CN105223235A - A kind of water stability testing method in crude oil - Google Patents
A kind of water stability testing method in crude oil Download PDFInfo
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- CN105223235A CN105223235A CN201510586789.8A CN201510586789A CN105223235A CN 105223235 A CN105223235 A CN 105223235A CN 201510586789 A CN201510586789 A CN 201510586789A CN 105223235 A CN105223235 A CN 105223235A
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Abstract
The invention discloses a kind of water stability testing method in crude oil, be specifically related to crude oil corrosion protection technology field.It solve and adopt water cut in oil film microscopic inspection test crude oil at present, the problems such as test result and actual condition difference is large, poor reproducibility.Water stability testing method in this crude oil, specifically comprises the following steps: adopt supercentrifuge to dewater to crude oil to be measured; The crude oil to be measured of dehydration is weighed, and the crude oil to be measured of dehydration is added in test bottle; In crude oil to be measured, add deionized water, form oil-water mixture; Adopt magnetic agitation method that mixed liquor is stirred 24 hours, form stable oil-water emulsion, as test fluid; Leave standstill 24 hours, adopt ultrasonic oscillator, Simulation of Crude Oil stores and transport condition, carries out dewatering operation to test fluid; Adopt the electrical characteristics of test electrode test test bottle bottom solution, determined whether that elutriation goes out.
Description
Technical field
The invention belongs to crude oil corrosion protection technology field, be specifically related to a kind of water stability testing method in crude oil.
Background technology
The water carried in in-place oil can not remove completely by crude oil in recovery process, though band water crude oil is through pre-service such as electrical dewatering, heating sedimentations, is stripped of most of water, still has a small amount of moisture to enter outer defeated main line.Water usually exists with two kinds of forms in crude oil: the first is oil/water emulsion, and water is dispersed in crude oil with superfine little drops, forms the newborn solution that dispersion is very thin, is difficult to be separated; The second is water/oil emulsion, and water is free state or is dissolved in crude oil, is suspended in oil with water droplet form, and this part water may be separated out under certain condition from crude oil.Along with the increase of liquid water content in crude oil, the water in crude oil will be converted into oil/water emulsion by water/oil emulsion, and meanwhile, water will be separated out from crude oil, thus cause the corrosion of crude oil pipeline, also cause the decline of pipeline operation efficiency simultaneously.Crude oil pipeline conveying enterprise economically sets out, and usually requires that pipeline oil liquid water content is less than 0.5%.Due to the complicacy of crude oil composition, produce actual showing, the most high water content that often kind of former W/O exists with stable form and can not separate out is different, the simple corrosion using the water cut in a norm controlling crude oil can not prevent crude oil pipeline.Therefore, test the existence form of former W/O, specify the maximum water content that various former W/O can not be separated out, for the corrosion protection improving pipeline operation efficiency and crude oil pipeline, there is important directive significance.
Summary of the invention
The object of the invention is for adopting water cut in oil film microscopic inspection test crude oil at present, the problems such as test result and actual condition difference is large, poor reproducibility, propose a kind of by adopting step-test procedure, Simulation of Crude Oil is defeated at pipe tests the water cut in crude oil with the actual working conditions in accumulating, test condition is stablized, water stability testing method in a kind of crude oil of test result favorable reproducibility.
The present invention specifically adopts following technical scheme:
A kind of water stability testing method in crude oil, specifically comprises the following steps:
Step one: adopt supercentrifuge to dewater to crude oil to be measured;
Step 2: the crude oil to be measured of dehydration is weighed, and the crude oil to be measured of dehydration is added in test bottle;
Step 3: add deionized water in crude oil to be measured, forms oil-water mixture;
Step 4: adopt magnetic agitation method that mixed liquor is stirred 24 hours, form stable oil-water emulsion, as test fluid;
Step 5: leave standstill 24 hours, adopts ultrasonic oscillator, and Simulation of Crude Oil stores and transport condition, carries out dewatering operation to test fluid;
Step 6: the electrical characteristics adopting test electrode test test bottle bottom solution, have determined whether that elutriation goes out;
Step 7: when there being elutriation to go out, liquid water content be now water can in crude oil to be measured stable existence and the maximum water content that can not separate out; When anhydrous precipitation, repeat step 3 to step 6, until there is elutriation to go out bottom test bottle.
Preferably, the rotating speed of described supercentrifuge is not less than 10000 revs/min.
Preferably, the test bottle in described step 2 is dry sealed glass jars.
Preferably, in described step 3, the ratio of deionized water is 0.1%, 0.3%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1.0% of crude oil weight to be measured.
The beneficial effect that the present invention has is: adopt step-test procedure, and Simulation of Crude Oil manages the actual working conditions in defeated and accumulating, and test condition is stablized, test result favorable reproducibility.
Accompanying drawing explanation
Fig. 1 is water stability testing method flow diagram in a kind of crude oil.
Embodiment
Below in conjunction with the drawings and specific embodiments, the specific embodiment of the present invention is described further:
As shown in Figure 1, a kind of water stability testing method in crude oil, specifically comprises the following steps:
Step one: adopt supercentrifuge to dewater to crude oil to be measured; The rotating speed of supercentrifuge is not less than 10000 revs/min.
Step 2: the crude oil to be measured of dehydration is weighed, and the crude oil to be measured of dehydration is added in test bottle; Test bottle is dry sealed glass jars.
Step 3: add deionized water in crude oil to be measured, forms oil-water mixture; The ratio of deionized water is 0.1% of crude oil weight to be measured.
