CN106645264A - Differential pressure type crude oil condensation point measuring device and method - Google Patents
Differential pressure type crude oil condensation point measuring device and method Download PDFInfo
- Publication number
- CN106645264A CN106645264A CN201610889918.5A CN201610889918A CN106645264A CN 106645264 A CN106645264 A CN 106645264A CN 201610889918 A CN201610889918 A CN 201610889918A CN 106645264 A CN106645264 A CN 106645264A
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- Prior art keywords
- pipeline section
- temperature
- condensation point
- crude oil
- test pipeline
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
Abstract
The invention discloses a differential pressure type crude oil condensation point measuring device and method and belongs to the technical field of oil gas automatic metering. The device comprises a testing tube section, a temperature controlling system, a gas storage tank, pressure gauges, a valve and a matched pipeline, wherein the gas storage tank is connected with the testing tube section so as to provide a gas source and regulate the pressure in the testing tube section, the whole testing tube section is located in the temperature controlling system to regulate the temperature during testing, the inlet pressure gauge and the outlet pressure gauge are connected with the testing tube section to test the pressure change at an inlet and an outlet, and the crude oil condensation point is judged according to the pressure difference of the inlet and the outlet. The method uses the device to measure the condensation point. The device is simple in structure, convenient to operate and capable of accurately measuring the condensation point of crude oil with pressure, and the oil structure destruction degree of the method using the device during measuring is smaller than that of a traditional measuring method.
Description
Technical field
The invention belongs to oil gas automatic gauge technical field, and in particular to the device that a kind of differential condensation point of crude oil is determined
And method.
Background technology
In recent years, it is domestic for the demand of crude oil is also continuously increased as China's economy is lasting, high speed development, accordingly
The development of ground crude oil pipeline is also very fast.Carrying out pipeline oil transportation safe efficiently can reduce the operating cost of petroleum industry, energy-conservation
Consumption reduction.For crude oil pipeline, condensation point of crude oil is an important parameter, and the accuracy of its measurement is not only related to oil product
Product storage, the energy-saving problem of transport, or the important evidence of its flowing safety guarantee.
Condensation point of crude oil referred under certain heating power, shearing condition, the maximum temperature that crude oil loses flowability, and it is depended on
The materialization composition of crude oil and coherent condition.The gelling of oil product and the solidification of pure compound are very different, and oil product is not bright
True setting temperature, so-called " solidification " is intended only as on the whole losing mobility, and not all component all becomes
Solid.
However, existing measuring method need to be sampled test to piped oil, the thermal history in sampling process with cut
Cut history and impact is inherently produced on condensation point of crude oil, and this measuring method is inefficient, it is impossible to reflect piped oil in time
Parameter.Therefore, a kind of high accuracy, efficient condensation point of crude oil are developed and determines device, for the safety and economic operation for ensureing pipeline,
With important engineering significance.
The content of the invention
In view of this, the present invention is intended to provide a kind of differential condensation point of crude oil determines device and assay method, for online
The condensation point of measuring band pressure pipe output oil.
In order to realize the purpose of the present invention, the present invention provides the device that a kind of differential condensation point of crude oil is determined, and it includes surveying
Test tube section, air accumulator, pressure gauge, temperature-controlling system and valve, wherein, the air accumulator is connected with the test pipeline section, to provide gas
Source simultaneously adjusts the pressure in the test pipeline section, and the test pipeline section was tested in the temperature-controlling system with adjusting
Temperature in journey, the inlet pressure gauge and delivery gauge are connected with the test pipeline section, with test access and exit
Pressure change, condensation point of crude oil is judged by entrance with the pressure difference value of outlet.
Preferably, the test pipeline section adopts " U-shaped " structure, and the level height of entrance one end is higher than outlet 1.5cm, and
Entrance and outlet top remain with least 5ml gas compartments.
Preferably, the draw ratio of test pipeline section " U-shaped " the bottom section is between the ︰ 1 of 7 ︰ 1 to 9.
Preferably, gas is air or nitrogen in the air accumulator.
Preferably, in 0～2.5MPa, accuracy class is 0.4 to the test scope of the inlet pressure gauge, delivery gauge
Level.
