Asynchronous development method and device for gas reservoir with water, storage medium and electronic equipment

Abstract

The invention provides a water-containing gas reservoir asynchronous development method and device, a storage medium and electronic equipment, and the method comprises the following steps: a gas injection step: in the gas reservoir development process, after edge water reaches the bottom of a first row of wells, the first row of wells produce water, the liquid-gas ratio of a gas well is increased, and after the liquid-gas ratio of the first row of wells reaches a preset value, the first row of wells start to transfer CO2 injection, a second row of wells are closed, and the second row of wells are closed; when the formation pressure of the first row of wells recovers to be higher than the preset proportion of the original formation pressure, CO2 injection of the first row of wells is stopped, and the first row of wells are closed; well closing treatment is conducted on the first row of wells for preset days, when the daily recovery pressure of the first row of wells is smaller than a preset pressure value, closing of the first row of wells is finished, and the second row of wells continues to be closed; and a mining step: after the closing of the first row of wells is finished, continuously keeping the first row of wells in a closed state, and simultaneously opening the second row of wells and the third row of wells for gas production. The development method can effectively control water and increase yield, and the final recovery efficiency of the water-containing gas reservoir is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of oil and gas reservoir engineering, and is a CO2 injection water control and energy supplementing method for effectively improving the recovery of gas reservoirs, in particular to an asynchronous development method and device for gas reservoirs with water, a storage medium and an electronic device. BACKGROUND

[0002] In the development process of edge and bottom water gas reservoirs, with the production of natural gas, the formation energy decreases, the pressure of the edge water area gradually becomes higher than that of the gas-bearing area, and the edge water seeps into the gas-bearing area. When the energy difference between the edge water area and the gas-bearing area is too large, the edge water flows along the cracks, high-permeability channels and other dominant channels, and the edge water and natural gas form two-phase flow, that is, water invasion occurs in the gas production well, the water saturation around the well rises sharply, the relative permeability of the gas decreases rapidly, and the flow of natural gas in the matrix pores becomes difficult. At the same time, after the edge water invades, it occupies the high-permeability channels in the reservoir, and traps a large amount of gas through blocking, flow around and water locking, etc., resulting in a significant decrease in gas production rate. Therefore, supplementing energy to the gas-bearing area in time to control the water invasion rate and achieve stable and increased production of natural gas is an important goal in the middle and late stages of the development of edge and bottom water gas reservoirs.

[0003] The common solutions to water invasion in gas reservoirs include adjusting the production system, draining gas and water plugging. Adjusting the production system mainly controls the water invasion rate by reducing the gas well production, but the measures of artificially reducing the gas production will obviously affect the economic benefits of edge and bottom water gas reservoirs; draining gas and water is to produce a large amount of water from the flooded well to consume the edge water energy, thereby improving the ultimate recovery of the gas reservoir, but this method cannot inhibit the water invasion rate and is not suitable for gas reservoirs with sufficient edge water energy; water plugging is to inject chemicals into the gas well to plug the high-permeability channels and delay the edge water channeling, but this method also reduces the flow capacity of the gas and affects the gas well production. Conventional water control technologies are difficult to inhibit water invasion while achieving stable and increased production of gas fields.

[0004] Previous studies have shown that CO2 injection into the reservoir has the theoretical feasibility of inhibiting edge water invasion and improving gas reservoir recovery degree (Sun, Y., Du, Z. M., Sun, L. et al. CO2 sequestration and enhanced natural gas recovery phase behavior. Natural Gas Industry, 2012, 32(5): 39-42). At reservoir temperature and pressure, CO2 is in a supercritical state with low viscosity. After injection into the reservoir, it can flow along the high-permeability channel and occupy the water invasion channel (Gao, Y. C., Zhao, M. F., Wang, J. B. et al. Production characteristics and gas channeling law of CO2 immiscible displacement in ultra-low permeability reservoirs. Petroleum Exploration and Development, 2014, 41(1): 79-85). Moreover, the density of CO2 is between that of natural gas and formation water, and it can be deposited below the natural gas after injection, thereby isolating the edge water and natural gas. At the same time, CO2 injection can increase the pressure of the gas reservoir, reduce the pressure difference between the edge water area and the gas-bearing area, and slow down the edge water invasion rate. Previous numerical simulation studies have shown that after CO2 injection in edge water gas reservoirs, the water saturation of the formation around the gas well decreases, and the water production rate of the gas well slows down (Qiu, W. S. Numerical simulation of CO2 injection for water control in the main gas reservoir of Puguang. World Petroleum Industry, 2020, 27(2): 49-56); in a homogeneous reservoir numerical model, CO2 can displace natural gas, and the displacement front advances relatively smoothly, thereby improving the recovery of natural gas.

