CN103470223A - Low-carbon co-mining method and system for fossil energy - Google Patents
Low-carbon co-mining method and system for fossil energy Download PDFInfo
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- CN103470223A CN103470223A CN201310433758XA CN201310433758A CN103470223A CN 103470223 A CN103470223 A CN 103470223A CN 201310433758X A CN201310433758X A CN 201310433758XA CN 201310433758 A CN201310433758 A CN 201310433758A CN 103470223 A CN103470223 A CN 103470223A
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- 238000000034 method Methods 0.000 title claims abstract description 74
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 29
- 238000005065 mining Methods 0.000 title claims abstract description 6
- 239000003245 coal Substances 0.000 claims abstract description 300
- 238000002309 gasification Methods 0.000 claims abstract description 184
- 239000003921 oil Substances 0.000 claims abstract description 147
- 239000010779 crude oil Substances 0.000 claims abstract description 66
- 238000000926 separation method Methods 0.000 claims abstract description 54
- 238000000746 purification Methods 0.000 claims abstract description 30
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims description 436
- 230000015572 biosynthetic process Effects 0.000 claims description 145
- 239000000203 mixture Substances 0.000 claims description 121
- 230000008676 import Effects 0.000 claims description 68
- 239000003129 oil well Substances 0.000 claims description 64
- 239000002699 waste material Substances 0.000 claims description 61
- 239000003795 chemical substances by application Substances 0.000 claims description 50
- 239000000567 combustion gas Substances 0.000 claims description 49
- 239000000126 substance Substances 0.000 claims description 41
- 239000002912 waste gas Substances 0.000 claims description 39
- 238000003786 synthesis reaction Methods 0.000 claims description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 26
- 238000007569 slipcasting Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002737 fuel gas Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 238000005422 blasting Methods 0.000 claims description 12
- 230000009466 transformation Effects 0.000 claims description 12
- 239000000284 extract Substances 0.000 claims description 11
- 238000011049 filling Methods 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
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- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 238000000197 pyrolysis Methods 0.000 claims description 7
- 230000002706 hydrostatic effect Effects 0.000 claims description 5
- 238000002513 implantation Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
- 230000002459 sustained effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 7
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004177 carbon cycle Methods 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
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- 239000003034 coal gas Substances 0.000 description 3
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Abstract
The invention discloses a low-carbon co-mining method and system for fossil energy. The method comprises the following steps of: collecting coal seam mixing gas in a coal seam, separating CO2 gas from the coal seam mixed gas, pumping the separated CO2 gas into an oil seam and/or gas seam, so that crude oil in the oil seam is discharged by CO2 gas, a gas seam mixed gas is discharged by the pumped CO2 gas; and then respectively collecting the discharged crude oil and the discharged gas seam mixed gas. The system comprises an underground gasification unit, wherein a coal seam mixed gas outlet of the underground gasification unit is communicate with a coal seam mixed gas inlet of a purification and separation unit, and a CO2 gas outlet of the purification and separation unit is communicated with the upstream part of the oil seam and/or the upstream part of the gas seam through a pressurizing unit. According to the method and system provided by the invention, the crude oil or gas can be discharged out by fully utilizing the local CO2 gas, and the CO2 gas does not need to be discharged into air, so that the environment can not be polluted, and thus the beneficial effect of low-carbon mining of fossil energy is realized.
Description
Technical field
The present invention relates to fossil energy production technique field, relate in particular to a kind of zone that coal seam and oil reservoir and/or gas-bearing formation are coexisted and carry out the method and system that the fossil energy low-carbon (LC) is adopted altogether.
Background technology
Fossil energy mainly contains coal, crude oil and combustion gas, along with superficial part (1000 meters with shallow) coal resources and medium to high permeable oil reservoir resource consume gradually, the exploitation of deep (1000 meters with dark) coal resources, viscous crude resource and combustion gas resource more and more is subject to the attention of countries in the world.And many regional coal seams, oil reservoir and gas-bearing formation exist in deep simultaneously, coal seam is on top, and oil reservoir and gas-bearing formation are in bottom.
According to the Third National coal resources, predict the outcome: national vertical depth 2000m be take shallow prognostic resources, and as 4.55Tt, vertical depth 1000m, to take shallow be 1.84Tt, and what the coal resources buried depth was greater than 1000m accounts for 59.5% of whole nation prediction total amount.Due to deep temperature, the rising of pressing, the well work is difficult to exploitation, therefore at present the exploitation of deepen coal resource is not still possessed to ripe production technique, yet utilizes coal underground gasification technology can realize the purpose that traditional coal winning technology can't be realized.Underground coal gasification(UCG) (Underground Coal Gasification, UCG) will controlledly be burnt in underground coal, produces the technology of new generation of fuel gas by the heat effect to coal and chemical action.Underground coal gasification(UCG) coal gas main component has: H
2, CO, CH
4, CO
2, H wherein
2, CO, CH
4be available gas, can be used as fuel or chemical industry synthesis gas, and CO
2for waste gas, account for 20%～40%, in the prior art, these CO
2gas is deposited nowhere, can only be discharged into atmosphere and contaminated environment.
In world's crude resources reserves, heavy oil reserves is occupied very large proportion, but exploitation effect is generally bad, and recovery ratio is lower.How can better heavy crude producing, improve the recovery ratio of viscous crude, be the important topic of research at present.Approximately 63.2 hundred million tons of China's low-permeability oil gas reservoirs, still have 50% left and right not employ, the hyposmosis resource of employing, and due to the restriction of technical level, average recovery ratio is only 23.3%.The viscous crude flow resistance is large, for the viscous crude in oil reservoir, usually takes the heating exploitation method.From nineteen fifty, many countries at laboratory and scene all to CO
2improve the recovery ratio method and carried out the research of considerable scale.The seventies, the country such as the U.S. and former Soviet Union all carried out a large amount of CO
2displacement of reservoir oil type approval test, the eighties CO
2the displacement of reservoir oil has obtained development at full speed in the U.S..Other countries are to CO simultaneously
2the interest of the displacement of reservoir oil is also more and more higher, the CO of the nineties
2technology of reservoir sweep reaches its maturity.The U.S. is at CO
2the abundant area of source of the gas has extensively adopted CO
2the displacement of reservoir oil, and think most potential raising recovery ratio method.Current CO
2the displacement of reservoir oil improves recovery efficiency technique and has become the world three large oil production method (thermal recovery, polymer displacement of reservoir oil and CO
2one of the displacement of reservoir oil).Practice shows, carbon dioxide drive can improve oil recovery rate 10% ~ 20%.After carbon dioxide is injected into oil reservoir, approximately have 50% ~ 60% by permanent envelope, be stored in underground.Therefore, the viscous crude resource exploitation needs a large amount of CO
2.All adopt at present the method for outward transport to solve.
At 1000 meters, with deeply, many regional coal seams and oil reservoir often exist simultaneously, as the Junggar Basin, Xinjiang, china east, the Jimusaer Sag district degree of depth at 1200 meters～1800 meters containing coal seam, at 2000 meters～2500 meters oil-bearing layer; The Liaohe Oil Field little Long Wan oil district degree of depth contains coal seam at 1200 meters～1600 meters, at 1800 meters～2500 meters oil-bearing layer.Gas-bearing bed is gone back in some zone, and coal seam is all at oil reservoir with above gas-bearing formation, and oil well and gas well are all through coal seam.
In prior art, the exploitation of coal, crude oil and combustion gas is all carried out separately separately.Isolated CO in the process that gathers coal, crude oil or combustion gas
2gas is deposited nowhere and can only directly be discharged into atmosphere and contaminated environment.Oil reservoir and gas-bearing formation be through exploitation for many years, and many oil wells and gas well be because taking out not fuel-displaced scrapping, but also have a certain amount of Residual oil and residual gas in oil reservoir and gas-bearing formation.Although can utilize CO
2again drive and adopt, can make OW be re-used, the service life of Yanchang Oilfield still, directly extracts CO from air
2gas efficiency is too low, adopts outward transport CO
2the method of gas has increased again cost of transportation greatly, from overall consideration, loses more than gain.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method that fossil energy low-carbon (LC) is adopted altogether.Use can not will a large amount of CO of the method
2gas discharging to atmosphere and contaminated environment, needn't adopt outward transport CO
2the method of gas can exploit out by crude oil and combustion gas, has greatly reduced cost of production.
