Method and device for selecting well for tapping potential in old gas field

Abstract

The application discloses a kind of old gas field measures to develop potential selected well method and device, can be used in oil and gas field exploration development field.Therein, the method includes: selecting the old gas field to develop potential;Establish the gas reservoir geological model of old gas field;With the gas reservoir geological model of old gas field as foundation, determine the remaining gas distribution law of gas reservoir of old gas field;According to the remaining gas distribution law of gas reservoir of old gas field, old well bore integrity evaluation result of old gas field, main control factor of old gas field low production or shut-down well, determine the old well measure potential of old gas field to develop potential;According to the gas reservoir geological characteristics of old gas field, determine the old well measure data of old gas field to develop potential;According to the old well measure potential of old gas field, old well measure data of old gas field to develop potential, determine the well site of old gas field to develop potential;Economic and risk prediction is carried out to the well site of old gas field to develop potential.The application can accurately evaluate the potential of old gas field to develop potential, improve the effect and economic benefit of old gas field measure to develop potential.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field exploration and development technology, and in particular to a method and apparatus for tapping the potential of developed old gas fields. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] Natural gas, as a relatively clean energy source, is a key focus for the long-term development of the energy industry. Exploring the potential of old gas fields plays a crucial role in revitalizing untapped and undeveloped reserves, and in achieving stable and increased production in these fields.

[0004] Currently, the methods for selecting wells for potential tapping in old gas fields mainly rely on single technologies, and are primarily based on oil reservoir tapping technologies, with fewer gas reservoir tapping technologies. A unified method for selecting wells for potential tapping in developed old gas fields has not yet been formed.

[0005] As old gas fields enter the middle and late stages of development, the quality of untapped and difficult-to-develop reserves is low, making their development challenging and failing to meet the needs of revitalizing and stabilizing production. Since secondary development and revitalization of developed old gas fields require tapping into their potential through various measures, current research on well selection methods for this purpose is relatively weak, resulting in poor effectiveness and low economic benefits. Summary of the Invention

[0006] This invention provides a well selection method for tapping the potential of developed old gas fields, which is used to accurately evaluate the potential of old gas fields and improve the effectiveness and economic benefits of tapping the potential of old gas fields. The method includes:

[0007] Selected old gas fields for potential tapping;

[0008] Based on the gas reservoir data of the old gas field, determine the gas reservoir characteristics of the old gas field, determine the gas reservoir geological features and geological potential tapping direction of the old gas field based on the gas reservoir characteristics of the old gas field, and establish the gas reservoir geological model of the old gas field based on the gas reservoir geological features and geological potential tapping direction.

[0009] Based on the geological model of the gas reservoir in the old gas field, the distribution pattern of the remaining gas in the gas reservoir of the old gas field is determined through gas reservoir engineering research and historical fitting.

[0010] Based on the well history data, field exploration data, and downhole operation data of the old gas field, the wellbore integrity evaluation results of the old gas field are determined;

[0011] Based on the gas reservoir characteristics, drilling and completion technology, and gas production technology of old gas fields, determine the main controlling factors of low-production or shut-down wells in old gas fields;

[0012] Based on the distribution pattern of residual gas in the gas reservoir of the old gas field, the evaluation results of the integrity of the old wells in the old gas field, and the main controlling factors of low-production or shut-down wells in the old gas field, the evaluation results of the potential tapping of old well measures in the old gas field are determined.

[0013] Based on the geological characteristics of the gas reservoirs in old gas fields, determine the technological data for tapping the potential of old wells in old gas fields;

[0014] Based on the evaluation results of the potential tapping of old wells in old gas fields and the technical data of the potential tapping of old wells in old gas fields, the locations of potential tapping wells in old gas fields are determined.

[0015] Economic and risk predictions were made for potential well locations in old gas fields. Based on the results of the economic and risk predictions, potential wells for potential tapping in old gas fields were selected and ranked.

[0016] This invention also provides a well selection device for tapping the potential of developed old gas fields, used to accurately evaluate the potential of old gas fields and improve the effectiveness and economic benefits of tapping old gas field measures. The device includes:

[0017] The old gas field selection module is used to select old gas fields with potential for further development.

[0018] The geological model building module is used to determine the gas reservoir characteristics of old gas fields based on the gas reservoir data, determine the geological features and geological potential tapping directions of old gas fields based on the gas reservoir characteristics, and build a geological model of old gas fields based on the gas reservoir geological features and geological potential tapping directions.

