CN101493007A - Natural gas separation and waste gas geological sequestration method based on mixed fluid self-separation - Google Patents
Natural gas separation and waste gas geological sequestration method based on mixed fluid self-separation Download PDFInfo
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- CN101493007A CN101493007A CNA2008102463040A CN200810246304A CN101493007A CN 101493007 A CN101493007 A CN 101493007A CN A2008102463040 A CNA2008102463040 A CN A2008102463040A CN 200810246304 A CN200810246304 A CN 200810246304A CN 101493007 A CN101493007 A CN 101493007A
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Abstract
The invention discloses a natural gas separation and waste gas geological sealing up method based on mixed fluid self-separation, comprising the following steps: firstly, an injection well and a discharge well are formed at a selected geological sealing up place; secondly, natural gas containing impurities such as CO2, H2S, Sox, NOx and NH3 is continuously injected into a geological separation layer through the injection well by a high-pressure injection device; thirdly, fluid transferred to the discharge well is released through the discharge well; fourthly, injection of the mixed fluid and release of the discharge well are continuously carried out till the concentration of total volume of hydrocarbon gases such as methane, ethane and propane in the fluid discharged from the discharge well is below the economic concentration value. In the separation process, double targets of separation of natural gas from impurity gas and the sealing up of the waste gas are realized. The method is applied to the fields of natural gas separation, waste gas geological sealing up, especially natural gas initial separation and waste gas geological sealing up engineering.
Description
Technical field
The present invention relates to a kind of natural gas geology separation method based on the fluid-mixing self-separation, relate in particular to a kind of natural gas geology based on the fluid-mixing self-separation and separate and discard gas geology method of seal, mainly utilize geologic structure characteristic, foreign gas highly dissoluble matter and the fluid-mixing hydrodynamic force phenomenon of in the stratum, moving in formation water to realize that the geology of natural gas self-separation process and discarded gas seals double goal up for safekeeping.
Background technology
It is higher to contain in the natural gas of a large amount of foreign gases, particularly China general sulfur content in the natural gas, need carry out the natural gas separation process.The main method of the natural gas in whole world separation at present has: methods such as amine method, mixed amine technology, Benfield method, Sulfinol method, Sulfatreat method, low-temp methanol washing process, physical cleaning, liquefying separation process, transformation adsorption separation technology, membrane separation technique, low-temperature fractionation technology, in natural gas separates, obtain utilization preferably, in natural gas separates, also obtained good effect.
The discarded gas high pressure that discarded gas geology method of seal mainly arrives purity more than 90% injects geologic structure, realizes the method that discarded gas and Atmospheric Long-term are isolated, as: CO
2, H
2S, SO
2, SO
3, N
2O, NO, NO
2, NH
3Gas.The existing place type of sealing up for safekeeping mainly contains: in the geological structures such as oil and natural gas reservoir, aquifer, deep, the coal seam that can not exploit, basalt, cave, rock salt chamber.In each type, the geology of discarded gas is sealed up for safekeeping all will discard gas compression injection deep formation.Various waste gas geology are sealed engineering up for safekeeping in industry and the operation of commercial-scale stage, and discarded gas abatement effect is very good.
Above natural gas separation method all adopts industrial process to carry out the separation process of natural gas, wherein the proportion of separation costs in whole gas cost of discarded gas is very large, if can reduce the separation costs of foreign gas, then can reduce the cost of production of whole natural gas greatly; Foreign gas in the natural gas belongs to discarded gas category substantially, if can realize the geology of discarded gas in separating natural gas process simultaneously seals up for safekeeping, then whole natural gas separation process can reach the natural gas separation and discard the dual purpose that gas is sealed up for safekeeping, can realize that natural gas separates, discards gas abatement, environmental benefit and reduces discharging the multiple benefits such as economic interests of concluding the business and realizing.
