A potential analysis method for resuming production of idle wells
The method objectively predicts idle well production potential using pre-shutdown data to enhance judgment accuracy and efficiency.
Patent Information
- Application Number
- CN202011430647.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2040-12-07
AI Technical Summary
Existing methods for determining the potential of idle oil wells to resume production are subjective and inaccurate, leading to wasted development costs and reduced efficiency due to inconsistent personnel judgments.
A method that objectively analyzes the potential of idle wells by using pre-shutdown production data, such as liquid production index, flow pressure, and static pressure, to predict daily liquid production and pump depth, thereby improving judgment accuracy.
Enhances the accuracy and effectiveness of determining whether idle wells can resume production by using quantifiable data, reducing waste and increasing efficiency.
Smart Images
Figure CN114607350B_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application belong to the technical field of oilfield development, and in particular to a method for analyzing the potential of resuming production of idle wells. Background Art
[0002] During the development of oil fields, as the production dynamics of oil wells change, affected by many factors such as wellbore failures, production capacity, and increased water content of the oil wells themselves, when the production capacity of the oil wells cannot meet the economic indicators set for them, the oil wells will be forced to shut down and stop production.
[0003] After an oil well has been shut down for a period of time, it may have the potential to resume production due to changes in the formation dynamics. In the related art, whether a shut-down oil well (or "idle well") can resume production is usually determined based on production experience.
[0004] However, since production experience is mixed with many subjective factors and the production experience of different personnel is different, it is impossible to objectively and accurately analyze and judge the potential of idle wells to resume production, which leads to the production potential of idle wells not being tapped in time, or the production capacity of idle wells after resuming production does not meet the expected results, ultimately wasting development costs and reducing work efficiency. Summary of the invention
[0005] The present application provides a method for analyzing the potential of idle wells to resume production, which can be used to improve the accuracy and effectiveness of potential judgment of idle oil wells. The method includes:
[0006] Obtain the liquid production index of the target idle well before it stops production;
[0007] When the wellbore of the target idle well meets the target condition, based on the liquid production index before the shutdown, predicting the daily liquid production of the target idle well after it is put into production;
[0008] Calculate the predicted depth of the oil well pump into the well based on the daily liquid production after the production starts and the liquid production index before the production stops;
[0009] When the predicted depth is less than the target depth, it is determined that the target idle well has the potential to resume production.
[0010] In one example, obtaining the liquid production index of the target idle well before stopping production includes:
[0011] Acquiring production data of the target idle well before it stops production;
[0012] Based on the production data before the production suspension, the liquid production index before the production suspension is calculated.
[0013] In one example, the production data before the production stoppage includes: daily liquid production before the production stoppage, flow pressure before the production stoppage, and static pressure before the production stoppage;
[0014] The calculating the liquid extraction index before the suspension of production based on the production data before the suspension of production includes:
[0015] determining a pressure difference between the flow pressure before the shutdown and the static pressure before the shutdown;
[0016] The liquid production index before the production stoppage is calculated based on the pressure difference between the flow pressure before the production stoppage and the static pressure before the production stoppage, and the daily liquid production before the production stoppage.
[0017] In one example, predicting the daily liquid production of the target idle well after it is put into production based on the liquid production index before the shutdown includes:
[0018] Acquiring the bottom hole pressure of the target idle well;
[0019] Obtaining a design flow pressure of the target idle well;
[0020] determining a pressure difference between the bottom hole pressure and the design flowing pressure;
[0021] Based on the pressure difference between the bottom hole pressure and the designed flow pressure, and the liquid production index before the shutdown, the daily liquid production after the production is put into operation is predicted.
[0022] In one example, obtaining the bottom hole pressure of the target idle well includes:
[0023] In a case where the target idle well has wellhead pressure, obtaining the wellhead pressure;
[0024] Obtaining the depth of the middle oil layer of the target idle well;
[0025] Obtaining the fluid density in the wellbore of the target idle well;
[0026] Calculating the submergence pressure of the middle portion of the oil layer of the target idle well based on the depth of the middle portion of the oil layer and the fluid density in the wellbore;
[0027] The bottom hole pressure is calculated based on the submergence pressure in the middle of the oil layer and the wellhead pressure.
