Optimization method for determining proportion of mixing light oil into heavy oil of ultra-deep well and light hydrocarbon mixer thereof

Abstract

The invention discloses an optimization method for determining the proportion of mixing light oil into heavy oil of an ultra-deep well and a light oil mixer thereof. The method comprises the steps of: 1) establishing a multi-phase flow comprehensive pressure drop calculation model and a correction model; 2) deriving a calculation method for the temperature gradient of a fluid in a shaft of a light oil mixing well; 3) performing the multi-phase flow calculation of bent well sections of the ultra-deep well, and calculating the distribution rule of parameters in a borehole shape; 4) establishing an analysis model of production performance of mixing the light oil into the heavy oil; and 5) optimizing the proportion and production parameters of mixing the light oil into the heavy oil. The method realizes the simulation and analysis to the production performance of mixing the light oil into the heavy oil of the ultra-deep well. The production performance of mixing the light oil into the heavy oil of the ultra-deep well are quantificationally analyzed and simulated and the distribution rule of parameters such as pressure, density and velocity along the shaft can be obtained. The method can optimize the proportion and the production parameters of mixing the light oil into the heavy oil according to the productivity of an oil well. The optimum light oil mixing proportion and mixing pressure are preferably selected. The method and the mixer have extremely strong industrial applicability.

Description

【Technical field】 [0001] The invention relates to a heavy oil blending method and a tool thereof, in particular to an optimization method for determining the blending-lean ratio of heavy oil in an ultra-deep well and the use of a blending-lean blender. 【Background technique】 [0002] As we all know, taking measures to reduce viscosity is an effective means to recover heavy oil. These viscosity reduction measures include burning oil layer, steam stimulation, chemical viscosity reduction, electric heating, etc. In particular, heavy oil from ultra-deep wells has its particularities. Since the burial depth of the oil layer is more than 5000m, and the formation temperature is as high as 130°C, the crude oil has good fluidity in the reservoir. However, when the crude oil enters the wellbore and then flows to the surface, as the wellbore temperature decreases, the viscosity of the heavy oil increases and it will gradually lose its fluidity. Therefore, for the production of heavy...

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Problems solved by technology

However, when the crude oil enters the wellbore and then flows to the surface, as the temperature of the wellbore decreases, the viscosity of the heavy oil increases and it will gradually lose its fluidity.

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