Supercritical water oxidation fluid injection production system using nitrogen as protective film and process using same

Abstract

The invention discloses a supercritical water oxidation fluid injection production system using nitrogen as a protective film. The injection-production system comprises an air separation plant, an air film reactor, a shaft and an injection pipeline disposed in the shaft. An oxygen outlet of the air separation plant is communicated with an oxygen inlet at the upper end of the air film reactor through an oxygen booster pump. A nitrogen outlet of the air separation plant is communicated with an upper nitrogen inlet, a lower nitrogen inlet and a gap between the shaft and the injection pipeline through a nitrogen booster pump. The upper nitrogen inlet and the lower nitrogen inlet are reserved on one side of the air film reactor. A fuel inlet and a water inlet which are communicated with a fuel device and a water booster heating device respectively are reserved at the upper end of the air film reactor. An outlet which is communicated with the injection pipeline is reserved at the lower end of the air film reactor. The invention further discloses an injection-production process using the system. Oxygen is used as oxidant and the nitrogen is used as a protective film of the reactor and the shaft, fuel is oxidized through supercritical water, generated multiple thermal fluids are injected into an oil well, and accordingly, viscosity of thickened oil is lowered and oil recovery rate is enhanced.

Description

[0001] technical field [0002] The invention relates to the fields of energy and environment, in particular to a supercritical water oxidation fluid injection and production system using nitrogen as a protective film and a process thereof. Background technique [0003] Reducing costs and maximizing the extraction of heavy oil and super heavy oil are common issues facing the oil industry in the world today. Due to the high viscosity of heavy oil, it brings great difficulties to mining, gathering and processing. Thermal oil recovery by steam injection is an effective means to develop heavy oil reservoirs. The law of steam injection huff and puff is that the oil production reaches its peak in the fourth and fifth cycle, and then with the increase of the huff and puff cycle, the oil production in each cycle gradually decreases, the comprehensive water cut increases, and the production effect becomes worse day by day. The main reason for the poor production effect after multip...

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Problems solved by technology

[0007] However, the supercritical water oxidation reaction conditions are harsh. Under the conditions of high temperature, high pressure and oxygen, the reactor wall will be corroded; in addition, supercritical water is a non-polar solvent, and the solubility of inorganic salts in supercritical water will drop sharply. , thus forming the precipitation of inorganic salts, causing blockage of the reactor or system piping in severe cases

Therefore, the problems of corrosion and clogging have become bottlenecks restricting the development of supercritical water oxidation technology.

As a method that can simultaneously solve the two major problems of corrosion and salt deposition in the process of supercritical water oxidation technology, the water film reactor has attracted the attention of scholars at home and abroad in recent years, and has achieved certain results. However, deionization in oil fields The difficulty of obtaining water and the high cost make it difficult to use it in supercritical water oxidation fluid injection and production process on a large scale

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