[0028] In one example, obtaining the bottom hole pressure of the target idle well includes:
[0029] In the case where the target idle well has no wellhead pressure, obtaining a current static liquid level depth of the target idle well;
[0030] Obtaining the depth of the middle oil layer of the target idle well;
[0031] Determining the depth difference between the depth of the middle of the oil layer and the current static liquid level depth;
[0032] Obtaining the fluid density in the wellbore of the target idle well;
[0033] The bottom hole pressure is calculated based on the depth difference between the depth of the middle of the oil layer and the current static liquid level depth, and the fluid density in the wellbore.
[0034] In one example, the production data before the production stoppage includes: daily liquid production before the production stoppage, dynamic liquid level depth before the production stoppage, and static liquid level depth before the production stoppage;
[0035] The calculating the liquid extraction index before the suspension of production based on the production data before the suspension of production includes:
[0036] Determining a depth difference between the dynamic liquid level depth before the production stoppage and the static liquid level depth before the production stoppage;
[0037] The liquid extraction depth before the production stoppage is calculated based on the depth difference between the dynamic liquid level depth before the production stoppage and the static liquid level depth before the production stoppage, and the daily liquid production before the production stoppage.
[0038] In one example, predicting the daily liquid production of the target idle well after it is put into production based on the liquid production index before the shutdown includes:
[0039] Obtaining a designed dynamic liquid level depth of the target idle well;
[0040] Obtaining the current static liquid level depth of the target idle well;
[0041] determining a depth difference between the designed dynamic liquid level depth and the current static liquid level depth;
[0042] Based on the depth difference between the designed dynamic liquid level depth and the current static liquid level depth, and the liquid production index before the shutdown, the daily liquid production after the production is put into operation is predicted.
[0043] In one example, the calculating the predicted depth of the oil well pump into the well based on the daily liquid production after the production is put into operation and the liquid production index before the production is stopped includes:
[0044] Acquiring the bottom hole pressure of the target idle well;
[0045] Calculating the dynamic liquid level subsidence depth of the target idle well based on the bottom hole pressure, the daily liquid production after production, and the liquid production index before production suspension;
[0046] Obtaining the depth of the middle oil layer of the target idle well;
[0047] Obtaining a target sinking depth, where the target sinking depth refers to the sinking depth that the target idle well needs to maintain during production;
[0048] The predicted depth is calculated based on the depth of the middle part of the oil layer, the dynamic liquid surface sinking depth and the target sinking depth.
[0049] In one example, the method further includes:
[0050] When the wellbore does not meet the target condition, obtaining the designed depth of the oil pump lowered into the well;
[0051] Based on the design depth and the liquid production index before shutdown, predicting the daily liquid production of the target idle well after it is put into production;
[0052] In the case that the daily liquid production after the production is put into production is greater than the target daily liquid production, it is determined that the target idle well has the potential to resume production.
[0053] The technical solution provided in the embodiment of the present application is aimed at an oil well that has been idle for a long time after being shut down. Based on various data before the oil well was shut down, the daily liquid production of the oil well after being put into production is predicted, and the depth of the oil pump in the well after the oil well is put into production is calculated, and then based on the daily liquid production and / or the depth of the well after being put into production, whether the oil well has the potential to resume production is judged. Since the judgment of whether an oil well that has been idle for a long time in the embodiment of the present application has the potential to resume production is based on various data before the oil well was shut down, and these data are all obtained through query and / or testing, which is easy to obtain and objectively prepared, thereby improving the accuracy and effectiveness of potential judgment. BRIEF DESCRIPTION OF THE DRAWINGS
[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0055] Figure 1 is a flow chart of a method for analyzing the potential of resuming production of an idle well provided by an embodiment of the present application;
[0056] Figure 2 is a schematic diagram of formation pressure when wellhead pressure exists provided by one embodiment of the present application;
[0057] Figure 3 It is a schematic diagram of formation pressure when there is no wellhead pressure provided by an embodiment of the present application. DETAILED DESCRIPTION
[0058] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of methods consistent with some aspects of the present application as described in detail in the present application.
