CN102434137B - Ultralow interface tension coupling type air-foam oil displacement method - Google Patents
Ultralow interface tension coupling type air-foam oil displacement method Download PDFInfo
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- CN102434137B CN102434137B CN201110423327.6A CN201110423327A CN102434137B CN 102434137 B CN102434137 B CN 102434137B CN 201110423327 A CN201110423327 A CN 201110423327A CN 102434137 B CN102434137 B CN 102434137B
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Abstract
The invention relates to an ultralow interface tension coupling type air-foam oil displacement method. The method comprises the following steps of: mixing air and a foaming agent on the ground, then injecting a mixture into an oil layer to generate air-foam liquid in the oil layer; injecting strong air foam liquid GFPA (Glass-Fiber Reinforced Nylon) in a first step to generate highly strong percolation resistance in a high-percolation water channeling passage so as to force an ultralow interface tension air-foam system ODS ( Oil Displacement System), subsequently injected in a second step, to enter a low-percolation layer, wherein the ODS is defoamed while meeting oil in the low-percolation layer and reduces the percolation resistance, the oil-water interface tension is ultralow, and the oil displacement efficiency is high; and subsequently, alternatively injecting the GFPA and the ODS. The ultralow interface tension coupling type air-foam oil displacement method disclosed by the invention is mainly suitable for increasing the recovery ratio of high-water-content old oil field in the later stage of development.
Description
Technical field
The present invention relates to a kind of flooding method that improves oil recovery factor in tertiary oil recovery technology.
Background technology
Along with the swift and violent development of global economy, the mankind are also increasing to the demand of oil.At present, because exploration engineering has been absorbed in bottleneck, the discovery of new block is more and more difficult, so tertiary oil recovery technology is more and more applied in old filed, ensures the stable yields in oil field with this.In Continental Deposit In China: A Review oil reservoir old filed tertiary oil recovery technology, with fastest developing speed is chemical flooding method, and wherein polymer flooding and combination flooding oil process have been widely applied in the exploitation in each oil field and have obtained good effect.Because polymer flooding and complex oil displacing technology exist the limitation on the two high oil reservoir of complex fault block, scientific research personnel has proposed a kind of new flooding method-air foam displacement of reservoir oil method.
Air foam flooding shaft, as a new technology of tertiary oil recovery, more and more came into one's own in recent years.Air foam system is made up of frother, foam stabilizer and air, not affected by high temperature, high salinity, high-concentration Ca magnesium ion, and source of the gas is abundant, than nitrogen filling foam, active water economy.After air Injection oil reservoir, O
2react with crude oil generation low-temperature oxidation, produce CO
2, water and oxygen containing hydrocarbon compound.What directly play displacement of reservoir oil effect is not air, but the CO generating in oil reservoir, CO
2, N
2flue gas with the composition such as light hydrocarbon component of evaporation interacts with frother in formation pore, because the reasons such as liquid film lags behind, constriction separates, film card is disconnected form foam, foam extruding, occupies with emulsification and can reach oil displacement efficiency.Foam raising with the increase of medium hole depending on viscosity in porous media, the gentle inhibition effect of high viscosity has suppressed stickiness fingering, and dominant flowing path is had to certain plugging action, improves swept volume and oil reservoir energy; Low-temperature oxidation reaction simultaneously consumes oxygen, relies on gas-gravity differentiation effect, has improved the development effectiveness on oil reservoir top.Air foam technology of reservoir sweep is the flooding method in forward position comparatively in current tertiary oil recovery.Form air foam under reservoir condition, can carry out effective shutoff to the crossfire passage of water drive, thereby expand swept volume, reach with this object that improves recovery ratio.
Air foam flooding shaft technology can rely on the effect of expansion swept volume and the effect that flue gas mixed phase drives to involve the remaining oil that water drive is not employed on water drive basis, improves oil recovery factor with this.Although air foam flooding shaft can expand swept volume, because the interfacial tension value of air foam system and crude oil is excessive, general close with oil water interfacial tension, within the scope of 1-30mN/m, the improvement value of oil displacement efficiency is very little, and mechanism of oil displacement is single, conventional air foam is difficult to enter less permeable layer, so the crude oil development degree of low-permeability layer is not high, a large amount of remaining oils are still trapped in less permeable layer and are not displaced, the progress so this technology makes a breakthrough in testing not yet at the scene.
