CN103834379A - Wormlike micelle foam system and method for enhancing oil recovery by using same - Google Patents
Wormlike micelle foam system and method for enhancing oil recovery by using same Download PDFInfo
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- CN103834379A CN103834379A CN201410003075.5A CN201410003075A CN103834379A CN 103834379 A CN103834379 A CN 103834379A CN 201410003075 A CN201410003075 A CN 201410003075A CN 103834379 A CN103834379 A CN 103834379A
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- sodium
- gas
- vermiculate glues
- foam
- oil
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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
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
Abstract
The invention relates to a novel wormlike micelle enhanced foam system which comprises a specific wormlike micelle and gas. The invention further provides a method for enhancing oil recovery by using the wormlike micelle enhanced foam system. The method is characterized in that the wormlike micelle and gas are alternated, or the wormlike micelle and gas are injected into an oil-containing stratum after foaming in a foam generator. According to the invention, a stable foam system can be obtained through usage of wormlike micelle enhanced foam, and the foam system can block off high-permeability reservoir strata but does not block off low-permeability reservoir strata, thereby substantially enhancing oil recovery of a foam flooding system.
Description
Technical field
The invention belongs to oilfield chemistry field, relate to a kind of novel vermiculate glues foam system and the method by its raising recovery ratio.Described method can increase substantially the recovery ratio of crude oil tertiary oil recovery.
Background technology
In underground Oil extraction process, conventionally in underground tryphine, pierce extraction well.Due to the autogenous pressure of oil reservoir, crude oil automatically via extraction well stream to earth's surface, this is called primary oil recovery.But because the autogenous pressure of oil reservoir reduces very soon, primary oil recovery only can a small amount of crude oil of extraction.In this case, need to carry out secondary oil recovery, water is injected to underground tryphine via water injection well, crude oil in the underground reservoir rock direction along water injection well to extraction well be flowed, extraction crude oil thus.But primary oil recovery and secondary oil recovery only can be exploited out 40% left and right of underground crude oil, most of crude oil is trapped in the underground exploitation that needs.The Application and Development that the tertiary oil recoveries such as therefore, thermal recovery, chemical flooding, gas drive improve recovery efficiency technique is imperative.
Gas drive is development in recent years one of tertiary oil recovery technology the most rapidly, and alkane, carbonic acid gas, nitrogen even air all can be used as the displacing agent of gas drive.But due to low density, low viscosity and the high workability of gas, compared with water drive, be subject to the impact of reservoir heterogeneity larger, be very easy to fingering phenomenon occurs, cannot involve hyposmosis region, make to improve oil recovery factor effect and be restricted.
By adding tensio-active agent, make the form displacement of gas with aerated fluid, be reduced in the velocity of flow in most permeable zone by the increase of aerated fluid apparent viscosity, improve sweep efficiency, can improve oil recovery factor.Because pore forming material itself is tensio-active agent, there is interfacial activity again, can reduce oil/water interfacial tension, enlarge markedly capillary number, can bring into play better effect, increase substantially once oil recovery factor.
But a large amount of indoor and field test that foam flooding method is carried out shows, the unstable of foam system has hindered the success of foam flooding technology and has applied.Therefore, need the stability of foam in reinforced foam displacement system.
Have at present the stability that two kinds of methods can reinforced foam, 1) add polymer formation strengthening foam; 2) add solid phase particles to form heterogeneous foam.
CN101314710A discloses a kind of foam profile agent, and it is formulated after being mixed with whipping agent by the functional polymer aqueous solution, and in adjusting driving agnet, density of foaming agent is 0.05～1wt%.
CN1651545A discloses a kind of method that improves oil deposil erude petroleum recovery ratio, its by the mixing solutions of polyacrylamide, foaming agent and water and gas alternately or according to underground liquid: gas=1:0.01-2 volume ratio is mixed injection water injection well.
Zhang Xiansong etc., " Polymer Enhanced Foam Composited Flooding System experimental study ", oil and gas journal (Jianghan Petroleum College's journal), the 28th the 2nd phase of volume, a kind of polymer enhanced foam flooding oil systems is disclosed for 2006 4, it is shutoff oil reservoir macropore effectively, improves interlayer injectivity profile, thereby can improve greatly oil recovery factor.
Li Binfei etc., " heterogeneous foam system transfer drive test ", China University Of Petroleum Beijing's journal (natural science edition), the 34th the 4th phase of volume, a kind of heterogeneous foam system for tertiary oil recovery in 2010, it forms by composite foam and polymer gel micro-sphere.
