Gas well medicament discharge aiding well selection method and system

Abstract

The invention discloses a gas well medicament discharge aiding well selection method and system. The method comprises the following steps: acquiring key data of a gas well; calculating a surplus score of the gas well according to the gas well key data; and according to the surplus score of the gas well, determining a medicament discharge aiding process suitable for the gas well. By means of the scheme, the effective rate of the gas well medicament discharge aiding process can be improved.

Description

Technical Field

[0001] The invention relates to the field of gas field production increase, and in particular to a gas well chemical-assisted drainage and well selection method and system. Background Art

[0002] For old gas wells that have been developed for some time, in addition to conventional drainage and gas production processes, there is also a means of increasing production by injecting chemicals into the reservoir to solve reservoir problems. The old well chemical-assisted drainage process is a process that injects injection and drainage agents into the reservoir, and pushes the chemicals to the predetermined position by injecting nitrogen. By providing a lower surface tension, the reservoir is treated to a certain extent, thereby increasing the reservoir production and achieving the effect of increasing production. However, the success rate of implementing chemical-assisted drainage technology in old wells is currently low. How to select shale gas wells with development potential in a targeted manner is crucial to improving the efficiency of chemical-assisted drainage technology in old wells. Summary of the invention

[0003] The present invention provides a gas well chemical-assisted drainage well selection method and system to improve the efficiency of the gas well chemical-assisted drainage process.

[0004] To this end, the present invention provides the following technical solutions:

[0005] A gas well chemical-assisted drainage and well selection method, the method comprising:

[0006] Obtain key data of gas wells;

[0007] Calculating a surplus score of the gas well according to the key data of the gas well;

[0008] A suitable chemical-assisted drainage process for the gas well is determined according to the surplus score of the gas well.

[0009] Optionally, the key data of the gas well include any one or more of the following: the production days D from the start of the artificial intervention period R ,Yield pressure Cumulative production days D t , the casing pressure of the well has recovered to the highest value in the past 30 days Highest yield during rapid drainage period Maximum pressure during rapid drainage Current production Well type J, recovery degree R.

[0010] Optionally, calculating the surplus score of the gas well according to the key data of the gas well includes:

[0011] Evaluate different characteristics of the gas well according to the key data of the gas well to obtain evaluation scores corresponding to each characteristic;

[0012] The surplus score of the gas well is calculated according to the evaluation score corresponding to each feature.

[0013] Optionally, the evaluating different characteristics of the gas well according to the key data of the gas well to obtain the evaluation score corresponding to each characteristic includes any one or more of the following:

[0014] Calculate the proportional relationship S1 between the current production days of the gas well and the starting point of the artificial intervention period;

[0015] Calculating the proportional relationship S2 between the current production output of the gas well and the starting point of the artificial intervention period;

[0016] Calculating the ratio of the shut-in pressure of the gas well to the average pressure during the artificial intervention period S3;

[0017] Calculate the remaining gas S4 in the reservoir of the gas well;

[0018] Calculate the benchmark score S of the gas well b .

[0019] Optionally, calculating the surplus score of the gas well according to the evaluation score corresponding to each feature includes:

[0020] The surplus score S of the gas well is calculated according to the following formula:

[0021] S=(S1+S2+S3+S4)-S b .

[0022] Optionally, determining a suitable reagent-assisted drainage process for the gas well according to the surplus score of the gas well includes:

[0023] If the surplus score of the gas well is a positive number, it is determined that the appropriate chemical-assisted drainage process for the gas well is the old well chemical-assisted drainage process;

[0024] Otherwise, the appropriate chemical-assisted drainage process for the gas well is determined through manual judgment.

[0025] Optionally, the method further comprises:

[0026] Determine the production stage of the gas well, wherein the production stage of the gas well includes three production stages: rapid liquid drainage stage, spontaneous flow production stage and artificial intervention stage;

[0027] If the production stage of the gas well is the stage before the artificial intervention period, it is determined that the appropriate chemical-assisted drainage process for the gas well is the old well chemical-assisted drainage process.