Summary of the invention
The defect existing for overcoming above-mentioned prior art, the technical problem to be solved in the present invention is to provide a kind of ultralow interface tension coupling type air-foam oil displacement method, air and foaming agent solution are mixed and injected on ground, in oil reservoir, produce air foam liquid, utilize two kinds of air foam agent systems of different nature to replace injection, coupling by the two at high less permeable layer generation of interfaces, the strong air foam system GFPA of high oil water interfacial tension enters high permeability zone, meet not froth breaking of oil, efficient shutoff high permeability zone, make follow-up ultralow interfacial tension air foam system ODS enter the less permeable layer (ODS contacts with oil at low-permeability layer) of high oil saturation, ODS meets oily froth breaking performance, at less permeable layer the removal of foam, the ODS liquid of ultralow interfacial tension and air are less at the filtrational resistance of less permeable layer, improve the oil displacement efficiency of less permeable layer, reduce residual oil saturation, significantly improve oil recovery factor.
Ultralow interface tension coupling type air-foam oil displacement method of the present invention, comprises the steps:
Step a. uses reservoir sand to tamp and makes fill out sand tube rock core, and doubly, two high Low Permeable Cores are one group of parallel model to permeability extreme difference 3-4, claims the dry weight saturation water of finding time, and weighs model weight after saturation water, calculates voids volume and degree of porosity; Measure rock core water phase permeability, oily expelling water is set up irreducible water saturation, puts model for subsequent use after 24 hours in insulating box, and core permeability parameter does not meet designing requirement and repeats above-mentioned steps;
Step b. is two-tube rock core access flood pot test flow process in parallel by above-mentioned one group of parallel model, insulating box keeps reservoir temperature, carry out water drive with 5m/d water drive speed, rock core outlet arranges 2MPa back pressure, water drive is to 2PV, moisturely reach 98% and stop water and replace, in displacement process, every 0.1PV records oil mass, liquid measure, pressure, and calculates recovery ratio, moisture content;
After step c water drive finishes, change note ultralow interfacial tension coupling air foam flooding slug, injection mode is that gas-liquid is with note, gas liquid ratio is 1:1, rock core outlet arranges 2MPa back pressure, injecting gas flow is converted under normal pressure and is 20 times of fluid flow, and the displacement velocity that gas-liquid is total and water drive displacement velocity are consistent; First inject strong foaming system GFPA-2 and air, displacement, to 0.5PV, changes note ultralow interfacial tension foam system ODS-1 and air, displacement is to 0.5PV, and then the efficient foaming system GFPA-2 of metaideophone and air, displacement 0.5PV, injects 4PV with this over-over mode accumulative total; In displacement process, every 0.1PV records oil mass, liquid measure, injection pressure, and calculates recovery ratio, moisture content;
Steps d. accumulative total is injected after ultralow interfacial tension coupling air foam flooding slug 4PV, proceeds to follow-up water drive, and water drive speed 5m/d continues to finish experiment after water drive 1PV; In displacement process, every 0.1PV records oil mass, liquid measure, pressure in interval, and calculates moisture content, ultimate recovery.
Air and foaming agent solution mix and are injected into oil reservoir on ground, in oil reservoir, foam, and the foaming agent solution GFPA-2 that described strong blowing agent system is mass concentration 0.4%, frothing percentage 500%, oil water interfacial tension is 10～10
-1the mN/m order of magnitude; The foaming agent solution ODS-1 that described ultralow interfacial tension foam system is mass concentration 0.4%, frothing percentage 400%, oil water interfacial tension is 10
-3the mN/m order of magnitude.
Adopt after such technical scheme, ultralow interface tension coupling type air-foam oil displacement method of the present invention can make the recovery ratio of waterflooding extraction later stage old filed increase substantially.The method has the following advantages:
1. air and foaming agent solution mix and are injected into oil reservoir on ground, in oil reservoir, foam;
2. efficient aerating powder system mainly enters high permeability zone, and frothing percentage reaches 500%, and foam oil resistant stability is strong, and effectively shutoff high permeability zone, increases filtrational resistance, expands swept volume;
3. the frothing percentage of ultralow interfacial tension foaming agent system is more than 400%, and oil water interfacial tension reaches 10
-3the mN/m order of magnitude, after the efficient foaming system shutoff that this system is injected in earlier stage at high permeability zone, mainly enter the less permeable layer that oil saturation is higher, this system is froth breaking after less permeable layer is met oil, reduce the filtrational resistance of foam, produce ultralow oil water interfacial tension simultaneously, residual oil is flowed, improve oil displacement efficiency;
4. alternately inject two kinds of air foam systems, (efficiently) blowing agent system shutoff high permeability zone by force, expand swept volume, ultralow interfacial tension foaming agent system enters less permeable layer after efficient aerating powder system shutoff high permeability zone, reduce oil water interfacial tension, displacement residual oil, improve oil displacement efficiency, the two constantly alternately injects, high and low permeable formation intermediate zone at oil reservoir forms coupling, make air foam constantly enter high permeability zone, ultralow interfacial tension blowing agent constantly enters less permeable layer, realize and increase substantially oil recovery factor.