Differential condensation point of crude oil method for measuring provided by the present invention, specifically includes following steps：
1st, crude oil filling：The test pipeline section is heated using the temperature-controlling system, makes the temperature of the test pipeline section
Degree is consistent with oil product temperature, and pipeline purging and gas injection are carried out to the test pipeline section using the air accumulator, and control oil product enters described
Test pipeline section, and full of the bottom section of the test pipeline section；
2nd, lower the temperature：The oil product in the test pipeline section and pipeline section is lowered the temperature using the temperature-controlling system, rate of temperature fall
It is controlled to 0.5 DEG C/min；
3rd, condensation point test：Start cooling from injection oil product temperature, every 2 DEG C, read the inlet pressure gauge and it is described go out
Mouth pressure gauge registration, judges whether temperature is down to condensation point of crude oil, if not by analyzing entrance with the size of outlet pressure difference
Then continue cooling to condensation point；
4th, heat up：After the completion of condensation point test, the oil product in the test pipeline section and pipeline section is entered using the temperature-controlling system
Row heats up, and heating rate is controlled to 2.5 DEG C/min, and temperature is elevated above more than 10 DEG C of condensation point；
5th, oil extraction：The oil product in pipeline section is discharged using the gas in the air accumulator.
The invention has the beneficial effects as follows simple structure, easy to operate, can on-line determination condensation point of crude oil with pressure exactly, and
It is little compared with traditional measurement method to oil product structure destructiveness in measurement process, it is to realize the determination of freezing point of crude oil with pressure and manage defeated
The online determination of freezing point of crude oil provides technological means.
Description of the drawings
Fig. 1 is the schematic diagram that the differential condensation point of crude oil that the present invention is provided determines device.
Fig. 2 is the example that inlet pressure changes with outlet pressure in condensation point test process of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
It is further described, it is to be understood that the scope of the present invention is not limited to this.
As shown in figure 1, Novel differential pressure type condensation point of crude oil provided by the present invention determines device, including：The test pipeline section 1,
Temperature-controlling system 2, air accumulator 3, inlet pressure gauge 4, delivery gauge 5, intake valve 6, enter oral thermometer valve 7, exit list valve 8, inlet valve 9
With delivery valve 10.
The test entrance of pipeline section 1 is connected by intake valve 6 with air accumulator 3, by entering oral thermometer valve 7 and inlet pressure gauge
4 are connected, and test pipeline section 1 outlet is connected by exit list valve 8 with delivery gauge 5, and the test pipeline section 1 is placed in control
It is by the oil-feed of inlet valve 9 and fuel-displaced by delivery valve 10 in warm system 2.The test pipeline section 1 preferably adopts " U-shaped " structure,
The level height of entrance one end remains with least 5ml gas compartments, institute higher than outlet 1.5cm in entrance and outlet top
State the ︰ 1 of draw ratio preferably 7 ︰ 1-9 of test pipeline section 1 " U-shaped " bottom section.
Determination of freezing point experiment keeps the test pipeline section 1 bottom section to be in horizontality before starting, it is ensured that intake valve 6, oil-feed
Valve 9, delivery valve 10 are closed, enter oral thermometer valve 7, exit list valve 8 in open mode.
Crude oil is filled：Heated using 2 pairs of test pipeline sections 1 of the temperature-controlling system, make the temperature of the test pipeline section 1
Spend consistent with crude oil temperature to be measured for 55 DEG C, open intake valve 6 and delivery valve 10, entered using 3 pairs of test pipeline sections 1 of air accumulator
Row pipeline purging, closes delivery valve 10 and intake valve 6, opens inlet valve 9, and it is described oil product is slowly injected by control delivery valve 10
Test pipeline section 1, full of pipeline section bottom section, closes delivery valve 10 and inlet valve 9.
Cooling：Lowered the temperature using 2 pairs of test pipeline sections 1 of the temperature-controlling system and the crude oil in pipeline section, rate of temperature fall
It is controlled to 0.5 DEG C/min.
Condensation point is tested：From the beginning of 55 DEG C, every 2 DEG C, the inlet pressure gauge 4 and the registration of the delivery gauge 5 are read,
Obtain inlet pressure to change as shown in Fig. 2 judging that the condensation point of crude oil is 29 DEG C with outlet pressure.
Heat up：Condensation point test is completed, and is carried out using 2 pairs of test pipeline sections 1 of the temperature-controlling system and the oil product in pipeline section
Heat up, heating rate is controlled to 2.5 DEG C/min, and temperature rises to 45 DEG C.
Oil extraction：Intake valve 6 and delivery valve 10 are opened, using the gas in the air accumulator 3 by the test pipeline section 1
Oil product is discharged, and closes delivery valve 10 and intake valve 6.
From embodiment of above, present configuration is simple, easy to operate, and test operation is to oil product in temperature-fall period
The structure influence of formation is little, it is possible to achieve the condensation point on-line measurement of crude oil pipeline with pressure is required.
