CN114382465B - Method, device, terminal and storage medium for determining stable production age of gas well - Google Patents
Method, device, terminal and storage medium for determining stable production age of gas well Download PDFInfo
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Abstract
The application discloses a method, a device, a terminal and a storage medium for determining the stable production age of a gas well, and belongs to the field of oil and gas field development. The method comprises the following steps: acquiring accumulated gas yield and historical production data of a gas well at the beginning of a stable production period, determining a corresponding relation between bottom hole flow pressure and accumulated gas yield of the gas well based on the historical production data of the gas well, determining bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure of the gas well, determining accumulated gas yield of the gas well at the end of the stable production period based on the bottom hole flow pressure and the corresponding relation at the end of the stable production period, and determining the stable production period of the gas well based on the accumulated gas yield at the beginning of the stable production period, the accumulated gas yield at the end of the stable production period and the annual yield of the gas well at the stable production period. The application provides a method for quantitatively determining the stable yield period, which reduces the prediction error of the stable yield period and ensures that the determined stable yield period is more accurate.
Description
Technical Field
The application relates to the technical field of oil and gas field development, in particular to a method, a device, a terminal and a storage medium for determining the stable production age of a gas well.
Background
In evaluating the development of gas fields and gas wells, the stationary production age of a gas well is an important indicator, and the stationary production age of a gas well refers to a period of time in which the production of the gas well is stationary or has little fluctuation.
In the related art, the method for determining the stable production age of the gas well mainly comprises the following steps: in the early stage of gas well development, the stable production age of a gas well is predicted by an empirical method.
However, prediction errors are large in empirically predicting the stationary production age of a gas well.
Disclosure of Invention
The embodiment of the application provides a method, a device, a terminal and a storage medium for determining the stable production period of a gas well, which can reduce the prediction error of the stable production period. The method, the device, the terminal and the storage medium for determining the stable production age of the gas well have the following technical scheme:
In a first aspect, there is provided a method of determining the stationary production age of a gas well, the method comprising:
Acquiring historical production data of a gas well and accumulated gas yield of the gas well at the beginning of a stable production period;
determining a correspondence of bottom hole flow pressure and cumulative gas production of the gas well based on historical production data of the gas well;
Determining the bottom hole flow pressure of the gas well at the end of a stable production period based on the minimum wellhead output pressure of the gas well;
Determining the cumulative gas yield of the gas well at the end of the stable production period based on the bottom hole flow pressure at the end of the stable production period and the corresponding relation;
And determining the stable production age of the gas well based on the accumulated gas yield at the beginning of the stable production period, the accumulated gas yield at the end of the stable production period and the annual production of the gas well in the stable production period.
In one possible implementation, the historical production data includes a historical bottom hole flow pressure and a historical cumulative gas yield of the gas well, and the determining a correspondence of the bottom hole flow pressure and the cumulative gas yield of the gas well based on the historical production data of the gas well includes:
Performing curve fitting based on the historical bottom hole flow pressure and the historical cumulative gas yield in the historical production data of the gas well to obtain a fitting curve of the historical bottom hole flow pressure and the historical cumulative gas yield;
And taking the fitted curve as the corresponding relation between the bottom hole flow pressure and the cumulative gas production.
In one possible implementation manner, the process for acquiring the cumulative gas yield in the beginning of the stable production period includes:
And determining the cumulative gas yield of the gas well when the gas yield of the gas well reaches the set gas yield of the stable production period, and taking the cumulative gas yield of the gas well as the cumulative gas yield of the gas well at the beginning of the stable production period.
In one possible implementation, the determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum output pressure of the wellhead of the gas well includes:
acquiring physical parameters of the gas well and the minimum output pressure of the wellhead;
and determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure, the physical parameters and a vertical pipe flow calculation formula.
In one possible implementation, the determining the stable production age of the gas well based on the cumulative gas production at the beginning of the stable production period, the cumulative gas production at the end of the stable production period, and the annual production of the gas well during the stable production period includes:
Acquiring the annual output of the gas well in a stable production period;
Determining the stable production age of the gas well based on the annual production, the cumulative gas production at the beginning of the stable production period, the cumulative gas production at the end of the stable production period, and the following formula,
Wherein T a is the stable production period of the gas well, G e is the accumulated gas yield at the end of the stable production period, G b is the accumulated gas yield at the beginning of the stable production period,For the annual production.
