A method, electronic device, and medium for implementing deployment of a gas reservoir drainage well

Abstract

This invention discloses a method, electronic equipment, and medium for deploying drainage wells in a gas reservoir. Belonging to the field of oil and gas extraction technology, the method includes determining the reservoir water intrusion pattern and channels, calculating the cumulative water intrusion volume, and calculating the daily water intrusion volume based on the cumulative water intrusion volume. Based on the daily water intrusion volume, the total drainage volume of the gas reservoir is determined, and the total drainage volume of existing wells is determined accordingly. The gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of existing wells; the gap drainage volume is the drainage volume of new wells that need to be deployed to supplement the existing drainage volume; the well type, drainage volume, and number of new wells are determined according to the required drainage volume; and the well trajectory orientation, plane position, vertical position, and length of the new wells are set. This method enables new wells to work collaboratively with existing wells, effectively improving the utilization rate of gas reservoir reserves, reducing abandonment pressure, and ultimately significantly improving the gas reservoir recovery rate, allowing gas reservoir development to maintain a highly efficient and stable state for a longer period.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas extraction technology, specifically relating to a method, electronic equipment, and medium for deploying gas reservoir drainage wells. Background Technology

[0002] The Kuqa Depression in the Tarim Basin holds a pivotal position in my country's natural gas resources sector, and the development of its water-bearing gas reservoirs in sandstone and fractured sandstone has attracted considerable attention. However, a series of complex and challenging issues have gradually emerged during the development process.

[0003] Non-uniform water intrusion is extremely pronounced, resulting from the combined effects of formation heterogeneity and the irregular distribution of fracture systems. Differences in lithology and pore structure across different regions of the formation cause water to advance unevenly during gas reservoir intrusion. Fracture-induced water channeling further complicates development; fractures, acting as highly permeable conduits, provide rapid pathways for formation water to flow, allowing it to spread quickly within the gas reservoir and severely disrupting normal natural gas extraction.

[0004] Along with these water intrusion problems, the utilization rate of reserves is showing a downward trend. Large amounts of natural gas are difficult to extract effectively due to water blockage or occupying storage space, and reservoirs that originally had development potential are gradually losing their due development value. At the same time, the abandonment pressure is constantly increasing, which means that in the later stages of extraction, higher pressure drive is required to maintain gas well production. This not only increases extraction costs but also reduces the overall recovery rate of the gas reservoir. Therefore, it is urgent to formulate policies to improve the recovery rate of water-bearing gas reservoirs.

[0005] Currently, gas reservoir extraction methods are relatively scarce, and drainage production has become the dominant approach. In this context, in-depth research into how to conduct targeted, efficient, and systematic drainage production operations is crucial. By comprehensively and meticulously analyzing existing data, including geological characteristics, fluid distribution patterns, and production dynamics of water-bearing gas reservoirs in the Kuqa Depression sandstone and fractured sandstone, key information such as water intrusion channels, water intrusion volume, and changes in the reservoir's pressure system can be accurately determined. This allows for the design of site-specific drainage production schemes, providing valuable reference for the development of similar gas reservoirs and offering a method for deploying drainage wells in gas reservoirs. Summary of the Invention

[0006] The purpose of this invention is to provide a method, electronic equipment, and medium for improving the recovery rate of water-bearing gas reservoirs, in order to overcome the shortcomings of existing technologies in water-bearing gas reservoirs, which are characterized by a gradual increase in the number of water-bearing wells and a low recovery rate due to the intensified influence of water intrusion.

[0007] On one hand, the present invention provides a method for deploying a gas reservoir drainage well, comprising the following steps: Determine the water intrusion pattern and channels in the gas reservoir and calculate the cumulative water intrusion volume. Based on the cumulative water intrusion volume, calculate the daily water intrusion volume. The total drainage volume of the gas reservoir is determined based on the daily water intrusion, and the total drainage volume of the old well is determined based on the actual production situation of the old well. The gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of the old wells. The gap drainage volume is the drainage volume of the new wells that need to be deployed to supplement the drainage volume. The type, drainage volume, and quantity of new wells are determined based on the required drainage volume of new wells to be deployed; and the orientation, planar position, vertical position, and length of the well trajectory are set.