[0019] The distribution pattern determination module is used to determine the distribution pattern of residual gas in old gas fields based on the gas reservoir geological model of old gas fields, through gas reservoir engineering research and historical fitting.

[0020] The integrity assessment module is used to determine the integrity assessment results of old wells in old gas fields based on well history data, field exploration data, and downhole operation data.

[0021] The main control factor determination module is used to determine the main control factors of low-production or shut-down wells in old gas fields based on the reservoir characteristics, drilling and completion technology and gas production technology of old gas fields.

[0022] The potential tapping evaluation module is used to determine the potential tapping evaluation results of old well measures in old gas fields based on the distribution pattern of residual gas in gas reservoirs, the evaluation results of the integrity of old wells in old gas fields, and the main controlling factors of low-production or shut-down wells in old gas fields.

[0023] The potential tapping technology determination module is used to determine the technical data of potential tapping technology for old wells in old gas fields based on the geological characteristics of the gas reservoirs.

[0024] The well location determination module is used to determine the well locations for tapping potential in old gas fields based on the evaluation results of the tapping potential of old well measures and the technological data of tapping potential of old well measures in old gas fields.

[0025] The old gas field potential tapping well selection module is used to perform economic and risk predictions on potential tapping well locations in old gas fields. Based on the economic and risk prediction results, it selects potential tapping wells in old gas fields and sorts the selected wells.

[0026] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-mentioned method for tapping potential and selecting wells in developed old gas fields.

[0027] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for tapping potential and selecting wells in developed old gas fields.

[0028] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-mentioned method for tapping potential and selecting wells in developed old gas fields.

[0029] This invention provides a well selection scheme for tapping potential in developed old gas fields. The scheme involves selecting an old gas field for potential tapping; determining the reservoir characteristics based on reservoir data; identifying the reservoir's geological features and potential tapping direction based on these features; establishing a reservoir geological model based on these features; determining the remaining gas distribution pattern through reservoir engineering research and historical data fitting; evaluating the wellbore integrity of old wells based on well history data, field exploration data, and downhole operation data; and finally, considering the reservoir characteristics, drilling and completion techniques, and gas production techniques... This method involves several steps: first, identifying the key controlling factors for low-production or shut-down wells in old gas fields; second, determining the evaluation results of the potential for tapping old wells based on the distribution patterns of residual gas in the reservoir, the evaluation results of the integrity of old wells, and the key controlling factors for low-production or shut-down wells; third, determining the technological data for tapping old wells based on the geological characteristics of the reservoir; fourth, determining the locations of tapping wells based on the evaluation results and the technological data; fifth, conducting economic and risk predictions for the locations of these tapping wells; and finally, selecting and ranking the selected old wells for tapping. Compared with existing technologies where research on well selection methods for tapping old gas field potential is relatively weak, resulting in poor tapping effects and low economic benefits, this method can accurately evaluate the potential of old gas fields and improve the effectiveness and economic benefits of tapping old gas field potential. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0031] Figure 1 This is a flowchart of the well selection method for tapping the potential of old gas fields, as described in this embodiment of the invention.

[0032] Figure 2 This is a schematic diagram of parameters for evaluating the potential tapping of old gas fields in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of parameters for evaluating the potential tapping of old wells in an old gas field, as described in an embodiment of the present invention.

[0034] Figure 4 This is a flowchart illustrating the implementation of the well selection method for tapping the potential of old gas fields in this invention.

[0035] Figure 5 This is a schematic diagram of a well selection device for tapping the potential of old gas fields, as described in an embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0037] In this document, the term "and / or" merely describes a relationship, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0038] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.

[0039] As mentioned earlier, natural gas, as a relatively clean energy source, is a key focus of the energy industry's long-term development. Developing the potential of old gas fields plays a crucial role in revitalizing difficult-to-access and untapped reserves, and achieving stable and increased production. Currently, well selection methods for developing potential in old gas fields mainly rely on single technologies, primarily oil reservoir development techniques, with fewer gas reservoir development techniques available. A unified well selection method for developing potential in developed old gas fields has not yet been established. In the mid-to-late stages of development, the quality of difficult-to-access and untapped reserves is low, making them difficult to access and meet the needs for revitalizing and stabilizing old gas fields. Due to the secondary development and revitalization of developed old gas fields...

[0040] Gas fields need to carry out potential tapping of old gas field measures. At present, the research on well selection methods for potential tapping of old gas field measures is relatively weak. The effect of tapping potential of old gas field measures is poor and the economic benefits are low, which seriously restricts the effective utilization of difficult-to-develop reserves in old gas fields. There is an urgent need for a well selection method for potential tapping of measures to ensure the tapping effect of the selected wells and improve the economic benefits of potential tapping of measures.