Another technical problem that the present invention will solve is to provide the system that a kind of fossil energy low-carbon (LC) is adopted altogether.Use can not will a large amount of CO of this system
2gas discharging, needn't be by outward transport CO to atmosphere and contaminated environment
2gas can be exploited out by crude oil and combustion gas, has greatly reduced cost of production.
With regard to method, in order to solve the problems of the technologies described above, the method that a kind of fossil energy low-carbon (LC) provided by the invention is adopted altogether, the zone coexisted at coal seam and oil reservoir and/or gas-bearing formation, gather coal seam Zhong coal seam air mixture, by the CO in the air mixture of coal seam
2gas is separated, by the CO separated
2gas is pressed in oil reservoir and/or gas-bearing formation, the bulged-in CO of the crude oil in oil reservoir
2gas is discharged, the bulged-in CO of gas-bearing formation air mixture in gas-bearing formation
2gas is discharged, and gathers respectively the crude oil of discharge and the gas-bearing formation air mixture of discharge.
The Zhong coal seam air mixture of described collection coal seam is in underground generation coal seam air mixture by the underground gasification method; Described underground gasification method is the oxygen to gasification tunnel implantation temperature Approaching Coal Seam burning-point in coal seam, the coal seam forced oxidation is lighted, coal seam is lighted rear continuation and is injected normal temperature oxygen to gasification tunnel in coal seam, simultaneously to injected gas agent in coal seam, gas injection pressure is less than local coal seam hydrostatic pressure, makes coal seam sustained combustion, gasification, pyrolysis and produce to contain H
2, CO, CH
4, CO
2the coal seam air mixture; The air mixture of described coal seam goes out by waste oil well and/or the waste gas well array be communicated with coal seam.
From the close-by examples to those far off push ahead step by step in the zone at the crude oil place that described collection is discharged, from the close-by examples to those far off push ahead step by step in the zone of the gas-bearing formation air mixture that described collection is discharged, push ahead simultaneously in the zone of the gas-bearing formation air mixture that the zone at the crude oil place that perhaps, described collection is discharged and described collection are discharged; Correspondingly, the zone of described collection coal seam Zhong coal seam air mixture follows the back in the zone of the zone at the crude oil place of discharging in described collection and/or the gas-bearing formation air mixture that described collection is discharged synchronously to push ahead.
To isolate CO
2after gas, the part of the effective combustion gas in gained coal seam is for generating; To isolate CO
2after gas, another part of the effective combustion gas in gained coal seam is for the synthesis of natural gas and/or oil product; By the CO carried secretly in crude oil
2gas is separated and is obtained oil product; By the CO sneaked in the gas-bearing formation air mixture
2gas is separated and is obtained the effective combustion gas of gas-bearing formation.
The water vapour H produced from the process of generating
2o is for gathering coal seam Zhong coal seam air mixture; The water vapour H produced from the process of synthetic natural gas and/or oil product
2o is for gathering coal seam Zhong coal seam air mixture; The CO separated from crude oil
2gas is for gathering coal seam Zhong coal seam air mixture; The CO separated from the gas-bearing formation air mixture
2gas is for gathering coal seam Zhong coal seam air mixture; The tail gas produced from the process of synthetic natural gas and/or oil product is for generating.
Method of the present invention compared with prior art has following beneficial effect.
1, the technical program is owing to having adopted the CO will separated
2gas is pressed into the technological means in oil reservoir and/or gas-bearing formation, so the crude oil in oil reservoir can bulged-in CO
2gas is discharged, and the gas-bearing formation air mixture in gas-bearing formation can bulged-in CO
2gas is discharged.Be pressed into the CO in oil reservoir
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2gas is discharged oil reservoir (this part CO together with crude oil
2gas will further be recycled in improvement below).Be pressed into the CO in gas-bearing formation
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2discharge gas-bearing formation (this part CO in gas and gas-bearing formation after combustion gas mixing
2gas will further be recycled in improvement below).As can be seen here, not only can gather materials on the spot and take full advantage of CO by the method for adopting altogether
2gas is discharged crude oil or combustion gas, needn't adopt outward transport CO
2the method of gas can exploit out by crude oil (comprising viscous crude) and combustion gas, has greatly reduced cost of production, is conducive to gather more up hill and dale the crude oil of discharge and the combustion gas of discharge, and, give again CO
2gas finds a permanent place of taking shelter, can be by CO
2gas is discharged in atmosphere, avoids contaminated environment, has realized the beneficial effect of low-carbon (LC) exploitation fossil energy.
2, the technical program is the technological means of also by waste oil well and/or waste gas well, the coal seam air mixture being discharged in underground generation coal seam air mixture by the underground gasification method owing to having adopted collection coal seam Zhong coal seam air mixture, so, can reduce costs further.Again owing to having adopted to the oxygen of gasification tunnel implantation temperature Approaching Coal Seam burning-point in coal seam, the coal seam forced oxidation is lighted, coal seam is lighted rear continuation and is injected normal temperature oxygen to gasification tunnel in coal seam, simultaneously to injected gas agent in coal seam, gas injection pressure is less than local coal seam hydrostatic pressure, makes coal seam sustained combustion, gasification, pyrolysis and produce to contain H
2, CO, CH
4, CO
2the technological means of coal seam air mixture, so, but utmost point in-situ generation coal seam air mixture simply further reduces costs.
3, the technical program is owing to having adopted the zone that gathers the crude oil place of discharging from the close-by examples to those far off to push ahead step by step, from the close-by examples to those far off push ahead step by step in the zone that gathers the gas-bearing formation air mixture of discharging, and push ahead with the zone that gathers the gas-bearing formation air mixture of discharging simultaneously in the zone that gathers the crude oil place of discharging; Correspondingly, gather the technological means that zone is followed in the zone that gathers the crude oil place of discharging and/or synchronously push ahead the back in the zone of the gas-bearing formation air mixture of described collection discharge of coal seam Zhong coal seam air mixture, so, not only can be conducive to whole coal, crude oil and combustion gas in the zone that coal seam and oil reservoir and/or gas-bearing formation coexist gathered more up hill and dale, and, can utilize more fully waste oil well and/or waste gas well, reduce production costs widely.
4, the technical program will be isolated CO owing to having adopted
2after gas, the part of the effective combustion gas in gained coal seam is for the technological means of generating, so, can introduce external electric energy driving arrangement, realization is gathered materials on the spot, driving arrangement on the spot generates electricity, self-sufficient, circulation is produced, and has removed the laying of very long transmission line of electricity from, greatly saved circuit cost, for the well-digging construction provides larger convenience.To isolate CO owing to having adopted again
2after gas, another part of the effective combustion gas in gained coal seam is for the synthesis of natural gas and/or oil product; By the CO carried secretly in crude oil
2gas is separated and is obtained oil product; By the CO sneaked in the gas-bearing formation air mixture
2gas is separated the technological means that obtains the effective combustion gas of gas-bearing formation, so, not only can on the spot Raw material processing be become to primary product, and further optimize advantage is provided below can be.
5, the technical program is owing to having adopted the water vapour H produced from the process of generating
2o is for gathering coal seam Zhong coal seam air mixture, the water vapour H produced from the process of synthetic natural gas and/or oil product
2o is for gathering coal seam Zhong coal seam air mixture, the CO separated from crude oil
2gas is for gathering coal seam Zhong coal seam air mixture, the CO separated from the gas-bearing formation air mixture
2gas is for gathering coal seam Zhong coal seam air mixture, and the tail gas produced from the process of synthetic natural gas and/or oil product (wherein comprises available gas H
2, CO, CH
4) for the generating technological means, so, realized water vapour H
2o and CO
2recycling of gas, turn waste into wealth, and is conducive to the unlimited generation of gasifying agent.