[0008] Furthermore, the specific steps for determining the gas reservoir water intrusion model and water intrusion channels, and calculating the daily water intrusion volume are as follows: Based on the gas and water production data recorded during the development process, the measured formation pressure data, and the necessary fluid analysis data, the cumulative water intrusion of the gas reservoir at two specific moments is calculated using the apparent geological reserves method and the apparent pressure method. The daily water intrusion is calculated based on the difference between the cumulative water intrusion at two different times.

[0009] Furthermore, the apparent geological reserves method is based on the material balance equation of abnormally high-pressure gas reservoirs, and the daily water intrusion calculation formula can be obtained through formula (1): (1) in, W e To calculate the cumulative water intrusion volume, B g B is the natural gas volume factor. gi C is the natural gas volume factor under the original formation pressure. e Let ΔP be the combined compressibility coefficient of the fluid and rock, ΔP be the average pressure drop of the gas reservoir, and ΔG = G. P -G, G P G represents the original reserves of natural gas, which is considered as geological reserves.

[0010] Furthermore, the apparent pressure method is based on the material balance equation of an abnormally high-pressure gas reservoir, and the formula for calculating daily water intrusion can be obtained through formula (2). (2) Among them, W e To calculate the cumulative water intrusion volume, W p For cumulative water production, B w The formation water volume factor is... Let p be the pressure difference between the original gas reservoir and the current gas reservoir, Z be the deviation factor of natural gas, G be the original natural gas reserves, and B be the pressure difference between the original gas reservoir and the current gas reservoir pressure. gi This represents the natural gas volume factor under the original formation pressure.

[0011] Furthermore, the material balance equation for the abnormally high-pressure gas reservoir is Equation (3). (3); in, To accumulate gas production, B g B is the natural gas volume factor. gi This represents the natural gas volume factor under the original formation pressure. W p For the cumulative water production, B w S is the formation water volume factor, G is the original natural gas reserves, and S is the formation water volume factor. wi C represents the initial water saturation level. w C is the formation water volume compressibility coefficient. f The volume compressibility coefficient of the rock. Where W is the original gas reservoir pressure, p is the gas reservoir pressure, and W is the gas reservoir pressure. e This represents the cumulative amount of water intrusion. Furthermore, the total drainage volume of the gas reservoir is determined based on the daily water intrusion, and the specific total drainage volume of the old wells is determined based on the actual production situation of the old wells as follows: Determination of total gas reservoir drainage: The total gas reservoir drainage is determined by combining numerical simulation, surface support, and economic evaluation, and the total gas reservoir drainage is less than or equal to the daily water intrusion (the total gas reservoir drainage should be as close as possible to the daily water intrusion). Determining the total drainage volume of old wells: Prioritize the drainage of flooded wells on the advantageous channels, and determine the drainage volume of each well based on production dynamics and renovation status. The sum of the drainage volumes of all individual wells is the total drainage volume of old wells.

[0012] Furthermore, the gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of the old wells. The gap drainage volume is the drainage volume of the new wells that need to be deployed to supplement the existing drainage volume. Specifically: Determining the gap drainage volume: Gap drainage volume = Total drainage volume of gas reservoir - Total drainage volume of old well.

[0013] Furthermore, based on the required drainage volume of the new wells, the well type, drainage capacity, and quantity are determined; and the specific details of the well trajectory orientation, horizontal position, vertical position, and length are set as follows: The new well type is either a highly deviated well or a horizontal well; The well trajectory orientation maintains wellbore stability and drills through multiple main water intrusion channels; The well trajectory is positioned at the water intrusion front; The vertical position of the well trajectory is used to select the location of the dominant water intrusion channel or the gas production point of an adjacent gas well; The length of the well trajectory is the length of the passage through more water intrusion channels.

[0014] In a second aspect, the present invention provides an electronic device, the electronic device comprising: Memory, which stores executable instructions; A processor that executes the executable instructions in the memory to implement a method for deploying a gas reservoir drainage well.