[0041] Based on this, this invention provides a method for selecting wells to tap the potential of developed old gas fields, such as... Figure 1 As shown, the method includes:

[0042] Step 101: Select an old gas field for potential tapping;

[0043] Step 102: Determine the gas reservoir characteristics of the old gas field based on the gas reservoir data, determine the geological features and geological potential tapping direction of the old gas field based on the gas reservoir characteristics, and establish the gas reservoir geological model of the old gas field based on the gas reservoir geological features and geological potential tapping direction.

[0044] Step 103: Based on the geological model of the gas reservoir in the old gas field, determine the distribution pattern of the remaining gas in the old gas reservoir through gas reservoir engineering research and historical fitting.

[0045] Step 104: Based on the well history data, field exploration data, and downhole operation data of the old gas field, determine the old gas field.

[0046] Evaluation results of the integrity of the old well shaft;

[0047] Step 105: Based on the gas reservoir characteristics, drilling and completion technology, and gas production technology of the old gas field, determine the main controlling factors of low-production or shut-down wells in the old gas field.

[0048] Step 106: Based on the distribution pattern of residual gas in the gas reservoir of the old gas field, the evaluation results of the integrity of the old wells in the old gas field, and the main controlling factors of low-production or shut-down wells in the old gas field, determine the evaluation results of the potential tapping of old well measures in the old gas field.

[0049] Step 107: Determine the technical data for tapping the potential of old wells in old gas fields based on the geological characteristics of the gas reservoirs;

[0050] Step 108: Based on the evaluation results of the potential tapping of old wells in the old gas field and the technical data of the potential tapping of old wells in the old gas field, determine the locations of potential tapping wells in the old gas field;

[0051] Step 109: Conduct economic and risk predictions for potential tapping well locations in old gas fields. Based on the economic and risk prediction results, select potential tapping wells for old gas fields and rank the selected wells.

[0052] Compared with existing technologies where research on well selection methods for tapping potential in old gas fields is relatively weak, resulting in poor tapping effects and low economic benefits, the well selection method for tapping potential in old gas fields provided in this invention can accurately evaluate the tapping potential of old gas fields and improve the tapping effect and economic benefits of old gas field measures.

[0053] The following example details the steps of the well selection method for tapping potential in developed old gas fields, namely steps 101 to 109 above.

[0054] In one embodiment, in step 101 above, an old gas field with potential for development is selected based on its source rock, reservoir conditions, preservation conditions, trap conditions, supporting facilities, reserves, and development conditions.

[0055] In specific implementation, such as Figure 2 The parameter diagram for evaluating the potential of old gas fields is shown below. Old gas fields for potential tapping are selected according to the following formula:

[0056] P1 = P T ×P C ×P Q ×P B ×P P ×P S ×P K

[0057] In the formula: P1 represents the evaluation result of tapping the potential of old gas fields; P T Indicates source rock parameters; P C Represents reservoir condition parameters; P Q Indicates the conditional parameters to be saved; P B P represents the trap condition parameter; P Indicates the supporting condition parameters; P S Indicates the reserve condition parameter; P K This represents the development condition parameters.

[0058] The different parameters in the above formula are obtained by dividing the sum of the scores of the influencing factors corresponding to the parameters by the number of influencing factors. The influencing factors are preset before calculation.

[0059] In one embodiment, in step 102 above, the gas reservoir data of the old gas field includes: drilling data, logging data, well logging data, coring data, seismic data, dynamic monitoring data, production dynamic data, well history and measures data of the old gas field.

[0060] In one embodiment, in step 102 above, determining the gas reservoir characteristics of an old gas field based on its gas reservoir data includes: determining the gas reservoir characteristics of an old gas field by analyzing its strata, faults, structures, sedimentary microfacies, reservoirs, gas reservoirs, and reserves based on the gas reservoir data of the old gas field.

[0061] In one embodiment, in step 103 above, based on the geological model of the old gas field reservoir, the distribution pattern of the remaining gas in the old gas field reservoir is determined through reservoir engineering research and historical fitting. This includes: based on the geological model of the old gas field reservoir, the distribution pattern of the remaining gas in the old gas field reservoir is determined by analyzing geological factors, wellbore factors, technological factors, reservoir engineering evaluation data, numerical simulation data, well history analysis data, field exploration data, and downhole operation data of the old gas field.

