CA2279874A1 - Oil production composition and its preparation method - Google Patents
Oil production composition and its preparation method Download PDFInfo
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- CA2279874A1 CA2279874A1 CA002279874A CA2279874A CA2279874A1 CA 2279874 A1 CA2279874 A1 CA 2279874A1 CA 002279874 A CA002279874 A CA 002279874A CA 2279874 A CA2279874 A CA 2279874A CA 2279874 A1 CA2279874 A1 CA 2279874A1
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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
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Colloid Chemistry (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
Abstract
The invention is referred to the oil production industry and in particular to oil production compositions based on hydrocarbon and/or oil solutions of surfactants which possess ultra low interface tension on the oil-water boundary that determines their ability to independently form stable oil in water type emulsions and show certain oil washing properties at the time of injection into the reservoir. Proposed composition for oil production contains a small number of ingredients. It is easy to prepare, forms kinetically and aggregately stable "oil in water" micro emulsion, as a result of slow adsorption the surfactant on the rock has a good oil washing property and the process is economical. The content of regulator-solvent in the developed composition of 15-25% of mass allows not only to effectively dissolve the surfactant initially in the regulator but also provide required colloid dispersion (close to molecular) state of asphaltene-resin components in oil which assists the formation of associates from surfactant molecules and polar oil components and slows down surfactant adsorption i.e. allows to wash a larger oil volume from the pore volume of the reservoir. 2 tables.
Description
OIL PRODUCTION COMPOSITION AND ITS PREPARATION METHOD
The invention is referred to the oil production industry and in particular to oil production compositions with the hydrocarbon and/or oil solutions base of surfactants which possess ultra low interface tension on the oil-water boundary that determines their independent ability to form stable "oil in water type" emulsions and show certain oil displacement properties at the time of injection into the reservoir.
The major disadvantage of known compositions is a short time of their effective impact when injected into the reservoir since due to adsorption of surfactants the compositions are "depleted" by the surfactant molecules which leads to the decrease in their oil displacement properties.
The objective of the invention is to create a composition that exhibits high oil displacement properties and low degree of surfactant adsorption in reservoir conditions.
To attain the stated objective the composition for oil production which consists of surfactants and the oil phase also contains a regulator - a substance which increases solubility of surfactants in the oil phase and provides colloid state of asphaltenes in oil.
As a result associates of polar asphaltene-resin oil components and surfactant molecules are formed in such a composition which decreases the number of free surfactant molecules in the composition and decreases the degree of their adsorption on the rock of the reservoir accordingly.
The percentage of components in the developed composition is as follows (% of mass):
Surfactants 15.0 - 25.0 Oil phase 50 - 70.0 Regulator 15.0 - 25.0 The product of condensation of ethylene oxide with hydrocarbon derivatives containing a mobile hydrogen atom is used as a surfactant, for instance, oxyethylene derivatives of fatty alcohols, acids, alkyl phenols and co-polymers of ethylene and propylene oxides, their trade versions such as OXY-FOS, Reapon-4B, AF, OP, Proxanol etc. are widely used as displacing, dispersion, wetting, demulsifying and other non-ionic surfactants in various industrial processes including oil production and refining.
As an oil phase merchantable oil with residual content of water and chloride salts no lower than Group III in quality (according to COST 9965-76 "Oil. Degree of Treatment for Refineries. Technical specifications") is used. To prepare the composition with mentioned surfactant component heavy oil (density of 900 kg/cm 3 and over) is used with a high content of asphaltenes and resins (not less than 10 and 30% of mass accordingly).
Light paraffin or parai~m-naphtene oils can not be applies for this purpose.
They have a weak dissolving ability for used surfactants; a comparatively low (within 1-2%
of mass) content of asphaltenes in such oils does not provide required "binding" of surfactant molecules by the colloid dispersed asphaltenes particles.
As a regulator - a substance, increasing solubility of non-ionic surfactant and impacting the colloid state of asphaltenes in the oil phase solvents are used. They have an unlimited solubility in respect to both asphaltene-resin oil components and used surfactant, for example, toluene, chloroform, tetrachloride hydrogen, nitrobenzene etc.
The method of preparation of the composition for oil production consists initially of an operation of surfactant and regulator blending (solution), the ratio being 1:1 (mass). Next, constantly mixing the system, 30 - 50% (mass) of the resulting solution is added to heavy, asphaltene-resin oil.
