CN101775971A - Oil field maximum swept volume chemical flooding oil extraction method - Google Patents
Oil field maximum swept volume chemical flooding oil extraction method Download PDFInfo
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Abstract
A maximum swept volume chemical flooding oil extraction method is applied to the technical field of oil field oil extraction. The suitable oil reservoirs are all oil reservoirs which can be developed by water drive but not developed by water drive. During oil exploitation, the self energy of the oil reservoir stratum is utilized to perform self-injection oil production or swabbing oil extraction, when the oil field of the self-injection oil production or swabbing oil extraction reaches the exploitation economic benefit limit, the self-injection oil production or swabbing oil extraction is finished, the water-flooding oil extraction is not performed, and the chemical flooding injected with the surfactant as the main agent is directly adopted to perform the enhanced oil extraction. The effect is as follows: at the moment, the swept volume of the displacement of the chemical displacement fluid is the largest, which is most beneficial to exerting the oil washing effect of the surfactant, thereby maximizing the petroleum recovery ratio.
Description
Technical field
The present invention relates to oil recovery technique field, oil field, be particularly related to a kind of oil field development method, but be a kind of oil reservoir that is applicable to the water drive exploitation and does not carry out the water drive exploitation, when maximum swept volume, inject the surfactant that improves displacement efficiency and make the maximized oil field development method of oil recovery.
Background technology
At present, the oil production method order that conventional oil field development is continued to use utilized the reservoir formation self-energy to carry out oil flow production or swabbing production before this, and system often is called primary oil recovery; Inject water makeup energy and displacement crude oil from injecting well after the oil reservoir energy attenuation, carry out the producing well pumping simultaneously and produce, system often is called secondary oil recovery; Secondary oil recovery still has later 55～70% crude oil to be detained underground, palpus adopts polymer-thickened or gel profile-controlling improves chemical agent intensified oil reduction measures such as intake profile and surfactant reduction oil water interfacial tension raising displacement efficiency to improve oil recovery, and uniting often is called tertiary oil recovery.
Primary oil recovery described here is to utilize natural energy to recover the oil, and with natural energy depletion, oil well does not go out or production capacity changes the exploitation of secondary water drive over to when very low and recovers the oil.
Secondary oil recovery described here is that water drive is developed oil recovery, promptly injects the additional or increase oil reservoir energy of water from injecting well, and crude oil drives along the injection well and sweeps to producing well, produces from the producing well oil pumping.Reach 95% or during higher economic limit when producing well extraction liquid is moisture, change tertiary oil recovery over to;
Tertiary oil recovery described here is meant the intensified oil reduction method of any one or two kinds of combinations or three kinds of combinations of injecting surfactant, alkali, polymer three class chemical agents.In order to reduce fingering phenomenon that oil/water mobility ratio reduces displacement water, to enlarge swept volume and improve intake profile, add high molecular polymer usually, as polyacrylamide etc. to improve the viscosity of displacing fluid; In order to improve displacement efficiency, add surfactant usually to reduce interfacial tension, improve wetability and to strengthen emulsifiability; For the oil recovery effect of synergistic surfactant, add the alkali synergistic surfactant usually and reduce interfacial tension to greatest extent to improve displacement efficiency.The common comparable water drive of surfactant-alkali-polymer ternary combination flooding improves the oil recovery of about 20%OOIP (accounting for the oil recovery percentage of original oil in place), its conventional working concentration is respectively surfactant 0.2%～0.4% (w/w), alkali 1.0%～1.6% (w/w), polymer 0.1%～0.25 (w/w), injection rate 0.5～0.8PV (reservoir pore volume), concentration height, consumption are big, cost is very high.
