Balanced gas injection method and device for air injection deep profile control

Abstract

This application provides a method and apparatus for balanced gas injection for depth profile control. The method includes: controlling the balanced gas injection system to inject steam into the injection well to raise the temperature of the wellbore and high-permeability zones of the production well; when the wellbore temperature exceeds a preset temperature value, controlling the balanced gas injection system to stop injecting steam and injecting an oil-phase medium into the injection well to seal the high-permeability zones; controlling the balanced gas injection system to repeatedly inject steam and oil-phase medium according to the wellhead pressure of the injection well to form a slug; controlling the balanced gas injection system to inject hot foam liquid into the injection well to displace the oil-phase medium into the formation; controlling the injection well to close and perform a well-shutting operation to reduce the formation temperature and optimize the sealing effect of the oil-phase medium; and controlling the balanced gas injection system to continuously inject air into the injection well. This application achieves uniform gas diffusion and efficient expansion of oxidation reaction, significantly improving the recovery rate and development safety of low-permeability reservoirs.

Description

Technical Field

[0001] This application relates to the field of air injection development technology, and in particular to a balanced air injection method and apparatus for adjusting air injection depth profile. Background Technology

[0002] In the field of oil extraction, low-permeability and ultra-low-permeability oilfields currently rely mainly on water injection development. However, as water injection development progresses into its later stages, numerous drawbacks gradually emerge. On the one hand, single-well production shows a significant decline, with a faster rate of production deceleration and a sharp increase in water cut, which greatly restricts the oilfield's extraction efficiency and economic benefits. On the other hand, the remediation work after well water flooding is extremely difficult, and the high price of profile control agents on the market further increases the cost burden of extraction. Compared to conventional medium-to-high permeability reservoirs, low-permeability to ultra-low-permeability reservoirs have extremely low reservoir permeability, not only small pore throats but also extremely complex structures with strong heterogeneity, and widespread microfractures. These geological characteristics make it difficult for conventional extraction methods to achieve ideal results in these reservoirs.

[0003] Air injection, as a tertiary oil recovery technology, has been field-tested and promoted in low-permeability and heavy oil reservoirs in recent years, achieving certain results. However, in the process of air injection development, the dominant waterflooding pathway has had a significant negative impact on the development effect. In low-permeability reservoirs, after waterflooding, the reservoir formation is partially flooded, with significant differences in vertical sweep, and a large amount of remaining oil cannot be effectively displaced and recovered. If gas injection is used to further improve the recovery rate at this point, the indiscriminately injected gas often seeps along high-permeability channels, bypassing undeveloped medium- to low-permeability reservoirs, leading to a series of new problems such as localized oxidation front propagation, uneven temperature field distribution, and high gas-liquid ratio lift, severely hindering the improvement of air injection development effectiveness.

[0004] Currently, commonly used profile control techniques mainly cover three categories: mechanical profile control, chemical profile control, and physical profile control.

[0005] 1. Mechanical profile control: This method modifies the well tubing to reduce water content and increase production. It is simple to operate, relatively inexpensive, and has a relatively high success rate. However, mechanical profile control is limited by factors such as well conditions, interlayer conditions, and application conditions, and its effectiveness is limited to the near-wellbore area, failing to effectively improve the heterogeneity of deeper formations.

[0006] 2. High-Temperature Resistant Inorganic Gel Profile Modifier (Chemical Profile Modifier): This type of profile modifier is formulated from inorganic gelling agents, activators, retarders, dispersants, etc., in appropriate proportions. Under normal temperature and pressure, its main components are chemically inert. By precisely controlling the temperature and the amount of inorganic / organic composite activator, the gelation rate and the strength after gelation can be adjusted. Typically, before gelation, its viscosity is low, facilitating pumping. After gelation in the formation, it exhibits high strength and good temperature resistance, meeting the heat resistance and high-temperature steam scouring requirements under steam drive conditions (150-200℃) and maintaining long-term effectiveness. However, this type of profile modifier is relatively expensive, and its heat resistance and high-temperature scouring performance cannot meet the requirements for the 450℃ temperature conditions at the air injection oxidation front of thin oil, making it unsuitable for air injection development profile modification.

[0007] 3. Oily Sludge Profile Modification (Physical Profile Modification): Most oily sludge consists of water, oil, solid residues, and asphaltene, among which oily sludge particles are difficult to separate from the aqueous phase. Its profile modification mechanism mainly includes physical blockage by sludge particles, selective blocking, and re-migration and re-blocking mechanisms. In practical applications, oily sludge undergoes phase separation in porous media, with the solid and oil phases remaining in the pores to block the formation. However, this method requires the solid phase particles of the oily sludge to match the porosity of the formation being blocked, and it can only use oily sludge produced locally for reinjection. The availability and application range of the injection medium are extremely limited, making large-scale industrial application difficult.

[0008] 4. Salting-out Profile Control (Physical Profile Control): Salting-out, also known as ethanol "salting-out," involves sequentially injecting an electrolyte solution and a non-electrolyte into the formation. The competition between the non-electrolyte and the electrolyte reduces the solubility of the electrolyte in water, causing it to precipitate and form solid particles, thus blocking the formation. Non-electrolytes can be alcohols or acids, such as methanol, ethanol, and propanol; electrolytes can be potassium salts, sodium salts, and calcium salts. This method effectively improves the macroscopic sweep area and also has a significant effect on the microscopic sweep area. However, it is not suitable for gas-driven operations because the blockage formed by the solid particles cannot stop the propulsion of the injected gas.

[0009] In summary, current profile control methods generally suffer from high costs, limited profile control capabilities, and poor economic efficiency. Furthermore, the high temperatures generated during air injection can affect the stability of chemical agents, damaging the profile control mechanism and significantly reducing its effectiveness. Therefore, there is an urgent need to develop a new profile control method to reduce the cost of profile control measures, improve the sweep efficiency of heterogeneous oil-water distribution reservoirs after waterflooding, and enhance overall development results. Summary of the Invention

[0010] To address the problems in the prior art, this application provides a balanced air injection method and apparatus for adjusting air injection depth profile, which can solve the problems existing in the prior art.

[0011] In a first aspect, this application provides a method for balanced gas injection with air injection depth profile adjustment, comprising:

[0012] A balanced gas injection system that controls the depth of air injection profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strips of the production well;

[0013] When the temperature of the wellbore exceeds the preset temperature value, the equalization gas injection system is controlled to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip;

[0014] The equalization gas injection system is controlled to repeatedly inject steam and oil phase medium into the gas injection well to form a slug, based on the wellhead pressure of the gas injection well.

[0015] The balanced gas injection system is controlled to inject hot foam fluid into the gas injection well to displace the oil phase medium into the formation.

[0016] The gas injection well is shut down and a well-steaming operation is performed to reduce the formation temperature and optimize the sealing effect of the oil phase medium.

[0017] The equalization gas injection system is controlled to continuously inject air into the injection well.

[0018] Further, the step of controlling the equalization injection system to repeatedly inject steam and oil phase media into the injection well to form a slug based on the wellhead pressure of the injection well includes:

[0019] The equalization gas injection system is controlled to inject steam into the injection well;

[0020] The balanced gas injection system is controlled to inject oil phase medium into the gas injection well;

[0021] The above operations are performed iteratively until the wellhead pressure of the gas injection well exceeds the preset pressure value.