A known composition for oil production exists [Holm Le Roy W. "Soluble oil composition., Union Oil Co of California, US Patent, 252-8.55 D,E 21b 43/16, Ns3691072] called "soluble oil" (PH), which contains (% of volume): 45-90% of liquid hydrocarbons (oil, petroleum products with density of 0.75-0.85 g/m3);
4-10% of surfactants (alkylarylsulphonates which in their composition contain an alkyl chain of 10-20 carbon atoms); 0.5 - 8% of a polar solvent (secondary butyl alcohol) and 0.15% of a univalent cation salt (NaCI,KCL). Contacting water up to 40"/0 (volume) of water in the composition can "dissolve" as a micro emulsion, 'water in oil" type. With a high water content phase inversion takes place forming an "oil in water" micro emulsions.
Such micro emulsions known under the name of Maraflood or micellar dispersions have high oil displacement properties. The largest project of injecting such micro emulsion into Robinson sandstone in Illinois, undertaken by Marathon in the US [1] allows to extract 40 e3m3 of oil. However, complications in preparation of such a composition in field conditions and a high cost of conducting these treatments first of all due to high losses of surfactant in the reservoir as a result of their adsorption made the company look for more economical compositions.
Proposed composition for oil production unlike the prototype contains a smaller number of ingredients that are easier to prepare. The composition forms a more stable (kinetically and aggregately) "oil in water" type micro emulsion and as a result of slowed adsorption surfactant on the rock possesses a higher oil displacement property which makes it more economical.
The following examples illustrate the properties of proposed composition and prototype composition.
To prepare proposed compositions oxiethylene_products were selected as surfactants (non-ionic surfactants): OXIFOS, OZI~, OC-20, AF-12 and OP-10 with concentration within 15-20% (mass); 50% of oil phase (heavy merchantable oil, 950 kg/m3 in density, containing 11.2% of asphaltenes, 37.8% of resin, 2.1% of parai~m and no more than 1%
of water) and 15-25% (mass) of regulator-solvent (CCL4).
The prototype compositions were prepared with merchantable oil (850-kg/m density, 1.7% asphaltenes, 15.9% of resin, 2.8% of paraffin); 4 - 30% of anion active surfactant -alkylarylsulphonate - AACN - with molecular mass of 520; 0.5 - 8% of polar solvent (secondary butyl alcohol). As a salt of univalent ration NaCI was used which was introduced into the composition as a 0.3% water solution, total volume of which in the system was $0% (mass).
The method of preparation for the prototype composition was as follows: an anion surfactant was dissolved first in a polar solvent, the resulting solution was blended with the oil phase at such a ratio that the surfactant content in the oil solution would vary within 4 - 30% (mass). Later 1:1 (mass) 0.3% water based NaCI solution was added to the resulted HP.
To compare the properties of formed micro emulsions 1:1 (mass) 0.3% water based NaCI
solution was also added to the proposed composition.
Table 1 contains information on the ingredients content. Table 2 contains general physical and chemical properties of the proposed composition and the prototype composition.
One can see from Table 2 that oil displacement properties of the developed composition are considerably (several times) higher than similar properties of the prototype composition. However, developed compositions with the minimum surfactant content ( 1$% mass) turned out close (equal) in efficiency to the prototype composition where the surfactant content equals 30% mass, which is the maximum number. Based on this the lower limit of non-ionic surfactant content in the developed composition is 1$% of mass and as a top limit we accepted surfactant concentration within 2$% of mass for economic reasons.
The content of regulator-solvent in the developed composition of 1$-2$% of mass allows not only to effectively dissolve the surfactant initially in the regulator but also provide required colloid dispersion (close to molecular) state of asphaltene-resin components in oil which assists the formation of associates from surfactant molecules and polar oil components and slowers surfactant adsorption i.e. allows to wash a larger oil volume from the pore volume of the reservoir with the same composition volume.
The technology of application of developed oil production composition is simple and is not much different from known [2] Maraflood technology (micellar dispersions application).