Existing suitable water drive is carried out the oil field of secondary oil recovery exploitation, and its development sequence all is through primary oil recovery, secondary oil recovery, enters tertiary oil recovery at last.The shortcoming of this development sequence is:
1, water drive washes away the strong suction layer that leaks
After sandstone recovered the oil through long-period water drive, washing thickness was more and more thinner, until relative strong water accepting layer occurring, cause " poor efficiency is invalid " circulation of water-drive oil recovery at last.No matter the permeability of oil reservoir height, the difference that layer is interior or interlayer deposits of certain core intersection relative strong water accepting layer and " poor efficiency is invalid " circulating phenomenon all can occur after a large amount of water bodys wash away, the big problem of oil reservoir appearance " leaking " after promptly water drive finishes.Usually the recovery ratio of water-drive oil recovery is 30～45%OOIP (accounting for the percentage of original crude content), and most of crude oil also remains in underground behind the water-drive oil recovery.
After 90 years last century, Daqing oil field has newly been beaten a collection of sealed coring well, and data shows: along with the passing of waterflooding extraction process, and relative homogeneous on average about 1000 * 10
-3μ m
2Reservoir physical property great changes have taken place, cause permeability grade to become big, high infiltration section thickness occupies certain ratio (seeing Table 1).
The thickness that high infiltration section occurs after table 1 water drive
| New well-digging number | Greater than 3000 * 10 -3μm 2 | Greater than 5000 * 10 -3μm 2 | |
| Oil extraction No.1 Factory | ??12 | ??19.3％ | |
| Three factories of recovering the oil | ??3 | ??10.2％ | ??3.9％ |
| Six factories of recovering the oil | ??3 | ??20.7％ | ??6.5％ |
Survey intake profile result (consulting table 2) from the Daqing oil field six factories isotopes that recover the oil, along with the passing of water injection time, water sucting thickness and swept volume alter a great deal in the layer, inject water and advance by leaps and bounds along the high infiltration of macropore position at last, form " invalid and poor efficiency " circulation.The grand celebration three monolayer assay district P of factory that recover the oil
I1-3When layer is surveyed production profile after well water 95%, find that the thickness of oil reservoir bottom 1/3rd accounts for 80% of holostrome production fluid amount.
Water sucting thickness changes after table 2 water drive
| Initial stage of development | At present | |
| Water sucting thickness in the layer | ??99.9％ | ??87.79％ |
| Main water absorbing section thickness proportion | ??75.63％ | ??33.08％ |
2, chemical agent intensified oil reduction
Water-drive oil recovery finishes the chemical flooding intensified oil reduction implemented the back in fact for administering that water-drive oil recovery causes " leaking " problem and in conjunction with the raising recovery ratio method of washing oil.Enlarge swept volume in order to control water breakthrough, tertiary oil recovery often adopts gel and polymer solution to adjust intake profile (polymer displacement of reservoir oil is applied in China) on a large scale, but the effect of this profile control is not very desirable, only adjusts in the plane usually as polymer flooding to enlarge swept volume.Ternary composite driving reduces tackifying and the viscoplasticity that interfacial tension, alkali have a strong impact on polymer and makes profile control effect it would be better polymer flooding owing to adding the alkali synergistic surfactant.As in the Daqing oil field Portugal
I1-4In the strata compound oil displacement process, find that polymer produced quantity in oil well is very big, implantation concentration 1000mg/L, and extraction concentration is up to 600-800mg/L, the appearance of this phenomenon is exactly that the oil reservoir vertical heterogeneity causes polymer solution to be advanced by leaps and bounds greatly, greatly reduces polymer in the poly-rate of depositing of oil reservoir.Also there is similar problem in the five factory polymer displacement of reservoir oil industrial test districts of recovering the oil, cause the poly-effect that improves recovery ratio of driving to descend significantly.The ternary composite driving industrialization field test in four factory's apricots two that recovers the oil, test result shows: P
I33Layer unit thickness accumulative total is injected multiple and is equivalent to P
I21P
I22P
I23The layer two times, cause ternary system can not give full play to the effect of ultralow interfacial tension washing oil at each substratum, had a strong impact on the development effectiveness of ternary composite driving.And the ternary composite driving of polymer flooding or alkali+polymer+surfactant, the cost of chemical treatments is much larger than injecting the water cost, and the leakage of this chemical agent solution scurries that invalid circulation makes loss bigger with poor efficiency!