Summary of the invention
The objective of the invention is to be to provide the method that a kind of natural gas based on the fluid-mixing self-separation separates and discarded gas geology is sealed up for safekeeping, it is a kind of economy, simple, effective method.This invention is brand-new natural gas separation method, can reduce the separation costs of natural gas significantly, natural gas separation process simultaneously can reach the natural gas separation and discard the dual purpose that gas is sealed up for safekeeping, can realize the initial gross separation of natural gas, discarded gas abatement, environmental benefit and the multiple benefits such as economic interests that reduce discharging the transaction realization.
Conventional separation method of natural gas and discarded gas geology are sealed technology up for safekeeping, for proposition of the present invention is laid a good foundation.In order to realize above-mentioned purpose, the present invention comprises the following steps: successively
1. seal the place up for safekeeping in selected geology and form injection well and drainage well, run through the cap rock always and enter the geology separating layer;
2. will contain the natural gas fluid-mixing of discarded gas continuously by injecting well injection geology separating layer by high pressure injection device (gas tank, high pressure such as booster pump, high-pressure pump, supercharging equipment).Foreign gas composition in the natural gas comprises: carbon dioxide, sulfur dioxide, hydrogen sulfide, sulfur trioxide, nitrous oxide, nitrogen oxide, nitrogen dioxide, ammonia (CO
2, SO
2, H
2S, SO
3, N
2O, NO
2, NO, NH
3) a kind of any mixing of or two to eight kinds of gases in the gas.The volumetric concentration scope of foreign gas is between 0.5%～90%.The concentration of the hydrocarbon gas that the amount of injecting gas discharges according to drainage well is lower than till the economic concentration.
3. after fluid-mixing injects certain hour (1 day to 2 years), discharge the fluid-mixing of moving to drainage well by drainage well;
4. continue to carry out the injection of fluid-mixing and the release of drainage well, till the total concentration of low-carbon (LC) hydrocarbon gas such as methane, ethane, propane is lower than economic concentration value in the fluid that drainage well is discharged, stop whole separation process.Thereby realize the separation of the foreign gas of natural gas, obtain hydrocarbon gas, seal foreign gas simultaneously up for safekeeping.
Preferred version is, the geology separating layer is the aquifer, deep, geology is sealed the place up for safekeeping and is comprised an injection well and a drainage well at least, can an injection well and two drainage wells corresponding with it be set according to the geological conditions needs, perhaps two injection wells and corresponding three drainage wells are understandable that, discharging is advanced and injected between well and should be provided with at interval, can inject well and producing well well layout mode, wherein a kind of layout such as Fig. 7 with reference to the oil field.
In addition, (0.1MPa～50MPa) does not separate out in a large number and is as the criterion to be dissolved in around the drainage well in the formation water foreign gas to need the pressure of control drainage well well head.
Operating principle of the present invention:
The present invention mainly utilizes CO
2, SO
3, SO
2, N
2O, NO
2, NO, H
2S, NH
3The solubility of foreign gas in water is far longer than solubility, earth formation and natural gas fluid-mixing the hydrodynamic force characteristics in stratum transition process of hydrocarbon gas in water body such as methane, ethane, propane, butane.To adopt the high pressure injection device that fluid-mixing is injected the geology separating layer by injecting well down at certain pressure (1MPa-50MPa) from the impure natural gas that directly obtains gas field and other sources of the gas.The commitment that fluid-mixing injects, the fluid-mixing that injects mainly arranges the water of geology separating layer porous media, occupy the partially porous dielectric space of sealing up for safekeeping in the stratum, shown in Fig. 1 .1, partially mixed fluid is bound in or is dissolved in the porous media pore water.For the bigger sand layers of thickness, because the density of formation water is greater than the density of injecting fluid-mixing, fluid-mixing is in the process that arranges and drive formation