[0005] However, the current research on the development method of CO2 injection for water control and recovery improvement in heterogeneous reservoirs of edge water gas reservoirs is not perfect. On the one hand, due to the influence of strong heterogeneity of the reservoir, the injected CO2 is prone to channeling along the high-permeability channel quickly, affecting the water control and gas exchange efficiency; on the other hand, the injection method of CO2 has a great influence on the CO2 sweep efficiency, CO2 gas exchange rate and water control efficiency. How to adopt a development method that can effectively supplement the formation energy and fully utilize the sweep efficiency of injected CO2 to control water and increase gas production is an important technical challenge in the development of gas reservoirs by CO2 injection. SUMMARY

[0006] The purpose of the present application is to provide a CO2 injection and huff and puff development method for the above-mentioned problems, thereby improving the efficiency of CO2 water control and energy supplement.

[0007] To achieve the above-mentioned purpose, in a first aspect, a heterogeneous development method for a water-bearing gas reservoir is provided, which comprises the following steps:

[0008] The gas injection step: during the development of the gas reservoir, when the edge water reaches the bottom of a row of wells, the row of wells produces water, and the liquid-gas ratio of the gas well increases. When the liquid-gas ratio of the row of wells reaches a predetermined value, the row of wells starts to inject CO2, the second row of wells is closed, and when the formation pressure of the row of wells recovers to a predetermined proportion of the original formation pressure, the row of wells stops CO2 injection, and the row of wells is closed;

[0009] The step of closing the well: closing the well for a preset number of days, when the daily pressure recovery of the well is less than a preset pressure value, the well is closed, and the second row of wells is closed;

[0010] The step of production: after the well is closed, the well is kept closed, and the second row of wells and the third row of wells are opened for gas production.

[0011] In some possible embodiments, any one or more of the following is included:

[0012] The preset ratio is 60%-80%;

[0013] The preset number of days is 15-30 days;

[0014] The preset pressure value is 0.1-0.2 MPa;

[0015] The preset value is 1-3 m 3 / 10 4 m 3 ;

[0016] The original formation pressure is 20 MPa to 60 MPa.

[0017] In some possible embodiments, during the whole process of gas reservoir development, when the gas injection well is injecting gas, other wells do not produce gas, and when other wells produce gas, the gas injection well does not inject gas; the gas injection well is a row of wells, and the other wells include the second row of wells and the third row of wells.

[0018] In some possible embodiments, the distance between the row of wells, the second row of wells and the third row of wells and the edge water increases in turn;

[0019] The step of injecting gas specifically includes:

[0020] During the development of the gas reservoir, when the edge water reaches the bottom of the row of wells, the row of wells produces water, and the liquid-gas ratio of the gas well rises, when the wellhead flowmeter detects that the liquid-gas ratio of the row of wells reaches a preset value, the wellhead flowmeter sends a first detection signal to the controller, and the controller controls the row of wells to start injecting CO2 by using the circulating gas injection device according to the first detection signal, and closes the second row of wells, until the wellhead pressure gauge detects that the formation pressure of the row of wells recovers to a preset ratio of the original formation pressure, the wellhead pressure gauge sends a second detection signal to the controller, and the controller controls the circulating gas injection device of the row of wells to stop injecting CO2 according to the second detection signal, and closes the row of wells.

[0021] In a second aspect, a water-bearing gas reservoir development device is provided, which includes:

[0022] The injection module is used for injecting CO2 into the one row of wells when the liquid-gas ratio of the one row of wells rises after the edge water reaches the bottom of the one row of wells, and the one row of wells produces water during the development of the gas reservoir, and stopping the injection of CO2 into the one row of wells and closing the one row of wells when the formation pressure of the one row of wells recovers to a preset proportion of the original formation pressure.

[0023] The well shut-in module is used for carrying out well shut-in treatment on the one row of wells for a preset number of days, and the well shut-in treatment on the one row of wells ends when the daily recovery pressure of the one row of wells is less than a preset pressure value, and the second row of wells is continuously closed.