[0022] Furthermore, before controlling the equalization gas injection system to continuously inject air into the injection well, the method further includes:

[0023] The balanced gas injection system is controlled to inject catalytic oxygen-consuming agent into the injection well based on the reservoir thickness.

[0024] Furthermore, before the balanced gas injection system for controlling the gas injection depth profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strip of the production well, it also includes:

[0025] To obtain the reservoir's permeability, oil saturation, and formation temperature;

[0026] Determine whether the permeability, oil saturation, and formation temperature meet the preset parameter conditions;

[0027] If the permeability, oil saturation, and formation temperature meet the preset parameter conditions, the balanced gas injection system is controlled to perform crude oil saturation treatment on the near-wellbore area of ​​the gas injection well.

[0028] Furthermore, after controlling the equalization gas injection system to continuously inject air into the injection well, the method further includes:

[0029] Real-time monitoring of the pressure change rate of the production well;

[0030] When the rate of pressure change exceeds a preset threshold, the equalization gas injection system is controlled to perform deep profile adjustment to form a dynamic closed region.

[0031] Furthermore, controlling the equalization gas injection system to perform depth profile adjustment to form a dynamically closed region includes:

[0032] Control the shutdown of the production well;

[0033] The equalization gas injection system is controlled to repeatedly inject steam and oil phase media into the production well to seal high-permeability channels, based on the wellhead pressure of the production well.

[0034] Furthermore, the step of controlling the equalization gas injection system to repeatedly inject steam and oil phase media into the production well to block high-permeability channels based on the wellhead pressure of the production well includes:

[0035] The equalization gas injection system is controlled to inject steam into the production well;

[0036] Control the equalization gas injection system to inject oil phase medium into the production well;

[0037] The above operations are performed iteratively until the wellhead pressure of the production well exceeds the preset pressure value.

[0038] Secondly, this application provides a balanced air injection device for adjusting air injection depth profile, comprising:

[0039] The steam injection unit is used to control the equalization gas injection system for gas injection depth profile adjustment to inject steam into the gas injection well to raise the temperature of the wellbore and high-permeability strip of the production well.

[0040] The oil phase medium injection unit is used to control the equalization gas injection system to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip when the temperature of the wellbore exceeds a preset temperature value.

[0041] A slug forming unit is used to control the equalization gas injection system to repeatedly inject steam and oil phase medium into the gas injection well to form a slug based on the wellhead pressure of the gas injection well.

[0042] A hot foam injection unit is used to control the equalization gas injection system to inject hot foam into the gas injection well to displace the oil phase medium into the formation.

[0043] The well-closing unit is used to control the closure of the gas injection well and perform well-closing operations to reduce formation temperature and optimize the sealing effect of oil phase media.

[0044] An air injection unit is used to control the equalization gas injection system to continuously inject air into the gas injection well.

[0045] Furthermore, the slug forming unit includes:

[0046] A steam injection module is used to control the equalization gas injection system to inject steam into the injection well;

[0047] An oil phase medium injection module is used to control the equalization gas injection system to inject oil phase medium into the gas injection well;

[0048] The iterative operation module is used to iteratively execute the above operations until the wellhead pressure of the gas injection well exceeds the preset pressure value.

[0049] Furthermore, it also includes:

[0050] A catalytic oxygen-consuming agent injection unit is used to control the injection of catalytic oxygen-consuming agent into the injection well by the balanced gas injection system according to the reservoir thickness.

[0051] Furthermore, it also includes:

[0052] The parameter acquisition unit is used to acquire reservoir permeability, oil saturation, and formation temperature.

[0053] The condition judgment unit is used to determine whether the permeability, the oil saturation and the formation temperature meet the preset parameter conditions;

[0054] The crude oil saturation treatment unit is used to control the equalization gas injection system to perform crude oil saturation treatment on the near-wellbore area of ​​the gas injection well if the permeability, the oil saturation and the formation temperature meet the preset parameter conditions.

[0055] Furthermore, it also includes:

[0056] The data monitoring unit is used to monitor the rate of pressure change of the production well in real time;

[0057] The depth profile adjustment unit is used to control the equalization gas injection system to perform depth profile adjustment to form a dynamic closed area when the pressure change rate exceeds a preset threshold.

[0058] Furthermore, the depth profile adjustment unit includes:

[0059] A production well shutdown module is used to control the shutdown of the production well;

[0060] The channel plugging module is used to control the equalization gas injection system to repeatedly inject steam and oil phase media into the production well to plug the high-permeability channels based on the wellhead pressure of the production well.

[0061] Furthermore, the channel blocking module includes:

[0062] A steam injection submodule is used to control the equalization gas injection system to inject steam into the production well;

[0063] The oil phase medium injection submodule is used to control the equalization gas injection system to inject oil phase medium into the production well;

[0064] The iterative operation submodule is used to iteratively execute the above operations until the wellhead pressure of the production well exceeds the preset pressure value.

[0065] Thirdly, this application provides a balanced air injection system for adjusting air injection depth profile, used to implement the balanced air injection method for adjusting air injection depth profile as described in any of the above embodiments, including: a steam injection device, an oil phase medium injection device, a hot foam liquid injection device, a catalytic oxygen depleting agent injection device, and an air injection device.

[0066] Fourthly, this application provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the balanced gas injection method for adjusting the air injection depth profile as described in any of the above embodiments.

[0067] Fifthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the equal gas injection method for adjusting air injection depth profile as described in any of the above embodiments.

[0068] Sixthly, this application provides a computer program product, which includes a computer program that, when executed by a processor, implements the balanced gas injection method for adjusting the air injection depth profile as described in any of the above embodiments.

[0069] This application provides a method and apparatus for balanced gas injection for profile control at air injection depth. The method involves controlling a balanced gas injection system to inject steam into the injection well to raise the temperature of the wellbore and high-permeability zones. When the wellbore temperature exceeds a preset value, the balanced gas injection system stops injecting steam and injects an oil-phase medium into the injection well to seal the high-permeability zones. Based on the wellhead pressure of the injection well, the balanced gas injection system is controlled to repeatedly inject steam and an oil-phase medium into the injection well to form a slug. The method further controls the balanced gas injection system... The system injects hot foam fluid into the injection well to displace the oil phase medium into the formation; controls the closure of the injection well and performs a well-steaming operation to reduce the formation temperature and optimize the sealing effect of the oil phase medium; controls the balanced gas injection system to continuously inject air into the injection well, thereby achieving effective suppression of gas channeling and balanced expansion of the gas wave range during the air injection development of low-permeability reservoirs. By dynamically controlling the sealing of high-permeability channels, optimizing oxidation reaction efficiency and pressure balance, the crude oil displacement effect is significantly improved, ultimately greatly increasing the recovery rate and ensuring the safety and economy of the development process.