In a second aspect, there is provided an apparatus for determining the stationary production age of a gas well, the apparatus comprising:
The acquisition module is used for acquiring historical production data of the gas well and accumulated gas yield of the gas well at the beginning of a stable production period;
The corresponding relation determining module is used for determining the corresponding relation between the bottom hole flow pressure and the accumulated gas yield of the gas well based on the historical production data of the gas well;
The bottom hole flow pressure determining module is used for determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure of the gas well;
The cumulative gas production determining module is used for determining the cumulative gas production of the gas well at the end of the stable production period based on the bottom hole flow pressure at the end of the stable production period and the corresponding relation;
and the stable production period determining module is used for determining the stable production period of the gas well based on the accumulated gas production amount at the beginning of the stable production period, the accumulated gas production amount at the end of the stable production period and the annual production amount of the gas well in the stable production period.
In one possible implementation, the historical production data includes a historical bottom hole pressure and a historical cumulative gas yield of the gas well, and the correspondence determination module is configured to:
Performing curve fitting based on the historical bottom hole flow pressure and the historical cumulative gas yield in the historical production data of the gas well to obtain a fitting curve of the historical bottom hole flow pressure and the historical cumulative gas yield;
And taking the fitted curve as the corresponding relation between the bottom hole flow pressure and the cumulative gas production.
In one possible implementation manner, the acquiring module is configured to:
And determining the cumulative gas yield of the gas well when the gas yield of the gas well reaches the set gas yield of the stable production period, and taking the cumulative gas yield of the gas well as the cumulative gas yield of the gas well at the beginning of the stable production period.
In one possible implementation, the bottom hole pressure determination module is configured to:
acquiring physical parameters of the gas well and the minimum output pressure of the wellhead;
and determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure, the physical parameters and a vertical pipe flow calculation formula.
In one possible implementation manner, the stable production age determining module is configured to:
Acquiring the annual output of the gas well in a stable production period;
Determining the stable production age of the gas well based on the annual production, the cumulative gas production at the beginning of the stable production period, the cumulative gas production at the end of the stable production period, and the following formula,
Wherein T a is the stable production period of the gas well, G e is the accumulated gas yield at the end of the stable production period, G b is the accumulated gas yield at the beginning of the stable production period,For the annual production.
In a third aspect, a terminal is provided, wherein the terminal comprises a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement a method for determining the stationary production age of a gas well as described above.
In a fourth aspect, a computer readable storage medium is provided, wherein at least one instruction is stored in the computer readable storage medium, the at least one instruction being loaded and executed by a processor to implement a method of determining a stationary production age of a gas well as described above.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
According to the embodiment of the application, the corresponding relation between the bottom hole flow pressure and the accumulated gas yield is determined according to the historical production data of the gas well, and then the accumulated gas yield of the gas well at the end of the stable production period can be determined according to the bottom hole flow pressure at the end of the stable production period and the corresponding relation, and then the accumulated gas yield of the gas well at the beginning of the stable production period is combined, so that the stable production period of the gas well can be determined.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of determining the stationary production age of a gas well provided by an embodiment of the present application;
FIG. 2 is a flow chart of a method of determining the stationary production age of a gas well provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of a steady-state simulated oil pressure decreasing curve of a gas well according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a quasi-steady-state flow provided by an embodiment of the present application;
FIG. 5 is a schematic illustration of a quasi-steady-state oil pressure gradient method according to an embodiment of the present application;
FIG. 6 is a schematic diagram of determining the cumulative gas production during a stationary production phase of a gas well according to an embodiment of the present application;
FIG. 7 is a schematic diagram showing changes in gas production rate and cumulative gas production according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a device for determining the stationary production age of a gas well according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
The method for determining the stable production age of the gas well, which is provided by the embodiment of the application, can be applied to the technical field of oil and gas field development, and is particularly used for determining the stable production age of the gas well. Firstly, a technician can extend logging equipment into the gas well, and logging data of the gas well are acquired. Then, a technician can input the logging data into a terminal for storage, the terminal can acquire the logging data, and the stable production age of the gas well is predicted by adopting the method for determining the stable production age of the gas well provided by the embodiment of the application.
FIG. 1 is a flow chart of a method for determining the stationary production age of a gas well provided by an embodiment of the present application. Referring to fig. 1, this embodiment includes:
In step 101, historical production data for a gas well and cumulative gas production for the gas well at the beginning of a stationary production period are obtained.
In step 102, a correspondence of bottom hole pressure and cumulative gas production of the gas well is determined based on historical production data of the gas well.
In step 103, a bottom hole flow pressure of the gas well at the end of the stationary production period is determined based on the minimum wellhead output pressure of the gas well.
In step 104, the cumulative gas production of the gas well at the end of the stationary phase is determined based on the bottom hole flow pressure at the end of the stationary phase and the correspondence.