With regard to product, in order to solve above-mentioned another technical problem, the system that a kind of fossil energy low-carbon (LC) provided by the invention is adopted altogether, this system is positioned at the zone that coal seam and oil reservoir and/or gas-bearing formation coexist, and comprises gasification unit; Described gasification unit is provided with gasifying agent import and coal seam air mixture outlet; The coal seam air mixture outlet of described gasification unit is communicated with the coal seam air mixture import of purification separation unit; Described purification separation unit is provided with the effective gas outlet in coal seam and CO
2gas vent; The CO of described purification separation unit
2gas vent is communicated with oil reservoir upstream and/or gas-bearing formation upstream by presser unit.
Described gasification unit is the underground gasification unit; Described underground gasification unit comprises the gasification tunnel be arranged in coal seam; One end of described gasification tunnel is provided with described gasifying agent import; The other end of described gasification tunnel is provided with the air mixture outlet of described coal seam; The air mixture outlet of described coal seam is formed by waste oil well and/or the transformation of waste gas well; Described being formed by the transformation of waste oil well is that the bottom near this waste oil well is provided with stop grouting plug in the oil pipe of described waste oil well; To grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; To the oil pipe tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms combustion gas condensate warehouse to the cavity between described slip casting end face; Described being formed by the transformation of waste gas well is that the bottom near this waste gas well is provided with stop grouting plug in the tracheae of described waste gas well; To grouting filling in tracheae; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; To the tracheae tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms combustion gas condensate warehouse to the cavity between described slip casting end face.
Described gasification tunnel has a plurality of; A plurality of described gasification tunnels are shape being horizontally disposed with linearly; One end of a plurality of described gasification tunnels is interconnected and shares a gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to any gasification tunnel in described vertically-oriented well, the lateral wall on described continuous flexible pipe top is connected with the top seal of described vertically-oriented well, and the top of described vertically-oriented well has steam H
2o and CO
2the import of gas, the initial distance between the outlet of described continuous flexible pipe bottom and the other end of described gasification tunnel is 20-80m; The other end of a plurality of described gasification tunnels is communicated to respectively described waste oil well or waste gas well; Perhaps, the other end of a plurality of described gasification tunnels is interconnected and shares a waste oil well or waste gas well; One end of a plurality of described gasification tunnels is respectively arranged with the gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to gasification tunnel in each described vertically-oriented well, the lateral wall on each described continuous flexible pipe top is connected with the top seal of the vertically-oriented well in place, and the top of each described vertically-oriented well all has steam H
2o and CO
2the import of gas, the initial distance between the outlet of each described continuous flexible pipe bottom and the corresponding described gasification tunnel other end is 20-80m.
Described system also comprises generator unit and chemical industry synthesis unit; Described generator unit is provided with the effective fuel gas inlet in coal seam; Described chemical industry synthesis unit is provided with the effective fuel gas inlet in coal seam; The effective gas outlet in coal seam of described purification separation unit is communicated with the effective fuel gas inlet in coal seam of the effective fuel gas inlet in the coal seam of generator unit and chemical industry synthesis unit respectively; Described oil reservoir downstream is communicated with the crude oil import of Oil-gas Separation unit; Described gas-bearing formation downstream is communicated with the gas-bearing formation air mixture import of gas gas separative element.
Described chemical industry synthesis unit is provided with steam H
2o outlet and tail gas outlet; Described generator unit is provided with steam H
2o outlet and tail gas import; The steam H of described chemical industry synthesis unit
2the steam H of O outlet and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The steam H of described generator unit
2the steam H of O outlet and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The tail gas outlet of described chemical industry synthesis unit is communicated with the tail gas import of described generator unit; Described Oil-gas Separation unit is provided with CO
2gas vent; The CO of described Oil-gas Separation unit
2the steam H of gas vent and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; Described gas gas separative element is provided with CO
2gas vent; The CO of described gas gas separative element
2the steam H of gas vent and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with.
System of the present invention compared with prior art has following beneficial effect.
1, the technical program is due to the CO that has adopted the purification separation unit
2the technological means that gas vent is communicated with oil reservoir upstream and/or gas-bearing formation upstream by presser unit, so the crude oil in oil reservoir can bulged-in CO
2gas is discharged, and the gas-bearing formation air mixture in gas-bearing formation can bulged-in CO
2gas is discharged.Be pressed into the CO in oil reservoir
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2gas is discharged oil reservoir (this part CO together with crude oil
2gas will further be recycled in improvement below).Be pressed into the CO in gas-bearing formation
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2discharge gas-bearing formation (this part CO in gas and gas-bearing formation after combustion gas mixing
2gas will further be recycled in improvement below).As can be seen here, not only can gather materials on the spot and take full advantage of CO by the system of adopting altogether
2gas is discharged crude oil or combustion gas, needn't adopt outward transport CO
2the method of gas can exploit out by crude oil (comprising viscous crude) and combustion gas, has greatly reduced cost of production, is conducive to gather more up hill and dale the crude oil of discharge and the combustion gas of discharge, and, give again CO
2gas finds a permanent place of taking shelter, can be by CO
2gas is discharged in atmosphere, avoids contaminated environment, has realized the beneficial effect of low-carbon (LC) exploitation fossil energy.Again due to the technological means that has adopted gasification unit, so, cost of production saved widely.Also, owing to having adopted gasification unit to be provided with gasifying agent import and coal seam air mixture outlet, the coal seam air mixture outlet of gasification unit is communicated with the coal seam air mixture import of purification separation unit, and the purification separation unit is provided with the effective gas outlet in coal seam and CO
2the technological means of gas vent, so, for following improvement provides advantage.
2, the technical program is the underground gasification unit owing to having adopted gasification unit, the underground gasification unit comprises the gasification tunnel be arranged in coal seam, one end of gasification tunnel is provided with described gasifying agent import, the other end of gasification tunnel is provided with the air mixture outlet of described coal seam, the technological means that coal seam air mixture outlet is formed by waste oil well and/or the transformation of waste gas well, so, can greatly reduce the construction cost of underground gasification unit.Again owing to having adopted the bottom near this waste oil well in the oil pipe of waste oil well to be provided with stop grouting plug; To grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; To the oil pipe tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms the technological means of combustion gas condensate warehouse to described slip casting end face, so construction is more prone to.Similarly, adopted the bottom near this waste gas well in the tracheae of waste gas well to be provided with stop grouting plug; To grouting filling in tracheae; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; To the tracheae tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms the technological means of combustion gas condensate warehouse to described slip casting end face, construction also is more prone to.
3, the technical program is a plurality of owing to having adopted gasification tunnel to have; A plurality of gasification tunnels are shape being horizontally disposed with linearly; One end of a plurality of gasification tunnels is interconnected and shares a gasifying agent import, the gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to any gasification tunnel in vertically-oriented well, the lateral wall of continuous flexible pipe is connected with the top seal of vertically-oriented well, and the top of vertically-oriented well has steam H
2o and CO
2the import of gas, the other end of a plurality of gasification tunnels is communicated to respectively the technological means of waste oil well or waste gas well, so, can pass through waste oil well or the waste gas well construction horizontal orientation well of a vertically-oriented well to different orientation, greatly saved construction cost.When the other end that has adopted a plurality of gasification tunnels is interconnected and shares a waste oil well or waste gas well, one end of a plurality of gasification tunnels is respectively arranged with the gasifying agent import, the gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to gasification tunnel in each vertically-oriented well, the lateral wall of each continuous flexible pipe is connected with the top seal of the vertically-oriented well in place, and the top of each vertically-oriented well all has steam H
2o and CO
2the technological means of the import of gas, not only can save construction cost widely, and, the coal seam air mixture in each gasification tunnel can be concentrated and discharged, be conducive to enhance productivity.