[0024] The production module is used for keeping the one row of wells closed and opening the second row of wells and the third row of wells for gas production after the well shut-in treatment on the one row of wells ends.

[0025] In some possible implementation manners, any one or more of the following can be included:

[0026] The preset proportion is 60%-80%;

[0027] The preset number of days is 15-30 days;

[0028] The preset pressure value is 0.1-0.2 MPa;

[0029] The preset value is 1-3 m 3 / 10 4 m 3 ;

[0030] The original formation pressure is 20 MPa to 60 MPa.

[0031] In some possible implementation manners, during the whole development of the gas reservoir, the injection of gas into the injection well is kept when other wells do not produce gas, and the injection well does not inject gas when the other wells produce gas; the injection well is the one row of wells, and the other wells include the second row of wells and the third row of wells.

[0032] In some possible implementation manners, the distances of the one row of wells, the second row of wells and the third row of wells from the edge water increase in turn;

[0033] The injection module comprises:

[0034] The wellhead flowmeter is used for sending a first detection signal to the controller when it is detected that the liquid-gas ratio of the one row of wells reaches a preset value after the liquid-gas ratio of the one row of wells rises after the edge water reaches the bottom of the one row of wells, and the one row of wells produces water during the development of the gas reservoir.

[0035] The controller is used for controlling the one row of wells to start injecting CO2 by using the cyclic gas injection device and closing the second row of wells according to the first detection signal.

[0036] a wellhead pressure gauge configured to send a second detection signal to the controller when detecting that the formation pressure of the well cluster is restored to a preset proportion of the original formation pressure;

[0037] the controller is further configured to control the cyclic gas injection device of the well cluster to stop CO2 injection and shut down the well cluster according to the second detection signal.

[0038] In a third aspect, an electronic device is provided, comprising:

[0039] one or more processors;

[0040] a storage device configured to store one or more programs, when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the methods for developing a watered gas reservoir asynchronously as described above.

[0041] In a fourth aspect, a computer readable medium is provided, which stores a computer program, when the program is executed by a processor, the method for developing a watered gas reservoir asynchronously as described above is implemented.

[0042] The above technical solution has the following beneficial technical effects:

[0043] The embodiment of the present application provides a method for developing a watered gas reservoir by injecting CO2 to improve recovery efficiency, which uses CO2 as injection gas to effectively delay water invasion into a gas well while improving formation pressure, and proposes a method of injecting first and then plugging, and then developing asynchronously, which can effectively control water and increase production, improve the ultimate recovery efficiency of the watered gas reservoir, and provide technical support for gas control and water control in the middle and late stages of the watered gas reservoir development. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a flow chart of the method for developing a watered gas reservoir asynchronously according to the embodiment of the present application;

[0045] Figure 2 is a flow chart of the method for developing a watered gas reservoir asynchronously according to the embodiment of the present application;

[0046] Figure 3 is a schematic diagram of step one (injection) according to the embodiment of the present application;

[0047] Figure 4 is a schematic diagram of step two (plugging) according to the embodiment of the present application;

[0048] Figure 5 is a schematic diagram of step three (production) according to the embodiment of the present application;

[0049] Figure 6 is a comparison of daily natural gas production of different CO2 injection development methods of Example 1 of the embodiment of the present application;

[0050] Figure 7 is a comparison of cumulative natural gas production of different CO2 injection development methods of Example 1 of the embodiment of the present application;

[0051] Figure 8 is a gas saturation field map of Example 1 of the embodiment of the present application, and the CO2 injection is converted to effectively push the edge water back and inhibit water invasion.

[0052] Figure 9 is a comparison of daily natural gas production of different CO2 injection methods of Example 2 of the embodiment of the present application;

[0053] Figure 10 is a comparison of daily water production of different CO2 injection methods of Example 2 of the embodiment of the present application;

[0054] Figure 11 is a water saturation field map of Example 2 of the embodiment of the present application, and the CO2 injection is converted to effectively push the edge water back and inhibit water invasion.

[0055] Figure 12 is a functional block diagram of the watered gas reservoir asynchronous development device of the embodiment of the present application;

[0056] Figure 13 is a functional block diagram of the electronic device of the embodiment of the present application. DETAILED DESCRIPTION

[0057] The embodiment of the present application provides a CO2 injection type watered gas reservoir recovery improvement development method, which is an asynchronous injection-muting-production method, and provides theoretical guidance for researching a multi-well coordinated injection-production system optimization in the middle and late stages of watered gas reservoir development, so as to have the functions of energy supplementing, water control, gas increasing and carbon recycling.

