With the continuous advancement of oil extraction technology, oil and natural gas that were previously in the underground rock crevices have also been mined. The best way to extract oil and gas from rock crevices is to inject high-pressure water into underground rock because water is more important than oil. Heavy, oil and natural gas will be squeezed onto it to achieve the purpose of mining, but there is a technical problem in injecting water into the crevices of rock. That is, some rock gaps are too small, and high-pressure water cannot enter rock crevices. The technique of intervention with plastic pressure balls is simply to inject plastic pressure balls and water into the gaps of underground rocks, and to move small plastic crevices through the flow of plastic pressure balls.