[0028] Optionally, determining the production stage of the gas well includes:

[0029] Determining the production stage of the gas well according to the bottom hole pressure coefficient and the flowback rate of the gas well; or

[0030] The production stage of the gas well is determined according to the inflection points of the flowback fluid curve and the cumulative gas production curve of the gas well.

[0031] Optionally, the characteristic parameter range of the rapid drainage period is before the inflection point of the backflow rate curve; the characteristic parameter range of the self-flowing production period is the front end of both the cumulative output inflection point and the set time before the start of production time; the starting point of the manual intervention period is the self-flowing production period.

[0032] A gas well chemical-assisted drainage and well selection system, the system comprising:

[0033] A data acquisition module, used to obtain key data of gas wells;

[0034] A calculation module, used for calculating the surplus score of the gas well according to the key data of the gas well;

[0035] The judgment module is used to determine a suitable reagent-assisted drainage process for the gas well according to the surplus score of the gas well.

[0036] Optionally, the system also includes: a prediction module, used to determine the production stage of the gas well, the production stage of the gas well includes three production stages: rapid drainage period, self-flowing production period and artificial intervention period, and when the production stage of the gas well is the stage before the artificial intervention period, it is determined that the suitable chemical-assisted drainage process for the gas well is the old well chemical-assisted drainage process.

[0037] The gas well chemical-assisted drainage well selection method and system provided by the present invention obtains key data of the gas well, calculates the surplus score of the gas well according to the key data of the gas well, and determines the appropriate chemical-assisted drainage process for the gas well according to the surplus score of the gas well. The scheme of the present invention can improve the efficiency of the chemical-assisted drainage process of the gas well.

[0038] Furthermore, the entire production cycle of shale gas wells is divided into different production stages. For gas wells in the pre-artificial intervention stage, the old well chemical-assisted drainage process can be directly used, thereby reducing unnecessary calculations and improving efficiency.

[0039] The solution of the present invention can be used to quickly determine whether a gas well is suitable for the chemical-assisted drainage process. It is a new method for determining the production potential of a gas well and also provides certain treatment ideas for subsequent gas wells of other types. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of the gas well chemical-assisted drainage and well selection method provided by the present invention;

[0041] Figure 2 This is another flow chart of the gas well chemical-assisted drainage and well selection method provided by the present invention;

[0042] Figure 3 This is a schematic diagram of the flowback rate and cumulative gas production curve of a gas well;

[0043] Figure 4 This is a structural schematic diagram of a gas well chemical-assisted drainage and well selection system provided by the present invention;

[0044] Figure 5 This is another structural schematic diagram of the gas well chemical-assisted drainage and well selection system provided by the present invention;

[0045] Figure 6 It is the flowback rate and cumulative gas production curve of the 2HX-3 well in the example of the present invention. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0048] In view of the low success rate of implementing chemical-assisted drainage technology in existing old wells, there is a need to select shale gas wells with development potential to implement the chemical-assisted drainage technology in a targeted manner. The present invention provides a gas well chemical-assisted drainage well selection method and system, which obtains key data of the gas well, calculates the surplus score of the gas well according to the key data of the gas well, and determines the appropriate chemical-assisted drainage technology for the gas well according to the surplus score of the gas well.

[0049] like Figure 1 As shown, it is a flow chart of the gas well chemical-assisted drainage and well selection method provided by the present invention, which includes the following steps:

[0050] Step 101, obtaining key data of the gas well.

[0051] The key data of the gas well include but are not limited to any one or more of the following: the production days from the start of the artificial intervention period D R ,Yield (For example, it can be the average output 7 days after the start of the artificial intervention period), pressure (For example, it can be the average pressure of the 7 days after the start of the artificial intervention period). Cumulative production days D t , the casing pressure of the well has recovered to the highest value in the past 30 days Highest yield during rapid drainage period (For example, it can be the average output 7 days after the start of the artificial intervention period), the maximum pressure during the rapid drainage period (For example, it can be the average pressure 7 days after the start of the spraying period), current production Well type J (for example, 0.44 for an up-dip well, 0.56 for a down-dip well, and 1 for a vertical well), and recovery degree R.