[0015] Thirdly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a method for deploying a gas reservoir drainage well.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a method for deploying drainage wells in a gas reservoir. The method involves determining the reservoir's water intrusion pattern and channels, calculating the cumulative water intrusion volume, and then calculating the daily water intrusion volume based on the cumulative volume. The total drainage volume of the gas reservoir is determined based on the daily water intrusion volume, along with the total drainage volume of existing wells. A gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of existing wells; this gap drainage volume is the drainage volume of new wells that need to be deployed to supplement the existing drainage volume. The well type, drainage volume, and number of new wells are determined according to the required drainage volume. The well trajectory orientation, planar position, vertical position, and length of the new wells are also set. This allows the new wells to work collaboratively with existing wells, effectively improving the utilization rate of the gas reservoir's reserves, reducing abandonment pressure, and ultimately significantly improving the gas reservoir's recovery rate, enabling the gas reservoir development to maintain a highly efficient and stable state over a longer period.

[0017] Specifically, the new well adopts a highly deviated or horizontal well design, which increases the contact area between the wellbore and the reservoir, improving the natural gas drainage capacity. The well trajectory orientation is designed to balance wellbore stability and penetration through multiple major water intrusion channels, effectively intercepting and controlling water intrusion paths and reducing the impact of water on the main gas reservoir. The well trajectory is deployed at the water intrusion front, enabling early intervention before water extensively invades the core area of ​​the gas reservoir. The vertical position of the well trajectory is selected at advantageous water intrusion channel locations or adjacent gas well production points, further optimizing the gas production and water control effects of the new well. The well trajectory length traverses more water intrusion channels, maximizing the water control and gas production effects of the new well. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a method for deploying a gas reservoir drainage well according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of two dominant water intrusion channels in gas reservoir A in Embodiment 1 of the present invention.

[0020] Figure 3 This is a schematic diagram of the two dominant water intrusion channels in the western part of gas reservoir A in Embodiment 1 of the present invention.

[0021] Figure 4This is a schematic diagram of a typical cumulative water intrusion curve using the apparent geological reserves method in Embodiment 1 of the present invention.

[0022] Figure 5 This is a schematic diagram of a typical cumulative water intrusion curve using the apparent pressure method in Embodiment 1 of the present invention.

[0023] Figure 6 This is a schematic diagram illustrating the deployment in Embodiment 2 of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] Example 1 Systematic drainage and gas production studies are conducted on water-bearing gas reservoirs to effectively improve reservoir recovery rates. This study takes a fractured water-bearing gas reservoir, A, as an example, and demonstrates how systematic drainage and gas production, along with the optimization and design of drainage wells and drainage volumes, can enhance reservoir recovery.

[0027] See Figures 1 to 3 First, by combining static and dynamic data, the water intrusion pattern and channels of the gas reservoir were identified, and the cumulative water intrusion volume was calculated. Based on the cumulative water intrusion volume, the daily water intrusion volume was calculated. Specifically, by combining seismic data, gas production profile testing, pressure recovery, interference testing, tracer analysis, chloride analysis, water analysis radar charts, and production characteristics of single wells and well groups, the characteristics of water-bearing wells were derived: 1. Secondary faults are developed around the wells, and new water-bearing wells are successively added from west to east near the same fault; 2. Water intrusion exhibits the characteristics of multiple water channels, which advance rapidly along the same water channel, and there are differences between the water channels.

[0028] The water-bearing time of the seven wells is related to their distance from the western edge of the water. The water-bearing rise types include slow rise and rapid water flooding, reflecting that the gas reservoir has multiple water invasion mechanisms, including complex water invasion and fault water channeling. The western part shows the complex characteristics of two main directions and multiple main water invasion paths.

[0029] The urgency of water intrusion has increased, with the water intrusion front reaching the Keshen 8-5 well, close to the middle of the gas reservoir. The structural amplitude of the pure gas zone in the eastern main area is only over 200 meters, and the water body has already threatened the main gas reservoir area.

