A method for developing condensate gas reservoir

Abstract

The present invention discloses a method for developing a condensate gas reservoir. The method comprises: adopting a development method adapted to different production stages of the condensate gas reservoir, carrying out exhaustion development in the early stage of the condensate gas reservoir development until the condensate gas reservoir reaches the set exhaustion development lower limit; switching to air injection development, selecting at least one production well from the condensate gas reservoir according to a set rule, changing the selected production well into an air injection well, and injecting a catalyst and a combustion aid into the air injection well; determining the air injection rate according to the effective oil layer parameters of the condensate gas reservoir, and injecting air into the air injection well according to the determined air injection rate. The condensate gas reservoir can be effectively developed in the full cycle development process, thereby improving the development efficiency and recovery rate.

Description

Technical Field

[0001] The invention relates to the technical field of unconventional oil and gas reservoir development, and in particular to a condensate gas reservoir development method. Background Art

[0002] Condensate gas reservoirs mainly refer to gas reservoirs where natural gas and condensate oil are in a single gas phase under formation conditions and conform to the law of retrograde condensation, also known as reverse condensation, within a certain pressure range. Condensate gas reservoirs occupy an important position in the development of oil and gas reservoirs in my country, and their development has been highly valued by the petroleum industry. Condensate gas reservoirs are extremely special and complex. On the one hand, they have important economic value because they can produce natural gas and condensate oil at the same time; on the other hand, during the development process, retrograde condensation will occur due to the reduction of formation pressure, thus affecting the final recovery rate of the gas reservoir.

[0003] At present, there are two main development methods for condensate gas reservoirs: depletion or cyclic gas injection. Summary of the invention

[0004] The inventors found that the cyclic gas injection development of condensate gas reservoirs in the prior art has high requirements for geological conditions and capital investment. In addition, due to the low viscosity of the gas, severe fingering often occurs during the gas drive process, resulting in premature breakthrough of the gas in the production well, reducing the sweep efficiency. Due to differences in the injection and production well spacing and reservoir physical properties of each single well, the gas channeling time of each gas production well is also different. At the same time, the actual operation difficulties and excessive economic pressure make it difficult to promote the implementation of the cyclic gas injection method. Only a few condensate gas reservoirs in my country use this method. The depletion development method has low investment costs and does not require a high degree of geological knowledge. It is still the main development method in my country. However, as time goes by, when the formation pressure drops below the dew point pressure, the depletion development method will inevitably cause retrograde condensation, that is, retrograde condensate is precipitated from the formation. Once the retrograde condensate is precipitated from the formation, it is difficult to flow and is easy to remain in the reservoir, causing the loss of condensate oil; at the same time, due to the blockage of retrograde condensate oil, the gas well production capacity continues to decrease.

[0005] At present, there is still no effective solution to the development status of condensate gas reservoirs and the main contradictions they face.

[0006] In order to at least partially solve the technical problems existing in the prior art, the inventors have made the present invention, and through a specific implementation method, provide a condensate gas reservoir development method, which can effectively develop the condensate gas reservoir during the full cycle development process, thereby improving the development efficiency and recovery rate.

[0007] An embodiment of the present invention provides a condensate gas reservoir development method, comprising:

[0008] Performing exhaustion development on the condensate gas reservoir until the condensate gas reservoir reaches a set exhaustion development lower limit;

[0009] Selecting at least one production well from the condensate gas reservoir according to a set rule, changing the selected production well into an air injection well, and injecting a catalyst and a combustion aid into the air injection well;

[0010] The air injection rate is determined according to the effective oil layer parameters of the condensate gas reservoir, and air is injected into the air injection well according to the determined air injection rate.

