CN1945274A - Method for detecting crude oil water content - Google Patents
Method for detecting crude oil water content Download PDFInfo
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- CN1945274A CN1945274A CNA200610140527XA CN200610140527A CN1945274A CN 1945274 A CN1945274 A CN 1945274A CN A200610140527X A CNA200610140527X A CN A200610140527XA CN 200610140527 A CN200610140527 A CN 200610140527A CN 1945274 A CN1945274 A CN 1945274A
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Abstract
The present invention is method of determining water content in crude oil. The method includes cooling crude oil in a refrigerator and inclining and stirring to separate out free water from crude oil, weighing the free water in a electronic balance, determining the weight of emulsified water and suspend water in centrifugal process or distilling process, calculating the total water weight, and calculating the weight percentage of water in crude oil. The perfected method has raised determining precision.
Description
Technical field:
The present invention relates to a kind of detection method in oil recovery field, oil field, especially a kind of method for detecting crude oil water content.
Background technology:
The crude oil that oilfield exploitation comes out general all in various degree contain moisture, crude oil water content is meant that the quality of former W/O accounts for the percentage of oil-water mixture gross mass.That is to say, measure water content in crude oil service property (quality) number percent as measurement result.These moisture exist with emulsified state, suspended state and free state usually." before measuring sample ... sample and water are mixed, otherwise influence test findings " described among GB/T8929-88 " detecting crude oil water content method " (way of distillation) 4.2.2.Only be fit to exist the crude oil of emulsified water, water in suspension at the detecting crude oil water content of foregoing description, have the crude oil of free water then to be not suitable for for the oil field high water-cut stage.Because under the uniform temperature condition, crude oil and free water can not be evenly under artificial condition, stably mix, when measuring quantity of sample, because the density of profit is different, free water has been stayed the bottom of container usually, and the sample result of measuring like this is just on the low side, and the resultant error of mensuration is bigger, the parallel sample fluctuation is also bigger, can not truly reflect liquid water content in the crude oil.
Summary of the invention:
In order to overcome disadvantages of background technology, the invention provides a kind of method for detecting crude oil water content, this method has solved the big problem of middle and high wet oil liquid water content error at measurment, has improved the measuring accuracy of crude oil water content, the perfect assay method of crude oil water content.
Technical scheme of the present invention is: this method for detecting crude oil water content comprises the following steps:
(1), mass method takes by weighing the quality of free water in the crude oil: (1), weigh oil, water, bucket gross weight in the balance, accurate to 0.1g, be designated as ml; (2), by crude oil is lowered the temperature, reduce to 0 ℃～-2 ℃, stir and the evacuation bucket in free water, weigh, accurate to 0.1g, be designated as m2; (3), the heating oil sample, be no more than 40 ℃, the 3min that heats while stirring, after oil sample stirs evenly, stand-by;
(2) centrifuge method is surveyed emulsified coarse-oil contained water: (1), preheating hydro-extractor to 50 ℃ constant temperature; Water bath with thermostatic control is preheated to 50 ℃ of constant temperature; (2), take by weighing the 10g oil sample in the centrifuge tube, accurate to 0.1g; (3), in centrifuge tube, add 3～4 of emulsion breakers, constant temperature 5min in 50 ℃ water-bath; (4), in the heavy cover of hydro-extractor, add 50 ℃ an amount of buffered water, put into centrifuge tube, in the hydro-extractor of more centrifugal heavy cover being packed into, timing 25min; Start the speed regulator knob gradually, in 2 minutes, make turn up 3000～3500r/min; (5), reading, vertically read the volume V of water in the centrifuge tube, read accurate to 0.01mL; (6), twice replicate determination, its reading must not surpass a scale of centrifuge tube, two results' that the row of making even is then measured arithmetic mean is as the water cut of sample; (7), calculate:
The moisture content percentage composition B of sample is calculated as follows:
B＝(V÷m)×100％；
In the formula: B----emulsified water percentage composition;
The volume of water in the V----receptacle, ml;
The quality of m----sample, g.(density of distilled water is 1g/cm3)
(3), the water content in crude oil of water calculates:
1, sample bucket clean dry is weighed accurate, write down and be m3 to 0.1g.
2, total moisture calculating:
In the formula: m1---oil, water, bucket quality, g;
M2---oil, bucket quality, g;
M3---empty bucket quality, g;
B---emulsified water percentage composition.
The present invention has following beneficial effect: emulsified water, water in suspension are to be present in equably in the oil basically in the crude oil, and free water then is not.Emulsified water in the separation crude oil, water in suspension are usually with the way of distillation or centrifuge method, and take the method for Physical temperature-lowering among the free water the present invention in the branch crude oil, promptly when measuring crude oil water containing, by crude oil is carried out Physical temperature-lowering, separate the free water in the crude oil with inclination, stirring method, weigh up the quality of free water with electronic balance, determine the emulsified water in the crude oil sample, the quality of water in suspension with the centrifuge method or the way of distillation, calculate the gross mass of water in the crude oil sample again, calculate the mass percent of crude oil water content at last.
