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Rheological evaluation method of inferior superheavy oil flow improver

A technology of flow improver and evaluation method, which is applied in the direction of flow characteristics, scientific instruments, measuring devices, etc., can solve the problems of heavy auxiliary workload, heavy testing workload, and large volatility, and achieve simple, high-efficiency, cost-effective, and strong application value , the effect of strong correlation

Inactive Publication Date: 2017-06-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity test method refers to manually blending the flow improver into the target low-quality super-heavy oil sample under certain conditions, simply testing the viscosity difference before and after the blending, and roughly judging the effectiveness of the flow improver. The results obtained by this method are subject to The method of manual mixing and specific conditions have a great influence, the results obtained are rough and fluctuate greatly, and usually require multiple operations to take the average value, it is difficult to achieve accurate quantitative evaluation, and the obtained data results are not consistent with the pipeline In the real flow field, the correlation is not strong
[0005] At present, the commonly used loop evaluation device can truly reflect the actual situation of the flow improver improving the fluidity of inferior ultra-heavy oil during pipeline transportation, but the structure and operation of the device are quite complicated, and the construction investment of the device is large; in addition, each test requires Using high-pressure nitrogen as power, different oil flow medium loop tests require a lot of cleaning and temperature control operations, and the auxiliary workload is large; in addition, due to different properties of inferior super-heavy oils, there is a strong choice for flow improvers compatibility, the test workload is huge, so it usually requires high cost to measure a set of data, which greatly hinders the development progress of the flow improver

Method used

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  • Rheological evaluation method of inferior superheavy oil flow improver
  • Rheological evaluation method of inferior superheavy oil flow improver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Place the commercially available flow improver sample SY-1 on the fixture of a strain-controlled rheometer. The torque accuracy of the rheometer is 0.1nNm, the torque range is 0.01μNm-200mNm, and the normal stress range is 0.01-50N. The applied detection frequency range is 1×10 -5 -628rad / s, set the temperature to 200°C, equilibrate to 2min, apply 1% strain, set the detection frequency range to 0.001-100rad / s, take 3 data points for each order of magnitude in logarithmic mode, and set the integration time to 1 cycle, read the phase angle data in the full test frequency range, and read its minimum value, which is listed in Table 1.

[0027] At the same time, 100ppm of the flow improver sample SY-1 was added to the inferior super heavy oil A, and the ratio of its fluidity improvement was determined by the traditional loop test, which is listed in Table 1.

Embodiment 2

[0029] Put the synthetic flow improver sample BR-3 on the fixture of the strain-controlled rheometer, the torque accuracy of the rheometer is 0.1nNm, the torque range is 0.01μNm-200mNm, and the normal stress range is 0.01-50N, which can be applied The detection frequency range is 1×10 -5 -628rad / s, set the temperature to 250°C, equilibrate to 5min, apply 5% strain, set the detection frequency range to 0.0001-500rad / s, take 5 data points for each order of magnitude in logarithmic mode, and set the integration time to 2 cycles, read the phase angle data in the full test frequency range, and read its minimum value, which is listed in Table 1.

[0030] At the same time, 100ppm of the flow improver sample BR-3 was added to the inferior super heavy oil A, and the ratio of its fluidity improvement was determined by the traditional loop test, which is listed in Table 1.

Embodiment 3

[0032] Place the commercially available flow improver sample TM-4 on the fixture of a strain-controlled rheometer, which has a torque accuracy of 0.1nNm, a torque range of 0.01μNm-200mNm, and a normal stress range of 0.01-50N, which can be applied The detection frequency range is 1×10 -5 -628rad / s, set the temperature to 300°C, equilibrate to 3min, apply 3% strain, set the detection frequency range to 0.01-500rad / s, take 7 data points for each order of magnitude in logarithmic mode, and set the integration time to For 3 cycles, read the phase angle data in the full test frequency range, and read its minimum value, which is listed in Table 1.

[0033] At the same time, 100ppm of the flow improver sample TM-4 was added to the inferior super-heavy oil A, and the ratio of its fluidity improvement was determined by the traditional loop test, which is listed in Table 1.

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Abstract

The invention relates to a rheological evaluation method of an inferior superheavy oil flow improver. The effectiveness of the flow improver applied to a target inferior superheavy oil product can be evaluated rapidly and accurately by measuring the rheological property of the flow improver. The flow improver is used for improving the flowing status of the inferior superheavy oil, the API degree of the inferior superheavy oil is less than 10 degrees, the total nitrogen content is higher than 5000 pm, the alkaline nitrogen content is higher than 1500 ppm, and the vanadium content is higher than 380 ppm. The flow improver sample is placed on a strain control type rheometer clamp, and the minimum value of a phase angle within a full-frequency range is measured by setting particular testing parameters, comprising temperature, applied strain, rotating frequency, point-getting mode and integral time, of the rheometer, so that whether the flow improver can meet the flowability improvement requirement of the inferior superheavy oil can be judged.

Description

technical field [0001] The invention relates to an evaluation method in the field of petrochemical industry, in particular to a rheological evaluation method of inferior super heavy oil flow improver. Background technique [0002] With the increasing shortage of oil resources, the exploitation and refining of heavy or even super-heavy oil has become one of the important trends in the development of the oil industry. As we all know, low-quality super-heavy oil has high density, high freezing point, high viscosity, and difficult flow. It is very difficult to transport from the mining site to the refining site whether it is transported by tanker or pipeline, which poses a challenge for researchers. The commonly used transportation method in the world is heating and decondensation or dilution and decondensation, but the material consumption and energy consumption are quite large, and the transportation cost is quite expensive. Therefore, improving the fluidity of low-quality ex...

Claims

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Application Information

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IPC IPC(8): G01N11/14
CPCG01N11/14
Inventor 娄立娟毕秦岭张艳梅于志敏张东明刘银东赵广辉王丽涛侯经纬张璐瑶卢竟蔓许倩崔晨曦
Owner PETROCHINA CO LTD
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