[0011] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0012] (1) The condensate gas reservoir development method provided in the embodiment of the present invention adopts a development method adapted to different production stages of the condensate oil and gas reservoir. In the early stage of the development of the condensate gas reservoir, the depletion development method is used for production. After the formation pressure gradually decreases to the dew point pressure, the condensate oil is precipitated from the gas phase, resulting in a gradual increase in the retrograde condensate oil in the formation, until it is determined that the condensate gas reservoir has reached the set depletion development lower limit, that is, when the depletion development is difficult to be implemented economically and effectively, it is converted to air injection development; the selected production well is changed to an air injection well, and a catalyst and a combustion-supporting agent are injected into the air injection well. After the agent is added, air is continuously injected into the air injection well according to the determined air injection volume, so that a small amount of retrograde condensate in the formation is used as fuel to form combustion with the continuously injected air, thus solving the blockage problem of retrograde condensate; at the same time, the retrograde condensate used as fuel only accounts for a small proportion, and most of the remaining retrograde condensate that blocks the wellbore can be produced, reducing the loss of retrograde condensate to a minimum, with significant economic benefits; at the same time, a high-temperature and high-pressure hot distillation miscible displacement zone of crude oil, light hydrocarbon gas, and flue gas is formed, forming a high-pressure air injection "hot miscible displacement" to achieve continuous and efficient development.

[0013] (2) Due to the unique thermal front and oil wall effect of air injection development, the sufficient energy and flue gas provided by combustion create conditions for the flow of crude oil between wells. A large amount of crude oil will be produced from the production wells, ultimately achieving a high recovery rate under full life cycle conditions.

[0014] (3) Condensate gas reservoirs are often buried deep. During the air injection development stage, there is a great risk of electric ignition due to the long pipe string. The condensate gas reservoir development method provided in the embodiment of the present invention fully utilizes the abnormally high temperature and high pressure characteristics of the condensate gas reservoir to design a new combustion aid + catalyst chemical ignition method. Laboratory verification shows that the combustion aid + catalyst releases heat after combining with air under high pressure conditions, and the starting temperature is reduced to about 70°C, which can achieve spontaneous combustion at the oil layer temperature, avoid the risk of the electric ignition process, and improve the ignition success rate.

[0015] (4) High production sustainability and considerable economic benefits. In the early stage, conventional exhaustion development and self-flowing production are adopted for condensate gas reservoirs with low investment. Until the condensate gas reservoir reaches the set exhaustion development lower limit, the natural gas recovery rate is generally less than 40%, and the condensate oil recovery rate is less than 25%. Most of the remaining reserves cannot be effectively utilized. After that, if the existing technology is used to adopt cyclic gas injection, CO 2 Or water injection development, which has high requirements on geological conditions. During the development process, the formation pressure needs to be kept above the dew point pressure, and the elastic energy of the reservoir itself cannot be fully utilized. These methods can maintain pressure development in theory, but due to the actual operation difficulties and excessive economic pressure caused by gas sources, such methods are difficult to promote and apply. The condensate gas reservoir development method provided by the embodiment of the present invention fully utilizes the reservoir's own properties in the early stage, exhaustion development, low investment and good effect; in the late stage of exhaustion exploitation, air injection development is adopted to take over production. The air resources are abundant and no additional gas sources need to be purchased. At the same time, air injection development of oil reservoirs has wide adaptability and is relatively less affected by geological conditions; the present invention further improves the sustainability of condensate oil and gas reservoir development, compresses the initial investment, and has considerable economic benefits.

[0016] (5) The condensate gas reservoir development method provided in the embodiment of the present invention is applicable to condensate gas reservoirs at different burial depths and pressure conditions. It has no clear technical limits on the scope of use and is easy to promote and use.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a flow chart of a condensate gas reservoir development method in Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the well pattern layout in the first embodiment of the present invention. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0022] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0023] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0024] In the description of the present invention, it should be noted that the terms "include", "including", "have", "contain" and the like are open terms, meaning including but not limited to.

[0025] In order to solve the problem that there is no effective development solution for condensate gas reservoirs in the prior art, an embodiment of the present invention provides a condensate gas reservoir development method, which can effectively develop condensate gas reservoirs during the full cycle development process, thereby improving development efficiency and recovery rate.

[0026] The full-cycle exploitation method starts with the discovery and development of condensate gas reservoirs and ends when the economic benefits of oil field development reach zero. Development policies are designed for different production stages to ensure efficient development of the reservoir throughout its life cycle.