The present invention is by the method for Physical temperature-lowering: 1, the free water in the crude oil is thoroughly separated with oil, obtain the quality of free water after, measure the quality of emulsified water, water in suspension again, calculate the mass percent of the water in the crude oil sample thus.Solved GB/T8929-88 and mixed the inhomogeneous measuring error that causes because of the existence of free water.2, all adopt electronic balance to replace graduated cylinder to measure the quality of free water and crude oil in whole separation, mensuration process, reduced systematic error, measuring accuracy has obtained large increase.3, solved the big problem of middle and high wet oil liquid water content error at measurment by above-mentioned improvement, improved the measuring accuracy of crude oil water content, the perfect assay method of crude oil water content.
Embodiment:
The invention will be further described below in conjunction with embodiment: this method for detecting crude oil water content comprises the following steps:
(1) centrifuge method is surveyed the instrument material of moisture usefulness.
1, centrifugal moisture analyzer: centrifugal function heating and energy constant temperature are at 50 ℃ ± 1 ℃, and rotating speed is more than 3000r/min.
2, centrifuge tube: 1～10ml scale division value is 0.2ml, and 1～0.3ml scale division value is 0.1ml, and the following scale division value of 0.3ml is 0.03ml.
3, thermostat water bath: can immerse 10ml groove place to centrifuge tube, and can control temperature at 50 ℃ ± 1 ℃.
4, electronic balance: range is greater than 2000g, and precision is greater than 0.1g.
5,10kg narrow-mouthed bottle, glass paddle is some.
6, refrigerator-freezer can cool to below 0 ℃ and gets final product.
(2) mass method takes by weighing the quality of free water in the crude oil
1, wipe the outside greasy dirt of sample bucket earlier, weigh oil, water, bucket gross weight in the balance, accurate to 0.1g, be designated as ml.
2, by refrigerator-freezer crude oil is lowered the temperature, reduce to 0 ℃ ,-1 ℃ or-2 ℃, stir and the interior free water of evacuation bucket, weigh, accurate to 0.1g, be designated as m2.
3, the heating oil sample is no more than 40 ℃, and the 3min that heats while stirring is after oil sample stirs evenly, stand-by.
(3) centrifuge method is surveyed emulsified coarse-oil contained water:
1, opens hydro-extractor power switch and heater switch, make hydro-extractor be preheated to 50 ℃ of constant temperature; Open the water bath with thermostatic control switch, make water preheat to the 50 ℃ constant temperature in the water bath with thermostatic control.
2, claim sample, in the centrifuge tube of cleaning in advance, drying, take by weighing the 10g oil sample, accurate to 0.1g.
3, in centrifuge tube, add 3～4 of emulsion breakers, constant temperature 5min in 50 ℃ water-bath.
4, adding an amount of buffered water (50 ℃) in the heavy cover of hydro-extractor is put into centrifuge tube, in the hydro-extractor of more centrifugal heavy cover being packed into, make centrifugal heavy cover symmetrical balance after, build centrifuge cup; Treat to dial timing watch behind the constant temperature, regularly 25min; Start the speed regulator knob gradually, in 2 minutes, make turn up 3000～3500r/min; When the schedule time arrives, timing watch cut off the power supply automatically stop after, the speed regulator knob is made zero, and closes all switches.
5, reading is vertically read the volume V of water in the centrifuge tube, reads accurately to 0.01mL, and sight line should be in same surface level with the water surface, reads the concave surface point of contact.
6, twice replicate determination, its reading must not surpass a scale of centrifuge tube, and two results' that the row of making even is then measured arithmetic mean is as the water cut of sample.
7, oil sample is moisture less than 0.03%, confirms that moisture is vestige.
8, calculate:
The moisture content percentage composition B of sample is calculated as follows
B＝(V÷m)×100％
If any contamination precipitation, should change formula promptly in the water content that centrifuge tube is read:
B=[(V-v is assorted) ÷ m] * 100%
In the formula: B----emulsified water percentage composition;
The volume of water in the V----receptacle, ml;
V is assorted--the volume of impurity, ml;
The quality of m----sample, g.(density of distilled water is 1g/cm3)
(4) water content in crude oil of water calculates
1, sample bucket clean dry is weighed accurate, write down and be m3 to 0.1g.
2, total moisture calculating:
In the formula: m1---oil, water, bucket quality, g;
M2---oil, bucket quality, g;
M3---empty bucket quality, g;
B---emulsified water percentage composition.
