Device and method for testing compressibility of gelled crude oil based on full-seal method

Abstract

The invention discloses a device and a method for testing the compressibility of gelled crude oil based on a full-seal method. A base oil compressing mechanism is communicated with a crude oil compressing mechanism by an elastic thin film-liquid sealing machine; meanwhile, a deformable elastic thin film with an adjustable position is arranged in a communicating pipeline and is used for separating base oil in the base oil compressing mechanism from crude oil in the crude oil compressing mechanism and preventing the blending of the base oil and the crude oil; the elastic thin film and the base oil serve as a liquid piston and compress the crude oil under the action of an external force; a measuring instrument is arranged for measuring specific volume of the crude oil and realizing a telescopic test. According to the device and the method disclosed by the invention, the compression characteristic of the gelled crude oil can be calculated, the sealing problem of the piston and a compression compartment wall is solved, the influence on measurement of the compression characteristic of the crude oil due to the deformation of a sealing ring is avoided, and the accuracy of a testing result is improved.

Description

technical field [0001] The invention relates to a device and method for testing the compressibility of gelled crude oil based on a fully sealed method. Background technique [0002] Most of the crude oil produced in my country is waxy viscous crude oil and heavy high-viscosity crude oil. During the pipeline transportation process, it is inevitable that the shutdown will occur. After the shutdown, as the temperature drops to a certain level, the crude oil in the pipeline may appear to have The gel state of a certain structural strength will cause certain difficulties to restart the pipeline. Among them, the compressibility of gelled crude oil has a very important influence on the restart of the pipeline. The study of the compressibility of gelled crude oil is helpful to determine the pressure propagation velocity of the pipeline restart, the time required for the extrusion fluid to clean the crude oil, and more importantly, the ability to clean the crude oil. Determine if the...

AI Technical Summary

Problems solved by technology

Even with the development of science and technology, the sealing material has made great progress. By adopting new materials, the sealing performance of the piston has been greatly improved, and the error caused by poor sealing or deformation of the sealing ring has been reduced. The deformation is still very large for the error caused in the measurement of the compressibility coefficient of crude oil

[0010] 2. The compression chamber with variable-diameter structure in the latest compression device, considering the transmission of the pressure of the variable-diameter structure, under the premise of selecting a suitable slope, the compression chamber will be too long, and the piston pressure will not be easy to spread throughout the The compression chamber transfers, causing the pressure decay phenomenon

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