4, the technological means that the technical program is communicated with the effective fuel gas inlet in coal seam of the effective fuel gas inlet in the coal seam of generator unit and chemical industry synthesis unit respectively due to the effective gas outlet in coal seam that has adopted the purification separation unit, so, can introduce external electric energy driving arrangement, realization is gathered materials on the spot, driving arrangement on the spot generates electricity, self-sufficient, circulation is produced, and has removed the laying of very long transmission line of electricity from, greatly saved circuit cost, for wellbore construction provides larger convenience.
5, the technical program is due to the steam H that has adopted generator unit
2the steam H of O outlet and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The steam H of chemical industry synthesis unit
2the steam H of O outlet and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The CO of Oil-gas Separation unit
2the steam H of gas vent and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The CO of gas gas separative element
2the steam H of gas vent and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The technological means that the tail gas outlet of chemical industry synthesis unit is communicated with the tail gas import of generator unit, so, realized water vapour H
2o and CO
2recycling of gas, turn waste into wealth, and is conducive to the unlimited generation of gasifying agent.
The accompanying drawing explanation
The method and system of fossil energy low-carbon (LC) of the present invention being adopted altogether below in conjunction with the drawings and specific embodiments is described in further detail.
Fig. 1 is system syndeton and the workflow schematic diagram that fossil energy low-carbon (LC) of the present invention is adopted altogether.
Fig. 2 is the system distribution schematic diagram on the ground that fossil energy low-carbon (LC) of the present invention is adopted altogether.
Fig. 3 is A-A line step profile structural representation in Fig. 2.
The specific embodiment
As shown in Figure 1 to Figure 3, the invention provides a kind of method that fossil energy low-carbon (LC) is adopted altogether, in coal seam 20 and (as can be seen from Figure 3, this zone is followed successively by from top to bottom: topsoil 11, mantlerock 12,20,Zhong rock stratum, coal seam 13, gas-bearing formation 8, lower rock stratum 14 and oil reservoir 7 in oil reservoir 7 and/or gas-bearing formation 8 zone that coexists.Certainly, this zone can be also the structure of other distribution, as coal seam 20, gas-bearing formation 8, oil reservoir 7 are positioned at the structure of the mutual adjacent distributions of same level substantially), gather coal seam 20Zhong coal seam air mixture, by the CO in the air mixture of coal seam
2gas is separated, by the described underground gasification method in back (certainly, also can by traditional gasification process) by the CO separated
2gas is pressed in oil reservoir 7 and/or gas-bearing formation 8, the bulged-in CO of the crude oil in oil reservoir 7
2gas is discharged, the bulged-in CO of gas-bearing formation air mixture in gas-bearing formation 8
2gas is discharged, and gathers respectively the crude oil of discharge and the gas-bearing formation air mixture of discharge.
Present embodiment is owing to having adopted the CO will separated
2gas is pressed into the technological means in oil reservoir and/or gas-bearing formation, so the crude oil in oil reservoir can bulged-in CO
2gas is discharged, and the gas-bearing formation air mixture in gas-bearing formation can bulged-in CO
2gas is discharged.Be pressed into the CO in oil reservoir
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2gas is discharged oil reservoir (this part CO together with crude oil
2gas will further be recycled in improvement below).Be pressed into the CO in gas-bearing formation
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2discharge gas-bearing formation (this part CO in gas and gas-bearing formation after combustion gas mixing
2gas will further be recycled in improvement below).As can be seen here, not only can gather materials on the spot and take full advantage of CO by the method for adopting altogether
2gas is discharged crude oil or combustion gas, needn't adopt outward transport CO
2the method of gas can exploit out by crude oil (comprising viscous crude) and combustion gas, has greatly reduced cost of production, is conducive to gather more up hill and dale the crude oil of discharge and the combustion gas of discharge, and, give again CO
2gas finds a permanent place of taking shelter, can be by CO
2gas is discharged in atmosphere, avoids contaminated environment, has realized the beneficial effect of low-carbon (LC) exploitation fossil energy.
As a kind of improvement of present embodiment, as shown in Figures 2 and 3, the 20Zhong coal seam air mixture of described collection coal seam is the coal seam air mixture to be discharged in underground generation coal seam air mixture and by waste oil well and/or waste gas well by the underground gasification method.
Present embodiment is the technological means of also by waste oil well and/or waste gas well, the coal seam air mixture being discharged in underground generation coal seam air mixture by the underground gasification method owing to having adopted collection coal seam Zhong coal seam air mixture, like this, just need not out transport coal mining to ground is gasified to coal again, by waste oil well and/or waste gas well, the coal seam air mixture is discharged, saved the operation that gets out gas well, so, can reduce costs further.Certainly, also can use conventional methods and gather coal seam Zhong coal seam air mixture.
As present embodiment, further improve, as shown in Figure 2, the zone (being oil well air inlet port 71 and oil well oil-out 72) at the crude oil place that described collection is discharged from the close-by examples to those far off advances to the right step by step, the zone (being gas well air inlet port 81 and gas well gas outlet 82) of the gas-bearing formation air mixture that described collection is discharged from the close-by examples to those far off advances to the right step by step, perhaps, the zone (being gas well air inlet port 81 and gas well gas outlet 82) of the gas-bearing formation air mixture that the zone (being oil well air inlet port 71 and oil well oil-out 72) at the crude oil place that described collection is discharged and described collection are discharged advances to the right simultaneously, correspondingly, the zone of the coal seam air mixture in described collection coal seam 2 (being gasifying agent import 22 and coal seam air mixture outlet 23) follows the back in the zone of the zone at the crude oil place of discharging in described collection and/or the gas-bearing formation air mixture that described collection is discharged synchronously to advance to the right.Certainly, above-mentioned progradation can be also to advance, boost, advance (with respect to Fig. 2) left downwards.
Present embodiment is owing to having adopted the zone that gathers the crude oil place of discharging from the close-by examples to those far off to push ahead step by step, from the close-by examples to those far off push ahead step by step in the zone that gathers the gas-bearing formation air mixture of discharging, and push ahead with the zone that gathers the gas-bearing formation air mixture of discharging simultaneously in the zone that gathers the crude oil place of discharging; Correspondingly, gather the technological means that zone is followed in the zone that gathers the crude oil place of discharging and/or synchronously push ahead the back in the zone of the gas-bearing formation air mixture of described collection discharge of coal seam Zhong coal seam air mixture, so, not only can be conducive to whole coal, crude oil and combustion gas resource in the zone that coal seam and oil reservoir and/or gas-bearing formation coexist gathered more up hill and dale, and, can utilize more fully waste oil well and/or waste gas well, reduce production costs widely.
Further improve as present embodiment, as shown in Figure 1, will isolate CO
2after gas, the part of the effective combustion gas in gained coal seam is for generating; To isolate CO
2after gas, another part of the effective combustion gas in gained coal seam is for the synthesis of natural gas and/or oil product; By the CO carried secretly in crude oil
2gas is separated and is obtained oil product; By the CO sneaked in the gas-bearing formation air mixture
2gas is separated and is obtained the effective combustion gas of gas-bearing formation.
Present embodiment will be isolated CO owing to having adopted
2after gas, the part of the effective combustion gas in gained coal seam is for the technological means of generating, so, can introduce external electric energy driving arrangement, realization is gathered materials on the spot, driving arrangement on the spot generates electricity, self-sufficient, circulation is produced, and has removed the laying of very long transmission line of electricity from, greatly saved circuit cost, for the well-digging construction provides larger convenience.To isolate CO owing to having adopted again
2after gas, another part of the effective combustion gas in gained coal seam is for the synthesis of natural gas and/or oil product; By the CO carried secretly in crude oil
2gas is separated and is obtained oil product; By the CO sneaked in the gas-bearing formation air mixture
2gas is separated the technological means that obtains the effective combustion gas of gas-bearing formation, so, not only can on the spot Raw material processing be become to primary product, and further optimize advantage is provided below can be.
As present embodiment, further improve again, as shown in Figure 1, the water vapour H produced from the process of generating
2o is for gathering coal seam Zhong coal seam air mixture; The water vapour H produced from the process of synthetic natural gas and/or oil product
2o is for gathering coal seam Zhong coal seam air mixture; The CO separated from crude oil
2gas is for gathering coal seam Zhong coal seam air mixture; The CO separated from the gas-bearing formation air mixture
2gas is for gathering coal seam Zhong coal seam air mixture; The tail gas produced from the process of synthetic natural gas and/or oil product (wherein comprises available gas H
2, CO, CH
4) for generating.
