Gas lift construction method and system

Abstract

The gas lift construction method comprises the steps that hydrops information of an oil and gas well to be constructed is obtained, the target gas pressure and the target gas internal energy, needed for discharging current hydrops, in an annulus are determined according to the hydrops information, and the annulus is located between a sleeve and an oil pipe; gas injection and pressure supplementation are conducted on the to-be-constructed oil and gas well through the annulus until the actual gas pressure in the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy, and gas injection and pressure supplementation of the current round are paused; and after the gas injection pressure supplement of the current round is paused, the liquid accumulation state is monitored in real time, and when the liquid column height of the accumulated liquid in the annulus reaches a preset liquid column height threshold value, liquid accumulation information is obtained again, and gas injection pressure supplement of the next round is started. The gas lift efficiency is improved, the gas lift duration is greatly shortened, and the gas injection amount is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas extraction, and in particular relates to a gas lift construction method and system. Background Technology

[0002] Currently, gas lift is one of the main methods for draining and stabilizing the production of shale gas and tight gas. Traditional continuous gas lift methods involve continuous gas injection from start-up to wellhead fluid production, resulting in long injection times, high gas consumption, and low production efficiency. With the increasing adoption of cluster wells and platform wells, the number of wells on the same platform is increasing, leading to a greater workload for gas lift. Traditional continuous gas lift methods are struggling to meet the demands of high-efficiency gas lift in platform wells.

[0003] In developing this invention, the inventors discovered that not all well sections require continuous gas injection. Intermittent, short-term gas replenishment followed by cessation of injection can utilize the expansion energy of the replenished gas to achieve self-drainage. Therefore, there is an urgent need for an intermittent pressure-replenishing gas lift approach, transforming the traditional continuous gas lift mode into an intermittent, short-term pressure-replenishing mode. This utilizes the expansion energy of the gas after each cycle of cessation to carry the liquid column out, thereby reducing gas lift duration and injection volume, and improving gas lift efficiency. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a gas lift construction method, comprising: acquiring fluid accumulation information of the oil and gas well to be constructed, and determining, based on the fluid accumulation information, the target gas pressure and target gas internal energy within the annulus required to remove the current fluid accumulation, wherein the annulus is located between the casing and the tubing; injecting gas into the oil and gas well to be constructed through the annulus until the actual gas pressure within the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy, and pausing the current round of gas injection and pressure replenishment; after the current round of gas injection and pressure replenishment is paused, monitoring the fluid accumulation status in real time, and when the liquid column height of the fluid accumulation within the annulus reaches a preset liquid column height threshold, reacquiring the fluid accumulation information and starting the next round of gas injection and pressure replenishment.

[0005] Preferably, the step of determining the target gas pressure in the annulus required to remove the current accumulating fluid based on the accumulating fluid information includes: obtaining the target gas pressure using the wellhead back pressure and the pressure of the accumulating fluid in the tubing.

[0006] Preferably, the target gas pressure is calculated using the following expression:

[0007] P2=P0+ρ L gH2

[0008] Where P2 represents the target gas pressure, P0 represents the wellhead back pressure, and ρ L H represents the density of the liquid, g represents the acceleration due to gravity, and H2 represents the height of the liquid column in the tubing.

[0009] Preferably, the step of determining the target gas internal energy in the annulus required to remove the current accumulating fluid based on the accumulating fluid information includes: obtaining the target gas internal energy by using the target gas pressure, combined with the bottom hole pressure and the bottom hole gas volume.

[0010] Preferably, the internal energy of the target gas is calculated using the following expression:

[0011] W = 0.5(P0 + ρ L gH2+P wf V3

[0012] Where W represents the internal energy of the target gas, P0 represents the wellhead back pressure, and ρ L Let H2 represent the density of the accumulated fluid, g represent the acceleration due to gravity, H2 represent the height of the liquid column in the tubing, and P represent the density of the accumulated fluid. wf V3 represents the bottom hole pressure, and V3 represents the bottom hole gas volume.

[0013] Preferably, the gas lift construction method further includes: using the wellhead back pressure and the pressure of the fluid accumulated in the tubing, combined with the tubing operation parameters and gas injection parameters, to obtain the bottom hole pressure.