[0030] Based on the material balance equation formula (3) for abnormally high-pressure gas reservoirs, and according to the gas and water production data recorded during the development process, the measured formation pressure data, and the necessary fluid analysis data, the cumulative water intrusion of the gas reservoir at two certain moments is calculated using the apparent geological reserves method and the apparent pressure method.

[0031] (3); in, To accumulate gas production, B g B is the natural gas volume factor. gi This represents the natural gas volume factor under the original formation pressure. W p For the cumulative water production, B w S is the formation water volume factor, G is the original natural gas reserves, and S is the formation water volume factor. wi C represents the initial water saturation level. w C is the formation water volume compressibility coefficient. f The volume compressibility coefficient of the rock. Where W is the original gas reservoir pressure, p is the gas reservoir pressure, and W is the gas reservoir pressure. e This represents the cumulative amount of water intrusion.

[0032] Specifically, the apparent geological reserves method, based on the material balance equation (3) for abnormally high-pressure gas reservoirs, can be modified to obtain: (Equation 1) in, (Equation 2) Further transformation yields: (Equation 3) Define variables: (Equation 4) Then equation (3) becomes: (Equation 5) From equation (4), the daily water intrusion can be calculated using the following formula: (Equation 6) Therefore, we have formula (1): (1); in, W e To calculate the cumulative water intrusion volume, B g B is the natural gas volume factor. gi C is the natural gas volume factor under the original formation pressure. e Let ΔP be the combined compressibility coefficient of the fluid and rock, ΔP be the average pressure drop of the gas reservoir, and ΔG = G. P -G, G P G represents the original reserves of natural gas, which is considered as geological reserves.

[0033] The cumulative water intrusion of the gas reservoir can be calculated based on the above equation, and the result is 4.96 million cubic meters. A typical curve of the cumulative water intrusion of the gas reservoir is shown below. Figure 3 As shown.

[0034] Specifically, the apparent pressure method can be derived from the material balance equation (3) of an abnormally high-pressure gas reservoir: (Equation 7) in, (Equation 8) (Equation 9) The mass balance equation for an abnormally high-pressure gas reservoir is: (Equation 10) From the difference between the two mass balance equations (Equation 6) and (Equation 9), we can obtain: (Equation 11) (Equation 12) (Equation 13) Among them, W e To calculate the cumulative water intrusion volume, W p For cumulative water production, B w The formation water volume factor is... Let p be the pressure difference between the original gas reservoir and the current gas reservoir, Z be the deviation factor of natural gas, G be the original natural gas reserves, and B be the pressure difference between the original gas reservoir and the current gas reservoir pressure. gi This represents the natural gas volume factor under the original formation pressure.

[0035] The cumulative water intrusion of the gas reservoir can be calculated based on the above equation, and the result is 4.72 million cubic meters. A typical curve of the cumulative water intrusion is shown below. Figure 4 As shown.

[0036] The daily water intrusion was then calculated by using the difference between the cumulative water intrusion at two different times using the two methods mentioned above, and the daily water intrusion exceeded 4,000 cubic meters.

[0037] The total drainage volume of the gas reservoir is determined based on the daily water intrusion, and the total drainage volume of the old wells is also determined. Determination of total gas reservoir drainage: The total gas reservoir drainage was determined by combining numerical simulation, surface support, and economic evaluation. The total gas reservoir drainage was less than or equal to the daily water intrusion, and the total gas reservoir drainage was as close as possible to the daily water intrusion. Numerical simulation showed that a daily drainage of 2800 cubic meters was appropriate. The total drainage volume of the old wells was determined as follows: Water-flooded wells along the preferred drainage channels were selected. The drainage volume of each individual well was determined based on production dynamics and renovation progress. The sum of the drainage volumes of all individual wells constitutes the total drainage volume of the old wells. Currently, the stable daily drainage volume of wells Keshen 801 and 802 is 350-500 t / d, with optimized design drainage volumes of 400 and 300 t / d respectively. Wells KeS8-11, 8-9, and 8-7 have lower stable water production, ranging from 60 to 350 t / d, with a designed drainage volume of 200 t / d for each. Therefore, the daily drainage volume of the five old wells is 1300 cubic meters.