[0027] Embodiment 1

[0028] Embodiment 1 of the present invention provides a condensate gas reservoir development method, the process of which is as follows: Figure 1 As shown, the following steps are included:

[0029] Step S11: Perform depletion development on the condensate gas reservoir until the condensate gas reservoir reaches the set depletion development lower limit.

[0030] Specifically, the above-mentioned condensate gas reservoirs include clastic rock condensate gas reservoirs, carbonate condensate gas reservoirs, etc.; the condensate oil content is greater than 200g / m 3 Condensate gas reservoirs may contain edge and bottom water or may not contain edge and bottom water.

[0031] That is, the range of condensate gas reservoirs applicable to the development method of the embodiment of the present invention is wide, as long as the condensate oil content is greater than 200g / m 3, condensate content greater than 200g / m 3 Only in this way can the oil saturation be guaranteed to be between 15% and 20%; otherwise, insufficient fuel generation or discontinuous combustion may occur during air injection development.

[0032] In the early stage of development, the depletion development method is adopted, and the formation succession method is adopted to stabilize production. The production wells of the structural condensate gas reservoir can be arranged along the structural direction, with a well spacing of 500m to 800m, and the production wells and formation pressure are continuously monitored.

[0033] As the depletion development process continues to advance, the formation pressure continues to decrease, the production pressure difference between the wellhead and the bottom of the well gradually becomes smaller, the gas production decreases, the condensate oil content gradually increases, and the depletion development is carried out until the condensate gas reservoir reaches the set depletion development lower limit.

[0034] In some optional embodiments, determining that the condensate gas reservoir has reached a set depletion development lower limit may specifically include:

[0035] Determine that the formation pressure of the target layer of the condensate gas reservoir meets the abandonment pressure condition; and / or determine that the production of the condensate gas reservoir meets the abandonment production condition.

[0036] Step S12: Select at least one production well from the condensate gas reservoir according to the set rules, and change the selected production well into an air injection well.

[0037] In some optional embodiments, at least one production well may be selected from the production wells in the condensate gas reservoir according to the type of the condensate gas reservoir and the production well layout information.

[0038] Further, if the condensate gas reservoir is a structural condensate gas reservoir, and the production wells of the condensate gas reservoir are arranged in a linear well pattern, at least one production well at the highest structural point is selected from the production wells of the condensate gas reservoir;

[0039] If the condensate gas reservoir is a lithologic condensate gas reservoir, and the production wells of the condensate gas reservoir are arranged in a mesh well pattern, at least one production well located in the center of the mesh well pattern is selected from the production wells of the condensate gas reservoir.

[0040] Reference Figure 2 As shown in the figure, it is a schematic diagram of the well network in the structural condensate gas reservoir. A linear well network is selected, and the wells are arranged in a single line along the structural direction. There are 4 production wells in total, and the designed well spacing is 500m to 800m; when entering the air injection development stage, the production wells at the highest point of the structure are selected as air injection wells; the spacing between gas injection wells is 500 to 800m, and the control range of a single well is 3 to 4 production well rows, 1.5km to 2km.

[0041] The selected production wells will be changed to air injection wells. The air injection wells need to be equipped with wellheads with a pressure resistance of 70MPa or above. The production wells will continue to use the original production wells and need to be equipped with oil production wellheads with a pressure resistance of 70Mpa or above.

[0042] Step S13: injecting catalyst and combustion aid into the air injection well.

[0043] In some optional embodiments, the amount of retrograde condensate oil is determined according to the retrograde condensate range of the air injection well; the catalyst injection amount and the combustion aid injection amount are determined according to the retrograde condensate oil amount; and the catalyst and the combustion aid are injected into the air injection well according to the determined catalyst injection amount and the combustion aid injection amount.

[0044] Furthermore, the determination of the amount of condensate can be divided into the following two cases:

[0045] 1. The lateral distribution range of the retrograde condensation range of the air injection well does not exceed the lateral ignition range.

[0046] When it is judged to be situation 1, the amount of retrograde condensate oil can be directly determined based on the lateral distribution range and longitudinal distribution thickness of the retrograde condensate range.

