A drag reduction device and method for injecting foam into heavy oil in spiral slots

Abstract

The invention relates to a thick oil flowing resistance reducing device and method by injecting foam from a screw groove hole. The testing device consists of a foam resistance reducing unit, an air injecting unit and a water injecting unit which are skid-mounted, wherein a foam injector just needs to be mounted on a thick oil pipeline in a short connecting manner, and is fixed to an upper pipeline and a lower pipeline through screw connection. Gas phase-liquid phase fluid generates rich foam under the effect of rotary fluid guiding of a screw hole plate and fluid passage induced by a circular hole; the foam occupies the space of the thick oil pipeline close to an edge layer of the surface of the wall, and thick oil is forced to be separated from the wall of the pipe, so that the flow resistance in the pipeline is greatly reduced. The thick oil flowing resistance reducing device and method by injecting foam from the screw groove hole disclosed by the invention adopt a physical resistance reducing method, the purpose of flowing resistance reducing is realized without using chemical resistance-reducing agents and heating equipment, so that the environment is free from pollution. The thick oil flowing resistance reducing device disclosed by the invention is low in cost, safe and reliable, convenient to disassemble and assemble, and later stage changing and maintenance are convenient.

Description

technical field [0001] The invention relates to a flow drag reduction device and method for injecting foam into thick oil in spiral slot holes, belonging to the field of oil and gas gathering and transportation. Background technique [0002] The heavy oil in some oilfields in my country has a high content of colloid and asphaltene, and has the characteristics of high viscosity, high wax content, high freezing point, and poor fluidity, which makes the flow resistance relatively large during the transportation process, and often requires a high-power oil pump to pressurize or Heated transportation consumes more heat energy and kinetic energy, which increases the transportation cost. If there is a temporary suspension, the temperature of the heavy oil will gradually decrease. When the temperature drops below the wax precipitation point, a large number of wax crystals will precipitate, which not only greatly hinders the flow of the heavy oil, but also blocks the pipeline, resulti...

AI Technical Summary

Problems solved by technology

Since the viscosity of crude oil decreases with the increase of temperature, its viscosity can be reduced by heating. Generally, mines use water jacket furnace heating or electric heat tracing heating, which requires high equipment investment and consumes a lot of energy for operation.

Using heating and viscosity-reducing pipelines, if you want to start, you must first preheat the pipeline with other light oil products, and then feed heavy oil; if you want to stop the pipeline, you must also replace heavy oil with other light oil products, resulting in a certain amount of waste , and the process is complicated, the safety reliability and flexibility are not high

Dilution is mainly done by adding light oil or back-mixing hot sewage. Adding light oil to heavy oil has a great impact on the quality of heavy oil. It also requires a reliable source of light oil in the mine, and heating sewage not only consumes a lot of heat energy, but also requires Separation of water in heavy oil, increasing the process

Chemical drag reducers have certain toxicity and are easy to pollute the environment, and drag reducers are often not universal. Most drag reducers are acidic and have certain corrosion on pipelines

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