CN115075778A - Coal bed gas/coal bed integrated recovery method and device, electronic equipment and medium - Google Patents
Coal bed gas/coal bed integrated recovery method and device, electronic equipment and medium Download PDFInfo
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- CN115075778A CN115075778A CN202110267082.6A CN202110267082A CN115075778A CN 115075778 A CN115075778 A CN 115075778A CN 202110267082 A CN202110267082 A CN 202110267082A CN 115075778 A CN115075778 A CN 115075778A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
Abstract
The application discloses a coal bed gas/coal bed integrated recovery method, a device, electronic equipment and a medium. The method can comprise the following steps: establishing a coal bed gas/coal bed integrated development well pattern; performing depletion mining on the coal bed gas of the coal bed gas layer; injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and outputting the synthetic gas from the output well; CO in synthetic gas 2 Injecting the coal bed gas layer, and performing desorption type exploitation on the adsorbed gas of the coal bed gas layer; after the adsorbed gas is produced, the integrated development well pattern is sealed and CO is sealed and stored 2 . The invention realizes the development of deep hard coal mining charcoal and solves the problem of CO in the gasified coal gas produced after coal gasification 2 Emission problem, application of CO 2 The recovery ratio and the sealing storage of the oil and gas reservoir are improved, and the economic and effective development and utilization are realized.
Description
Technical Field
The invention relates to the field of comprehensive utilization of coal resources, in particular to a coal bed gas/coal bed integrated recovery method, a device, electronic equipment and a medium.
Background
The world coal resources are very abundant, and coal is the most abundant fossil fuel in the world. Currently, the world coal reserves are estimated to be 1.055 trillion tons, with most reserves being anthracite and bituminous (reserves 7349.03 million tons, 70% by weight). For strategic safety and environmental protection, various countries around the world are working on developing diverse forms of energy. From the social and economic development demands and the existing energy conditions, coal resources with relatively large reserves can be cleanly, efficiently and comprehensively utilized, on one hand, the ever-increasing energy demand can be met, on the other hand, the diversification of energy structures can be promoted, and the great contribution is made to the construction of an ecological civilized society.
Coal gasification is one of the core technologies for efficient and clean utilization of coal, and the products of coal gasification are synthesis gas (CO and H) 2 ) Is the starting point of various coal chemical processes, and the cost of the coal chemical process can be effectively reduced by vigorously developing the coal gasification technology. Inspired by traditional coal gasification processes, the concept of combining coal mining with gasification processes has also emerged: coal is gasified Underground (UCG). The underground coal gasification process takes the coal layer at the bottom of the ground as a closed gasification furnace to carry out controlled combustion gasification on the coal layer. Similar to the traditional coal gasification process, the gasifying agent is generally O 2 (air) and H 2 And O, which is injected into the underground passage (or cave) through the injection well and reacts with the coal bed in situ. The underground coal gasification process saves the cost of coal mining and transportation, reduces the safety of mining workers on the other hand, and provides a potential development direction for development, processing and utilization of coal.
However, underground coal gasification is currently mainly aimed at the problem of shallow coal gasification. And the traditional mechanical mining method is difficult to mine thin-layer coal, steeply inclined coal seams, buried depths of more than 1000 meters and residual underground coal in waste mining areas. If deep coal bed gas is exploitedThe comprehensive utilization of the coal can be realized by chemical comprehensive development. In addition, gasified coal (H) produced by gasifying coal 2 、CH 4 、CO 2 、SO 2 Isomixe) has a large amount of CO 2 How to solve CO 2 The issue of emissions is also a major issue to be investigated.
Therefore, there is a need to develop a method, device, electronic device and medium for integrated recovery of coal bed gas/coal bed.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a coal bed gas/coal bed integrated recovery method, a device, electronic equipment and a medium, which can realize the development of deep coal-hard coal-mining charcoal and solve the problem of CO in coalification gas produced after coal gasification 2 Emission problem, application of CO 2 The recovery ratio and the sealing storage of the oil and gas reservoir are improved, and the economic and effective development and utilization are realized.
In a first aspect, an embodiment of the present disclosure provides a method for integrally recovering coal bed methane/coal bed, including:
establishing a coal bed gas/coal bed integrated development well pattern;
performing depletion mining on the coal bed gas of the coal bed gas layer;
injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and outputting the synthetic gas from the output well;
converting CO in the synthesis gas 2 Injecting the coal bed gas layer, and performing desorption type mining on the adsorbed gas of the coal bed gas layer;
after the production of the adsorbed gas is finished, the integrated development well pattern is sealed and CO is sealed and stored 2 。
Preferably, the coalbed methane/coalbed integrated development well pattern is a diamond well pattern.
Preferably, the direction of the long side of the diamond-shaped well pattern is parallel to the direction of the natural fracture dominance or the direction of the artificial fracture, the injection well is arranged at the vertex of the diamond-shaped well pattern, and the production well is arranged at the inner central point of the diamond-shaped well pattern.
Preferably, determining the well spacing of the diamond-shaped pattern comprises:
calculating the single-well control economic limit reserves;
and calculating the well spacing according to the single well control economic limit reserves.