Claims (5)
1. a kind of Novel differential pressure type condensation point of crude oil determines device, including test pipeline section (1), temperature-controlling system (2), air accumulator (3), enters
Mouth pressure gauge (4), delivery gauge (5) and valve, it is characterised in that test pipeline section (1) entrance and air accumulator (3) and entrance
Pressure gauge (4) is connected, and test pipeline section (1) outlet is connected with delivery gauge (5)；Test pipeline section (1) adopts " U-shaped "
Structure, the level height of entrance one end and remains with the >=gas space of 5mL on entrance and outlet top higher than outlet 1.5cm
Between, test pipeline section (1) is placed in temperature-controlling system (2).
2. measure device according to claim 1, it is characterised in that the draw ratio of test pipeline section (1) " U-shaped " bottom section
For 7:1～9:1.
3. measure device according to claim 1, it is characterised in that the interior gas of the air accumulator (3) is air or nitrogen.
4. measure device according to claim 1, it is characterised in that the inlet pressure gauge (4), delivery gauge (5)
Pressure limit be 0～2.5MPa, accuracy class is 0.4 grade.
5. a kind of differential condensation point of crude oil assay method, using claim 1-4 any one described in differential condensation point of crude oil
Determine device, it is characterised in that specifically include following steps：
S1. crude oil filling：Test pipeline section (1) is heated using the temperature-controlling system (2), makes the test pipeline section
(1) temperature is consistent with oil product temperature, and pipeline purging and gas injection are carried out to test pipeline section (1) using air accumulator (3)；Control oil product
Into test pipeline section (1), and full of the bottom section of test pipeline section (1)；
S2. lower the temperature：The oil product in test pipeline section (1) and pipeline section is lowered the temperature using the temperature-controlling system (2), cooling speed
Rate is controlled to 0.5 DEG C/min；
S3. condensation point test：Start cooling from injection oil product temperature, every 2 DEG C, read the inlet pressure gauge (4) and it is described go out
Mouth pressure gauge (5) registration, judges whether temperature is down to condensation point of crude oil by analyzing entrance with the size of outlet pressure difference, if
Cooling is not then continued to condensation point；
S4. heat up：After the completion of condensation point test, using the temperature-controlling system (2) to the oil product in test pipeline section (1) and pipeline section
Heated up, heating rate is controlled to 2.5 DEG C/min, temperature is elevated above more than 10 DEG C of condensation point；
S5. oil extraction：The oil product in pipeline section is discharged using the gas in the air accumulator (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610889918.5A CN106645264A (en) | 2016-10-12 | 2016-10-12 | Differential pressure type crude oil condensation point measuring device and method |
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|---|---|---|---|
| CN201610889918.5A CN106645264A (en) | 2016-10-12 | 2016-10-12 | Differential pressure type crude oil condensation point measuring device and method |
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| CN201610889918.5A Pending CN106645264A (en) | 2016-10-12 | 2016-10-12 | Differential pressure type crude oil condensation point measuring device and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255651A (en) * | 2017-07-20 | 2017-10-17 | 中国石油大学(北京) | The measurement apparatus and its method of Crude Oil ＆ Petroleum Products pour point at various pressures |
| CN107796843A (en) * | 2017-11-27 | 2018-03-13 | 蔡智韬 | A kind of automatic condensation point detector with micro-pressure gradient method |
| CN108508058A (en) * | 2018-04-28 | 2018-09-07 | 中国石油大学(华东) | The online crude oil solidifying point measuring device of crude oil pipeline and method |
| CN111122643A (en) * | 2019-12-30 | 2020-05-08 | 中国石油化工股份有限公司 | Oil product pipe transportation on-line condensation point measuring system |
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| CN105136841A (en) * | 2015-09-22 | 2015-12-09 | 东北石油大学 | Novel crude oil condensation point measurement device and measurement method thereof |
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| CN2809636Y (en) * | 2005-02-05 | 2006-08-23 | 中国石油天然气集团公司 | Shear stress type analyzer and online solidifying point analyzer thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255651A (en) * | 2017-07-20 | 2017-10-17 | 中国石油大学(北京) | The measurement apparatus and its method of Crude Oil ＆ Petroleum Products pour point at various pressures |
| CN107796843A (en) * | 2017-11-27 | 2018-03-13 | 蔡智韬 | A kind of automatic condensation point detector with micro-pressure gradient method |
| CN107796843B (en) * | 2017-11-27 | 2023-10-31 | 蔡智韬 | Automatic condensation detector using micro-pressure tilting method |
| CN108508058A (en) * | 2018-04-28 | 2018-09-07 | 中国石油大学(华东) | The online crude oil solidifying point measuring device of crude oil pipeline and method |
| CN108508058B (en) * | 2018-04-28 | 2021-01-12 | 中国石油大学(华东) | Crude oil conveying pipeline on-line condensation point measuring device and method |
| CN111122643A (en) * | 2019-12-30 | 2020-05-08 | 中国石油化工股份有限公司 | Oil product pipe transportation on-line condensation point measuring system |
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