Dry wellhead development method and device suitable for medium-deepwater oil and gas field

The invention relates to a dry wellhead development method suitable for a medium-deepwater oil and gas field, which comprises the following steps that a production module is arranged on a deepwater jacket, and the production module is used for drilling and treating oil, gas and water; a Christmas tree is installed on a deck of the production module, and oil and gas exploitation and production through the dry type wellhead are achieved. The oil-gas field development cost can be greatly reduced on the premise of ensuring technical feasibility, facilitating later-stage production and adjustment operation and improving the recovery efficiency, the oil-gas field development benefits are improved, and oil-gas resources which cannot be economically developed at the water depth of 200-400 meters are activated. According to the dry-type wellhead oilfield development mode for the land slope area of the South China Sea, the ultra-deep water jacket platform and the dry-type wellhead are combined, the oil and gas field de