Preferably, the individual well control economic limit reserves are calculated by equation (1):
G g ＝G gm +k×G gz (1)
wherein G is g For individual well control of economic ultimate reserves, G gm The economic limit reserves of the coal bed gas are controlled for a single well,
G gz for controlling the economic limit reserves of coal gas production for a single well,
k is the overlapping rate of coal bed gas and coal gas reservoir in unit area, C 1 Total cost for single well drilling and gas construction, C 2 Conversion of gas wells to coal-to-gas wells to current investment costs, P 1 The annual average gas production operation cost T of the coal bed gas single well 1 Is the coal bed gas production age, P 2 The annual average gas production operation cost T of the coal gas production single well 2 For the coal gas production life, A g For selling the price of coal bed gas, A gz Selling price for coal gas, E rm For recovery of coal bed gas, E rz The recovery ratio of coal gas production is obtained.
Preferably, calculating the well spacing comprises:
wherein F is the abundance of resources, Dx and Dy are the major axis and the minor axis of the diamond well pattern, and theta is the included angle of the diamond well pattern.
Preferably, CO injection 2 At the end of increasing the recovery ratio of the hydrocarbon reservoir, CO is applied 2 Sealing and reducing CO 2 And (5) discharging.
As a specific implementation of the embodiments of the present disclosure,
in a second aspect, an embodiment of the present disclosure further provides a coal bed gas/coal bed integrated recovery device, including:
a network building module is used for building a coal bed gas/coal bed integrated development well network;
the coal bed gas mining module is used for carrying out exhaustion type mining on the coal bed gas of the coal bed gas layer;
the coal bed reaction module is used for injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and outputting synthetic gas from the output well;
a coal bed gas re-mining module for recovering CO in the synthesis gas 2 Injecting the coal bed gas layer, and performing desorption type mining on the adsorbed gas of the coal bed gas layer;
a sealing module for sealing the integrated development well pattern and sealing CO after the production of the adsorbed gas is finished 2 。
Preferably, the coalbed methane/coalbed integrated development well pattern is a diamond well pattern.
Preferably, the direction of the long side of the diamond-shaped well pattern is parallel to the direction of the natural fracture dominance or the direction of the artificial fracture, the injection well is arranged at the vertex of the diamond-shaped well pattern, and the production well is arranged at the inner central point of the diamond-shaped well pattern.
Preferably, determining the well spacing of the diamond-shaped pattern comprises:
calculating the economic limit reserves of single well control;
and calculating the well spacing according to the single-well control economic limit reserves.
Preferably, the individual well control economic limit reserves are calculated by equation (1):
G g ＝G gm +k×G gz (1)
wherein G is g For individual well control of economic ultimate reserves, G gm The economic limit reserves of the coal bed gas are controlled for a single well,
G gz for controlling the economic limit reserves of coal gas production for a single well,
k is the overlapping rate of coal bed gas and coal gas reservoir in unit area, C 1 Total cost for single well drilling and gas construction, C 2 Conversion of gas wells to coal-to-gas wells to current investment costs, P 1 The annual average gas production operation cost T of the coal bed gas single well 1 Is the coal bed gas production age, P 2 The annual average gas production operation cost T of the coal gas production single well 2 For the coal gas production life, A g For selling the price of coal bed gas, A gz Selling price for coal gas, E rm For recovery of coal bed gas, E rz The recovery ratio of coal gas production is obtained.
Preferably, calculating the well spacing comprises:
wherein F is the abundance of resources, Dx and Dy are the major axis and the minor axis of the diamond well pattern, and theta is the included angle of the diamond well pattern.
Preferably, CO injection 2 At the end of increasing the recovery ratio of the hydrocarbon reservoir, CO is applied 2 Sealing and reducing CO 2 And (5) discharging.
In a third aspect, an embodiment of the present disclosure further provides an electronic device, where the electronic device includes:
a memory storing executable instructions;
and the processor executes the executable instructions in the memory to realize the coalbed methane/coalbed integrated recovery method.
In a fourth aspect, the disclosed embodiments also provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for recovering coal bed methane/coal bed integration is implemented.
The beneficial effects are that:
(1) the development of deep hard coal mining charcoal is realized through in-situ combustion reaction;
(2) the underground coal gasification process saves the cost of coal mining and transportation, indirectly ensures the safety of coal miners and provides a potential development direction for development, processing and utilization of coal;
(3) meanwhile, the coal bed gas production and later-stage underground coal gasification injection and production requirements are considered, an integrated development well pattern is deployed, and later-stage investment cost is saved.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
FIG. 1 shows a schematic diagram of a different angle diamond pattern according to one embodiment of the present invention.
FIG. 2 shows a schematic of the propagation of fractured vertical well pressures in accordance with an embodiment of the present invention.
FIG. 3 shows a schematic diagram of a diamond pattern calculation according to an embodiment of the invention.
Figure 4 shows a flow chart of the steps of a coal bed methane/coal bed integrated recovery method according to one embodiment of the present invention.
Figure 5 shows a schematic diagram of a coal bed gas/coal bed integrated development well pattern for an a-block coal bed gas development stage of the orldos basin in accordance with one embodiment of the present invention.
Figure 6 shows a schematic diagram of a coal bed gas/coal bed integrated development well pattern for an a-block coal underground gasification integrated utilization stage of an erudos basin according to one embodiment of the present invention.
Figure 7 illustrates a block diagram of a coal bed methane/coal bed integrated recovery device according to one embodiment of the present invention.
Description of reference numerals:
201. a networking module; 202. a coal bed gas mining module; 203. a coal bed reaction module; 204. a coal bed gas re-mining module; 205. and (7) a sealing and storing module.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
The invention provides a coal bed gas/coal bed integrated recovery method, which comprises the following steps:
establishing a coal bed gas/coal bed integrated development well pattern;
performing depletion mining on the coal bed gas of the coal bed gas layer;
injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and outputting the synthetic gas from the output well;
CO in synthetic gas 2 Injecting the coal bed gas layer, and performing desorption type exploitation on the adsorbed gas of the coal bed gas layer;
after the absorbed gas exploitation is finished, the integrated exploitation well pattern is sealed, and CO is sealed and stored 2 。
In one example, the coalbed methane/coal seam integrated development well pattern is a diamond well pattern.