In step 105, a stationary age of the gas well is determined based on the cumulative gas production at the beginning of the stationary phase, the cumulative gas production at the end of the stationary phase, and the annual production of the gas well during the stationary phase.
According to the embodiment of the application, the corresponding relation between the bottom hole flow pressure and the accumulated gas yield is determined according to the historical production data of the gas well, and then the accumulated gas yield of the gas well at the end of the stable production period can be determined according to the bottom hole flow pressure at the end of the stable production period and the corresponding relation, and then the accumulated gas yield of the gas well at the beginning of the stable production period is combined, so that the stable production period of the gas well can be determined.
FIG. 2 is a flow chart of a method for determining the stationary production age of a gas well provided by an embodiment of the present application. This embodiment may be performed by a terminal, see fig. 2, comprising:
in step 201, historical production data for a gas well is obtained.
Wherein the historical production data comprises historical bottom hole flow pressure and historical cumulative gas production of the gas well.
In one possible implementation, the process of obtaining historical production data for a gas well is: in the production process of a gas well, logging equipment is utilized to test the bottom hole flow pressure and the cumulative gas yield of the gas well for a plurality of times, namely, the historical bottom hole flow pressure and the historical cumulative gas yield of the gas well are measured, so that the historical production data of the gas well can be obtained.
In another possible implementation, the process of obtaining historical production data for a gas well is: in the production process of the gas well, logging equipment is utilized to test the bottom hole flow pressure and accumulated gas yield of the gas well for a plurality of times, and deviation factors corresponding to different bottom hole flow pressures are calculated, so that the historical bottom hole flow pressure, the historical accumulated gas yield and the deviation factors corresponding to the historical bottom hole flow pressure of the gas well can be obtained, and then the historical production data of the gas well can be obtained. In the process, the deviation factor corresponding to each bottom hole flow pressure is calculated, so that the bottom hole flow pressure can be determined more accurately, the subsequent corresponding relation determining process is facilitated, and the accuracy of determining the stable production age is improved.
It should be understood that, the process of logging by the technician is performed before implementing the present application, after logging is completed, the technician may store the obtained historical production data to the terminal, so that the terminal can obtain the historical production data, and further, the terminal obtains the historical production data stored by the local terminal in response to the instruction for determining the stable production period, so as to perform the subsequent process for determining the stable production period.
For example, the historical production data of a gas well of a certain constant volume gas reservoir will be shown below. The gas well starts to be produced from 1 month in 2006, in the production process of the gas well, logging equipment is utilized to test the bottom hole flow pressure and accumulated gas yield of the gas well for a plurality of times, deviation factors corresponding to different bottom hole flow pressures are calculated, and the bottom hole flow pressure, the accumulated gas yield and the deviation factors corresponding to different dates can be obtained, as shown in table 1. Optionally, to ensure accuracy of the prediction, data from 2008 onward may be selected as the historical production data.
TABLE 1
In step 202, the cumulative gas production of the gas well at the beginning of the stationary phase is obtained.
The initial period of stable production refers to the time of entering the stable production period. The stable production period refers to the period in which the gas production of the gas well is stable, and the gas production is understood to be the gas production rate, and the stable production period is the period in which the gas production rate is maintained at a certain rate value. It should be noted that, when a gas well is produced in a constant production depressurization manner, that is, a technician typically presets a gas production amount (gas production rate), and when the gas production amount of the gas well reaches the preset gas production amount, the gas well enters a stable production period. In the production process of the gas well, along with the continuous reduction of the pressure, when the wellhead pressure is reduced to the minimum output pressure of the wellhead, the production mode of the gas well is changed into constant pressure drop, and at the moment, the gas yield of the gas well starts to be reduced, namely the stable production period is ended.
In one possible implementation, the process of obtaining the cumulative gas yield of the gas well at the beginning of the stable production period is as follows: in the production process of the gas well, the gas production speed of the gas well is measured by using logging equipment, the cumulative gas production of the gas well is recorded in real time, the recorded cumulative gas production is stored into a terminal, and the cumulative gas production of the gas well can be obtained by the terminal. When the gas production speed of the gas well reaches the set gas production speed in the stable production period, determining the cumulative gas production of the gas well when the gas production speed of the gas well reaches the set gas production speed in the stable production period, and taking the cumulative gas production as the cumulative gas production of the gas well in the initial stage of the stable production period.
In the process, based on the production mode of constant production depressurization, the set gas production speed is skillfully utilized to judge whether the gas well reaches the set gas production speed, and then when the gas well reaches the set gas production speed, the corresponding cumulative gas production is obtained, the cumulative gas production at the beginning of the stable production period can be conveniently and rapidly determined, and the efficiency of determining the cumulative gas production at the beginning of the stable production period is improved.