(5) after the way of distillation is measured the method for liquid water content in the crude oil mass method is taken by weighing the quality of free water in the crude oil in carrying out (two), operate according to GB/T8929-88 " detecting crude oil water content method " (way of distillation) method, the water content in crude oil computing method that contain free water according to (four) are calculated and are got final product at last.
Adopt method of the present invention to measure crude oil water containing following some advantage arranged:
1, the method has been widened the scope of application of crude water content analysis, makes the oilfield exploitation later stage Middle and high Wet crude also can accurately be measured.
2, the method by Physical temperature-lowering makes the free water in the crude oil thoroughly separate with oil, divides Do not measure the quality of free water and emulsified water, water in suspension, can reduce crude water content measurement mistake Difference improves the accuracy of analyzing.
3, by replace the quality of free water in the graduated cylinder weighing crude oil with electronic balance, can carry High analyte speed and precision reduce systematic error.
4, the method have simple to operate, analysis speed fast, analyze smart high, in having filled up, The blank of high water-cut stage crude oil water containing analytical technology. At present, the method gets at Daqing oil field To extensive use.
Claims (1)
1, a kind of method for detecting crude oil water content is characterized in that: comprise the following steps:
(1), mass method takes by weighing the quality of free water in the crude oil:
(1), weigh oil, water, bucket gross weight in the balance, accurate to 0.1g, be designated as ml;
(2), by crude oil is lowered the temperature, stir and the evacuation bucket in free water, weigh, accurate to 0.1g, be designated as m2;
(3), the heating oil sample, be no more than 40 ℃, the 3min that heats while stirring, after oil sample stirs evenly, stand-by;
(2) centrifuge method is surveyed emulsified coarse-oil contained water:
(1), preheating hydro-extractor to 50 ℃ constant temperature; Water bath with thermostatic control is preheated to 50 ℃ of constant temperature;
(2), take by weighing the 10g oil sample in the centrifuge tube, accurate to 0.1g;
(3), in centrifuge tube, add 3～4 of emulsion breakers, constant temperature 5min in 50 ℃ water-bath;
(4), in the heavy cover of hydro-extractor, add 50 ℃ an amount of buffered water, put into centrifuge tube, in the hydro-extractor of more centrifugal heavy cover being packed into, timing 25min; Start the speed regulator knob gradually, in 2 minutes, make turn up 3000～3500r/min;
(5), reading, vertically read the volume V of water in the centrifuge tube, read accurate to 0.01mL;
(6), twice replicate determination, its reading must not surpass a scale of centrifuge tube, two results' that the row of making even is then measured arithmetic mean is as the water cut of sample;
(7), calculate:
The moisture content percentage composition B of sample is calculated as follows:
B＝(V÷m)×100％；
In the formula: B----emulsified water percentage composition;
The volume of water in the V----receptacle, ml;
The quality of m----sample, g.(density of distilled water is 1g/cm3)
(3), the water content in crude oil of water calculates:
1, sample bucket clean dry is weighed accurate, write down and be m3 to 0.1g.
2, total moisture calculating:
In the formula: m1---oil, water, bucket quality, g;
M2---oil, bucket quality, g;
M3---empty bucket quality, g;
B---emulsified water percentage composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610140527XA CN100526850C (en) | 2006-10-16 | 2006-10-16 | Method for detecting crude oil water content |
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| CNB200610140527XA CN100526850C (en) | 2006-10-16 | 2006-10-16 | Method for detecting crude oil water content |
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| CN1945274A true CN1945274A (en) | 2007-04-11 |
| CN100526850C CN100526850C (en) | 2009-08-12 |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645447A (en) * | 2012-05-10 | 2012-08-22 | 大连交通大学 | Device and method for measuring water content in crude oil by means of distillation method |
| CN102778410A (en) * | 2012-07-31 | 2012-11-14 | 张伟 | Method and device for rude oil on-line phase-changing water-containing detection |