[0052] Step 102: Calculate the surplus score of the gas well according to the key data of the gas well.

[0053] Specifically, different characteristics of the gas well may be evaluated according to the key data of the gas well to obtain an evaluation score corresponding to each characteristic; and then the surplus score of the gas well may be calculated according to the evaluation score corresponding to each characteristic.

[0054] Wherein, the gas well is evaluated for different characteristics according to the key data of the gas well, and the evaluation scores corresponding to each characteristic obtained may include but are not limited to any one or more of the following:

[0055] (1) Calculate the proportional relationship S1 between the current production days of the gas well and the starting point of the artificial intervention period, that is, The closer to the start of the artificial intervention period, the higher the S1 score. This is because the closer to the start of the artificial intervention period, the better the gas well is in a high-yield stage, the greater the gas layer energy is, and the greater the possibility of successful implementation of the drug-assisted drainage measures.

[0056] (2) Calculate the ratio S2 between the current production output of the gas well and the output at the start of the artificial intervention period, that is, The closer the two production rates are, the better the gas well is at a high-production stage, the greater the gas layer energy is, and the greater the possibility of success in implementing chemical-assisted drainage measures.

[0057] (3) Calculate the ratio S3 of the shut-in pressure of the gas well to the average pressure during the artificial intervention period, that is, The larger the S3 value is, the more it indicates that there is still high gas layer energy in the reservoir, which is helpful to the production increase effect after the agent is assisted in drainage.

[0058] (4) The remaining gas S4 in the gas well can be calculated using the following formula: S4 = 10(1-R) ​​× J; the greater the degree of recovery, the smaller the value of this item.

[0059] (5) Calculate the benchmark score S of the gas well b .

[0060] Benchmark Score b The calculation of is as follows:

[0061] S b =S1'+S2'+S3'+S4';

[0062] The calculation formulas of S1', S2', S3', and S4' are the same as those of S1, S2, S3, and S4. For example, according to experience, 1-R = 0.5;

[0063]

[0064] The benchmark scores for different types of wells can be calculated: 5.5 for up-dip wells, 7.2 for down-dip wells, and 12.5 for vertical wells.

[0065] Accordingly, the surplus score S of the gas well can be calculated according to the following formula:

[0066] S=(S1+S2+S3+S4)-S b .

[0067] It should be noted that the above method for calculating the surplus score of the gas well is only an exemplary description. In practical applications, other methods may be used according to application requirements, and this embodiment of the present invention does not limit this.

[0068] Step 103: determining a suitable chemical-assisted drainage process for the gas well according to the surplus score of the gas well.

[0069] The surplus score of the gas well calculated in step 102 above represents the production increase potential of the gas well by implementing the old well chemical-assisted drainage process. The higher the score, the greater the potential.

[0070] Therefore, the suitable chemical-assisted drainage process for the gas well can be determined in the following manner: if the surplus score of the gas well is a positive number, the suitable chemical-assisted drainage process for the gas well is determined to be the old well chemical-assisted drainage process; otherwise, the suitable chemical-assisted drainage process for the gas well can be determined by manual judgment.

[0071] The gas well chemical-assisted drainage well selection method of the embodiment of the present invention calculates the surplus score of the gas well using the key data of the gas well, and determines the appropriate chemical-assisted drainage process for the gas well according to the calculated surplus score of the gas well. By using the scheme of the present invention, it is possible to quickly determine whether a gas well is suitable for the chemical-assisted drainage process, thereby improving the gas well operation efficiency.

[0072] Furthermore, considering that gas wells at different production stages have different characteristics, it is possible to directly determine whether some gas wells can use the old well chemical-assisted drainage process based on the production stage of the gas well. Figure 2 Provide detailed explanation.

[0073] like Figure 2 FIG. 1 is another flow chart of the gas well chemical-assisted well selection method provided by the present invention, which includes the following steps:

[0074] Step 201, selecting a gas well to be determined.

[0075] Step 202, determining the production stage of the gas well. If the production stage of the gas well is a stage before the artificial intervention period, executing step 203; otherwise, executing step 204.

