CN103470223B

CN103470223B - The method and system that a kind of fossil energy low-carbon (LC) is adopted altogether

Info

Publication number: CN103470223B
Application number: CN201310433758.XA
Authority: CN
Inventors: 梁杰; 赵丽梅; 梁栋宇; 王张聊; 樊陈子; 刘淑琴; 崔勇; 梁鲲
Original assignee: China University of Mining and Technology Beijing CUMTB
Current assignee: China University of Mining and Technology Beijing CUMTB
Priority date: 2013-09-23
Filing date: 2013-09-23
Publication date: 2015-11-25
Anticipated expiration: 2033-09-23
Also published as: CN103470223A

Abstract

The invention discloses the method and system that a kind of fossil energy low-carbon (LC) is adopted altogether.Described method is: gather the coal seam air mixture in coal seam, by the CO in the air mixture of coal seam ₂gas separaion out, 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 the crude oil of discharge and the gas-bearing formation air mixture of discharge respectively.Described system comprises underground gasification unit; The coal seam air mixture outlet of underground gasification unit and the coal seam air mixture inlet communication of purification separation unit; The CO of purification separation unit ₂gas vent is communicated with oil reservoir upstream and/or gas-bearing formation upstream by presser unit.The present invention can gather materials on the spot and take full advantage of CO ₂crude oil or combustion gas are discharged by gas, can by CO ₂gas is discharged in air, avoids contaminated environment, achieves the beneficial effect of low-carbon (LC) exploitation fossil energy.

Description

The method and system that a kind of fossil energy low-carbon (LC) is adopted altogether

Technical field

The present invention relates to fossil energy production technique field, particularly relate to a kind of region that coal seam and oil reservoir and/or gas-bearing formation are coexisted and carry out the method and system that fossil energy low-carbon (LC) adopts altogether.

Background technology

Fossil energy mainly contains coal, crude oil and combustion gas, along with superficial part (1000 meters with shallow) coal resources and middle and high infiltration permeability oil reservoir resource consume gradually, the exploitation of deep (1000 meters with dark) coal resources, viscous crude resource and combustion gas resource is more and more subject to the attention of countries in the world.And in deep, many regional coal seams, oil reservoir and gas-bearing formation exist simultaneously, and coal seam is on top, and oil reservoir and gas-bearing formation are in bottom.

Predict the outcome according to Third National coal resources: national vertical depth 2000m with shallow prognostic resources be 4.55Tt, vertical depth 1000m with shallow for 1.84Tt, what namely 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, well work is difficult to exploitation, and therefore the current exploitation to deepen coal resource does not still possess ripe production technique, but the object utilizing coal underground gasification technology can realize traditional coal winning technology cannot to realize.Underground coal gasification(UCG) (UndergroundCoalGasification, UCG) is exactly controlledly burnt by the coal being in underground, by producing the technology of new generation of fuel gas to the heat effect of coal and chemical action.Underground coal gasification(UCG) coal gas main component has: H ₂, CO, CH ₄, CO ₂, wherein H 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 air and contaminated environment.

In world's crude resources reserves, heavy oil reserves occupies very large proportion, but exploitation effect is generally bad, and recovery ratio is lower.How can better heavy crude producing, improving the recovery ratio of viscous crude, is the important topic of research at present.China's Low permeable oil and gas reservoirs about 63.2 hundred million tons, still have about 50% not employ, the hyposmosis resource employed, due to the restriction of technical level, average recovery ratio is only 23.3%.Viscous crude flow resistance is large, usually takes heating exploitation method for the viscous crude in oil reservoir.From nineteen fifty, many countries at laboratory and scene all to CO ₂improve recovery ratio method and carry out the research of considerable scale.The seventies U.S. and the country such as the 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 achieves 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 area that source of the gas enriches is widely used 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, 50% ~ 60% is about had to be stored in underground by permanent envelope.Therefore, viscous crude resource exploitation needs a large amount of CO ₂.The method of outward transport is all adopted to solve at present.

At 1000 meters with deeply, many regional coal seams and oil reservoir often exist simultaneously, as 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 1800 meters ~ 2500 meters oil-bearing layer at 1200 meters ~ 1600 meters.Some region also gas-bearing bed, coal seam is all on oil reservoir and 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 carried out separately all separately.Isolated CO in the process gathering coal, crude oil or combustion gas ₂gas is deposited nowhere and directly can only be discharged into air and contaminated environment.Oil reservoir and gas-bearing formation are through exploitation for many years, and many oil wells and gas well are scrapped because taking out not fuel-displaced, but also there is a certain amount of Residual oil and residual gas in oil reservoir and gas-bearing formation.Although can CO be utilized ₂again drive and adopt, OW can be made to be re-used, the service life of Yanchang Oilfield, but, extracting directly CO from air ₂gas efficiency is too low, adopts outward transport CO ₂the method of gas considerably increases cost of transportation again, considers to lose more than gain from overall.

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 the method can not be a large amount of CO ₂gas discharging is contaminated environment to air, need not adopt outward transport CO ₂crude oil and combustion gas can be exploited out by the method for gas, significantly reduce 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 the CO that this system can not be a large amount of ₂gas discharging is contaminated environment to air, need not by outward transport CO ₂crude oil and combustion gas can be exploited out by gas, significantly reduce 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, in the region that coal seam and oil reservoir and/or gas-bearing formation coexist, gathers the coal seam air mixture in coal seam, by the CO in the air mixture of coal seam ₂gas separaion out, 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 the crude oil of discharge and the gas-bearing formation air mixture of discharge respectively.

Coal seam air mixture in described collection coal seam is in underground generation coal seam air mixture by underground gasification method; Described underground gasification method is the oxygen of gasification tunnel implantation temperature Approaching Coal Seam burning-point in coal seam, 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 producing containing H ₂, CO, CH ₄, CO ₂coal seam air mixture; The air mixture of described coal seam is gone out by the waste oil well that is communicated with coal seam and/or waste gas well array.

