CN103048223A - Method for testing influence of alkali on thickened oil viscosity reducing effect - Google Patents
Method for testing influence of alkali on thickened oil viscosity reducing effect Download PDFInfo
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- CN103048223A CN103048223A CN 201110325867 CN201110325867A CN103048223A CN 103048223 A CN103048223 A CN 103048223A CN 201110325867 CN201110325867 CN 201110325867 CN 201110325867 A CN201110325867 A CN 201110325867A CN 103048223 A CN103048223 A CN 103048223A
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Abstract
The invention discloses a method for testing influence of alkali on a thickened oil viscosity reducing effect. The method comprises the steps of: (a) preparing alkali solutions of different concentrations; (b) extracting a thickened oil emulsion; (c) mixing thickened oil with distilled water according to a certain proportion; (d) putting a mixture of the thickened oil and the distilled water in a super thermostatic water bath to still; and (e) measuring the viscosity of the mixture, and analyzing the influence of the content of the alkali solutions on the viscosity reducing ratio of the thickened oil. The method can rapidly test the influence of the alkali on the viscosity reducing effect of the thickened oil, and has the advantages of high test precision and low test cost. The method provides data support for the exploitation of the thickened oil.
Description
Technical field
The present invention relates to a kind of alkali to the method for testing of the viscosity reducing effect impact of viscous crude.
Background technology
Powerful in petroleum demand, price of oil going up sky-high, under the background of conventional Heavy Oil production declining, petroleum industry is just turning to thickened oil recovery at the emphasis in many places, the whole world.The chances are 9～13,000,000,000,000 barrels (1.4～2.1 tcms) for the Global Oil resource,
Conventional Heavy Oil only account for wherein 30%, all the other all are viscous crude, super viscous crude and pitch.Viscous crude and tar sand resource are important energy source in the world, and approximately 4,000 hundred million tons of present global workable reserve are 2.7 times of 1,500 hundred million tons of conventional Heavy Oil workable reserve.
Along with Gong the utilization of conventional oil reduces day by day, heavy oil is becoming the next century mankind's important energy source.Through the effort in more than 20 years, global heavy oil industry had than conventional oil speed of development faster, and the annual production of viscous crude, tar sand rises to nearly hundred million tons by 2,000 ten thousand tons, and its importance receives people's concern day by day.The difficulty of heavy crude reservoir exploitation is mainly manifested in two aspects: the viscosity of viscous crude is high on the one hand, and the filtrational resistance of viscous crude in oil reservoir is large, so that viscous crude can not flow into the shaft bottom from oil reservoir; Even on the other hand under reservoir condition, viscous crude can flow into the shaft bottom, but in the process of vertical lifting, because the impact of viscous crude factor such as degassed and radiating and cooling in pit shaft, so that the viscosity of viscous crude further increases, have a strong impact on the normal operation of the mobile and oil well production equipment of resident fluid in pit shaft.
According to the interrelated data statistics, explored heavy oil resource mainly concentrates on the states such as Venezuela, USSR (Union of Soviet Socialist Republics), the U.S. and Canada in the world at present.The Orinoco heavy oil belt of Venezuela northeast is examined geologic reserve and is reached more than 3,000 hundred million tons.Half of U.S.'s heavy oil resource is distributed in Gary Fu Niya, nearly 40,000,000,000 tons of geologic reserve, remaining half be distributed in the continent, middle part.Canadian heavy oil resource mainly is distributed in four major sedimentary mineral reserve such as Athabasca, cold air lake, dimension Pascal and this river of Alberta, nearly 1,500 hundred million tons of geologic reserve.The heavy oil resource of USSR (Union of Soviet Socialist Republics) mainly is distributed in more than 200 hundred million tons of the Ba Sainuofuyue in West Siberia basin, comprises that also there is extremely abundant viscous crude resource in other country of China.Total geologic reserve of these heavy oil resources adds up more than 6,000 hundred million tons, and in the world conventional oil verify 3,600 hundred million tons of geologic reserve, its workable reserve only is 90,000,000,000 tons.