Present embodiment is owing to having adopted the water vapour H produced from the process of generating
2o is for gathering coal seam Zhong coal seam air mixture, the water vapour H produced from the process of synthetic natural gas and/or oil product
2o is for gathering coal seam Zhong coal seam air mixture, the CO separated from crude oil
2gas is for gathering coal seam Zhong coal seam air mixture, the CO separated from the gas-bearing formation air mixture
2gas is for gathering coal seam Zhong coal seam air mixture, and the tail gas produced from the process of synthetic natural gas and/or oil product (wherein comprises available gas H
2, CO, CH
4) for the generating technological means, so, realized water vapour H
2o and CO
2recycling of gas, turn waste into wealth, and is conducive to the unlimited generation of gasifying agent.
As shown in Figure 1 to Figure 3, a kind of fossil energy low-carbon (LC) system of mining method altogether that realizes provided by the invention, this system is positioned at the zone that coal seam 20 and oil reservoir 7 and/or 8 gas-bearing formations coexist, and (as can be seen from Figure 3, this zone is followed successively by from top to bottom: topsoil 11, mantlerock 12,20,Zhong rock stratum, coal seam 13, gas-bearing formation 8, lower rock stratum 14 and oil reservoir 7.Certainly, this zone can be also the structure of other distribution, as coal seam 20, gas-bearing formation 8, oil reservoir 7 are positioned at the structure of the mutual adjacent distributions of same level substantially), comprise underground gasification unit 2; Described underground gasification unit 2 is provided with gasifying agent import 22 and coal seam air mixture outlet 23; The gasifying agent import of described underground gasification unit 2 is communicated with the gasifying agent outlet that gasifying agent is produced unit 1; The coal seam air mixture outlet of described underground gasification unit is communicated with the coal seam air mixture import of purification separation unit 3; Described purification separation unit 3 is provided with the effective gas outlet in coal seam and CO
2gas vent; The CO of described purification separation unit 3
2gas vent is communicated with oil reservoir 7 upstreams and/or gas-bearing formation 8 upstreams by presser unit 6.
As can be seen from Figure 1, the CO of described purification separation unit 3
2the CO of gas vent and a presser unit 6
2gas feed is communicated with, the CO of this presser unit 6
2gas vent is communicated with oil reservoir 7 upstreams and/or gas-bearing formation 8 upstreams respectively.Certainly, can be also the CO of described purification separation unit 3
2gas vent respectively with the CO of two presser unit 6
2gas feed is communicated with, wherein, and the CO of a presser unit 6
2gas vent is communicated with oil reservoir 7 upstreams, the CO of another presser unit 6
2gas vent is communicated with gas-bearing formation 8 upstreams.
As can be seen from Figure 2, the provided upstream of described oil reservoir 7 is equipped with oil well air inlet port 71, the CO of this oil well air inlet port 71 and presser unit 6
2gas vent is communicated with.The provided upstream of described gas-bearing formation 8 is equipped with gas well air inlet port 81, the CO of this gas well air inlet port 81 and presser unit 6
2gas vent is communicated with.
Present embodiment is due to the CO that has adopted the purification separation unit
2the technological means that gas vent is communicated with oil reservoir upstream and/or gas-bearing formation upstream by presser unit, so the crude oil in oil reservoir can bulged-in CO
2gas is discharged, and the gas-bearing formation air mixture in gas-bearing formation can bulged-in CO
2gas is discharged.Be pressed into the CO in oil reservoir
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2gas is discharged oil reservoir (this part CO together with crude oil
2gas will further be recycled in improvement below).Be pressed into the CO in gas-bearing formation
2gas have 50% ~ 60% for good and all be sealed in underground, 40% ~ 50% CO in addition
2discharge gas-bearing formation (this part CO in gas and gas-bearing formation after combustion gas mixing
2gas will further be recycled in improvement below).As can be seen here, not only can gather materials on the spot and take full advantage of CO by the system of adopting altogether
2gas is discharged crude oil or combustion gas, needn't adopt outward transport CO
2the method of gas can exploit out by crude oil (comprising viscous crude) and combustion gas, has greatly reduced cost of production, is conducive to gather more up hill and dale the crude oil of discharge and the combustion gas of discharge, and, give again CO
2gas finds a permanent place of taking shelter, can be by CO
2gas is discharged in atmosphere, avoids contaminated environment, has realized the beneficial effect of low-carbon (LC) exploitation fossil energy.Again due to the technological means that has adopted the underground gasification unit, so, cost of production saved widely.Also owing to having adopted the underground gasification unit to be provided with gasifying agent import and coal seam air mixture outlet, the coal seam air mixture outlet of underground gasification unit is communicated with the coal seam air mixture import of purification separation unit, and the purification separation unit is provided with the effective gas outlet in coal seam and CO
2the technological means of gas vent, so, for following improvement provides advantage.
As a kind of improvement of present embodiment, as shown in Figures 2 and 3, described underground gasification unit 2 comprises the gasification tunnel 21 be arranged in coal seam 20; One end of described gasification tunnel 21 is provided with described gasifying agent import 22; The other end of described gasification tunnel 21 is provided with described coal seam air mixture outlet 23; The air mixture outlet 23 of described coal seam is formed by waste oil well and/or the transformation of waste gas well; Described being formed by the transformation of waste oil well is that the bottom near this waste oil well is provided with stop grouting plug 26 in the oil pipe of described waste oil well; Use slip casting 27 fillings in oil pipe; The height of slip casting 27 is 1/3 to 2/3 of separation layer between coal seam 20 and oil reservoir 7 (referring to Fig. 3, in rock stratum 13, gas-bearing formation 8 and lower rock stratum 14) thickness; To the oil pipe tube wall that is positioned at 20 sections, coal seam, adopt directional blasting or perforating methods to implement to destroy, oil pipe is communicated with described gasification tunnel 21; The connectivity part of oil pipe and described gasification tunnel 21 forms combustion gas condensate warehouse to the cavity between described slip casting 27 end faces; Described being formed by the transformation of waste gas well is that the bottom near this waste gas well is provided with stop grouting plug 26 in the tracheae of described waste gas well; Use slip casting 27 fillings in tracheae; The height of slip casting 27 is 1/3 to 2/3 of separation layer between coal seam 20 and gas-bearing formation 8 (referring to Fig. 3, in rock stratum 13) thickness; To the tracheae tube wall that is positioned at 20 sections, coal seam, adopt directional blasting or perforating methods to implement to destroy, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms combustion gas condensate warehouse to the cavity between described slip casting 27 end faces.
Present embodiment is owing to having adopted the underground gasification unit to comprise the gasification tunnel be arranged in coal seam, one end of gasification tunnel is provided with described gasifying agent import, the other end of gasification tunnel is provided with the air mixture outlet of described coal seam, the technological means that coal seam air mixture outlet is formed by waste oil well and/or the transformation of waste gas well, so, can greatly reduce the construction cost of underground gasification unit.Again owing to having adopted the bottom near this waste oil well in the oil pipe of waste oil well to be provided with stop grouting plug; To grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; To the oil pipe tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms the technological means of combustion gas condensate warehouse to described slip casting end face, so construction is more prone to.Similarly, adopted the bottom near this waste gas well in the tracheae of waste gas well to be provided with stop grouting plug; To grouting filling in tracheae; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; To the tracheae tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms the technological means of combustion gas condensate warehouse to described slip casting end face, construction also is more prone to.