The described region gathering the crude oil place of discharging from the close-by examples to those far off is pushed ahead step by step, the described region gathering the gas-bearing formation air mixture of discharging from the close-by examples to those far off is pushed ahead step by step, or the described region gathering the region at the crude oil place of discharging and the gas-bearing formation air mixture of described collection discharge is pushed ahead simultaneously; Correspondingly, the region of the coal seam air mixture in described collection coal seam is followed and is gathered synchronously pushing ahead of the region of the region at the crude oil place of discharging and/or the gas-bearing formation air mixture of described collection discharge below described.

CO will be isolated ₂a part for the effective combustion gas in gained coal seam after gas is used for generating; CO will be isolated 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 separaion out obtains oil product; By the CO be mixed in gas-bearing formation air mixture ₂gas separaion out obtains the effective combustion gas of gas-bearing formation.

The water vapour H produced from the process of generating ₂o is for gathering the coal seam air mixture in coal seam; The water vapour H produced from the process of synthetic natural gas and/or oil product ₂o is for gathering the coal seam air mixture in coal seam; The CO separated from crude oil ₂gas is for gathering the coal seam air mixture in coal seam; The CO separated from gas-bearing formation air mixture ₂gas is for gathering the coal seam air mixture in coal seam; 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 have employed the CO that will separate 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.CO in press-in oil reservoir ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas discharges oil reservoir (this part CO together with crude oil ₂gas is further recycled in improvement below).CO in press-in gas-bearing formation ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas-bearing formation (this part CO is discharged after combustion gas mixing in gas and gas-bearing formation ₂gas is recycled further by improvement below).As can be seen here, the method by adopting altogether not only can be gathered materials on the spot and be taken full advantage of CO ₂crude oil or combustion gas are discharged by gas, need not adopt outward transport CO ₂crude oil (comprising viscous crude) and combustion gas can be exploited out by the method for gas, significantly reduce cost of production, are conducive to gathering the crude oil of discharge and the combustion gas of discharge more up hill and dale, and, give CO again ₂gas finds a permanent place of taking shelter, can by CO ₂gas is discharged in air, avoids contaminated environment, achieves the beneficial effect of low-carbon (LC) exploitation fossil energy.

2, the technical program is the technological means of coal seam air mixture being discharged in underground generation coal seam air mixture and by waste oil well and/or waste gas well by underground gasification method owing to have employed the coal seam air mixture gathered in coal seam, so, can reduce costs further.Again owing to have employed the oxygen of gasification tunnel implantation temperature Approaching Coal Seam burning-point in coal seam, 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 producing containing H ₂, CO, CH ₄, CO ₂the technological means of coal seam air mixture, so, can pole in-situ generation coal seam air mixture simply, further reduce costs.

3, the technical program is from the close-by examples to those far off pushed ahead step by step owing to have employed the region gathering the crude oil place of discharging, the region gathering the gas-bearing formation air mixture of discharging from the close-by examples to those far off is pushed ahead step by step, and the region gathering the crude oil place of discharging and the region gathering the gas-bearing formation air mixture of discharging are pushed ahead simultaneously; Correspondingly, the technological means of synchronously pushing ahead in the region of the gas-bearing formation air mixture of discharging in the region and/or described collection that gather the crude oil place of discharging is followed in the region gathering the coal seam air mixture in coal seam below, so, whole coal in the region that coal seam and oil reservoir and/or gas-bearing formation coexist, crude oil and combustion gas not only can be conducive to gather more up hill and dale, and, waste oil well and/or waste gas well can be utilized more fully, reduce cost of production widely.

4, the technical program will isolate CO owing to have employed ₂the technological means of a part for generating electricity of the effective combustion gas in gained coal seam after gas, so, external electrical energy drive equipment can be introduced, realization is gathered materials on the spot, generate electricity driving arrangement on the spot, self-sufficient, circulation is produced, and eliminates the laying of very long transmission line of electricity, greatly save circuit cost, for well-digging construction provides larger convenience.CO will be isolated again owing to have employed 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 separaion out obtains oil product; By the CO be mixed in gas-bearing formation air mixture ₂gas separaion out obtains the technological means of the effective combustion gas of gas-bearing formation, so, not only on the spot Raw material processing can be become primary product, and below can be, further optimization provides advantage.

5, the technical program is owing to have employed the water vapour H produced from the process of generating ₂o for gathering the coal seam air mixture in coal seam, the water vapour H produced from the process of synthetic natural gas and/or oil product ₂o is for gathering the coal seam air mixture in coal seam, the CO separated from crude oil ₂gas is for gathering the coal seam air mixture in coal seam, the CO separated from gas-bearing formation air mixture ₂gas is for gathering the coal seam air mixture in coal seam, 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) technological means for generating electricity, so, achieve water vapour H ₂o and CO ₂recycling of gas, turns waste into wealth, and is conducive to the unlimited generation of gasifying agent.

With regard to product, in order to solve another technical problem above-mentioned, the system that a kind of fossil energy low-carbon (LC) provided by the invention is adopted altogether, this system is positioned at the region 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 and the coal seam air mixture inlet communication 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 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, in the oil pipe of described waste oil well, the bottom of this waste oil well is provided with stop grouting plug; Grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the oil pipe tube wall being positioned at coal seam section, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms gas condensates warehouse to the cavity between described slip casting end face; Described being formed by the transformation of waste gas well is that tracheal strips at described waste gas well is provided with stop grouting plug near the bottom of this waste gas well; To tracheal strips grouting filling; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the tracheae tube wall being positioned at coal seam section, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms gas condensates warehouse to the cavity between described slip casting end face.

Described gasification tunnel has multiple; Multiple described gasification tunnel linearly shape being horizontally disposed with; One end of multiple described gasification tunnel is interconnected and shares a gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with in described vertically-oriented well and can insert and the continuous flexible pipe extracted from this gasification tunnel to any one gasification tunnel, 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 multiple described gasification tunnel is communicated to described waste oil well or waste gas well respectively; Or the other end of multiple described gasification tunnel is interconnected and shares a waste oil well or waste gas well; One end of multiple described gasification tunnel is respectively arranged with gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with in vertically-oriented well described in each and can insert and the continuous flexible pipe extracted from this gasification tunnel to gasification tunnel, described in each, the lateral wall on continuous flexible pipe top is connected with the top seal of the vertically-oriented well in place, and described in each, the top of vertically-oriented well all has steam H ₂o and CO ₂the import of gas, the initial distance between the outlet of continuous flexible pipe bottom described in each 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 the coal seam of chemical industry synthesis unit with the effective fuel gas inlet in the coal seam of generator unit respectively; Described oil reservoir downstream is communicated with the crude oil import of Oil-gas Separation unit; The gas-bearing formation air mixture inlet communication of described gas-bearing formation downstream and gas gas separative element.