[0014] Preferably, the bottom hole pressure is calculated using the following expression:

[0015]

[0016] Among them, P wf P0 represents the bottom hole pressure, P0 represents the wellhead back pressure, and ρ represents the bottom hole pressure. L H2 represents the density of the accumulated fluid, g represents the acceleration due to gravity, H2 represents the height of the fluid column in the tubing, and γ represents the density of the accumulated fluid. i The gas density is represented by H, the tubing depth is represented by T. i This indicates the gas injection temperature.

[0017] Preferably, the fluid accumulation information includes, but is not limited to: the height of the fluid column in the annulus, the height of the fluid column in the tubing, and the wellhead back pressure.

[0018] The present invention also provides a computer-readable storage medium comprising a series of instructions for performing steps of an air lift construction method.

[0019] On the other hand, the present invention also provides a gas lift construction system, which includes the following modules: a parameter determination module, which is used to acquire the liquid accumulation information of the oil and gas well to be constructed, and determine the target gas pressure and target gas internal energy in the annulus required to remove the current liquid accumulation based on the liquid accumulation information, wherein the annulus is located between the casing and the tubing; a gas injection and pressurization module, which is used to inject gas into the oil and gas well to be constructed through the annulus until the actual gas pressure in the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy, and then suspend the current round of gas injection and pressurization; and a liquid accumulation monitoring module, which is used to monitor the liquid accumulation status in real time after the current round of gas injection and pressurization is suspended, and when the liquid column height in the annulus reaches a preset liquid column height threshold, reacquire the liquid accumulation information and start the next round of gas injection and pressurization.

[0020] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0021] This invention proposes a gas lift construction method and system. The method first determines the gas injection and pressure replenishment parameters (e.g., gas pressure and internal energy in the annulus between the casing and tubing) for gas lift construction, based on the accumulated fluid information of the oil and gas well to be constructed. Then, gas is injected into the oil and gas well through the annulus until the actual injection and pressure replenishment parameters reach the determined parameters, at which point the current round of injection and pressure replenishment is paused. Finally, after the current round of injection and pressure replenishment is paused, the accumulated fluid information is reacquired in real time based on the real-time fluid status, and the next round of injection and pressure replenishment is initiated. This invention transforms the traditional continuous gas lift mode into an intermittent, short-term pressure replenishment mode, shortening the gas lift duration for a single well, improving the gas lift efficiency of cluster well groups, and saving on gas lift equipment investment. Simultaneously, this invention reduces the gas injection volume, further saving on gas source and gas lift operating costs.

[0022] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a step diagram of the airlift construction method according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram illustrating the changes in the liquid state during the air-lift construction method according to an embodiment of this application.

[0026] Figure 3 This is a block diagram of the airlift construction system according to an embodiment of this application. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that, as long as there is no conflict, the various embodiments and features in the various embodiments of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0028] Furthermore, the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0029] In practical applications, not all well sections require continuous gas injection. Intermittent, short-term gas replenishment followed by cessation of injection can utilize the expansion energy of the replenished gas to achieve self-drainage. Therefore, there is an urgent need for an intermittent pressure-replenishing gas lift approach, transforming the traditional continuous gas lift mode into an intermittent, short-term pressure-replenishing mode. This approach utilizes the expansion energy of the gas after each cycle of cessation to carry the liquid column out, thereby reducing gas lift duration and injection volume, and improving gas lift efficiency.

[0030] Therefore, to solve the above problems, this invention proposes a gas lift construction method and system. The method first determines the gas injection and pressure replenishment parameters (e.g., gas pressure and internal energy in the annulus between the casing and tubing) for gas lift construction and to remove the current accumulated fluid, based on the fluid accumulation information of the oil and gas well to be constructed. Then, gas is injected into the oil and gas well through the annulus until the actual injection and pressure replenishment parameters reach the determined parameters, at which point the current round of injection and pressure replenishment is paused. Finally, after the current round of injection and pressure replenishment is paused, the fluid accumulation information is re-acquired based on the real-time fluid accumulation status, and the next round of injection and pressure replenishment is initiated. This invention transforms the traditional continuous gas lift mode into an intermittent, short-term pressure replenishment mode, shortening the gas lift duration for a single well, improving the gas lift efficiency of cluster well groups, and saving investment in gas lift equipment. Simultaneously, this invention reduces the gas injection volume, further saving on gas source and gas lift operating costs.