In step 203, a correspondence of bottom hole pressure and cumulative gas production of the gas well is determined based on historical production data of the gas well.
The bottom hole flow pressure refers to the pressure measured at the bottom of a well during the production of the gas well. The cumulative gas production refers to the total amount of produced gas from the beginning of gas production to the current moment in time.
In one possible implementation, the process of determining, by the terminal, a correspondence of bottom hole pressure and cumulative gas production of the gas well includes: after the historical production data of the gas well is obtained, curve fitting is carried out based on the historical bottom hole flow pressure and the historical cumulative gas yield in the historical production data of the gas well, a fitting curve of the historical bottom hole flow pressure and the historical cumulative gas yield is obtained, and the fitting curve is used as the corresponding relation between the bottom hole flow pressure and the cumulative gas yield.
For example, from the historical production data in table 1, a curve fit may be performed to obtain a pseudo steady state oil pressure decreasing curve for the gas well, i.e., a correspondence of bottom hole flow pressure and cumulative gas production for the gas well. As shown in fig. 3, fig. 3 is a schematic diagram of a pseudo steady-state oil pressure decreasing curve of a gas well provided by the embodiment of the present application, wherein the abscissa in fig. 3 is a cumulative gas production Gp, the unit is 10 8m3, the ordinate is a bottom hole flow pressure P wf/Z, the unit is Mpa, and the corresponding relationship between the bottom hole flow pressure and the cumulative gas production can be in a functional form y= -9.7291x+41.758.
It should be noted that, in the embodiment of the present application, the correspondence between the bottom hole flow pressure and the cumulative gas production is used to refer to a pseudo steady state oil pressure decreasing curve. According to the quasi-steady-state oil pressure decreasing curve, the quasi-steady-state oil pressure decreasing method is utilized to carry out subsequent operation, and the steady production age of the gas well can be predicted. Quasi-steady-state oil pressure progressive subtraction is based on the principles of percolation mechanics, and for a reservoir with a limited outer boundary closed, when a gas well is produced for a period of time at a relatively steady gas production rate, pressure waves will propagate to the outer boundary of the formation and percolation of gas will enter a quasi-steady state. For example, fig. 4 is a schematic diagram of pseudo steady-state flow provided by an embodiment of the present application, as shown in fig. 4, the left side of fig. 4 is the near side of the gas well, the corresponding pressures are bottom hole pressures, such as P wf1 and P wf2, the right side is the far side of the gas well, and the corresponding pressures are formation pressures, such as P 1 and P 2. Fig. 4 includes pressure drop funnel curves corresponding to different times, such as those shown in fig. 4 when time t=t p, and it can be seen that the pressure drop funnel curves corresponding to different times are parallel to each other, i.e., the pressure drop velocity of the formation pressure is constant. Therefore, for the gas reservoir material balance formula (1) or the gas reservoir material balance formula (2), the formation pressure and cumulative gas yield curves and the bottom hole flow pressure and cumulative gas yield curves are made in the same coordinate system, as shown in fig. 5, fig. 5 is a schematic diagram of a quasi-steady state oil pressure progressive subtraction provided by the embodiment of the present application, the solid line P/Z in fig. 5 is the formation pressure and cumulative gas yield curve, the dashed line P wf/Z is the bottom hole flow pressure and cumulative gas yield curve, it can be found that the two curves are parallel to each other, and the solid line P c/Z in fig. 5 is the gas well oil pressure and cumulative gas yield curve, that is, after the gas well is produced at a relatively stable gas yield speed for a period, the gas well oil pressure and cumulative gas yield curves, and the bottom hole flow pressure and cumulative gas yield curves are parallel to each other.
Wherein P is the formation pressure, the unit is MPa, Z is a deviation factor, G p is the cumulative gas yield, the unit is m 3, G is the gas reservoir reserve, and the unit is m 3.
In the embodiment of the application, when the stable production period of the gas well of the constant volume gas reservoir is determined, the corresponding relation between the bottom hole flow pressure and the cumulative gas yield can be accurately acquired by utilizing the quasi-steady oil pressure decreasing curve of the gas well, and the corresponding relation between the bottom hole flow pressure and the cumulative gas yield has higher stability and accuracy, so that the subsequent operation is carried out, and the stable production period of the gas well can be accurately determined.
In step 204, physical parameters of the gas well are determined based on the average temperature of the well bore of the gas well and the depth of the well head to the middle of the formation.
In embodiments of the application, the physical parameters include gas well index and gas well friction coefficient.