[0062] In one embodiment, in step 104 above, after a long period of production, the wellbore conditions change significantly. It is necessary to determine the wellbore integrity evaluation results of the old gas field based on the well history data, field exploration data, and downhole operation data of the old gas field, and determine the conditions for tapping potential construction that the old well can undertake based on the evaluation results.

[0063] In one embodiment, in step 106 above, the evaluation result of the potential for tapping old well measures in the old gas field is determined based on the distribution pattern of residual gas in the gas reservoir, the evaluation result of the integrity of old wells in the old gas field, and the main controlling factors of low-production or shut-down wells in the old gas field.

[0064] In specific implementation, such as Figure 3 The parameter diagram for evaluating the potential tapping of old wells in old gas fields is shown below. Old wells in old gas fields are selected for potential tapping using the following formula:

[0065] P2 = P S2 ×P C2 ×P J ×P G ×P Y

[0066] In the formula: P2 represents the evaluation result of the potential tapping of old well measures in old gas fields; P S2 Indicates the reserve condition parameters of old wells; P C2 Indicates reservoir condition parameters of old wells; P J P represents the parameters indicating the evaluation results of the integrity of old wellbore in an old gas field. G This represents the key controlling factor parameter for low-production or shut-down wells in old gas fields; P Y This represents the process condition parameters for tapping potential; where P S P C P Y Determined based on the distribution pattern of residual gas in the gas reservoirs of old gas fields.

[0067] The different parameters in the above formula are obtained by dividing the sum of the scores of the influencing factors corresponding to the parameters by the number of influencing factors. The influencing factors are preset before calculation.

[0068] In one embodiment, in step 107 above, determining the old well potential tapping technology data of the old gas field based on the geological characteristics of the gas reservoir may include: selecting the optimal tapping technology based on the geological characteristics of the old gas field, and making targeted improvements to the existing technology according to the needs of old well potential tapping to meet the needs of potential tapping.

[0069] In one embodiment, in step 108 above, based on the evaluation results of the potential tapping potential of old well measures in the old gas field and the technological data of the potential tapping potential of old well measures in the old gas field, the potential tapping well locations of the old gas field are determined according to the tapping potential of measures such as well repair, perforation repair, water shut-off, profile adjustment, drainage and gas production, replenishment of formation energy, adjustment of production work system, reservoir stimulation, sidetracking, new well densification, and edge expansion.

[0070] In one embodiment, in step 109 above, the economic and risk prediction of the potential tapping well locations in the old gas field may include: predicting the cost of tapping the potential of old wells and the production increase development indicators; conducting single-well economic benefit analysis based on single wells; selecting old wells for potential tapping in the old gas field in combination with on-site construction conditions; and ranking the selected old wells.

[0071] The following is combined with Figure 4 Detailed implementation process of well selection methods for tapping potential in developed old gas fields:

[0072] Based on the source rocks, reservoir conditions, preservation conditions, trap conditions, supporting facilities, reserves, and development conditions of old gas fields, old gas fields are evaluated and selected for potential tapping.

[0073] Select the old gas fields for potential tapping using the following formula:

[0074] P1 = P T ×P C ×P Q ×P B ×P P ×P S ×P K

[0075] In the formula: P1 represents the evaluation result of tapping the potential of old gas fields; P T Indicates source rock parameters; P C Represents reservoir condition parameters; P Q Indicates the conditional parameters to be saved; P B P represents the trap condition parameter; P Indicates the supporting condition parameters; P S Indicates the reserve condition parameter; P K This represents the development condition parameters.

[0076] The different parameters in the above formula are obtained by dividing the sum of the scores of the influencing factors corresponding to the parameters by the number of influencing factors. The influencing factors are preset before calculation.

[0077] Collect gas reservoir data from old gas fields, including: drilling data, logging data, well logging data, coring data, seismic data, dynamic monitoring data, production dynamic data, well history and management data.

[0078] Based on the gas reservoir data of the old gas field, the gas reservoir of the old gas field is evaluated by analyzing the strata, faults, structures, sedimentary microfacies, reservoirs, gas reservoirs and reserves, the gas reservoir characteristics of the old gas field are determined, the geological features and geological potential tapping direction of the old gas field are determined based on the gas reservoir characteristics, and the gas reservoir geological model of the old gas field is established based on the gas reservoir geological features and geological potential tapping direction.

[0079] Based on the geological model of the gas reservoir in the old gas field, the distribution pattern of the remaining gas in the old gas reservoir is determined by analyzing the geological factors, wellbore factors, technological factors, gas reservoir engineering evaluation data, numerical simulation data, well history analysis data, field exploration data, and downhole operation data of the old gas field.