Li Zhaomin etc., " heterogeneous foam system deep profile controlling experimental study ", oil-gas geology and recovery ratio, the 19th volume l phase, a kind of novel deep profile controlling agent is disclosed in January, 2012, it is by by gel micro-ball and compound formation of foam compound system (heterogeneous foam system), and it has gel micro-ball deep profile controlling and the strong feature of foam blocking ability.
The polymer enhanced foam system of prior art and the heterogeneous foam that contains solid phase particles can reinforced foam stability, but, large-sized polymkeric substance or solid particulate are in the high permeable reservoir strata of shutoff, also can stop up low permeability reservoir, make hyposmosis region cannot involve and cause oil reservoir injury, the raising oil recovery factor effect of foam flooding system is restricted.
invention summary
The inventor finds through studying for a long period of time unexpectedly first, in the time using vermiculate glues reinforced foam, can not only obtain highly stable foam system, plays the effect of the high permeable reservoir strata of shutoff.The more important thing is, the Molecular Organized Assemblies that the small molecules that vermiculate glues system is is only 1～2nm by molecular dimension forms under non covalent bond effect, have the advantages that to dissociate fast and recombinate, the effectively high permeable reservoir strata of shutoff of high stable foam system that this forms vermiculate glues, also can be by the nano-scale pore structure of low permeability reservoir, and then reach expand involve region and to reservoir without injury, thereby greatly improve the raising oil recovery factor effect of foam flooding system.
Therefore, the object of the invention is to overcome described prior art shortcoming, a kind of foam system of novel vermiculate glues enhancing and the method with its raising oil recovery factor are provided first.
detailed Description Of The Invention
The foam system that the present invention provides a kind of vermiculate glues to strengthen first, described system comprises specific vermiculate glues and gas.The present invention also provides a kind of method that uses the foam system of described vermiculate glues enhancing to improve oil recovery factor, it is characterized in that: described vermiculate glues and gas are bubbled rear or vermiculate glues and gas are alternately injected to oil-bearing formation in frothing machine.
In the inventive method, vermiculate glues used can be the applicant in the vermiculate glues described in the Chinese patent application 201310300604.3 of submission on July 18th, 2013, and described system comprises alkyl sulfo betaines, alkylsurfuric acid natrium surfactant and optional auxiliary agent.
Described alkyl sulfo betaines is selected from hexadecyl sultaine, octadecyl sultaine or its combination, and described sodium alkyl sulfate is selected from ten sodium alkyl sulfates, sodium lauryl sulphate, Trombovar or its combination.
Described vermiculate glues system also can comprise auxiliary agent.Suitable auxiliary agent is known in the field.Particularly, described auxiliary agent can be selected from one of following or combination: poly-epoxy group(ing) sodium succinate, poly (sodium aspartate), 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid four sodium, Amino Trimethylene Phosphonic Acid five sodium, ethylene diamine tetra methylene phosphonic acid five sodium, diethylenetriamine five methylenephosphonic acid five sodium.Described auxiliary agent can shield divalent-metal ion Ca
2+and Mg
2+, improve interface performance and viscoelastic property and foaming properties that this vermiculate glues system is relevant to oil displacement efficiency.
Vermiculate glues system used in the present invention can be at total mineralization 5000-20000mg/L, wherein containing Ca
2+and Mg
2+total concn is to use in the mineralized water of 200-3500mg/L.Vermiform system of the present invention has excellent salt tolerance, and it can be at Ca
2+and Mg
2+total concn is up in the mineralized water of 3500mg/L and uses.
In preferred embodiments, vermiculate glues system of the present invention comprises alkyl sulfo betaines, alkylsurfuric acid natrium surfactant and auxiliary agent.
The molar fraction that sodium alkyl sulfate in vermiculate glues system of the present invention accounts for sodium alkyl sulfate and alkyl sulfo betaines integral molar quantity is 0.2-0.6, is preferably 0.2-0.4, more preferably 0.2-0.3.
The consumption of auxiliary agent is 0.0-0.5 quality %, is preferably 0.15-0.35 quality %, based on the total mass of described vermiculate glues system.In the inventive method, gas used is known to the person skilled in the art, for example and be not limited to lower paraffin hydrocarbons (as methane, ethane, propane etc.), carbonic acid gas, nitrogen, air, stack gas, Sweet natural gas etc.
In the methods of the invention, by vermiculate glues and gas alternately or described vermiculate glues and the gas injection oil-bearing formation afterwards that bubbles in frothing machine.The in the situation that of injecting oil-bearing formation after described vermiculate glues and gas bubble in frothing machine, described vermiculate glues system and the volume ratio of described gas under standard conditions can be 1:1-1:10, are preferably 1:1-1:5.