fluid, fluid-mixing density is less than deep formation water, fluid-mixing is subjected to upwards migration of buoyancy effect, simultaneously because the low viscosity of natural gas fluid-mixing (coefficient of viscosity of fluid-mixing far hangs down the coefficient of viscosity with water), fluid-mixing is mainly along the advantage migration of bottom, upper cap rock stratum, the speed that fluid-mixing moves along cap rock bottom is greater than the migration velocity along base plate, form the inverted triangle natural gas fluid-mixing zone 31 among Fig. 1, formation water zone 32, relatively difference is significantly regional (according to water saturation differentiation in the stratum for 33 3 of fluid-mixing and formation water boundary zones, the water saturation in natural gas fluid-mixing zone is less than 90%, the water saturation in formation water zone is greater than 96%, and middle water saturation zone is fluid-mixing and formation water boundary zone).Special transition process in the oblique structure stratum, fluid-mixing is faster along the speed of cap rock bottom migration, and fluid-mixing forms the inverted triangle fluid-mixing zone 31 among Fig. 1 .2 along the longer distance of cap rock migration in the identical time.Various compositions in the fluid-mixing are constantly dissolving in transition process, and along with the time, the gas componant of the medium and small solubility of fluid-mixing can form the passage that is communicated with, fluid-mixing zone 31 shown in Fig. 1 .3 in cap rock bottom.After forming communication passage, the natural gas fluid-mixing is constantly with understratum water effect, wherein solvable composition mainly is dissolved in the formation water by forms such as dissolving and molecular diffusion, convection current, waterpower disperse, density currents, undissolved fluid-mixing composition will compile by fornix or the little ridge of communication passage in trap structure, by drainage well this part gas is discharged the stratum, will seal most CO up for safekeeping in the geology separating layer like this
2, SO
3, SO
2, N
2O, NO
2, NO, H
2S, NH
3Gas, the gas of other little solubility can be discharged well array and go out to seal up for safekeeping outside the stratum, are mainly the hydrocarbon gas of little solubility such as methane, ethane, propane, thus realize natural gas foreign gas separation with seal up for safekeeping.For the thin layer aquifer, inverted triangle fluid-mixing zone among Fig. 1 .2 can not appear, but because the impure relative glassware for drinking water of natural gas fluid-mixing has lower viscosity, fingering can take place in impure natural gas fluid-mixing in transition process, the gravity density current, can cause the generation of various advantage flow phenomenons in the reaction flow process of capillary tension effect and fluid-mixing and rock, as shown in Figure 6, in sealing the stratum up for safekeeping, form the advantage flow channel, cause the natural gas fluid-mixing to replace and seal few part water in the layer up for safekeeping, foreign gas in the natural gas can enter in the underground water by the mode of dissolving, hydrocarbon gas in the natural gas comes together in by the advantage flow channel near the exhaust shaft, can realize the separation of foreign gas equally and seal process up for safekeeping.
Fluid-mixing arrives near the initial stage of drainage well, does not also have the composition overwhelming majority of constraint and dissolving to be low-carbon (LC) hydrocarbon gas such as methane, ethane, propane, butane in the fluid-mixing, and seldom part is CO
2, H
2S, SO
2, SO
3, N
2O, NO
2, NO, NH
3Foreign gas, the fluid composition that drainage well is discharged is mainly hydrocarbon gas such as methane, ethane, propane, along with the development of injection process, high concentration impurities gas CO
2, SO
3, SO
2, N
2O, NO
2, NO, H
2S, NH
3Can move to the drainage well direction, so the foreign gas concentration in the drainage well can be more and more higher.After the foreign gas volumetric concentration of drainage well surpasses economic concentration, separation process can stop, as discarding gas total concentration and hydrocarbon gas concentration in Fig. 3 drainage well in time shown in the variation relation figure, the variation of discarded gas in the stratum of sealing up for safekeeping can be sealed guide up for safekeeping referring to discarded gas geology, guarantees to discard the safety that gas is sealed engineering up for safekeeping.
