Tester of crude oil wax content

Abstract

The invention relates to a tester of crude oil wax content. The tester comprises an external barrel and an internal barrel, the internal barrel is filled with a cooling medium, a ring groove gap formed between the internal barrel and the external barrel is used for storing a crude oil sample, an internal wall and an external wall of the external barrel are mutually separated for forming a channel, and an external barrel is also provided with a liquid inlet and a liquid outlet; wherein, the channel comprises several tortuous segments, a hot-fluid medium continuously enters from the liquid inlet into the channel and is discharged from the liquid outlet, and the crude oil sample in the ring groove gap is heated in the mode. Compared with the prior art, multiple tortuous segments change the flow direction of the hot-fluid medium in the channel, so that the hot-fluid medium accompanies with generation of small whirlpools, a heat transfer coefficient of the external barrel wall surface is improved, and control precision of the temperature of the crude oil sample is guaranteed. In addition, rotation speed of the internal barrel is continuously increased, different flow fields are produced in the ring groove gap, so that turbulent flow state of the crude oil sample is realized, staffs can carry out research of wax sedimentation in the state, and key parameters corresponding to the practical situation are obtained.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a measuring instrument for the wax content of crude oil. Background technique [0002] Wax deposition in crude oil pipelines (commonly known as "waxing") refers to the crystallization and precipitation of wax molecules in crude oil due to the oil temperature falling below the wax precipitation point and reaching supersaturation, and under the action of the temperature gradient of the pipe wall, it interacts with other components in crude oil. A deposit on the pipe wall, on the one hand, reduces the flow area of ​​the pipe, reduces the effective inner diameter, increases the frictional resistance, increases the flow resistance of crude oil, and reduces the pipeline transportation capacity; on the other hand, wax deposition also increases the flow of oil into the pipe. The thermal resistance of the wall reduces the overall heat transfer coefficient and slows down the heat dissipation of th...

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Problems solved by technology

As a result, the diffusion of the crude oil sample test is different from the diffusion in the actual pipeline, resulting in a difference in the wax deposition rate.

[0010] In addition, the temperature of the outer wall of the set of devices is controlled by the temperature of the circulating water bath in the water tank 15, but because the volume of the water bath is very large, the water flow velocity inside it is very small, so it can be regarded as laminar flow, and its convective heat transfer The coefficient is very small, and heat exchange with the outer wall cannot be performed in time, so that there is a large temperature gradient on the outer wall along the axial direction, and it is difficult to ensure the temperature control accuracy

Similarly, although the inner barrel 11 contains the serpentine coil 13, the circulating water can obtain a large convective heat transfer coefficient and heat transfer surface when the circulating water flows in the tube, but due to the gap between the serpentine coil 13 and the inner barrel 11 The heat exchange is transferred through the cooling medium in the inner barrel 11, and this part of the cooling medium is stationary, that is, the heat transfer process is heat conduction, and the heat transfer coefficient is only determined by the physical properties of the cooling medium, so the heat transfer is very limited , and the heat transfer speed is slow, it will also cause a large temperature gradient on the inner wall along the axial direction, and it is difficult to ensure the temperature control accuracy

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