[0070] Specifically, by controlling the air injection depth and profile adjustment, a balanced gas injection system injects steam into the injection well to raise the temperature of the wellbore and high-permeability zones in the production well, thereby improving the fluidity of the oil phase medium and creating thermal conditions for subsequent plugging. When the temperature of the wellbore exceeds a preset value, the balanced gas injection system stops injecting steam and injects oil phase medium into the injection well to plug the high-permeability zones, thus sealing high-permeability channels, inhibiting gas cross-flow, and improving injection uniformity. Furthermore, by controlling the balanced gas injection system to repeatedly inject steam and oil phase medium into the injection well according to the wellhead pressure, a segment can be formed. The system can seal in layers of areas with different permeability levels, optimize profile control, and control wellhead pressure. By controlling the balanced gas injection system to inject hot foam liquid into the injection well to displace the oil phase medium into the formation, it can ensure unobstructed gas injection channels and reduce the risk of wellbore blockage. By controlling the closure of the injection well and performing a well-steaming operation to reduce formation temperature and optimize the sealing effect of the oil phase medium, it can enhance the sealing stability and prolong the duration of profile control. By controlling the balanced gas injection system to continuously inject air into the injection well, it can evenly inject air to trigger oxidation reactions, expand the thermal sweep volume, and drive efficient recovery of remaining oil.

[0071] Furthermore, the balanced air injection method and device for air injection depth profile adjustment proposed in this application have low cost, strong operability, and are more practical and scalable; at the same time, they can adapt to high temperature and high pressure conditions of air injection to seal high permeability strips; taking into account safety production factors, they can ensure safe and efficient production process. Attached Figure Description

[0072] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0073] Figure 1 This is a schematic flowchart of a balanced gas injection method for adjusting the air injection depth profile according to an embodiment of this application.

[0074] Figure 2 This is a schematic flowchart of a balanced gas injection method for adjusting the air injection depth profile according to an embodiment of this application.

[0075] Figure 3 This is a schematic flowchart of a balanced gas injection method for adjusting the air injection depth profile according to an embodiment of this application.

[0076] Figure 4 This is a schematic flowchart of a balanced gas injection method for adjusting the air injection depth profile according to an embodiment of this application.

[0077] Figure 5 This is a schematic flowchart of a balanced gas injection method for adjusting the air injection depth profile according to an embodiment of this application.

[0078] Figure 6 This is a schematic flowchart of a balanced gas injection method for adjusting the air injection depth profile according to an embodiment of this application.

[0079] Figure 7 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application;

[0080] Figure 8 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application;

[0081] Figure 9 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application;

[0082] Figure 10 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application;

[0083] Figure 11 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application;

[0084] Figure 12 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application;

[0085] Figure 13 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application;

[0086] Figure 14 This is a schematic diagram of the system configuration of an electronic device provided in an embodiment of this application;

[0087] Figure 15 This is a schematic diagram of an embodiment of the present application showing the overall profile adjustment and sealing of high-permeability channels before air injection;

[0088] Figure 16 This is a schematic diagram of uniform air injection propulsion provided in an embodiment of this application;

[0089] Figure 17 This is a schematic diagram of air channeling provided in an embodiment of this application;

[0090] Figure 18 This is a schematic diagram of air injection depth profile adjustment provided in an embodiment of this application. Detailed Implementation

[0091] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and their descriptions are used to explain this application, but are not intended to limit this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0092] The following describes the specific implementation process of the balanced gas injection method for adjusting the air injection depth profile provided in this application embodiment, taking the server as the execution subject as an example.

[0093] Figure 1 This is a schematic flowchart of a balanced gas injection method for adjusting air injection depth profile according to an embodiment of this application, as shown below. Figure 1 As shown, the balanced gas injection method for adjusting the air injection depth profile provided in this application includes:

[0094] S101: A balanced gas injection system that controls the depth of air injection profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strip of the production well.

[0095] S102: When the temperature of the wellbore exceeds the preset temperature value, control the equalization gas injection system to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip;

[0096] S103: Control the equalization gas injection system to repeatedly inject steam and oil phase medium into the gas injection well to form a slug based on the wellhead pressure of the gas injection well;

[0097] S104: Control the equalization gas injection system to inject hot foam liquid into the gas injection well to displace the oil phase medium into the formation;

[0098] S105: Control the gas injection well to close and perform a well-clogging operation to reduce formation temperature and optimize the sealing effect of oil phase medium;

[0099] S106: Control the equalization gas injection system to continuously inject air into the gas injection well.

[0100] from Figure 1 As shown in the flowchart, this application provides a balanced gas injection method for depth profile control. The method involves controlling the balanced gas injection system to inject steam into the injection well to raise the temperature of the wellbore and high-permeability zones. When the wellbore temperature exceeds a preset value, the balanced gas injection system stops injecting steam and injects an oil-phase medium into the injection well to seal the high-permeability zones. Based on the wellhead pressure of the injection well, the balanced gas injection system is controlled to repeatedly inject steam and an oil-phase medium into the injection well to form a slug. The balanced gas injection system is then controlled to... The gas injection system injects hot foam fluid into the gas injection well to displace the oil phase medium into the formation; the gas injection well is controlled to be shut down and a well-clogging operation is performed to reduce the formation temperature and optimize the sealing effect of the oil phase medium; the balanced gas injection system is controlled to continuously inject air into the gas injection well, which effectively suppresses gas channeling and balances the gas wave range during the air injection development of low-permeability reservoirs. By dynamically controlling the sealing of high-permeability channels, optimizing oxidation reaction efficiency and pressure balance, the crude oil displacement effect is significantly improved, ultimately greatly increasing the recovery rate and ensuring the safety and economy of the development process.

[0101] Each step is explained in detail below.

[0102] S101: A balanced gas injection system that controls the depth of air injection profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strip of the production well.

[0103] Specifically, before air injection, in order to raise the temperature of the wellbore and high-permeability strips and create flow conditions for the injected oil phase medium, the server controls the balanced gas injection system with air injection depth profile adjustment to inject steam into the injection well. Combined with geological characteristics, dynamic data and connectivity analysis, the production well output is adjusted during the injection process to increase the production well output in the direction of high-permeability strips and promote the migration of injected steam to high-permeability strips.

[0104] In one embodiment, the steam injection rate is 60–100 m / s. 3 / d, the dryness at the bottom of the well is not less than 70%.

[0105] S102: When the temperature of the wellbore exceeds the preset temperature value, control the equalization gas injection system to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip;

[0106] Specifically, the server monitors the temperature of the production wellbore in real time. When the wellbore temperature exceeds the preset temperature value, the steam injection stage ends. After the steam injection is completed, an oil-phase medium is injected to seal the underground high-permeability strips. If the amount of oil-phase medium injected reaches the designed injection volume, the oil-phase medium injection stage ends.

[0107] In one embodiment, the steam injection stage ends when the wellbore temperature exceeds 100°C.

[0108] In one embodiment, the injection rate of the oil phase medium is 30–40 m / s. 3 / d, oil phase medium temperature is 100~120℃, injection volume is 0.0002×l 2 ×hm 3 , where l is the well spacing and h is the formation thickness.

[0109] In one embodiment, the viscosity of the oil phase medium is adjusted according to the formation permeability. When the permeability of the high-permeability strip is 2-6 mD, the viscosity of the oil phase medium is selected as 500-1000 mPa·s; when the permeability of the high-permeability strip is 6-10 mD, the viscosity of the oil phase medium is selected as 1000-3000 mPa·s; and when the permeability of the high-permeability strip is greater than 10 mD, the viscosity of the oil phase medium is selected as 3000-5000 mPa·s.

[0110] S103: Control the equalization gas injection system to repeatedly inject steam and oil phase medium into the gas injection well to form a slug based on the wellhead pressure of the gas injection well;

[0111] Specifically, the oil phase medium injection stage ends when the injected oil phase medium volume reaches the designed injection volume. After the oil phase medium injection stage ends, the server controls the equalization gas injection system to repeatedly inject steam and oil phase medium, forming a slug of steam and oil phase medium underground. This prevents excessive wellhead pressure during depth profile control, optimizes the depth profile control effect, and ensures safe production.