| CN102937560A (en) * | 2012-10-29 | 2013-02-20 | 西安工程大学 | Method for measuring water content in crude oil |
| CN103868817A (en) * | 2014-03-27 | 2014-06-18 | 济钢集团有限公司 | Device and method for rapidly measuring water content of coal tar |
| CN104502566A (en) * | 2014-12-18 | 2015-04-08 | 中国石油天然气股份有限公司 | Method for testing water content of crude oil |
| CN105223235A (en) * | 2015-09-15 | 2016-01-06 | 中国石油化工股份有限公司 | A kind of water stability testing method in crude oil |
| CN105311860A (en) * | 2014-07-29 | 2016-02-10 | 中国石油化工股份有限公司 | Dry gas holder sealing oil purification treatment method |
| CN105823868A (en) * | 2015-12-23 | 2016-08-03 | 艾山江·买买提依明 | Sampling type on-line detector for water content of crude oil |
| CN105973746A (en) * | 2016-01-25 | 2016-09-28 | 天津城建大学 | Apparatus for testing unfrozen water content of frozen soil, and method thereof |
| CN105987854A (en) * | 2015-02-09 | 2016-10-05 | 昆山中慈工控科技开发有限公司 | Full-automatic crude oil water content distillation measurement method using weighing-type plunger reciprocating suction sampling |
| CN106596322A (en) * | 2016-12-13 | 2017-04-26 | 江苏天诺道路材料科技有限公司 | Method for quickly measuring solid content of emulsified asphalt |
| CN106970005A (en) * | 2017-05-05 | 2017-07-21 | 中国石油化工股份有限公司 | Crude oil water content assay method |
| CN109115650A (en) * | 2018-06-22 | 2019-01-01 | 苏州净瑞环保科技有限公司 | Gutter oil oil content accurate quantification method |
| CN109212168A (en) * | 2018-09-19 | 2019-01-15 | 中国石油天然气股份有限公司 | Crude oil measurement equipment, centrifugal device and crude oil water content metering method, equipment |
| CN109239313A (en) * | 2018-08-15 | 2019-01-18 | 中国石油天然气股份有限公司 | Aqueous devices and methods therefor is surveyed in Wellhead crue oil sampling |
| CN109696372A (en) * | 2017-10-23 | 2019-04-30 | 中国石油天然气股份有限公司 | Aqueous assay method |
| CN114459944A (en) * | 2021-12-31 | 2022-05-10 | 中海油(天津)油田化工有限公司 | Online crude oil water content detection device |
-
2006
- 2006-10-16 CN CNB200610140527XA patent/CN100526850C/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645447A (en) * | 2012-05-10 | 2012-08-22 | 大连交通大学 | Device and method for measuring water content in crude oil by means of distillation method |
| CN102778410A (en) * | 2012-07-31 | 2012-11-14 | 张伟 | Method and device for rude oil on-line phase-changing water-containing detection |
| CN102937560A (en) * | 2012-10-29 | 2013-02-20 | 西安工程大学 | Method for measuring water content in crude oil |
| CN102937560B (en) * | 2012-10-29 | 2015-06-24 | 西安工程大学 | Method for measuring water content in crude oil |
| CN103868817A (en) * | 2014-03-27 | 2014-06-18 | 济钢集团有限公司 | Device and method for rapidly measuring water content of coal tar |
| CN105311860A (en) * | 2014-07-29 | 2016-02-10 | 中国石油化工股份有限公司 | Dry gas holder sealing oil purification treatment method |
| CN104502566A (en) * | 2014-12-18 | 2015-04-08 | 中国石油天然气股份有限公司 | Method for testing water content of crude oil |
| CN105987854A (en) * | 2015-02-09 | 2016-10-05 | 昆山中慈工控科技开发有限公司 | Full-automatic crude oil water content distillation measurement method using weighing-type plunger reciprocating suction sampling |
| CN105223235A (en) * | 2015-09-15 | 2016-01-06 | 中国石油化工股份有限公司 | A kind of water stability testing method in crude oil |
| CN105823868A (en) * | 2015-12-23 | 2016-08-03 | 艾山江·买买提依明 | Sampling type on-line detector for water content of crude oil |
| CN105973746A (en) * | 2016-01-25 | 2016-09-28 | 天津城建大学 | Apparatus for testing unfrozen water content of frozen soil, and method thereof |
| CN106596322A (en) * | 2016-12-13 | 2017-04-26 | 江苏天诺道路材料科技有限公司 | Method for quickly measuring solid content of emulsified asphalt |
| CN106970005A (en) * | 2017-05-05 | 2017-07-21 | 中国石油化工股份有限公司 | Crude oil water content assay method |
| CN109696372A (en) * | 2017-10-23 | 2019-04-30 | 中国石油天然气股份有限公司 | Aqueous assay method |
| CN109115650A (en) * | 2018-06-22 | 2019-01-01 | 苏州净瑞环保科技有限公司 | Gutter oil oil content accurate quantification method |
| CN109239313A (en) * | 2018-08-15 | 2019-01-18 | 中国石油天然气股份有限公司 | Aqueous devices and methods therefor is surveyed in Wellhead crue oil sampling |
| CN109212168A (en) * | 2018-09-19 | 2019-01-15 | 中国石油天然气股份有限公司 | Crude oil measurement equipment, centrifugal device and crude oil water content metering method, equipment |
| CN114459944A (en) * | 2021-12-31 | 2022-05-10 | 中海油(天津)油田化工有限公司 | Online crude oil water content detection device |
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