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

A quantitative evaluation and permeability technology, applied in the field of experimental equipment for oil exploitation, can solve the problems of lack of experimental verification of asphaltene deposition adsorption damage in heavy oil reservoirs, etc., and achieve the effect of simple overall structure, good experimental effect and convenient experimental operation

CN112014294APending Publication Date: 2020-12-01中海石油(中国)有限公司深圳分公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-12-01

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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.
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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...

Examples

Embodiment 1

[0044] like figure 1 As shown, this embodiment provides a quantitative evaluation device for rock permeability damage caused by crude oil asphaltenes, including a constant-speed constant-pressure micropump 1, a high-pressure formation oil container 2, a high-pressure kerosene container 3, a core holder 5, and a filter 6 and vacuum pump 9, wherein;

[0045]The constant speed and constant pressure micropump 1 is respectively connected to one end of the high-pressure formation oil container 2 and the high-pressure kerosene container 3, and the other end of the high-pressure formation oil container 2 is connected to the inlet of the core holder 5 through the back pressure valve a4-1. The valve a4-1 is used to apply pressure to the high-pressure formation oil container 2 to keep the pressure of the high-pressure formation oil container 2 above the formation pressure in situ. The other end of the high-pressure kerosene container 3 is connected to the inlet of the core holder 5, and ...

Embodiment 2

[0075] A quantitative evaluation device for rock permeability damage caused by crude oil asphaltene, the structure is as described in Example 1, the difference is that the core placed by the core holder is a cylindrical core with a diameter of 2.5 cm.