[0080] Based on the well history data, field exploration data, and downhole operation data of the old gas field, the wellbore integrity evaluation results of the old gas field are determined;

[0081] Based on the gas reservoir characteristics, drilling and completion technology, and gas production technology of old gas fields, determine the main controlling factors of low-production or shut-down wells in old gas fields;

[0082] Based on the distribution pattern of residual gas in the gas reservoir of the old gas field, the evaluation results of the integrity of the old wells in the old gas field, and the main controlling factors of low-production or shut-down wells in the old gas field, the evaluation results of the potential tapping of old wells in the old gas field are determined:

[0083] The evaluation results of the potential tapping of old well measures in old gas fields are determined using the following formula:

[0084] P2 = P S2 ×P C2 ×P J ×P G ×P Y

[0085] In the formula: P2 represents the evaluation result of the potential tapping of old well measures in old gas fields; P S2 Indicates the reserve condition parameters of old wells; P C2 Indicates reservoir condition parameters of old wells; P J P represents the parameters indicating the evaluation results of the integrity of old wellbore in an old gas field. G This represents the key controlling factor parameter for low-production or shut-down wells in old gas fields; P Y This represents the process condition parameters for tapping potential; where P S P C P Y Determined based on the distribution pattern of residual gas in the gas reservoirs of old gas fields.

[0086] The different parameters in the above formula are obtained by dividing the sum of the scores of the influencing factors corresponding to the parameters by the number of influencing factors. The influencing factors are preset before calculation.

[0087] Based on the geological characteristics of the gas reservoirs in the old gas field, determine the technological data for tapping the potential of old wells in the old gas field, and make targeted improvements to the existing technology according to the needs of tapping the potential of old wells to meet the requirements of tapping the potential.

[0088] Based on the evaluation results of the potential tapping of old wells in old gas fields and the technical data of the potential tapping of old wells in old gas fields, the potential tapping well locations of old gas fields are determined according to the tapping of potential tapping measures such as well repair, perforation repair, water shut-off, profile adjustment, drainage and gas production, replenishment of formation energy, adjustment of production operation system, reservoir stimulation, sidetracking, new well densification, and edge expansion.

[0089] Economic and risk predictions are made for potential tapping wells in old gas fields. This includes predicting the cost of tapping potential and the production increase indicators of old wells. Based on single wells, economic benefit statistics are conducted for each well. Based on the economic and risk prediction results and combined with the on-site construction conditions, potential tapping wells in old gas fields are selected and ranked.

[0090] This invention also provides a well selection device for tapping potential in developed old gas fields, as described in the following embodiments. Since the principle behind this device is similar to the well selection method for tapping potential in developed old gas fields, the implementation of this device can be referred to the implementation of the method, and repeated details will not be elaborated further.

[0091] Figure 5 This is a schematic diagram of a well selection device for tapping the potential of old gas fields, as described in an embodiment of the present invention. Figure 5 As shown, the device includes:

[0092] Old Gas Field Selection Module 01 is used to select old gas fields for potential tapping.

[0093] The geological model building module 02 is used to determine the gas reservoir characteristics of the old gas field based on the gas reservoir data, determine the geological features and geological potential tapping direction of the old gas field based on the gas reservoir characteristics, and build the gas reservoir geological model of the old gas field based on the gas reservoir geological features and geological potential tapping direction.

[0094] The distribution pattern determination module 03 is used to determine the distribution pattern of residual gas in the old gas field based on the gas reservoir geological model of the old gas field, through gas reservoir engineering research and historical fitting.

[0095] Integrity evaluation module 04 is used to determine the integrity evaluation results of old wells in old gas fields based on well history data, field exploration data and downhole operation data.

[0096] The main control factor determination module 05 is used to determine the main control factors of low-yield or shut-down wells in old gas fields based on the gas reservoir characteristics, drilling and completion technology and gas production technology.

[0097] The potential tapping evaluation module 06 is used to determine the potential tapping evaluation results of old well measures in old gas fields based on the distribution pattern of residual gas in gas reservoirs, the evaluation results of the integrity of old wells in old gas fields, and the main controlling factors of low-production or shut-down wells in old gas fields.

[0098] The potential tapping technology determination module 07 is used to determine the technical data of potential tapping technology for old wells in old gas fields based on the geological characteristics of the gas reservoirs in old gas fields.

[0099] The well location determination module 08 is used to determine the well locations for tapping potential in old gas fields based on the evaluation results of the tapping potential of old well measures and the technological data of tapping potential of old well measures in old gas fields.