[0076] In a non-limiting embodiment, the bottom hole pressure coefficient B wf and the return rate R R As characteristic parameters, the whole production cycle of shale gas wells is divided into three production stages: rapid drainage stage, spontaneous flow production stage and artificial intervention stage. Among them:

[0077] The characteristic parameter range of the rapid drainage period is before the inflection point of the backflow rate curve;

[0078] The characteristic parameter range of the automatic spraying production period is the front end of the cumulative output inflection point and the set time (such as 24 hours) before the start of production time;

[0079] The starting point of the artificial intervention period is the self-spraying production period.

[0080] like Figure 3 As shown, it is the flowback rate and cumulative gas production curve of a gas well, curve 31 is the flowback liquid curve, and curve 32 is the cumulative gas production curve.

[0081] According to the bottom hole pressure coefficient and the return flow rate numerical determination method, for example, it can be set that the characteristic parameter range of the rapid drainage period is 1≤B wf And R R <0.3, the characteristic parameter range of the self-spraying production period is 0.5≤B wf <1 and 0.3≤R R <1, the characteristic parameter range of the artificial production period is B wf <0.5 and R R >1.

[0082] Considering that a single numerical definition method cannot encompass and accurately describe the production status of all gas wells, in another non-limiting embodiment, the curve inflection point method can be used to determine the rapid drainage period, and the relatively early determination method of the cumulative production inflection point and the continuous production inflection point time can be used to determine the self-flowing production period.

[0083] Combination Figure 3 As shown, the inflection point A of the curve 31 is used as the dividing base point to determine the rapid drainage period of the gas well, and the inflection point B of the curve 32 and the inflection point A of the curve 31, whichever is earlier, is used as the dividing base point to determine the self-flowing production period of the gas well. That is:

[0084] Before the inflection point A is the rapid drainage period, during which the self-spraying output is high and the water-carrying capacity is extremely strong. The production capacity is slightly affected by the accumulated liquid. During this period, no human intervention in the construction of chemical-assisted drainage is involved.

[0085] The period between inflection point A and inflection point B is the self-flowing production period. During this period, the self-flowing production can fully meet the gas well's liquid carrying requirements. In the early stage, there will be no problems such as reservoir liquid accumulation. However, as the reservoir pressure decreases, the gas volume of the gas well also decreases, and the gas well's water carrying capacity decreases. Often, liquid accumulation often occurs in the gas well in the late stage, which will cause a series of other problems. Therefore, generally at the end of this stage, artificial pharmaceutical drainage measures are often required to intervene in production.

[0086] Accordingly, when determining the production stage of a gas well, the bottom hole pressure coefficient and the flowback rate can be used as characteristic parameters to determine the production stage of the gas well. Specifically, the production stage can be determined based on the range of the above characteristic parameters or the inflection point of the corresponding flowback liquid curve and the cumulative gas production curve, which is not limited in the embodiment of the present invention.

[0087] For gas wells that are still in the period before artificial intervention, the old well chemical-assisted drainage process can be directly adopted. For gas wells in the artificial intervention period, it is necessary to calculate the surplus score of the gas well to determine whether to recommend the old well chemical-assisted drainage process, that is, to execute the subsequent steps.

[0088] Continue to refer to Figure 2 In step 203, it is determined that the appropriate chemical-assisted drainage process for the gas well is the chemical-assisted drainage process for the old well. Otherwise, step 204 is executed.

[0089] Step 204, obtaining key data of the gas well.

[0090] Step 205: Calculate the surplus score of the gas well according to the key data of the gas well.

[0091] Step 206, determining a suitable chemical-assisted drainage process for the gas well according to the surplus score of the gas well.

[0092] The above steps 203 to 205 are Figure 1 Steps 101 to 103 are the same and will not be described again.

[0093] The gas well chemical-assisted drainage and well selection method provided in the embodiment of the present invention divides the entire production cycle of a shale gas well into different production stages. For gas wells in the pre-artificial intervention stage, the old well chemical-assisted drainage process can be directly used, thereby reducing unnecessary calculations and improving efficiency.