[0058] Embodiment One

[0059] As shown in Figure 1 , the embodiment of the present application provides a watered gas reservoir asynchronous development method, which comprises the following steps:

[0060] S1, a gas injection step: in the development process of the gas reservoir, when the edge water reaches the bottom of a well, the well produces water, and the liquid-gas ratio of the gas well rises, when the liquid-gas ratio of the well reaches a preset value, the well starts to inject CO2, and the second well is closed, until the formation pressure of the well recovers to a preset proportion of the original formation pressure, the well stops CO2 injection, and the well is closed;

[0061] Specifically, in some embodiments, the step specifically comprises:

[0062] In the gas reservoir development process, when the edge water reaches the bottom of a well in a row, the well in the row produces water, and the liquid-gas ratio of the gas well rises. When the wellhead flowmeter detects that the liquid-gas ratio of the well in the row reaches a preset value of the liquid-gas ratio, the wellhead flowmeter sends a first detection signal to the controller, and the controller controls the well in the row to start injecting CO2 by using a (smart) cyclic gas injection device and closes the well in the second row until the wellhead pressure gauge detects that the formation pressure of the well in the row is restored to a preset proportion of the original formation pressure or more, and the wellhead pressure gauge sends a second detection signal to the controller, and the controller controls the (smart) cyclic gas injection device of the well in the row to stop injecting CO2, and closes the well in the row.

[0063] S2, huff and puff step: the well in the row is subjected to huff and puff treatment for a preset number of days, when the daily recovery pressure of the well in the row is less than a preset pressure value, the huff and puff of the well in the row is ended, and the well in the second row is continued to be closed;

[0064] S3, production step: after the huff and puff of the well in the row is ended, the well in the row is continued to be kept in a closed state, and the well in the second row and the well in the third row are opened for gas production.

[0065] In some embodiments, including any one or more of the following: the preset proportion is 60%-80%, preferably 65%; the preset number of days is 15-30 days; the preset pressure value is 0.1-0.2 MPa; the preset liquid-gas ratio value is 1-3 m 3 / 10 4 m 3 , preferably 2 m 3 / 104m 3 ; the original formation pressure is 20 MPa to 56 MPa, preferably 56 MPa.

[0066] In some embodiments, during the whole process of gas reservoir development, the other wells do not produce gas when the injection well injects gas, and the injection well does not inject gas when the other wells produce gas; the injection well is a well in a row, and the other wells include the well in the second row and the well in the third row.

[0067] In some embodiments, the distance of the well in the row, the well in the second row and the well in the third row from the edge water increases in turn.

[0068] The application provides a CO2 injection huff and puff and asynchronous gas production development method, so as to facilitate the improvement of the CO2 water control and energy supplement efficiency.

[0069] Embodiment two

[0070] The method for improving the recovery ratio of a water-bearing gas reservoir by injecting CO2 in the embodiment of the present application relates to a multi-well row development method for a gas reservoir with edge water, defines a well closest to the edge water as a row well, a well second closest to the edge water as a two-row well, and so on, and a flow chart thereof is shown in Figure 2 An asynchronous "injection-muting-production" CO2 injection method for improving the recovery ratio of a gas reservoir, the method comprising the following steps:

[0071] Step one (injection): as development proceeds, when the edge water reaches the bottom of the row well, the row well produces water, and the liquid-gas ratio of the gas well rises; when the liquid-gas ratio of the row well reaches a preset value, the row well starts to inject CO2, and the two-row well is closed (see Figure 3 ) until the formation pressure recovers to more than 65% of the original formation pressure (Pr), the CO2 injection is stopped, and the row well is closed.

[0072] Step two (muting): the row well is muted, and the pressure is recovered; when the daily recovery pressure is less than 0.2 MPa, the muting is ended, and the two-row well continues to be closed (see Figure 4 ).

[0073] Step three (production): the row well continues to be closed, and the two-row well and the three-row well are opened for production (see Figure 5 ).

[0074] Throughout the whole process, the other wells (two-row well and three-row well) are not produced when the gas injection well (row well) is injecting gas, and the gas injection well is not injecting gas when the other wells are producing, that is, "not producing when injecting, and not injecting when producing".