In one example, the direction of the long side of the diamond-shaped well pattern is parallel to the direction of the natural fracture dominance or the direction of the artificial fracture, the injection well is arranged at the vertex of the diamond-shaped well pattern, and the production well is arranged at the inner center point of the diamond-shaped well pattern.
In one example, determining the well spacing for a diamond-shaped well pattern comprises:
calculating the economic limit reserves of single well control;
and calculating the well spacing according to the economic limit reserves of single well control.
In one example, the individual well control economic limit reserve is calculated by equation (1):
G g ＝G gm +k×G gz (1)
wherein G is g For individual well control of economic ultimate reserves, G gm The economic limit reserves of the coal bed gas are controlled for a single well,
G gz for controlling the economic limit reserves of coal gas production for a single well,
k is the overlapping rate of coal bed gas and coal gas reservoir in unit area, C 1 Total cost for single well drilling and gas construction, C 2 Conversion of gas wells to coal-to-gas wells to current investment costs, P 1 The annual average gas production operation cost T of the coal bed gas single well 1 Is the coal bed gas production age, P 2 The annual average gas production operation cost T of the coal gas production single well 2 For the coal gas production life, A g For selling the price of coal bed gas, A gz Selling price for coal gas, E rm For recovery of coal bed gas, E rz The recovery ratio of coal gas production is obtained.
In one example, calculating the well spacing comprises:
wherein F is the abundance of resources, Dx and Dy are the major axis and the minor axis of the diamond well pattern, and theta is the included angle of the diamond well pattern.
In one example, CO injection 2 At the end of increasing the recovery ratio of the hydrocarbon reservoir, CO is applied 2 Sealing and reducing CO 2 And (4) discharging.
Specifically, the optimization elements of the integrated development well pattern for underground coal gasification comprehensive utilization generally comprise: pattern of patterns (plan geometry between wells), orientation of patterns, density of patterns, etc. Different from conventional gas reservoir development, the permeability of the coal bed gas in a target area is low, and a large-area pressure drop funnel can be formed in the coal bed only by implementing drilling and production development on a small-well-spacing well pattern. The research optimizes the well spacing and the well pattern form by combining the characteristics of the well pattern deployment of the coal bed gas and the coal gas, and the economy of the well deployment.
FIG. 1 shows a schematic diagram of a different angle diamond pattern according to one embodiment of the present invention.
Establishing a coal bed gas/coal bed integrated development well pattern; rectangular well patterns and rhombic well patterns are mostly adopted in coal bed gas development. And (4) selecting a rhombic well pattern by considering evaluation of lithologic packing property of the top plate and the bottom plate, gas content, permeability difference in different directions and the like so as to achieve the purpose of uniform integral pressure drop between wells in the later drainage and depressurization processes. The pattern requires vertical well placement in both the main permeate direction and the direction perpendicular to the main permeate direction so that adjacent four wells are in a diamond shape, as shown in fig. 1. The well arrangement mode has the greatest advantage that when coal bed gas development drainage depressurization is carried out, the pressure between wells is reduced uniformly, and the purpose of simultaneously depressurizing development areas can be achieved.
FIG. 2 shows a schematic of the propagation of fractured vertical well pressures in accordance with an embodiment of the present invention.
The determination of the well pattern orientation is typically based. The coal seam artificial fractures generally extend along the face-cutting direction, and the actual coal seam gas reservoir is distributed along the face-cutting direction and the end-cutting direction, as shown in fig. 2. Because the face-cutting direction is the main permeability direction and the influence of artificial cracks is added, the pressure propagation in the face-cutting direction is fast, and the pressure propagation in the end-cutting direction is controlled by the secondary permeability and is slow. In order to balance the pressure drop of the coal bed gas well in all directions, the inter-well interference time is the same so as to achieve the maximum gas production rate, the well spacing in the face-cutting direction can be properly enlarged, and the well spacing in the end-cutting direction is controlled to be smaller. Therefore, for the anisotropic coal seam fracturing vertical well, a rectangular well pattern and a rhombic well pattern are selected, wherein the long edge of the rectangle is in the cutting direction of the face, and the short edge of the rectangle is in the cutting direction of the end; the long diagonal of the diamond well pattern is along the surface cutting direction, and the short diagonal is along the end cutting direction; the rectangular length-width relation and the rhombus diagonal length relation are influenced by fracture parameters and coal bed permeability to fracture the fracture azimuth and dominate the natural fracture azimuth, and the long side direction is parallel to the natural fracture dominating direction or the artificial fracture direction. And (4) in consideration of the extension direction of the main stress, one coalbed methane development well is encrypted at the center of the four wells, and the encrypted coalbed methane development well is arranged in the middle of the rhombic well pattern and serves as a gas production well after coal gas production transformation in the later period. The middle encrypted well is considered as a coal gas production well in the later period, and the encrypted well is not fractured in order to prevent gas channeling in the production process.
And determining the integrated well pattern well type of the underground coal gasification comprehensive utilization, and evaluating the well distance of the integrated well pattern in the next step. The well spacing of the diamond-shaped well pattern is determined by the following method:
the reasonable control reserves of the single well are considered in the determination of the development well spacing, so that the single well control reserves of the high-abundance area are not too large, and the single well control reserves of the low-abundance area are larger than the economic limit reserves. On the basis, the well spacing or the well pattern density is further calculated according to the abundance of the resources.