The viscous crude stock number that China has found is also very abundant, and oneself has more than 20 the viscous crude field of discovery, is distributed in the areas such as the Liaohe River, triumph, Xinjiang, huge port, Jilin, estimates that Chinese heavy petroleum asphalt stock number can reach more than 300 * 108t.China's viscous crude (highly viscous oil, viscosity is more than 0.1Pas) resource distribution is very wide, and geologic reserve reaches 164 * 108t, and wherein the land viscous crude accounts for more than 20% of oil total resources.The outstanding characteristics of viscous crude are that bituminous matter, gum level are higher.Colloid, the heavy oil production that asphalt content is higher account for 7% of viscous crude total production.
Connect the area in Daqing oil field, Henan, Inner Mongol two in recent years and found important heavy crude reservoir; Also find the viscous crude resource in areas such as Jianghan Oil-field, little, the Northwest Sichuan of peace.Heavy crude reservoir geologic reserve explored and control has surpassed national common thin oil reserves, estimates also to have from now on new growth.
In the proven reserves of CNPC, common heavy oil accounts for 74.7%, and special viscous crude accounts for 14.4%, and super viscous crude accounts for 10.9%.
Countries in the world mainly rely on traditional thermal methods to the exploitation of high viscosity heavy oil at present, i.e. steam stimulation and steam flood.The supporting technology that China's great majority adopt steam stimulation and pit shaft to mix thin oil is recovered the oil.This method not only consumes a large amount of fuel, but also consumes a large amount of thin oils, thereby has increased widely cost for oil production.Have bibliographical information can use the Emulsifying heavy crude producing, this method is that water phase surfactant mixture is annotated the down-hole, makes full-bodied viscous crude change low viscous water external emulsion extraction into.Reducing viscosity by emulsifying is because its viscosity break ratio is high, cost is low, easy operating, and at home and abroad all there is use in the oil field at present.But the emulsifying pour depressor that uses at present only possesses single heatproof or anti-rock salt performance, namely heatproof again the emulsifying pour depressor of anti-rock salt research and development also seldom.
Owing to containing carboxylic acid, naphthenic acid, carboxyl phenol, porphyrin, bituminous matter etc. in the crude oil, it is conventionally believed that, the reaction in alkali and the crude oil between some component can form surfactant, under this emulsifying agent effect, viscous crude and water form O/W type emulsion fluid, significantly viscosity reduction.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the method of testing of alkali on the viscosity reducing effect impact of viscous crude is provided, this method of testing can test out alkali fast on the impact of the viscosity reducing effect of viscous crude, and measuring accuracy is high, testing cost is low, for the exploitation of viscous crude provides Data support.
Purpose of the present invention is achieved through the following technical solutions: alkali may further comprise the steps the method for testing of the viscosity reducing effect impact of viscous crude:
(a) alkaline solution of preparation variable concentrations;
(b) extract viscous oil emulsion;
(c) viscous crude is mixed according to a certain percentage with distilled water;
(d) put into thermostatic water-circulator bath and leave standstill, and add alkaline solution;
(e) measure its viscosity, investigate the content of alkaline solution to the impact of reducing thick oil viscosity rate.
In the described step (a), alkaline solution is sodium hydroxide solution.
In the described step (c), the blending ratio of viscous crude and distilled water is 7: 3.
In the described step (d), the temperature of thermostatic water-circulator bath is 50 ℃.
In sum, the invention has the beneficial effects as follows: can test out fast alkali to the impact of the viscosity reducing effect of viscous crude, and measuring accuracy is high, testing cost is low, for the exploitation of viscous crude provides Data support.
Description of drawings
Fig. 1 is alkali content on the schematic diagram that affects of the viscosity reducing effect of viscous crude.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
The alkali that the present embodiment relates to may further comprise the steps the method for testing of the viscosity reducing effect impact of viscous crude:
(a) alkaline solution of preparation variable concentrations;
(b) extract viscous oil emulsion;
(c) viscous crude is mixed according to a certain percentage with distilled water;
(d) put into thermostatic water-circulator bath and leave standstill, and add alkaline solution;
(e) measure its viscosity, investigate the content of alkaline solution to the impact of reducing thick oil viscosity rate.
In the described step (a), alkaline solution is sodium hydroxide solution.
In the described step (c), the blending ratio of viscous crude and distilled water is 7: 3.
In the described step (d), the temperature of thermostatic water-circulator bath is 50 ℃.