Table 1 # Composition- In clients, %
of mass Surfactant Oil Solvent Micro emulsion phase type numberdensity% of type numberat 50 %HZO
asphalt enes 1 Proposed Oksif 1$ 0.950 11.2 CC 15 Oil in water 2 Prototype ARCH 4 0.850 1.7 Butanol8 Oil in water 3 Proposed Oksif 2$ 0.950 11.2 CC14 25 Oil in water 4 Prototype ARCH 3 Q 0.850 1.7 Butanol8 Oil in water Proposed OJK 1$ 0.950 11.2 CC 15 Oil in water 6 Proposed OJK 2$ 0.950 11.2 CC14 25 Oil in water 7 Proposed OC-20 1$ 0.950 11.2 CC 15 Oil in water 8 Proposed OC-20 2$ 0.950 11.2 CC14 25 Oil in water 9 Proposed AF-12 1$ 0.950 11.2 CC14 15 Oil in water Proposed AF-12 2$ 0.950 11.2 CC14 25 Oil in water 11 Proposed OP-10 1$ 0.950 11.2 CC14 15 Oil in water 12 Proposed OP-10 2$ 0.950 11.2 CC14 25 Oil in water Table 2 # CompositionCom sition meters _Micro emulsioneters 50% H20 Relative Viscosity, Viscosity, 100% displacement weight 20C
(~m3) MPa-s 20C MPa-s property, pore volume/solution volume 1 Pro sed 1055 170.0 10.7 Not less than 2 Proto 860 36.0 28.9 About 1 3 Pro 1075 47.7 8.5 Not less than 4 Proto 890 49.4 68.6 About 7 5 Pro sed 1060 180.7 12.8 About 8 6 sed 1075 45.0 9.5 Not less than 7 Pro sed 1065 180.9 12.6 About 8 8 Pr sed 1080 56.0 11.8 Not less than 9 Pro sed 1070 175.7 10.5 Around 7 10 Pro sed 1085 64.3 9.6 Not less than 11 Pro sed 1067 154.9 11.5 Around 8 12 X 1087 57.7 10.1 Not less than References:
1. Gogarthy M.B. Surfactant. "Oil and Gas J." 1977 Ns35, 253, 256, 258 Secondary oil recovery [Marathon Oil Co], Patent N1 MKI E 21 B 43/22 Ns 13$084 published 1$.09.72 2. Holm LeRoy W. Micellar flooding process for recovering oil from petroleum reserving.
[Union Oil Co. Of California] US Patent NKI 166-273 (E 21 B 43/22) appl.
02.08.76 Ns 710$43, published 26.07.77 INVENTION FORMULA
Composition for oil production cont 'ning liquid hydrocarbons (oil, petroleum products), surfactants, other ingre ents and water are unique due to the fact that as a hydrocarbon phase heavy asph ene-resin oil is used ( 900 kg/m3 density and over, 10% and over of asphaltene 0% and over of resin). As surfactants non-ionic substances are used - pro cts of condensation of oxide ethylene with hydrocarbon derivatives containing obile hydrogen atom (for example, fatty alcohols, acids, alkyl phenols and bl k co-polymers of ethylene and propylene oxides, etc.). As a
The invention is referred to the oil production industry and in particular to oil production compositions with the hydrocarbon and/or oil solutions base of surfactants which possess ultra low interface tension on the oil-water boundary that determines their independent ability to form stable "oil in water type" emulsions and show certain oil displacement properties at the time of injection into the reservoir.
The major disadvantage of known compositions is a short time of their effective impact when injected into the reservoir since due to adsorption of surfactants the compositions are "depleted" by the surfactant molecules which leads to the decrease in their oil displacement properties.
The objective of the invention is to create a composition that exhibits high oil displacement properties and low degree of surfactant adsorption in reservoir conditions.
To attain the stated objective the composition for oil production which consists of surfactants and the oil phase also contains a regulator - a substance which increases solubility of surfactants in the oil phase and provides colloid state of asphaltenes in oil.
As a result associates of polar asphaltene-resin oil components and surfactant molecules are formed in such a composition which decreases the number of free surfactant molecules in the composition and decreases the degree of their adsorption on the rock of the reservoir accordingly.
