CN104830302A - Binary composite oil dispelling system and optimization method thereof - Google Patents
Binary composite oil dispelling system and optimization method thereof Download PDFInfo
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- CN104830302A CN104830302A CN201510214109.XA CN201510214109A CN104830302A CN 104830302 A CN104830302 A CN 104830302A CN 201510214109 A CN201510214109 A CN 201510214109A CN 104830302 A CN104830302 A CN 104830302A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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Abstract
The invention discloses a binary composite oil dispelling system and an optimization method thereof. The oil dispelling system is prepared by compounding polymer and a surfactant; the polymer is partly-hydrolyzed polyacrylamide, the surfactant is one or two of anionic surfactant (petroleum sulfonate) and anionic-non-ionic surfactant, and the oil dispelling system is applied to chemical oil dispelling of heterogeneous oil reservoir. By adjusting the interface tension of the binary composite system of polymer and surfactant, the oil yield of middle/high permeability oil reservoir can be prominently increased, the provided optimization method is especially suitable for efficient chemical oil dispelling of middle/high permeability heterogeneous oil reservoir, the reagent cost is effectively reduced, and the risk of chemical oil dispelling is avoided.
Description
Technical field
The invention belongs to chemical displacement of reservoir oil technical field, be specifically related to the optimization method of a kind of binary combination flooding oil systems and this binary combination flooding oil systems formula.
Background technology
Although polymer flooding is the chemical displacement of reservoir oil technology of comparative maturity, it mainly improves oil recovery factor by improving sweep efficiency.Because the raising of recovery ratio is by improving sweep efficiency and displacement efficiency realization, so polymer flooding is one improve the incomplete technology of recovery mechanism, in order to make up the deficiency of enhancing oil recovery in polymer flooding mechanism, Surfactant/Polymer binary combination flooding oil tech can be used.This technology both improves sweep efficiency by improving oil-displacing agent viscosity, can reduce again the displacement efficiency of oil water interfacial tension and then raising oil-displacing agent, reach the object improving oil recovery factor larger.
Traditional theory is thought, only has oil water interfacial tension to reach ultralow and (is namely less than 1.0 × 10
-2mN/m), the displacement efficiency of flooding system just reaches the degree that can increase substantially recovery ratio, and therefore it is generally acknowledged that oil water interfacial tension reaches ultralow is the major criterion screening binary combination flooding oil systems.But this theory does not consider that the change of rock wettability and Reservoir Heterogeneity are on the contribution and the impact that improve recovery ratio.
If oil reservoir is complete homogeneous, oil-displacing agent sweep efficiency will be very high, and the flooding system obviously with ultra low interfacial tension has better oil displacement efficiency due to its high washing oil ability.But for a certain specific heterogeneous reservoir, when the interfacial tension of displacing fluid and crude oil reaches a certain value, displacing fluid is while raising displacement efficiency, can also the oil droplet of stable emulsifying different-grain diameter size, play the deep rock tunneling effect of self fluid, improve the sweep efficiency of follow-up displacing fluid, thus reach maximum recovery ratio.
Research finds, the oil droplet that ultralow interfacial tension system elutes is little, dispersity is high, and be easily out of shape (because interfacial tension is low, interfacial energy is little), very easily by pore throat, therefore taken away along Thief zone macropore by subsequent fluid very soon, can not significantly improve resistance coefficient, the sweep efficiency thus improving subsequent fluid is limited in one's ability.From macroscopic view, to the efficient washing oil of most permeable zone, increase the nonuniformity (secondary nonuniformity) on stratum further.And the oil droplet that low tension system elutes is relatively large, be not easy to pass through pore throat, thus produce drag effect (Jamin effect), the result of this drag effect superposition, fluid must be made preferentially to be improved by the resistance coefficient of Thief zone macropore, thus improve the sweep efficiency of subsequent fluid.The oil droplet of these emulsifications simultaneously, under the stabilization of polymkeric substance, can play deep rock tunneling effect more enduringly, compensate for the deficiency of polymkeric substance profile control ability.The synthesis result of this raising sweep efficiency and displacement efficiency, makes oil water interfacial tension there is optimum value, but not ultralow value.