Described chemical industry synthesis unit is provided with steam H ₂o outlet and offgas outlet; Described generator unit is provided with steam H ₂o outlet and inlet exhaust gas; The steam H of described chemical industry synthesis unit ₂the steam H in O outlet and described vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The steam H of described generator unit ₂the steam H in O outlet and described vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The offgas outlet of described chemical industry synthesis unit is communicated with the inlet exhaust gas 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 in gas vent and described vertically-oriented aboveground portion 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 in gas vent and described vertically-oriented aboveground portion 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 owing to have employed the CO of 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.CO in press-in oil reservoir ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas discharges oil reservoir (this part CO together with crude oil ₂gas is recycled further by improvement below).CO in press-in gas-bearing formation ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas-bearing formation (this part CO is discharged after combustion gas mixing in gas and gas-bearing formation ₂gas is recycled further by improvement below).As can be seen here, the system by adopting altogether not only can be gathered materials on the spot and be taken full advantage of CO ₂crude oil or combustion gas are discharged by gas, need not adopt outward transport CO ₂crude oil (comprising viscous crude) and combustion gas can be exploited out by the method for gas, significantly reduce cost of production, are conducive to gathering the crude oil of discharge and the combustion gas of discharge more up hill and dale, and, give CO again ₂gas finds a permanent place of taking shelter, can by CO ₂gas is discharged in air, avoids contaminated environment, achieves the beneficial effect of low-carbon (LC) exploitation fossil energy.Again owing to have employed the technological means of gasification unit, so, save cost of production widely.Also be provided with gasifying agent import and coal seam air mixture outlet owing to have employed gasification unit, the coal seam air mixture outlet of gasification unit and the coal seam air mixture inlet communication of purification separation unit, purification separation unit is provided with the effective gas outlet in coal seam and CO ₂the technological means of gas vent, so, for improvement below provides advantage.

2, the technical program is underground gasification unit owing to have employed gasification unit, 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 transformed by waste oil well and/or waste gas well, so, greatly can reduce the construction cost of underground gasification unit.Again because the bottom that have employed near this waste oil well in the oil pipe of waste oil well is provided with stop grouting plug; Grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the oil pipe tube wall being positioned at coal seam section, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms the technological means of gas condensates warehouse to described slip casting end face, so construction is more prone to.Similarly, have employed, at the tracheal strips of waste gas well, the bottom of this waste gas well is provided with stop grouting plug; To tracheal strips grouting filling; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the tracheae tube wall being positioned at coal seam section, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms the technological means of gas condensates warehouse to described slip casting end face, construction is also more prone to.

3, the technical program has multiple owing to have employed gasification tunnel; Multiple gasification tunnel linearly shape being horizontally disposed with; One end of multiple gasification tunnel is interconnected and shares a gasifying agent import, gasifying agent import is vertically-oriented well, be provided with in vertically-oriented well and can insert and the continuous flexible pipe extracted from this gasification tunnel to any one gasification tunnel, 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 multiple gasification tunnel is communicated to the technological means of waste oil well or waste gas well respectively, so, by a vertically-oriented well to the waste oil well in different orientation or waste gas well construction horizontal orientation well, greatly save construction cost.Be interconnected when the other end that have employed multiple gasification tunnel and share a waste oil well or waste gas well, one end of multiple gasification tunnel is respectively arranged with gasifying agent import, gasifying agent import is vertically-oriented well, be provided with in each vertically-oriented well and can insert and the continuous flexible pipe extracted from this gasification tunnel to gasification tunnel, 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 discharge, be conducive to enhancing productivity.

4, the technological means that is communicated with the effective fuel gas inlet in the coal seam of chemical industry synthesis unit with the effective fuel gas inlet in the coal seam of generator unit respectively due to the effective gas outlet in coal seam that have employed purification separation unit of the technical program, so, external electrical energy drive equipment can be introduced, realization is gathered materials on the spot, generate electricity driving arrangement on the spot, self-sufficient, circulation is produced, and eliminates the laying of very long transmission line of electricity, greatly save circuit cost, for wellbore construction provides larger convenience.

5, the technical program is owing to have employed the steam H of generator unit ₂the steam H in O outlet and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The steam H of chemical industry synthesis unit ₂the steam H in O outlet and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The CO of Oil-gas Separation unit ₂the steam H in gas vent and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The CO of gas gas separative element ₂the steam H in gas vent and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The technological means that the offgas outlet of chemical industry synthesis unit is communicated with the inlet exhaust gas of generator unit, so, achieve water vapour H ₂o and CO ₂recycling of gas, turns waste into wealth, and is conducive to the unlimited generation of gasifying agent.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the method and system that fossil energy low-carbon (LC) of the present invention is adopted altogether is described in further detail.

Fig. 1 is the fossil energy low-carbon (LC) of the present invention system syndeton of adopting altogether and workflow schematic diagram.

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.

Detailed description of the invention

As shown in Figure 1 to Figure 3, the invention provides a kind of method that fossil energy low-carbon (LC) is adopted altogether, (as can be seen from Figure 3, this region is followed successively by from top to bottom: topsoil 11, mantlerock 12, coal seam 20, middle rock stratum 13, gas-bearing formation 8, lower rock stratum 14 and oil reservoir 7 in the region coexisted at coal seam 20 and oil reservoir 7 and/or gas-bearing formation 8.Certainly, this region also can be the structure of other distribution, if coal seam 20, gas-bearing formation 8, oil reservoir 7 are generally within the structure of the mutual adjacent distributions of same level), gather the coal seam air mixture in coal seam 20, by the CO in the air mixture of coal seam ₂gas separaion out, the CO will separated by described below underground gasification method (certainly, also can by traditional gasification process) 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 the crude oil of discharge and the gas-bearing formation air mixture of discharge respectively.