[0112] In one embodiment, such as Figure 15 The diagram shows a schematic of the overall profile adjustment and sealing of high-permeability channels before air injection.

[0113] Figure 2 This is a schematic flowchart of a balanced gas injection method for adjusting air injection depth profile according to an embodiment of this application, as shown below. Figure 2 As shown, S103 includes:

[0114] S201: Control the equalization gas injection system to inject steam into the gas injection well;

[0115] Specifically, after the oil phase medium injection stage is completed, the server controls the equalization gas injection system to repeatedly inject steam and oil phase medium into the injection well to form a slug. First, the equalization gas injection system is controlled to inject steam into the injection well.

[0116] In one embodiment, the steam injection rate is 60–100 m / s. 3 / d, the dryness at the bottom of the well is not less than 70%.

[0117] S202: Control the balanced gas injection system to inject oil phase medium into the gas injection well;

[0118] Specifically, after steam injection is completed, the equalization gas injection system is controlled to inject oil phase medium into the injection well to achieve alternating injection of steam and oil phase medium, thereby forming alternating slugs of steam and oil phase medium.

[0119] In one embodiment, the injection rate of the oil phase medium is 30–40 m / s. 3 / d, oil phase medium temperature is 100~120℃, injection volume is 0.0002×l 2 ×hm 3 , where l is the well spacing and h is the formation thickness.

[0120] In one embodiment, the viscosity of the oil phase medium is adjusted according to the formation permeability. When the permeability of the high-permeability strip is 2-6 mD, the viscosity of the oil phase medium is selected as 500-1000 mPa·s; when the permeability of the high-permeability strip is 6-10 mD, the viscosity of the oil phase medium is selected as 1000-3000 mPa·s; and when the permeability of the high-permeability strip is greater than 10 mD, the viscosity of the oil phase medium is selected as 3000-5000 mPa·s.

[0121] S203: Iteratively execute the above operations until the wellhead pressure of the gas injection well exceeds the preset pressure value.

[0122] Specifically, the server monitors the wellhead pressure of the gas injection well in real time. When the wellhead pressure of the gas injection well exceeds the preset pressure value, the iteration stops. The slug can effectively adjust the profile of the near-wellbore zone.

[0123] In one embodiment, the preset pressure value is 35 MPa. When the wellhead pressure of the gas injection well exceeds 35 MPa, the iteration stops. At this time, the slug can effectively adjust the profile within a range of 10 to 50 m near the well.

[0124] In one embodiment, the injection parameters (including velocity and temperature) need to be dynamically adjusted during the iteration process to ensure that the slugs are evenly distributed and the wellhead pressure is controllable, thereby avoiding the risk of overpressure.

[0125] S104: Control the equalization gas injection system to inject hot foam liquid into the gas injection well to displace the oil phase medium into the formation;

[0126] Specifically, the server-controlled equalization gas injection system injects hot foam fluid into the injection well, displacing the oil phase medium in the wellbore into the formation, ensuring the safety of subsequent air injection. Hot foam displacement removes residual oil phase medium from the wellbore, preventing it from remaining and causing abnormal pressure or wellbore blockage during subsequent air injection. During the air injection phase, the wellbore needs to be kept clean to maintain stable injection pressure; hot foam displacement effectively removes residual medium, reduces the instability of the gas-liquid two-phase flow, and lowers operational risks.

[0127] In one embodiment, the amount of hot foam liquid is (1~1.2)×V m 3 V is the wellbore volume, ensuring complete displacement of residual oil phase media in the wellbore to prevent abnormal pressure or safety hazards caused by residue blockage during air injection.

[0128] S105: Control the gas injection well to close and perform a well-clogging operation to reduce formation temperature and optimize the sealing effect of oil phase medium;

[0129] Specifically, after completing the above steps, the gas injection well is shut in and a well-steaming operation is performed to reduce the formation temperature, reduce crude oil fluidity, optimize the sealing of high-permeability strips by the oil phase medium, and achieve overall profile control.

[0130] In one embodiment, the well-sealing operation lasts for 20 to 30 days.

[0131] S106: Control the equalization gas injection system to continuously inject air into the gas injection well.

[0132] Specifically, after deep profile control is completed, continuous air injection is used to enhance oil recovery. The oil phase medium blocks high-permeability channels in the formation, and the injected air allows for more even forward displacement, generating oxidation reactions, expanding the swept volume, and further improving the recovery rate.

[0133] In one embodiment, the air injection intensity is 500-5000 Nm. 3 / m, where N is the normal temperature and pressure under standard conditions.

[0134] In one embodiment, such as Figure 16 The diagram shows a uniform propulsion of air.

[0135] In one embodiment, the method further includes the following step before S106:

[0136] The balanced gas injection system is controlled to inject catalytic oxygen-consuming agent into the injection well based on the reservoir thickness.

[0137] Specifically, after deep profile control is completed, a catalytic oxygen-consuming agent is injected into the injection well. Its function is to accelerate the oxidation reaction between oxygen and crude oil, generating heat and gas, thereby reducing crude oil viscosity, improving fluidity, and expanding the swept volume. Simultaneously, the catalytic oxygen-consuming agent can precisely control the exothermic intensity of the oxidation reaction and the leading-edge propulsion speed, avoiding reservoir damage caused by localized high temperatures.

[0138] In one embodiment, the catalytic oxygen depleting agent comprises a transition metal salt or an organic peroxide, and the amount of catalytic oxygen depleting agent injected is (1–1.5) × hm. 3 , where h is the reservoir thickness.

[0139] Figure 3 This is a schematic flowchart of a balanced gas injection method for adjusting air injection depth profile according to an embodiment of this application, as shown below. Figure 3 As shown, before S101, it also includes:

[0140] S301: Obtain reservoir permeability, oil saturation, and formation temperature;

[0141] Specifically, the server acquires reservoir permeability distribution data, original oil saturation in the reservoir, and formation temperature. It needs to ensure that the data covers the injection well and adjacent production well areas, and pay special attention to the heterogeneous characteristics of the near-wellbore zone.

[0142] In one embodiment, the well pattern includes an inverted five-point vertical well pattern or an inverted seven-point vertical well pattern, etc., with an optimal well spacing of 200-400m, which can fully utilize the slug effect.

[0143] S302: Determine whether the permeability, the oil saturation, and the formation temperature meet the preset parameter conditions;

[0144] Specifically, the server compares the reservoir permeability distribution data, the original oil saturation in the reservoir, and the original formation temperature with the preset parameters. If all three parameters meet the standards, the reservoir is determined to be suitable for air injection development.

[0145] In one embodiment, the preset parameters are: permeability > 1 mD, oil saturation > 40%, and formation temperature > 50°C. Reservoirs meeting these conditions are suitable for air injection development. Specifically, a permeability > 1 mD ensures air injection drive capability, an oil saturation > 40% guarantees sufficient remaining oil to support oxidation and displacement effects, and a formation temperature > 50°C meets the conditions for initiating low-temperature oxidation reactions.

[0146] S303: If the permeability, the oil saturation and the formation temperature meet the preset parameter conditions, control the equalization gas injection system to perform crude oil saturation treatment on the near-wellbore area of ​​the gas injection well.