[0075] The embodiment of the present application proposes an asynchronous "injection-muting-production" CO2 injection method for improving the recovery ratio of a water-bearing gas reservoir, which uses CO2 as the injected gas, and can effectively delay the water invasion into the gas well while improving the formation pressure; in view of the problem that the injected CO2 is prone to gas channeling under a high injection-production pressure difference, resulting in a low sweep efficiency, a method of injecting first and muting later, and then producing asynchronously is proposed, which can effectively control water and increase production, improve the ultimate recovery ratio of the water-bearing gas reservoir, and provide technical support for gas stabilization and water control in the middle and late stages of the development of the water-bearing gas reservoir.

[0076] Example 1

[0077] This example takes a typical edge water gas field mechanism model as an example, and the row well is developed by injecting CO2 after water flooding, the original formation pressure of the gas reservoir is 20 MPa, and the specific implementation of the present application is described according to the flow chart shown in Figure 2 .

[0078] As development proceeds, the water-gas ratio of the row well reaches 2 m 3 / 10 4 m 3At that time, wells W1 in the first row and well W2 in the second row were shut down, and CO2 injection was simulated in well W1. When the formation pressure in the well control area of ​​well W1 reached 13 MPa, CO2 injection was stopped, and well W1 was shut down and kept in a closed state for 15 days before well W2 was reopened for production. This asynchronous "inject-close-produce" development method has development indicators compared to depletion production and CO2 displacement production (injection and production in the first and second rows simultaneously). Figure 6 , Figure 7 As shown. By Figure 6 , Figure 7 It can be seen that, compared with depletion mining and CO2 displacement mining (where primary and secondary injection and production are carried out simultaneously), the asynchronous "injection-suffocation-production" CO2 injection development method can effectively extend production time, achieve better production capacity, and at the same time achieve better water control (see [reference]). Figure 8 This can effectively improve the final recovery rate of gas fields.

[0079] Example 2

[0080] This example uses the P-side water-gas field as a case study, where a row of wells underwent severe water flooding followed by CO2 injection. The original formation pressure of the gas reservoir was 56 MPa. According to... Figure 2 The process shown illustrates the specific implementation of the present invention.

[0081] As development progresses, the water-to-gas ratio of one row of wells reaches 2m. 3 / 10 4 m 3 During this period, all gas wells in the block were temporarily shut down, and CO2 injection was simulated in the first row of wells. When the formation pressure in the well control area of ​​the first row of wells reached 38 MPa, CO2 injection was stopped, and the first row of wells remained shut down for 15 days before the second and third rows of wells were reopened for production. It is worth noting that, to maximize CO2 utilization and ensure effective CO2 reach to the gas areas of the second and third rows of wells, the first row of wells, which experienced water flooding, remained shut down after CO2 injection. This asynchronous "inject-shut-produce" development method is compared with the development indicators of three other development methods: exhaustion production, CO2 displacement production (injection and production of the first and second rows simultaneously), and asynchronous injection and production (injection in the first row first, followed by production in the second row). Figure 9 , Figure 10 As shown. By Figure 9 , Figure 10 It can be seen that, compared with the three development methods of depletion mining, CO2 displacement mining (simultaneous injection and production in the first and second rows), and asynchronous injection and production (injection in the first row first, followed by production in the second row), the asynchronous "injection-suffocation-production" CO2 injection development method can significantly delay gas channeling, extend production time, and has better production capacity. It can also delay edge water encroachment to a certain extent. Figure 11 It simultaneously replenishes energy, increases qi, and delays water intrusion.

[0082] Example 3

[0083] As Figure 12 shown in the accompanying drawings, the embodiments of the present application provide a water gas reservoir development device, which comprises:

[0084] a gas injection module 110, configured to, during gas reservoir development, when the edge water reaches the bottom of a row of wells, the row of wells produces water, the liquid-gas ratio of the gas well rises, when the liquid-gas ratio of the row of wells reaches a preset value, the row of wells starts to inject CO2, the second row of wells is closed, and when the formation pressure of the row of wells recovers to a preset proportion of the original formation pressure, the row of wells stops CO2 injection, and the row of wells is closed;

[0085] a well shut-in module 120, configured to perform well shut-in processing on the row of wells for a preset number of days, when the daily recovery pressure of the row of wells is less than a preset pressure value, the well shut-in of the row of wells ends, and the second row of wells continues to be closed;

[0086] a production module 130, configured to, after the well shut-in of the row of wells ends, continue to keep the row of wells closed, and open the second row of wells and the third row of wells for gas production.