Wherein G is g Controlling the reserves of a single well, q is the average capacity of the single well at the end of a stable production period, d is the number of days of gas production per year, t is the stable age of a gas reservoir, N is the recoverable reserve at the end of the stable production period, E r Is the gas reservoir recovery efficiency.
The total cost of a coal bed gas well/coal gas well from drilling to abandonment includes: drilling, reservoir transformation (coal gas channel), ground construction, gas production cost and the like. To achieve economic benefits, the total cost should be greater than sales revenue, which requires sufficient reserves, i.e., single well controlled economic limit reserves, which is an important economic indicator for selecting reasonable well spacing. And (3) calculating the economic limit reserves of the single well control through the formula (1).
Because the size of the economic limit well spacing is greatly influenced by the abundance of resources, when the influence of the well pattern density on the recovery ratio is not considered, the economic limit well spacing can be calculated by controlling the economic limit reserves according to a single well. In the calculation process, the superposition of two reserves, namely the coal bed gas reserve and the coal gas reserve, is considered. In addition, the adopted rhombic well pattern also needs to consider the spreading and air leakage range of the vertical well artificial fracture after fracturing. According to the pressure propagation diagram of the fractured vertical well, it can be known that the direction of the artificial fracture is along the surface-cleated direction, equipotential lines in the coal bed gas development process expand outwards in an elliptical form, and the elliptical focal length is the half-length of the fracture, as shown in fig. 2. The elliptic equipotential surface of the ring satisfies
Wherein L is f Half the length of the crack.
According to the diamond area calculation formula:
FIG. 3 shows a schematic diagram of a diamond pattern calculation according to an embodiment of the invention.
D x 、D y The relationship is related to the design diamond pattern included angle. From FIG. 3, D can be obtained x And D y The relationship between them is:
theta is the included angle of the diamond well pattern and is determined according to the crack development degree and the spreading characteristics.
One rhombus comprises the air leakage area of 2 straight wells, so that the long axis D in the single well control area can be obtained x Is the formula (2), short axis D y The calculation formula of (2) is formula (3).
The coal underground gasification is comprehensively utilized, the exhaustion type exploitation is carried out aiming at the coal bed gas of the coal bed gas layer, and the coal gasification operation is carried out at the last stage of the gas production of the coal bed gas. Igniting at the bottom of a gas well of a gas injection well, igniting by a gas inlet drum such as air and the like, and forming a combustion area at one end of a gasification channel, wherein the combustion surface is called a flame working surface. The high temperature gas produced permeates forward along the gasification channel by the action of pressure and simultaneously transfers the heat carried by the gas to the surrounding coal bed. The injected gas reacts with the coal bed in situ to produce synthetic gas, the produced synthetic gas is produced from the production well, and the solid wastes such as ash, grindstone and the like are left underground. The produced gas is used for burning a boiler to generate electricity, and combined cycle power generation is realized.
Gasified coal gas (H) produced after coal gasification 2 、CH 4 、CO 2 、SO 2 Isomixe) has a large amount of CO 2 The carbon separation can be used for injecting the coal bed gas layer, performing desorption exploitation on the adsorbed gas of the coal bed gas layer, and injecting the adsorbed gas into an oil reservoir or a gas reservoir, so that the recovery ratio of the oil reservoir and the gas reservoir can be improved. When the gas well produces CO 2 After a molar percentage of more than 10%, CO is carried out 2 Sealing and reducing CO 2 And (5) discharging. CO produced by underground coal gasification 2 The waste gas is reinjected to the bottom of the natural gas reservoir, thereby not only realizing the improvement of the recovery ratio of the petroleum and the natural gas, but also achieving the purpose of sealing partial CO 2 The purpose of the method is to provide a good measure for energy conservation and emission reduction.
The invention also provides a coal bed gas/coal bed integrated recovery device, which comprises:
the network building module is used for building a coal bed gas/coal bed integrated development well network;
the coal bed gas mining module is used for carrying out exhaustion type mining on the coal bed gas of the coal bed gas layer;
the coal bed reaction module is used for injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and outputting synthetic gas from the output well;
a coal bed gas re-mining module for recovering CO in the synthesis gas 2 Injecting the coal bed gas layer, and performing desorption type exploitation on the adsorbed gas of the coal bed gas layer;
a sealing module for sealing the integrated exploitation well pattern and sealing CO after the completion of the production of the adsorbed gas 2 。
In one example, the coalbed methane/coal seam integrated development well pattern is a diamond well pattern.
In one example, the direction of the long side of the diamond-shaped well pattern is parallel to the direction of the natural fracture dominance or the direction of the artificial fracture, the injection well is arranged at the vertex of the diamond-shaped well pattern, and the production well is arranged at the inner center point of the diamond-shaped well pattern.
In one example, determining the well spacing for a diamond-shaped well pattern comprises:
calculating the economic limit reserves of single well control;
and calculating the well spacing according to the economic limit reserves of single well control.
