Automatic sampling device for testing indoor rheological characteristic of crude oil

Abstract

The invention relates to an automatic sampling device for testing the fluidity of indoor crude oil. The bottom of a sampling cylinder (4) and a switch body (15) are connected through screw threads; the switch body (15) is positioned in a hole sleeve (18), passes through an oil nozzle (13) of an oil sample and is connected and fixed with the outside of a simulation tank (1) through screw threads; the upper part of the sampling cylinder (4) runs through an open hole of a sealing cover (2) of the simulation tank and is fixed with the sealing cover (2) of the simulation tank through a connecting flange (5) with an exhaust port; a step electric bolt (8) of a step motor (6) is connected with a screw rod inner cylinder (9) through a fixed bolt (7); the screw rod inner cylinder (9) is connected with a piston (11) through a connecting rod (10); the step electric bolt (8), the fixed bolt (7), the screw rod inner cylinder (9) and the connecting rod (10) form a transmission mechanism of the device; the transmission mechanism is positioned in the sampling cylinder (4); the step motor (6) controlling the transmission mechanism is connected and fixed with the connecting flange (5); and the bottom of the sampling cylinder (4) is provided with an oil nozzle switch device (14) consisting of a self-power type spring and steel beads.

Description

technical field [0001] The invention is an automatic sampling device for indoor crude oil rheology test. Covers technical areas of testing and piping systems not covered by other classes. Background technique [0002] Most of my country's crude oil is "high waxy, high freezing point, high viscosity" crude oil. During the design, commissioning, operation and optimized transportation of crude oil pipelines, crude oil apparent viscosity, freezing point, viscosity-temperature curve, yield Value, thixotropy and other crude oil rheological tests, providing process calculation parameters for the formulation of various programs. However, to accurately test the rheology of crude oil, it is necessary to investigate the following influencing factors: (1) the blending ratio of crude oil from multiple production areas transported by the same crude oil pipeline; (2) the heat treatment temperature of the heated pipeline; (4) Add the amount of pour point depressant delivery process. One o...

AI Technical Summary

Problems solved by technology

The following problems exist in this process: First, the shear strength of the oil sample cannot be quantitatively controlled during the sampling and pouring process, that is, the shear strength of the oil sample during the whole process cannot be guaranteed to be consistent with that in the simulated tank, which will affect the authenticity of the test results Second, the sampling process is slow, with many intermediate links, and the temperature of the oil sample is easily affected by the external environment

In the process of sampling and pouring the test oil sample, the oil sample is out of the original simulated temperature environment, and the room temperature condition becomes the dominant factor, which is very sensitive to the temperature and the thermal history of the crude oil and its rheological test. unfavorable

The third is that individual differences have a great influence, and different people's sampling tests lead to different measurement errors. When the experimental results are abnormal, it is impossible to judge what factors cause such effects.

In short, the sampling link in the indoor crude oil rheology test experiment is one of the key links to determine whether the parameters of the oil sample rheology test are accurate, and many uncertain factors in the above-mentioned manual sampling test link due to the sampling method itself may be The long and complicated experimental oil sample simulation process was wasted due to errors in the test results, resulting in the failure of the entire experiment

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