CN101737025A - Method for reducing viscosity of crude oil - Google Patents
Method for reducing viscosity of crude oil Download PDFInfo
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- CN101737025A CN101737025A CN 200810226921 CN200810226921A CN101737025A CN 101737025 A CN101737025 A CN 101737025A CN 200810226921 CN200810226921 CN 200810226921 CN 200810226921 A CN200810226921 A CN 200810226921A CN 101737025 A CN101737025 A CN 101737025A
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Abstract
The invention provides a method for reducing the viscosity of crude oil, which comprises the following steps: injecting water into the crude oil and adding a catalyst and an oxidant, then mixing the mixture evenly. By oxidating a part of the crude oil by a catalytic oxidation method, the method reduces the relative molecular mass of the crude oil, thereby reducing the viscosity of the crude oil, ensuring that the crude oil is easy to be displaced, and further increasing the recovery ratio.
Description
Technical field
The present invention relates to a kind of method that reduces viscosity of crude, especially a kind of viscosity, thereby the method for raising oil recovery factor by catalytic oxidation reduction crude oil.
Background technology
The discovery of the oil oil recovery technique that arisen at the historic moment, the imbalance between supply and demand of oil has promoted the development of oil recovery technique.From relying on natural energy to carry out on the basis of primary oil recovery technology, develop the secondary oil recovery technology that water filling, gas injection, make oil recovery factor obtain raising to a certain degree.Yet after the secondary oil recovery, remaining viscosity of crude is big in the oil reservoir, be adsorbed in the crack, hole on sandstone particle hole or stratum, only be difficult to be come out by displacement by water filling, gas injection, and this part crude oil accounts for 60%～70% of original oil in place, therefore need the new oil recovery technique of exploitation, i.e. tertiary oil recovery technology is with further raising oil recovery factor.At present, tertiary oil recovery technology mainly comprises chemical method, mixed phase method, heating power method and microbial method etc., also has additive method in addition, for example:
CN 1456787A proposes a kind of chemical heat exploitation method that is used for heavy crude producing, will be by H
2O
2Oxidation system reagent made from thickening agent (polyacrylamide) and the reduction system reagent of being made by hydrazine and thickening agent inject the stratum.Utilize the heat of their chemical reaction generations in the stratum, make reducing thick oil viscosity; Simultaneously, the gas of generation plays the effect of gas drive, thereby improves the recovery ratio of viscous crude.This method is still a kind of of oil recovery by heating in fact, and is this by improving the method that temperature reduces viscosity of thickened oil, little for the crude oil effect preferably of sticking warm nature, makes that its application is narrower.
US 2007/0235187A1 proposes the method that a kind of low-temperature oxidation improves oil recovery factor, utilizes air or oxygen to be oxidant, is catalyzer with platinum, palladium, rhodium, ruthenium, manganese etc., makes the mink cell focus partial combustion generate light oil, reduces its viscosity; Make light oil completing combustion generate CO
2, for gas, improved the recovery ratio of crude oil as gas drive.This method still needs external heat source, and selects noble metal catalyst for use, has increased running cost, makes possibility of its application reduce.
CN 132762A proposes a kind of nm-membrane oil-displacing technique that oil field development improves recovery ratio that is used for, by injecting the nanometer film agent solution to injecting well, in oil reservoir, produce absorption, change wetability, diffusion and capillary tube, reach the purpose of improving oil displacement efficiency, improving oil recovery from the imbibition effect.This technology need not to add other chemical agents, and early investment is few, and displacement technology is simple.But how guaranteeing the stability of nanoscale monofilm, is the key issue of promoting this technical matters.
CN 1609405A proposes a kind of ultrasonic wave flooding method, is medium with the liquid in shaft bottom, utilizes the supersonic generator in the oil well to send ultrasonic wave, medium is vibrated, to the oil reservoir washing of vibrating, make and hide oil and separate out by medium, then gather, improve recovery ratio.But this method need be set up supersonic generator, has increased investment and operation expense, and difficult realization is applied.
Summary of the invention
The invention provides a kind of method that reduces viscosity of crude, utilize catalytic oxidation that crude oil is carried out partial oxidation, reduce its relative molecular mass, thereby reduce the viscosity of crude oil, it is easy to by displacement, and then improve recovery ratio.
The present invention also provides a kind of oil extraction method.
The method of reduction viscosity of crude provided by the invention comprises: inject water in crude oil, add catalyzer and oxidant, mix.
In order to make the crude oil sufficient reacting, in water filling crude oil, add a kind of in catalyzer and the oxidant earlier, after mixing, add another kind ofly again, mix again.