[0094] The following takes the Sichuan Weiyuan 2HX-3 well as an example to further illustrate the process of using the method of the present invention to determine whether the gas well can use the old well chemical-assisted drainage process.

[0095] like Figure 6 The figure shows the flowback rate and cumulative gas production curve of Well 2HX-3.

[0096] according to Figure 6 The flowback rate and cumulative gas production curve of Well 2HX-3 shown in the figure show that the rapid drainage period is 127 days after production, the self-flowing production period is 333 days after production, and then the artificial intervention period. Well 2HX-3 is in the artificial intervention period. Therefore, it is necessary to calculate the surplus score of Well 2HX-3 to determine whether the well can use the old well chemical-assisted drainage process.

[0097] First, the key data of Well 2HX-3 are as follows:

[0098] The number of production days from the start of the artificial intervention period D R is 333 days;

[0099] Yield at the start of the intervention period 57,300 cubic meters per day;

[0100] Pressure at the start of the intervention period 5.28MPa;

[0101] Cumulative production days D t 1593 days;

[0102] The casing pressure of the shut-in well has recovered to the highest value in the past 30 days 2.15MPa;

[0103] Highest yield during rapid drainage period 151,800 cubic meters per day;

[0104] Maximum pressure during rapid drainage 12.86MPa;

[0105] Current production 3,500 cubic meters per day;

[0106] The well type is a down-dip well, and the corresponding parameter J is 0.56;

[0107] The recovery degree R = 0.35.

[0108] Based on the above key data, the gas well surplus score is calculated:

[0109]

[0110] The calculated gas well surplus score is greater than 0, and the old well chemical-assisted drainage process is recommended for this well.

[0111] By implementing the chemical-assisted drainage technology on the well, the average daily production increased by 7,400 cubic meters / day. The measure was effective for 52 days, and the cumulative gas production increased by 203,400 cubic meters.

[0112] Accordingly, the present invention also provides a gas well chemical-assisted drainage and well selection system, such as Figure 4 The figure shows a structural diagram of the system.

[0113] The gas well chemical-assisted drainage and well selection system 400 includes the following modules:

[0114] Data acquisition module 401, used to acquire key data of gas wells;

[0115] A calculation module 402, configured to calculate a surplus score of the gas well according to the key data of the gas well;

[0116] The judgment module 403 is used to determine a suitable chemical-assisted drainage process for the gas well according to the surplus score of the gas well.

[0117] like Figure 5 FIG. 1 is another schematic diagram of the structure of the gas well chemical-assisted drainage and well selection system of the present invention.

[0118] and Figure 4 The difference from the embodiment shown is that the gas well chemical-assisted drainage and well selection system 400 of this embodiment further includes:

[0119] The prediction module 501 is used to determine the production stage of the gas well, which includes three production stages: rapid drainage stage, self-flowing production stage and artificial intervention stage. When the production stage of the gas well is before the artificial intervention stage, the suitable chemical-assisted drainage process for the gas well is determined to be the old well chemical-assisted drainage process. If the production stage of the gas well is the artificial intervention stage, the data acquisition module 401 is triggered to acquire the key data of the gas well, and then the corresponding calculation is performed according to the key data to determine the suitable chemical-assisted drainage process for the gas well.

[0120] For other descriptions of the modules and units in the gas well chemical-assisted drainage and well selection system of the present invention, reference can be made to the corresponding descriptions in the above-mentioned method embodiments of the present invention, which will not be repeated here.

[0121] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0122] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. Moreover, the system embodiments described above are merely schematic, in which the modules and units described as separate components may or may not be physically separated, that is, they may be located on one network unit, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0123] The embodiments of the present invention are described in detail above. The present invention is described in detail using specific implementation methods herein. The description of the above embodiments is only used to help understand the method and system of the present invention. It is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should belong to the scope of protection of the present invention, and the content of this specification should not be understood as limiting the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas well chemical-assisted drainage and well selection method, characterized in that: The method comprises: Obtain key data of gas wells; Calculating a surplus score of the gas well according to the key data of the gas well; A suitable chemical-assisted drainage process for the gas well is determined according to the surplus score of the gas well.