In one possible implementation, the process of obtaining the gas well index is: and (3) measuring the shaft temperatures of a plurality of gas wells by using logging equipment, calculating the shaft average temperature of the gas wells, and determining the gas well index based on the shaft average temperature of the gas wells, the depth from the well head of the gas well to the middle part of the gas layer and the formula (3).
Where s is the well index, T is the average temperature of the well bore of the well, in K, Z is the average deviation coefficient of the well, H is the depth from the wellhead to the middle of the formation, in m, and r g is the natural gas relative density.
In one possible implementation, the process of obtaining the friction coefficient of the gas well is: and (3) determining the friction coefficient of the gas well according to the inner diameter of the oil pipe of the gas well, the Reynolds number and the formula (4).
Wherein f is the friction coefficient, e is a constant, d is the inner diameter of the oil pipe of the gas well, the unit is m, and R e is the Reynolds number.
In step 205, a bottom hole flow pressure of the gas well at the end of the stationary production period is determined based on the physical parameters of the gas well and the wellhead minimum output pressure.
The minimum wellhead output pressure can be measured by a technician by using logging equipment.
In one possible implementation, after the physical parameters and the minimum wellhead output pressure of the gas well are obtained, the physical parameters and the minimum wellhead output pressure of the gas well are stored to a terminal, and the terminal can obtain the physical parameters and the minimum wellhead output pressure of the gas well. The terminal can determine the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum output pressure of the wellhead, physical parameters and a vertical pipe flow calculation formula.
Optionally, the corresponding process of determining the bottom hole flow pressure of the gas well at the end of the production stabilizing period by the terminal comprises: the terminal can determine the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum output pressure of the wellhead, the physical parameters and the vertical pipe flow calculation formula (5).
Wherein p wf is the bottom hole flow pressure of the gas well at the end of the stable production period, the unit is MPa, p wh is the minimum well head output pressure, the unit is MPa, e is a constant, T is the average well shaft temperature of the gas well, the unit is K, Z is the average deviation coefficient of the gas well, q se is the flow rate of natural gas in a standard state, the unit is m 3/d, f is the friction coefficient, s is the gas well index, d is the inner diameter of an oil pipe of the gas well, and the unit is m.
For example, the minimum output pressure of the gas well may be 6.2Mpa, and for different gas production speeds, according to the above calculation formulas (3) to (5), the bottom hole flow pressures corresponding to the different gas production speeds, that is, the bottom hole flow pressures corresponding to the different gas production speeds at the end of the stable production period, may be calculated, and as shown in table 2, table 2 shows the bottom hole flow pressures corresponding to the gas production speeds of 30000, 40000, 50000 and 60000, respectively.
TABLE 2
| Gas production rate (10 4m3/d) | Bottom hole flow pressure P wf (MPa) | Deviation factor Z |
| 30000 | 15.063 | 0.872 |
| 40000 | 15.135 | 0.874 |
| 50000 | 15.226 | 0.876 |
| 60000 | 15.335 | 0.978 |
In step 206, the cumulative gas production of the gas well at the end of the stationary phase is determined based on the bottom hole flow pressure at the end of the stationary phase and the correspondence.
In one possible implementation manner, after the terminal obtains the bottom hole flow pressure of the gas well at the end of the stable production period, the cumulative gas yield at the end of the stable production period can be determined according to the corresponding relationship between the bottom hole flow pressure and the cumulative gas yield of the gas well. For example, fig. 6 is a schematic diagram for determining cumulative gas production in a stable production period of a gas well, as shown in fig. 6, where fig. 6 includes a pseudo-steady oil pressure decreasing curve of the gas well, that is, a corresponding relationship between bottom hole flow pressure and cumulative gas production, and in fig. 6, an abscissa is a cumulative gas production Gp of the gas well, and an ordinate is a bottom hole flow pressure P wf/Z,Pwf/Z dotted line of the gas well, which indicates a corresponding relationship between bottom hole flow pressure and cumulative gas production of the gas well, and an abscissa corresponding to bottom hole flow pressure of the gas well at the end of the stable production period, that is, a cumulative gas production Ge of the gas well at the end of the stable production period.
In step 207, a stationary age of the gas well is determined based on the cumulative gas production at the beginning of the stationary phase, the cumulative gas production at the end of the stationary phase, and the annual production of the gas well during the stationary phase.
In one possible implementation, first, the terminal may obtain the gas production rate of the gas well, and according to the gas production rate and time of the gas well, the annual production of the gas well in the stationary production period may be obtained. Based on the annual production, the cumulative gas production at the beginning of the stationary phase, the cumulative gas production at the end of the stationary phase, and equation (6), the stationary phase age of the gas well can be determined.