The percentage of components in the developed composition is as follows (% of mass):
Surfactants 15.0 - 25.0 Oil phase 50 - 70.0 Regulator 15.0 - 25.0 The product of condensation of ethylene oxide with hydrocarbon derivatives containing a mobile hydrogen atom is used as a surfactant, for instance, oxyethylene derivatives of fatty alcohols, acids, alkyl phenols and co-polymers of ethylene and propylene oxides, their trade versions such as OXY-FOS, Reapon-4B, AF, OP, Proxanol etc. are widely used as displacing, dispersion, wetting, demulsifying and other non-ionic surfactants in various industrial processes including oil production and refining.
As an oil phase merchantable oil with residual content of water and chloride salts no lower than Group III in quality (according to COST 9965-76 "Oil. Degree of Treatment for Refineries. Technical specifications") is used. To prepare the composition with mentioned surfactant component heavy oil (density of 900 kg/cm 3 and over) is used with a high content of asphaltenes and resins (not less than 10 and 30% of mass accordingly).
Light paraffin or parai~m-naphtene oils can not be applies for this purpose.
They have a weak dissolving ability for used surfactants; a comparatively low (within 1-2%
of mass) content of asphaltenes in such oils does not provide required "binding" of surfactant molecules by the colloid dispersed asphaltenes particles.
As a regulator - a substance, increasing solubility of non-ionic surfactant and impacting the colloid state of asphaltenes in the oil phase solvents are used. They have an unlimited solubility in respect to both asphaltene-resin oil components and used surfactant, for example, toluene, chloroform, tetrachloride hydrogen, nitrobenzene etc.
The method of preparation of the composition for oil production consists initially of an operation of surfactant and regulator blending (solution), the ratio being 1:1 (mass). Next, constantly mixing the system, 30 - 50% (mass) of the resulting solution is added to heavy, asphaltene-resin oil.
A known composition for oil production exists [Holm Le Roy W. "Soluble oil composition., Union Oil Co of California, US Patent, 252-8.55 D,E 21b 43/16, Ns3691072] called "soluble oil" (PH), which contains (% of volume): 45-90% of liquid hydrocarbons (oil, petroleum products with density of 0.75-0.85 g/m3);
4-10% of surfactants (alkylarylsulphonates which in their composition contain an alkyl chain of 10-20 carbon atoms); 0.5 - 8% of a polar solvent (secondary butyl alcohol) and 0.15% of a univalent cation salt (NaCI,KCL). Contacting water up to 40"/0 (volume) of water in the composition can "dissolve" as a micro emulsion, 'water in oil" type. With a high water content phase inversion takes place forming an "oil in water" micro emulsions.
Such micro emulsions known under the name of Maraflood or micellar dispersions have high oil displacement properties. The largest project of injecting such micro emulsion into Robinson sandstone in Illinois, undertaken by Marathon in the US [1] allows to extract 40 e3m3 of oil. However, complications in preparation of such a composition in field conditions and a high cost of conducting these treatments first of all due to high losses of surfactant in the reservoir as a result of their adsorption made the company look for more economical compositions.
Proposed composition for oil production unlike the prototype contains a smaller number of ingredients that are easier to prepare. The composition forms a more stable (kinetically and aggregately) "oil in water" type micro emulsion and as a result of slowed adsorption surfactant on the rock possesses a higher oil displacement property which makes it more economical.
The following examples illustrate the properties of proposed composition and prototype composition.
To prepare proposed compositions oxiethylene_products were selected as surfactants (non-ionic surfactants): OXIFOS, OZI~, OC-20, AF-12 and OP-10 with concentration within 15-20% (mass); 50% of oil phase (heavy merchantable oil, 950 kg/m3 in density, containing 11.2% of asphaltenes, 37.8% of resin, 2.1% of parai~m and no more than 1%
of water) and 15-25% (mass) of regulator-solvent (CCL4).
The prototype compositions were prepared with merchantable oil (850-kg/m density, 1.7% asphaltenes, 15.9% of resin, 2.8% of paraffin); 4 - 30% of anion active surfactant -alkylarylsulphonate - AACN - with molecular mass of 520; 0.5 - 8% of polar solvent (secondary butyl alcohol). As a salt of univalent ration NaCI was used which was introduced into the composition as a 0.3% water solution, total volume of which in the system was $0% (mass).
The method of preparation for the prototype composition was as follows: an anion surfactant was dissolved first in a polar solvent, the resulting solution was blended with the oil phase at such a ratio that the surfactant content in the oil solution would vary within 4 - 30% (mass). Later 1:1 (mass) 0.3% water based NaCI solution was added to the resulted HP.
