Deepwater shallow gas hydrate multi-layer combined production drilling fluid system and hydrate inhibition performance regulation and control method

The invention relates to a deepwater shallow gas hydrate multi-layer combined production drilling fluid system and a hydrate inhibition performance regulation and control method, and belongs to the technical field of natural gas hydrate production. The drilling fluid system comprises the following components: seawater-based liquid, sodium hydroxide, a filtrate reducer, a tackifying coating agent, xanthan gum, polyamine, a balling-preventing lubricant, potassium chloride, sodium chloride, a reservoir bridge plugging agent, a modified resin plugging agent, a hydrate generation inhibitor and a hydrate decomposition inhibitor. Judging whether the natural gas hydrate is generated and decomposed or not according to the generation and decomposition inhibition performance of the drilling fluid system on the natural gas hydrate; when a horizontal complex well is drilled in the deepwater weakly cemented formation, the method has the advantages that the working efficiency is improved, the well control risk is reduced, t