The present invention has following advantage and good effect:
Utilize the stratum to carry out the natural gas initial gross separation, be expected to reduce significantly the separation costs of natural gas; Soluble impurity gas in the separating natural gas can realize that natural gas foreign gas is separated and foreign gas (discarded gas) geology is sealed dual purpose up for safekeeping, reduces the foreign gas discharging in the conventional separation process, realizes economy and environmental protection double goal.
The present invention is applicable to the natural gas separation field, is applicable to seal discarded gas geology up for safekeeping field, is particularly suitable for dome structure and separates with natural gas under the tilted stratum condition and discard gas geology and seal engineering up for safekeeping.
The aquifer refers to: the oil-gas Layer after aquifer, deep, the waterpower invasion.Discarded gas geology is sealed layer up for safekeeping and natural gas geology separating layer is same stratum, utilizes the stratum to separate simultaneously and seal up for safekeeping.
Description of drawings
Fig. 1 .1 is the schematic diagram that fluid-mixing injects the initial stage;
Fig. 1 .2 is that fluid-mixing forms the communication passage schematic diagram in sealing the stratum up for safekeeping;
Fig. 1 .3 is that fluid-mixing arrives the drainage well schematic diagram;
Fig. 2 is a horizontal plane schematic diagram of the present invention;
Fig. 3 is discarded gas total concentration and hydrocarbon gas concentration variation relation figure in time in the drainage well;
Fig. 4 seals generalized section (multilayer horizontal well) up for safekeeping under many strata condition;
Fig. 5 is the generalized section of sealing up for safekeeping under the acline situation;
Fig. 6 is the advantage flow schematic diagram of fluid-mixing in the flagstone layer;
Fig. 7 adopts the injection well of peupendicular hole pattern and the well site layout schematic diagram of drainage well.
Fig. 8 is that hydrocarbon gas and the foreign gas volume ratio in the drainage well in the example concerns over time.
Wherein:
10-injects well;
11-injects the flat part of well water;
12-injects the well vertical component.
The 20-drainage well;
21-drainage well horizontal component;
22-drainage well vertical component.
(formation fluid zone dividing condition)
31-fluid-mixing zone;
32-formation water zone;
33-fluid-mixing and formation water boundary zone (mixed zone).
(formation lithology dividing condition)
41-cap rock;
42-base plate (or intermediate course);
43-seals the stratum up for safekeeping;
The 44-fornix.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples:
This method is that the part technology in the conventional method stands good in the present invention to the innovation of discarded gas geology method of seal and natural gas separation method.Traditional measures such as natural gas separation method employing industrial process separate, the present invention utilizes formation water as lyosoption, similar and solvent absorption, seal the formation water that absorbs foreign gas simultaneously up for safekeeping, be equivalent to the conventional method specific descriptions that combine with method of the present invention, this method is separated the impure natural gas in back may still need traditional method to separate once more, but the natural gas separation costs that carries out after the initial gross separation reduces significantly.
1, select and preparation work about the place:
The present invention is applicable to aquifer, general deep, be specially adapted to trap geological structure preferably, fold building or tilted stratum condition, the aquifer, deep of sealing up for safekeeping has good cap rock (41) or top board, be generally shale, mud stone, densifications such as slate, complete continuous, the rock stratum of hyposmosis, require the transmission coefficient of cap rock (41) permeability well below the aquifer, cap rock (41) has higher air-entry value (the capillary tension limit is sealed ability up for safekeeping), and [air-entry value is greater than the mixed-fluid pressure that injects by injection well (10), at least more than the 4MPa, (1MPa-50MPa)], cap rock (41) must not allow to occur passing the strong permeability tomography or the zone of fracture of cap rock continuously in the separation engineering scope.Geological condition for multi-layered aquifer, be strict with the superiors' cap rocks (41) and have the same character, but middle interlayer [being base plate (42) among Fig. 4] is not needed so strict standard, the intermediate course gas leakage, can compile at last layer interlayer or cap rock (41) bottom, influence to whole natural gas separation engineering is little, as shown in Figure 4.