Summary of the invention
An object of the present invention is for the deficiencies in the prior art, a kind of binary combination flooding oil systems is provided, a kind of optimization method screening this binary combination flooding oil systems formula is provided simultaneously, enable the oil displacement efficiency that binary combination flooding oil systems reaches best, the method is specially adapted to the displacement of reservoir oil of Thief zone heterogeneous reservoir.
A kind of binary combination flooding oil systems provided by the invention, formed by polymkeric substance and surfactant compound, described polymkeric substance is the polyacrylamide of partial hydrolysis, described tensio-active agent is one or both in anion surfactant sulfonated petro-leum and anion-nonionic tensio-active agent, for the heterogeneous reservoir chemical displacement of reservoir oil.
A kind of binary combination flooding oil systems optimization method provided by the invention, comprises the following steps:
Step 1: obtain polymers soln with Simulated Water dilution polyacrylamide solution, then the tensio-active agent that mass percent is 0.05% ~ 0.5% is added, make the viscosity number of polymkeric substance/Surfactant Mixing Systems remain on 10 ~ 20mPas, the interfacial tension order of magnitude is between 10
-4~ 10
-1between mN/m, obtain serial binary combination flooding oil systems formula.
Step 2: use double-deck non-homogeneous model to carry out imitation oil displacement experiment test, this model permeability grade is 1:2, and cementing square rock core is of a size of 4.5cm × 4.5cm × 30cm, and hypotonic scope is 0.8 ~ 1.2 μm
2, Thief zone scope is 2.0 ~ 2.5 μm
2.Model is vacuumized, after saturated oil field mock water, more saturated oil field simulated oil, leave standstill aging, then take out.
Step 3: connect driving device flow process, water drive is carried out with the rate of displacement of 1mL/min, after water ratio arrives 95%, the binary combination flooding oil systems of 0.3 pore volume injected is injected with the rate of displacement of 1mL/min, then continue water drive with the rate of displacement of 1mL/min and again reach more than 95% to water ratio, be standard to the maximum according to the increment recovering the recovery ratio that water drive reaches after injection binary complex system and carry out optimization of C/C composites.
Further, described in described step 1, Simulated Water is formulated by oilfield injection water.
Further, the viscosity of polymers soln described in described step 1 is consistent with former oil viscosity.
Further, tensio-active agent described in described step 1 is one or both in anion surfactant sulfonated petro-leum and anion-nonionic tensio-active agent.
Further, leaving standstill aging described in described step 2 is aging 48h at 65 DEG C.
By comparing with prior art, beneficial effect of the present invention is: by the interfacial tension of telomerized polymer/tensio-active agent binary complex system, reach the effect of the oil recovery factor significantly improving medium to high permeable oil reservoir, the method is particularly suitable for the efficient chemical displacement of reservoir oil of medium to high permeable heterogeneous reservoir, effectively can reduce reagent cost, evade chemical displacement of reservoir oil risk.
Accompanying drawing explanation
Figure 1 shows that the oil displacement efficiency figure of binary combination flooding oil systems of the present invention.
Embodiment
Hereafter will describe content of the present invention in conjunction with specific embodiments in detail.It should be noted that the combination of technical characteristic or the technical characteristic described in following embodiment should not be considered to isolated, they can mutually be combined thus be reached better technique effect.
Embodiment 1
1, experiment material and compound method
In the present embodiment, polymkeric substance selects the polyacrylamide of partial hydrolysis; Tensio-active agent selects anion surfactant sulfonated petro-leum KPS and the composite product with anion-nonionic tensio-active agent YG210-10 thereof; Simulated Water is formulated by the injection water of certain offshore oilfield, and total mineralization is 8094mg/L; Be used for measuring the crude oil of oil water interfacial tension from the output gas-free oil of same offshore oilfield; Then aviation kerosene is used to be diluted to the Simulation of Crude Oil of 15.1mPas this gas-free oil when being used for carrying out displacement test.
2, experiment condition
Viscosimetric analysis is at 65 DEG C, 7.34S
-1under carry out; Other test is carried out all at the same temperature.
3, experimentation
Step 1: preparation general polymer (polyacrylamide) mother liquor, is then diluted to the polymers soln of certain mass concentration, makes the viscosity of polymers soln consistent with the viscosity of Simulation of Crude Oil with simulation preparation water; Single tensio-active agent or the compound surfactant of 0.05% ~ 0.5% is added in above-mentioned polymers soln, measure the polymkeric substance/surfactant compound system of preparation and the interfacial tension of crude oil (the output crude oil of certain offshore oilfield), make the viscosity number of system remain near 15.1mPas, the interfacial tension order of magnitude is between 10
-4~ 10
-1between mN/m, thus obtain serial binary combination flooding formula, gained binary combination flooding oil systems formula is as shown in table 1.