[0047] Specifically, the lateral ignition range may be a lateral range with the air injection well as the center and a radius of 5 m. The determined amount of retrograde condensate oil may be a volume content.

[0048] Second, the lateral distribution range of the retrograde condensation range of the air injection well exceeds the lateral ignition range.

[0049] When it is judged to belong to the first situation, the amount of retrograde condensate oil is determined according to the lateral distribution range, longitudinal distribution thickness and lateral ignition range of the retrograde condensate range.

[0050] Specifically, the lateral distribution range of the retrograde condensate exceeding the lateral ignition range is discarded, and a new lateral range is determined according to the lateral distribution range of the retrograde condensate range and the lateral ignition range; and then the amount of retrograde condensate oil is determined according to the new lateral range and the longitudinal distribution thickness of the retrograde condensate range.

[0051] In some embodiments, the catalyst injection amount and the combustion aid injection amount can be determined according to the volume ratio of the reverse condensate oil, the catalyst and the combustion aid of 19:19:1 and the amount of the reverse condensate oil, respectively.

[0052] Step S14: determining the air injection rate according to the effective oil layer parameters of the condensate gas reservoir, and injecting air into the air injection well according to the determined air injection rate.

[0053] Specifically, the air injection rate can be optimized according to the effective oil layer thickness. The air injection rate is about 1 to 3×10 4 m 3 / md. The approximate range of the air injection rate can be determined based on the specific effective oil layer thickness, and then the specific value of the air injection rate can be determined based on the specific geological conditions.

[0054] For example, if the effective oil layer thickness is 10 m, the approximate range of air injection rate is 10 to 30 × 104 m 3 / d, and then determine the specific value of the air injection rate based on the specific geological conditions, for example, it can be 20×10 4 m 3 / d.

[0055] Air is injected into the air injection well at a determined air injection rate. After the air injection begins, the high temperature of the formation itself is used to form spontaneous combustion under the action of catalysts and combustion aids. The retrograde condensate in the formation is used as fuel, mixed with oxygen in the air and burned, and then air at normal temperature is continuously injected.

[0056] The condensate gas reservoir development method provided in the first embodiment of the present invention adopts a development method adapted to different production stages of the condensate oil and gas reservoir. In the early stage of the development of the condensate gas reservoir, the depletion development method is used for production. After the formation pressure gradually decreases to the dew point pressure, the condensate oil is precipitated from the gas phase, resulting in a gradual increase in the retrograde condensate oil in the formation, until it is judged that the condensate gas reservoir has reached the set depletion development lower limit, that is, when the depletion development is difficult to implement economically and effectively, it is converted to air injection development; the selected production well is changed to an air injection well, and a catalyst and a combustion aid are injected into the air injection well. Afterwards, air is continuously injected into the air injection well according to the determined air injection volume, so that a small amount of retrograde condensate in the formation is used as fuel to form combustion with the continuously injected air, thus solving the blockage problem of retrograde condensate; at the same time, the retrograde condensate used as fuel only accounts for a small proportion, and most of the remaining retrograde condensate that blocks the wellbore can be produced, so that the loss of retrograde condensate is reduced to a minimum, with significant economic benefits; at the same time, a high-temperature and high-pressure hot distillation miscible displacement zone of crude oil, light hydrocarbon gas, and flue gas is formed, forming a high-pressure air injection "hot miscible drive" to achieve continuous and efficient development.

[0057] Due to the unique thermal front and oil wall effect of air injection development, sufficient energy and flue gas provided by combustion create conditions for the flow of crude oil between wells. A large amount of crude oil will be produced from the production wells, ultimately achieving a high recovery rate under full life cycle conditions.

[0058] Condensate gas reservoirs are often buried deep. During the air injection development stage, there is a great risk of electric ignition due to the long tubing. The condensate gas reservoir development method provided in Example 1 of the present invention fully utilizes the abnormally high temperature and high pressure characteristics of condensate gas reservoirs to design a new combustion aid + catalyst chemical ignition method. Laboratory verification shows that the combustion aid + catalyst releases heat after combining with air under high pressure conditions, and the starting temperature is reduced to about 70°C, which can achieve spontaneous combustion at the oil layer temperature, avoid the risk of the electric ignition process, and improve the ignition success rate.