Cap rock (41) preferably has fornix (44) (arch structure or other fornix shape structure) in the aquifer, deep, form collection region in fornix, the fluid of being convenient to compile is concentrated by drainage well (20) and is discharged, shown in Fig. 1 .3, for multi-layered aquifer, same requirement is arranged.If no fornix or tilted stratum, the form in the generalized section of sealing up for safekeeping under Fig. 5 acline situation can be adopted in drainage well (20) position, but the drainage well (20) of relative fornix of emissions operation difficulty or tilted stratum wants big, the uncertainty that flows of fluid is bigger, and it is big that the loss of natural gas useful component is wanted.
Natural gas need be done preliminary treatment before separating, will the higher hydrocarbons in the natural gas liquefaction composition and dust carry out separation engineering after removing, avoid liquefaction in the stratum and loss part hydro carbons composition perhaps stops up hole, cause and inject difficulty.
2,1. about step
Shown in Fig. 1 .1～1.3, the stratum that natural gas of the present invention separates is the aquifer, deep, comprises an injection well (10) and a drainage well (20) at least.The form of injecting well (10) and drainage well (20) is various, can adopt various forms of drilling wells such as peupendicular hole, horizontal well.
Seal the place up for safekeeping in selected geology and form injection well (10) and drainage well (20), run through cap rock (41) always and enter separation stratum (43).
Inject well (10) and drainage well (20) and generally adopt horizontal well technology Cheng Jing, horizontal well comprises: horizontal well technology such as overlength horizontal well, small curve horizontal well, vertical water horizontal well, multi-branched horizontal well, pinniform horizontal well, and referring to the drilling technology of oil and coal industry.The technology of horizontal well is very ripe, can directly adopt.Arrange schematic diagram as the mean level among Fig. 2 and Fig. 4, the vertical component that injects well vertical component (12) and drainage well vertical component (22) passes cap rock (41) and enters trap structure inside, forms to inject the flat part of well water (11) and drainage well horizontal component (21).The similar fluid distribution situation of injecting with peupendicular hole of the fluid distribution situation that adopts horizontal well to inject, as shown in fig. 1.The vertical component of drilling well passes between the well casing of cap rock and the cap rock (41) needs abundant sealing, prevents that fluid-mixing is by the weak seal link separation stratum (43) of escaping out.The horizontal component of drilling well is parallel to the direction of strata as far as possible, realizes that the natural gas on the large tracts of land more separates.
In the wellbore construction process, and the horizontal component of drainage well (21) is positioned at the top of geology separating layer (43) as far as possible, is convenient to collect in the discharging of fornix top or boring surrounding fluid.
The position of injecting well (10) and drainage well (20) depends primarily on stratigraphic structure, drainage well (20) generally is positioned at fornix (44) tip position, mainly be convenient to inject the migration of fluid-mixing and compile, (horizontal well is the spacing of horizontal segment) spacing of injecting well (10) and drainage well (20) is generally 50m～100km, when considering economically, under identical geological conditions, the optimal spacing that injects between well and the drainage well is 250m～10km, can optimize the cost of whole injection process like this.
Injecting the fluid-mixing initial stage, can suitably reduce the whole fluid pressure of sealing the stratum up for safekeeping, can reduce the injection pressure of fluid-mixing then, improving injection by injecting well (10) and modes such as drainage well (20) pump drainage or release pressure.Become to pay particular attention in the well process sealing problem between sleeve pipe withstand voltage and drilling well and the rock stratum, its drilling mode is sealed engineering guide and standard up for safekeeping with reference to sour gas geology, and (similarly publication can be referring to AndyChadwick, Rob Arts, Christian Bernstone, et al, Best Practice for theStorage of CO2 in Saline Aquifers-Observations and Guidelines from theSACS and CO2STORE projects, 2007; Flammable Material Storage Guidelines, 2007, California State, USA).