In one example, the individual well control economic limit reserve is calculated by equation (1):
G g ＝G gm +k×G gz (1)
wherein G is g For individual well control of economic ultimate reserves, G gm The economic limit reserves of the coal bed gas are controlled for a single well,
G gz for controlling the economic limit reserves of coal gas production for a single well,
k is the overlapping rate of coal bed gas and coal gas reservoir in unit area, C 1 Total cost for single well drilling and gas construction, C 2 Conversion of gas wells to coal-to-gas wells to current investment costs, P 1 The annual average gas production operation cost T of the coal bed gas single well 1 Is the coal bed gas production age, P 2 The annual average gas production operation cost T of the coal gas production single well 2 For the coal gas production life, A g Selling price for coal bed gas, A gz Selling price for coal gas, E rm For recovery of coal bed gas, E rz The recovery ratio of coal gas production is obtained.
In one example, calculating the well spacing comprises:
wherein F is the abundance of resources, Dx and Dy are the major axis and the minor axis of the diamond well pattern, and theta is the included angle of the diamond well pattern.
In one example, CO injection 2 At the end of increasing the recovery ratio of the hydrocarbon reservoir, CO is applied 2 Sealing and reducing CO 2 And (5) discharging.
Specifically, the optimization elements of the integrated development well pattern for underground coal gasification comprehensive utilization generally include: pattern of patterns (plan geometry between wells), orientation of patterns, density of patterns, etc. Different from conventional gas reservoir development, the permeability of the coal bed gas in a target area is low, and a large-area pressure drop funnel can be formed in the coal bed only by implementing drilling and production development on a small-well-spacing well pattern. The research optimizes the well spacing and the well pattern form by combining the characteristics of the well pattern deployment of the coal bed gas and the coal gas, and the economy of the well deployment.
Establishing a coal bed gas/coal bed integrated development well pattern; rectangular well patterns and rhombic well patterns are mostly adopted in coal bed gas development. And (4) evaluating the lithologic packing property of the top plate and the bottom plate, the gas content, the difference of permeability in different directions and the like, and selecting a rhombic well pattern to fulfill the aim of uniform and integral pressure drop between wells in the later stage water drainage and pressure reduction process. This pattern requires that the wells be vertically spaced in both the main permeate direction and the direction perpendicular to the main permeate direction so that adjacent four wells are in a diamond shape, as shown in figure 2. The well arrangement mode has the greatest advantage that when coal bed gas development drainage depressurization is carried out, the pressure between wells is reduced uniformly, and the purpose of simultaneously depressurizing development areas can be achieved.
The determination of the well pattern orientation is typically based. The coal seam artificial fractures generally extend along the face-cutting direction, and the actual coal seam gas reservoir is distributed along the face-cutting direction and the end-cutting direction, as shown in fig. 3. Because the face-cutting direction is the main permeability direction and the influence of artificial cracks is added, the pressure propagation in the face-cutting direction is fast, and the pressure propagation in the end-cutting direction is controlled by the secondary permeability and is slow. In order to balance the pressure drop of the coal bed gas well in all directions, the inter-well interference time is the same so as to achieve the maximum gas production rate, the well spacing in the face-cutting direction can be properly enlarged, and the well spacing in the end-cutting direction is controlled to be smaller. Therefore, for the anisotropic coal seam fracturing vertical well, a rectangular well pattern and a rhombic well pattern are selected, wherein the long edge of the rectangle is along the face cutting direction, and the short edge is along the end cutting direction; the long diagonal of the rhombic well pattern is along the surface cutting direction, and the short diagonal is along the end cutting direction; the rectangular length-width relation and the rhombus diagonal length relation are influenced by fracture parameters and coal bed permeability to fracture the fracture azimuth and dominate the natural fracture azimuth, and the long side direction is parallel to the natural fracture dominating direction or the artificial fracture direction. And (4) in consideration of the extension direction of the main stress, one coalbed methane development well is encrypted at the center of the four wells, and the encrypted coalbed methane development well is arranged in the middle of the rhombic well pattern and serves as a gas production well after coal gas production transformation in the later period. The middle encrypted well is considered as a coal gas production well in the later period, and the encrypted well is not fractured in order to prevent gas channeling in the production process.
And determining the integrated well pattern well type of the underground coal gasification comprehensive utilization, and evaluating the well distance of the integrated well pattern in the next step. The well spacing of the diamond-shaped well pattern is determined by the following method:
the reasonable control reserves of the single well are considered in the determination of the development well spacing, so that the single well control reserves of the high-abundance area are not too large, and the single well control reserves of the low-abundance area are larger than the economic limit reserves. On the basis, the well spacing or the well pattern density is further calculated according to the abundance of the resources.
Wherein G is g Controlling reserves for a single well, q is average production of the single well at the end of the steady production periodD is the number of days of gas production per year, t is the stable age of the gas reservoir, N is the recoverable reserve at the end of the stable production period, E r Is used for gas reservoir recovery.
The total cost of a coal bed gas well/coal gas well from drilling to abandonment includes: drilling, reservoir transformation (coal gas channel), ground construction, gas production cost and the like. To achieve economic benefits, the total cost should be greater than sales revenue, which requires sufficient reserves, i.e., single well controlled economic limit reserves, which is an important economic indicator for selecting reasonable well spacing. And (3) calculating the economic limit reserves of the single well control through the formula (1).
Because the size of the economic limit well spacing is greatly influenced by the abundance of resources, when the influence of the well pattern density on the recovery ratio is not considered, the economic limit well spacing can be calculated by controlling the economic limit reserves according to a single well. In the calculation process, the superposition of two reserves, namely the coal bed gas reserve and the coal gas reserve, is considered. In addition, the adopted rhombic well pattern also needs to consider the spreading and air leakage range of the vertical well artificial fracture after fracturing. According to the pressure propagation diagram of the fractured vertical well, it can be known that the direction of the artificial fracture is along the surface cutting direction, the equipotential lines in the coal bed gas development process expand outwards in an elliptical form, and the elliptical focal length is the half-length of the fracture, as shown in fig. 3. The elliptic equipotential surface of the ring satisfies
Wherein L is f Half the length of the crack.