Have method to control or delay the appearance of strong water accepting layer and prolong anhydrous period exploitation or improve oil recovery by a larger margin? does administering later appear in the layer that leaks that must wait until strong suction why again? does surfactant with strong washing oil function appear adding later in the layer that leaks that must wait until strong suction why again?
Summary of the invention
The purpose of this invention is to provide a kind of oil field maximum swept volume chemical flooding oil recovery new method, change oil field development and need pass through primary oil recovery, secondary oil recovery in proper order, enter the conventional method of tertiary oil recovery at last, on the opportunity of the most suitable injection chemical agent---inject surfactant when being maximum swept volume or add a little auxiliary again and carry out intensified oil reduction, improve oil recovery to improve displacement efficiency and then amplitude peak ground, reduce chemical agent use kind and consumption, significantly reduce cost for oil production, shorten the oil extraction time greatly, many extraction oil to greatest extent; Most of crude oil also remains in underground deficiency after overcoming existing oil field development method water-drive oil recovery; Overcome that the water drive development time is long in the existing oil field development procedure, efficient is low, cause the water breakthrough major path to make very deficiency such as difficulty of follow-up oil recovery.
The technical solution used in the present invention is: oil field maximum swept volume chemical flooding oil production method is characterized in that:
When the oil oil reservoir is exploited, at first utilize the reservoir formation self-energy to carry out oil flow production production or swabbing production (tradition is called primary oil recovery), when the oil field of oil flow production production or swabbing production reaches the economic benefit maximum conditions, finish oil flow production production or swabbing production, but directly adopt the displacing fluid that injects surfactant or interpolation a little auxiliary to carry out intensified oil reduction, (tradition is called tertiary oil recovery), do not carry out conventional water drive exploitation and recover the oil, promptly do not carry out the secondary oil recovery that traditional oil recovery program is implemented.When finishing oil flow production production or swabbing production, the swept volume maximum of chemical agent displacing fluid displacement helps bringing into play the washing oil effect of surfactant, improves the oil recovery maximization thereby make.
It is possess following two kinds of situations a kind of that oil reservoir reaches the oil recovery condition of injecting surfactant or adding the displacing fluid of a little auxiliary again: 1. oil flow production be can not produce oil or oil pump capacity reaches the economic benefit limit, 2. the oil production of swabbing production reaches the economic benefit limit, just should in time adopt oil field of the present invention maximum swept volume chemical flooding oil production method.
The surfactant of described injection or add a little auxiliary again and comprise: possess emulsifiability (Water-In-Oil or oil-in-water emulsification) surfactant, can form low by (10 with the oil reservoir profit
-1～10
-2MN/m) or ultralow (＜10
-2MN/m) surfactant of interfacial tension, the oil reservoir wetability wet can be turned to the surfactant of neutrality or water-wet or possesses composite between the surfactant of above-mentioned oil recovery performance from glossy, and with collaborative high molecular polymer and the alkali that recovers the oil of surfactant
The described surfactant that possesses emulsifiability is:
NPE
OPEO
The described surfactant that can form low or ultralow interfacial tension with the oil reservoir profit is:
Petroleum sulfonate
Betaine
Describedly can wet turn to the surfactant of neutrality or water-wet to be from glossy the oil reservoir wetability:
Betaine
Described different mining oiliness can the surfactant compound agent, each weight percentages of components be:
Betaine: 60～80% (w/w)
NPE: 15～30% (w/w)
Petroleum sulfonate: 5～10% (w/w)
Each component sum is absolutely.