Wherein T a is the stable production period of the gas well, the unit is year, G e is the accumulated gas yield at the end of the stable production period, the unit is m 3,Gb is the accumulated gas yield at the beginning of the stable production period, the unit is m 3,The unit is m 3/year for annual yield.
For example, under the condition of different gas production speeds, according to the corresponding relation between the bottom hole flow pressure at the end of the steady production period in table 2 and the bottom hole flow pressure and the cumulative gas production of the gas well in fig. 3, the cumulative gas production of the gas well at the end of the steady production period can be obtained, as shown in table 3, and then according to the cumulative gas production of the gas well at the beginning of the steady production period, the cumulative gas production of the gas well at the end of the steady production period and the formula (6) in step 207, the steady production period of the gas well can be obtained, as shown in table 3.
TABLE 3 Table 3
The embodiment of the application also provides a comparison between the predicted stable yield period and the actual stable yield period of the scheme, and the following detailed description is made on the comparison between the predicted stable yield period and the actual stable yield period:
after the exploitation of the gas well is finished, curve fitting is performed according to actual production data of the gas well in 4 months of 2010 by using a numerical simulation method, so that a change chart of the gas production speed and cumulative gas production of the gas well can be obtained, as shown in fig. 7, a dotted line in fig. 7 refers to a gas production speed change chart corresponding to the gas production speeds of different stable production periods, including a gas production speed change chart when the gas production speeds of the stable production periods are 30000, 40000, 50000 and 60000, a gas production speed change chart when the gas production speed of the stable production period is 60000, a dotted line 1 in fig. 7 refers to a gas production speed change chart when the gas production speed of the stable production period is 50000, a gas production speed change chart when the gas production speed of the stable production period is 40000, a dotted line 3 refers to a gas production speed change chart when the gas production speed of the stable production period is 30000, and the gas well enters the stable production period when the gas production speed of the gas well reaches the set stable production speed of the stable production period. The solid line in fig. 7 refers to a variation graph of cumulative gas production corresponding to the gas production rate in different stable periods, including a variation graph of cumulative gas production corresponding to the gas production rate in the stable period of 30000, a variation graph of cumulative gas production corresponding to the gas production rate in the stable period of 40000, a variation graph of cumulative gas production corresponding to the gas production rate in the stable period of 50000, a variation graph of cumulative gas production corresponding to the gas production rate in the stable period of 60000, a variation graph of cumulative gas production corresponding to the gas production rate in the stable period of 50000, a variation graph of cumulative gas production corresponding to the gas production rate in the stable period of 30000, and a solid line 4. In fig. 7, the abscissa indicates the date, the left ordinate indicates the cumulative gas yield of the gas well, the right ordinate indicates the gas yield rate of the gas well, when the gas yield rate is constant, the gas well enters a stable production period, the stable production years corresponding to different gas yield rates can be obtained according to the abscissa corresponding to the stable production period, and when the stable production period is finished, the cumulative gas yield of the gas well is the cumulative gas yield of the gas well at the end of the stable production period.
From the gas well gas production rate profile and cumulative gas production profile of fig. 7, the stationary age and stationary end-of-production rate of the gas well at different stationary production rates can be determined, as shown in table 4.
TABLE 4 Table 4
According to steps 201 to 207, the predicted stable production age of the gas well can be obtained, as shown in table 3, the actual stable production age of the gas well can be obtained according to a numerical simulation method, as shown in table 4, and the stable production age comparison table of the gas well can be obtained by comparing and analyzing tables 3 and 4, as shown in table 5.
TABLE 5
Table 5 shows the predicted stable production period and the actual stable production period corresponding to different gas production rates, and the error of the predicted stable production period in the scheme is calculated according to the actual stable production period, and when the gas production rates are 30000, 40000, 50000 and 60000, the error of the predicted stable production period in the scheme is within 5% compared with the actual stable production period, and the error is smaller.
According to the method provided by the embodiment of the application, the accumulated gas yield of the gas well at the end of the stable production period can be obtained, and can be called as the predicted accumulated gas yield at the end of the stable production period, as shown in table 3, the actual accumulated gas yield at the end of the stable production period of the gas well can be obtained according to a numerical simulation method, as shown in table 4, and the accumulated gas yield at the end of the stable production period of the gas well can be obtained by comparing and analyzing the table 3 and the table 4, as shown in table 6. The error of the predicted total gas production rate at the end of the stable period of the present scheme is calculated according to the actual total gas production rate at the end of the stable period, which are given in table 6, and the calculated error is within 5% when the gas production rates are 30000, 40000, 50000 and 60000, as can be seen from table 6.