[0087] Specifically, in some embodiments, the gas injection module 110 comprises:

[0088] a wellhead flow meter, configured to, during gas reservoir development, when the edge water reaches the bottom of a row of wells, the row of wells produces water, the liquid-gas ratio of the gas well rises, when it is detected that the liquid-gas ratio of the row of wells reaches a preset value, a first detection signal is sent to a controller;

[0089] a controller, configured to, according to the first detection signal, control the row of wells to start to inject CO2 by using a (smart) cyclic gas injection device, and close the second row of wells;

[0090] a wellhead pressure gauge, configured to, when it is detected that the formation pressure of the row of wells recovers to a preset proportion of the original formation pressure, a second detection signal is sent to the controller;

[0091] the controller is further configured to, according to the second detection signal, control the (smart) cyclic gas injection device of the row of wells to stop CO2 injection, and close the row of wells.

[0092] In some embodiments, any one or more of the following is included: the preset proportion is 60%-80%, preferably 65%; the preset number of days is 15-30 days; the preset pressure value is 0.1-0.2 MPa; the preset value of the liquid-gas ratio is 1-3 m 3 / 10 4 m 3 , preferably 2 m 3 / 10 4 m 3The original formation pressure is 20 MPa to 60 MPa, preferably 56 MPa.

[0093] In some embodiments, throughout the entire process of gas reservoir development, the injection wells are kept in a state where other wells do not produce gas while the injection wells are producing gas, and the injection wells are kept in a state where other wells are producing gas while the injection wells are not producing gas; the injection wells are a row of wells, and the other wells include the second row of wells and the third row of wells.

[0094] In some embodiments, the distances of the first row of wells, the second row of wells, and the third row of wells from the edge water increase sequentially.

[0095] This invention proposes an asynchronous "inject-smother-production" CO2 injection development device to enhance the recovery rate of water-bearing gas reservoirs. This device uses CO2 as the injection gas, which can effectively delay the intrusion of formation water into the gas well while increasing formation pressure. In addition, to address the problem that injected CO2 is prone to gas channeling under high injection-production pressure differential, resulting in low sweep efficiency, a device is proposed that first inject, then smother, and then asynchronously produce. This development device can effectively control water and increase production, improve the final recovery rate of water-bearing gas reservoirs, and provide technical support for stabilizing gas and controlling water in the middle and late stages of water-bearing gas reservoir development.

[0096] Example 4

[0097] The following is for reference. Figure 13 This document illustrates an electronic device suitable for implementing embodiments of the present disclosure. Terminal devices in embodiments of the present disclosure may include, but are not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Flat-panel Displays), PMPs (Portable Multimedia Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 9 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments disclosed herein. Figure 9As shown, the electronic device can include a processing device (e.g., a central processor, a graphics processor, etc.) 201 that can perform various appropriate actions and processes according to programs stored in a Read-Only Memory (ROM) 202 or loaded from a storage device 208 into a Random Access Memory (RAM) 203. Various programs and data required for operation of the electronic device are also stored in the RAM 203. The processing device 201, the ROM 202, and the RAM 203 are connected to each other through a bus 204. An Input / Output (I / O) interface 205 is also connected to the bus 204. Generally, the following devices can be connected to the I / O interface 205: input devices 206 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 207 including, for example, a Liquid Crystal Display (LCD), a speaker, a vibrator, etc.; storage devices 208 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 209. The communication devices 209 can allow the electronic device to communicate wirelessly or wired with other devices to exchange data. Although not shown, the electronic device can further include a power supply device, a power management device, etc. Figure 9 An electronic device having various devices is shown, but it is understood that all of the shown devices are not required to be implemented or present. More or less devices can alternatively be implemented or present. In particular, processes described above with reference to flowcharts can be implemented as computer software programs according to embodiments of the present disclosure.

[0098] For example, embodiments of the present disclosure include a computer program product including a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network through the communication device 309, or installed from the storage device 308, or installed from the ROM 302. When the computer program is executed by the processing device 301, the above-mentioned functions defined in the methods of embodiments of the present disclosure are performed. It is noted that the above-mentioned computer-readable medium of the present disclosure can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. The computer-readable storage medium may, for example, be but is not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any combination of the above.