Brief description of the drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail:
Fig. 1 is limit water drive oil resultant curve;
Fig. 2 is air oil drive resultant curve;
Fig. 3 is pure blowing agent displacement of reservoir oil resultant curve;
Fig. 4 is conventional air foam displacement of reservoir oil resultant curve;
Fig. 5 is ultralow interface tension coupling type air-foam oil displacement resultant curve.
Detailed description of the invention
Following examples are respectively that limit water drive, blowing agent drive, air drives, conventional air foam flooding shaft and ultralow interfacial tension coupling air foam flooding.In example, artificial core parameter list used is in table 1.Experimental temperature is decided to be 65 DEG C with reference to Dagang Oilfield Gangdong two district's five fault block oil reservoir conditions, and preparation water is Gangdong two district's five fault block stratum injected waters.
Efficiently (by force) blowing agent system is the foaming agent solution GFPA-2 of mass concentration 0.4%, frothing percentage 500%, and oil water interfacial tension is 10
-1mN/m;
Ultralow interfacial tension foam system is the foaming agent solution ODS-1 of mass concentration 0.4%, frothing percentage 400%, and oil water interfacial tension is 10
-3mN/m.
The admission of experimental data
1) pressure recording
In displacement process, carry out the admission of an injection pressure value at interval of 0.05PV, finally use excel to draw injection pressure curvilinear motion situation;
2) profit data recording
In displacement process, carry out the metering of oil mass and liquid measure at interval of 0.05PV, calculate relevant parameters such as injecting PV number, moisture content, recovery ratio simultaneously, finally use excel to draw displacement of reservoir oil resultant curve.
Table 1 example rock core oil displacement experiment parameter list
Embodiment 1: the two-tube core experiment in parallel of limit water drive
By one group of two-tube rock core in parallel (saturated oils) access flood pot test flow process (constant temperature under reservoir temperature), with water drive speed, 5m/d carries out flood pot test, water drive is (moisture 98%) to 2PV, continue water drive 5PV, until outlet finishes experiment when no longer fuel-displaced, in displacement process, every 0.1PV records at interval change value of pressure, moisture content and recovery percent of reserves situation of change, calculate ultimate recovery, refer to accompanying drawing 1.
Embodiment 2: air drives two-tube core experiment in parallel
By one group of two-tube rock core access flood pot test flow process in parallel (constant temperature under reservoir temperature), with water drive speed, 5m/d carries out water drive, water drive is (moisture 98%) to 2PV, metaideophone air (with the volume under air flow meter control injection pressure condition) 4PV, follow-up water drive 1PV finishes experiment; In displacement process, the displacement velocity of air and water drive displacement velocity are consistent, and every 0.1PV records at interval change value of pressure, moisture content and recovery percent of reserves situation of change, calculate ultimate recovery, refer to accompanying drawing 2.
Embodiment 3: pure blowing agent (surfactant) drives two-tube core experiment in parallel
By one group of two-tube rock core access flood pot test flow process in parallel (constant temperature under reservoir temperature), with water drive speed, 5m/d carries out water drive, water drive is to 2PV(moisture 98%) after, change the surfactant solution displacement 4PV of on-the-spot waste water into, follow-up water drive 1PV finishes experiment; In displacement process, the displacement velocity of air and water drive displacement velocity are consistent, and every 0.1PV records at interval change value of pressure, moisture content and recovery percent of reserves situation of change, calculate ultimate recovery, refer to accompanying drawing 3.
Embodiment 4: the two-tube experiment in parallel of air foam flooding shaft
By one group of two-tube rock core access flood pot test flow process in parallel (constant temperature under reservoir temperature), with water drive speed, 5m/d carries out water drive, and water drive is to 2PV(moisture 98%) after, change air foam displacement 4PV into, follow-up water drive 1PV finishes experiment; In displacement process, maintenance gas liquid ratio is 1:1, and the displacement velocity that gas-liquid two-phase is total and water drive displacement velocity are consistent, and every 0.1PV records at interval change value of pressure, moisture content and recovery percent of reserves situation of change, calculates ultimate recovery, refers to accompanying drawing 4.
