Exploitation method of vaporizing formation water and displacing heavy oil by microwaves in situ

Abstract

The invention provides an exploitation method of vaporizing formation water and displacing heavy oil by microwaves in situ. The exploitation method comprises the following steps: selecting an old well in the heavy oil reservoir huff and puff old well area to serve as a displacement well, and selecting a plurality of old wells adjacent to the displacement well to serve as recovery wells, wherein the recovery wells form an injection and production well group; performing fracturing and crack construction on the target oil layer in the displacement well; injecting silicon carbide particles into the cracks; arranging microwave generating equipment at the wellhead and in the interior of the displacement well; and continuously performing microwave radiation heating on the silicon carbide particles through microwaves with certain power, and further heating the oil layer, so as to enable the underground stored water generated in the huff and puff process to be vaporized in situ, displace the crude oil of which the temperature is increased and the viscosity is reduced in the well, and enable the crude oil to enter the bottoms of the recovery wells to be exploited out. The exploitation method utilizes the silicon carbide particles in the cracks to heat the oil layer, so as to vaporize the underground stored water and displace the remaining oil after huff and puff, solve the problem of loss of steam quality due to steam injection at the wellhead, reduce heat loss, improve the downhole steam quality and steam swept volume at unit mass, and improve the exploitation effect of heavy oil reservoir after huff and puff.

Description

technical field [0001] The invention relates to a mining method for heavy oil reservoirs in the field of oil mining, in particular to a mining method for microwave in-situ vaporization of formation water and displacement of heavy oil. Background technique [0002] Heavy oil reservoirs refer to oil reservoirs with degassed crude oil viscosity greater than 100 centipoise at formation temperature, which are widely distributed in my country's Liaohe Oilfield, Xinjiang Tuha Oilfield, Karamay Oilfield, etc. The recovery is fast, so more than 80% of the heavy oil reservoirs in my country are developed by steam huff and puff in the initial stage of development. However, steam huff and puff technology is essentially an energy-depleted production method. As the number of huff and puff increases, the reservoir pressure drops rapidly. When the reservoir pressure is lower than 2MPa, the effective production time of continuous huff and puff is short, and the cycle oil-steam ratio and The ...

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Problems solved by technology

[0006] Another object of the present invention is to provide a mining method for microwave in-situ vaporization of formation water and displacement of heavy oil, using silicon carbide particle proppant in hydraulic fracturing fractures to efficiently transfer heat and reduce viscosity, quickly heat up oil layers, and vaporize underground water And displace the remaining oil after steam huff and puff, so as to solve the problem of steam dryness loss along the steam injection at the wellhead, reduce heat energy loss, and increase bottom-hole steam dryness and water vapor swept volume per unit mass

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