3,2. about step:
With natural gas, main component is low-carbon (LC) hydrocarbon gas and foreign gas by the high pressure injection device, injects geology separating layer (43) continuously by injecting well (10); The injection pressure lower limit is greater than the pressure (being generally the hydrostatic pressure on stratum) of formation fluid, be limited on the injection pressure under the formation temperature conditions most of low-carbon (LC) hydrocarbon gas in the fluid-mixing become liquid simultaneously fluid density near with or be higher than the density of water, avoid that useful component can't discharge at drainage well (20) in the natural gas.
Obtain under the identical hydrocarbon member condition, it is high more to inject fluid-mixing foreign gas concentration, and the foreign gas of sealing up for safekeeping is also many more, and the corresponding increase of injection rate, injection cost increase; If foreign gas concentration is very low, the cost that injects compression also can increase, the separation costs of natural gas also can increase, therefore necessary balance of between and compromise, the volumetric concentration scope of foreign gas is between 0.5%～90%, preferably can reach between 10%～85%, thereby realize that whole natural gas separates and discard gas to seal the total cost of engineering up for safekeeping minimum.All can use the method for the invention for the natural gas that impure gas is more.
4,3. about step
(control of time needs according to the concentration near the gas drainage well after injecting certain hour, pressure, the monitoring of range is determined, time range is 1 day to 2 years), move near the fluid of drainage well (20) by drainage well (20) discharging release, need to control the pressure of drainage well (20) well head in the discharge process (in the 0.1MPa-20MPa scope, all fine realization the present invention of energy of any one force value in this pressure limit, in the 20Mpa-50MPa scope, any one force value also can realize the present invention in this pressure limit) in certain scope, the foreign gas concentration in the gas is discharged in monitoring in real time, do not allow the dividing potential drop of (promptly controlling the drainage well well head pressure) foreign gas low excessively, cause being dissolved in around the drainage well in the formation water foreign gas and separate out and enter drainage well (20).
The compress control method of drainage well (20) well head:
Above-mentioned described certain hour does not clearly define, and depends primarily on the degree that fluid-mixing is moved to drainage well (20) and compiled bottom fornix (44) or cap rock (41).Generally determine according to monitoring information.The scope of time be fluid time (lower limit) of just having arrived drainage well to fluid compile near the drainage well and displacement well (20) near the moisture of geology separating layer reach about 20% (upper limits) of the volume of geology separating layer.
5,4. about step
Continue to carry out step 2. 3. (repeating step 2. 3. repeatedly, number of times＞5 time, perhaps two steps can be combined into a step, successively inject the natural gas fluid-mixing and constantly discharge the fluid of drainage well), realize following purpose.
Along with the carrying out of injection process and exhaust process, the variation of the hydrocarbon gas ratio in drainage well (20) the discharge fluid-mixing as shown in Figure 3; Be lower than economic concentration value in case monitor hydrocarbon gas concentration, stop fluid-mixing at once and inject, shunt in a well, whole natural gas separates and discards gas and seal engineering up for safekeeping and finish.
Geology among the present invention is sealed the place up for safekeeping: be geology separating layer and above being had living space (comprising the geological structure and the faces of land such as geology separating layer, cap rock stratum, interlayer).
Geology separating layer among the present invention: be mainly the aquifer, deep, be equally applicable to oil-bearing layer, gas-bearing bed after waterpower is invaded; Discarded gas geology is sealed layer up for safekeeping and natural gas geology separating layer is same stratum, utilizes this stratum to separate simultaneously and discarded gas geology is sealed up for safekeeping.It is that 200m is to the 5000m scope that but the realization of less expensive separates with discarding the depth of stratum scope that gas geology seals up for safekeeping.
Cap rock among the present invention: be the lower rock stratum of permeability in the stratum (be mainly hypotonic rocks such as shale, mud stone, limestone, the relative geology separating layer of transmission coefficient is hanged down 1 more than the order of magnitude).
Concentration among the present invention is volumetric concentration.