TABLE 6
According to the embodiment of the application, the corresponding relation between the bottom hole flow pressure and the accumulated gas yield is determined according to the historical production data of the gas well, and then the accumulated gas yield of the gas well at the end of the stable production period can be determined according to the bottom hole flow pressure at the end of the stable production period and the corresponding relation, and then the accumulated gas yield of the gas well at the beginning of the stable production period is combined, so that the stable production period of the gas well can be determined. The method provided by the embodiment of the application can accurately predict the stable production age of the gas well at the gas production speeds of different stable production periods, is simple and convenient, does not need a large amount of gas well data, and has high efficiency of determining the stable production age of the gas well.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein.
Based on the same technical concept, the embodiment of the application also provides a device for determining the stable production age of a gas well, which can be a terminal in the embodiment, as shown in fig. 8, and the device comprises:
An acquisition module 801, configured to acquire historical production data of a gas well and accumulated gas production of the gas well at an early stage of stable production;
a correspondence determination module 802, configured to determine a correspondence between a bottom hole flow pressure and a cumulative gas production of the gas well based on historical production data of the gas well;
The bottom hole flow pressure determining module 803 is used for determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure of the gas well;
The cumulative gas yield determining module 804 is configured to determine a cumulative gas yield of the gas well at the end of the stable production period based on the bottom hole flow pressure at the end of the stable production period and the correspondence;
The stationary production age determination module 805 is configured to determine a stationary production age of the gas well based on the cumulative gas production at the beginning of the stationary production period, the cumulative gas production at the end of the stationary production period, and the annual production of the gas well at the stationary production period.
In one possible implementation, the historical production data includes a historical bottom hole pressure and a historical cumulative gas production for the gas well, and the correspondence determination module 802 is configured to:
performing curve fitting based on the historical bottom hole flow pressure and the historical cumulative gas yield in the historical production data of the gas well to obtain a fitting curve of the historical bottom hole flow pressure and the historical cumulative gas yield;
and taking the fitting curve as the corresponding relation between the bottom hole flow pressure and the accumulated gas yield.
In one possible implementation, the obtaining module 801 is configured to:
And determining the cumulative gas yield of the gas well when the gas yield speed of the gas well reaches the set gas yield speed in the stable production period, and taking the cumulative gas yield as the cumulative gas yield of the gas well in the initial stage of the stable production period.
In one possible implementation, the bottom hole pressure determination module 803 is configured to:
Acquiring physical parameters of a gas well and minimum wellhead output pressure;
And determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum output pressure of the wellhead, the physical parameters and the vertical pipe flow calculation formula.
In one possible implementation, the stable production age determination module 805 is configured to:
Acquiring annual output of a gas well in a stable production period;
determining the stable production age of the gas well based on annual yield, cumulative gas yield at the beginning of the stable production period, cumulative gas yield at the end of the stable production period and the following formula,
Wherein T a is the stable production period of the gas well, G e is the accumulated gas yield at the end of the stable production period, G b is the accumulated gas yield at the beginning of the stable production period,Is annual yield.
According to the embodiment of the application, the corresponding relation between the bottom hole flow pressure and the accumulated gas yield is determined according to the historical production data of the gas well, and then the accumulated gas yield of the gas well at the end of the stable production period can be determined according to the bottom hole flow pressure at the end of the stable production period and the corresponding relation, and then the accumulated gas yield of the gas well at the beginning of the stable production period is combined, so that the stable production period of the gas well can be determined. The method provided by the embodiment of the application can accurately predict the stable production age of the gas well at the gas production speeds of different stable production periods, is simple and convenient, does not need a large amount of gas well data, and has high efficiency of determining the stable production age of the gas well.
It should be noted that: the device for determining the stable production age of the gas well provided in the above embodiment is only exemplified by the division of the above functional modules when determining the stable production age of the gas well, and in practical application, the above functional allocation may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device for determining the stable production age of the gas well provided by the embodiment and the method embodiment for determining the stable production age of the gas well belong to the same conception, and detailed implementation processes of the device are detailed in the method embodiment and are not repeated here.
In an exemplary embodiment, a terminal is provided that includes a processor and a memory having at least one instruction stored therein, the at least one instruction being loaded and executed by the processor to implement the method of determining a stationary production age of a gas well described above.
In an exemplary embodiment, a computer readable storage medium, such as a memory including instructions executable by a processor in a terminal to perform the method of determining the stationary production age of a gas well of the above embodiments is also provided. For example, the computer readable storage medium may be read-only memory (ROM), random-access memory (random access memory), RAM), compact-disk-read-only memory (CD-ROM), magnetic tape, floppy disk, optical data storage device, and the like.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but rather, the application is to be construed as limited to the appended claims.
