Oil and gas reservoir permeation-increasing and plugging-releasing device based on liquid-electric effect

Abstract

The invention discloses an oil and gas reservoir permeation-increasing and plugging-releasing device based on a liquid-electric effect. The device includes a ground charging device which configured to transmit electric power to a downhole, a downhole device which is configured to store electric energy delivered by the ground charging device and capable of generating the liquid-electric effect to produce shock waves, and at least a downhole shock wave generating device, wherein the downhole shock wave generating device comprises a downhole variable pressure energy storage device and downhole electrodes, and is configured to lower the transmission voltage of the ground charging device to a charge voltage and then store the electric energy delivered by the ground charging device, accordingly, the charging voltage can be instantly increased by several times before being loaded to the downhole electrode to allow the downhole electrodes to generate the liquid-electric effect. The device is based on the electric spark explosion formed by the liquid-electric effect between downhole electrodes, and the periodic impact waves are excited to the surrounding strata, therefore, formation conditions can be improved, an oil permeation channel can be quickly dredged, and permeability of an oil well can be improved.

Description

technical field [0001] The invention relates to oil well plugging removal technology, in particular to a device for increasing permeability and removing plugging of oil and gas reservoirs based on hydroelectric effect. Background technique [0002] With the increase of oil well recovery time, the oil outlet holes of many oil wells are blocked due to the accumulation of impurities and long-term injection of polymers, resulting in blockage of oil seepage channels, increased bottom-hole pressure, and a decline in the effect of polymer injection, resulting in a decrease in oil well production, and even some discontinued. [0003] The existing plugging removal methods include physical plugging removal, chemical plugging removal and biological plugging removal, etc.; the construction steps of the physical plugging removal method are relatively cumbersome, and the chemical plugging removal method has high cost and short effective period of plugging removal, which causes secondary d...

AI Technical Summary

Problems solved by technology

[0002] With the increase of oil well recovery time, the oil outlet holes of many oil wells are blocked due to the accumulation of impurities and long-term injection of polymers, resulting in blockage of oil seepage channels, increased bottom hole pressure, and decreased effect of polymer injection, resulting in reduced oil well production, and even some discontinued

[0003] The existing plugging removal methods include physical plugging removal, chemical plugging removal and biological plugging removal, etc.; the construction steps of the physical plugging removal method are relatively cumbersome, and the chemical plugging removal method has high cost and short effective period of plugging removal, which causes secondary damage to the oil well and is easy to Causes prominent problems such as environmental pollution, the biological plugging removal method has high requirements on the environment, and the technology is not mature enough

[0004] The invention patent application document of China University of Petroleum (East China) with the patent number 201510172608.7 discloses a device for increasing permeability and plugging removal of oil and gas reservoirs and a method for increasing permeability and plugging removal, using the jet impact pressure and temperature difference stress of the carbon dioxide fluid acting on the formation Create cracks in the well wall rock to achieve the purpose of increasing permeability and removing plugging; this method of plugging removal is costly and easy to cause damage to the formation

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