Present embodiment is owing to have employed the CO that will separate 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.CO in press-in oil reservoir ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas discharges oil reservoir (this part CO together with crude oil ₂gas is recycled further by improvement below).CO in press-in gas-bearing formation ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas-bearing formation (this part CO is discharged after combustion gas mixing in gas and gas-bearing formation ₂gas is recycled further by improvement below).As can be seen here, the method by adopting altogether not only can be gathered materials on the spot and be taken full advantage of CO ₂crude oil or combustion gas are discharged by gas, need not adopt outward transport CO ₂crude oil (comprising viscous crude) and combustion gas can be exploited out by the method for gas, significantly reduce cost of production, are conducive to gathering the crude oil of discharge and the combustion gas of discharge more up hill and dale, and, give CO again ₂gas finds a permanent place of taking shelter, can by CO ₂gas is discharged in air, avoids contaminated environment, achieves the beneficial effect of low-carbon (LC) exploitation fossil energy.

One as present embodiment is improved, and as shown in Figures 2 and 3, the coal seam air mixture in described collection coal seam 20 coal seam air mixture to be discharged by waste oil well and/or waste gas well in underground generation coal seam air mixture by underground gasification method.

Present embodiment is the technological means of coal seam air mixture being discharged in underground generation coal seam air mixture and by waste oil well and/or waste gas well by underground gasification method owing to have employed the coal seam air mixture gathered in coal seam, like this, just coal mining out need not be transported to ground to gasify to coal again, by waste oil well and/or waste gas well, coal seam air mixture is discharged, eliminate the operation getting out gas well, so, can reduce costs further.Certainly, the coal seam air mixture gathered in coal seam can also be used conventional methods.

Further improve as present embodiment, as shown in Figure 2, the described region (i.e. oil well air inlet port 71 and oil well oil-out 72) gathering the crude oil place of discharging from the close-by examples to those far off advances to the right step by step, the described region (i.e. gas well air inlet port 81 and gas well gas outlet 82) gathering the gas-bearing formation air mixture of discharging from the close-by examples to those far off advances to the right step by step, or, the described region (i.e. gas well air inlet port 81 and gas well gas outlet 82) gathering the region (i.e. oil well air inlet port 71 and oil well oil-out 72) at the crude oil place of discharging and the gas-bearing formation air mixture of described collection discharge advances to the right simultaneously, correspondingly, the region (i.e. gasifying agent import 22 and coal seam air mixture outlet 23) of the coal seam air mixture in described collection coal seam 2 is followed and is gathered synchronously advancing of the region of the region at the crude oil place of discharging and/or the gas-bearing formation air mixture of described collection discharge below to the right described.Certainly, above-mentioned progradation also can be advance left, boost, advance (relative to Fig. 2) downwards.

Present embodiment is from the close-by examples to those far off pushed ahead step by step owing to have employed the region gathering the crude oil place of discharging, the region gathering the gas-bearing formation air mixture of discharging from the close-by examples to those far off is pushed ahead step by step, and the region gathering the crude oil place of discharging and the region gathering the gas-bearing formation air mixture of discharging are pushed ahead simultaneously; Correspondingly, the technological means of synchronously pushing ahead in the region of the gas-bearing formation air mixture of discharging in the region and/or described collection that gather the crude oil place of discharging is followed in the region gathering the coal seam air mixture in coal seam below, so, whole coal, crude oil and combustion gas resource in the region that coal seam and oil reservoir and/or gas-bearing formation coexist not only can be conducive to gather more up hill and dale, and, waste oil well and/or waste gas well can be utilized more fully, reduce cost of production widely.

Further improve as present embodiment, as shown in Figure 1, will CO be isolated ₂a part for the effective combustion gas in gained coal seam after gas is used for generating; CO will be isolated 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 separaion out obtains oil product; By the CO be mixed in gas-bearing formation air mixture ₂gas separaion out obtains the effective combustion gas of gas-bearing formation.

Present embodiment will isolate CO owing to have employed ₂the technological means of a part for generating electricity of the effective combustion gas in gained coal seam after gas, so, external electrical energy drive equipment can be introduced, realization is gathered materials on the spot, generate electricity driving arrangement on the spot, self-sufficient, circulation is produced, and eliminates the laying of very long transmission line of electricity, greatly save circuit cost, for well-digging construction provides larger convenience.CO will be isolated again owing to have employed 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 separaion out obtains oil product; By the CO be mixed in gas-bearing formation air mixture ₂gas separaion out obtains the technological means of the effective combustion gas of gas-bearing formation, so, not only on the spot Raw material processing can be become primary product, and below can be, further optimization provides advantage.

Further improve again as present embodiment, as shown in Figure 1, the water vapour H produced from the process of generating ₂o is for gathering the coal seam air mixture in coal seam; The water vapour H produced from the process of synthetic natural gas and/or oil product ₂o is for gathering the coal seam air mixture in coal seam; The CO separated from crude oil ₂gas is for gathering the coal seam air mixture in coal seam; The CO separated from gas-bearing formation air mixture ₂gas is for gathering the coal seam air mixture in coal seam; 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 have employed the water vapour H produced from the process of generating ₂o for gathering the coal seam air mixture in coal seam, the water vapour H produced from the process of synthetic natural gas and/or oil product ₂o is for gathering the coal seam air mixture in coal seam, the CO separated from crude oil ₂gas is for gathering the coal seam air mixture in coal seam, the CO separated from gas-bearing formation air mixture ₂gas is for gathering the coal seam air mixture in coal seam, 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) technological means for generating electricity, so, achieve water vapour H ₂o and CO ₂recycling of gas, turns waste into wealth, and is conducive to the unlimited generation of gasifying agent.