[0099] Embodiment Five

[0100] More specific examples of the computer-readable storage medium in this embodiment can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any appropriate combination of the foregoing. In this disclosure, the computer-readable storage medium can be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium can include a computer-readable storage medium in baseband or propagated as a carrier wave in a propagated data signal, which can contain computer-readable program code. The propagated data signal can take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium that is not a computer-readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code contained in a computer-readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire line, optical fiber cable, RF, etc., or any suitable combination of the foregoing. In some embodiments, the client, server, or both can communicate using any known or future developed network protocols, such as HTTP (HyperText Transfer Protocol), and can be interconnected with any form or medium of digital data communication (e.g., a communication network) and can communicate over such network using computer-readable instructions. Examples of communication networks include local area networks ("LAN"), wide area networks ("WAN"), inter-networks (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed networks.

[0101] The computer-readable medium described above can be included in the electronic device described above; or can exist separately from the electronic device and can be accessed via the electronic device.

[0102] The computer-readable medium described above stores one or more programs, which, when executed by the electronic device, cause the electronic device to perform the following steps:

[0103] The gas injection step: in the development process of the gas reservoir, when the edge water reaches the bottom of a row of wells, the row of wells produces water, and the liquid-gas ratio of the gas well rises. When the liquid-gas ratio of the row of wells reaches a predetermined value, the row of wells starts to inject CO2, the second row of wells is closed, and the row of wells stops CO2 injection when the formation pressure of the row of wells recovers to a predetermined proportion of the original formation pressure, and the row of wells is closed;

[0104] The well shut-in step: the one-row well is subjected to a preset number of days of well shut-in treatment, when the daily pressure recovery of the one-row well is less than a preset pressure value, the well shut-in of the one-row well is ended, and the two-row well continues to be closed;

[0105] The production step: after the well shut-in of the one-row well is ended, the one-row well continues to be closed, and the two-row well and the three-row well are opened for gas production.

[0106] Computer program code for carrying out operations of the present disclosure can be written in one or more programming languages or combinations of languages including object oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0107] The flowcharts and block diagrams in the attached drawings illustrate the possible implementation architectures, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in different orders than that shown in the attached drawings. For example, two blocks that are shown in succession can actually be executed substantially in parallel, or they can be executed in reverse order, depending on the involved functions. It should also be noted that each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0108] The units involved in the embodiments of the present disclosure can be implemented in a software manner or in a hardware manner. In some cases, the name of the unit does not constitute a limitation on the unit itself.

[0109] The functionality described above in this document can be performed, at least in part, by one or more hardware logic components. For example, and without limitation, non- transitory machine-readable media can include RAM, ROM, programmable ROM (EPROM, EEPROM or flash memory), or any other storage device(s) through which program instructions can be stored and executed by a processing unit. The above described functions can be implemented as software modules or software functions using object-oriented programming techniques (e.g., C++). The software modules or functions can be stored on one or more of the respective storage devices, in the RAM, or elsewhere by a processor executing at a device as instructions stored in non-transitory machine-readable media.

[0110] In the context of the present disclosure, a machine-readable medium can be a tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium will include one or more lines of a processor, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0111] The above description is only preferred embodiments of the present disclosure and the explanation of the applied technical principles. It should be understood by those skilled in the art that the disclosure range involved in the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or equivalent features without departing from the above disclosed concept. For example, the technical solutions formed by replacing the above features with the technical features disclosed in the present disclosure (but not limited to) having similar functions.

[0112] Furthermore, while operations are depicted in a particular order, this should not be understood as requiring this particular order or sequential order of execution. In certain circumstances, multitasking and parallel processing can be advantageous. Likewise, while a number of specific implementation details have been discussed, these should not be construed as limiting the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination. Conversely, various features that are described in the context of a single embodiment can also be implemented or practiced separately or in any suitable subcombination.

[0113] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method for the asynchronous development of a water-bearing gas reservoir, characterized in that, The method comprises the following steps: The injection step: in the development process of the gas reservoir, when the edge water reaches the bottom of a row of wells, the row of wells produces water, and the liquid-gas ratio of the gas well rises; when the liquid-gas ratio of the row of wells reaches a preset value, the row of wells starts to inject CO2, and the second row of wells is closed until the formation pressure of the row of wells recovers to a preset proportion of the original formation pressure, the row of wells stops CO2 injection, and the row of wells is closed; The well shut-in step: the row of wells is subjected to well shut-in treatment for a preset number of days; when the daily pressure recovery of the row of wells is less than a preset pressure value, the well shut-in of the row of wells ends, and the second row of wells continues to be closed; The production step: after the well shut-in of the row of wells ends, the row of wells continues to be closed, and the second row of wells and the third row of wells are opened for gas production.