As present embodiment, further improve, as shown in Figures 2 and 3, described gasification tunnel 21 has a plurality of; A plurality of described gasification tunnels 21 are shape being horizontally disposed with linearly; One end of a plurality of described gasification tunnels 21 is interconnected and shares a gasifying agent import 22, described gasifying agent import 22 is vertically-oriented wells, be provided with the continuous flexible pipe 24 that can insert and extract from this gasification tunnel to any gasification tunnel in described vertically-oriented well, the lateral wall of described continuous flexible pipe 24 is connected with the top seal of described vertically-oriented well, and the top of described vertically-oriented well has steam H
2o and CO
2the import 25 of gas, the other end of a plurality of described gasification tunnels 21 is communicated to respectively described waste oil well or waste gas well.Certainly, can be also that the other end of a plurality of described gasification tunnels 21 is interconnected and shares a waste oil well or waste gas well; One end of a plurality of described gasification tunnels is respectively arranged with gasifying agent import 22, described gasifying agent import 22 is vertically-oriented wells, be provided with the continuous flexible pipe 24 that can insert and extract from this gasification tunnel to gasification tunnel in each described vertically-oriented well, the lateral wall of each described continuous flexible pipe 24 is connected with the top seal of the vertically-oriented well in place, and the top of each described vertically-oriented well all has steam H
2o and CO
2the import 25 of gas.
Present embodiment is a plurality of owing to having adopted gasification tunnel to have; A plurality of gasification tunnels are shape being horizontally disposed with linearly; One end of a plurality of gasification tunnels is interconnected and shares a gasifying agent import, the gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to any gasification tunnel in vertically-oriented well, the lateral wall of continuous flexible pipe is connected with the top seal of vertically-oriented well, and the top of vertically-oriented well has steam H
2o and CO
2the import of gas, the other end of a plurality of gasification tunnels is communicated to respectively the technological means of waste oil well or waste gas well, so, can pass through waste oil well or the waste gas well construction horizontal orientation well of a vertically-oriented well to different orientation, greatly saved construction cost.When the other end that has adopted a plurality of gasification tunnels is interconnected and shares a waste oil well or waste gas well, one end of a plurality of gasification tunnels is respectively arranged with the gasifying agent import, the gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to gasification tunnel in each vertically-oriented well, the lateral wall of each continuous flexible pipe is connected with the top seal of the vertically-oriented well in place, and the top of each vertically-oriented well all has steam H
2o and CO
2the technological means of the import of gas, not only can save real work cost widely, and, the coal seam air mixture in each gasification tunnel can be concentrated and discharged, be conducive to enhance productivity.
As present embodiment, further improve, as shown in Figure 1 to Figure 3, described system also comprises generator unit 5 and chemical industry synthesis unit 4; Described generator unit 5 is provided with the effective fuel gas inlet in coal seam; Described chemical industry synthesis unit 4 is provided with the effective fuel gas inlet in coal seam; The effective gas outlet in coal seam of described purification separation unit 3 is communicated with the effective fuel gas inlet in coal seam of the effective fuel gas inlet in the coal seam of generator unit 5 and chemical industry synthesis unit 4 respectively; Described generator unit 5 is provided with steam H
2o outlet and tail gas import; Described chemical industry synthesis unit 4 is provided with steam H
2o outlet and tail gas outlet; Described oil reservoir 7 downstreams are communicated with the crude oil import of Oil-gas Separation unit 9; Described Oil-gas Separation unit 9 is provided with CO
2gas vent; Described gas-bearing formation 8 downstreams are communicated with the gas-bearing formation air mixture import of gas gas separative element 10; Described gas gas separative element 10 is provided with CO
2gas vent.
As can be seen from Figure 2, described oil reservoir 7 downstreams are provided with oil well oil-out 72, and described oil well oil-out 72 is communicated with the crude oil import of Oil-gas Separation unit 9; Described gas-bearing formation 8 downstreams are provided with gas well gas outlet 82, and described gas well gas outlet 82 is communicated with the gas-bearing formation air mixture import of gas gas separative element 10.
The technological means that present embodiment is communicated with the effective fuel gas inlet in coal seam of the effective fuel gas inlet in the coal seam of generator unit and chemical industry synthesis unit respectively due to the effective gas outlet in coal seam that has adopted the purification separation unit, so, can introduce external electric energy driving arrangement, realization is gathered materials on the spot, driving arrangement on the spot generates electricity, self-sufficient, circulation is produced, and has removed the laying of very long transmission line of electricity from, greatly saved circuit cost, for the well-digging construction provides larger convenience.Again owing to having adopted generator unit to be provided with steam H
2o outlet and tail gas import; The chemical industry synthesis unit is provided with steam H
2o outlet and tail gas outlet; The oil reservoir downstream is communicated with the crude oil import of Oil-gas Separation unit; The Oil-gas Separation unit is provided with CO
2gas vent; The gas-bearing formation downstream is communicated with the gas-bearing formation air mixture import of gas gas separative element; Gas gas separative element is provided with CO
2the technological means of gas vent, so, not only can on the spot Raw material processing be become to primary product, and further optimize advantage is provided below can be.
As present embodiment, further improve again, as shown in Figure 1, the steam H of described generator unit 5
2the steam H of O outlet and described vertically-oriented aboveground section
2o and CO
2gas feed 25 is communicated with; The steam H of described chemical industry synthesis unit 4
2the steam H of O outlet and described vertically-oriented aboveground section
2o and CO
2gas feed 25 is communicated with; The CO of described Oil-gas Separation unit 9
2the steam H of gas vent and described vertically-oriented aboveground section
2o and CO
2gas feed 25 is communicated with; The CO of described gas gas separative element 10
2the steam H of gas vent and described vertically-oriented aboveground section
2o and CO
2gas feed 25 is communicated with; The tail gas outlet of described chemical industry synthesis unit 4 is communicated with the tail gas import of described generator unit 5.
Present embodiment is due to the steam H that has adopted generator unit
2the steam H of O outlet and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The steam H of chemical industry synthesis unit
2the steam H of O outlet and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The CO of Oil-gas Separation unit
2the steam H of gas vent and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The CO of gas gas separative element
2the steam H of gas vent and vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The technological means that the tail gas outlet of chemical industry synthesis unit is communicated with the tail gas import of generator unit, so, realized water vapour H
2o and CO
2recycling of gas, turn waste into wealth, and is conducive to the unlimited generation of gasifying agent.
Operating principle of the present invention and concrete technology parameter are as follows.
The present invention utilizes coal underground gasification technology gasification deepen coal resource, in the stratum that coal seam and oil reservoir are deposited mutually, utilizes waste oil well construction underground gasification unit, when gasification is mined, and the CO of generation
2be pressed into the oil reservoir displacement of reservoir oil after separation and be stored.In this system, gasifying agent is produced unit, and air separation is become to O
2and N
2, and by O
2, steam, CO
2be mixed into gasifying agent Deng in proportion and inject the underground coal gasification(UCG) unit; Light with high-temperature oxygen in Li Jiang coal seam, underground gasification unit, make that coal seam and gasifying agent burn, gasification, pyrolytic reaction generate mixed gas, and import the purification separation unit; Gas purification and separative element are separated into available gas (H after mixed gas is purified
2, CO, CH
4) and CO
2, available gas is imported to chemical industry synthesis unit and generator unit, CO
2deliver to presser unit; Chemical industry synthesis unit and generator unit, synthesize available gas the chemical products such as natural gas, oil product; Presser unit is by CO
2the oil well air inlet port is sent in compression, and 50%～60% CO is approximately arranged
2be stored in undergroundly by permanent envelope, at oily oil inlet and outlet, gather oil gas, carry out Oil-gas Separation, obtain oil product and CO
2gas, CO
2the steam that gas and chemical industry synthesis unit and generator unit produce enters the underground gasification unit as the gasifying agent re-injection of underground gasification unit, makes remaining CO
2further utilized, the electric energy that generator unit produces is for the power consumption of each unit.Thereby realized the exploitation of fossil energy low-carbon cycle.
In coal and oil, particularly viscous crude association zone, utilize abandoned well to set up coal, oily gentle low-carbon (LC) extraction system altogether, comprising: gasifying agent is produced unit, and air separation is become to O
2and N
2, by O
2mix by a certain percentage rear injection underground gasification unit with the afterheat steam of chemical industry and generator unit.