[0100] The Old Gas Field Potential Tapping Well Selection Module 09 is used to perform economic and risk predictions on potential tapping well locations in old gas fields. Based on the economic and risk prediction results, it selects potential tapping wells in old gas fields and sorts the selected wells.

[0101] In one embodiment, the old gas field selection module 01 is specifically used to: select old gas fields with potential for development based on the source rock, reservoir conditions, preservation conditions, trap conditions, supporting conditions, reserve conditions, and development conditions of the old gas field.

[0102] In practice, the old gas fields to be tapped are selected according to the following formula:

[0103] P1 = P T ×P C ×P Q ×P B ×P P ×P S ×P K

[0104] In the formula: P1 represents the evaluation result of tapping the potential of old gas fields; P T Indicates source rock parameters; P C Represents reservoir condition parameters; P Q Indicates the conditional parameters to be saved; P B P represents the trap condition parameter; P Indicates the supporting condition parameters; P S Indicates the reserve condition parameter; P K This represents the development condition parameters.

[0105] The different parameters in the above formula are obtained by dividing the sum of the scores of the influencing factors corresponding to the parameters by the number of influencing factors. The influencing factors are preset before calculation.

[0106] In one embodiment, the gas reservoir data of an old gas field includes:

[0107] Drilling data, logging data, well logging data, coring data, seismic data, dynamic monitoring data, production dynamic data, well history and measures data of old gas fields.

[0108] In one embodiment, the geological model building module 02 is specifically used to: determine the gas reservoir characteristics of the old gas field by analyzing the strata, faults, structures, sedimentary microfacies, reservoirs, gas reservoirs and reserves of the old gas field based on the gas reservoir data of the old gas field.

[0109] In one embodiment, the distribution pattern determination module 03 is specifically used to: based on the gas reservoir geological model of the old gas field, determine the distribution pattern of the remaining gas in the old gas reservoir by analyzing the geological factors, wellbore factors, technological factors, gas reservoir engineering evaluation data, numerical simulation data, well history analysis data, field exploration data, and downhole operation data of the old gas field.

[0110] In one embodiment, the integrity evaluation module 04 is specifically used for: after a long period of production, the wellbore conditions change significantly. It is necessary to determine the integrity evaluation results of the old wellbore in the old gas field based on the well history data, field exploration data and downhole operation data, and determine the conditions for tapping potential construction that the old well can undertake based on the evaluation results.

[0111] In one embodiment, the potential tapping evaluation module 06 is specifically used to: select old wells in old gas fields for potential tapping according to the following formula:

[0112] P2 = P S2 ×P C2 ×P J ×P G ×P Y

[0113] In the formula: P2 represents the evaluation result of the potential tapping of old well measures in old gas fields; P S2 Indicates the reserve condition parameters of old wells; P C2 Indicates reservoir condition parameters of old wells; P J P represents the parameters indicating the evaluation results of the integrity of old wellbore in an old gas field. G This represents the key controlling factor parameter for low-production or shut-down wells in old gas fields; P Y This represents the process condition parameters for tapping potential; where P S P C P Y Determined based on the distribution pattern of residual gas in the gas reservoirs of old gas fields.

[0114] The different parameters in the above formula are obtained by dividing the sum of the scores of the influencing factors corresponding to the parameters by the number of influencing factors. The influencing factors are preset before calculation.

[0115] In one embodiment, the potential tapping process determination module 07 is specifically used to: determine the potential tapping process technology data of old wells in old gas fields based on the geological characteristics of the gas reservoirs in old gas fields, which may include: selecting the optimal potential tapping process technology based on the geological characteristics of old gas fields, and making targeted improvements to the existing process technology according to the needs of potential tapping of old wells to meet the needs of potential tapping.

[0116] In one embodiment, the well location determination module 08 is specifically used to: determine the well locations for tapping potential in old gas fields based on the evaluation results of the tapping potential of old well measures and the technological data of tapping potential of old well measures in old gas fields, according to well repair, perforation repair, water shut-off, profile adjustment, drainage and gas production, replenishment of formation energy, adjustment of production work system, reservoir stimulation, sidetracking, new well densification, and edge expansion measures.

[0117] In one embodiment, the old gas field potential tapping well selection module 09 is specifically used for: making economic and risk predictions for the potential tapping well locations in the old gas field, which may include: predicting the potential tapping cost and production increase indicators of the old wells, conducting single-well economic benefit assessment based on a single well, selecting the old gas field potential tapping wells in combination with the on-site construction conditions, and ranking the selected old wells.