[0038] The gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of the old wells. The gap drainage volume is the drainage volume of the new wells that need to be deployed to supplement the drainage volume. The gap drainage volume is determined as follows: Gap drainage volume = Total drainage volume of the gas reservoir - Total drainage volume of the old well = 1500 cubic meters / day. Therefore, it is necessary to deploy a new well to supplement the drainage volume, with a new well supplementing the drainage volume of 1500 cubic meters / day.

[0039] The type, drainage volume, and quantity of new wells are determined based on the required drainage volume of the new wells to be deployed; and the orientation, planar position, vertical position, and length of the well trajectory are set. New well design justification: Vertical wells can only control a single waterway and have limited drainage capacity. Inclined wells can control multiple main water intrusion channels and have a drainage capacity 2-3 times that of vertical wells. Inclined wells or horizontal wells are recommended. The drainage capacity of the new well has been determined: The new well has drilled through two faults and is expected to produce about twice the water of the vertical well. The designed drainage capacity of the new well is 500t / d. Demonstration of the number of new wells: 1500 / 500=3; Well trajectory orientation: Maintain wellbore stability and drill through multiple main water intrusion channels; the optimal well trajectory orientation is 20°~50°; Well trajectory planar location: deployed at the water intrusion front; numerical simulation calculations show that the water intrusion in the western part of the gas reservoir gradually decreases from the pure water zone to the water intrusion front. The water intrusion in the water-flooded zone at the western boundary of the gas reservoir is about 4,500 cubic meters per day, while at the water intrusion front, due to pressure consumption and reservoir intrusion during the water intrusion process, the water intrusion is only about 2,000 cubic meters per day. Comparing different deployment locations of the new well in the planar location, deployment at the water intrusion front has a better drainage effect. Vertical well trajectory location: Select the location of the dominant water intrusion channel or the gas production point of the adjacent gas well; Dynamic and static data such as drilling fluid loss and gas production profile test show that the gas production points of the gas wells are mainly distributed in the Ba-2 section, which is also the main water production layer in the later stage. The horizontal well trajectory design in the Ba-2 section can effectively control the water production channel and increase the drainage of a single well. Well trajectory length verification: Crossing more water intrusion channels; the distance between the main water intrusion channels in the western part of the Keshen 8 block is 300~400m. By deploying horizontal wells along the axis and drilling and excavating to the lower parts on both sides, the well trajectory displacement of 600m can basically control the main water intrusion channels on both sides of the axis.

[0040] Based on the above analysis, three highly inclined drainage wells were deployed on the main water intrusion channel at the western water intrusion front to inhibit further water intrusion into the gas reservoir and improve the production rate of gas wells in the pure gas area. The new well was deployed at the water intrusion front, drilling and excavating from the structural axis to the north and south wings. The target layer was drilled through the major fault of the main water intrusion channel, and the bottom of the second section of the Ba section was completed. The horizontal displacement of the AB target point was 600m.

[0041] Example 2 See Figure 6 Taking the Tarim Basin's A gas reservoir as an example, this gas field suffers from severe non-uniform water intrusion, fractured water channeling, and a decline in reserve utilization. Currently, existing wells have limited drainage capacity and cannot effectively suppress water intrusion rates. Furthermore, existing wells have limited channels for controlling water intrusion, necessitating an improvement to the well network. The specific implementation involves: Determine the water intrusion pattern and channels in the gas reservoir and calculate the cumulative water intrusion volume. Based on the cumulative water intrusion volume, calculate the daily water intrusion volume. The total drainage volume of the gas reservoir is determined based on the daily water intrusion, and the total drainage volume of the old well is determined based on the actual drainage situation and renovation of the old well. The gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of the old wells. The gap drainage volume is the drainage volume of the new wells that need to be deployed to supplement the drainage volume. The type, drainage volume, and quantity of new wells are determined based on the required drainage volume of new wells to be deployed; and the orientation, planar position, vertical position, and length of the well trajectory are set.

