Quantitative evaluation device for rock permeability damage caused by crude oil asphaltene and application of quantitative evaluation device

Abstract

The invention relates to a quantitative evaluation device for rock permeability damage caused by crude oil asphaltene and application of the quantitative evaluation device, and belongs to the technical field of experimental equipment for oil exploitation. The device comprises a constant-speed constant-pressure micro pump, a high-pressure formation oil container, a high-pressure kerosene container,a rock core holder, a filter and a vacuum pump, wherein the constant-speed constant-pressure micro pump is connected with one end of the high-pressure formation oil container and one end of the high-pressure kerosene container, the other end of the high-pressure formation oil container is connected with an inlet of the rock core holder through a back pressure valve a; the other end of the high-pressure kerosene container is connected to an inlet of the rock core holder; an outlet of the core holder is connected with the filter and the vacuum pump; the filter is connected to a back pressure valve b; the back pressure valve a and the rock core holder are connected with a hand pump a; and the back pressure valve b is connected with a hand pump b. According to the present invention, the rockpermeability change amount caused by crude oil asphaltene precipitation and the adsorption amount of asphaltene in the rock core can be measured under the stratum temperature condition, and the experimental data support is provided for evaluation of heavy oil reservoir damage caused by asphaltene deposition.

Description

technical field [0001] The invention relates to a quantitative evaluation device for rock permeability damage caused by crude oil asphaltenes and an application thereof, belonging to the technical field of experimental equipment for oil exploitation. Background technique [0002] Asphaltenes refer to components in crude oil that are soluble in toluene and insoluble in n-heptane. Asphaltene has a complex structure, strong polarity and high molecular weight (7000-10000), and its chemical structure is difficult to determine. Crude oil is a relatively stable colloidal dispersion system, and its dispersed phase is a micelle composed of asphaltene as the core and the colloid attached to it as the solvation layer, while the dispersion medium is mainly composed of oil molecules and some colloids of. The asphaltene molecules in the micelles are associated with the colloid molecules by forces such as adsorption and hydrogen bonds. Colloids play an important role in the stability of...

AI Technical Summary

Problems solved by technology

This method uses digital core technology to simulate the adsorption damage of asphaltene deposition in heavy oil reservoirs, but lacks the experimental verification of asphaltene deposition adsorption damage in heavy oil reservoirs

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