As shown in Figure 1 to Figure 3, a kind of system realizing the common mining method of fossil energy low-carbon (LC) provided by the invention, this system is positioned at the region that coal seam 20 and oil reservoir 7 and/or 8 gas-bearing formation coexist, and (as can be seen from Figure 3, this region is followed successively by from top to bottom: topsoil 11, mantlerock 12, coal seam 20, middle rock stratum 13, gas-bearing formation 8, lower rock stratum 14 and oil reservoir 7.Certainly, this region also can be the structure of other distribution, if coal seam 20, gas-bearing formation 8, oil reservoir 7 are generally within the structure of the mutual adjacent distributions of same level), 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 gasification agent outlets that unit 1 produced by gasifying agent import and the gasifying agent of described underground gasification unit 2 is communicated with; The coal seam air mixture outlet of described underground gasification unit and the coal seam air mixture inlet communication 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 upstream and/or gas-bearing formation 8 upstream 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 upstream and/or gas-bearing formation 8 upstream respectively.Certainly, also can be 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 upstream, the CO of another presser unit 6 ₂gas vent is communicated with gas-bearing formation 8 upstream.

As can be seen from Figure 2, the upstream of described oil reservoir 7 is provided 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 upstream of described gas-bearing formation 8 is provided 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 owing to have employed the CO of 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.CO in press-in oil reservoir ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas discharges oil reservoir (this part CO together with crude oil ₂gas is recycled further by improvement below).CO in press-in gas-bearing formation ₂gas has 50% ~ 60% to be for good and all sealed in underground, the CO of in addition 40% ~ 50% ₂gas-bearing formation (this part CO is discharged after combustion gas mixing in gas and gas-bearing formation ₂gas is recycled further by improvement below).As can be seen here, the system by adopting altogether not only can be gathered materials on the spot and be taken full advantage of CO ₂crude oil or combustion gas are discharged by gas, need not adopt outward transport CO ₂crude oil (comprising viscous crude) and combustion gas can be exploited out by the method for gas, significantly reduce cost of production, are conducive to gathering the crude oil of discharge and the combustion gas of discharge more up hill and dale, and, give CO again ₂gas finds a permanent place of taking shelter, can by CO ₂gas is discharged in air, avoids contaminated environment, achieves the beneficial effect of low-carbon (LC) exploitation fossil energy.Again owing to have employed the technological means of underground gasification unit, so, save cost of production widely.Also be provided with gasifying agent import and coal seam air mixture outlet owing to have employed underground gasification unit, the coal seam air mixture outlet of underground gasification unit and the coal seam air mixture inlet communication of purification separation unit, purification separation unit is provided with the effective gas outlet in coal seam and CO ₂the technological means of gas vent, so, for improvement below provides advantage.

One as present embodiment is improved, and 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; Described coal seam air mixture outlet 23 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, in the oil pipe of described waste oil well, the bottom of this waste oil well is provided with stop grouting plug 26; With slip casting 27 filling 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 (see Fig. 3, rock stratum 13, gas-bearing formation 8 and lower rock stratum 14 namely) thickness; Adopt directional blasting or perforating methods to implement to destroy to the oil pipe tube wall being positioned at 20 sections, coal seam, oil pipe is communicated with described gasification tunnel 21; The connectivity part of oil pipe and described gasification tunnel 21 forms gas condensates warehouse to the cavity between described slip casting 27 end face; Described being formed by the transformation of waste gas well is that tracheal strips at described waste gas well is provided with stop grouting plug 26 near the bottom of this waste gas well; To tracheal strips slip casting 27 filling; The height of slip casting 27 is 1/3 to 2/3 of separation layer between coal seam 20 and gas-bearing formation 8 (see Fig. 3, rock stratum 13 namely) thickness; Adopt directional blasting or perforating methods to implement to destroy to the tracheae tube wall being positioned at 20 sections, coal seam, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms gas condensates warehouse to the cavity between described slip casting 27 end face.

Present embodiment comprises owing to have employed underground gasification unit 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 transformed by waste oil well and/or waste gas well, so, greatly can reduce the construction cost of underground gasification unit.Again because the bottom that have employed near this waste oil well in the oil pipe of waste oil well is provided with stop grouting plug; Grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the oil pipe tube wall being positioned at coal seam section, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms the technological means of gas condensates warehouse to described slip casting end face, so construction is more prone to.Similarly, have employed, at the tracheal strips of waste gas well, the bottom of this waste gas well is provided with stop grouting plug; To tracheal strips grouting filling; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the tracheae tube wall being positioned at coal seam section, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms the technological means of gas condensates warehouse to described slip casting end face, construction is also more prone to.

Further improve as present embodiment, as shown in Figures 2 and 3, described gasification tunnel 21 has multiple; Multiple described gasification tunnel 21 linearly shape being horizontally disposed with; One end of multiple described gasification tunnel 21 is interconnected and shares a gasifying agent import 22, described gasifying agent import 22 is vertically-oriented wells, be provided with in described vertically-oriented well and can insert and the continuous flexible pipe 24 extracted from this gasification tunnel to any one gasification tunnel, 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 multiple described gasification tunnel 21 is communicated to described waste oil well or waste gas well respectively.Certainly, also can be that the other end of multiple described gasification tunnel 21 is interconnected and shares a waste oil well or waste gas well; One end of multiple described gasification tunnel is respectively arranged with gasifying agent import 22, described gasifying agent import 22 is vertically-oriented wells, be provided with in vertically-oriented well described in each and can insert and the continuous flexible pipe 24 extracted from this gasification tunnel to gasification tunnel, the lateral wall of continuous flexible pipe 24 described in each is connected with the top seal of the vertically-oriented well in place, and described in each, the top of vertically-oriented well all has steam H ₂o and CO ₂the import 25 of gas.

Present embodiment has multiple owing to have employed gasification tunnel; Multiple gasification tunnel linearly shape being horizontally disposed with; One end of multiple gasification tunnel is interconnected and shares a gasifying agent import, gasifying agent import is vertically-oriented well, be provided with in vertically-oriented well and can insert and the continuous flexible pipe extracted from this gasification tunnel to any one gasification tunnel, 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 multiple gasification tunnel is communicated to the technological means of waste oil well or waste gas well respectively, so, by a vertically-oriented well to the waste oil well in different orientation or waste gas well construction horizontal orientation well, greatly save construction cost.Be interconnected when the other end that have employed multiple gasification tunnel and share a waste oil well or waste gas well, one end of multiple gasification tunnel is respectively arranged with gasifying agent import, gasifying agent import is vertically-oriented well, be provided with in each vertically-oriented well and can insert and the continuous flexible pipe extracted from this gasification tunnel to gasification tunnel, 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 discharge, be conducive to enhancing productivity.