[0031] Example 1

[0032] Figure 1 This is a flowchart illustrating the air-lift construction method according to an embodiment of this application. See below for reference. Figure 1 This will explain each step of the method.

[0033] like Figure 1 As shown, in step S110, the fluid accumulation information of the oil and gas well to be constructed is obtained, and based on the fluid accumulation information, the target gas pressure and target gas internal energy in the annulus required to remove the current fluid accumulation are determined. The annulus is located between the casing and the tubing. In practical applications, not all well sections require continuous gas injection. For most well sections, intermittently replenishing a certain amount of gas and then stopping injection can achieve the same fluid removal effect as continuous gas injection. That is, during the cessation of injection after a certain injection process, the expansion energy of the gas replenished during that injection process can also achieve self-fluid removal. Therefore, this embodiment first uses an echo sounder to obtain the fluid accumulation information of the oil and gas well to be constructed. Then, based on the obtained fluid accumulation information, the target gas pressure in the annulus between the casing and the tubing required to remove the current fluid accumulation is determined. If the gas pressure replenished into the annulus makes the actual gas pressure in the annulus meet the determined target gas pressure, it is sufficient to initiate the liquid column of fluid accumulation in the tubing. At the same time, based on the acquired fluid accumulation information, the target gas internal energy in the annulus required to remove the current fluid accumulation is determined. If the gas pressure added to the annulus makes the actual gas internal energy in the annulus meet the determined target gas internal energy, it is sufficient to push the liquid column of fluid accumulation in the tubing to the wellhead for discharge.

[0034] In summary, this embodiment, when determining the gas pressure required to remove the current accumulated fluid in the annulus between the casing and tubing, assumes that the injected gas used for pressurization expands and pushes all the accumulated fluid in the current annulus into the tubing. Based on the law of expansion, the corresponding target gas pressure can be obtained. Similarly, in determining the target gas internal energy required to remove the current accumulated fluid, this embodiment assumes that the injected gas continues to expand, just enough to push the liquid column of accumulated fluid in the tubing to the wellhead, thus obtaining the corresponding target gas internal energy.

[0035] In one specific embodiment of this application, the fluid accumulation information includes, but is not limited to: the height of the fluid column in the annulus, the height of the fluid column in the tubing, and the wellhead back pressure.

[0036] Figure 2 This is a schematic diagram illustrating the changes in the liquid state during the air-lift construction method according to an embodiment of this application. See below for reference. Figure 2 The changes in the state of the accumulated fluid in this method are described in detail.

[0037] In the step of determining the target gas pressure in the annulus required to remove the current accumulating fluid based on the accumulating fluid information, the target gas pressure is obtained by utilizing the wellhead back pressure and the pressure of the accumulating fluid in the tubing. Figure 2 The left side shows a schematic diagram of the initial liquid accumulation state of the oil and gas well to be constructed (V1 represents the actual gas volume in the annulus). Figure 2The diagram in the middle illustrates the critical fluid accumulation state for initiating fluid accumulation in the tubing of an oil and gas well to be constructed. In practical applications, the gas pressure replenished into the annulus must first be sufficient to initiate the fluid column in the tubing through the fluid column in the annulus. Initiating the fluid column in the tubing requires overcoming the resistance caused by both the wellhead back pressure and the pressure of the fluid in the tubing. In other words, only when the internal energy of the first actual gas in the annulus reaches the first target gas energy required to initiate the fluid column in the tubing can the fluid column be initiated and have the ability to move towards the wellhead. To ensure this capability, it is also necessary to ensure that all the fluid in the annulus can be discharged from the annulus to the bottom of the well or enter the tubing through the bottom of the well. Therefore, this embodiment uses the fact that the volume of gas replenished into the annulus is the same as the volume of the annulus as a prerequisite for initiating the fluid column in the tubing. This simplifies the calculation process; it is not necessary to determine whether the internal energy of the first actual gas reaches the aforementioned first target gas energy, but only whether the actual gas injection pressure reaches the target gas injection pressure. In this embodiment, the target gas pressure is obtained by utilizing the back pressure at the wellhead and the pressure of the fluid accumulated in the tubing. Therefore, this embodiment effectively simplifies the calculation process, improves the efficiency of determining the termination point of the corresponding gas injection cycle in the following text, and thus ensures the timeliness of pausing the gas injection process.