The pH of water filling is between 2.5～7.5 in the crude oil, and preferred 4.0～6.0.
Said oxidant can be a kind of in hydrogen peroxide, clorox, postassium hypochlorite, chlorine dioxide and the ozone, preferred hydrogen peroxide.Oxidant add quality be water filling in the crude oil quality 10/1000000ths to 1000/1000000ths, be preferably 500/50/1000000ths to 1000000ths.
Said catalyzer can be selected from the metal ion of I B, IIB, VIB, VIIB and VIII family or be selected from MnO
2, TiO
2And Al
2O
2A kind of in the metal oxide, preferred Fe
2+, Fe
3+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Gu
2+, Ag
+, Cr
3+And Zn
2+In a kind of, preferred especially Fe
2+Fe
2+Catalyzer can be by being selected from FeSO
4, FeCl
2, Fe (NO
3)
2, Fe
3(PO
4)
2, ferrous oxalate and ferrous citrate etc. molysite preferred FeSO is provided
4And FeCl
2The amount of substance of catalyzer and oxidant compares between 0.1～10.0, and preferred 0.5～2.0.
Oil extraction method provided by the invention, comprise above-mentioned aqueous catalyst solution and aqueous oxidizing agent solution are injected reservoir formation according to described addition with oil-extracting and water-injecting, with the crude oil generation oxidation reaction that sticks to the rock seam surface, macromolecular components in the crude oil is diminished, thereby improve oil recovery factor.
Catalyzer and oxidant inject crude oil with oil-extracting and water-injecting, in order to make the crude oil sufficient reacting, the oil-extracting and water-injecting (or aqueous catalyst solution) that contains catalyzer can be added, after mixing earlier in crude oil, add the oil-extracting and water-injecting (or aqueous oxidizing agent solution) that contains oxidant again, mix again.
Said oil-extracting and water-injecting can be secondary or tertiary oil recovery water filling.
The present invention has following advantage:
1), can significantly reduce macromolecular relative molecular mass in the crude oil, thereby reduce viscosity of crude, it is easy to by displacement, and then improves recovery ratio;
2), condition relaxes, easy to operate, investment and operating cost are low;
3), be widely used in various types of oil reservoirs.
The specific embodiment
The present invention will be further described in detail below in conjunction with embodiment, the scope that the claimed scope of the present invention is represented including, but not limited to embodiment.
The viscosity of crude assay method is capillary viscometer method (GB265-88).
The relative molecular mass assay method is a vapor-pressure osmometry.
Embodiment 1
Get a certain kinematic viscosity (50 ℃) and be 722.6mm
2The crude oil 20g of/s and pH be 5.5 water 180g in there-necked flask, start magnetic stirring apparatus, be the FeSO of 50g/L with 4.OmL concentration
4The aqueous solution joins there-necked flask, and adding concentration behind the 5min is 90g/L hydrogen peroxide solution 1.0ml, stops to stir behind the reaction 4h down at 50 ℃, leaves standstill and carries out water-oil separating, gets upper strata crude oil and measures viscosity, and viscosity is 584.4mm
2/ s, viscosity break ratio is 19.1%.
Embodiment 2
Get a certain kinematic viscosity (50 ℃) and be 1164.0mm
2The crude oil 20g of/s and pH be 4.0 water 180g in there-necked flask, start magnetic stirring apparatus, be the Fe (NO of 40g/L with 4.0mL concentration
3)
2The aqueous solution joins there-necked flask, and adding 1.0mL concentration behind the 5min is the postassium hypochlorite solution of 54g/L, stops to stir behind the reaction 6h down at 80 ℃, leaves standstill and carries out water-oil separating, gets upper strata crude oil and measures viscosity, and viscosity is 907.9mm
2/ s, viscosity break ratio is 22.0%.
Embodiment 3
Get a certain kinematic viscosity (50 ℃) and be 186.6mm
2The crude oil 20g of/s and pH be 6.0 water 180g in there-necked flask, start magnetic stirring apparatus, be the FeSO of 36g/L with 1.0mL concentration
4The aqueous solution joins there-necked flask, adds the liquor natrii hypochloritis that 1.0mL concentration is 18g/L behind the 5min, at room temperature reacts to stop behind the 2h stirring, and leaves standstill and carries out water-oil separating, gets upper strata crude oil and measures viscosity, and viscosity is 152.4mm
2/ s, viscosity break ratio is 17.8%.
