery degree of the condensate oil, a change rate of the ratio of the actual production gas-oil ratio to the limit production gas-oil ratio with respect to the actual recovery degree in the third morphological change line is greater than the second preset change rate, and an end point of the third morphological change line is closest to the first change curve with the recovery ratio being a third value, it is determined that the recovery of the condensate gas reservoir has a serious gas channeling phenomenon, and the third value is less than the second value.

4. An apparatus for evaluating production of a condensate gas reservoir, characterized by, The method comprises: A first obtaining module is configured to obtain production data of a recovery well of a condensate gas reservoir, the production data comprising: cumulative gas production, cumulative oil production, actual recovery degree of condensate oil, and actual production gas-oil ratio of each statistical time of the condensate gas reservoir from a production date to each statistical time; A second obtaining module is configured to obtain a fourth corresponding relationship between cumulative gas production and cumulative oil production according to the cumulative gas production and the cumulative oil production of the condensate gas reservoir from the production date to each statistical time; wherein the fourth corresponding relationship between the cumulative gas production and the cumulative oil production is represented by Formula One: Formula One wherein, represents the cumulative gas production, units , represents the cumulative oil production, units , and is a fitting constant; The cumulative gas production is obtained from the ratio of the production gas-oil ratio to the product of the condensate geological reserves and the condensate recovery factor. The cumulative gas production is obtained from the ratio of the production gas-oil ratio to the product of the condensate geological reserves and the condensate recovery factor. Equation Two wherein, represents the production gas-oil ratio, represents the geological reserves of condensate, in million tons , represents the recovery factor of condensate, in percent , and are fitting constants; The limit production gas-oil ratio of the condensate gas reservoir is taken as the production gas-oil ratio, and the recovery ratio of the condensate gas reservoir is taken as the recovery degree of the condensate oil, and Formula Three is obtained from Formula Two: Equation Three wherein, represents the limit production gas-oil ratio of the condensate gas reservoir, represents the geological reserves of condensate oil, unit , represents the recovery rate of the condensate gas reservoir, unit , and is a fitting constant; According to the above Formula Two and Formula Three, a third corresponding relationship between the recovery ratio of the condensate gas reservoir, the production gas-oil ratio, and the recovery degree of the condensate oil is obtained; The third corresponding relationship is represented by Formula Four: Formula Four wherein, represents the producing gas-oil ratio, represents the geological reserves of condensate, in , represents the recovery factor of condensate, in , represents the recovery factor of the condensate gas reservoir, in , represents the limit producing gas-oil ratio of the condensate gas reservoir, and is a fitting constant; Different values are assigned to the recovery ratio of the condensate gas reservoir in the third corresponding relationship, and a first corresponding relationship between the production gas-oil ratio and the recovery degree of the condensate oil of the condensate gas reservoir under different values of the recovery ratio is obtained; A determining module is configured to determine a second corresponding relationship between the actual production gas-oil ratio and the actual recovery degree of the condensate oil according to the actual recovery degree of the condensate oil of the condensate gas reservoir from the production date to each statistical time and the actual production gas-oil ratio of each statistical time; A processing module is configured to obtain the recovery condition of the condensate gas reservoir according to the second corresponding relationship and the first corresponding relationship under different values of the recovery ratio.

5. An apparatus for evaluating production of a condensate gas reservoir, the apparatus comprising: The method comprises: A memory and a processor; The memory is configured to store program instructions; The processor is configured to call the program instructions in the memory to execute the method for evaluating the recovery of the condensate gas reservoir according to any one of claims 1-3.

6. A computer readable storage medium characterized in that, The computer readable storage medium stores computer program instructions, and the computer program instructions, when executed, implement the method for evaluating the exploitation of the gas condensate reservoir according to any one of claims 1 to 3.

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