The present invention uses vermiculate glues reinforced foam can obtain highly stable foam system, the high permeable reservoir strata of its energy shutoff, but can not stop up low permeability reservoir, thus greatly improve the raising oil recovery factor effect of foam flooding system.
Particularly, the present invention relates to following technical scheme:
1. the foam system that vermiculate glues strengthens, described system comprises vermiculate glues and the gas for bubbling, described vermiculate glues comprises alkyl sulfo betaines, alkylsurfuric acid natrium surfactant.
2. according to 1 system, wherein said alkyl sulfo betaines is selected from hexadecyl sultaine, octadecyl sultaine or its combination.
3. according to 1 or 2 system, wherein said sodium alkyl sulfate is selected from ten sodium alkyl sulfates, sodium lauryl sulphate, Trombovar or its combination.
4. according to the system of any one in 1-3, described vermiculate glues also comprises auxiliary agent.
5. according to the system of claim 4, wherein said auxiliary agent is selected from one of following or combination: poly-epoxy group(ing) sodium succinate, poly (sodium aspartate), 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid four sodium, Amino Trimethylene Phosphonic Acid five sodium, ethylene diamine tetra methylene phosphonic acid five sodium, diethylenetriamine five methylenephosphonic acid five sodium.
6. according to the system of any one in 1-5, wherein to account for the molar fraction of sodium alkyl sulfate and alkyl sulfo betaines integral molar quantity be 0.2-0.6 to sodium alkyl sulfate, is preferably 0.2-0.4, more preferably 0.2-0.3.
7. according to the system of any one in 1-6, wherein said gas is lower paraffin hydrocarbons, carbonic acid gas, nitrogen, air, stack gas or Sweet natural gas or its mixture.
8. a method that uses the foam system of the vermiculate glues enhancing of any one in 1-7 to improve oil recovery factor, it is characterized in that: described vermiculate glues and gas are alternately injected to oil-bearing formation, or inject oil-bearing formation after described vermiculate glues and gas are bubbled in frothing machine.
9. according to 8 method, wherein said vermiculate glues and the volume ratio of described gas under standard conditions can be 1:1-1:10, are preferably 1:1-1:5.
Embodiment
Describe in more detail the present invention below by embodiment, but these embodiment limit scope of the present invention never in any form.
Embodiment 1: the foam flooding system that hexadecyl sultaine/sodium lauryl sulphate vermiculate glues strengthens
1. the preparation of vermiculate glues: taking 0.28g sodium lauryl sulphate and 1.18g hexadecyl sultaine (wherein sodium lauryl sulphate account for the molar fraction of sodium lauryl sulphate and hexadecyl sultaine integral molar quantity be 0.25) in 500ml beaker and adding the total mineralizatioies of different amounts is 8951mgL
-1, wherein Ca
2+concentration is 200mgL
-1, Mg
2+concentration is 100mgL
-1mineralized water.At 35 ℃, utilize German IKA-WATERKE stirrer to stir under 200 revs/min and mix to solution for 10 minutes, place 60 minutes.
2. vermiculate glues foam system foaming power and froth stability experiment
Prepared vermiculate glues solution 100ml adopts paddling process the lower stirring of 7000 revs/min 3 minutes, is poured into rapidly in graduated cylinder and reads and record foaming volume; And then record and separate out the required time of 50ml liquid with stopwatch.
Following table 1 has shown under different concns, viscosity (η) and the half foam life period of hexadecyl sultaine/sodium lauryl sulphate mixed system, wherein probe temperature is 60 ℃, and the molar fraction that sodium lauryl sulphate accounts for sodium lauryl sulphate and hexadecyl sultaine integral molar quantity is 0.25.The wherein gross weight of tensio-active agent massfraction based on this system.As can be seen from Table 1, for this system, when tensio-active agent total mass mark is higher than 0.22% time, the viscosity of this system is higher than the viscosity of water, and this shows to have formed in system vermiculate glues; The froth stability that forms vermiculate glues system will be significantly higher than conventional surfactants solution.In the time that tensio-active agent massfraction is 0.73%, the transformation period of foam is 3600 seconds.
| Tensio-active agent massfraction/% | Viscosity/mpa.s | Foaming volume/ml | Half foam life period/s |
| 0.07 | 0.56 | 380 | 272 |
| 0.15 | 1.15 | 360 | 410 |
| 0.22 | 2.01 | 350 | 683 |
| 0.30 | 4.61 | 330 | 1187 |
| 0.37 | 10.2 | 280 | 1620 |
| 0.55 | 52.8 | 240 | 3340 |
| 0.73 | 148.7 | 190 | 3600 |
3. lab simulation oil displacement experiment
(1) vermiculate glues foam system preparation: above-mentioned hexadecyl sultaine/sodium lauryl sulphate, wherein total surfactant concentration is 0.73%, the molar fraction of sodium lauryl sulphate is 0.25; Foaming is air with gas; Control vapour-liquid ratio is 1:1, in frothing machine, bubbles.
