High-temperature high-pressure supercritical carbon dioxide capillary viscometer and utilization method thereof

A technology of capillary viscometer and carbon dioxide, which is applied in the field of rheology measurement, can solve problems such as measurement errors, achieve the effects of improving experimental accuracy, avoiding human operation factors, and avoiding measurement errors

Inactive Publication Date: 2016-06-15
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the system of supercritical carbon dioxide and viscosifier is a non-Newtonian fluid, and the system may have unsteady flow in the inner pores of the core, the use of Darcy's law will cause measurement errors

Method used

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  • High-temperature high-pressure supercritical carbon dioxide capillary viscometer and utilization method thereof
  • High-temperature high-pressure supercritical carbon dioxide capillary viscometer and utilization method thereof
  • High-temperature high-pressure supercritical carbon dioxide capillary viscometer and utilization method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Choose a polished capillary tube 8 with a radius of 0.3mm and a length of 0.5m, add 10g ethanol and 190g carbon dioxide into the lower part of the piston of the first intermediate container 1, set the temperature of the thermostat 14 to 40℃, and the back pressure valve 10 to set the back pressure to 20MPa , Adjust the stirring speed of the first magnetic stirring motor 3 and the second magnetic stirring motor 4 to 300 rad / min. Set the constant speed and constant pressure tracking pump 6 flow rate Q to 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0 mL / min, and record the corresponding pressure difference Δp as 0.22, 0.42, 0.64, 0.88, 1.17, 1.51, 1.86, 2.21, 2.61, 3.04Mpa, through formulas ②, ③, ④, draw the curve of the viscosity of the supercritical carbon dioxide-ethanol system with the shear rate when the temperature is 40℃ and the pressure is 20MPa, Such as figure 2 Shown.

Embodiment 2

[0075] The back pressure valve 10 is set to a back pressure of 30 MPa, and other conditions are set according to Example 1, and the flow rate Q of the constant speed and constant pressure tracking pump 6 is respectively 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, When 4.5 and 5.0mL / min, the corresponding pressure difference Δp is 0.24, 0.49, 0.75, 1.02, 1.38, 1.77, 2.19, 2.60, 3.07, 3.57Mpa, respectively, through formulas ②, ③, ④, the temperature is drawn as 40℃ 、The curve of the viscosity of the supercritical carbon dioxide-ethanol system with the shear rate when the pressure is 30MPa, such as image 3 Shown.

Embodiment 3

[0077] Adjust the temperature of the thermostat 14 to 50°C, and other conditions are set according to Example 1, and the flow rate Q of the constant-speed and constant-pressure tracking pump 6 is 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, respectively. , 5.0mL / min, the corresponding pressure difference Δp is 0.18, 0.34, 0.53, 0.73, 0.96, 1.24, 1.53, 1.82, 2.14, 2.50Mpa, respectively, through the formula ②, ③, ④, draw the temperature as 50℃, The curve of the viscosity of the supercritical carbon dioxide-ethanol system with the shear rate when the pressure is 20MPa, such as Figure 4 Shown.

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Abstract

The invention discloses a high-temperature high-pressure supercritical carbon dioxide capillary viscometer and a utilization method thereof. The high-temperature high-pressure supercritical carbon dioxide capillary viscometer comprises a first intermediate container, a second intermediate container, a first electromagnetic stirrer, a second electromagnetic stirrer, a carbon dioxide source, a constant-speed constant-pressure tracking pump, a first water storage tank, a polishing capillary, a differential pressure transmitter, a back-pressure valve, a first pressure gauge, a booster pump, a second water storage tank and a constant-temperature device. The viscometer overcomes the defect that conventional high-pressure capillary viscometers fail to measure compressible fluid, is applicable to estimation of viscosity of any types of non-Newtonian fluids, avoids measurement errors caused by increase and decrease of carbon dioxide for changing pressures, improves experiment precision, and realizes estimation of variation relation of fluid viscosity along with shear rate at different temperatures and under different pressures in one experiment to further realize continuous operations, thereby providing a technical support for oil field onsite drilling and fracturing construction schemes.

Description

Technical field [0001] The invention relates to the technical field of rheology measurement, in particular to a supercritical carbon dioxide capillary viscometer under high temperature and high pressure and a method of use. Background technique [0002] Because of its stable chemical properties, critical temperature close to room temperature, low critical pressure, non-toxicity, and low price, carbon dioxide is widely used in supercritical extraction, organic synthesis, precision instrument cleaning, supercritical fluid chromatography, etc. . In the process of oil and gas reservoir development, supercritical carbon dioxide can reduce clay hydration expansion, lower rock-breaking threshold pressure, and increase single well production and recovery. It has broad application prospects in underbalanced drilling and fracturing. [0003] However, due to the low viscosity of supercritical carbon dioxide and poor sand-carrying capacity, it is necessary to add a tackifier to increase its v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/08
CPCG01N11/08
Inventor 董明哲朱腾陈掌星刘梅宫厚健李亚军张涛杨泽皓寇明明李伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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