According to the diamond area calculation formula:
D x 、D y the relationship is related to the design diamond pattern included angle. From FIG. 4, D can be obtained x And D y The relationship between them is:
theta is the included angle of the diamond well pattern and is determined according to the crack development degree and the spreading characteristics.
One rhombus comprises the air leakage area of 2 straight wells, so that the long axis D in the single well control area can be obtained x Is the formula (2), short axis D y The calculation formula of (2) is formula (3).
The coal underground gasification is comprehensively utilized, the exhaustion type exploitation is carried out aiming at the coal bed gas of the coal bed gas layer, and the coal gasification operation is carried out at the last stage of the gas production of the coal bed gas. Igniting at the bottom of a gas well of a gas injection well, igniting by a gas inlet drum such as air and the like, and forming a combustion area at one end of a gasification channel, wherein the combustion surface is called a flame working surface. The high temperature gas produced permeates forward along the gasification channel by the action of pressure and simultaneously transfers the heat carried by the gas to the surrounding coal bed. The injected gas reacts with the coal bed in situ to produce synthetic gas, the produced synthetic gas is produced from the production well, and the solid wastes such as ash, grindstone and the like are left underground. The produced gas is used for burning a boiler to generate electricity, and combined cycle power generation is realized.
The traditional mechanical mining mainly aims at coal seams with the depth of less than 1000 meters, but for the coal seams with the depth of more than 1000 meters, the mechanical mining has difficulty; the invention provides a mode of combining comprehensive utilization of a coal bed gas development well pattern, and realizes gasification development of deep coal by burning a deep coal bed.
Gasified coal gas (H) produced after coal gasification 2 、CH 4 、CO 2 、SO 2 Isomixe) has a large amount of CO 2 The carbon separation can be used for injecting the coal bed gas layer, performing desorption exploitation on the adsorbed gas of the coal bed gas layer, and injecting the adsorbed gas into an oil reservoir or a gas reservoir, so that the recovery ratio of the oil reservoir and the gas reservoir can be improved. When the gas well produces CO 2 After a molar percentage of more than 10%, CO is carried out 2 Sealing and reducing CO 2 And (5) discharging. CO produced by underground coal gasification 2 The waste gas is reinjected to the bottom of the natural gas reservoir, thereby not only realizing the improvement of the recovery ratio of the petroleum and the natural gas, but also achieving the purpose of sealing partial CO 2 The purpose of the method is to provide a good measure for energy conservation and emission reduction.
The present invention also provides an electronic device, comprising: a memory storing executable instructions; and the processor runs the executable instructions in the memory to realize the coalbed methane/coalbed integrated recovery method.
The invention also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the coalbed methane/coalbed integrated recovery method.
To facilitate understanding of the scheme of the embodiments of the present invention and the effects thereof, four specific application examples are given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
Example 1
Figure 4 shows a flow chart of the steps of a coal bed methane/coal bed integrated recovery method according to one embodiment of the present invention.
As shown in fig. 4, the coalbed methane/coalbed integrated recovery method comprises the following steps: 101, establishing a coal bed gas/coal bed integrated development well pattern; 102, performing depletion mining on the coal bed gas of the coal bed gas layer; 103, injecting a gasifying agent into the underground deep coal seam through an injection well, carrying out in-situ combustion reaction with the coal seam, and outputting synthetic gas from an output well; 104, converting CO in the synthesis gas 2 Injecting the coal bed gas layer, and performing desorption type exploitation on the adsorbed gas of the coal bed gas layer; 105, after the production of the adsorbed gas is finished, sealing the integrated development well pattern, and sealing CO 2 。
The method is applied to an E-shaped basin A block, and a combined development method of coal gasification, CO2 enhanced recovery and geological sequestration is systematically discussed.
The coal-bearing stratum Taiyuan group 1 coal seam and Shanxi group 2 coal seam are mainly arranged in the target area, and the interlayer spacing is 25-100 m. The transverse distribution in the area is stable, the thickness of the No. 1 coal seam is 1-15 m, and the thickness of the No. 2 coal seam is 0.2-20.0 m. According to the net thickness lower limit value (0.5-0.8 m) required in the coal bed gas resource reserve specification, 1# coal bed with the thickness of 1 is selected in the well pattern design of the areaAnd carrying out well position deployment in an area with the thickness of 15m and 2# coal seam of 0.5-20.0 m. The geological reserve of gas reservoir is 45 hundred million m 3 And the abundance of the coal bed gas resources ranges from 1m to 1.8m 3 /km 2 Average of 1.5m 3 /km 2 . Considering the development condition of the coal bed, the overlapping reserve abundance is 3.0m 3 /km 2 . The service period of a single gas reservoir well preliminarily designed by the development scheme is 30 years, wherein the coal bed gas is exploited for 15 years, and the coal gas is produced for 15 years. The coal bed gas stable production period is 8 years, and the average daily output of a single well in the stable production period is 2000m 3 And d, assuming that the recoverable reserves are recovered to 62.5% at the end of the steady production period and the gas reservoir recovery is 54%.