[0042] Specifically, well type justification: Vertical wells can only control a single water channel, with limited drainage capacity. High-angle wells can control multiple main water intrusion channels, and their drainage capacity is 2-3 times that of vertical wells; therefore, high-angle wells are recommended. Well trajectory orientation: Considering the purpose of the drainage well to penetrate multiple main water intrusion channels, the optimal well trajectory orientation is 30°~50°. Well trajectory planar location: Numerical simulation calculations show that the water intrusion in the western part of the gas reservoir gradually decreases from the pure water zone to the water intrusion front. The water intrusion in the water-flooded zone at the western boundary of the gas reservoir is around 4500 cubic meters per day, while at the water intrusion front, due to pressure loss and reservoir intrusion during the water intrusion process, the water intrusion is only around 2000 cubic meters per day. Comparing different deployment locations of new wells in the planar analysis, deploying the drainage at the water intrusion front yields better results.

[0043] Vertical location of well trajectory: Dynamic and static data such as drilling fluid loss and gas production profile test show that the gas production points of the gas wells are mainly distributed in the Ba-2 section, which is also the main water-producing layer in the later stage. The horizontal well trajectory design in the Ba-2 section can effectively control the water production channel and increase the drainage of a single well.

[0044] Well trajectory length verification: The distance between the main water intrusion channels in the western part of the gas field is 300~400m. By deploying horizontal wells along the axis and drilling and excavating to the lower parts on both sides, the well trajectory displacement of 600m can basically control the main water intrusion channels on both sides of the axis.

[0045] Planar location of wells in the flooded area: The area between the main water intrusion channels in the flooded area is a region rich in residual gas. High-angle wells can be designed and deployed to achieve the dual purpose of drainage and potential tapping. Since the water body in the main water intrusion channel on the north wing of the gas reservoir has strong energy and small drainage volume, strong drainage can be carried out in the flooded area to further increase the drainage volume of the northern water intrusion channel and effectively inhibit the intrusion of northern formation water.

[0046] Horizontal well selection: Well A1 is preferably located at a trajectory strike of 320°, with a displacement of 600m between points A and B, a vertical thickness of 250m in the target layer, an elevation difference of 475m between points A and B, and a distance of 400m from Keshen 802. It will be drilled from the structural axis towards the north wing, penetrating the target layer through two main water intrusion channels on the north wing. Well A2 is preferably located at a trajectory strike of 195°, with a displacement of 600m between points A and B, a vertical thickness of 250m in the target layer, an elevation difference of 380m between points A and B, and a distance of 305m from Keshen 8-7. It will be drilled from the structural axis towards the south wing, penetrating the target layer through two main water intrusion channels on the south wing. Well A3 is preferably located at a trajectory strike of 45°, with a displacement of 600m between points A and B, a vertical thickness of 250m in the target layer, and an elevation difference of 430m between points A and B. It will be drilled from the structural axis towards the northeast wing, serving both the purpose of tapping potential in the flooded area and drainage.

[0047] This invention provides an electronic device, the electronic device comprising: Memory, which stores executable instructions; A processor that executes the executable instructions in the memory to implement the above-described method for deploying a gas reservoir drainage well.

[0048] The present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for deploying a gas reservoir drainage well.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for deploying drainage wells in a gas reservoir, characterized in that, Includes the following steps: Determine the water intrusion pattern and channels in the gas reservoir and calculate the cumulative water intrusion volume. Based on the cumulative water intrusion volume, calculate the daily water intrusion volume. The total drainage volume of the gas reservoir is determined based on the daily water intrusion, and the total drainage volume of the old well is determined based on the actual production situation of the old well. The gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of the old wells. The gap drainage volume is the drainage volume of the new wells that need to be deployed to supplement the drainage volume. The type, drainage volume, and quantity of new wells are determined based on the required drainage volume of new wells to be deployed; and the orientation, planar position, vertical position, and length of the well trajectory are set.

2. The method for deploying a gas reservoir drainage well according to claim 1, characterized in that, The specific steps for determining the water intrusion model and channels in a gas reservoir and calculating the daily water intrusion are as follows: Based on the gas and water production data recorded during the development process, the measured formation pressure data, and the necessary fluid analysis data, the cumulative water intrusion of the gas reservoir at two specific moments is calculated using the apparent geological reserves method and the apparent pressure method. The daily water intrusion is calculated based on the difference between the cumulative water intrusion at two different times.