[0059] High production sustainability and considerable economic benefits. In the early stage, conventional exhaustion development and self-flowing production are adopted for condensate gas reservoirs with low investment until the condensate gas reservoir reaches the set exhaustion development lower limit. Generally, the natural gas recovery rate is less than 40%, and the condensate oil recovery rate is less than 25%. Most of the remaining reserves cannot be effectively used. After that, if the existing technology is used to adopt cyclic gas injection, CO 2 Or water injection development, which has high requirements on geological conditions. During the development process, the formation pressure needs to be kept above the dew point pressure, and the elastic energy of the reservoir itself cannot be fully utilized. These methods can maintain pressure development in theory, but due to the actual operation difficulties and excessive economic pressure caused by gas sources, such methods are difficult to promote and apply. The condensate gas reservoir development method provided in Example 1 of the present invention fully utilizes the reservoir's own properties in the early stage, exhaustion development, low investment and good effect; in the late stage of exhaustion exploitation, air injection development is adopted to take over production. The air resources are abundant and no additional gas sources need to be purchased. At the same time, air injection development of oil reservoirs has wide adaptability and is relatively less affected by geological conditions; the present invention further improves the sustainability of condensate oil and gas reservoir development, compresses the initial investment, and has considerable economic benefits.

[0060] The condensate gas reservoir development method provided in the first embodiment of the present invention is applicable to condensate gas reservoirs at different burial depths and pressure conditions, has no clear technical limits on the scope of use, and is easy to promote and use.

[0061] During the air injection development process, the gas-liquid ratio changes greatly at different stages. In the early stage, natural gas is mainly produced, and in the later stage, gas and liquid are produced together, and the main outputs are crude oil and flue gas.

[0062] Therefore, it is necessary to monitor the hydrogen sulfide content in the gas produced by the production well. If the hydrogen sulfide content in the gas produced by the production well exceeds the set hydrogen sulfide content threshold, the produced gas is desulfurized.

[0063] During the air injection development process, if any production well reaches the abandonment condition, the production well will be closed; until all production wells in the condensate gas reservoir have been closed, the air injection well will be closed. At this point, the full cycle development process of the condensate gas reservoir is completed.

[0064] In some embodiments, determining that the production well has reached an abandonment condition specifically includes determining that the production well has reached at least one of the following conditions:

[0065] (1) The formation temperature of the target layer of the production well meets the set temperature conditions.

[0066] Specifically, the target layer temperature may reach 300°C.

[0067] (2) The oxygen content in the gas produced by the production well reaches the set oxygen content threshold.

[0068] Specifically, the molar percentage of oxygen in the output gas may be greater than 5%.

[0069] (3) The gas-oil ratio of the production well reaches the set gas-oil ratio threshold.

[0070] Before the production well reaches high temperature and oxygen is seen, it will go through a long period of high gas-oil ratio stage. Considering the pursuit of maximum economic benefits, a gas-oil ratio of 25000m 3 / m 3 As a shut-in indicator for production wells.

[0071] Embodiment 2

[0072] Embodiment 2 of the present invention is a specific application of the condensate gas reservoir development method provided in Embodiment 1. Taking a condensate gas reservoir in Tarim Oilfield as an example, a numerical simulation study is conducted to test the application effect of the full life cycle development method.

[0073] Basic parameters of the reservoir: The reservoir is buried at a depth of 3300m, with a porosity of 12-15%, an oil saturation of 30%, and a gas saturation of 60% (the gas component is mainly CH 4 ), horizontal permeability 20-300mD, thickness of the first oil layer 20m, thickness of the second oil layer 22m, temperature 80℃, initial formation pressure 39.4MPa; wells are arranged along the structure, linear well pattern, gas injection at structural high points, 3 gas injection wells and 22 oil production wells in 4 rows.

[0074] Depletion development stage: self-flowing production, depletion development for 20 years, and production ends when the formation pressure reaches 7-8MPa.

[0075] Air injection development stage: After the exhaustion development production is completed, it will be turned into air injection development, with a single well daily gas injection volume of 25×10 4 m 3 .

