Production-reduction-free pipe cleaning method for multi-branch natural gas gathering and transportation pipeline

The invention discloses a production-reduction-free pipe cleaning method for a multi-branch natural gas gathering and transportation pipeline, and the method specifically comprises the following steps: 1, predicting the speed of a pipe cleaner according to the gas transportation amount of the pipeline, and obtaining the instantaneous speed of the pipe cleaner according to an instantaneous speed calculation formula during the operation of the pipe cleaner; 2, according to the instantaneous speed, obtained in the step 1, of the pipe cleaner, if the instantaneous speed of the pipe cleaner is smaller than or equal to 7 m/s, a conventional pipe cleaning method is selected, and if the instantaneous speed of the pipe cleaner is larger than 7 m/s, the natural gas gathering and transportation pipeline is cleaned according to the following step 3; and 3, the natural gas gathering and transportation pipeline is cleaned through integration of the pipe cleaner root jet technology and the automatic pressure relief technolo