Underground thermal fluid generation method and device based on multi-channel continuous pipe

Abstract

The invention relates to an underground hot fluid generation method and device based on a multi-channel coiled tubing, and the method comprises the steps: 1, sequentially connecting a multi-channel coiled tubing channel, a hot fluid generation device and a hot fluid conveying channel to form an integral device, and putting the integral device into a designated position in a shaft; secondly, the hot fluid generating device and the shaft are connected in a sealed mode through an annulus packing device, so that an upper annulus cavity and a lower annulus cavity are formed in the shaft; thirdly, a combustion improver, fuel and water are conveyed into the hot fluid generating device through a multi-channel continuous oil pipe channel, and multi-element hot fluid is generated in the hot fluid generating device through ignition; fourthly, the mixed fluid is input into the upper annular cavity, and the flow of the mixed fluid entering the lower annular cavity is adjusted through an annular packing device; and fifthly, the multi-element thermal fluid and the mixed fluid are mixed and injected into the target oil reservoir. The steam injection heat loss can be reduced, and the temperature and displacement of the multi-element thermal fluid can be adjusted.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development and exploitation, and in particular relates to a method and equipment for generating downhole thermal fluid based on a multi-channel coiled pipe. Background technique [0002] At present, heavy oil accounts for a large proportion of petroleum resources. Heavy oil has the characteristics of high viscosity, poor fluidity, high freezing point and very sensitive to temperature. The multi-component thermal fluid generator is developed for the thermal recovery of heavy oil in oilfields in recent years to generate water vapor, CO 2 , N 2 It is a ground device for high temperature and high pressure mixed fluid, which is mainly composed of a raw material supply system (ie, water, fuel, air, electricity, etc. supply devices) and a multi-component thermal fluid generating device (ie, ignition combustion device and water spray temperature control device, etc.) . Due to the small size...

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Problems solved by technology

[0003] However, with the increase of steam injection temperature, dryness and well depth, the process of surface multi-component thermal fluid injection from the wellhead to the oil layer will inevitably increase the heat loss and energy loss of steam injection, which will reduce the utilization rate of heat energy and cannot Achieving the expected increase in production

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