Jinzhou You Qu oil density 0.935g.cm
-3, viscosity 82mPa.s (50 ℃);
Formula is 6s 60 ℃ of down cut speed
-1time viscosity 144.7mPa.s, with the mixed interfacial tension 2.0 × 10 of Jinzhou You Qu crude oil
-2mNm
-1(60 ℃);
(2) oil displacement efficiency experiment
The preparation of simulation fill out sand tube and master data (experimental temperature is 60 ℃) for the displacement of reservoir oil:
Sand-packed model is Φ 25mm × 500mm, and it is 1169mD that water is surveyed rate of permeation;
At 60 ℃, carry out imitation oil displacement experiment experiment, first salt solution is driven to Produced Liquid water ratio 98%, and then the vermiculate glues foam flooding fluid of injection 1.2PV, after having noted, changing salt solution into, to be driven to pressure reduction stable, find the fill out sand tube for 1169mD, vermiculate glues foam flooding system can further improve oil recovery factor and reach 38.8% on water drive basis.
As can be seen here, vermiculate glues foam system of the present invention can improve oil recovery factor greatly.
Comparative example 1
Utilize total mineralization for 8951mgL according to the method described in Chinese patent application 201310300604.3
-1, wherein Ca
2+concentration is 200mgL
-1, Mg
2+concentration is 100mgL
-1mineralized water preparation vermiculate glues system, hexadecyl sultaine/sodium lauryl sulphate system that the molar fraction that is sodium lauryl sulphate is 0.25, find to be 0.73% time at total surfactant concentration, in the time that sand-packed model rate of permeation is 1169mD, it is 23.2% that vermiculate glues drives raising recovery ratio.
Can be found out by above-mentioned comparative example, vermiculate glues foam flooding system of the present invention raising recovery ratio effect than the vermiculate glues system described in Chinese patent application 201310300604.3 under identical condition exceeds 15.6%.
Embodiment 2
According to the program of embodiment 1, prepare vermiculate glues foam flooding system, difference is to use octadecyl sultaine/sodium lauryl sulphate as raw material.
Research on the fill out sand tube of 988mD shows, this vermiculate glues foam flooding system can further improve oil recovery factor and reach 39.1% on water drive basis.
Embodiment 3
According to the program of embodiment 1, prepare vermiculate glues foam flooding system, difference is to use hexadecyl sultaine/ten sodium alkyl sulfate as raw material.
Research on the fill out sand tube of 1260mD shows, this vermiculate glues foam flooding system can further improve oil recovery factor and reach 40.5% on water drive basis.
Embodiment 4
According to the program of embodiment 1, prepare vermiculate glues foam flooding system, difference is to use octadecyl sultaine/ten sodium alkyl sulfate as raw material.
Research on the fill out sand tube of 895mD shows, this vermiculate glues foam flooding system can further improve oil recovery factor and reach 38.6% on water drive basis.
The present invention uses vermiculate glues reinforced foam can obtain highly stable foam system, the high permeable reservoir strata of its energy shutoff, but can not stop up low permeability reservoir, thus greatly improve the raising oil recovery factor effect of foam flooding system.
Claims (9)
1. the foam system that vermiculate glues strengthens, described system comprises vermiculate glues and the gas for bubbling, and described vermiculate glues comprises alkyl sulfo betaines, alkylsurfuric acid natrium surfactant.
2. according to the system of claim 1, wherein said alkyl sulfo betaines is selected from hexadecyl sultaine, octadecyl sultaine or its combination.
3. according to the system of claim 1 or 2, wherein said sodium alkyl sulfate is selected from ten sodium alkyl sulfates, sodium lauryl sulphate, Trombovar or its combination.
4. according to the system of any one in claim 1-3, described vermiculate glues also comprises auxiliary agent.