2. The method of claim 1, wherein the preset proportion is 60%-80%; the preset number of days is 15-30 days; the preset pressure value is 0.1-0.2 MPa; and the original formation pressure is 20-60 MPa. In the whole development process of the gas reservoir, the injection well is kept injecting gas while other wells are not producing gas, and the injection well is kept not injecting gas while other wells are producing gas; the injection well is a row of wells, and the other wells include the second row of wells and the third row of wells. The distance of the row of wells, the second row of wells and the third row of wells from the edge water increases in turn; The injection step specifically comprises: The preset value is 1-3m 3 / 10 4 m 3 ; In the development process of the gas reservoir, when the edge water reaches the bottom of a row of wells, the row of wells produces water, and the liquid-gas ratio of the gas well rises; when the wellhead flowmeter detects that the liquid-gas ratio of the row of wells reaches a preset value, the wellhead flowmeter sends a first detection signal to a controller, the controller controls the row of wells to start to inject CO2 by using a cyclic gas injection device according to the first detection signal, and the second row of wells is closed until the wellhead pressure gauge detects that the formation pressure of the row of wells recovers to a preset proportion of the original formation pressure, the wellhead pressure gauge sends a second detection signal to the controller, and the controller controls the cyclic gas injection device of the row of wells to stop CO2 injection according to the second detection signal, and the row of wells is closed.

3. The method of claim 1, wherein, It comprises:

4. The method of claim 1, wherein, An injection module, which is used for injecting CO2 in the development process of the gas reservoir, when the edge water reaches the bottom of a row of wells, the row of wells produces water, and the liquid-gas ratio of the gas well rises; when the liquid-gas ratio of the row of wells reaches a preset value, the row of wells starts to inject CO2, and the second row of wells is closed until the formation pressure of the row of wells recovers to a preset proportion of the original formation pressure, the row of wells stops CO2 injection, and the row of wells is closed; A well shut-in module, which is used for subjecting the row of wells to well shut-in treatment for a preset number of days; when the daily pressure recovery of the row of wells is less than a preset pressure value, the well shut-in of the row of wells ends, and the second row of wells continues to be closed; A production module, which is used for keeping the row of wells closed after the well shut-in of the row of wells ends, and opening the second row of wells and the third row of wells for gas production.

5. An apparatus for developing a water gas reservoir, characterized by 6. The device of claim 5, wherein the preset proportion is 60%-80%; and the preset number of days is 15-30 days. ​ ​ ​ ​ ​ ​ The preset pressure value is 0.1-0.2 MPa; The preset value is 1-3 m3 / 10 4 m 3 ; The original formation pressure is 20-60 MPa.

7. The apparatus of claim 5, wherein, In the whole process of gas reservoir development, the injection well is kept from injecting gas when other wells are producing gas, and the injection well is kept from injecting gas when other wells are injecting gas; the injection well is a row of wells, and the other wells include the second row of wells and the third row of wells.

8. The apparatus of claim 5, wherein, The distance between the first row of wells, the second row of wells and the third row of wells and the edge water increases in turn; The injection module comprises: A wellhead flowmeter is used to detect the liquid-gas ratio of the first row of wells when the edge water reaches the bottom of the first row of wells during the development of the gas reservoir, and the liquid-gas ratio of the gas well rises; when the liquid-gas ratio of the first row of wells reaches a preset value, a first detection signal is sent to the controller; The controller is used to control the first row of wells to start injecting CO2 by using the cyclic gas injection device and to close the second row of wells according to the first detection signal; A wellhead pressure gauge is used to send a second detection signal to the controller when the formation pressure of the first row of wells is restored to a preset proportion of the original formation pressure or above; The controller is also used to control the cyclic gas injection device of the first row of wells to stop injecting CO2 and to close the first row of wells according to the second detection signal. 9.An electronic device, comprising: one or more processors; a storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, the one or more processors implement the method for developing a water-bearing gas reservoir asynchronously according to any one of claims 1-4. 10.A computer readable medium having stored thereon a computer program which, when executed by a processor, implements the method for developing a water-bearing gas reservoir asynchronously according to any one of claims 1-4.

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