[0059] Please refer to Figure 1 , which shows a flow chart of a method for analyzing the potential of resuming production of an idle well provided by an embodiment of the present application. The method may include the following steps.
[0060] Step 110, obtaining the liquid production index of the target idle well before stopping production.
[0061] Target idle wells refer to oil wells that have been out of production for a long time, such as oil wells that have been out of production for two years.
[0062] The liquid production index of the target idle well refers to the value of the change in liquid production of the target idle well when the production pressure difference of the target idle well changes by one unit.
[0063] It can be seen that the liquid production index of the target idle well is a key indicator of the production capacity of the target idle well. In the embodiment of the present application, it is necessary to predict the daily liquid production of the target idle well after it is put into production based on the liquid production index of the target idle well before it is shut down, so as to judge whether the target idle well has the potential to resume production. Therefore, it is necessary to first obtain the liquid production index of the target idle well before it is shut down.
[0064] In one example, the above step 110 includes: obtaining production data of the target idle well before the shutdown; and calculating the liquid production index before the shutdown based on the production data before the shutdown.
[0065] The production data before the suspension of production can be obtained by reviewing the relevant information of the target idle well before the suspension of production. The embodiment of the present application does not limit the specific content of the production data before the suspension of production. Optionally, the production data before the suspension of production includes at least one of the following: daily liquid production before the suspension of production, flow pressure before the suspension of production, static pressure before the suspension of production, dynamic liquid level depth before the suspension of production, and static liquid level depth before the suspension of production.
[0066] Among them, the flowing pressure before shutdown refers to the pressure in the middle of the oil layer during normal production before the target idle well is shut down; the static pressure before shutdown refers to the pressure in the middle of the oil layer when the pressure returns to stability after the target idle well is shut down.
[0067] For the specific calculation process of the liquid extraction index before suspension of production, please refer to the following method embodiment, which will not be described in detail here.
[0068] Step 120 , when the wellbore of the target idle well meets the target condition, based on the liquid production index before the shutdown, predict the daily liquid production of the target idle well after it is put into production.
[0069] During the development of oil fields, as the production dynamics of oil wells change, affected by many factors such as wellbore failures, production capacity, and water content increase, when the production capacity of an oil well cannot meet the economic indicators set for it, the oil well will be forced to shut down and stop production. Therefore, the possible reasons for the shutdown of the target idle wells include: the production capacity of the target idle wells before the shutdown is too low to generate economic benefits, and the wellbore of the target idle wells cannot meet the development and production requirements.
[0070] Generally, most oil wells that have been shut down and idled for a long time due to low production capacity will not have a significant impact on the oil pumps lowered into the wellbore. However, according to the above introduction, oil wells may also be shut down and idled due to casing deformation, shrinkage and other reasons. Therefore, when judging whether the target idle well has the potential to resume production, different potential judgment methods need to be adopted according to the different conditions of the target idle well's wellbore.
[0071] Data related to the wellbore condition of the target idle well can be obtained by querying the wellbore structure data of the target idle well.
[0072] When the wellbore of the target idle well meets the target conditions, the daily liquid production of the target idle well after it is put into production is further predicted based on the liquid production index before the shutdown. The target conditions include that the wellbore of the target idle well is in good condition, for example, the casing in the well has no deformation, shrinkage, etc.
[0073] For the specific prediction process of the daily liquid production of the target idle well after it is put into production, please refer to the following method embodiment, which will not be described in detail here.
[0074] Step 130, based on the daily liquid production after production starts and the liquid production index before production stops, calculate the predicted depth of the oil well pump into the well.
[0075] Generally, the greater the expected daily fluid production, the deeper the oil pump is lowered into the well; similarly, the deeper the oil pump is lowered into the well, the greater the expected daily fluid production.
[0076] Therefore, it is necessary to comprehensively consider the expected daily liquid production and the depth of the oil pump into the well to determine whether the target idle well has the potential to resume production.