Embodiment 5: the two-tube experiment in parallel of ultralow interfacial tension coupling air foam flooding
By one group of two-tube rock core access flood pot test flow process in parallel (constant temperature under reservoir temperature), with water drive speed, 5m/d carries out water drive, water drive is to 2PV(moisture 98%) after, change ultralow interfacial tension coupling air foam flooding into for 4PV, follow-up water drive 1PV finishes experiment; In displacement process, maintenance gas liquid ratio is 1:1, the displacement velocity that gas-liquid is total and water drive displacement velocity are consistent, first use efficient foaming system GFPA-2 to carry out displacement, displacement is carried out displacement to changing ultralow interfacial tension air foam system ODS-1 into after 0.5PV, and displacement again transfers efficient foaming system GFPA-2 to 0.5PV, alternately injects 4PV with which, record change value of pressure, moisture content and recovery percent of reserves situation of change in process at interval of 0.1PV, refer to accompanying drawing 5.
Comprehensive Correlation by above 5 examples can be found out, " the ultralow interfacial tension coupling air foam flooding " that uses ultralow interfacial tension air foam system and efficient foaming air foam system alternately to inject, improve recovery ratio amplitude maximum, on water drive basis, can improve 22.8%, improve 4.1% than conventional air foam flooding shaft.Illustrate and use that to re-use the displacement of reservoir oil of ultralow interfacial tension air foam system after efficient foaming system shutoff be a kind of displacement new method that can increase substantially oil recovery factor, be suitable for moisture 98% the waterflooding extraction later stage old filed that reaches, there is comparatively wide application prospect.
Claims (2)
1. a ultralow interface tension coupling type air-foam oil displacement method, comprises the steps:
Step a. uses reservoir sand to tamp and makes fill out sand tube rock core, and doubly, two high Low Permeable Cores are one group of parallel model to permeability extreme difference 3-4, claims the dry weight saturation water of finding time, and weighs model weight after saturation water, calculates voids volume and degree of porosity; Measure rock core water phase permeability, oily expelling water is set up irreducible water saturation, puts model for subsequent use after 24 hours in insulating box, and core permeability parameter does not meet designing requirement and repeats above-mentioned steps;
Step b. is two-tube rock core access flood pot test flow process in parallel by above-mentioned one group of parallel model, insulating box keeps reservoir temperature, carry out water drive with 5m/d water drive speed, rock core outlet arranges 2MPa back pressure, water drive is to 2PV, moisturely reach 98% and stop water and replace, in displacement process, every 0.1PV records oil mass, liquid measure, pressure, and calculates recovery ratio, moisture content;
After step c water drive finishes, change note ultralow interfacial tension coupling air foam flooding slug, injection mode is that gas-liquid is with note, gas liquid ratio is 1:1, rock core outlet arranges 2MPa back pressure, injecting gas flow is converted under normal pressure and is 20 times of fluid flow, and the displacement velocity that gas-liquid is total and water drive displacement velocity are consistent; First inject strong foaming system GFPA-2 and air, displacement, to 0.5PV, changes note ultralow interfacial tension foam system ODS-1 and air, displacement is to 0.5PV, and then the efficient foaming system GFPA-2 of metaideophone and air, displacement 0.5PV, injects 4PV with this over-over mode accumulative total; In displacement process, every 0.1PV records oil mass, liquid measure, injection pressure, and calculates recovery ratio, moisture content;
Steps d. accumulative total is injected after ultralow interfacial tension coupling air foam flooding slug 4PV, proceeds to follow-up water drive, and water drive speed 5m/d continues to finish experiment after water drive 1PV; In displacement process, every 0.1PV records oil mass, liquid measure, pressure in interval, and calculates moisture content, ultimate recovery.
2. ultralow interface tension coupling type air-foam oil displacement method according to claim 1, it is characterized in that: air and foaming agent solution mix and are injected into oil reservoir on ground, in oil reservoir, foam, the foaming agent solution GFPA-2 that described strong blowing agent system is mass concentration 0.4%, frothing percentage 500%, oil water interfacial tension is 10～10
-1the mN/m order of magnitude; The foaming agent solution ODS-1 that described ultralow interfacial tension foam system is mass concentration 0.4%, frothing percentage 400%, oil water interfacial tension is 10
-3the mN/m order of magnitude.
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| CN102980828B (en) * | 2012-08-27 | 2015-07-15 | 中国石油大学(华东) | Apparatus and method for measuring gas phase saturation degree of single tube core during foam flooding process |
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| CN108229051B (en) * | 2018-01-18 | 2021-05-11 | 陕西延长石油(集团)有限责任公司研究院 | Method for predicting recovery ratio of air foam flooding of oil reservoir |
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