Horizontal well seam forming method and method for extracting oil gas from underground oil shale

Abstract

The invention relates to a horizontal well seam forming method and a method for extracting oil gas from an underground oil shale, and relates to technical field of petroleum extraction. The horizontal well seam forming method adopts fracturing fluid containing a microwave strong absorber to conduct fracturing seam forming, so that the microwave strong absorber can be uniformly distributed in the seam formed through fracturing by the method, and the utilization rate of microwave heating is increased. The method for extracting the oil gas from the underground oil shale comprises the steps that a horizontal well and a vertical production well are drilled in the oil shale layer; the horizontal well is subjected to fracturing seam forming through the fracturing fluid, and the fracturing fluid contains the microwave strong absorber; and microwave radiation is used for heating, so that the oil gas produced by kerogen pyrolysis is led out through the production well, and the heated efficiency of the oil shale and the extraction rate of shale oil are effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, and in particular to a method for creating fractures in horizontal wells and a method for exploiting oil and gas from underground oil shale. Background technique [0002] Oil shale, like oil sands and coalbed methane, is an unconventional oil and gas resource. Shale oil cannot be recovered only by drilling and pumping technology. It is necessary to closely combine oil shale and matrix minerals by heating. The solid organic matter (ie, kerogen) is converted into shale oil and produced. Currently, oil shale is exploited in two ways: open-pit mining and underground in-situ mining. Open-pit mining usually includes two parts: open-pit mining and ground low-temperature dry distillation heating. Although the technology is quite mature, it will produce a large amount of "three wastes" and cause great pollution to the environment. Underground in-situ mining refers to the method of directly heat...

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Problems solved by technology

[0003] At present, there are more than a dozen in-situ mining methods for oil shale in the world. Although the in-situ mining technologies represented by Shell's ICP technology, ExxonMobil's ExxonMobil technology and Chevron's Crush technology have an impact on the environment Small, but the heating speed is slow, the energy utilization rate is low, and the cost is high

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