[0147] Specifically, after waterflooding development, the oil-water distribution near the injection well is uneven. Saturating the near-wellbore area with crude oil before injection improves the success rate of gas injection and also allows for profile control, ensuring uniform advancement of the injection front. Crude oil reinjection adjusts the oil-water distribution near the wellbore, reducing water saturation and forming a uniform oil front.

[0148] Figure 4 This is a schematic flowchart of a balanced gas injection method for adjusting air injection depth profile according to an embodiment of this application, as shown below. Figure 4 As shown, after S106, it also includes:

[0149] S401: Real-time monitoring of the pressure change rate of the production well;

[0150] Specifically, during the gas injection phase, as the thermal front advances towards the production well, underground fractures and high-water-cut channels formed by water drive can easily create dominant gas channeling pathways. Therefore, it is necessary to monitor the production well pressure in real time during gas injection and perform depth profile adjustments for wells with gas channeling risks. The server monitors changes in the casing pressure of the production well in real time. If the casing pressure of the production well rises too rapidly, it indicates that the well has a gas channeling risk.

[0151] In one embodiment, such as Figure 17 The diagram shown illustrates the air channeling during air injection.

[0152] S402: When the rate of pressure change exceeds a preset threshold, control the equalization gas injection system to perform deep profile adjustment to form a dynamic closed area.

[0153] Specifically, when the server detects that the pressure change rate of a production well exceeds a preset threshold, it indicates that the well has a risk of gas channeling. Steam and oil phase media are then injected into the production well for deep profile control. The server continuously adjusts the profile during production to create a dynamically closed zone, ensuring displacement pressure and improving displacement efficiency.

[0154] In one embodiment, the preset threshold is 0.5-2 MPa / d, that is, when the server detects that the casing pressure of the production well is rising at a rate of 0.5-2 MPa / d, the well has a risk of gas channeling.

[0155] In one embodiment, such as Figure 18 The diagram shown is a schematic of air injection depth profile adjustment.

[0156] Figure 5 This is a schematic flowchart of a balanced gas injection method for adjusting air injection depth profile according to an embodiment of this application, as shown below. Figure 5 As shown, S402 includes:

[0157] S501: Control the shutdown of the production well;

[0158] S502: Based on the wellhead pressure of the production well, control the equalization gas injection system to repeatedly inject steam and oil phase media into the production well to seal the high-permeability channels.

[0159] Specifically, when the server detects that the pressure change rate of the production well exceeds a preset threshold, it controls the production well to be shut down and uses the production well to inject steam and oil phase media for deep profile control, sealing the high-permeability channels around the bottom of the well and preventing gas from being driven into the production well.

[0160] Figure 6 This is a schematic flowchart of a balanced gas injection method for adjusting air injection depth profile according to an embodiment of this application, as shown below. Figure 6 As shown, S502 includes:

[0161] S601: Control the equalization gas injection system to inject steam into the production well;

[0162] Specifically, when gas channeling occurs during air injection, the production well is shut down, and depth profile control is performed using the production well. The server controls the equalization gas injection system to repeatedly inject steam and oil phase media into the production well to block high-permeability channels. First, the equalization gas injection system is controlled to inject steam into the production well.

[0163] In one embodiment, the steam injection rate is 60–100 m / s. 3 / d, the dryness at the bottom of the well is not less than 70%.

[0164] S602: Control the balanced gas injection system to inject oil phase medium into the production well;

[0165] Specifically, after steam injection is completed, the equalization gas injection system is controlled to inject oil phase medium into the production well to achieve alternating injection of steam and oil phase medium, thereby forming alternating sluices of steam and oil phase medium, thus blocking high permeability channels.

[0166] In one embodiment, the injection rate of the oil phase medium is 30–40 m / s. 3 / d, oil phase medium temperature is 100~120℃, injection volume is 0.0002×l 2 ×hm 3 , where l is the well spacing and h is the formation thickness.

[0167] In one embodiment, the viscosity of the oil phase medium is adjusted according to the formation permeability. When the permeability of the high-permeability strip is 2-6 mD, the viscosity of the oil phase medium is selected as 500-1000 mPa·s; when the permeability of the high-permeability strip is 6-10 mD, the viscosity of the oil phase medium is selected as 1000-3000 mPa·s; and when the permeability of the high-permeability strip is greater than 10 mD, the viscosity of the oil phase medium is selected as 3000-5000 mPa·s.

[0168] S603: Iteratively execute the above operations until the wellhead pressure of the production well exceeds the preset pressure value.

[0169] Specifically, the server monitors the wellhead pressure of the production well in real time. When the wellhead pressure of the production well exceeds the preset pressure value, the iteration stops. The slug can effectively block the high-permeability channels around the bottom of the well and prevent gas from being driven into the production well.

[0170] In one embodiment, the preset pressure value is 35 MPa. When the wellhead pressure of the production well exceeds 35 MPa, the iteration stops. At this time, the slug can effectively block the high-permeability channels around the bottom of the well and prevent gas from being driven into the production well.

[0171] In one embodiment, the injection parameters (including velocity and temperature) need to be dynamically adjusted during the iteration process to ensure that the slugs are evenly distributed and the wellhead pressure is controllable, thereby avoiding the risk of overpressure.

[0172] This application provides a balanced gas injection method for depth profile control. The method involves controlling a balanced gas injection system to inject steam into the injection well to raise the temperature of the wellbore and high-permeability zones. When the wellbore temperature exceeds a preset value, the balanced gas injection system stops injecting steam and injects an oil-phase medium into the injection well to seal the high-permeability zones. Based on the wellhead pressure, the balanced gas injection system repeatedly injects steam and an oil-phase medium into the injection well to form a slug. The system also injects hot foam liquid into the injection well to displace the oil-phase medium into the formation. The injection well is then shut down and a well-clogging operation is performed to reduce formation temperature and optimize the sealing effect of the oil-phase medium. By continuously injecting air into the injection well, the method effectively suppresses gas channeling and balances the gas spread during air injection development in low-permeability reservoirs. Through dynamic control of high-permeability channel sealing, optimization of oxidation reaction efficiency, and pressure balance, the method significantly improves crude oil displacement, ultimately greatly increasing the recovery rate and ensuring the safety and economy of the development process.

[0173] Specifically, by controlling the air injection depth and profile adjustment, a balanced gas injection system injects steam into the injection well to raise the temperature of the wellbore and high-permeability zones in the production well, thereby improving the fluidity of the oil phase medium and creating thermal conditions for subsequent plugging. When the temperature of the wellbore exceeds a preset value, the balanced gas injection system stops injecting steam and injects oil phase medium into the injection well to plug the high-permeability zones, thus sealing high-permeability channels, inhibiting gas cross-flow, and improving injection uniformity. Furthermore, by controlling the balanced gas injection system to repeatedly inject steam and oil phase medium into the injection well according to the wellhead pressure, a segment can be formed. The system can seal in layers of areas with different permeability levels, optimize profile control, and control wellhead pressure. By controlling the balanced gas injection system to inject hot foam liquid into the injection well to displace the oil phase medium into the formation, it can ensure unobstructed gas injection channels and reduce the risk of wellbore blockage. By controlling the closure of the injection well and performing a well-steaming operation to reduce formation temperature and optimize the sealing effect of the oil phase medium, it can enhance the sealing stability and prolong the duration of profile control. By controlling the balanced gas injection system to continuously inject air into the injection well, it can evenly inject air to trigger oxidation reactions, expand the thermal sweep volume, and drive efficient recovery of remaining oil.