[0038] In one specific embodiment of this application, the target gas pressure is calculated using the following expression:

[0039] P2=P0+ρ L gH2 (1)

[0040] Where P2 represents the target gas pressure, P0 represents the wellhead back pressure, and ρ L H represents the density of the liquid, g represents the acceleration due to gravity, and H2 represents the height of the liquid column in the tubing.

[0041] In one specific embodiment of this application, the height of the liquid column in the tubing is calculated using the following expression:

[0042] H2 = H1 + H a A a / A t (2)

[0043] Among them, A t H represents the cross-sectional area of ​​the tubing, H1 represents the initial height of the liquid column inside the tubing, and H... a Aa represents the initial height of the liquid column in the annulus, and Aa represents the cross-sectional area of ​​the annulus.

[0044] Next, in the step of determining the target gas internal energy in the annulus required to remove the current accumulating fluid based on the accumulating fluid information, the target gas internal energy is obtained by using the target gas pressure, combined with the bottom hole pressure and the bottom hole gas volume. Figure 2The diagram on the right illustrates the critical state of fluid accumulation in the tubing of an oil and gas well, where a column of liquid pushes the fluid to the wellhead for discharge. In practical applications, after the fluid column in the tubing is initiated, the gas pressure supplied to the annulus must be sufficient to push the fluid column through the wellbore to the wellhead for discharge. This requires overcoming not only the resistance caused by the wellhead back pressure and the pressure of the fluid in the tubing, but also the resistance caused by the bottomhole pressure. Therefore, this embodiment utilizes the target gas pressure, combined with the bottomhole pressure, to obtain the target bottomhole gas pressure, and further combines this with the bottomhole gas volume to obtain the target gas internal energy.

[0045] In one specific embodiment of this application, the target bottom hole gas pressure is calculated using the following expression:

[0046] P3 = 0.5(P0 + ρ L gH2+P wf (4)

[0047] Where P3 represents the target bottom hole gas pressure, P wf This indicates the pressure at the bottom of the well.

[0048] Furthermore, in one specific embodiment of this application, the internal energy of the target gas is calculated using the following expression:

[0049] W = 0.5(P0 + ρ L gH2+P wf V3 (5)

[0050] Where V3 represents the volume of gas at the bottom of the well, and W represents the internal energy of the target gas.

[0051] In one specific embodiment of this application, the bottom hole gas volume is calculated using the following expression:

[0052] V3=(H-H2)A t +V2 (6)

[0053] Where H represents the depth of the tubing and V2 represents the annulus volume.

[0054] Furthermore, this embodiment also utilizes the wellhead back pressure and the pressure of the fluid accumulated in the tubing, combined with tubing operation parameters and gas injection parameters, to obtain the bottom hole pressure. Specifically, this embodiment utilizes the wellhead back pressure and the pressure of the fluid accumulated in the tubing (or directly uses the calculated target gas pressure), further combined with the tubing depth in the tubing operation parameters, and the relative density and temperature of the injected gas in the gas injection parameters, to finally calculate the bottom hole pressure.

[0055] In one specific embodiment of this application, the bottom hole pressure is calculated using the following expression:

[0056]

[0057] Where, γ i T represents the relative density of the injected gas. i This indicates the gas injection temperature.

[0058] Further, in step S120, gas injection is performed into the well to be constructed via the annulus until the actual gas pressure in the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy, at which point the current round of gas injection is paused. Specifically, this embodiment transforms the traditional continuous gas lift mode into an intermittent short-term pressure replenishment mode, that is, a round of gas injection is started at regular intervals, and injection is stopped after the completion of the round of gas injection, and then the next round of gas injection is started at an appropriate time. It is evident that determining the termination point of each round of gas injection is crucial. Therefore, this embodiment acquires the actual gas pressure in the annulus and the actual gas internal energy in the tubing in real time during each round of gas injection, and uses the moment when the actual gas pressure in the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy as the termination point of the corresponding round of gas injection, thereby pausing the current round of gas injection according to the termination point.