5. according to the system of claim 4, wherein said auxiliary agent is selected from one of following or combination: poly-epoxy group(ing) sodium succinate, poly (sodium aspartate), 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid four sodium, Amino Trimethylene Phosphonic Acid five sodium, ethylene diamine tetra methylene phosphonic acid five sodium, diethylenetriamine five methylenephosphonic acid five sodium.
6. according to the system of any one in claim 1-5, wherein to account for the molar fraction of sodium alkyl sulfate and alkyl sulfo betaines integral molar quantity be 0.2-0.6 to sodium alkyl sulfate, is preferably 0.2-0.4, more preferably 0.2-0.3.
7. according to the system of any one in claim 1-6, wherein said gas is lower paraffin hydrocarbons, carbonic acid gas, nitrogen, air, stack gas or Sweet natural gas or its mixture.
8. a use is according to the method for the foam system raising oil recovery factor of the vermiculate glues enhancing of any one in claim 1-7, it is characterized in that: described vermiculate glues and gas are alternately injected to oil-bearing formation, or inject oil-bearing formation after described vermiculate glues and gas are bubbled in frothing machine.
9. method according to Claim 8, wherein said vermiculate glues and the volume ratio of described gas under standard conditions can be 1:1-1:10, are preferably 1:1-1:5.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134146A (en) * | 2015-07-07 | 2015-12-09 | 西北大学 | Method for oil displacement using carbon dioxide and foam |
| CN110157403A (en) * | 2019-05-08 | 2019-08-23 | 中国石油大学(北京) | A kind of low-permeability oil deposit oil displacement agent |
| CN110699057A (en) * | 2019-09-27 | 2020-01-17 | 中国石油化工股份有限公司 | Temperature-resistant high-strength foam system with synergistic lamellar nano-particles and preparation method thereof |
| CN112080269A (en) * | 2020-10-13 | 2020-12-15 | 中国石油大学(北京) | Micro-bubble fracturing fluid, preparation method and application |
| CN113136192A (en) * | 2021-04-06 | 2021-07-20 | 西安石油大油气科技有限公司 | Low-corrosivity foaming agent for air foam flooding for oil exploitation and preparation method thereof |
| CN113150762A (en) * | 2021-04-21 | 2021-07-23 | 中国石油大学(华东) | Supermolecule oil displacement system with viscoelasticity and ultralow interfacial tension and application |
| CN113292982A (en) * | 2021-06-02 | 2021-08-24 | 中国石油大学(华东) | Viscoelastic surfactant foam system and preparation method and application thereof |
| CN116904176A (en) * | 2023-06-27 | 2023-10-20 | 中国石油大学(北京) | Carbon dioxide foam system synergistically enhanced by nano particles and worm micelles and application thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134146A (en) * | 2015-07-07 | 2015-12-09 | 西北大学 | Method for oil displacement using carbon dioxide and foam |
| CN110157403A (en) * | 2019-05-08 | 2019-08-23 | 中国石油大学(北京) | A kind of low-permeability oil deposit oil displacement agent |
| CN110699057A (en) * | 2019-09-27 | 2020-01-17 | 中国石油化工股份有限公司 | Temperature-resistant high-strength foam system with synergistic lamellar nano-particles and preparation method thereof |
| CN112080269A (en) * | 2020-10-13 | 2020-12-15 | 中国石油大学(北京) | Micro-bubble fracturing fluid, preparation method and application |
| CN112080269B (en) * | 2020-10-13 | 2021-06-25 | 中国石油大学(北京) | Micro-bubble fracturing fluid, preparation method and application |
| CN113136192A (en) * | 2021-04-06 | 2021-07-20 | 西安石油大油气科技有限公司 | Low-corrosivity foaming agent for air foam flooding for oil exploitation and preparation method thereof |
| CN113150762A (en) * | 2021-04-21 | 2021-07-23 | 中国石油大学(华东) | Supermolecule oil displacement system with viscoelasticity and ultralow interfacial tension and application |
| CN113150762B (en) * | 2021-04-21 | 2023-11-14 | 中国石油大学(华东) | Supermolecule oil displacement system with viscoelasticity and ultralow interfacial tension and application thereof |
| CN113292982A (en) * | 2021-06-02 | 2021-08-24 | 中国石油大学(华东) | Viscoelastic surfactant foam system and preparation method and application thereof |
| CN113292982B (en) * | 2021-06-02 | 2023-02-17 | 中国石油大学(华东) | Viscoelastic surfactant foam system and preparation method and application thereof |
| CN116904176A (en) * | 2023-06-27 | 2023-10-20 | 中国石油大学(北京) | Carbon dioxide foam system synergistically enhanced by nano particles and worm micelles and application thereof |
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