Claims (7)
1. A method of determining the stationary phase of a gas well, the method comprising:
Acquiring historical production data of a gas well and accumulated gas yield of the gas well at the beginning of a stable production period;
determining a correspondence of bottom hole flow pressure and cumulative gas production of the gas well based on historical production data of the gas well;
Determining the bottom hole flow pressure of the gas well at the end of a stable production period based on the minimum wellhead output pressure of the gas well;
Determining the cumulative gas yield of the gas well at the end of the stable production period based on the bottom hole flow pressure at the end of the stable production period and the corresponding relation;
Determining a stationary production age of the gas well based on the cumulative gas production at the beginning of the stationary production period, the cumulative gas production at the end of the stationary production period, and the annual gas well production at the stationary production period;
The historical production data comprises historical bottom hole flow pressure and historical cumulative gas production of the gas well, and the determining the corresponding relation between the bottom hole flow pressure and the cumulative gas production of the gas well based on the historical production data of the gas well comprises the following steps:
Performing curve fitting based on the historical bottom hole flow pressure and the historical cumulative gas yield in the historical production data of the gas well to obtain a fitting curve of the historical bottom hole flow pressure and the historical cumulative gas yield;
taking the fitted curve as the corresponding relation between the bottom hole flow pressure and the accumulated gas yield;
the determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure of the gas well comprises the following steps:
acquiring physical parameters of the gas well and the minimum output pressure of the wellhead;
and determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure, the physical parameters and a vertical pipe flow calculation formula.
2. The method of claim 1, wherein the step of obtaining the cumulative gas production at the beginning of the stationary phase comprises:
And determining the cumulative gas yield of the gas well when the gas yield of the gas well reaches the set gas yield of the stable production period, and taking the cumulative gas yield of the gas well as the cumulative gas yield of the gas well at the beginning of the stable production period.
3. The method of claim 1, wherein the determining the stable age of the gas well based on the cumulative gas production at the beginning of the stable period, the cumulative gas production at the end of the stable period, and the annual production of the gas well during the stable period comprises:
Acquiring the annual output of the gas well in a stable production period;
Determining the stable production age of the gas well based on the annual production, the cumulative gas production at the beginning of the stable production period, the cumulative gas production at the end of the stable production period, and the following formula,
Wherein T a is the stable production period of the gas well, G e is the accumulated gas yield at the end of the stable production period, G b is the accumulated gas yield at the beginning of the stable production period,For the annual production.
4. An apparatus for determining the stationary phase of a gas well, the apparatus comprising:
The acquisition module is used for acquiring historical production data of the gas well and accumulated gas yield of the gas well at the beginning of a stable production period;
The corresponding relation determining module is used for determining the corresponding relation between the bottom hole flow pressure and the accumulated gas yield of the gas well based on the historical production data of the gas well;
The bottom hole flow pressure determining module is used for determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure of the gas well;
The cumulative gas production determining module is used for determining the cumulative gas production of the gas well at the end of the stable production period based on the bottom hole flow pressure at the end of the stable production period and the corresponding relation;
the stable production period determining module is used for determining the stable production period of the gas well based on the accumulated gas production amount at the beginning of the stable production period, the accumulated gas production amount at the end of the stable production period and the annual production amount of the gas well in the stable production period;
The historical production data comprises the historical bottom hole flow pressure and the historical cumulative gas production of the gas well, and the corresponding relation determining module is used for:
Performing curve fitting based on the historical bottom hole flow pressure and the historical cumulative gas yield in the historical production data of the gas well to obtain a fitting curve of the historical bottom hole flow pressure and the historical cumulative gas yield;
taking the fitted curve as the corresponding relation between the bottom hole flow pressure and the accumulated gas yield;
the bottom hole flow pressure determining module is also used for acquiring physical parameters of the gas well and the minimum wellhead output pressure;
and determining the bottom hole flow pressure of the gas well at the end of the stable production period based on the minimum wellhead output pressure, the physical parameters and a vertical pipe flow calculation formula.
5. The apparatus of claim 4, wherein the means for obtaining is configured to:
And determining the cumulative gas yield of the gas well when the gas yield of the gas well reaches the set gas yield of the stable production period, and taking the cumulative gas yield of the gas well as the cumulative gas yield of the gas well at the beginning of the stable production period.
6. A terminal comprising a processor and a memory having stored therein at least one instruction that is loaded and executed by the processor to implement the method of determining the stationary production age of a gas well of any one of claims 1 to 3.
7. A computer readable storage medium having stored therein at least one instruction that is loaded and executed by a processor to implement the method of determining the stationary production age of a gas well of any one of claims 1 to 3.
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