Further improve as present embodiment, 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 the coal seam of chemical industry synthesis unit 4 with the effective fuel gas inlet in the coal seam of generator unit 5 respectively; Described generator unit 5 is provided with steam H ₂o outlet and inlet exhaust gas; Described chemical industry synthesis unit 4 is provided with steam H ₂o outlet and offgas outlet; Described oil reservoir 7 downstream is communicated with the crude oil import of Oil-gas Separation unit 9; Described Oil-gas Separation unit 9 is provided with CO ₂gas vent; The gas-bearing formation air mixture inlet communication of described gas-bearing formation 8 downstream and 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 downstream is 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 downstream is provided with gas well gas outlet 82, the gas-bearing formation air mixture inlet communication of described gas well gas outlet 82 and gas gas separative element 10.

The technological means that present embodiment is communicated with the effective fuel gas inlet in the coal seam of chemical industry synthesis unit with the effective fuel gas inlet in the coal seam of generator unit respectively due to the effective gas outlet in coal seam that have employed purification separation unit, so, external electrical energy drive equipment can be introduced, realization is gathered materials on the spot, generate electricity driving arrangement on the spot, self-sufficient, circulation is produced, and eliminates the laying of very long transmission line of electricity, greatly save circuit cost, for well-digging construction provides larger convenience.Steam H is provided with again owing to have employed generator unit ₂o outlet and inlet exhaust gas; Chemical industry synthesis unit is provided with steam H ₂o outlet and offgas outlet; Oil reservoir downstream is communicated with the crude oil import of Oil-gas Separation unit; Oil-gas Separation unit is provided with CO ₂gas vent; The gas-bearing formation air mixture inlet communication of gas-bearing formation downstream and gas gas separative element; Gas gas separative element is provided with CO ₂the technological means of gas vent, so, not only on the spot Raw material processing can be become primary product, and below can be, further optimization provides advantage.

Further improve again as present embodiment, as shown in Figure 1, the steam H of described generator unit 5 ₂the steam H in O outlet and described vertically-oriented aboveground portion ₂o and CO ₂gas feed 25 is communicated with; The steam H of described chemical industry synthesis unit 4 ₂the steam H in O outlet and described vertically-oriented aboveground portion ₂o and CO ₂gas feed 25 is communicated with; The CO of described Oil-gas Separation unit 9 ₂the steam H in gas vent and described vertically-oriented aboveground portion ₂o and CO ₂gas feed 25 is communicated with; The CO of described gas gas separative element 10 ₂the steam H in gas vent and described vertically-oriented aboveground portion ₂o and CO ₂gas feed 25 is communicated with; The offgas outlet of described chemical industry synthesis unit 4 is communicated with the inlet exhaust gas of described generator unit 5.

Present embodiment is owing to have employed the steam H of generator unit ₂the steam H in O outlet and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The steam H of chemical industry synthesis unit ₂the steam H in O outlet and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The CO of Oil-gas Separation unit ₂the steam H in gas vent and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The CO of gas gas separative element ₂the steam H in gas vent and vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The technological means that the offgas outlet of chemical industry synthesis unit is communicated with the inlet exhaust gas of generator unit, so, achieve water vapour H ₂o and CO ₂recycling of gas, turns waste into wealth, and is conducive to the unlimited generation of gasifying agent.

Operating principle of the present invention and concrete technology parameter 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, while gasification is mined, and the CO of generation ₂the press-in oil reservoir displacement of reservoir oil after being separated also is stored.In this system, unit produced by gasifying agent, and air separation is become O ₂and N ₂, and by O ₂, steam, CO ₂be mixed into gasifying agent Deng in proportion and inject underground coal gasification(UCG) unit; In underground gasification unit, coal seam high-temperature oxygen is lighted, coal seam and gasifying agent are burnt, gasifies, pyrolytic reaction generates mixed gas, and import purification separation unit; Available gas (H is separated into after mixed gas purifies by gas purification and separative element 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 the chemical products such as natural gas, oil product by available gas; Presser unit is by CO ₂oil well air inlet port is sent in compression, about has the CO of 50% ~ 60% ₂be stored in underground by permanent envelope, gather oil gas at oily oil inlet and outlet, carry out Oil-gas Separation, obtain oil product and CO ₂gas, CO ₂the steam of gas and chemical industry synthesis unit and generator unit generation enters underground gasification unit as the gasifying agent re-injection of underground gasification unit, makes remaining CO ₂utilized further, the electric energy that generator unit produces is for the power consumption of each unit.Thus achieve the exploitation of fossil energy low-carbon cycle.

At coal and oil, particularly viscous crude association region, utilize abandoned well to set up coal, oily gentle low-carbon (LC) extraction system altogether, comprising: unit produced by gasifying agent, air separation is become O ₂and N ₂, by O ₂rear injection underground gasification unit is mixed by a certain percentage with the afterheat steam of chemical industry and generator unit.

Underground coal gasification(UCG) unit, waste oil well is utilized to go out gas well as underground gasification, subterranean coal gasification unit built by construction directional well, continuous flexible pipe is arranged by directional well, send into gasifying agent, segmented gasification coal seam in directional well to gasification coal seam, generate mixed gas, derived by waste oil well, and mixed gas is imported purification separation unit.

(1) suitable waste oil well is selected to go out gas well as underground gasification, stop grouting plug is placed in 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, adopt directional blasting or perforating technology at the sleeve pipe of coal seam section, destroy the waste oil tube borehole wall, and with coal seam conducting, form out gas well.

(2) to construct in the coal seam near an abandoned well in the middle part of (distance is greater than 200m) or one group of waste oil well directional well, utilize directional horizontal wells technology, to each waste oil well construction directional horizontal wells in coal seam, horizontal well is at bottom, keep at a distance bottom contour interval from being 1/5 ~ 1/10 of coal seam thickness, and link up with the useless oil-well wall destroyed, thus conducting goes out gas well, forms one or more gasification face.