[0174] Furthermore, the balanced air injection method and device for air injection depth profile adjustment proposed in this application have low cost, strong operability, and are more practical and scalable; at the same time, they can adapt to high temperature and high pressure conditions of air injection to seal high permeability strips; taking into account safety production factors, they can ensure safe and efficient production process.

[0175] Based on the same inventive concept, this application also provides an equalization gas injection device for adjusting air injection depth profile, which can be used to implement the method described in the above embodiments, as described in the following embodiments. Since the principle of the equalization gas injection device for adjusting air injection depth profile is similar to that of the equalization gas injection method for adjusting air injection depth profile, the implementation of the equalization gas injection device for adjusting air injection depth profile can refer to the implementation of the method based on software performance benchmarks, and will not be repeated. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0176] Figure 7 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application, as shown below. Figure 7 As shown, the device includes:

[0177] Steam injection unit 701 is used to control the equalization gas injection system for gas injection depth profile adjustment to inject steam into the gas injection well to increase the temperature of the wellbore and high-permeability strip of the production well.

[0178] The oil phase medium injection unit 702 is used to control the equalization gas injection system to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip when the temperature of the wellbore exceeds a preset temperature value.

[0179] The slug forming unit 703 is used to control the equalization gas injection system to repeatedly inject steam and oil phase medium into the gas injection well to form a slug based on the wellhead pressure of the gas injection well.

[0180] The hot foam injection unit 704 is used to control the equalization gas injection system to inject hot foam into the gas injection well to displace the oil phase medium into the formation.

[0181] The well-closing unit 705 is used to control the closure of the gas injection well and perform well-closing operation to reduce the formation temperature and optimize the sealing effect of the oil phase medium.

[0182] Air injection unit 706 is used to control the equalization gas injection system to continuously inject air into the gas injection well.

[0183] Figure 8 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application. Figure 7 Based on the embodiments, further, such as Figure 8 As shown, the equalization gas injection device for adjusting the air injection depth profile provided in this application further includes:

[0184] Steam injection module 801 is used to control the equalization gas injection system to inject steam into the gas injection well;

[0185] Oil phase medium injection module 802 is used to control the balanced gas injection system to inject oil phase medium into the gas injection well;

[0186] The iterative operation module 803 is used to iteratively execute the above operations until the wellhead pressure of the gas injection well exceeds the preset pressure value.

[0187] Figure 9 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application. Figure 7 Based on the embodiments, further, such as Figure 9 As shown, the equalization gas injection device for adjusting the air injection depth profile provided in this application further includes:

[0188] The catalytic oxygen depleting agent injection unit 901 is used to control the injection of catalytic oxygen depleting agent into the injection well by the balanced gas injection system according to the reservoir thickness.

[0189] Figure 10 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application. Figure 7 Based on the embodiments, further, such as Figure 10 As shown, the equalization gas injection device for adjusting the air injection depth profile provided in this application further includes:

[0190] The parameter acquisition unit 1001 is used to acquire the reservoir's permeability, oil saturation, and formation temperature.

[0191] The condition judgment unit 1002 is used to determine whether the permeability, the oil saturation and the formation temperature meet the preset parameter conditions;

[0192] The crude oil saturation treatment unit 1003 is used to control the equalization gas injection system to perform crude oil saturation treatment on the near-wellbore area of ​​the gas injection well if the permeability, the oil saturation and the formation temperature meet the preset parameter conditions.

[0193] Figure 11 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application. Figure 7 Based on the embodiments, further, such as Figure 11 As shown, the equalization gas injection device for adjusting the air injection depth profile provided in this application further includes:

[0194] Data monitoring unit 1101 is used to monitor the pressure change rate of the production well in real time;

[0195] The depth profile adjustment unit 1102 is used to control the equalization gas injection system to perform depth profile adjustment to form a dynamic closed area when the pressure change rate exceeds a preset threshold.

[0196] Figure 12 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application. Figure 11 Based on the embodiments, further, such as Figure 12 As shown, the equalization gas injection device for adjusting the air injection depth profile provided in this application further includes:

[0197] The production well shutdown module 1201 is used to control the shutdown of the production well;

[0198] The channel sealing module 1202 is used to control the equalization gas injection system to repeatedly inject steam and oil phase medium into the production well to seal the high-permeability channel according to the wellhead pressure of the production well.

[0199] Figure 13 This is a schematic diagram of the structure of a balanced air injection device for adjusting air injection depth according to an embodiment of this application. Figure 12 Based on the embodiments, further, such as Figure 13 As shown, the equalization gas injection device for adjusting the air injection depth profile provided in this application further includes:

[0200] Steam injection submodule 1301 is used to control the equalization gas injection system to inject steam into the production well;

[0201] Oil phase medium injection submodule 1302 is used to control the equalization gas injection system to inject oil phase medium into the production well;

[0202] The iterative operation submodule 1303 is used to iteratively execute the above operations until the wellhead pressure of the production well exceeds the preset pressure value.

[0203] This application provides a balanced gas injection method for depth profile control. The method involves controlling a balanced gas injection system to inject steam into the injection well to raise the temperature of the wellbore and high-permeability zones. When the wellbore temperature exceeds a preset value, the balanced gas injection system stops injecting steam and injects an oil-phase medium into the injection well to seal the high-permeability zones. Based on the wellhead pressure, the balanced gas injection system repeatedly injects steam and an oil-phase medium into the injection well to form a slug. The system also injects hot foam liquid into the injection well to displace the oil-phase medium into the formation. The injection well is then shut down and a well-clogging operation is performed to reduce formation temperature and optimize the sealing effect of the oil-phase medium. By continuously injecting air into the injection well, the method effectively suppresses gas channeling and balances the gas spread during air injection development in low-permeability reservoirs. Through dynamic control of high-permeability channel sealing, optimization of oxidation reaction efficiency, and pressure balance, the method significantly improves crude oil displacement, ultimately greatly increasing the recovery rate and ensuring the safety and economy of the development process.

[0204] Specifically, by controlling the air injection depth and profile adjustment, a balanced gas injection system injects steam into the injection well to raise the temperature of the wellbore and high-permeability zones in the production well, thereby improving the fluidity of the oil phase medium and creating thermal conditions for subsequent plugging. When the temperature of the wellbore exceeds a preset value, the balanced gas injection system stops injecting steam and injects oil phase medium into the injection well to plug the high-permeability zones, thus sealing high-permeability channels, inhibiting gas cross-flow, and improving injection uniformity. Furthermore, by controlling the balanced gas injection system to repeatedly inject steam and oil phase medium into the injection well according to the wellhead pressure, a segment can be formed. The system can seal in layers of areas with different permeability levels, optimize profile control, and control wellhead pressure. By controlling the balanced gas injection system to inject hot foam liquid into the injection well to displace the oil phase medium into the formation, it can ensure unobstructed gas injection channels and reduce the risk of wellbore blockage. By controlling the closure of the injection well and performing a well-steaming operation to reduce formation temperature and optimize the sealing effect of the oil phase medium, it can enhance the sealing stability and prolong the duration of profile control. By controlling the balanced gas injection system to continuously inject air into the injection well, it can evenly inject air to trigger oxidation reactions, expand the thermal sweep volume, and drive efficient recovery of remaining oil.