Evaluating the reasonable well spacing calculation of the coal bed gas according to a single well reasonable control storage method, wherein the single well control geological storage is 0.156 hundred million m 3 . According to the crack spreading characteristics, determining that theta is 60 degrees, and obtaining that the long-axis well spacing is 425m and the short axis is 245 m. The total cost of drilling and gas construction of a single well is 170 RMB/well, the gas well is transformed into a coal gas well, the current investment cost is reduced to 10 RMB/well, the annual average gas production operation cost of the single well is 16.7 RMB/year per well, the production year is 30 years, and the price of produced gas is 1.1 RMB/m 3 The recovery ratio of coal bed gas and coal gas is 0.54. 60% of the overlapping rate of the coal bed gas and coal gas reservoir in unit area; the economic limit reserve of the single well control is 0.07 hundred million m 3 Abundance of resources of 3.0 hundred million m 3 /km 2 Then the corresponding economic limit well spacing is 201m for the major axis and 116 m for the minor axis. Therefore, by combining the method, the reasonable well spacing of the coal gas and coal bed gas integrated well pattern is determined as that the well spacing of the long axis is 240m, and the well spacing of the short axis is 138 m.
In order to ensure the reserve control degree and the single well productivity of a production area, and synthesize factors such as structural characteristics, reservoir layer distribution, physical property change, reserve superposition degree and the like, an irregular development well pattern is adopted under the well pattern and well pattern control of the well pattern well spacing.
Figure 5 shows a schematic diagram of a coalbed methane/coal seam integrated development well pattern for an a-block coalbed methane development stage of the eruptor basin in accordance with one embodiment of the present invention.
Figure 6 shows a schematic diagram of a coal bed gas/coal bed integrated development well pattern for an a-block coal underground gasification integrated utilization stage of an erudos basin according to one embodiment of the present invention.
Figure 5 is a development well pattern for an a-block coalbed methane development stage of the erudos basin. Considering that the coal gasification process needs to be ignited at the bottom of a gas injection well, the existing well pattern is adjusted, and the gas injection well and a gas production well are deployed to form an integrated development well pattern for comprehensive utilization of underground coal gasification, as shown in fig. 6.
The coal is gasified underground for comprehensive utilization, and the coal gasification operation is carried out at the last stage of gas production of the coal bed gas. Igniting at the bottom of a gas well of a gas injection well, igniting by a gas inlet drum such as air and the like, and forming a combustion area at one end of a gasification channel, wherein the combustion surface is called a flame working surface. The high temperature gas produced permeates forward along the gasification channel by the action of pressure and simultaneously transfers the heat carried by the gas to the surrounding coal bed. The injected gas reacts with the coal bed in situ to produce synthetic gas, the produced synthetic gas is produced from the production well, and the solid wastes such as ash, grindstone and the like are left underground. The produced gas is used for burning a boiler to generate electricity, and combined cycle power generation is realized.
Gasified coal gas (H) produced after coal gasification 2 、CH 4 、CO 2 、SO 2 Isomixe) has a large amount of CO 2 The carbon is separated and injected into an oil reservoir or a gas reservoir, so that the recovery ratio of the oil reservoir or the gas reservoir can be improved. When the gas well produces CO 2 After a molar percentage of more than 10%, CO is carried out 2 Sealing and reducing CO 2 And (5) discharging.
Example 2
Figure 7 illustrates a block diagram of a coal bed methane/coal bed integrated recovery device according to one embodiment of the present invention.
As shown in fig. 7, the coalbed methane/coalbed integrated recovery device comprises:
a network building module 201, which is used for building a coal bed gas/coal bed integrated development well network;
the coal bed gas mining module 202 is used for performing depletion mining on the coal bed gas of the coal bed gas layer;
the coal bed reaction module 203 is used for injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and producing synthetic gas from the production well;
a coal bed gas re-extraction module 204 for recovering CO from the syngas 2 Injecting the coal bed gas layer, and performing desorption type exploitation on the adsorbed gas of the coal bed gas layer;
the sealing module 205 seals the integrated development well pattern and seals CO after the production of the adsorbed gas is finished 2 。
As a preferred scheme, the coal bed gas/coal bed integrated development well pattern is a diamond well pattern.
As a preferred scheme, the long side direction of the rhombic well pattern is parallel to the leading direction of a natural fracture or parallel to the direction of an artificial fracturing fracture, the injection well is arranged at the top point of the rhombic well pattern, and the production well is arranged at the center point in the rhombic well pattern.
Preferably, the determining the well spacing of the diamond-shaped well pattern comprises:
calculating the economic limit reserves of single well control;
and calculating the well spacing according to the economic limit reserves of single well control.
Preferably, the economic limit reserves of single well control are calculated by the formula (1):
G g ＝G gm +k×G gz (1)
wherein G is g For individual well control of economic ultimate reserves, G gm The economic limit reserves of the coal bed gas are controlled for a single well,
G gz for controlling the economic limit reserves of coal gas production for a single well,
k is the overlapping rate of coal bed gas and coal gas reservoir in unit area, C 1 Total cost for single well drilling and gas construction, C 2 Conversion of gas wells to coal-to-gas wells to current investment costs, P 1 The annual average gas production operation cost T of the coal bed gas single well 1 Is the coal bed gas production age, P 2 The annual average gas production operation cost T of the coal gas production single well 2 For the coal gas production life, A g For selling the price of coal bed gas, A gz Is coalGas-making selling price, E rm For recovery of coal bed gas, E rz The recovery ratio of coal gas production is obtained.
Preferably, the calculating the well spacing comprises:
wherein F is the abundance of resources, Dx and Dy are the major axis and the minor axis of the diamond well pattern, and theta is the included angle of the diamond well pattern.
