Multiphase flow hybrid conveying pipeline resistance reduction device and method of mine field

Abstract

The invention discloses a multiphase flow hybrid conveying pipeline resistance reduction device and a multiphase flow hybrid conveying pipeline resistance reduction method of a mine field. The multiphase flow hybrid conveying pipeline resistance reduction device and the multiphase flow hybrid conveying pipeline resistance reduction method are characterized in that: hybrid conveyed fluid is accelerated by a reducing pipe and then enters a device main body pipeline by a tangential inlet pipe; and an annular space between the device main body pipeline and a hot water reflow pipe forms a rotational flow. Due to different densities, oil phase, gas phase and water phase form layered circular flows in the device main body pipeline. The water phase is closely attached to the inner wall of the device main body pipeline, so that direct contact of oil with the pipe wall is avoided, and the conveying resistance is greatly reduced. The oil phase is positioned between the gas phase and the water phase and is driven by the gas phase and the water phase to be transferred towards downstream side. One end of the oil, gas and water three-phase hybrid conveying rotational flow resistance reduction device is connected with a hot water circulating system to heat the hybrid conveyed fluid, so that on one hand, the viscosity of crude oil in the hybrid conveyed pipe can be reduced, and on the other hand, gas can be expanded properly, and the air flow speed is increased. The multiphase flow hybrid conveying pipeline resistance reduction device and the multiphase flow hybrid conveying pipeline resistance reduction method have the advantages of adoption of a physical technology for resistance reduction, no toxicity, no pollution, low manufacturing cost, reliability in operation, good resistance reduction effect, capability of effectively preventing paraffin deposit and high promotion and application value.

Description

technical field [0001] The invention relates to a drag reduction device and method for a multiphase flow mixed transportation pipeline in a mine field by using physical technology to reduce resistance and increase transportation, and belongs to the field of oil and gas gathering and transportation. Background technique [0002] In order to save operating costs and reduce flow resistance to a certain extent, existing mine pipelines usually adopt the form of mixed transportation, which often presents oil-gas-water three-phase, oil-water two-phase or gas-water two-phase situation. However, the diameter of the mixed transportation pipeline is relatively large, and the mixed transportation components of each oilfield block are different, so the flow resistance is still relatively large. The current commonly used drag reduction method is mainly to add chemical drag reducers to the pipe to achieve the effect of drag reduction and viscosity reduction. However, most drag reducers hav...

AI Technical Summary

Problems solved by technology

However, the diameter of the mixed transportation pipeline is relatively large, and the mixed transportation components of each oilfield block are different, so the flow resistance is still relatively large

The current commonly used drag reduction method is mainly to add chemical drag reducers to the pipe to achieve the effect of drag reduction and viscosity reduction. However, most drag reducers have unstable performance and poor sustainability in the process of multi-phase mixed transportation. In addition, chemical drag reducers are toxic. , easy to pollute the environment, but also increase the difficulty of post-processing

[0003] In the case of crude oil with high wax content, high freezing point, and high viscosity, the friction resistance during transportation will be extremely large, which seriously affects the transportation efficiency. When the temperature drops to the wax precipitation point, the wax will gradually precipitate out, which not only increases the The energy consumption of the pipeline operation may also cause condensation accidents and affect the safe operation of the pipeline

When the mixed fluid is oil-water two-phase, an oil-water emulsion may be formed, which increases the flow viscosity, resulting in a serious drop in transmission efficiency

When the mixed fluid is mainly natural gas but contains a small amount of water phase, hydrates may form, causing blockage of pipelines, separation equipment and instruments

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