The underground coal gasification(UCG) unit, utilize the waste oil well to go out gas well as underground gasification, the construction directional well is built the subterranean coal gasification unit, arrange the continuous flexible pipe by directional well, send into gasifying agent to the gasification coal seam, segmented gasification coal seam in directional well, generate mixed gas, derived by the waste oil well, and mixed gas is imported to the purification separation unit.
(1) select the go out gas well of suitable waste oil well as underground gasification, place stop grouting plug in the waste oil bottom, by waste oil bottom grouting filling, be highly 1/3～2/3 of coal seam and zonal isolation layer thickness, leave coal gas condensate warehouse, sleeve pipe employing directional blasting or perforating technology in the coal seam section, destroy the waste oil tube borehole wall, and with the coal seam conducting, form gas well.
(2) near the directional well of constructing in the coal seam at (distance be greater than 200m) or one group of waste oil well middle part an abandoned well, utilize the directional horizontal wells technology, in coal seam to each waste oil well construction directional horizontal wells, horizontal well is at bottom, keep at a distance the bottom contour interval from being 1/5～1/10 of coal seam thickness, and link up with the waste oil well borehole wall destroyed, thereby conducting goes out gas well, forms one or more gasification faces.
(3) arrange the continuous flexible pipe at directional well, distance between the port of export of continuous flexible pipe bottom and described gasification tunnel is 20-80m, the oxygen of implantation temperature Approaching Coal Seam burning-point in the continuous flexible pipe, the coal seam forced oxidation is lighted, normal temperature oxygen, injected water steam and CO in the annular space of continuous flexible pipe and directional hole are injected by the continuous flexible pipe after lighting in coal seam
2mist, make coal combustion, gasification, pyrolysis and produce to contain H
2, CO, CH
4, CO
2mixed gas, by going out gas well, derive.Gas injection pressure is less than local coal seam hydrostatic pressure.
(4) first gasification chamber is after reaching the coal amount of designed combustion, the continuous flexible pipe is retreated to 20-80m, the oxygen that refills temperature Approaching Coal Seam burning-point is lighted the coal seam forced oxidation, normal temperature oxygen, injected water steam and CO in the annular space of continuous flexible pipe and directional hole are injected by the continuous flexible pipe after lighting in coal seam
2mist, make coal combustion, gasification, pyrolysis and produce to contain H
2, CO, CH
4, CO
2mixed gas, by going out gas well, derive, form second gasification chamber, by that analogy, last gas injection position is at the level point of directional well.After finishing, a gasification face starts another gasification face with same method.
The gas purification separative element, be separated into available gas (H after purifying for the mixed gas that the waste oil well is derived
2, CO, CH
4) and CO
2.Available gas is imported to chemical industry synthesis unit and generator unit, CO
2deliver to presser unit.
Chemical industry synthesis unit and generator unit, synthesize available gas the chemical products such as oil, natural gas; The synthetic tail gas of chemical industry (wherein comprises available gas H
2, CO, CH
4) for generating, because effective gas component height can improve synthetic and generating efficiency, the electric energy produced is for the power consumption of each unit.
Presser unit, the vertical interval of coal seam and oil reservoir is greater than 50 meters, the CO that separation is obtained
2the oil well displacement of reservoir oil is injected in compression, and pressure is greater than 9MPa, and 50%～60% CO is approximately arranged
2be stored in undergroundly by permanent envelope, at producing well, collect oil product and effusion CO
2, and separated.
Separate the CO obtained in oil product
2the afterheat steam obtained with chemical industry, generating returns to the underground gasification unit as gasifying agent, makes remaining 40～50% CO
2recycled.
CO
2?+?C?＝?2CO
H
2O+C＝?H
2+CO
Underground gasification unit and presser unit advance and take over layout, can realize the low-carbon cycle exploitation of coal seam and oil reservoir.
Said system and method can also be for the low-carbon cycle exploitations of the associated resources such as coal and shale gas-bearing formation, oil shale layer, coal seam gas-bearing formation.
In coal and oil, particularly viscous crude association zone, 1500 meters of reservoir depth, 1200 meters of the coal seam degree of depth, 20 meters of coal seam thicknesses, 280 meters of coal seam and oil reservoir spacings.Utilize the abandoned well of oil extraction, the construction directional well is built the subterranean coal gasification furnace, the waste oil well goes out gas well as underground gasification furnace, near the directional well of constructing abandoned well, arrange the continuous flexible pipe by directional well, to the gasification coal seam, sends into gasifying agent, segmented gasification coal seam in directional well, generate mixed gas, derived by the waste oil well, and mixed gas is imported to the purification separation unit.Concrete steps are as follows:
(1) select the go out gas well of two waste oil wells (distance is greater than 400m) as underground gasification, place stop grouting plug in the waste oil bottom, by waste oil bottom grouting filling, packed height is 200 meters, stay the space of the height of 80 meters at the bottom of hole, as coal gas condensate warehouse.Adopt directional blasting or perforating technology at the sleeve pipe of coal seam section, destroy the waste oil tube borehole wall, and with the coal seam conducting, form gas well.
(2) directional well of constructing in the coal seam at two abandoned wells middle part, it is target that first-selected selection goes out gas well flatly, utilize the directional horizontal wells technology, in coal seam to the well construction directional horizontal wells of giving vent to anger, horizontal well is at bottom, the horizontal well track is kept at a distance the bottom contour interval from being 2 meters, and with the borehole wall conducting destroyed, thereby link up out gas well.
(3) arrange the continuous flexible pipe at directional well, end is apart from venthole 50m, the oxygen of implantation temperature Approaching Coal Seam burning-point in the continuous flexible pipe, the coal seam forced oxidation is lighted, after light in coal seam, inject normal temperature oxygen, injected water steam and CO in the annular space of continuous flexible pipe and directional hole by the continuous flexible pipe
2mist, make coal combustion, gasification, pyrolysis and produce to contain H
2, CO, CH
4, CO
2mixed gas, by going out gas well, derive.Gas injection pressure is less than local coal seam hydrostatic pressure.
(4) first gasification chamber is after reaching the coal amount of designed combustion, the continuous flexible pipe is retreated to 50m, the oxygen that refills temperature Approaching Coal Seam burning-point is lighted the coal seam forced oxidation, normal temperature oxygen, injected water steam and CO in the annular space of continuous flexible pipe and directional hole are injected by the continuous flexible pipe after lighting in coal seam
2mist, make coal combustion, gasification, pyrolysis and produce to contain H
2, CO, CH
4, CO
2mixed gas, by going out gas well, derive, form second gasification chamber, by that analogy, last gas injection position is at the level point of directional well.After a gasification face finishes, the continuous flexible pipe is proposed.
(5) utilize the vertical section of directional hole, with same method, to the directed lateral aperture of another well construction of giving vent to anger, transfer the continuous flexible pipe, another work plane gasifies.
(6) be illustrated in figure 3 and guarantee the production capacity demand, can have a plurality of directional wells to gasify simultaneously.
The underground gasification raw gas is derived by the gas well that goes out of waste oil well transformation, in the ground purification separation, derives respectively available gas (H
2, CO, CH
4) and CO
2.Available gas imports chemical industry synthesis unit, CO
2import presser unit.
Available gas is synthetic for chemical industry, produces methane or oil product, and the synthetic tail gas of chemical industry (wherein comprises available gas H
2, CO, CH
4) for generating, the electric energy produced is for the power consumption of each unit.Because available gas component height can improve synthetic and generating efficiency.
The CO that separation is obtained
2the oil well displacement of reservoir oil is injected in compression, and pressure is greater than 9MPa, and 50%～60% CO is approximately arranged
2be stored in undergroundly by permanent envelope, at producing well, collect oil product and effusion CO
2, and separated.
Separate the CO obtained in oil product
2the afterheat steam obtained with chemical industry, generating returns to the underground gasification unit as gasifying agent, makes remaining 40～50 CO
2gas is recycled.
The directional well of constructing in the coal seam at one group of waste oil well middle part, can form a plurality of gasification faces.Underground gasification unit and presser unit advance and take over layout, can realize the low-carbon cycle exploitation of coal seam and oil reservoir.