[0205] Furthermore, the balanced air injection method and device for air injection depth profile adjustment proposed in this application have low cost, strong operability, and are more practical and scalable; at the same time, they can adapt to high temperature and high pressure conditions of air injection to seal high permeability strips; taking into account safety production factors, they can ensure safe and efficient production process.

[0206] In addition, this application also provides a balanced air injection system for adjusting air injection depth profile, used to implement the balanced air injection method for adjusting air injection depth profile provided in any of the above embodiments, including: a steam injection device, an oil phase medium injection device, a hot foam liquid injection device, a catalytic oxygen depletor injection device, and an air injection device.

[0207] From a hardware perspective, in order to address the problems in the prior art, this application provides an embodiment of an electronic device for implementing all or part of the balanced gas injection method for adjusting the injection depth, wherein the electronic device specifically includes the following:

[0208] The system comprises a processor, a memory, a communications interface, and a bus; wherein the processor, memory, and communications interface communicate with each other via the bus; the communications interface is used to transmit information between the air injection depth profile equalization injection device and core business systems, user terminals, and related databases and other related devices; the logic controller can be a desktop computer, tablet computer, or mobile terminal, etc., and this embodiment is not limited to these. In this embodiment, the logic controller can be implemented with reference to the embodiments of the air injection depth profile equalization injection method and the air injection depth profile equalization injection device in the embodiments, the contents of which are incorporated herein, and repeated details will not be described again.

[0209] It is understood that the user terminal may include smartphones, tablet computers, network set-top boxes, portable computers, desktop computers, personal digital assistants (PDAs), in-vehicle devices, smart wearable devices, etc. Among these, the smart wearable devices may include smart glasses, smartwatches, smart bracelets, etc.

[0210] In practical applications, the balanced gas injection method for adjusting the air injection depth profile can be partially executed on the electronic device side as described above, or all operations can be completed in the client device. The choice can be made based on the processing power of the client device and the limitations of the user's usage scenario. This application does not impose any limitations on this. If all operations are completed in the client device, the client device may further include a processor.

[0211] The aforementioned client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission. The server may include a server on the task scheduling center side; in other implementation scenarios, it may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, a server cluster consisting of multiple servers, or a distributed server structure.

[0212] Figure 14 This is a schematic block diagram illustrating the system configuration of the electronic device 9600 according to an embodiment of this application. Figure 14 As shown, the electronic device 9600 may include a central processing unit 9100 and a memory 9140; the memory 9140 is coupled to the central processing unit 9100. It is worth noting that... Figure 14 This is an example; other types of structures can also be used to supplement or replace this structure to achieve telecommunications functions or other functions.

[0213] In one embodiment, the function of the equalization gas injection method for adjusting the air injection depth profile can be integrated into the central processing unit 9100. The central processing unit 9100 can be configured to perform the following control:

[0214] S101: A balanced gas injection system that controls the depth of air injection profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strip of the production well.

[0215] S102: When the temperature of the wellbore exceeds the preset temperature value, control the equalization gas injection system to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip;

[0216] S103: Control the equalization gas injection system to repeatedly inject steam and oil phase medium into the gas injection well to form a slug based on the wellhead pressure of the gas injection well;

[0217] S104: Control the equalization gas injection system to inject hot foam liquid into the gas injection well to displace the oil phase medium into the formation;

[0218] S105: Control the gas injection well to close and perform a well-clogging operation to reduce formation temperature and optimize the sealing effect of oil phase medium;

[0219] S106: Control the equalization gas injection system to continuously inject air into the gas injection well.

[0220] As can be seen from the above description, the balanced gas injection method and device for air injection depth profile control provided in this application effectively suppresses gas channeling and balances the gas sweep range during the air injection development of low-permeability reservoirs. By dynamically controlling the blocking of high-permeability channels, optimizing oxidation reaction efficiency and pressure balance, it significantly improves the crude oil displacement effect, ultimately greatly increasing the recovery rate and ensuring the safety and economy of the development process.

[0221] In another embodiment, the equalization gas injection device for air depth profile adjustment can be configured separately from the central processing unit 9100. For example, the equalization gas injection device for air depth profile adjustment can be configured as a chip connected to the central processing unit 9100, and the function of the equalization gas injection method for air depth profile adjustment can be realized through the control of the central processing unit.

[0222] like Figure 14 As shown, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily need to include these components. Figure 14 All components shown; in addition, the electronic device 9600 may also include Figure 14 For components not shown, please refer to existing technologies.

[0223] like Figure 14 As shown, the central processing unit 9100, sometimes also referred to as a controller or operating control, may include a microprocessor or other processor device and / or logic device, which receives inputs and controls the operation of various components of the electronic device 9600.

[0224] The memory 9140 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information, and also store a program for executing that information. The central processing unit 9100 may execute the program stored in the memory 9140 to perform information storage or processing, etc.

[0225] Input unit 9120 provides input to central processing unit 9100. Input unit 9120 may be, for example, a keypad or touch input device. Power supply 9170 provides power to electronic device 9600. Display 9160 displays images and text. Display may be, for example, an LCD display, but is not limited thereto.

[0226] The memory 9140 can be a solid-state memory, such as a read-only memory (ROM), random access memory (RAM), a SIM card, etc. It can also be a memory that retains information even when power is off, can be selectively erased, and contains more data; examples of this type of memory are sometimes referred to as EPROMs. The memory 9140 can also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142 for storing application programs and function programs or processes for executing the operation of the electronic device 9600 via the central processing unit 9100.

[0227] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for the electronic device's communication functions and / or for performing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0228] The communication module 9110 is a transmitter / receiver 9110 that transmits and receives signals via the antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processing unit 9100 to provide input signals and receive output signals, which can be the same as in a conventional mobile communication terminal.

[0229] Based on different communication technologies, multiple communication modules 9110 can be configured in the same electronic device, such as cellular network modules, Bluetooth modules, and / or wireless LAN modules. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby realizing typical telecommunications functions. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. Additionally, the audio processor 9130 is also coupled to a central processing unit 9100, enabling on-device recording via the microphone 9132 and on-device playback of stored sound via the speaker 9131.

[0230] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the equalization gas injection method for air injection depth profile control with a server or client as the execution subject in the above embodiments. The computer-readable storage medium stores a computer program that, when executed by a processor, implements all steps of the equalization gas injection method for air injection depth profile control with a server or client as the execution subject in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0231] S101: A balanced gas injection system that controls the depth of air injection profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strip of the production well.

[0232] S102: When the temperature of the wellbore exceeds the preset temperature value, control the equalization gas injection system to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip;

[0233] S103: Control the equalization gas injection system to repeatedly inject steam and oil phase medium into the gas injection well to form a slug based on the wellhead pressure of the gas injection well;

[0234] S104: Control the equalization gas injection system to inject hot foam liquid into the gas injection well to displace the oil phase medium into the formation;

[0235] S105: Control the gas injection well to close and perform a well-clogging operation to reduce formation temperature and optimize the sealing effect of oil phase medium;

[0236] S106: Control the equalization gas injection system to continuously inject air into the gas injection well.