(3) continuous flexible pipe is arranged 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 continuous flexible pipe, coal seam forced oxidation is lighted, normal temperature oxygen is injected by continuous flexible pipe after lighting in coal seam, in the annular space of continuous flexible pipe and directional hole, inject steam and CO ₂mist, make coal combustion, gasification, pyrolysis and producing containing H ₂, CO, CH ₄, CO ₂mixed gas, by go out gas well derive.Gas injection pressure is less than local coal seam hydrostatic pressure.

(4) first gasification chambers are after reaching the coal amount of designed combustion, continuous flexible pipe is retreated 20-80m, coal seam forced oxidation is lighted by the oxygen refilling temperature Approaching Coal Seam burning-point, normal temperature oxygen is injected by continuous flexible pipe after lighting in coal seam, in the annular space of continuous flexible pipe and directional hole, inject steam and CO ₂mist, make coal combustion, gasification, pyrolysis and producing containing H ₂, CO, CH ₄, CO ₂mixed gas, by go out gas well derive, form second gasification chamber, by that analogy, last gas injection position is at the level point of directional well.Another gasification face is started in the same way after a gasification face terminates.

Gas purification separative element, is separated into available gas (H after the mixed gas for being derived by waste oil well purifies 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 the chemical products such as oil, natural gas by available gas; The tail gas of chemical industry synthesis (wherein comprises available gas H ₂, CO, CH ₄) for generating, because effective gas component height can improve synthesis 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, will be separated the CO obtained ₂the oil well displacement of reservoir oil is injected in compression, and pressure is greater than 9MPa, about has the CO of 50% ~ 60% ₂be stored in underground by permanent envelope, collect oil product and effusion CO at producing well ₂, and be separated.

The CO obtained is separated in oil product ₂return underground gasification unit as gasifying agent with the afterheat steam that chemical industry, generating obtain, make the CO of remaining 40 ~ 50% ₂recycled.

CO ₂+C＝2CO

H ₂O+C＝H ₂+CO

Underground gasification unit and presser unit advance takes over layout, can realize the low-carbon cycle exploitation of coal seam and oil reservoir.

Said system and method can also be used for the low-carbon cycle exploitation of the associated resources such as coal and shale gas-bearing formation, oil shale layer, grey association cluster.

At coal and oil, particularly viscous crude association region, reservoir depth 1500 meters, the coal seam degree of depth 1200 meters, coal seam thickness 20 meters, coal seam and oil reservoir spacing 280 meters.Utilize the abandoned well of oil extraction, subterranean coal gasification furnace built by construction directional well, waste oil well goes out gas well as underground gasification furnace, to construct near abandoned well directional well, arrange continuous flexible pipe by directional well, send into gasifying agent to gasification coal seam, segmented gasification coal seam in directional well, generate mixed gas, derived by waste oil well, and mixed gas is imported purification separation unit.Concrete steps are as follows:

(1) two waste oil wells (distance is greater than 400m) are selected to go out gas well as underground gasification, place stop grouting plug in waste oil bottom, by waste oil bottom grouting filling, packed height is 200 meters, the space of the height of 80 meters is stayed, as coal gas condensate warehouse at the bottom of hole.Adopt directional blasting or perforating technology at the sleeve pipe of coal seam section, destroy the waste oil tube borehole wall, and with coal seam conducting, form out gas well.

(2) to construct in the coal seam in the middle part of two abandoned wells directional well, it is target that first-selected selection goes out gas well flatly, utilize directional horizontal wells technology, to well construction directional horizontal wells of giving vent to anger in coal seam, horizontal well is at bottom, horizontal well path keeps at a distance bottom contour interval from being 2 meters, and with the borehole wall conducting destroyed, thus link up out gas well.

(3) continuous flexible pipe is arranged at directional well, end is apart from venthole 50m, the oxygen of implantation temperature Approaching Coal Seam burning-point in continuous flexible pipe, coal seam forced oxidation is lighted, after coal seam is lighted, inject normal temperature oxygen by continuous flexible pipe, in the annular space of continuous flexible pipe and directional hole, inject steam and CO ₂mist, make coal combustion, gasification, pyrolysis and producing containing H ₂, CO, CH ₄, CO ₂mixed gas, by go out gas well derive.Gas injection pressure is less than local coal seam hydrostatic pressure.

(4) first gasification chambers are after reaching the coal amount of designed combustion, continuous flexible pipe is retreated 50m, coal seam forced oxidation is lighted by the oxygen refilling temperature Approaching Coal Seam burning-point, normal temperature oxygen is injected by continuous flexible pipe after lighting in coal seam, in the annular space of continuous flexible pipe and directional hole, inject steam and CO ₂mist, make coal combustion, gasification, pyrolysis and producing containing H ₂, CO, CH ₄, CO ₂mixed gas, by go 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 terminates, continuous flexible pipe is proposed.

(5) utilize the vertical section of directional hole, in the same way to the directed lateral aperture of another well construction of giving vent to anger, transfer continuous flexible pipe, gasify another work plane.

(6) be illustrated in figure 3 guarantee production capacity demand, multiple directional well can be had simultaneously to gasify.

The gas well that goes out that underground gasification raw gas is transformed by waste oil well is derived, and derives available gas (H respectively in ground purification separation ₂, CO, CH ₄) and CO ₂.Available gas imports chemical industry synthesis unit, CO ₂import presser unit.

Available gas is used for chemical industry synthesis, produces methane or oil product, and the tail gas of chemical industry synthesis (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 synthesis and generating efficiency.

The CO obtained will be separated ₂the oil well displacement of reservoir oil is injected in compression, and pressure is greater than 9MPa, about has the CO of 50% ~ 60% ₂be stored in underground by permanent envelope, collect oil product and effusion CO at producing well ₂, and be separated.

The CO obtained is separated in oil product ₂return underground gasification unit as gasifying agent with the afterheat steam that chemical industry, generating obtain, make the CO of remaining 40 ~ 50 ₂gas is recycled.

To construct in coal seam in the middle part of one group of waste oil well directional well, multiple gasification face can be formed.Underground gasification unit and presser unit advance takes 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 detailed description of the invention, and those skilled in the art's technical scheme according to the present invention draws other embodiment, belongs to the technology of the present invention innovation scope equally.