[0118] In this embodiment of the invention, a method for selecting wells for potential tapping in old gas fields has been developed. The method involves selecting old gas fields for potential tapping; determining the reservoir characteristics of the old gas field based on its reservoir data; determining the reservoir geological features and potential tapping direction based on these features; establishing a reservoir geological model based on these features; determining the remaining gas distribution pattern based on the reservoir geological model through reservoir engineering research and historical data fitting; determining the wellbore integrity evaluation results based on the well history data, field exploration data, and downhole operation data of the old gas field; and finally, determining the reservoir characteristics, drilling and completion techniques, and gas production techniques based on the gas field's gas reservoir features. The process involves: identifying the main controlling factors for low-production or shut-down wells in old gas fields; determining the evaluation results of the potential for tapping old wells based on the distribution patterns of residual gas in the old gas field reservoirs, the evaluation results of the integrity of old wells, and the main controlling factors for low-production or shut-down wells; determining the technological data for tapping old wells based on the geological characteristics of the old gas field reservoirs; determining the locations of tapping wells based on the evaluation results of the potential for tapping old wells and the technological data for tapping old wells; conducting economic and risk predictions for the locations of tapping wells in the old gas field; selecting tapping wells based on the economic and risk prediction results; and ranking the selected old wells.

[0119] Compared with existing technologies where research on well selection methods for tapping potential in old gas fields is relatively weak, resulting in poor tapping effects and low economic benefits, this approach can accurately evaluate the tapping potential of old gas fields and improve the effectiveness and economic benefits of tapping potential in old gas fields.

[0120] In summary, the embodiments of this invention comprehensively evaluate the potential of old wells, forming a unified well selection method for tapping the potential of developed old gas fields. This method greatly improves the effectiveness and economic benefits of tapping the potential of old gas fields, reduces the risks of tapping the potential, and has significant market demand and broad application prospects.

[0121] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-mentioned method for tapping potential and selecting wells in developed old gas fields.

[0122] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for tapping potential and selecting wells in developed old gas fields.

[0123] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-mentioned method for tapping potential and selecting wells in developed old gas fields.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0125] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0126] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0127] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0128] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0129] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for tapping the potential of existing gas fields, characterized in that, include: Selected old gas fields for potential tapping; Based on the gas reservoir data of the old gas field, determine the gas reservoir characteristics of the old gas field, determine the gas reservoir geological features and geological potential tapping direction of the old gas field based on the gas reservoir characteristics of the old gas field, and establish the gas reservoir geological model of the old gas field based on the gas reservoir geological features and geological potential tapping direction. Based on the geological model of the gas reservoir in the old gas field, the distribution pattern of the remaining gas in the gas reservoir of the old gas field is determined through gas reservoir engineering research and historical fitting. Based on the well history data, field exploration data, and downhole operation data of the old gas field, the wellbore integrity evaluation results of the old gas field are determined; Based on the gas reservoir characteristics, drilling and completion technology, and gas production technology of old gas fields, determine the main controlling factors of low-production or shut-down wells in old gas fields; Based on the distribution pattern of residual gas in the gas reservoir of the old gas field, the evaluation results of the integrity of the old wells in the old gas field, and the main controlling factors of low-production or shut-down wells in the old gas field, the evaluation results of the potential tapping of old well measures in the old gas field are determined. Based on the geological characteristics of the gas reservoirs in old gas fields, determine the technological data for tapping the potential of old wells in old gas fields; Based on the evaluation results of the potential tapping of old wells in old gas fields and the technical data of the potential tapping of old wells in old gas fields, the locations of potential tapping wells in old gas fields are determined. Economic and risk predictions were made for potential well locations in old gas fields. Based on the results of the economic and risk predictions, potential well locations for potential tapping in old gas fields were selected, and the selected old wells were ranked.

2. The method as described in claim 1, characterized in that, Selected old gas fields for potential tapping include: Based on the source rocks, reservoir conditions, preservation conditions, trap conditions, supporting facilities, reserves, and development conditions of the old gas fields, potential old gas fields for further development are selected.

3. The method as described in claim 2, characterized in that, Based on the source rock, reservoir conditions, preservation conditions, trap conditions, supporting facilities, reserve conditions, and development conditions of the old gas field, the following formula is used to select old gas fields with potential for development: P1=P T ×P C ×P Q ×P B ×P P ×P S ×P K In the formula: P1 represents the evaluation result of tapping the potential of old gas fields; P T Indicates source rock parameters; P C Represents reservoir condition parameters; P Q Indicates the conditional parameters to be saved; P B P represents the trap condition parameter; P Indicates the supporting condition parameters; P S Indicates the reserve condition parameter; P K This represents the development condition parameters.