2. The gas well chemical-assisted drainage and well selection method according to claim 1, characterized in that: The key data of the gas well include any one or more of the following: the production days from the start of the artificial intervention period D R ,Yield pressure Cumulative production days D t , the casing pressure of the well has recovered to the highest value in the past 30 days Highest yield during rapid drainage period Maximum pressure during rapid drainage Current production Well type J, recovery degree R.

3. The gas well chemical-assisted drainage and well selection method according to claim 2, characterized in that: Calculating the surplus score of the gas well according to the key data of the gas well includes: Evaluate different characteristics of the gas well according to the key data of the gas well to obtain evaluation scores corresponding to each characteristic; The surplus score of the gas well is calculated according to the evaluation score corresponding to each feature.

4. The gas well chemical-assisted drainage and well selection method according to claim 3, characterized in that: The evaluating of different characteristics of the gas well according to the key data of the gas well to obtain the evaluation score corresponding to each characteristic includes any one or more of the following: Calculate the proportional relationship S1 between the current production days of the gas well and the starting point of the artificial intervention period; Calculating the proportional relationship S2 between the current production output of the gas well and the starting point of the artificial intervention period; Calculating the ratio of the shut-in pressure of the gas well to the average pressure during the artificial intervention period S3; Calculate the remaining gas S4 in the gas well; Calculate the benchmark score S of the gas well b .

5. The gas well chemical-assisted drainage and well selection method according to claim 4, characterized in that: Calculating the surplus score of the gas well according to the evaluation score corresponding to each feature includes: The surplus score S of the gas well is calculated according to the following formula: S=(S1+S2+S3+S4)-S b 。 6. The gas well chemical-assisted drainage and well selection method according to claim 5, characterized in that: The step of determining a suitable reagent-assisted drainage process for the gas well according to the surplus score of the gas well includes: If the surplus score of the gas well is a positive number, it is determined that the appropriate chemical-assisted drainage process for the gas well is the old well chemical-assisted drainage process; Otherwise, the appropriate chemical-assisted drainage process for the gas well is determined through manual judgment.

7. The gas well chemical-assisted drainage and well selection method according to any one of claims 1 to 6, characterized in that: The method further comprises: Determine the production stage of the gas well, wherein the production stage of the gas well includes three production stages: rapid liquid drainage stage, spontaneous flow production stage and artificial intervention stage; If the production stage of the gas well is the stage before the artificial intervention period, it is determined that the appropriate chemical-assisted drainage process for the gas well is the old well chemical-assisted drainage process.

8. The gas well chemical-assisted drainage and well selection method according to claim 7, characterized in that: Determining the production stage of the gas well includes: Determining the production stage of the gas well according to the bottom hole pressure coefficient and the flowback rate of the gas well; or The production stage of the gas well is determined according to the inflection points of the flowback fluid curve and the cumulative gas production curve of the gas well.

9. The gas well chemical-assisted drainage and well selection method according to claim 8, characterized in that: The characteristic parameter range of the rapid drainage period is before the inflection point of the backflow rate curve; The characteristic parameter range of the self-spraying production period is the front end of the cumulative output inflection point and the set time before the start of production time; The starting point of the artificial intervention period is the self-spraying production period.

10. A gas well chemical-assisted drainage and well selection system, characterized in that: The system comprises: A data acquisition module, used to obtain key data of gas wells; A calculation module, used for calculating the surplus score of the gas well according to the key data of the gas well; The judgment module is used to determine a suitable reagent-assisted drainage process for the gas well according to the surplus score of the gas well.

11. The gas well chemical-assisted drainage and well selection system according to claim 10, characterized in that: The system further comprises: A prediction module is used to determine the production stage of the gas well, and the production stage of the gas well includes: There are three production stages, namely, rapid drainage stage, self-flowing production stage and artificial intervention stage. When the production stage of the gas well is the stage before the artificial intervention stage, it is determined that the suitable chemical-assisted drainage process for the gas well is the old well chemical-assisted drainage process.

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