To compare the properties of formed micro emulsions 1:1 (mass) 0.3% water based NaCI
solution was also added to the proposed composition.
Table 1 contains information on the ingredients content. Table 2 contains general physical and chemical properties of the proposed composition and the prototype composition.
One can see from Table 2 that oil displacement properties of the developed composition are considerably (several times) higher than similar properties of the prototype composition. However, developed compositions with the minimum surfactant content ( 1$% mass) turned out close (equal) in efficiency to the prototype composition where the surfactant content equals 30% mass, which is the maximum number. Based on this the lower limit of non-ionic surfactant content in the developed composition is 1$% of mass and as a top limit we accepted surfactant concentration within 2$% of mass for economic reasons.
The content of regulator-solvent in the developed composition of 1$-2$% of mass allows not only to effectively dissolve the surfactant initially in the regulator but also provide required colloid dispersion (close to molecular) state of asphaltene-resin components in oil which assists the formation of associates from surfactant molecules and polar oil components and slowers surfactant adsorption i.e. allows to wash a larger oil volume from the pore volume of the reservoir with the same composition volume.
The technology of application of developed oil production composition is simple and is not much different from known [2] Maraflood technology (micellar dispersions application).
Table 1 # Composition- In clients, %
of mass Surfactant Oil Solvent Micro emulsion phase type numberdensity% of type numberat 50 %HZO
asphalt enes 1 Proposed Oksif 1$ 0.950 11.2 CC 15 Oil in water 2 Prototype ARCH 4 0.850 1.7 Butanol8 Oil in water 3 Proposed Oksif 2$ 0.950 11.2 CC14 25 Oil in water 4 Prototype ARCH 3 Q 0.850 1.7 Butanol8 Oil in water Proposed OJK 1$ 0.950 11.2 CC 15 Oil in water 6 Proposed OJK 2$ 0.950 11.2 CC14 25 Oil in water 7 Proposed OC-20 1$ 0.950 11.2 CC 15 Oil in water 8 Proposed OC-20 2$ 0.950 11.2 CC14 25 Oil in water 9 Proposed AF-12 1$ 0.950 11.2 CC14 15 Oil in water Proposed AF-12 2$ 0.950 11.2 CC14 25 Oil in water 11 Proposed OP-10 1$ 0.950 11.2 CC14 15 Oil in water 12 Proposed OP-10 2$ 0.950 11.2 CC14 25 Oil in water Table 2 # CompositionCom sition meters _Micro emulsioneters 50% H20 Relative Viscosity, Viscosity, 100% displacement weight 20C
(~m3) MPa-s 20C MPa-s property, pore volume/solution volume 1 Pro sed 1055 170.0 10.7 Not less than 2 Proto 860 36.0 28.9 About 1 3 Pro 1075 47.7 8.5 Not less than 4 Proto 890 49.4 68.6 About 7 5 Pro sed 1060 180.7 12.8 About 8 6 sed 1075 45.0 9.5 Not less than 7 Pro sed 1065 180.9 12.6 About 8 8 Pr sed 1080 56.0 11.8 Not less than 9 Pro sed 1070 175.7 10.5 Around 7 10 Pro sed 1085 64.3 9.6 Not less than 11 Pro sed 1067 154.9 11.5 Around 8 12 X 1087 57.7 10.1 Not less than References:
1. Gogarthy M.B. Surfactant. "Oil and Gas J." 1977 Ns35, 253, 256, 258 Secondary oil recovery [Marathon Oil Co], Patent N1 MKI E 21 B 43/22 Ns 13$084 published 1$.09.72 2. Holm LeRoy W. Micellar flooding process for recovering oil from petroleum reserving.
[Union Oil Co. Of California] US Patent NKI 166-273 (E 21 B 43/22) appl.