[0077] In one example, the above step 130 includes: obtaining the bottom hole pressure of the target idle well; calculating the dynamic liquid surface sinking depth of the target idle well based on the bottom hole pressure, the daily liquid production after production, and the liquid production index before shutdown; obtaining the depth of the middle part of the oil layer of the target idle well; obtaining the target sinking depth, the target sinking depth refers to the sinking depth that needs to be maintained during production of the target idle well; calculating the predicted depth based on the depth of the middle part of the oil layer, the dynamic liquid surface sinking depth and the target sinking depth.
[0078] Optionally, make the following assumptions for each parameter:
[0079] The bottom hole pressure of the target idle well is P 井底 , the unit is 10 6 Pa;
[0080] The depth of the middle reservoir of the target idle well is H 中 , unit is m;
[0081] The target sinking depth is H 沉 , in m, optionally, the target sinking depth is 200 m;
[0082] The predicted depth is H 泵 , unit is m;
[0083] The liquid production index of the target idle well before stopping production is K, in m 3 / (10 6 Pa·d).
[0084] Then the sinking depth of the moving liquid surface is:
[0085] (P 井底 -Q 预 / K) / (ρ*g).
[0086] The predicted depth of the oil well pump into the well is as follows:
[0087] H 泵 =H 中 -(P 井底 -Q 预 / K) / (ρ*g)+H 沉 .
[0088] Step 140: When the predicted depth is less than the target depth, determine whether the target idle well has the potential to resume production.
[0089] Based on the wellbore condition of the target idle well, etc., the maximum depth that the oil pump can be lowered into the target idle well, i.e., the target depth, can be determined. When the predicted depth is less than the target depth, it can be determined that the target idle well has the potential to resume production.
[0090] The above example describes how to determine whether the target idle well has the potential to resume production when the wellbore of the target idle well meets the target condition. For the case where the wellbore of the target idle well does not meet the target condition, the embodiment of the present application also provides a corresponding determination method, as shown below.
[0091] In one example, the method further includes: when the wellbore does not meet the target conditions, obtaining the designed depth of the oil pump into the well; based on the designed depth and the liquid production index before shutdown, predicting the daily liquid production of the target idle well after it is put into production; when the daily liquid production after production is greater than the target daily liquid production, determining that the target idle well has the potential to resume production.
[0092] That is, based on the designed depth of the oil pump in the well, the daily liquid production of the target idle well after it is put into production is reversed. If the daily liquid production after production meets the expected requirements, it is determined that the target idle well has the potential to resume production.
[0093] In summary, the technical solution provided in the embodiment of the present application is aimed at an oil well that has been idle for a long time after being shut down. Based on various data before the oil well was shut down, the daily liquid production of the oil well after being put into production is predicted, and the depth of the oil pump in the well after the oil well is put into production is calculated, and then based on the daily liquid production and / or the depth of the well after being put into production, whether the oil well has the potential to resume production is judged. Since the judgment of whether an oil well that has been idle for a long time in the embodiment of the present application has the potential to resume production is based on various data before the oil well was shut down, and these data are all obtained through query and / or testing, which is easy to obtain and objectively prepared, thereby improving the accuracy and effectiveness of potential judgment.
[0094] In one example, the production data before production suspension includes: daily liquid production before production suspension, flow pressure before production suspension, and static pressure before production suspension; the above-mentioned calculation of the liquid production index before production suspension based on the production data before production suspension includes: determining the pressure difference between the flow pressure before production suspension and the static pressure before production suspension; calculating the liquid production index before production suspension based on the pressure difference between the flow pressure before production suspension and the static pressure before production suspension, as well as the daily liquid production before production suspension.
[0095] Optionally, make the following assumptions for each parameter:
[0096] The daily liquid production of the target idle well before stopping production is Q, in m 3 / d (cubic meters / day);
[0097] The flow pressure of the target idle well before stopping production is P 流 , the unit is 10 6 Pa (Pascal);
[0098] The static pressure of the target idle well before stopping production is P 静 , the unit is 10 6 Pa;
[0099] The liquid production index of the target idle well before stopping production is K, in m 3 / (10 6 Pa·d).
[0100] Based on the above example, the liquid production index of the target idle well before shutdown is as follows:
[0101] K=Q / (P 静 -P 流 ).