System and method of the present invention is not limited to the embodiment described in the specific embodiment, and those skilled in the art's technical scheme according to the present invention draws other embodiment, belongs to equally the technology of the present invention innovation scope.
Claims (10)
1. the method that the fossil energy low-carbon (LC) is adopted altogether is characterized in that: the zone coexisted at coal seam and oil reservoir and/or gas-bearing formation gathers coal seam Zhong coal seam air mixture, by the CO in the air mixture of coal seam
2gas is separated, by the CO separated
2gas is pressed in oil reservoir and/or gas-bearing formation, the bulged-in CO of the crude oil in oil reservoir
2gas is discharged, the bulged-in CO of gas-bearing formation air mixture in gas-bearing formation
2gas is discharged, and gathers respectively the crude oil of discharge and the gas-bearing formation air mixture of discharge.
2. the method that fossil energy low-carbon (LC) according to claim 1 is adopted altogether is characterized in that: the Zhong coal seam air mixture of described collection coal seam is in underground generation coal seam air mixture by the underground gasification method; Described underground gasification method is the oxygen to gasification tunnel implantation temperature Approaching Coal Seam burning-point in coal seam, the coal seam forced oxidation is lighted, coal seam is lighted rear continuation and is injected normal temperature oxygen to gasification tunnel in coal seam, simultaneously to injected gas agent in coal seam, gas injection pressure is less than local coal seam hydrostatic pressure, makes coal seam sustained combustion, gasification, pyrolysis and produce to contain H
2, CO, CH
4, CO
2the coal seam air mixture; The air mixture of described coal seam goes out by waste oil well and/or the waste gas well array be communicated with coal seam.
3. the method that fossil energy low-carbon (LC) according to claim 2 is adopted altogether, it is characterized in that: from the close-by examples to those far off push ahead step by step in the zone at the crude oil place that described collection is discharged, from the close-by examples to those far off push ahead step by step in the zone of the gas-bearing formation air mixture that described collection is discharged, push ahead simultaneously in the zone of the gas-bearing formation air mixture that the zone at the crude oil place that perhaps, described collection is discharged and described collection are discharged; Correspondingly, the zone of described collection coal seam Zhong coal seam air mixture follows the back in the zone of the zone at the crude oil place of discharging in described collection and/or the gas-bearing formation air mixture that described collection is discharged synchronously to push ahead.
4. the method that fossil energy low-carbon (LC) according to claim 1 is adopted altogether is characterized in that: will isolate CO
2after gas, the part of the effective combustion gas in gained coal seam is for generating; To isolate CO
2after gas, another part of the effective combustion gas in gained coal seam is for the synthesis of natural gas and/or oil product; By the CO carried secretly in crude oil
2gas is separated and is obtained oil product; By the CO sneaked in the gas-bearing formation air mixture
2gas is separated and is obtained the effective combustion gas of gas-bearing formation.
5. the method that fossil energy low-carbon (LC) according to claim 4 is adopted altogether is characterized in that: the water vapour H produced from the process of generating
2o is for gathering coal seam Zhong coal seam air mixture; The water vapour H produced from the process of synthetic natural gas and/or oil product
2o is for gathering coal seam Zhong coal seam air mixture; The CO separated from crude oil
2gas is for gathering coal seam Zhong coal seam air mixture; The CO separated from the gas-bearing formation air mixture
2gas is for gathering coal seam Zhong coal seam air mixture; The tail gas produced from the process of synthetic natural gas and/or oil product is for generating.
6. one kind for realizing the system of mining method altogether of fossil energy low-carbon (LC) as claimed in claim 1, and it is characterized in that: this system is positioned at the zone that coal seam and oil reservoir and/or gas-bearing formation coexist, and comprises gasification unit; Described gasification unit is provided with gasifying agent import and coal seam air mixture outlet; The coal seam air mixture outlet of described gasification unit is communicated with the coal seam air mixture import of purification separation unit; Described purification separation unit is provided with the effective gas outlet in coal seam and CO
2gas vent; The CO of described purification separation unit
2gas vent is communicated with oil reservoir upstream and/or gas-bearing formation upstream by presser unit.
7. the system that fossil energy low-carbon (LC) according to claim 6 is adopted altogether is characterized in that: described gasification unit is the underground gasification unit; Described underground gasification unit comprises the gasification tunnel be arranged in coal seam; One end of described gasification tunnel is provided with described gasifying agent import; The other end of described gasification tunnel is provided with the air mixture outlet of described coal seam; The air mixture outlet of described coal seam is formed by waste oil well and/or the transformation of waste gas well; Described being formed by the transformation of waste oil well is that the bottom near this waste oil well is provided with stop grouting plug in the oil pipe of described waste oil well; To grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; To the oil pipe tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms combustion gas condensate warehouse to the cavity between described slip casting end face; Described being formed by the transformation of waste gas well is that the bottom near this waste gas well is provided with stop grouting plug in the tracheae of described waste gas well; To grouting filling in tracheae; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; To the tracheae tube wall that is positioned at the coal seam section, adopt directional blasting or perforating methods to implement to destroy, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms combustion gas condensate warehouse to the cavity between described slip casting end face.
8. the system that fossil energy low-carbon (LC) according to claim 7 is adopted altogether is characterized in that: described gasification tunnel has a plurality of; A plurality of described gasification tunnels are shape being horizontally disposed with linearly; One end of a plurality of described gasification tunnels is interconnected and shares a gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to any gasification tunnel in described vertically-oriented well, the lateral wall on described continuous flexible pipe top is connected with the top seal of described vertically-oriented well, and the top of described vertically-oriented well has steam H
2o and CO
2the import of gas, the initial distance between the outlet of described continuous flexible pipe bottom and the other end of described gasification tunnel is 20-80m; The other end of a plurality of described gasification tunnels is communicated to respectively described waste oil well or waste gas well; Perhaps, the other end of a plurality of described gasification tunnels is interconnected and shares a waste oil well or waste gas well; One end of a plurality of described gasification tunnels is respectively arranged with the gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with the continuous flexible pipe that can insert and extract from this gasification tunnel to gasification tunnel in each described vertically-oriented well, the lateral wall on each described continuous flexible pipe top is connected with the top seal of the vertically-oriented well in place, and the top of each described vertically-oriented well all has steam H
2o and CO
2the import of gas, the initial distance between the outlet of each described continuous flexible pipe bottom and the corresponding described gasification tunnel other end is 20-80m.
9. the system that fossil energy low-carbon (LC) according to claim 8 is adopted altogether is characterized in that: described system also comprises generator unit and chemical industry synthesis unit; Described generator unit is provided with the effective fuel gas inlet in coal seam; Described chemical industry synthesis unit is provided with the effective fuel gas inlet in coal seam; The effective gas outlet in coal seam of described purification separation unit is communicated with the effective fuel gas inlet in coal seam of the effective fuel gas inlet in the coal seam of generator unit and chemical industry synthesis unit respectively; Described oil reservoir downstream is communicated with the crude oil import of Oil-gas Separation unit; Described gas-bearing formation downstream is communicated with the gas-bearing formation air mixture import of gas gas separative element.
10. the system that fossil energy low-carbon (LC) according to claim 9 is adopted altogether is characterized in that: described chemical industry synthesis unit is provided with steam H
2o outlet and tail gas outlet; Described generator unit is provided with steam H
2o outlet and tail gas import; The steam H of described chemical industry synthesis unit
2the steam H of O outlet and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The steam H of described generator unit
2the steam H of O outlet and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; The tail gas outlet of described chemical industry synthesis unit is communicated with the tail gas import of described generator unit; Described Oil-gas Separation unit is provided with CO
2gas vent; The CO of described Oil-gas Separation unit
2the steam H of gas vent and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with; Described gas gas separative element is provided with CO
2gas vent; The CO of described gas gas separative element
2the steam H of gas vent and described vertically-oriented aboveground section
2o and CO
2gas feed is communicated with.
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| CN103470223B (en) | 2015-11-25 |
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