[0076] Simulation results:

[0077] (1) The average gas production per well in the depletion development stage is 4-5×10 4 m 3 / d, oil production 2~3m 3 / d; exhaustion development for 6580 days, production ended at formation pressure of 7-8 MPa, natural gas recovery rate of 42%, condensate oil recovery rate of 10.3%;

[0078] (2) The average gas production per well during the air injection development phase is 6-8×10 4 m 3 / d, oil production 2~3m 3 / d; exhaustion development lasted 3390 days, and after the production was completed, the natural gas recovery rate was 45%, and the condensate oil recovery rate was 18.6%;

[0079] (3) Comprehensive calculation of the full life cycle extraction method shows that the cumulative recovery rate of natural gas is 87% and the recovery rate of condensate oil is 28.9%.

[0080] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0081] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0082] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for developing a condensate gas reservoir, characterized in that: include: The condensate gas reservoir is depleted and developed until the condensate gas reservoir reaches the set depletion development lower limit. If the condensate oil content of the condensate gas reservoir is greater than 200g / m 3 , perform the following steps: Selecting at least one production well from the condensate gas reservoir according to a set rule, and changing the selected production well into an air injection well; If the lateral distribution range of the retrograde condensation range of the air injection well does not exceed the lateral ignition range, the amount of retrograde condensate oil is determined according to the lateral distribution range and longitudinal distribution thickness of the retrograde condensation range; if the lateral distribution range of the retrograde condensation range of the air injection well exceeds the lateral ignition range, the amount of retrograde condensate oil is determined according to the lateral distribution range, longitudinal distribution thickness and lateral ignition range of the retrograde condensation range; the lateral ignition range is a lateral range with the air injection well as the center and a radius of 5m; According to the volume ratio of the reverse condensate oil, the catalyst and the combustion aid of 19:19:1 and the amount of the reverse condensate oil, the catalyst injection amount and the combustion aid injection amount are determined respectively, and the catalyst and the combustion aid are injected into the air injection well according to the determined catalyst injection amount and the combustion aid injection amount; Determining an air injection rate according to the effective oil layer parameters of the condensate gas reservoir, and injecting air into the air injection well according to the determined air injection rate; If any production well reaches abandonment conditions, shut down the production well; Until all production wells of the condensate gas reservoir are closed, the air injection well is closed.

2. The method according to claim 1, characterized in that Determining that the condensate gas reservoir has reached the set depletion development lower limit specifically includes: Determining that the formation pressure of the target layer of the condensate gas reservoir meets the abandonment pressure condition; and / or, Determine that the production of the condensate gas reservoir meets the abandoned production conditions.

3. The method according to claim 1, characterized in that The selecting at least one production well from the condensate gas reservoir according to the set rule specifically includes: At least one production well is selected from the production wells of the condensate gas reservoir according to the type of the condensate gas reservoir and the production well layout information.

4. The method according to claim 3, characterized in that The selecting at least one production well from the condensate gas reservoir according to the type of the condensate gas reservoir and the production well layout information specifically includes: If the condensate gas reservoir is a structural condensate gas reservoir, and the production wells of the condensate gas reservoir are arranged in a linear well pattern, at least one production well at the highest structural point is selected from the production wells of the condensate gas reservoir; If the condensate gas reservoir is a lithologic condensate gas reservoir, and the production wells of the condensate gas reservoir are arranged in a mesh well pattern, at least one production well located at the center of the mesh well pattern is selected from the production wells of the condensate gas reservoir.

5. The method according to claim 1, characterized in that Determining that a production well meets abandonment conditions includes determining that the production well meets at least one of the following conditions: The formation temperature of the target layer of the production well meets the set temperature condition; The oxygen content in the gas produced by the production well reaches the set oxygen content threshold; The gas-oil ratio of the production well reaches the set gas-oil ratio threshold.

6. The method according to any one of claims 1 to 5, characterized in that: Also includes: If the hydrogen sulfide content in the produced gas from the production well exceeds the set hydrogen sulfide content threshold, the produced gas is desulfurized.

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