[0102] Based on this, in one example, the above-mentioned prediction of the daily liquid production of the target idle well after it is put into production based on the liquid production index before shutdown includes: obtaining the bottom hole pressure of the target idle well; obtaining the design flow pressure of the target idle well; determining the pressure difference between the bottom hole pressure and the design flow pressure; based on the pressure difference between the bottom hole pressure and the design flow pressure, and the liquid production index before shutdown, predicting the daily liquid production after production.
[0103] Optionally, make the following assumptions for each parameter:
[0104] The bottom hole pressure of the target idle well is P 井底 , the unit is 10 6 Pa;
[0105] The design flow pressure of the target idle well is P 预流 , the unit is 10 6 Pa;
[0106] The daily liquid output after production is Q 预 , unit is m 3 / d.
[0107] Based on the above example, the daily liquid production of the target idle well after it is put into production is as follows:
[0108] Q 预 =K×(P 井底 -P 预流 ).
[0109] The bottom hole pressure of the target idle well has different acquisition methods depending on the wellhead pressure of the target idle well. When the target idle well has wellhead pressure, the bottom hole pressure of the target idle well is the sum of the submergence pressure in the middle of the oil layer and the wellhead pressure; when the target idle well does not have wellhead pressure, the bottom hole pressure of the target idle well is the submergence pressure in the middle of the oil layer.
[0110] Based on this, please refer to Figure 2 In one example, the above-mentioned obtaining of the bottom hole pressure of the target idle well includes: obtaining the wellhead pressure when there is wellhead pressure in the target idle well; obtaining the depth of the middle of the oil layer of the target idle well; obtaining the fluid density in the wellbore of the target idle well; calculating the sinking pressure in the middle of the oil layer of the target idle well based on the depth of the middle of the oil layer and the fluid density in the wellbore; calculating the bottom hole pressure based on the sinking pressure in the middle of the oil layer and the wellhead pressure.
[0111] Optionally, make the following assumptions for each parameter:
[0112] The wellhead pressure of the target idle well is P 井口 , the unit is 10 6 Pa;
[0113] The depth of the middle reservoir of the target idle well is H 中 , unit is m;
[0114] The fluid density in the target idle well is ρ, in kg / m 3 (kg / m3);
[0115] The acceleration due to gravity is g, and its unit is m / s 2 (meters per second squared).
[0116] Then the sinking pressure in the middle of the target idle well oil layer is:
[0117] H 中 ×ρ×g.
[0118] The bottom hole pressure of the target idle well is as follows:
[0119] P 井底 =H 中 ×ρ×g+P 井口 .
[0120] Based on this, please refer to Figure 3 In another example, the above-mentioned obtaining of the bottom hole pressure of the target idle well includes: obtaining the current static liquid level depth of the target idle well when there is no wellhead pressure in the target idle well; obtaining the depth of the middle of the oil layer of the target idle well; determining the depth difference between the depth of the middle of the oil layer and the current static liquid level depth; obtaining the fluid density in the wellbore of the target idle well; and calculating the bottom hole pressure based on the depth difference between the depth of the middle of the oil layer and the current static liquid level depth, and the fluid density in the wellbore.
[0121] Optionally, make the following assumptions for each parameter:
[0122] The depth of the middle reservoir of the target idle well is H 中 , unit is m;
[0123] The fluid density in the target idle well is ρ, in kg / m 3 (kg / m3);
[0124] The acceleration due to gravity is g, and its unit is m / s 2 (meters per second squared);
[0125] The current static liquid level depth of the target idle well is H 静 , unit is m.
[0126] The bottom hole pressure of the target idle well is as follows:
[0127] P 井底 =(H 中 -H 静 )×ρ×g.
[0128] Optionally, the wellhead pressure of the target idle well or the current static liquid level depth of the target idle well may be measured at the wellhead of the target idle well using an echo sounder.