[0237] As can be seen from the above description, the balanced gas injection method and device for air injection depth profile control provided in this application effectively suppresses gas channeling and balances the gas sweep range during the air injection development of low-permeability reservoirs. By dynamically controlling the blocking of high-permeability channels, optimizing oxidation reaction efficiency and pressure balance, it significantly improves the crude oil displacement effect, ultimately greatly increasing the recovery rate and ensuring the safety and economy of the development process.

[0238] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, 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.

[0239] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), 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.

[0240] 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.

[0241] 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.

[0242] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for balanced air injection with air injection depth profile adjustment, characterized in that, include: A balanced gas injection system that controls the depth of air injection profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strips of the production well; When the temperature of the wellbore exceeds the preset temperature value, the equalization gas injection system is controlled to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip; The equalization gas injection system is controlled to repeatedly inject steam and oil phase medium into the gas injection well to form a slug, based on the wellhead pressure of the gas injection well. The balanced gas injection system is controlled to inject hot foam fluid into the gas injection well to displace the oil phase medium into the formation. The gas injection well is shut down and a well-steaming operation is performed to reduce the formation temperature and optimize the sealing effect of the oil phase medium. The equalization gas injection system is controlled to continuously inject air into the injection well.

2. The balanced gas injection method for adjusting air injection depth profile according to claim 1, characterized in that, The step of controlling the equalization injection system to repeatedly inject steam and oil phase media into the injection well to form a slug based on the wellhead pressure of the injection well includes: The equalization gas injection system is controlled to inject steam into the injection well; The balanced gas injection system is controlled to inject oil phase medium into the gas injection well; The above operations are performed iteratively until the wellhead pressure of the gas injection well exceeds the preset pressure value.

3. The balanced gas injection method for adjusting air injection depth profile according to claim 1, characterized in that, Before controlling the equalization gas injection system to continuously inject air into the injection well, the method further includes: The balanced gas injection system is controlled to inject catalytic oxygen-consuming agent into the injection well based on the reservoir thickness.

4. The balanced gas injection method for adjusting air injection depth profile according to claim 1, characterized in that, Before the balanced gas injection system for controlling the gas injection depth profile adjustment injects steam into the injection well to raise the temperature of the wellbore and high-permeability strip of the production well, it also includes: To obtain the reservoir's permeability, oil saturation, and formation temperature; Determine whether the permeability, oil saturation, and formation temperature meet the preset parameter conditions; If the permeability, oil saturation, and formation temperature meet the preset parameter conditions, the balanced gas injection system is controlled to perform crude oil saturation treatment on the near-wellbore area of ​​the gas injection well.

5. The balanced gas injection method for adjusting air injection depth profile according to claim 1, characterized in that, After controlling the equalization gas injection system to continuously inject air into the injection well, the method further includes: Real-time monitoring of the pressure change rate of the production well; When the rate of pressure change exceeds a preset threshold, the equalization gas injection system is controlled to perform deep profile adjustment to form a dynamic closed region.

6. The balanced gas injection method for adjusting air injection depth profile according to claim 5, characterized in that, The control of the equalization gas injection system to perform depth profile adjustment to form a dynamic closed region includes: Control the shutdown of the production well; The equalization gas injection system is controlled to repeatedly inject steam and oil phase media into the production well to seal high-permeability channels, based on the wellhead pressure of the production well.

7. The balanced gas injection method for adjusting air injection depth profile according to claim 6, characterized in that, The step of controlling the equalization gas injection system to repeatedly inject steam and oil phase media into the production well to seal high-permeability channels based on the wellhead pressure of the production well includes: The equalization gas injection system is controlled to inject steam into the production well; Control the equalization gas injection system to inject oil phase medium into the production well; The above operations are performed iteratively until the wellhead pressure of the production well exceeds the preset pressure value.

8. A balanced air injection device for adjusting air injection depth profile, characterized in that, include: The steam injection unit is used to control the equalization gas injection system for gas injection depth profile adjustment to inject steam into the gas injection well to raise the temperature of the wellbore and high-permeability strip of the production well. The oil phase medium injection unit is used to control the equalization gas injection system to stop injecting steam and inject oil phase medium into the gas injection well to seal the high-permeability strip when the temperature of the wellbore exceeds a preset temperature value. A slug forming unit is used to control the equalization gas injection system to repeatedly inject steam and oil phase medium into the gas injection well to form a slug based on the wellhead pressure of the gas injection well. A hot foam injection unit is used to control the equalization gas injection system to inject hot foam into the gas injection well to displace the oil phase medium into the formation. The well-closing unit is used to control the closure of the gas injection well and perform well-closing operations to reduce formation temperature and optimize the sealing effect of oil phase media. An air injection unit is used to control the equalization gas injection system to continuously inject air into the gas injection well.

9. The balanced air injection device for adjusting air injection depth according to claim 8, characterized in that, The slug forming unit includes: A steam injection module is used to control the equalization gas injection system to inject steam into the injection well; An oil phase medium injection module is used to control the equalization gas injection system to inject oil phase medium into the gas injection well; The iterative operation module is used to iteratively execute the above operations until the wellhead pressure of the gas injection well exceeds the preset pressure value.

10. The balanced air injection device for adjusting air injection depth according to claim 8, characterized in that, Also includes: A catalytic oxygen-consuming agent injection unit is used to control the injection of catalytic oxygen-consuming agent into the injection well by the balanced gas injection system according to the reservoir thickness.

11. The balanced air injection device for adjusting air injection depth according to claim 8, characterized in that, Also includes: The parameter acquisition unit is used to acquire reservoir permeability, oil saturation, and formation temperature. The condition judgment unit is used to determine whether the permeability, the oil saturation and the formation temperature meet the preset parameter conditions; The crude oil saturation treatment unit is used to control the equalization gas injection system to perform crude oil saturation treatment on the near-wellbore area of ​​the gas injection well if the permeability, the oil saturation and the formation temperature meet the preset parameter conditions.

12. The balanced air injection device for adjusting air injection depth according to claim 8, characterized in that, Also includes: The data monitoring unit is used to monitor the rate of pressure change of the production well in real time; The depth profile adjustment unit is used to control the equalization gas injection system to perform depth profile adjustment to form a dynamic closed area when the pressure change rate exceeds a preset threshold.

13. The balanced air injection device for adjusting air injection depth according to claim 12, characterized in that, The depth profile adjustment unit includes: A production well shutdown module is used to control the shutdown of the production well; The channel plugging module is used to control the equalization gas injection system to repeatedly inject steam and oil phase media into the production well to plug the high-permeability channels based on the wellhead pressure of the production well.

14. The balanced air injection device for adjusting air injection depth according to claim 13, characterized in that, The channel blocking module includes: A steam injection submodule is used to control the equalization gas injection system to inject steam into the production well; The oil phase medium injection submodule is used to control the equalization gas injection system to inject oil phase medium into the production well; The iterative operation submodule is used to iteratively execute the above operations until the wellhead pressure of the production well exceeds the preset pressure value.

15. A balanced air injection system for adjusting air injection depth profile, used to implement the balanced air injection method for adjusting air injection depth profile as described in any one of claims 1-7, characterized in that, include: Steam injection device, oil phase medium injection device, hot foam liquid injection device, catalytic oxygen depletor injection device and air injection device.

16. 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 according to any one of claims 1 to 7.

17. 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 according to any one of claims 1 to 7.

18. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method according to any one of claims 1 to 7.

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