The result who is recorded by said method as shown in Figure 1, as shown in Figure 1: when NaOH content is less than 0.05wt% in the viscous crude, increase with NaOH content, viscosity of thickened oil descends more, viscosity break ratio increases very fast, and when NaOH content was 0.05wt%, the reducing thick oil viscosity rate was the highest by approximately 80%; When NaOH content during greater than 0.05wt%, viscosity of thickened oil rises on the contrary, and viscosity break ratio descends.
When adding alkali number less than 0.02wt%, only have the natural carboxylic acid of minute quantity to be converted into carboxylate and be adsorbed on water-oil interface, major part not saponification carboxylic acid still is present in the oil phase, and this moment, viscous crude the oil mixing with water system can not occur to the transformation of O/W type emulsion, this moment, system viscosity was higher, and viscosity break ratio is lower; When adding alkali number and be 0.05wt%, part natural carboxylic acid's saponification is carboxylate, and saponification carboxylic acid and saponification carboxylate form the mixing and absorption film at water-oil interface.Because the water wettability of carboxylate is greater than lipophilicity, the oil mixing with water system is converted into O/W type emulsion.Crude oil obtains sufficient emulsification, and emulsion fluid viscosity ratio viscosity of thickened oil descends rapidly; Too high when adding alkali number, during for 0.08wt%, the whole saponification of all natural carboxylic acids are carboxylate.Because the repulsive interaction of carboxylate anion's head, the interface of Interfacial Adsorption film is pressed lower, and interfacial tension is high, the bituminous matter aggregation can not be replaced from the interface, and viscous crude can't be realized phase inversion, and viscosity increases on the contrary, and viscosity break ratio reduces
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and every foundation technical spirit of the present invention, any simple modification, equivalent variations to above embodiment does all fall within protection scope of the present invention.
Claims (4)
1. alkali is characterized in that the method for testing of the viscosity reducing effect impact of viscous crude, may further comprise the steps:
(a) alkaline solution of preparation variable concentrations;
(b) extract viscous oil emulsion;
(c) viscous crude is mixed according to a certain percentage with distilled water;
(d) put into thermostatic water-circulator bath and leave standstill, and add alkaline solution;
(e) measure its viscosity, investigate the content of alkaline solution to the impact of reducing thick oil viscosity rate.
2. alkali according to claim 1 is characterized in that the method for testing of the viscosity reducing effect impact of viscous crude, and in the described step (a), alkaline solution is sodium hydroxide solution.
3. alkali according to claim 1 is characterized in that the method for testing of the viscosity reducing effect impact of viscous crude, and in the described step (c), the blending ratio of viscous crude and distilled water is 7: 3.
4. alkali according to claim 1 is characterized in that the method for testing of the viscosity reducing effect impact of viscous crude, and in the described step (d), the temperature of thermostatic water-circulator bath is 50 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110325867 CN103048223A (en) | 2011-10-13 | 2011-10-13 | Method for testing influence of alkali on thickened oil viscosity reducing effect |
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| CN 201110325867 CN103048223A (en) | 2011-10-13 | 2011-10-13 | Method for testing influence of alkali on thickened oil viscosity reducing effect |
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| CN103048223A true CN103048223A (en) | 2013-04-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706887A (en) * | 2016-12-19 | 2017-05-24 | 中国石油天然气股份有限公司 | Measuring method of solvent concentration in thickened oil |
| CN111205843A (en) * | 2019-06-18 | 2020-05-29 | 中国石油大学(北京) | Thick oil viscosity reducer, preparation method and use method thereof |
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2011
- 2011-10-13 CN CN 201110325867 patent/CN103048223A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706887A (en) * | 2016-12-19 | 2017-05-24 | 中国石油天然气股份有限公司 | Measuring method of solvent concentration in thickened oil |
| CN106706887B (en) * | 2016-12-19 | 2019-10-11 | 中国石油天然气股份有限公司 | The measurement method of solvent strength in a kind of viscous crude |
| CN111205843A (en) * | 2019-06-18 | 2020-05-29 | 中国石油大学(北京) | Thick oil viscosity reducer, preparation method and use method thereof |
| CN111205843B (en) * | 2019-06-18 | 2021-06-25 | 中国石油大学(北京) | Thick oil viscosity reducer, preparation method and use method thereof |
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Application publication date: 20130417 |