[0059] In one specific embodiment of this application, the actual gas pressure in the annulus is calculated using the following expression:

[0060]

[0061] Where P1 represents the actual gas pressure in the annulus, P i This represents the pressure at the annular wellhead location, and e represents the natural constant.

[0062] Furthermore, in step S130, after the current round of gas injection and pressurization is paused, the liquid accumulation status is monitored in real time. When the liquid column height in the annulus reaches a preset liquid column height threshold, the liquid accumulation information is reacquired and the next round of gas injection and pressurization is started. Specifically, this embodiment transforms the traditional continuous gas lift mode into an intermittent short-time pressurization mode, that is, a round of gas injection is started at regular intervals, and gas injection is stopped after the completion of the round of gas injection, and then the next round of gas injection is started at an appropriate time. It can be seen that determining the start node of each round of gas injection is very important. Therefore, in this embodiment, after the current round of gas injection and pressurization is paused, the liquid accumulation status is monitored in real time. Then, by comparing the preset liquid column height threshold indicating that the gas injection process needs to be started with the liquid column height in the annulus in real time, the moment when the liquid column height in the annulus reaches the preset liquid column height threshold is taken as the start node of the corresponding round of gas injection, and the liquid accumulation information is reacquired according to the start node and the next round of gas injection and pressurization is started. Therefore, this invention effectively shortens the gas lift time of a single well and reduces the gas injection volume, thereby achieving cost savings while improving gas lift efficiency.

[0063] Example 2

[0064] This invention also provides a computer-readable storage medium storing at least one instruction that is loaded and executed by a processor to perform the airlift construction operation performed in the method of the above embodiments. For example, the computer-readable storage medium may be ROM (Read Only Memory), RAM (Random Access Memory), CD-ROM (Compact Disc-Read Only Memory), magnetic tape, floppy disk, and optical data storage device, etc.

[0065] Example 3

[0066] Based on the air lift construction method described in Embodiment 1 above, this invention also provides an air lift construction system. Figure 3 This is a block diagram of the airlift construction system according to an embodiment of this application.

[0067] like Figure 3 As shown, the gas lift construction system in this embodiment of the invention includes: a parameter determination module 31, a gas injection and pressure replenishment module 32, and a liquid accumulation monitoring module 33. Specifically, the parameter determination module 31 is implemented according to the method described in step S110 above, configured to acquire the liquid accumulation information of the oil and gas well to be constructed, and determine the target gas pressure and target gas internal energy in the annulus required to remove the current liquid accumulation based on the liquid accumulation information, wherein the annulus is located between the casing and the tubing; the gas injection and pressure replenishment module 32 is implemented according to the method described in step S120 above, configured to inject gas into the oil and gas well to be constructed through the annulus until the actual gas pressure in the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy, and then suspend the current round of gas injection and pressure replenishment; the liquid accumulation monitoring module 33 is implemented according to the method described in step S130 above, configured to monitor the liquid accumulation status in real time after the current round of gas injection and pressure replenishment is suspended, and when the liquid column height in the annulus reaches a preset liquid column height threshold, reacquire the liquid accumulation information and start the next round of gas injection and pressure replenishment.

[0068] This invention proposes a gas lift construction method and system. The method first determines the gas injection and pressure replenishment parameters (e.g., gas pressure and internal energy in the annulus between the casing and tubing) for gas lift construction, based on the accumulated fluid information of the oil and gas well to be constructed. Then, gas is injected into the oil and gas well through the annulus until the actual injection and pressure replenishment parameters reach the determined parameters, at which point the current round of injection and pressure replenishment is paused. Finally, after the current round of injection and pressure replenishment is paused, the accumulated fluid information is reacquired in real time based on the real-time fluid status, and the next round of injection and pressure replenishment is initiated. This invention transforms the traditional continuous gas lift mode into an intermittent, short-term pressure replenishment mode, shortening the gas lift duration for a single well, improving the gas lift efficiency of cluster well groups, and saving on gas lift equipment investment. Simultaneously, this invention reduces the gas injection volume, further saving on gas source and gas lift operating costs.

