Method for reducing viscosity of crude oil with low-cost

Abstract

The invention discloses a low-cost base-oil viscosity reducing method by injecting arene solvent into the base oil by the routine method, the volume ratio of the arene solvent to the base oil equal to 0.1-3% and the arene solvent preferentially selects any one or above combination of benzene, toluene and xylene solvents. It does not need complex injecting facility and processing technique.

Description

technical field [0001] The invention relates to a low-cost method for reducing the viscosity of crude oil, which is mainly used in the fields of crude oil transportation, storage, and re-exploitation to improve the crude oil transportation volume or crude oil re-exploitation output. Background technique [0002] Most of the crude oil extracted from the oil field needs to be transported to a distant transshipment site or refinery through oil pipelines, during which pressure, heating, and heat preservation are required to maintain the fluidity of the crude oil. Due to the increasing dependence of the world economy on crude oil, the demand for crude oil is also increasing, and many crude oil pipelines have reached full capacity. In order to further improve the efficiency of crude oil transported by these pipelines, the methods currently used are mainly to add pour point depressants, drag reducers, and anti-wax precipitation agents to pipeline crude oil to impro...

AI Technical Summary

Problems solved by technology

[0004] First, since the main components of this type of drag reducer are ultra-high molecular weight long-chain hydrocarbons or alcohols, the actual use proves that its ability to resist shearing is very poor. Places with strong shear force such as elbows and elbows will destroy the effect of drag reducer

Therefore, at present, all such drag reducers can only work in the inter-station pipeline section of crude oil transportation. If the entire oil pipeline adopts the transportation process of adding such drag reducers, it is necessary to add drag reducers at the exit of each station , that is, if there is a bottleneck point that affects the flow of crude oil on more than one pipe section, it is necessary to inject drag reducer at multiple points, which makes the operation extremely complicated and the cost increases

[0005] Second, due to the poor shear resistance of such drag reducers, they must be injected at high pressure in the transmission pipeline behind the pumping station, which will inevitably lead to the need for expensive, special, dedicated low-shear equipment. Refueling not only further increases the cost of crude oil transportation, but also these special equipment are extremely inconvenient to use

[0006] Third, since this type of drag reducer can only be effective in the state of turbulent flow of crude oil, it will not work in the state of laminar flow of crude oil, so its application is also limited by the operating state of pipeline transportation of crude oil

Experiments so far have shown that the drag reduction efficiency of these drag reducers for highly viscous and condensable crude oil that is not easy to form a turbulent state is sharply reduced, and basically does not work for crude oil with high wax content or high water content