Well pattern structure, reservoir stimulation method and in-situ oil production method

Abstract

The invention discloses a well network structure, a reservoir reforming method and an in-situ oil extraction method. The well network structure comprises at least one horizontal well set, wherein thehorizontal well set comprises multiple horizontal wells for oil extraction, the horizontal section of each horizontal well is provided with multiple perforation sections, the horizontal well section of each horizontal well extends in the smallest horizontal main crustal stress direction, and the horizontal sections of the multiple horizontal wells are distributed in a regular polygon shape on thestratigraphic section. The geometric center of the regular polygon is provided with a heating well extending in the same direction as the horizontal wells, and microwave generators are installed in the heating well in the smallest horizontal main crustal stress direction at equal intervals. The perforation sections are within the most appropriate frequency acting range of the microwave generators.The well network structure can be used for reforming a reservoir, especially dense reservoirs such as oil shale, the permeability of the reservoir is improved, the reservoir is sufficiently and evenly heated to 371 DEG C or above, kerogen or immature organic matter in the reservoir is pyrolyzed in a large scale and converted into high-quality oil and gas, and finally the oil recovery rate and mining efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a well pattern structure, a reservoir reconstruction method and an in-situ oil recovery method. Background technique [0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art. [0003] Oil shale is a high-ash sedimentary rock containing a large amount of immature organic matter or kerogen, which can be converted into high-quality oil and gas for human use only through high-temperature cracking. Oil shale is rich in reserves in my country. Considering its deep reservoirs and the environmental pollution caused by retorting oil shale on the surface, it is an inevitable trend to exploit oil shale in situ. [0004] According to the different heating methods of oil shale layers, the current in-situ mining technologies of oil shale can be divided into three types: conduction heating, conv...

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Problems solved by technology

At present, the specific construction methods of these three types of oil shale in-situ mining technologies have a series of problems such as uneven heating of the reservoir, high energy consumption and pollution, high cost, poor permeability, and low recovery factor, which are difficult to apply to oil shale. Large-scale mining of rock resources

[0005] The applicant found that the temperature field formed in the reservoir by common heating technology is generally distributed in a spherical shape, and the loss is fast and large, and the internal heating effect of the reservoir is not ideal

Taking electrical conduction heating as an example, the heating effect is better only on the contact surface, and the heating effect on the inside of the reservoir is uneven and not significant

In addition, the existing heating technology for in-situ mining of oil shale only raises the temperature to crack oil shale into high-quality oil and gas, but cannot transform the reservoir and increase the permeability of the reservoir.

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