[0129] In another example, the production data before production suspension includes: daily liquid production before production suspension, dynamic liquid level depth before production suspension, and static liquid level depth before production suspension; the above-mentioned calculation of the liquid production index before production suspension based on the production data before production suspension includes: determining the depth difference between the dynamic liquid level depth before production suspension and the static liquid level depth before production suspension; calculating the liquid production depth before production suspension based on the depth difference between the dynamic liquid level depth before production suspension and the static liquid level depth before production suspension, as well as the daily liquid production before production suspension.
[0130] Optionally, make the following assumptions for each parameter:
[0131] The daily liquid output before the shutdown is Q, in m 3 / d;
[0132] The dynamic liquid level depth before stopping production is H 动 , the unit is m (meter);
[0133] The static liquid level depth before the shutdown is H 静1 , unit is m;
[0134] The liquid extraction index before the shutdown is J, in m 3 / (m·d).
[0135] Based on the above example, the liquid production index of the target idle well before shutdown is as follows:
[0136] J=Q / (H 动 –H 静1 ).
[0137] Based on this, in one example, the above-mentioned prediction of the daily liquid production of the target idle well after it is put into production based on the liquid production index before shutdown includes: obtaining the designed dynamic liquid level depth of the target idle well; obtaining the current static liquid level depth of the target idle well; determining the depth difference between the designed dynamic liquid level depth and the current static liquid level depth; based on the depth difference between the designed dynamic liquid level depth and the current static liquid level depth, and the liquid production index before shutdown, predicting the daily liquid production after production.
[0138] Optionally, make the following assumptions for each parameter:
[0139] The design dynamic liquid level depth of the target idle well is H 预动 , unit is m;
[0140] The current static liquid level depth of the target idle well is H 静 , unit is m;
[0141] The daily liquid output after production is Q 预 , unit is m 3 / d.
[0142] Based on the above example, the daily liquid production of the target idle well after it is put into production is as follows:
[0143] Q 预 =J×(H 预动 -H 静 ).
[0144] To sum up, the technical solution provided in the embodiment of the present application is aimed at oil wells that have been idle for a long time after being shut down. According to different recording methods of the production data of the oil well before the shutdown, different methods of predicting the daily liquid production of the oil well after the oil well is put into production are provided, thereby improving the applicability and flexibility of the solution.
Claims
1. A method for analyzing the potential of resuming production of an idle well, characterized in that: The method comprises: Obtain the liquid production index of the target idle well before it stops production; In the case where the wellbore of the target idle well meets the target condition, the bottom hole pressure of the target idle well is obtained; the design flow pressure of the target idle well is obtained; the pressure difference between the bottom hole pressure and the design flow pressure is determined; based on the pressure difference between the bottom hole pressure and the design flow pressure, and the liquid production index before the shutdown, the daily liquid production of the target idle well after it is put into production is predicted, wherein the target condition includes that the wellbore of the target idle well is in good condition; Based on the bottom hole pressure, the daily liquid production after production and the liquid production index before production suspension, the dynamic liquid surface sinking depth of the target idle well is calculated; the depth of the middle part of the oil layer of the target idle well is obtained; the target sinking depth is obtained, and the target sinking depth refers to the sinking depth that needs to be maintained when the target idle well is in production; based on the depth of the middle part of the oil layer, the dynamic liquid surface sinking depth and the target sinking depth, the predicted depth of the oil pump lowered into the well is calculated; When the predicted depth is less than the target depth, the target idle well is determined to have the potential to resume production. The target depth is the maximum depth at which the oil pump can be lowered into the target idle well based on the wellbore condition of the target idle well.
2. The method according to claim 1, characterized in that The step of obtaining the liquid production index of the target idle well before stopping production includes: Acquiring production data of the target idle well before it stops production; Based on the production data before the production suspension, the liquid production index before the production suspension is calculated.
3. The method according to claim 2, characterized in that The production data before the suspension of production include: daily liquid production before the suspension of production, flow pressure before the suspension of production, and static pressure before the suspension of production; The calculating the liquid extraction index before the suspension of production based on the production data before the suspension of production includes: determining a pressure difference between the flow pressure before the shutdown and the static pressure before the shutdown; The liquid production index before the production stoppage is calculated based on the pressure difference between the flow pressure before the production stoppage and the static pressure before the production stoppage, and the daily liquid production before the production stoppage.