Described synergistic surfactant recover the oil auxiliary agent---high molecular polymer and alkali comprise:
A, highly basic are NaOH, KOH etc.;
B, weak base are Na
2CO
3, NaHCO
3, Na
3PO
4Deng;
C, high molecular polymer are polyacrylamide, xanthans etc.
Described surfactant, high molecular polymer, the collaborative use of alkali, the concentration of use is:
The surfactant working concentration: 0.05%～1.0% (w/w), the solvent of employing is a water.
The polymer working concentration: 0.01%～1.0% (w/w), the solvent of employing is a water.
The alkali working concentration: 0.01%～2.0% (w/w), the solvent of employing is a water.
Water-drive oil recovery is washed core intersection and swept volume maximum in earlier stage, and water-drive oil recovery adds surfactant in earlier stage can bring into play its reduction residual oil saturation, the effect that improves displacement efficiency to greatest extent.The surfactant of function admirable can reduce oil water interfacial tension to 10
-3MN/m or following ultra low levels, residual oil saturation can be reduced to about 10%OOIP.
The oil recovery of oil field maximum swept volume chemical flooding oil production method is greater than the recovery ratio of water drive+subsequent chemistry combination flooding sum! Oil production, cost for oil production and the equal optimization of exploitation timeliness.Particularly hypotonic and special LOW PERMEABILITY RESERVOIR, the polymer flooding after the water drive is difficult to carry out, and it is the most favourable to use oil field maximum swept volume chemical flooding oil production method.
The reason of oil field maximum swept volume chemical flooding oil production method is:
(1), get involved surfactant before the water-drive oil recovery, also do not exist this moment strong water accepting layer, surfactant and crude oil can interact fully to reduce interfacial tension raising displacement efficiency.And after water drive causes strong water accepting layer, get involved again, surfactant very easily " is missed " along strong water accepting layer.In the last few years, often there is the tertiary oil recovery combination flooding to increase the discussion of the single chemical agent contribution of oil, is the effect of polymer just greatly or the effect of surfactant is big? experimental results show that, the polymer viscosified profile control is prerequisite and the necessary condition that improves recovery ratio, and surfactant is the adequate condition that increases substantially oil recovery.Have only polymer or gel to adjust intake profile relief surfactant and enter high crude oil saturation ratio zone its washing oil effect of competence exertion.According to the surfactant flooding that maximum swept volume chemical flooding oil production method is implemented, its recovery ratio is greater than the recovery ratio of water drive+subsequent chemistry combination flooding.
(2), the effect of surfactant is various, improves the displacement efficiency except ultralow interfacial tension reduces residual oil saturation, also has oil-in-water or invert emulsion, solubilising, foaming, transformation wetability etc. to increase the oil effect.As oil-water emulsifiers, can reduce viscosity of crude and improve its flowability.The invert emulsion of appropriateness (mainly being used in the surfactant flooding slug in earlier stage) obviously improves the viscosity of fluid, can play good profile control effect.
(3), adopt maximum swept volume chemical flooding oil production method, surfactant fully contacts with crude oil, the water-in-oil emulsion of formation and oily wall are controlled fluid front and are evenly advanced.Pile up at layer position water-in-oil emulsion and crude oil that relative permeability is big, flow resistance is bigger, therefore has the fingering phenomenon that occurs easily when automatic profile control is avoided water drive.The oil recovery of swept volume maximum, displacement efficiency height, once maximum swept volume chemical flooding oil production method operation drives two subjob sums greater than water drive+subsequent chemistry.Experiment shows: by the surfactant flooding that maximum swept volume chemical flooding oil production method is implemented, its anhydrous period oil recovery shows that also much larger than (more than the high 20%OOIP) of water drive water body fingering phenomenon is less, and oily wall is evenly pushed ahead.
Beneficial effect of the present invention: the oil field of the present invention obvious advantage of maximum swept volume chemical flooding oil production method has: few water injection rate and sewage load, exempt from polymer and alkali, the operational period of lacking, high recovery ratio, above cost is at half.