The example of engineering calculation explanation:
Natural gas separates and discarded gas is sealed up for safekeeping in the sandstone aquifer that site condition is 800 meters of the degree of depth, 40 meters of thickness, and cap rock is 40 meters thick shale, stratigraphic dip 10 degree, the sandstone pores rate is 20%, each a bite of vertical injection well and drainage well is set, and distance is 5km between the boring
The H that contains 3% volume in the natural gas
2S and 10% carbon dioxide impurities gas, other are 0.80 methane and other hydrocarbon gas such as ethane of 7%, the pressure of impure natural gas mist by 15MPa is injected and be 3MPa at drainage well 20 controlled pressures, the injection rate of injecting well is 7 * 10
6m
3/ day, inject after 8 months and obtained the hydrocarbon gas that separates at drainage well, this project continues 5 years very high hydrocarbon gas of separation purity always, foreign gas appears after the 6th year, and increase in time, concern over time as hydrocarbon gas in the drainage well in Fig. 8 example and foreign gas volume ratio.
Can loss part hydrocarbon gas in the separation process, but relative cost reduces and can ignore this loss, and the total cost of natural gas separation can be controlled in 0.1 yuan/m
3CH
4Below, the spy is (condition of foreign gas＞5%) under the foreign gas concentration condition with higher fully, if the gases at high pressure in the gas field directly separate, total points can be controlled in 0.03 yuan/m from cost
3CH
4Below, because the discarded gas sealed up for safekeeping can make a profit by the Emission Right transaction, this separation and the cost of sealing engineering up for safekeeping are negative value, can make a profit.
Claims (3)
1, a kind of natural gas based on the fluid-mixing self-separation separates and discarded gas geology method of seal, and its feature comprises the following steps:
1. in selected geologic structure, form and inject well (10) and drainage well (20), run through cap rock (41) always and enter geology separating layer (43);
2. will contain the natural gas fluid-mixing of discarding gas by the high pressure injection device and continuously inject geology separating layer (43) by injecting well (10), the foreign gas composition in the natural gas comprises: any mixing of a kind of or two to the eight kinds of gases in carbon dioxide, sulfur dioxide, hydrogen sulfide, sulfur trioxide, nitrous oxide, nitrogen oxide, nitrogen dioxide, the ammonia gas; The volumetric concentration scope of foreign gas is between 0.5%～90%;
3. after natural gas injects, discharge the fluid-mixing of moving to drainage well (20) by drainage well (20);
4. continue to carry out the injection of fluid-mixing and the release of drainage well (20), till the total concentration of methane, ethane, propane low-carbon (LC) hydrocarbon gas is lower than economic concentration value in the fluid that drainage well (20) is discharged, stop whole separation process.
2, the method that a kind of natural gas based on the fluid-mixing self-separation according to claim 1 separates and discarded gas geology is sealed up for safekeeping is characterized in that:
Described geology separating layer (43) is the aquifer, deep, and geology is sealed the place up for safekeeping and comprised an injection well (10) and a drainage well (20) at least.
3, the method that a kind of natural gas based on the fluid-mixing self-separation according to claim 1 separates and discarded gas geology is sealed up for safekeeping, it is characterized in that: the pressure of control drainage well (20) well head, pressure is 0.1MPa～50MPa, does not separate out and is as the criterion to be dissolved in around the drainage well foreign gas in the formation water.
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| US4491179A (en) * | 1982-04-26 | 1985-01-01 | Pirson Sylvain J | Method for oil recovery by in situ exfoliation drive |
| US6089322A (en) * | 1996-12-02 | 2000-07-18 | Kelley & Sons Group International, Inc. | Method and apparatus for increasing fluid recovery from a subterranean formation |
| MY123253A (en) * | 1998-12-31 | 2006-05-31 | Shell Int Research | Method for removing condensables from a natural gas stream |
| CA2543963C (en) * | 2003-11-03 | 2012-09-11 | Exxonmobil Upstream Research Company | Hydrocarbon recovery from impermeable oil shales |
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