Step 4: adopt magnetic agitation method that mixed liquor is stirred 24 hours, form stable oil-water emulsion, as test fluid;
Step 5: leave standstill 24 hours, adopts ultrasonic oscillator, and Simulation of Crude Oil stores and transport condition, carries out dewatering operation to test fluid;
Step 6: the electrical characteristics adopting test electrode test test bottle bottom solution, have determined whether that elutriation goes out;
Step 7: when there being elutriation to go out, liquid water content be now water can in crude oil to be measured stable existence and the maximum water content that can not separate out; When anhydrous precipitation, repeat step 3 to step 6, until there is elutriation to go out bottom test bottle.
Under test condition, just have elutriation go out liquid water content be water can in crude oil to be measured stable existence and the maximum water holding capacity that can not separate out.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned citing, and the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (4)
1. a water stability testing method in crude oil, is characterized in that, specifically comprise the following steps:
Step one: adopt supercentrifuge to dewater to crude oil to be measured;
Step 2: the crude oil to be measured of dehydration is weighed, and the crude oil to be measured of dehydration is added in test bottle;
Step 3: add deionized water in crude oil to be measured, forms oil-water mixture;
Step 4: adopt magnetic agitation method that mixed liquor is stirred 24 hours, form stable oil-water emulsion, as test fluid;
Step 5: leave standstill 24 hours, adopts ultrasonic oscillator, and Simulation of Crude Oil stores and transport condition, dewaters to test fluid;
Step 6: the electrical characteristics adopting test electrode test test bottle bottom solution, have determined whether that elutriation goes out;
Step 7: when there being elutriation to go out, liquid water content be now water can in crude oil to be measured stable existence and the maximum water content that can not separate out; When anhydrous precipitation, repeat step 3 to step 6, until there is elutriation to go out bottom test bottle.
2. water stability testing method in a kind of crude oil as claimed in claim 1, is characterized in that, the rotating speed of described supercentrifuge is not less than 10000 revs/min.
3. water stability testing method in a kind of crude oil as claimed in claim 1, is characterized in that, the test bottle in described step 2 is dry sealed glass jars.
4. water stability testing method in a kind of crude oil as claimed in claim 1, is characterized in that, in described step 3, the ratio of deionized water is 0.1%, 0.3%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1.0% of crude oil weight to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510586789.8A CN105223235A (en) | 2015-09-15 | 2015-09-15 | A kind of water stability testing method in crude oil |
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| CN201510586789.8A CN105223235A (en) | 2015-09-15 | 2015-09-15 | A kind of water stability testing method in crude oil |
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| CN105223235A true CN105223235A (en) | 2016-01-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271327A (en) * | 2016-04-07 | 2017-10-20 | 中国石油化工股份有限公司 | Evaluate the visualization rheological method of emulsion stability |
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| US4644263A (en) * | 1984-12-13 | 1987-02-17 | Marathon Oil Company | Method and apparatus for measuring water in crude oil |
| CN1945274A (en) * | 2006-10-16 | 2007-04-11 | 大庆油田有限责任公司 | Method for measuring crude oil water content |
| CN102360006A (en) * | 2011-08-05 | 2012-02-22 | 郑州光力科技股份有限公司 | Method for measuring trace water in oil |
| US20120160709A1 (en) * | 2010-12-28 | 2012-06-28 | Grzegorz Jan Kusinski | Processes and systems for characterizing and blending refinery feedstocks |
| CN104502566A (en) * | 2014-12-18 | 2015-04-08 | 中国石油天然气股份有限公司 | Method for measuring water content of crude oil |
| CN104678081A (en) * | 2015-01-27 | 2015-06-03 | 中国石油化工股份有限公司 | Testing method of pH value of crude oil |
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2015
- 2015-09-15 CN CN201510586789.8A patent/CN105223235A/en active Pending
Patent Citations (6)
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| US4644263A (en) * | 1984-12-13 | 1987-02-17 | Marathon Oil Company | Method and apparatus for measuring water in crude oil |
| CN1945274A (en) * | 2006-10-16 | 2007-04-11 | 大庆油田有限责任公司 | Method for measuring crude oil water content |
| US20120160709A1 (en) * | 2010-12-28 | 2012-06-28 | Grzegorz Jan Kusinski | Processes and systems for characterizing and blending refinery feedstocks |
| CN102360006A (en) * | 2011-08-05 | 2012-02-22 | 郑州光力科技股份有限公司 | Method for measuring trace water in oil |
| CN104502566A (en) * | 2014-12-18 | 2015-04-08 | 中国石油天然气股份有限公司 | Method for measuring water content of crude oil |
| CN104678081A (en) * | 2015-01-27 | 2015-06-03 | 中国石油化工股份有限公司 | Testing method of pH value of crude oil |
Non-Patent Citations (3)
| Title |
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| 国家发展和改革委员会: "《SY/T5402-2008:原油含水量的测定 电脱法》", 16 June 2008 * |
| 张彩霞: ""浅析原油水分测定方法及溶剂的选择"", 《广东化工》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271327A (en) * | 2016-04-07 | 2017-10-20 | 中国石油化工股份有限公司 | Evaluate the visualization rheological method of emulsion stability |
| CN107271327B (en) * | 2016-04-07 | 2019-09-10 | 中国石油化工股份有限公司 | Evaluate the visualization rheological method of emulsion stability |
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Application publication date: 20160106 |