(1), drive the surfactant that adds strong washing oil when sweeping swept volume, make the recovery ratio maximization, one-time surface surfactant flooding recovery ratio is greater than the recovery ratio of water drive+20% in maximum;
(2), be less than 0.7PV (surfactant solution drives+follow-up water drive) but total injection rate extraction 60%OOIP crude oil;
(3), with conventional first water drive subsequent chemistry flooding tertiary oil recovery again, the chemical agent component reduces to for three kinds from surfactant+alkali+polymer has only surfactant a kind of;
The consumption of surfactant when (4), the dosage of surfactant of the maximum swept volume chemical flooding in oil field oil production method approximates ternary composite driving;
(5), the oil recovery integrated cost reduces more than 50%;
(6), the oil producing operation time can reduce more than 2/3rds;
(7), environmental benefit is obvious, uses the little pollution of chemical dose little, do not damage oil reservoir, extraction liquid treating capacity reduces greatly and processing method is simplified;
(8) but, this method is applicable to water drive exploitation and do not carry out that (or the water drive time is not long, moisture not high, the water breakthrough layer does not also appear) all oil reservoirs of water drive exploitation, no matter be that special hypotonic (surfactant has the augmented injection function) or high oil impregnate are hidden, the serious heterogeneity oil reservoir can be transferred stifled the solution by the invert emulsion ability or the ventilation formation foam of adjustment form surface-active agent.
Description of drawings
Fig. 1 is 0.2% concentration surfactant solution oil displacement efficiency schematic diagram.
Fig. 2 is 0.3% concentration surfactant solution oil displacement efficiency schematic diagram.
Fig. 3 is 0.4% concentration surfactant solution oil displacement efficiency schematic diagram.
Fig. 4 is 0.4% concentration surfactant solution 0.5PV slug oil displacement efficiency schematic diagram.
Fig. 5 is pure oilfield injection water oil displacement efficiency schematic diagram.
The specific embodiment
Embodiment 1: with the natural core in long celebrating oil field, adopt length to celebrate reservoir conditions such as the crude oil in oil field, formation water, temperature, crude oil saturation ratio and use maximum swept volume chemical flooding oil production method, carrying out the indoor physical simulation oil displacement test is example, and invention is described in further detail.
A, long celebrating oil field development time are not long, and many newly-increased oils in place are arranged every year, and new producing well and the block of beating newly developed, the maximum swept volume chemical flooding of the very suitable utilization of new block oil production method.These new block are the lower sandstone of permeability, all can carry out the water drive exploitation and still also not implement the water drive exploitation.At first utilize the reservoir formation self-energy to carry out swabbing production, when the oil field of swabbing production reaches the exploitation economic limit, finish swabbing production, directly adopt the injection surfactant to carry out intensified oil reduction.
B, indoor physical simulation oil displacement test: the natural core of in core holding unit, packing into, under the reservoir temperature of long celebrating oil field, add and vacuumize the saturated formation water in back after ring is pressed, long celebrating ground, the oil field dehydration well head crude oil that reinjects is saturated until crude oil.Standby after the aging week.
C, carry out the comparative test of maximum swept volume chemical flooding oil production method and conventional water drive secondary development at the long celebrating of lab simulation oil field reservoir condition.The water drive imitation oil displacement experiment that carries out that the water drive blank compares is tested; Adopt the water drive of not carrying out of maximum swept volume chemical flooding oil production method directly to implement chemical flooding.
The surfactant that this test is injected is petroleum sulfonate, NPE and the betaine compound system that can form low interfacial tension or ultralow interfacial tension with the trial zone profit.
The weight ratio of the surfactant compound prescription of petroleum sulfonate, NPE and betaine is:
Betaine: 70% (w/w)
NPE: 23% (w/w)
Petroleum sulfonate: 7% (w/w)
Being mixed with surfactant concentration during actual the use is respectively 0.2%, 0.3% and 0.4% aqueous surfactant solution and carries out the indoor physical simulation oil displacement experiment.
