Fluid jet principle is used in many processes. This paper introduces four patented new technologies developed based on fluid jet principle for oil field development. They are the methods of removal of formation plug, spent-acid flow-back by pressure decrease on one-trip, wellhead adding water, and removal of sludge from settling tank. The applications in more than 200 wells (or sets) show that these fluid jet new technologies have great prospects in oilfield production with their simplicity of technological process, convenient operation and low cost. This-paper describes mainly the technical principles, field utilization results and features of them.