Claims

1. a fossil energy low-carbon (LC) method of adopting altogether, is characterized in that:

Use the system that fossil energy low-carbon (LC) is adopted altogether, this system is positioned at the region 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 and the coal seam air mixture inlet communication 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;

In the region that coal seam and oil reservoir and/or gas-bearing formation coexist, gather the coal seam air mixture in coal seam, by the CO in the air mixture of coal seam ₂gas separaion out, 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 the crude oil of discharge and the gas-bearing formation air mixture of discharge respectively.

2. the fossil energy low-carbon (LC) according to claim 1 method of adopting altogether, is characterized in that: the coal seam air mixture in described collection coal seam is in underground generation coal seam air mixture by underground gasification method; Described underground gasification method is the oxygen of gasification tunnel implantation temperature Approaching Coal Seam burning-point in coal seam, 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 producing containing H ₂, CO, CH ₄, CO ₂coal seam air mixture; The air mixture of described coal seam is gone out by the waste oil well that is communicated with coal seam and/or waste gas well array.

3. the fossil energy low-carbon (LC) according to claim 2 method of adopting altogether, it is characterized in that: the described region gathering the crude oil place of discharging from the close-by examples to those far off is pushed ahead step by step, the described region gathering the gas-bearing formation air mixture of discharging from the close-by examples to those far off is pushed ahead step by step, or the described region gathering the region at the crude oil place of discharging and the gas-bearing formation air mixture of described collection discharge is pushed ahead simultaneously; Correspondingly, the region of the coal seam air mixture in described collection coal seam is followed and is gathered synchronously pushing ahead of the region of the region at the crude oil place of discharging and/or the gas-bearing formation air mixture of described collection discharge below described.

4. the fossil energy low-carbon (LC) according to claim 1 method of adopting altogether, is characterized in that: will isolate CO ₂a part for the effective combustion gas in gained coal seam after gas is used for generating; CO will be isolated 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 separaion out obtains oil product; By the CO be mixed in gas-bearing formation air mixture ₂gas separaion out obtains the effective combustion gas of gas-bearing formation.

5. the fossil energy low-carbon (LC) according to claim 4 method of adopting altogether, is characterized in that: the water vapour H produced from the process of generating ₂o is for gathering the coal seam air mixture in coal seam; The water vapour H produced from the process of synthetic natural gas and/or oil product ₂o is for gathering the coal seam air mixture in coal seam; The CO separated from crude oil ₂gas is for gathering the coal seam air mixture in coal seam; The CO separated from gas-bearing formation air mixture ₂gas is for gathering the coal seam air mixture in coal seam; The tail gas produced from the process of synthetic natural gas and/or oil product is for generating.

6. being total to a system for mining method for realizing fossil energy low-carbon (LC) as claimed in claim 1, it is characterized in that: this system is positioned at the region 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 and the coal seam air mixture inlet communication 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 fossil energy low-carbon (LC) according to claim 6 system of adopting altogether, is characterized in that: described gasification unit is 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, in the oil pipe of described waste oil well, the bottom of this waste oil well is provided with stop grouting plug; Grouting filling in oil pipe; The height of slip casting is 1/3 to 2/3 of coal seam and zonal isolation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the oil pipe tube wall being positioned at coal seam section, oil pipe is communicated with described gasification tunnel; The connectivity part of oil pipe and described gasification tunnel forms gas condensates warehouse to the cavity between described slip casting end face; Described being formed by the transformation of waste gas well is that tracheal strips at described waste gas well is provided with stop grouting plug near the bottom of this waste gas well; To tracheal strips grouting filling; The height of slip casting is 1/3 to 2/3 of coal seam and gas-bearing formation separation layer thickness; Adopt directional blasting or perforating methods to implement to destroy to the tracheae tube wall being positioned at coal seam section, tracheae is communicated with described gasification tunnel; The connectivity part of tracheae and described gasification tunnel forms gas condensates warehouse to the cavity between described slip casting end face.

8. the fossil energy low-carbon (LC) according to claim 7 system of adopting altogether, is characterized in that: described gasification tunnel has multiple; Multiple described gasification tunnel linearly shape being horizontally disposed with; One end of multiple described gasification tunnel is interconnected and shares a gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with in described vertically-oriented well and can insert and the continuous flexible pipe extracted from this gasification tunnel to any one gasification tunnel, 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 multiple described gasification tunnel is communicated to described waste oil well or waste gas well respectively; Or the other end of multiple described gasification tunnel is interconnected and shares a waste oil well or waste gas well; One end of multiple described gasification tunnel is respectively arranged with gasifying agent import, described gasifying agent import is vertically-oriented well, be provided with in vertically-oriented well described in each and can insert and the continuous flexible pipe extracted from this gasification tunnel to gasification tunnel, described in each, the lateral wall on continuous flexible pipe top is connected with the top seal of the vertically-oriented well in place, and described in each, the top of vertically-oriented well all has steam H ₂o and CO ₂the import of gas, the initial distance between the outlet of continuous flexible pipe bottom described in each and the corresponding described gasification tunnel other end is 20-80m.

9. the fossil energy low-carbon (LC) according to claim 8 system of adopting 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 the coal seam of chemical industry synthesis unit with the effective fuel gas inlet in the coal seam of generator unit respectively; Described oil reservoir downstream is communicated with the crude oil import of Oil-gas Separation unit; The gas-bearing formation air mixture inlet communication of described gas-bearing formation downstream and gas gas separative element.

10. the fossil energy low-carbon (LC) according to claim 9 system of adopting altogether, is characterized in that: described chemical industry synthesis unit is provided with steam H ₂o outlet and offgas outlet; Described generator unit is provided with steam H ₂o outlet and inlet exhaust gas; The steam H of described chemical industry synthesis unit ₂the steam H in O outlet and described vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The steam H of described generator unit ₂the steam H in O outlet and described vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with; The offgas outlet of described chemical industry synthesis unit is communicated with the inlet exhaust gas 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 in gas vent and described vertically-oriented aboveground portion 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 in gas vent and described vertically-oriented aboveground portion ₂o and CO ₂gas feed is communicated with.