D, employing natural core, ground dehydration well head crude oil and oil field stratum water, under reservoir temperature, carry out the contrast test of the maximum swept volume chemical flooding oil production method that the blank contrast test of a water drive and 4 surfactant water flooding solution drives, detailedly the results are shown in Table 3.Blank water drive oil recovery 42.11%OOIP, anhydrous period oil recovery 32.16%OOIP (see figure 5).The aqueous surfactant solution of variable concentrations drives maximum swept volume chemical flooding oil production method, surfactant concentration is respectively 0.2%, 0.3% and 0.4% oil recovery is respectively the 64.81%OOIP (see figure 1), 69.68%OOIP (see figure 2) and 74.34%OOIP (see figure 3), improve recovery ratio 22.7～32.33%OOIP than blank water drive, the anhydrous period recovery ratio is respectively the 52.46%OOIP (see figure 1), 54.83%OOIP (see figure 2) and 55.92%OOIP (see figure 3), improve recovery ratio 20.3～23.76%OOIP during than blank water drive, it is slow to show that the water body fingering breaks through, the even forward impelling of oily wall.The displacement (see figure 4) of the aqueous solution 0.5PV slug of 0.4% surfactant concentration, recovery ratio is 73.08%OOIP, improve recovery ratio 30.97%OOIP than blank water drive, the anhydrous period recovery ratio is 52.56%OOIP, improves recovery ratio 20.4%OOIP during than blank water drive.Shown all that below direct aqueous surfactant solution with low concentration drives maximum swept volume chemical flooding oil production method, its recovery ratio is higher than water drive 22.7～32.33%OOIP.
Calculate if improve recovery ratio 20%OOIP according to alkaline surfactant polymer flooding oil-field after the present water drive (method of raising oil recovery maximum in the tertiary oil recovery---the about 20%OOIP of ternary composite driving raising oil recovery), the recovery ratio that adopts the one-stop operation of maximum swept volume chemical flooding oil production method is greater than both sums of water drive+tertiary oil recovery (ternary composite driving)! And that the chemical agent component reduces to surfactant from three kinds of alkali, surfactant and polymers is a kind of, the dosage of surfactant that maximum swept volume chemical flooding method is used approximates the surface active agent composition consumption of ternary composite driving, and operating cost, oil production, chemical agent consumption, operation duration, the post processing of extraction liquid are all optimized greatly.
Table 3 oil displacement test rock core parameter and recovery ratio
| The rock core numbering | Apricot 56-18 (1-61/1 20) | Apricot 56-18 (1-55/12 0-3) | Apricot 56-18 (1-79/1 20) | Apricot 56-18 (2-13/70-1) | The 3-10 town |
| The crude oil place of production | Long celebrating-the village | Long celebrating-the village | Long celebrating-the village | Long celebrating-the village | Long celebrating-the village |
| Drill core permeability rate | ??0.372 | ??0.194 | ??0.432 | ??0.268 | ??0.278 |
| Degree of porosity % | ??11.40 | ??10.7 | ??10.50 | ??9.80 | ??12.20 |
| Rock density g/cm 3 | ??2.35 | ??2.37 | ??2.37 | ??2.39 | ??2.35 |
| Core quality g | ??61.64 | ??62.48 | ??61.47 | ??62.61 | ??58.973 |
| Core length cm | ??5.3 | ??5.3 | ??5.3 | ??5.3 | ??5 |
| Core diameter cm | ??2.42 | ??2.42 | ??2.42 | ??2.42 | ??2.42 |
| The rock core numbering | Apricot 56-18 (1-61/1 20) | Apricot 56-18 (1-55/12 0-3) | Apricot 56-18 (1-79/1 20) | Apricot 56-18 (2-13/70-1) | The 3-10 town |
| The displacement scheme | 0.2% surfactant | 0.3% surfactant | 0.4% surfactant | 0.4% surfactant 0.5PV | Water drive |
| Displacement temperature ℃ | ??65 | ??65 | ??65 | ??65 | ??65 |
| The highest displacement pressure MPa | ??7.26 | ??7.32 | ??6.78 | ??6.91 | ??7.05 |
| Voids volume cm 3 | ??2.65 | ??2.585 | ??2.586 | ??2.437 | ??2.7 |
| Saturated oils volume cm 3 | ??1.62 | ??1.55 | ??1.52 | ??1.56 | ??1.71 |
| The oil saturation ratio | ??61.13％ | ??59.96％ | ??58.78％ | ??64.01％ | ??63.33％ |
| Oil recovery volume cm 3 | ??1.05 | ??1.08 | ??1.13 | ??1.14 | ??0.72 |
| Recovery ratio % anhydrous period recovery ratio % | ??64.81??52.46 | ??69.68??54.83 | ??74.34??55.92 | ??73.08??52.56 | ??42.11??32.16 |
Displacement equipment: XS-50 type HTHP rock core displacement device.