Preferably, CO is injected 2 At the end of increasing the recovery ratio of the hydrocarbon reservoir, CO is applied 2 Sealing and reducing CO 2 And (4) discharging.
Example 3
The present disclosure provides an electronic apparatus including: a memory storing executable instructions; and the processor runs the executable instructions in the memory to realize the coal bed gas/coal bed integrated recovery method.
An electronic device according to an embodiment of the present disclosure includes a memory and a processor.
The memory is to store non-transitory computer readable instructions. In particular, the memory may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, Random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, Read Only Memory (ROM), hard disk, flash memory, etc.
The processor may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In one embodiment of the disclosure, the processor is configured to execute the computer readable instructions stored in the memory.
Those skilled in the art should understand that, in order to solve the technical problem of how to obtain a good user experience, the present embodiment may also include well-known structures such as a communication bus, an interface, and the like, and these well-known structures should also be included in the protection scope of the present disclosure.
For the detailed description of the present embodiment, reference may be made to the corresponding descriptions in the foregoing embodiments, which are not repeated herein.
Example 4
The embodiment of the disclosure provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the coalbed methane/coalbed integrated recovery method.
A computer-readable storage medium according to an embodiment of the present disclosure has non-transitory computer-readable instructions stored thereon. The non-transitory computer readable instructions, when executed by a processor, perform all or a portion of the steps of the methods of the embodiments of the disclosure previously described.
The computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROMs and DVDs), magneto-optical storage media (e.g., MOs), magnetic storage media (e.g., magnetic tapes or removable disks), media with built-in rewritable non-volatile memory (e.g., memory cards), and media with built-in ROMs (e.g., ROM cartridges).
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A coal bed gas/coal bed integrated recovery method is characterized by comprising the following steps:
establishing a coal bed gas/coal bed integrated development well pattern;
performing depletion mining on the coal bed gas of the coal bed gas layer;
injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and outputting the synthetic gas from the output well;
converting CO in the synthesis gas 2 Injecting the coal bed gas layer, and performing desorption type mining on the adsorbed gas of the coal bed gas layer;
after the production of the adsorbed gas is finished, the integrated development well pattern is sealed and CO is sealed and stored 2 。
2. The coalbed methane/coal seam integrated recovery method of claim 1 wherein the coalbed methane/coal seam integrated development well pattern is a diamond well pattern.
3. A coal bed methane/coal bed integrated recovery method according to claim 2, wherein the direction of the long side of the diamond-shaped well pattern is parallel to the direction of the natural fracture dominance or the direction of the artificial fracture, the injection well is arranged at the vertex of the diamond-shaped well pattern, and the production well is arranged at the inner central point of the diamond-shaped well pattern.
4. A coalbed methane/coal seam integrated recovery method as defined in claim 2, wherein determining the well spacing of the diamond-shaped well pattern comprises:
calculating the economic limit reserves of single well control;
and calculating the well spacing according to the single-well control economic limit reserves.
5. A coalbed methane/coal seam integrated recovery method as defined in claim 4 wherein the individual well control economic limit reserve is calculated by equation (1):
G g ＝G gm +k×G gz (1)
wherein, G g For individual well control of economic ultimate reserves, G gm The economic limit reserves of the coal bed gas are controlled for a single well,
G gz for controlling the economic limit reserves of coal gas production for a single well,
k is the overlapping rate of coal bed gas and coal gas reservoir in unit area, C 1 Total cost for single well drilling and gas construction, C 2 Conversion of gas wells to coal-to-gas wells to current investment costs, P 1 The annual average gas production operation cost, T, of the coal bed gas single well 1 Is the coal bed gas production age, P 2 The annual average gas production operation cost T of the coal gas production single well 2 For the coal gas production life, A g For selling the price of coal bed gas, A gz Selling price for coal gas, E rm For recovery of coal bed gas, E rz The recovery ratio of coal gas production is obtained.
6. The integrated coalbed methane/coal seam recovery method of claim 5, wherein calculating the well spacing comprises:
wherein F is the abundance of resources, Dx and Dy are the major axis and the minor axis of the diamond well pattern, and theta is the included angle of the diamond well pattern.
7. The integrated coalbed methane/coal seam recovery method of claim 1, further comprising:
converting CO in the synthesis gas 2 And the oil-gas mixture is injected into an oil reservoir or a gas reservoir to improve the recovery ratio of the oil-gas reservoir.
8. The utility model provides a coal bed gas coal seam integration recovery unit which characterized in that includes:
the network building module is used for building a coal bed gas/coal bed integrated development well network;
the coal bed gas mining module is used for carrying out exhaustion type mining on the coal bed gas of the coal bed gas layer;
the coal bed reaction module is used for injecting a gasifying agent into the underground deep coal bed through the injection well, carrying out in-situ combustion reaction with the coal bed, and outputting synthetic gas from the output well;
a coal bed gas re-mining module for recovering CO in the synthesis gas 2 Injecting the coal bed gas layer, and performing desorption type mining on the adsorbed gas of the coal bed gas layer;
a sealing module for sealing the integrated development well pattern and sealing CO after the production of the adsorbed gas is finished 2 。
9. An electronic device, characterized in that the electronic device comprises:
a memory storing executable instructions;
a processor executing the executable instructions in the memory to implement the integrated coalbed methane/coal seam recovery method of any one of claims 1-7.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which when executed by a processor, implements the integrated coal bed methane/coal bed recovery method of any one of claims 1-7.
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| CN116575900B (en) * | 2023-07-07 | 2023-09-15 | 太原理工大学 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
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