4. The method as described in claim 1, characterized in that, Gas reservoir data from old gas fields include: Drilling data, logging data, well logging data, coring data, seismic data, dynamic monitoring data, production dynamic data, well history and measures data of old gas fields.

5. The method as described in claim 1, characterized in that, Determining the reservoir characteristics of old gas fields based on reservoir data includes: Based on the gas reservoir data of the old gas field, the gas reservoir characteristics of the old gas field are determined by analyzing the strata, faults, structures, sedimentary microfacies, reservoirs, gas reservoirs and reserves.

6. The method as described in claim 1, characterized in that, Based on the geological model of the gas reservoir in the old gas field, the distribution pattern of residual gas in the gas reservoir of the old gas field is determined through gas reservoir engineering research and historical fitting, including: Based on the geological model of the gas reservoir in the old gas field, the distribution pattern of residual gas in the gas reservoir of the old gas field is determined by analyzing geological factors, wellbore factors, technological factors, gas reservoir engineering evaluation data, numerical simulation data, well history analysis data, field exploration data, and downhole operation data.

7. The method as described in claim 1, characterized in that, The following formula is used to determine the evaluation results of the potential tapping of old wells in old gas fields, based on the distribution pattern of residual gas in the gas reservoirs, the evaluation results of the integrity of old wells in old gas fields, and the main controlling factors of low-production or shut-down wells in old gas fields: P2=P S2 ×P C2 ×P J ×P G ×P Y In the formula: P2 represents the evaluation result of the potential tapping of old well measures in old gas fields; P S2 Indicates the reserve condition parameters of old wells; P C2 Indicates reservoir condition parameters of old wells; P J P represents the parameters indicating the evaluation results of the integrity of old wellbore in an old gas field. G This represents the key controlling factor parameter for low-production or shut-down wells in old gas fields; P Y This represents the process condition parameters for tapping potential; where P S P C P Y Determined based on the distribution pattern of residual gas in the gas reservoirs of old gas fields.

8. The method as described in claim 1, characterized in that, Based on the evaluation results of the potential tapping of old wells in the old gas field and the technological data of the potential tapping of old wells in the old gas field, the locations of potential tapping wells in the old gas field are determined, including: Based on the evaluation results of the potential tapping of old well measures in old gas fields and the technical data of old well measures tapping of old gas fields, the potential tapping well locations of old gas fields are determined according to the tapping of potential measures such as well repair, perforation repair, water shut-off, profile adjustment, drainage and gas production, replenishment of formation energy, adjustment of production operation system, reservoir stimulation, sidetracking, new well densification, and edge expansion.

9. A well selection device for tapping the potential of an existing gas field, characterized in that, include: The old gas field selection module is used to select old gas fields with potential for further development. The geological model building module is used to determine the gas reservoir characteristics of old gas fields based on the gas reservoir data, determine the geological features and geological potential tapping directions of old gas fields based on the gas reservoir characteristics, and build a geological model of old gas fields based on the gas reservoir geological features and geological potential tapping directions. The distribution pattern determination module is used to determine the distribution pattern of residual gas in old gas fields based on the gas reservoir geological model of old gas fields, through gas reservoir engineering research and historical fitting. The integrity assessment module is used to determine the integrity assessment results of old wells in old gas fields based on well history data, field exploration data, and downhole operation data. The main control factor determination module is used to determine the main control factors of low-production or shut-down wells in old gas fields based on the reservoir characteristics, drilling and completion technology and gas production technology of old gas fields. The potential tapping evaluation module is used to determine the potential tapping evaluation results of old well measures in old gas fields based on the distribution pattern of residual gas in gas reservoirs, the evaluation results of the integrity of old wells in old gas fields, and the main controlling factors of low-production or shut-down wells in old gas fields. The potential tapping technology determination module is used to determine the technical data of potential tapping technology for old wells in old gas fields based on the geological characteristics of the gas reservoirs. The well location determination module is used to determine the well locations for tapping potential in old gas fields based on the evaluation results of the tapping potential of old well measures and the technological data of tapping potential of old well measures in old gas fields. The old gas field potential tapping well selection module is used to perform economic and risk predictions on potential tapping well locations in old gas fields. Based on the economic and risk prediction results, it selects potential tapping wells in old gas fields and sorts the selected wells.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of any one of claims 1 to 8.

12. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 8.

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