The variable concentrations surfactant solution drives with blank water drive result and sees Fig. 1～Fig. 5 for details, improves 22%～32%OOIP than water drive, and oil increasing effect is fine.
Embodiment 2: the initial stage of production of certain oil oil reservoir, utilize the reservoir formation self-energy to carry out oil flow production production,, finish oil flow production production when oil is can not produce in oil flow production, do not carry out conventional water-drive oil recovery, but directly adopt the displacement of injection surfactant solution to carry out intensified oil reduction.
The surfactant of the injection of being adopted is: possessing the surfactant of emulsifiability (Water-In-Oil or oil-in-water emulsification), specifically is NPE.The working concentration of NPE is 0.2% (w/w), and the solvent of employing is a water.
Embodiment 3: when certain oil oil reservoir exploitation, at first utilize the reservoir formation self-energy to carry out swabbing production, when the oil field of swabbing production reaches the exploitation economic benefit limit, promptly put into production cost near or when equaling the output cost, finish swabbing production, do not carry out conventional water-drive oil recovery, but the displacing fluid that directly adopts the injection surfactant to add a little auxiliary again carries out intensified oil reduction.
The displacing fluid that the injection surfactant that is adopted adds a little auxiliary again is: the surfactant compound of two kinds of different mining oiliness energy adds small amount of alkali again, and each weight percentages of components is:
Betaine: 86% (w/w)
Petroleum sulfonate: 12% (w/w)
Alkali---sodium carbonate: 2% (w/w)
During use, the surfactant compound of two kinds of different mining oiliness energy adds the working concentration of small amount of alkali again: 0.35% (w/w), the solvent of employing is a water.
Embodiment 4: the initial stage of production of certain oil oil reservoir, utilize the reservoir formation self-energy to carry out oil flow production production,, finish oil flow production production when oil is can not produce in oil flow production, do not carry out conventional water-drive oil recovery, but directly adopt the displacement of injection surfactant solution to carry out intensified oil reduction.
The surfactant of the injection of being adopted is: can be with the oil reservoir wetability from the glossy wet surfactant betaine that turns to neutrality or water-wet.The working concentration of betaine is 0.3% (w/w), and the solvent of employing is a water.
Claims (9)
1. the maximum swept volume chemical flooding in oil field oil production method, it is characterized in that: when the oil oil reservoir is exploited, at first utilize the reservoir formation self-energy to carry out oil flow production production or swabbing production, when the oil field of oil flow production production or swabbing production reaches the exploitation economic benefit limit, finish oil flow production production or swabbing production, no longer then, carry out conventional water-drive oil recovery, but directly adopt the displacing fluid that injects surfactant or interpolation a little auxiliary to carry out intensified oil reduction, the swept volume maximum of surfactant solution displacement this moment, help most bringing into play the washing oil effect of surfactant, improve the oil recovery maximization thereby make.