Embodiment 4
Getting a certain average molecular mass and be 836.0 crude oil 20g and pH and be 6.0 water 180g in there-necked flask, start magnetic stirring apparatus, is the Fe (NO of 40g/L with 4.0mL concentration
3)
2The aqueous solution joins there-necked flask, adds the liquor natrii hypochloritis that 1.0mL concentration is 70g/L behind the 5min, stops to stir behind the reaction 3h down at 70 ℃, leaves standstill and carries out water-oil separating, gets upper strata crude oil and measures relative molecular mass, and the result is as shown in table 1.As can be seen from Table 1, relative molecular mass reduces to 20.0% greater than 1000 constituent content by 24.4%, and relative molecular mass is increased to 24.3% less than 500 constituent content by 19.4%, and average molecular mass is 778.5, has reduced by 6.9%.
Crude oil relative molecular mass changes in distribution before and after table 1 catalytic oxidation is handled
Embodiment 5
Get a certain average molecular mass and be 728.0 crude oil 20g and pH and be 6.0 water 180g in there-necked flask, start magnetic stirring apparatus, with 2.0mL concentration is that the FeSO4 aqueous solution of 60g/L joins there-necked flask, adding 1.0mL concentration behind the 5min is the postassium hypochlorite solution of 36g/L, stop to stir behind the reaction 3h down at 40 ℃, leave standstill and carry out water-oil separating, get upper strata crude oil and measure relative molecular mass, the result is as shown in table 2.As can be seen from Table 2, relative molecular mass reduces to 10.8% greater than 1000 constituent content by 13.6%, and relative molecular mass is increased to 31.5% less than 500 constituent content by 24.8%, and average molecular mass is 673.5, has reduced by 7.5%.
Crude oil relative molecular mass changes in distribution before and after table 2 catalytic oxidation is handled
Embodiment 6
Getting a certain average molecular mass and be 464.8 crude oil 20g and pH and be 6.0 water 180g in there-necked flask, start magnetic stirring apparatus, is the Fe (NO of 30g/L with 1.0mL concentration
3)
2The aqueous solution joins there-necked flask, adds the hydrogen peroxide solution that 1.0mL concentration is 9g/L behind the 5min, at room temperature reacts to stop behind the 5h stirring, and leaves standstill and carries out water-oil separating, gets upper strata crude oil and measures relative molecular mass, and the result is as shown in table 3.As can be seen from Table 3, relative molecular mass reduces to 1.6% greater than 1000 constituent content by 4.7%, and relative molecular mass is increased to 69.3% less than 500 constituent content by 64.1%, and average molecular mass is 415.5, has reduced by 10.6%.
Crude oil relative molecular mass changes in distribution before and after table 3 catalytic oxidation is handled
Claims (14)
1. a method that reduces viscosity of crude comprises: inject water in crude oil, add catalyzer and oxidant, mix.
2. in accordance with the method for claim 1, it is characterized in that the pH of water filling is between 2.5～7.5 in the crude oil.
3. in accordance with the method for claim 1, it is characterized in that said oxidant is a kind of in hydrogen peroxide, clorox, postassium hypochlorite, chlorine dioxide and the ozone.
4. in accordance with the method for claim 1, it is characterized in that, the dosage of oxidant be in the crude oil water filling quality 10/1000000ths to 1000/1000000ths.
5. in accordance with the method for claim 1, it is characterized in that, the dosage of oxidant be in the crude oil water filling quality 500/50/1000000ths to 1000000ths.
6. in accordance with the method for claim 1, it is characterized in that said catalyzer is selected from the metal ion of IB, IIB, VIB, VIIB and VIII family or is selected from MnO
2, TiO
2And Al
2O
3A kind of in the metal oxide.
7. in accordance with the method for claim 1, it is characterized in that said catalyzer is selected from Fe
2+, Fe
3+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Cu
2+, Ag
+, Cr
3+And Zn
2+In a kind of.
8. in accordance with the method for claim 1, it is characterized in that catalyzer is 0.1～10.0 with the ratio of the amount of substance of oxidant.
9. in accordance with the method for claim 1, it is characterized in that catalyzer is 0.5～2.0 with the ratio of the amount of substance of oxidant.
10. the method for an oil extraction comprises the aqueous oxidizing agent solution aqueous catalyst solution is injected reservoir formation with oil-extracting and water-injecting, with the crude oil generation oxidation reaction that sticks to the rock seam surface.
11. in accordance with the method for claim 10, it is characterized in that said oil-extracting and water-injecting is secondary or tertiary oil recovery water filling.
12. in accordance with the method for claim 10, it is characterized in that said oxidant is a kind of in hydrogen peroxide, clorox, postassium hypochlorite, chlorine dioxide and the ozone.