Step 2: use double-deck non-homogeneous model to carry out imitation oil displacement experiment test.This model permeability grade is 1:2, and cementing square rock core is of a size of 4.5cm × 4.5cm × 30cm, and hypotonic scope is 0.8 ~ 1.2 μm
2, Thief zone scope is 2.0 ~ 2.5 μm
2.After model being vacuumized rear certain oil field mock water saturated, then certain oil field simulated oil saturated, take out after aging 48h at putting into 65 DEG C.
Step 3: connect driving device flow process, carry out water drive with the rate of displacement of 1mL/min.After water ratio arrives 95%, the binary combination flooding oil systems formula of 0.3 pore volume injected is injected with the rate of displacement of 1mL/min, then continue water drive with the rate of displacement of 1mL/min and again reach more than 95% to water ratio, observe the change with injection pore volume of water ratio and recovery ratio; According to inject to recover after binary complex system recovery ratio increment that water drive reaches for maximum come optimization of C/C composites.
The binary combination flooding oil systems formula table that table 1 is to be screened
The recovery ratio of the table 2 different ingredients displacement of reservoir oil and increment thereof
4, interpretation of result
In use table 1, binary combination flooding oil systems is filled a prescription the operation steps in empirically process, displacement test is carried out with non-homogeneous model, oil production curve is drawn out according to test-results, as shown in Figure 1, in figure, rhombus represents water ratio, trilateral represents recovery ratio, and calculates recovery ratio increment, and by result statistics in table 2.As can be seen from Table 2, recovery ratio effect is improved it is preferred that 2
#formula, the increment of its waterflood recovery efficiency factor is maximum, but its interfacial tension is only 1.865 × 10
-2mN/m, does not arrive ultra low interfacial tension value and (is namely less than 1.0 × 10
-2mN/m).The binary combination flooding oil systems that the present invention optimizes, when interfacial tension does not need to reach ultralow, it improves recovery ratio amplitude more than 30%, be expected to replace traditional ternary composite driving, and reduce screening difficulty and the working concentration of tensio-active agent in binary combination flooding, become the tertiary oil recovery technology that more has application potential.
Although give some embodiments of the present invention, it will be understood by those of skill in the art that without departing from the spirit of the invention herein, can change embodiment herein.Above-described embodiment is exemplary, should using embodiment herein as the restriction of interest field of the present invention.
Claims (6)
1. a binary combination flooding oil systems, it is characterized in that, formed by polymkeric substance and surfactant compound, described polymkeric substance is the polyacrylamide of partial hydrolysis, described tensio-active agent is one or both in anion surfactant sulfonated petro-leum and anion-nonionic tensio-active agent, for the heterogeneous reservoir chemical displacement of reservoir oil.
2. a binary combination flooding oil systems optimization method, is characterized in that, comprises the following steps:
Step 1: obtain polymers soln with Simulated Water dilution polyacrylamide solution, then the tensio-active agent that mass percent is 0.05% ~ 0.5% is added, make the viscosity number of polymkeric substance/Surfactant Mixing Systems remain on 10 ~ 20mPas, the interfacial tension order of magnitude is between 10
-4~ 10
-1between mN/m, obtain serial binary combination flooding oil systems formula;
Step 2: use double-deck non-homogeneous model to carry out imitation oil displacement experiment test, model is vacuumized, after saturated oil field mock water, more saturated oil field simulated oil, leave standstill aging, then take out;
Step 3: connect driving device flow process, water drive is carried out with the rate of displacement of 1mL/min, after water ratio arrives 95%, the binary combination flooding oil systems of 0.3 pore volume injected is injected with the rate of displacement of 1mL/min, then continue water drive with the rate of displacement of 1mL/min and again reach more than 95% to water ratio, be standard to the maximum according to the increment recovering the recovery ratio that water drive reaches after injection binary complex system and carry out optimization of C/C composites.
3. a kind of binary combination flooding oil systems optimization method as claimed in claim 2, it is characterized in that, described in described step 1, Simulated Water is formulated by oilfield injection water.
4. a kind of binary combination flooding oil systems optimization method as claimed in claim 2, it is characterized in that, the viscosity of polymers soln described in described step 1 is consistent with former oil viscosity.
5. a kind of binary combination flooding oil systems optimization method as claimed in claim 2, is characterized in that, tensio-active agent described in described step 1 is one or both in anion surfactant sulfonated petro-leum and anion-nonionic tensio-active agent.
6. a kind of binary combination flooding oil systems optimization method as claimed in claim 2, is characterized in that, leaving standstill aging described in described step 2 is aging 48h at 65 DEG C.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105651651A (en) * | 2015-12-25 | 2016-06-08 | 中国石油天然气股份有限公司 | Method for screening surfactant in polymer-surfactant binary flooding |
| CN105863587A (en) * | 2016-06-01 | 2016-08-17 | 中国海洋石油总公司 | Method for determining alternating injection time of polymer flooding |
| CN106589228A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Low permeability reservoir flooding microemulsion system and preparation method thereof |
| CN106590594A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Method suitable for enhanced oil production of low-calcium and -magnesium oil reservoir |
| CN106590598A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Oil-displacing composition and preparation method thereof |
| CN106593374A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Intensified oil production method |
| CN108491625A (en) * | 2018-03-22 | 2018-09-04 | 中国石油大学(华东) | A kind of ternary composite oil-displacing system improves the prediction technique of recovery ratio |
| CN111650090A (en) * | 2020-05-25 | 2020-09-11 | 中国石油大学(北京) | Polymer meter residual quantity determination method and device for compound flooding produced water |
| CN112943192A (en) * | 2021-02-03 | 2021-06-11 | 中国石油天然气股份有限公司 | Mining method suitable for low-permeability conglomerate oil reservoir |
| CN118522388A (en) * | 2024-07-25 | 2024-08-20 | 北京科技大学 | Binary compound organic corrosion inhibitor optimization method, device, equipment and medium |
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| CN106590594B (en) * | 2015-10-20 | 2019-12-10 | 中国石油化工股份有限公司 | Method suitable for low-calcium-magnesium oil reservoir enhanced oil recovery |
| CN106589228B (en) * | 2015-10-20 | 2020-11-03 | 中国石油化工股份有限公司 | Microemulsion system for profile control and flooding for low-permeability oil reservoir and preparation method |
| CN106589228A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Low permeability reservoir flooding microemulsion system and preparation method thereof |
| CN106590594A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Method suitable for enhanced oil production of low-calcium and -magnesium oil reservoir |
| CN106590598A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Oil-displacing composition and preparation method thereof |
| CN106593374A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Intensified oil production method |
| CN106590598B (en) * | 2015-10-20 | 2019-12-10 | 中国石油化工股份有限公司 | Oil displacement composition and preparation method thereof |
| CN106593374B (en) * | 2015-10-20 | 2019-01-25 | 中国石油化工股份有限公司 | The method of intensified oil reduction |
| CN105651651B (en) * | 2015-12-25 | 2018-09-04 | 中国石油天然气股份有限公司 | Method for screening surfactant in polymer-surfactant binary flooding |
| CN105651651A (en) * | 2015-12-25 | 2016-06-08 | 中国石油天然气股份有限公司 | Method for screening surfactant in polymer-surfactant binary flooding |
| CN105863587B (en) * | 2016-06-01 | 2018-10-16 | 中国海洋石油集团有限公司 | A kind of determination method of polymer flooding alternating injection timing |
| CN105863587A (en) * | 2016-06-01 | 2016-08-17 | 中国海洋石油总公司 | Method for determining alternating injection time of polymer flooding |
| CN108491625A (en) * | 2018-03-22 | 2018-09-04 | 中国石油大学(华东) | A kind of ternary composite oil-displacing system improves the prediction technique of recovery ratio |
| CN111650090A (en) * | 2020-05-25 | 2020-09-11 | 中国石油大学(北京) | Polymer meter residual quantity determination method and device for compound flooding produced water |
| CN112943192A (en) * | 2021-02-03 | 2021-06-11 | 中国石油天然气股份有限公司 | Mining method suitable for low-permeability conglomerate oil reservoir |
| CN118522388A (en) * | 2024-07-25 | 2024-08-20 | 北京科技大学 | Binary compound organic corrosion inhibitor optimization method, device, equipment and medium |
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