2. want 1 described oil field maximum swept volume chemical flooding oil production method as right, it is characterized in that: it is possess following two kinds of situations a kind of that described oil reservoir reaches the oil recovery condition of injecting surfactant or adding the displacing fluid of a little auxiliary again: 1. oil flow production be can not produce oil or oil pump capacity reaches the economic benefit limit, 2. the oil production of swabbing production reaches the economic benefit limit, just should in time adopt oil field of the present invention maximum swept volume chemical flooding oil production method.
3. oil field as claimed in claim 2 maximum swept volume chemical flooding oil production method is characterized in that: the surfactant of described injection or add a little auxiliary again and comprise: possess emulsifiability (Water-In-Oil or oil-in-water emulsification) surfactant, can form low by (10 with the oil reservoir profit
-1～10
-2MN/m) or ultralow (＜10
-2MN/m) surfactant of interfacial tension, the oil reservoir wetability wet can be turned to the surfactant of neutrality or water-wet or possesses composite between the surfactant of above-mentioned oil recovery performance from glossy
The auxiliary agent that synergistic surfactant recovers the oil comprises high molecular polymer and alkali.
4. oil field as claimed in claim 3 maximum swept volume chemical flooding oil production method, it is characterized in that: the surfactant that possesses emulsifiability is a NPE, or OPEO.
5. oil field as claimed in claim 3 maximum swept volume chemical flooding oil production method is characterized in that: the surfactant that can form low or ultralow interfacial tension with the oil reservoir profit is a petroleum sulfonate, or betaine.
6. oil field as claimed in claim 3 maximum swept volume chemical flooding oil production method is characterized in that: can wet to turn to the surfactant of neutrality or water-wet be betaine from glossy with the oil reservoir wetability.
7. oil field as claimed in claim 3 maximum swept volume chemical flooding oil production method, it is characterized in that: each weight percentages of components of the surfactant compound of oil recovery performance is:
Betaine: 60～80% (w/w);
NPE: 15～30% (w/w);
Petroleum sulfonate: 5～10% (w/w);
Each component sum is absolutely.
8. oil field as claimed in claim 3 maximum swept volume chemical flooding oil production method is characterized in that: described synergistic surfactant recover the oil auxiliary agent---high molecular polymer and alkali comprise:
A、NaOH、KOH；
B、Na
2C0
3、NaHC0
3、Na
3P0
4；
C, polyacrylamide, xanthans.
9. as claim 7 or 8 described oil fields maximum swept volume chemical flooding oil production method, it is characterized in that: described surfactant, high molecular polymer, the collaborative use of alkali, the concentration of use is:
Surfactant working concentration: 0.05%～1.0% (w/w), adopting solvent is water;
Polymer working concentration: 0.01%～1.0% (w/w), adopting solvent is water;
Alkali is worked in coordination with working concentration: 0.01%～2.0% (w/w), adopting solvent is water.
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| CN102418506A (en) * | 2012-01-10 | 2012-04-18 | 孙安顺 | Chemical flooding injection method for improving recovery rate of crude oil |
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| CN106801597A (en) * | 2015-11-26 | 2017-06-06 | 中国石油化工股份有限公司 | Heavy crude reservoir combined type flooding method and displacement composition |
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| CN111154471A (en) * | 2018-11-07 | 2020-05-15 | 中国石油天然气股份有限公司 | Composite oil displacement agent containing sodium chloride and preparation method thereof |
| CN112228055A (en) * | 2020-11-10 | 2021-01-15 | 中国石油天然气股份有限公司 | Method and device for determining conversion opportunity in two-three combined development mode |
| CN112228055B (en) * | 2020-11-10 | 2024-03-26 | 中国石油天然气股份有限公司 | Method and device for determining conversion time under two-three combined development mode |
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