Compact reservoir oil shale in-situ mining turbulence effect process construction system and method

Abstract

The invention discloses a compact reservoir oil shale in-situ mining turbulence effect process construction system and method, and belongs to the field of oil shale in-situ mining. The construction system comprises a grouting packing system, a well pattern system and a heating system; the grouting packing system comprises a grouting packing area, and the grouting packing area is a closed area formed at a boundary of an oil shale in-situ mining area by adopting a grouting construction method; the well pattern system is arranged in the grouting packing area, and the well pattern system is composed of a heat injection well pattern and a slim hole well pattern; and the heating system comprises a heat injection well head, a packer, coiled tubing and a downhole heater. A staged fracturing hydraulic fracturing mode is adopted, heat convection heating is achieved between two vertical shafts, the heat flow directions of heat injection boundary layers of the two vertical shafts are opposite, theporosity and permeability of oil shale in a middle heating stage are improved, turbulent flow fields are formed in an upper-stage fractured oil shale layer and a lower-stage fractured oil shale layer, the heat transfer effect is further improved, therefore the construction and process period is shortened, and the recovery rate is increased.

Description

technical field [0001] The invention belongs to the field of in-situ mining of oil shale, and in particular relates to a turbulence effect process construction system and method for in-situ mining of oil shale in tight reservoirs. Background technique [0002] With the increasing exploration of unconventional energy resources such as oil shale, oil sands, coal bed methane and shale gas in recent years, the proven reserves of unconventional energy resources are gradually increasing, and the prospect of mining and application is broad. [0003] In-situ mining technology, also known as underground in-situ conversion technology, realizes the exploitation of oil shale in the target interval by injecting heat on the ground or underground. Reservoir reconstruction is realized through hydraulic fracturing or acidizing technology in the target interval. The heat medium injects heat into the oil shale in the target interval through heat conduction and heat convection. When the keroge...

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Problems solved by technology

These disadvantages have made the on-site construction of these in-situ mining processes difficult, and it is difficult to further commercially exploit unconventional tight reservoirs.

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