[0069] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0070] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0071] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0072] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. An air-lift construction method, characterized in that, include: Obtain the fluid accumulation information of the oil and gas well to be constructed, and determine the target gas pressure and target gas internal energy in the annulus required to remove the current fluid accumulation based on the fluid accumulation information, wherein the annulus is located between the casing and the tubing; Gas injection and pressurization are carried out into the oil and gas well to be constructed through the annulus until the actual gas pressure in the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy, at which point the current round of gas injection and pressurization is suspended. After the current round of gas injection and pressurization is paused, the liquid accumulation status is monitored in real time. When the liquid column height in the annulus reaches the preset liquid column height threshold, the liquid accumulation information is reacquired and the next round of gas injection and pressurization is started.

2. The air-lift construction method according to claim 1, characterized in that, The step of determining the target gas pressure in the annulus required to remove the current accumulating liquid based on the accumulating liquid information includes: The target gas pressure is obtained by utilizing the back pressure at the wellhead and the pressure of the fluid accumulated in the tubing.

3. The air-lift construction method according to claim 2, characterized in that, The target gas pressure is calculated using the following expression: P2=P0+ρ L gH2 Where P2 represents the target gas pressure, P0 represents the wellhead back pressure, and ρ L H represents the density of the liquid, g represents the acceleration due to gravity, and H2 represents the height of the liquid column in the tubing.

4. The air-lift construction method according to claim 2 or 3, characterized in that, The step of determining the target gas internal energy in the annulus required to remove the current liquid accumulation based on the liquid accumulation information includes: The internal energy of the target gas is obtained by using the target gas pressure, combined with the bottom hole pressure and the bottom hole gas volume.

5. The air-lift construction method according to claim 4, characterized in that, The internal energy of the target gas is calculated using the following expression: W=0.5(P0+ρ L gH2+P wf )V3 Where W represents the internal energy of the target gas, P0 represents the wellhead back pressure, and ρ L Let H2 represent the density of the accumulated fluid, g represent the acceleration due to gravity, H2 represent the height of the liquid column in the tubing, and P represent the density of the accumulated fluid. wf V3 represents the bottom hole pressure, and V3 represents the bottom hole gas volume.

6. The air-lift construction method according to any one of claims 2 to 5, characterized in that, The air-lift construction method further includes: The bottom hole pressure is obtained by using the back pressure at the wellhead and the pressure of the fluid accumulated in the tubing, combined with the tubing operation parameters and gas injection parameters.

7. The air-lift construction method according to claim 6, characterized in that, The bottom hole pressure is calculated using the following expression: Among them, P wf P0 represents the bottom hole pressure, P0 represents the wellhead back pressure, and ρ represents the bottom hole pressure. L H2 represents the density of the accumulated fluid, g represents the acceleration due to gravity, H2 represents the height of the fluid column in the tubing, and γ represents the density of the accumulated fluid. i The gas density is represented by H, the tubing depth is represented by T. i This indicates the gas injection temperature.

8. The air-lift construction method according to any one of claims 1 to 7, characterized in that, The fluid accumulation information includes, but is not limited to: the height of the fluid column in the annulus, the height of the fluid column in the tubing, and the wellhead back pressure.

9. A computer-readable storage medium, characterized in that, It includes a series of instructions for performing the steps of the air lift construction method as described in any one of claims 1 to 8.

10. An air-lift construction system, characterized in that, The airlift construction system includes the following modules: The parameter determination module is used to acquire the fluid accumulation information of the oil and gas well to be constructed, and to determine the target gas pressure and target gas internal energy in the annulus required to remove the current fluid accumulation based on the fluid accumulation information, wherein the annulus is located between the casing and the tubing; The gas injection and pressure replenishment module is used to inject gas into the oil and gas well to be constructed through the annulus until the actual gas pressure in the annulus reaches the target gas pressure and the actual gas internal energy reaches the target gas internal energy, and then the current round of gas injection and pressure replenishment is paused. The liquid accumulation monitoring module is used to monitor the liquid accumulation status in real time after the current round of gas injection and pressurization is paused, and to reacquire the liquid accumulation information and start the next round of gas injection and pressurization when the liquid column height in the annulus reaches the preset liquid column height threshold.

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