A method of in-situ heating and mining oil shale with microwave step-down

Abstract

A method for in-situ heating and exploitation of oil shale by microwave step-down heating, comprising the following steps: (1) setting a microwave heating well on the oil shale ore layer, and the microwave heating well is located at the center of the oil-gas outlet fracture; (2) When the temperature sensor monitors that the temperature of the microwave heating well reaches the upper limit, the microwave power is reduced stepwise, so that the oil shale deposit is radiated and heated, so that the generated oil and gas are exported through the oil and gas outlet fractures. The method adopts the heating mode of step-down microwave heating oil shale, which not only utilizes the advantage of easy control of microwave power, but also is a high-efficiency heating method with higher efficiency than the intermittent microwave heating mode.

Description

technical field

[0001] The invention relates to the technical field of in-situ oil shale exploitation, in particular to a microwave step-down in-situ heating extraction method for oil shale. Background technique

[0002] Oil shale is a kind of unconventional oil and gas resources. The organic kerogen contained in it needs to be converted into gas-liquid hydrocarbons by heating, which can be used as a substitute for conventional crude oil. The in-situ mining of oil shale can overcome the environmental pollution caused by open-pit mining and the problems of narrow mining range. Microwave heating has been proposed as an in-situ oil shale mining method due to its high heating efficiency, selective heating, and volumetric heating.

[0003] At present, in the theory and technology of in-situ mining of oil shale by microwave heating, most of them assume that microwave heating of oil shale formation is continuous heating with constant power, and little attention is paid to the infl...

Examples

Embodiment 1

[0031] A method for in-situ heating and exploitation of oil shale by microwave step-down, comprising the following steps:

[0032] (1) A microwave heating well is set on the oil shale ore layer, and the microwave heating well is located at the center of the oil and gas outlet fracture;

[0033] (2) Set the upper limit value of the temperature sensor to 700°C, turn on the microwave source through the control room, the power of the microwave source is 800W, and continuously radiate the formation for 45 days. When the monitoring temperature reaches 680°C, reduce the power to 700W at this time , continue to radiate for 29 days, and the monitoring temperature reaches 678°C; at this time, reduce the power to 500W, and continue to radiate for 140 days, when the monitoring temperature reaches 679°C; at this time, reduce the power to 350W, continue to radiate the formation for 126 days, and then monitor The temperature reaches 656° C. (see Table 1 for specific steps).

[0034] Assumin...

technical field

[0001] The invention relates to the technical field of in-situ oil shale exploitation, in particular to a microwave step-down in-situ heating extraction method for oil shale. Background technique

[0002] Oil shale is a kind of unconventional oil and gas resources. The organic kerogen contained in it needs to be converted into gas-liquid hydrocarbons by heating, which can be used as a substitute for conventional crude oil. The in-situ mining of oil shale can overcome the environmental pollution caused by open-pit mining and the problems of narrow mining range. Microwave heating has been proposed as an in-situ oil shale mining method due to its high heating efficiency, selective heating, and volumetric heating.

[0003] At present, in the theory and technology of in-situ mining of oil shale by microwave heating, most of them assume that microwave heating of oil shale formation is continuous heating with constant power, and little attention is paid to the infl...

Examples

Embodiment 1

[0031] A method for in-situ heating and exploitation of oil shale by microwave step-down, comprising the following steps:

[0032] (1) A microwave heating well is set on the oil shale ore layer, and the microwave heating well is located at the center of the oil and gas outlet fracture;

[0033] (2) Set the upper limit value of the temperature sensor to 700°C, turn on the microwave source through the control room, the power of the microwave source is 800W, and continuously radiate the formation for 45 days. When the monitoring temperature reaches 680°C, reduce the power to 700W at this time , continue to radiate for 29 days, and the monitoring temperature reaches 678°C; at this time, reduce the power to 500W, and continue to radiate for 140 days, when the monitoring temperature reaches 679°C; at this time, reduce the power to 350W, continue to radiate the formation for 126 days, and then monitor The temperature reaches 656° C. (see Table 1 for specific steps).

[0034] Assumin...

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