13. in accordance with the method for claim 10, it is characterized in that said catalyzer is selected from the metal ion of IB, IIB, VIB, VIIB and VIII family or is selected from MnO
2, TiO
2And Al
2O
3A kind of in the metal oxide.
14. in accordance with the method for claim 10, it is characterized in that said catalyzer is selected from Fe
2+, Fe
3+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Cu
2+, Ag
+, Cr
3+And Zn
2+In a kind of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810226921 CN101737025B (en) | 2008-11-20 | 2008-11-20 | Method for reducing viscosity of crude oil |
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|---|---|---|---|
| CN 200810226921 CN101737025B (en) | 2008-11-20 | 2008-11-20 | Method for reducing viscosity of crude oil |
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| CN101737025B CN101737025B (en) | 2013-04-24 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162351A (en) * | 2011-03-15 | 2011-08-24 | 彭仁田 | Application of hydrogen peroxide to thickened oil dilution |
| CN103314179A (en) * | 2010-12-21 | 2013-09-18 | 雪佛龙美国公司 | System and method for enhancing oil recovery from a subterranean reservoir |
| CN103421484A (en) * | 2013-08-27 | 2013-12-04 | 陕西科技大学 | Double-component aqueous fracturing fluid gel breaker and application method thereof |
| CN103883296A (en) * | 2013-12-20 | 2014-06-25 | 彭仁田 | Oxygen removal method for diluting heavy oil by injecting hydrogen peroxide |
| CN103883297A (en) * | 2013-12-20 | 2014-06-25 | 彭仁田 | Method for injecting hydrogen peroxide to dilute thickened oil by using aluminum oxide as catalyst |
| CN104927831A (en) * | 2015-06-25 | 2015-09-23 | 陕西科技大学 | Gel breaker with high-efficiency positioning double-effect and preparation method thereof |
| CN108468537A (en) * | 2017-02-23 | 2018-08-31 | 克拉玛依市建辉油田技术服务有限公司 | Chemical energization realizes underground viscous crude visbreaking mining novel technology |
Family Cites Families (5)
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| CN100363456C (en) * | 2004-11-17 | 2008-01-23 | 中国石油化工股份有限公司 | Inspissated oil emulsion viscidity reducer |
| CN1915488A (en) * | 2005-08-16 | 2007-02-21 | 上海三瑞化学有限公司 | Catalyst in use for reducing viscosity in hydrothermal cracking and catalyzing thick oil underground well |
| CN100391601C (en) * | 2006-05-11 | 2008-06-04 | 上海三瑞化学有限公司 | Catalyst for downhole catalytic reforming of viscous crude |
| CN100497884C (en) * | 2006-12-07 | 2009-06-10 | 西南石油大学 | Method for producing oil by injecting air buffering catalytic oxidation of thick oil |
| CN100467394C (en) * | 2007-03-19 | 2009-03-11 | 大庆石油学院 | Method for removing polyacrylamide and other organic matters in oilfield exploration water and electrochemical reactor |
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2008
- 2008-11-20 CN CN 200810226921 patent/CN101737025B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103314179A (en) * | 2010-12-21 | 2013-09-18 | 雪佛龙美国公司 | System and method for enhancing oil recovery from a subterranean reservoir |
| CN102162351A (en) * | 2011-03-15 | 2011-08-24 | 彭仁田 | Application of hydrogen peroxide to thickened oil dilution |
| CN103421484A (en) * | 2013-08-27 | 2013-12-04 | 陕西科技大学 | Double-component aqueous fracturing fluid gel breaker and application method thereof |
| CN103421484B (en) * | 2013-08-27 | 2016-01-20 | 陕西科技大学 | A kind of two component aqueous fracturing fluid gel breaker and using method thereof |
| CN103883296A (en) * | 2013-12-20 | 2014-06-25 | 彭仁田 | Oxygen removal method for diluting heavy oil by injecting hydrogen peroxide |
| CN103883297A (en) * | 2013-12-20 | 2014-06-25 | 彭仁田 | Method for injecting hydrogen peroxide to dilute thickened oil by using aluminum oxide as catalyst |
| CN104927831A (en) * | 2015-06-25 | 2015-09-23 | 陕西科技大学 | Gel breaker with high-efficiency positioning double-effect and preparation method thereof |
| CN108468537A (en) * | 2017-02-23 | 2018-08-31 | 克拉玛依市建辉油田技术服务有限公司 | Chemical energization realizes underground viscous crude visbreaking mining novel technology |
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|---|---|
| CN101737025B (en) | 2013-04-24 |
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