3. A method for deploying a gas reservoir drainage well according to claim 2, characterized in that, The apparent geological reserves method is based on the mass balance equation of abnormally high-pressure gas reservoirs, and the cumulative water intrusion is obtained through formula (1): （1） in, W e To calculate the cumulative water intrusion volume, B g B is the natural gas volume factor. gi C is the natural gas volume factor under the original formation pressure. e Let ΔP be the combined compressibility coefficient of the fluid and rock, ΔP be the average pressure drop of the gas reservoir, and ΔG = G. P -G, G P G represents the original reserves of natural gas, which is considered as geological reserves.

4. A method for deploying a gas reservoir drainage well according to claim 2, characterized in that, The apparent pressure method is based on the material balance equation of an abnormally high-pressure gas reservoir, and the cumulative water intrusion is obtained through formula (2); （2） Among them, W e To calculate the cumulative water intrusion volume, W p For cumulative water production, B w The formation water volume factor is... Let p be the pressure difference between the original gas reservoir and the current gas reservoir, Z be the deviation factor of natural gas, G be the original natural gas reserves, and B be the pressure difference between the original gas reservoir and the current gas reservoir pressure. gi This represents the natural gas volume factor under the original formation pressure.

5. A method for deploying a gas reservoir drainage well according to claim 2, characterized in that, The material balance equation for the abnormally high-pressure gas reservoir is Equation (3). （3）； in, To accumulate gas production, B g B is the natural gas volume factor. gi This represents the natural gas volume factor under the original formation pressure. W p For the cumulative water production, B w S is the formation water volume factor, G is the original natural gas reserves, and S is the formation water volume factor. wi C represents the initial water saturation level. w C is the formation water volume compressibility coefficient. f The volume compressibility coefficient of the rock. Where W is the original gas reservoir pressure, p is the gas reservoir pressure, and W is the gas reservoir pressure. e This represents the cumulative amount of water intrusion.

6. The method for deploying a gas reservoir drainage well according to claim 1, characterized in that, The total drainage volume of the gas reservoir is determined based on the daily water intrusion, and the specific total drainage volume of the old wells is determined based on the actual production situation of the old wells as follows: Determination of total gas reservoir drainage: The total gas reservoir drainage is determined by combining numerical simulation, surface support, and economic evaluation, and the total gas reservoir drainage is less than or equal to the daily water intrusion. Determining the total drainage volume of old wells: Prioritize the drainage of flooded wells on the advantageous channels, and determine the drainage volume of each well based on production dynamics and renovation status. The sum of the drainage volumes of all individual wells is the total drainage volume of old wells.

7. The method for deploying a gas reservoir drainage well according to claim 1, characterized in that, The gap drainage volume is determined based on the total drainage volume of the gas reservoir and the total drainage volume of the old wells. The gap drainage volume is the drainage volume of the new wells that need to be deployed to supplement the drainage volume. Specifically: Determining the gap drainage volume: Gap drainage volume = Total drainage volume of gas reservoir - Total drainage volume of old well.

8. A method for deploying a gas reservoir drainage well according to claim 1, characterized in that, The type, drainage capacity, and quantity of new wells are determined based on the required drainage volume; and the orientation, planar position, vertical position, and length of the well trajectory are set as follows: The new well type is either a highly deviated well or a horizontal well; The well trajectory orientation maintains wellbore stability and drills through multiple main water intrusion channels; The well trajectory is positioned at the water intrusion front; The vertical location of the well trajectory is chosen to select the location of the dominant water intrusion channel or the main gas-producing layer of the adjacent gas well; The length of the well trajectory is the length of the passage through more water intrusion channels.

9. An electronic device, characterized in that, The electronic device includes: Memory, which stores executable instructions; A processor that executes the executable instructions in the memory to implement a method for deploying a gas reservoir drainage well according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements a method for deploying a gas reservoir drainage well according to any one of claims 1-8.

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