4. The method according to claim 1, characterized in that: The obtaining of the bottom hole pressure of the target idle well comprises: In a case where the target idle well has wellhead pressure, obtaining the wellhead pressure; Obtaining the depth of the middle oil layer of the target idle well; Obtaining the fluid density in the wellbore of the target idle well; Calculating the submergence pressure of the middle portion of the oil layer of the target idle well based on the depth of the middle portion of the oil layer and the fluid density in the wellbore; The bottom hole pressure is calculated based on the submergence pressure in the middle of the oil layer and the wellhead pressure.
5. The method according to claim 1, characterized in that The obtaining of the bottom hole pressure of the target idle well comprises: In the case where the target idle well has no wellhead pressure, obtaining a current static liquid level depth of the target idle well; Obtaining the depth of the middle oil layer of the target idle well; Determining the depth difference between the depth of the middle of the oil layer and the current static liquid level depth; Obtaining the fluid density in the wellbore of the target idle well; The bottom hole pressure is calculated based on the depth difference between the depth of the middle of the oil layer and the current static liquid level depth, and the fluid density in the wellbore.
6. The method according to any one of claims 1 to 5, characterized in that: The method further comprises: When the wellbore does not meet the target condition, obtaining the designed depth of the oil pump lowered into the well; Based on the design depth and the liquid production index before shutdown, predicting the daily liquid production of the target idle well after it is put into production; In the case that the daily liquid production after the production is put into production is greater than the target daily liquid production, it is determined that the target idle well has the potential to resume production.
7. A method for analyzing the potential of resuming production of idle wells, characterized in that: The method comprises: Obtain the liquid production index of the target idle well before it stops production; In the case where the wellbore of the target idle well meets the target condition, the designed dynamic liquid level depth of the target idle well is obtained; the current static liquid level depth of the target idle well is obtained; the depth difference between the designed dynamic liquid level depth and the current static liquid level depth is determined; based on the depth difference between the designed dynamic liquid level depth and the current static liquid level depth, and the liquid production index before the shutdown, the daily liquid production after the production is predicted; the target condition includes that the wellbore of the target idle well is in good condition; Obtain the bottom hole pressure of the target idle well; calculate the dynamic liquid surface sinking depth of the target idle well based on the bottom hole pressure, the daily liquid production after production and the liquid production index before shutdown; obtain the depth of the middle part of the oil layer of the target idle well; obtain the target sinking depth, which refers to the sinking depth that needs to be maintained when the target idle well is in production; calculate the predicted depth of the oil pump lowered into the well based on the depth of the middle part of the oil layer, the dynamic liquid surface sinking depth and the target sinking depth; When the predicted depth is less than the target depth, the target idle well is determined to have the potential to resume production. The target depth is the maximum depth at which the oil pump can be lowered into the target idle well based on the wellbore condition of the target idle well.
8. The method according to claim 7, characterized in that The step of obtaining the liquid production index of the target idle well before stopping production includes: Acquiring production data of the target idle well before it stops production; Based on the production data before the production suspension, the liquid production index before the production suspension is calculated.
9. The method according to claim 8, characterized in that The production data before the suspension of production include: daily liquid production before the suspension of production, dynamic liquid level depth before the suspension of production, and static liquid level depth before the suspension of production; The calculating the liquid extraction index before the suspension of production based on the production data before the suspension of production includes: Determining a depth difference between the dynamic liquid level depth before the production stoppage and the static liquid level depth before the production stoppage; The liquid production index before the production stoppage is calculated based on the depth difference between the dynamic liquid level depth before the production stoppage and the static liquid level depth before the production stoppage, and the daily liquid production before the production stoppage.
10. The method according to any one of claims 7 to 9, characterized in that: The method further comprises: When the wellbore does not meet the target condition, obtaining the designed depth of the oil pump lowered into the well; Based on the design depth and the liquid production index before shutdown, predicting the daily liquid production of the target idle well after it is put into production; In the case that the daily liquid production after the production is put into production is greater than the target daily liquid production, it is determined that the target idle well has the potential to resume production.