Japan Petroleum Exploration has filed a patent for a method of underground storage of injection gas containing CO2 gas and enhanced oil recovery. The method involves supplying injection water through a water flow path, jetting the injection water as a high-pressure water jet, suctioning an injection gas through a gas flow path, jetting the injection gas as fine bubbles, and performing underground storage of the injection gas by allowing a gas-liquid mixed fluid containing fine bubbles to penetrate into a permeable formation such as an oil reservoir. GlobalData’s report on Japan Petroleum Exploration gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Japan Petroleum Exploration, syngas production was a key innovation area identified from patents. Japan Petroleum Exploration's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Method of underground storage of injection gas and enhanced oil recovery
A recently filed patent (Publication Number: US20230134985A1) describes a method for underground storage of injection gas containing CO2 gas and enhanced oil recovery. The method involves using an injection well with two flow paths, one for water and one for gas, and a fine bubble-generating device placed at the lower ends of these paths.
The process begins by supplying injection water through the water flow path into the injection well. Then, a high-pressure water jet is created by narrowing the flow of the injection water through the fine bubble-generating device. This high-pressure water jet suctions the injection gas through the gas flow path into the fine bubble-generating device, where fine bubbles of the injection gas are mixed with the injection water. Finally, the gas-liquid mixed fluid, containing the fine bubbles generated by this mixing process, is allowed to penetrate into a permeable formation such as an oil reservoir.
The patent also mentions different placements for the fine bubble-generating device. Claim 2 states that the device can be placed in a wellhead, while claim 3 suggests placing it on the surface. This flexibility in placement allows for customization based on the specific requirements of the underground storage and enhanced oil recovery process.
Furthermore, claim 4 describes the structure of the two flow paths in the injection well. They have a double pipe structure, with an outer pipe and an inner pipe. The gas flow path is provided between the inner side of the outer pipe and the outer side of the inner pipe, while the water flow path is provided on the inner side of the inner pipe. The fine bubble-generating device is placed at the lower end of the outer pipe.
Overall, this patent presents a method for underground storage of injection gas containing CO2 gas and enhanced oil recovery. By utilizing a fine bubble-generating device and a specific flow path structure, the method aims to improve the efficiency and effectiveness of the injection process. The different placement options for the device offer flexibility in implementation, allowing for customization based on specific project requirements.
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