02.08.76 Ns 710$43, published 26.07.77 INVENTION FORMULA
Composition for oil production cont 'ning liquid hydrocarbons (oil, petroleum products), surfactants, other ingre ents and water are unique due to the fact that as a hydrocarbon phase heavy asph ene-resin oil is used ( 900 kg/m3 density and over, 10% and over of asphaltene 0% and over of resin). As surfactants non-ionic substances are used - pro cts of condensation of oxide ethylene with hydrocarbon derivatives containing obile hydrogen atom (for example, fatty alcohols, acids, alkyl phenols and bl k co-polymers of ethylene and propylene oxides, etc.). As a
Claims (2)
1. Composition for oil production containing liquid hydrocarbons (oil, petroleum products), surfactants, other ingredients and water are unique due to the fact that as a hydrocarbon phase heavy asphaltene-resin oil is used (900 kg/m3 density and over, 10% and over of asphaltene, 30% and over of resin). As surfactants non-ionic substances are used - products of condensation of oxide ethylene with hydrocarbon derivatives containing mobile hydrogen atom (for example, fatty alcohols, acids, alkyl phenols and block co-polymers of ethylene and propylene oxides, etc.).
As a regulator increasing solubility of non-ionic surfactants and asphaltene-resin oil component solvents are used such as toluene, tetrachloride carbon, chloroform, nitrobenzene and others) with the following mass percentage:
Non-ionic surfactants 5-25 Oil phase ~~50-70 Regulator ~~15-25
As a regulator increasing solubility of non-ionic surfactants and asphaltene-resin oil component solvents are used such as toluene, tetrachloride carbon, chloroform, nitrobenzene and others) with the following mass percentage:
Non-ionic surfactants 5-25 Oil phase ~~50-70 Regulator ~~15-25
2. Composition for oil production according to paragraph 1 is unique due to the fact that to simplify the technology and equipment for preparing the composition with simultaneous effective blending of used components initially blending (dissolving) of surfactant and regulator in 1:1 ratio (mass) takes place after which with constant mixing the resulted solution is introduced into heavy asphaltene-resin oil at the same 1:1 ratio (mass)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/RU1998/000425 WO2000037774A1 (en) | 1998-12-21 | 1998-12-21 | Composition for eor and method of its preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2279874A1 true CA2279874A1 (en) | 2000-06-21 |
Family
ID=20130307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002279874A Abandoned CA2279874A1 (en) | 1998-12-21 | 1998-12-21 | Oil production composition and its preparation method |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2279874A1 (en) |
| WO (1) | WO2000037774A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8256511B2 (en) | 2007-07-24 | 2012-09-04 | Exxonmobil Upstream Research Company | Use of a heavy petroleum fraction as a drive fluid in the recovery of hydrocarbons from a subterranean formation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701156B (en) * | 2017-08-25 | 2020-07-21 | 中国石油化工股份有限公司 | Method for single-well huff and puff oil recovery by utilizing microbial polysaccharide system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691072A (en) * | 1969-12-31 | 1972-09-12 | Union Oil Co | Soluble oil composition |
| US3951828A (en) * | 1973-11-29 | 1976-04-20 | Marathon Oil Company | Process of injecting a micellar dispersion into a subterranean reservoir |
| MX156325A (en) * | 1981-05-20 | 1988-08-10 | Mexicano Inst Petrol | AN IMPROVED REVERSE EMULSION OF BALANCED ACTIVITY TO INHIBIT THE HYDRATION OF DELEZNABLE PASSES IN OIL WELLS |
| SU1078034A1 (en) * | 1982-03-10 | 1984-03-07 | Всесоюзный Научно-Исследовательский И Проектный Институт Нефтепромысловой Химии Научно-Производственного Объединения "Союзнефтепромхим" | Water-hydrocarbon emulsion for recovering residual oil |
| RU2068952C1 (en) * | 1990-11-26 | 1996-11-10 | Научно-производственное объединение по химизации технологических процессов в нефтяной промышленности | Method of affecting critical zone of nonuniformly permeable oil stratum |
| RU2034981C1 (en) * | 1992-10-15 | 1995-05-10 | Всероссийский нефтегазовый научно-исследовательский институт | Method of exploitation of oil pool |
-
1998
- 1998-12-21 WO PCT/RU1998/000425 patent/WO2000037774A1/en unknown
- 1998-12-21 CA CA002279874A patent/CA2279874A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8256511B2 (en) | 2007-07-24 | 2012-09-04 | Exxonmobil Upstream Research Company | Use of a heavy petroleum fraction as a drive fluid in the recovery of hydrocarbons from a subterranean formation |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000037774A1 (en) | 2000-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |